Imported Upstream version 1.7.0upstream/1.7.0

1 files changed, 3287 insertions, 0 deletions

diff --git a/ccast/chan/protobuf-c.c b/ccast/chan/protobuf-c.c
new file mode 100644
index 0000000..1157d8b
--- /dev/null
+++ b/ccast/chan/protobuf-c.c
@@ -0,0 +1,3287 @@
+/*
+ * Copyright (c) 2008-2014, Dave Benson and the protobuf-c authors.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*! \file
+ * Support library for `protoc-c` generated code.
+ *
+ * This file implements the public API used by the code generated
+ * by `protoc-c`.
+ *
+ * \authors Dave Benson and the protobuf-c authors
+ *
+ * \copyright 2008-2014. Licensed under the terms of the [BSD-2-Clause] license.
+ */
+
+/**
+ * \todo 64-BIT OPTIMIZATION: certain implementations use 32-bit math
+ * even on 64-bit platforms (uint64_size, uint64_pack, parse_uint64).
+ *
+ * \todo Use size_t consistently.
+ */
+
+#include <stdlib.h>	/* for malloc, free */
+#include <string.h>	/* for strcmp, strlen, memcpy, memmove, memset */
+
+#include "protobuf-c.h"
+
+#define TRUE				1
+#define FALSE				0
+
+#define PROTOBUF_C__ASSERT_NOT_REACHED() assert(0)
+
+/* VC6 doesn't support inline */
+#define inline
+
+/**
+ * \defgroup internal Internal functions and macros
+ *
+ * These are not exported by the library but are useful to developers working
+ * on `libprotobuf-c` itself.
+ */
+
+/**
+ * \defgroup macros Utility macros for manipulating structures
+ *
+ * Macros and constants used to manipulate the base "classes" generated by
+ * `protobuf-c`. They also define limits and check correctness.
+ *
+ * \ingroup internal
+ * @{
+ */
+
+/** The maximum length of a 64-bit integer in varint encoding. */
+#define MAX_UINT64_ENCODED_SIZE		10
+
+#ifndef PROTOBUF_C_UNPACK_ERROR
+# define PROTOBUF_C_UNPACK_ERROR(xxx)
+#endif
+
+/**
+ * Internal `ProtobufCMessage` manipulation macro.
+ *
+ * Base macro for manipulating a `ProtobufCMessage`. Used by STRUCT_MEMBER() and
+ * STRUCT_MEMBER_PTR().
+ */
+#define STRUCT_MEMBER_P(struct_p, struct_offset) \
+    ((void *) ((uint8_t *) (struct_p) + (struct_offset)))
+
+/**
+ * Return field in a `ProtobufCMessage` based on offset.
+ *
+ * Take a pointer to a `ProtobufCMessage` and find the field at the offset.
+ * Cast it to the passed type.
+ */
+#define STRUCT_MEMBER(member_type, struct_p, struct_offset) \
+    (*(member_type *) STRUCT_MEMBER_P((struct_p), (struct_offset)))
+
+/**
+ * Return field in a `ProtobufCMessage` based on offset.
+ *
+ * Take a pointer to a `ProtobufCMessage` and find the field at the offset. Cast
+ * it to a pointer to the passed type.
+ */
+#define STRUCT_MEMBER_PTR(member_type, struct_p, struct_offset) \
+    ((member_type *) STRUCT_MEMBER_P((struct_p), (struct_offset)))
+
+/* Assertions for magic numbers. */
+
+#define ASSERT_IS_ENUM_DESCRIPTOR(desc) \
+	assert((desc)->magic == PROTOBUF_C__ENUM_DESCRIPTOR_MAGIC)
+
+#define ASSERT_IS_MESSAGE_DESCRIPTOR(desc) \
+	assert((desc)->magic == PROTOBUF_C__MESSAGE_DESCRIPTOR_MAGIC)
+
+#define ASSERT_IS_MESSAGE(message) \
+	ASSERT_IS_MESSAGE_DESCRIPTOR((message)->descriptor)
+
+#define ASSERT_IS_SERVICE_DESCRIPTOR(desc) \
+	assert((desc)->magic == PROTOBUF_C__SERVICE_DESCRIPTOR_MAGIC)
+
+/**@}*/
+
+/* --- version --- */
+
+const char *
+protobuf_c_version(void)
+{
+	return PROTOBUF_C_VERSION;
+}
+
+uint32_t
+protobuf_c_version_number(void)
+{
+	return PROTOBUF_C_VERSION_NUMBER;
+}
+
+/* --- allocator --- */
+
+static void *
+system_alloc(void *allocator_data, size_t size)
+{
+	return malloc(size);
+}
+
+static void
+system_free(void *allocator_data, void *data)
+{
+	free(data);
+}
+
+static inline void *
+do_alloc(ProtobufCAllocator *allocator, size_t size)
+{
+	return allocator->alloc(allocator->allocator_data, size);
+}
+
+static inline void
+do_free(ProtobufCAllocator *allocator, void *data)
+{
+	if (data != NULL)
+		allocator->free(allocator->allocator_data, data);
+}
+
+/*
+ * This allocator uses the system's malloc() and free(). It is the default
+ * allocator used if NULL is passed as the ProtobufCAllocator to an exported
+ * function.
+ */
+static ProtobufCAllocator protobuf_c__allocator = {
+#ifdef NEVER
+	.alloc = &system_alloc,
+	.free = &system_free,
+	.allocator_data = NULL,
+#else
+	&system_alloc,
+	&system_free,
+	NULL
+#endif
+};
+
+/* === buffer-simple === */
+
+void
+protobuf_c_buffer_simple_append(ProtobufCBuffer *buffer,
+				size_t len, const uint8_t *data)
+{
+	ProtobufCBufferSimple *simp = (ProtobufCBufferSimple *) buffer;
+	size_t new_len = simp->len + len;
+
+	if (new_len > simp->alloced) {
+		ProtobufCAllocator *allocator = simp->allocator;
+		size_t new_alloced = simp->alloced * 2;
+		uint8_t *new_data;
+
+		if (allocator == NULL)
+			allocator = &protobuf_c__allocator;
+		while (new_alloced < new_len)
+			new_alloced += new_alloced;
+		new_data = do_alloc(allocator, new_alloced);
+		if (!new_data)
+			return;
+		memcpy(new_data, simp->data, simp->len);
+		if (simp->must_free_data)
+			do_free(allocator, simp->data);
+		else
+			simp->must_free_data = TRUE;
+		simp->data = new_data;
+		simp->alloced = new_alloced;
+	}
+	memcpy(simp->data + simp->len, data, len);
+	simp->len = new_len;
+}
+
+/**
+ * \defgroup packedsz protobuf_c_message_get_packed_size() implementation
+ *
+ * Routines mainly used by protobuf_c_message_get_packed_size().
+ *
+ * \ingroup internal
+ * @{
+ */
+
+/**
+ * Return the number of bytes required to store the tag for the field. Includes
+ * 3 bits for the wire-type, and a single bit that denotes the end-of-tag.
+ *
+ * \param number
+ *      Field tag to encode.
+ * \return
+ *      Number of bytes required.
+ */
+static inline size_t
+get_tag_size(unsigned number)
+{
+	if (number < (1 << 4)) {
+		return 1;
+	} else if (number < (1 << 11)) {
+		return 2;
+	} else if (number < (1 << 18)) {
+		return 3;
+	} else if (number < (1 << 25)) {
+		return 4;
+	} else {
+		return 5;
+	}
+}
+
+/**
+ * Return the number of bytes required to store a variable-length unsigned
+ * 32-bit integer in base-128 varint encoding.
+ *
+ * \param v
+ *      Value to encode.
+ * \return
+ *      Number of bytes required.
+ */
+static inline size_t
+uint32_size(uint32_t v)
+{
+	if (v < (1 << 7)) {
+		return 1;
+	} else if (v < (1 << 14)) {
+		return 2;
+	} else if (v < (1 << 21)) {
+		return 3;
+	} else if (v < (1 << 28)) {
+		return 4;
+	} else {
+		return 5;
+	}
+}
+
+/**
+ * Return the number of bytes required to store a variable-length signed 32-bit
+ * integer in base-128 varint encoding.
+ *
+ * \param v
+ *      Value to encode.
+ * \return
+ *      Number of bytes required.
+ */
+static inline size_t
+int32_size(int32_t v)
+{
+	if (v < 0) {
+		return 10;
+	} else if (v < (1 << 7)) {
+		return 1;
+	} else if (v < (1 << 14)) {
+		return 2;
+	} else if (v < (1 << 21)) {
+		return 3;
+	} else if (v < (1 << 28)) {
+		return 4;
+	} else {
+		return 5;
+	}
+}
+
+/**
+ * Return the ZigZag-encoded 32-bit unsigned integer form of a 32-bit signed
+ * integer.
+ *
+ * \param v
+ *      Value to encode.
+ * \return
+ *      ZigZag encoded integer.
+ */
+static inline uint32_t
+zigzag32(int32_t v)
+{
+	if (v < 0)
+		return ((uint32_t) (-v)) * 2 - 1;
+	else
+		return v * 2;
+}
+
+/**
+ * Return the number of bytes required to store a signed 32-bit integer,
+ * converted to an unsigned 32-bit integer with ZigZag encoding, using base-128
+ * varint encoding.
+ *
+ * \param v
+ *      Value to encode.
+ * \return
+ *      Number of bytes required.
+ */
+static inline size_t
+sint32_size(int32_t v)
+{
+	return uint32_size(zigzag32(v));
+}
+
+/**
+ * Return the number of bytes required to store a 64-bit unsigned integer in
+ * base-128 varint encoding.
+ *
+ * \param v
+ *      Value to encode.
+ * \return
+ *      Number of bytes required.
+ */
+static inline size_t
+uint64_size(uint64_t v)
+{
+	uint32_t upper_v = (uint32_t) (v >> 32);
+
+	if (upper_v == 0) {
+		return uint32_size((uint32_t) v);
+	} else if (upper_v < (1 << 3)) {
+		return 5;
+	} else if (upper_v < (1 << 10)) {
+		return 6;
+	} else if (upper_v < (1 << 17)) {
+		return 7;
+	} else if (upper_v < (1 << 24)) {
+		return 8;
+	} else if (upper_v < (1U << 31)) {
+		return 9;
+	} else {
+		return 10;
+	}
+}
+
+/**
+ * Return the ZigZag-encoded 64-bit unsigned integer form of a 64-bit signed
+ * integer.
+ *
+ * \param v
+ *      Value to encode.
+ * \return
+ *      ZigZag encoded integer.
+ */
+static inline uint64_t
+zigzag64(int64_t v)
+{
+	if (v < 0)
+		return ((uint64_t) (-v)) * 2 - 1;
+	else
+		return v * 2;
+}
+
+/**
+ * Return the number of bytes required to store a signed 64-bit integer,
+ * converted to an unsigned 64-bit integer with ZigZag encoding, using base-128
+ * varint encoding.
+ *
+ * \param v
+ *      Value to encode.
+ * \return
+ *      Number of bytes required.
+ */
+static inline size_t
+sint64_size(int64_t v)
+{
+	return uint64_size(zigzag64(v));
+}
+
+/**
+ * Calculate the serialized size of a single required message field, including
+ * the space needed by the preceding tag.
+ *
+ * \param field
+ *      Field descriptor for member.
+ * \param member
+ *      Field to encode.
+ * \return
+ *      Number of bytes required.
+ */
+static size_t
+required_field_get_packed_size(const ProtobufCFieldDescriptor *field,
+			       const void *member)
+{
+	size_t rv = get_tag_size(field->id);
+
+	switch (field->type) {
+	case PROTOBUF_C_TYPE_SINT32:
+		return rv + sint32_size(*(const int32_t *) member);
+	case PROTOBUF_C_TYPE_INT32:
+		return rv + int32_size(*(const uint32_t *) member);
+	case PROTOBUF_C_TYPE_UINT32:
+		return rv + uint32_size(*(const uint32_t *) member);
+	case PROTOBUF_C_TYPE_SINT64:
+		return rv + sint64_size(*(const int64_t *) member);
+	case PROTOBUF_C_TYPE_INT64:
+	case PROTOBUF_C_TYPE_UINT64:
+		return rv + uint64_size(*(const uint64_t *) member);
+	case PROTOBUF_C_TYPE_SFIXED32:
+	case PROTOBUF_C_TYPE_FIXED32:
+		return rv + 4;
+	case PROTOBUF_C_TYPE_SFIXED64:
+	case PROTOBUF_C_TYPE_FIXED64:
+		return rv + 8;
+	case PROTOBUF_C_TYPE_BOOL:
+		return rv + 1;
+	case PROTOBUF_C_TYPE_FLOAT:
+		return rv + 4;
+	case PROTOBUF_C_TYPE_DOUBLE:
+		return rv + 8;
+	case PROTOBUF_C_TYPE_ENUM:
+		/* \todo Is this correct for negative-valued enums? */
+		return rv + uint32_size(*(const uint32_t *) member);
+	case PROTOBUF_C_TYPE_STRING: {
+		const char *str = *(char * const *) member;
+		size_t len = str ? strlen(str) : 0;
+		return rv + uint32_size(len) + len;
+	}
+	case PROTOBUF_C_TYPE_BYTES: {
+		size_t len = ((const ProtobufCBinaryData *) member)->len;
+		return rv + uint32_size(len) + len;
+	}
+	case PROTOBUF_C_TYPE_MESSAGE: {
+		const ProtobufCMessage *msg = *(ProtobufCMessage * const *) member;
+		size_t subrv = msg ? protobuf_c_message_get_packed_size(msg) : 0;
+		return rv + uint32_size(subrv) + subrv;
+	}
+	}
+	PROTOBUF_C__ASSERT_NOT_REACHED();
+	return 0;
+}
+
+/**
+ * Calculate the serialized size of a single optional message field, including
+ * the space needed by the preceding tag. Returns 0 if the optional field isn't
+ * set.
+ *
+ * \param field
+ *      Field descriptor for member.
+ * \param has
+ *      True if the field exists, false if not.
+ * \param member
+ *      Field to encode.
+ * \return
+ *      Number of bytes required.
+ */
+static size_t
+optional_field_get_packed_size(const ProtobufCFieldDescriptor *field,
+			       const protobuf_c_boolean *has,
+			       const void *member)
+{
+	if (field->type == PROTOBUF_C_TYPE_MESSAGE ||
+	    field->type == PROTOBUF_C_TYPE_STRING)
+	{
+		const void *ptr = *(const void * const *) member;
+		if (ptr == NULL || ptr == field->default_value)
+			return 0;
+	} else {
+		if (!*has)
+			return 0;
+	}
+	return required_field_get_packed_size(field, member);
+}
+
+/**
+ * Calculate the serialized size of repeated message fields, which may consist
+ * of any number of values (including 0). Includes the space needed by the
+ * preceding tags (as needed).
+ *
+ * \param field
+ *      Field descriptor for member.
+ * \param count
+ *      Number of repeated field members.
+ * \param member
+ *      Field to encode.
+ * \return
+ *      Number of bytes required.
+ */
+static size_t
+repeated_field_get_packed_size(const ProtobufCFieldDescriptor *field,
+			       size_t count, const void *member)
+{
+	size_t header_size;
+	size_t rv = 0;
+	unsigned i;
+	void *array = *(void * const *) member;
+
+	if (count == 0)
+		return 0;
+	header_size = get_tag_size(field->id);
+	if (0 == (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED))
+		header_size *= count;
+
+	switch (field->type) {
+	case PROTOBUF_C_TYPE_SINT32:
+		for (i = 0; i < count; i++)
+			rv += sint32_size(((int32_t *) array)[i]);
+		break;
+	case PROTOBUF_C_TYPE_INT32:
+		for (i = 0; i < count; i++)
+			rv += int32_size(((uint32_t *) array)[i]);
+		break;
+	case PROTOBUF_C_TYPE_UINT32:
+	case PROTOBUF_C_TYPE_ENUM:
+		for (i = 0; i < count; i++)
+			rv += uint32_size(((uint32_t *) array)[i]);
+		break;
+	case PROTOBUF_C_TYPE_SINT64:
+		for (i = 0; i < count; i++)
+			rv += sint64_size(((int64_t *) array)[i]);
+		break;
+	case PROTOBUF_C_TYPE_INT64:
+	case PROTOBUF_C_TYPE_UINT64:
+		for (i = 0; i < count; i++)
+			rv += uint64_size(((uint64_t *) array)[i]);
+		break;
+	case PROTOBUF_C_TYPE_SFIXED32:
+	case PROTOBUF_C_TYPE_FIXED32:
+	case PROTOBUF_C_TYPE_FLOAT:
+		rv += 4 * count;
+		break;
+	case PROTOBUF_C_TYPE_SFIXED64:
+	case PROTOBUF_C_TYPE_FIXED64:
+	case PROTOBUF_C_TYPE_DOUBLE:
+		rv += 8 * count;
+		break;
+	case PROTOBUF_C_TYPE_BOOL:
+		rv += count;
+		break;
+	case PROTOBUF_C_TYPE_STRING:
+		for (i = 0; i < count; i++) {
+			size_t len = strlen(((char **) array)[i]);
+			rv += uint32_size(len) + len;
+		}
+		break;
+	case PROTOBUF_C_TYPE_BYTES:
+		for (i = 0; i < count; i++) {
+			size_t len = ((ProtobufCBinaryData *) array)[i].len;
+			rv += uint32_size(len) + len;
+		}
+		break;
+	case PROTOBUF_C_TYPE_MESSAGE:
+		for (i = 0; i < count; i++) {
+			size_t len = protobuf_c_message_get_packed_size(
+				((ProtobufCMessage **) array)[i]);
+			rv += uint32_size(len) + len;
+		}
+		break;
+	}
+
+	if (0 != (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED))
+		header_size += uint32_size(rv);
+	return header_size + rv;
+}
+
+/**
+ * Calculate the serialized size of an unknown field, i.e. one that is passed
+ * through mostly uninterpreted. This is required for forward compatibility if
+ * new fields are added to the message descriptor.
+ *
+ * \param field
+ *      Unknown field type.
+ * \return
+ *      Number of bytes required.
+ */
+static inline size_t
+unknown_field_get_packed_size(const ProtobufCMessageUnknownField *field)
+{
+	return get_tag_size(field->tag) + field->len;
+}
+
+/**@}*/
+
+/*
+ * Calculate the serialized size of the message.
+ */
+size_t protobuf_c_message_get_packed_size(const ProtobufCMessage *message)
+{
+	unsigned i;
+	size_t rv = 0;
+
+	ASSERT_IS_MESSAGE(message);
+	for (i = 0; i < message->descriptor->n_fields; i++) {
+		const ProtobufCFieldDescriptor *field =
+			message->descriptor->fields + i;
+		const void *member =
+			((const char *) message) + field->offset;
+		const void *qmember =
+			((const char *) message) + field->quantifier_offset;
+
+		if (field->label == PROTOBUF_C_LABEL_REQUIRED) {
+			rv += required_field_get_packed_size(field, member);
+		} else if (field->label == PROTOBUF_C_LABEL_OPTIONAL) {
+			rv += optional_field_get_packed_size(field, qmember, member);
+		} else {
+			rv += repeated_field_get_packed_size(
+				field,
+				*(const size_t *) qmember,
+				member
+			);
+		}
+	}
+	for (i = 0; i < message->n_unknown_fields; i++)
+		rv += unknown_field_get_packed_size(&message->unknown_fields[i]);
+	return rv;
+}
+
+/**
+ * \defgroup pack protobuf_c_message_pack() implementation
+ *
+ * Routines mainly used by protobuf_c_message_pack().
+ *
+ * \ingroup internal
+ * @{
+ */
+
+/**
+ * Pack an unsigned 32-bit integer in base-128 varint encoding and return the
+ * number of bytes written, which must be 5 or less.
+ *
+ * \param value
+ *      Value to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static inline size_t
+uint32_pack(uint32_t value, uint8_t *out)
+{
+	unsigned rv = 0;
+
+	if (value >= 0x80) {
+		out[rv++] = value | 0x80;
+		value >>= 7;
+		if (value >= 0x80) {
+			out[rv++] = value | 0x80;
+			value >>= 7;
+			if (value >= 0x80) {
+				out[rv++] = value | 0x80;
+				value >>= 7;
+				if (value >= 0x80) {
+					out[rv++] = value | 0x80;
+					value >>= 7;
+				}
+			}
+		}
+	}
+	/* assert: value<128 */
+	out[rv++] = value;
+	return rv;
+}
+
+/**
+ * Pack a signed 32-bit integer and return the number of bytes written.
+ * Negative numbers are encoded as two's complement 64-bit integers.
+ *
+ * \param value
+ *      Value to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static inline size_t
+int32_pack(int32_t value, uint8_t *out)
+{
+	if (value < 0) {
+		out[0] = value | 0x80;
+		out[1] = (value >> 7) | 0x80;
+		out[2] = (value >> 14) | 0x80;
+		out[3] = (value >> 21) | 0x80;
+		out[4] = (value >> 28) | 0x80;
+		out[5] = out[6] = out[7] = out[8] = 0xff;
+		out[9] = 0x01;
+		return 10;
+	} else {
+		return uint32_pack(value, out);
+	}
+}
+
+/**
+ * Pack a signed 32-bit integer using ZigZag encoding and return the number of
+ * bytes written.
+ *
+ * \param value
+ *      Value to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static inline size_t
+sint32_pack(int32_t value, uint8_t *out)
+{
+	return uint32_pack(zigzag32(value), out);
+}
+
+/**
+ * Pack a 64-bit unsigned integer using base-128 varint encoding and return the
+ * number of bytes written.
+ *
+ * \param value
+ *      Value to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static size_t
+uint64_pack(uint64_t value, uint8_t *out)
+{
+	uint32_t hi = (uint32_t) (value >> 32);
+	uint32_t lo = (uint32_t) value;
+	unsigned rv;
+
+	if (hi == 0)
+		return uint32_pack((uint32_t) lo, out);
+	out[0] = (lo) | 0x80;
+	out[1] = (lo >> 7) | 0x80;
+	out[2] = (lo >> 14) | 0x80;
+	out[3] = (lo >> 21) | 0x80;
+	if (hi < 8) {
+		out[4] = (hi << 4) | (lo >> 28);
+		return 5;
+	} else {
+		out[4] = ((hi & 7) << 4) | (lo >> 28) | 0x80;
+		hi >>= 3;
+	}
+	rv = 5;
+	while (hi >= 128) {
+		out[rv++] = hi | 0x80;
+		hi >>= 7;
+	}
+	out[rv++] = hi;
+	return rv;
+}
+
+/**
+ * Pack a 64-bit signed integer in ZigZag encoding and return the number of
+ * bytes written.
+ *
+ * \param value
+ *      Value to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static inline size_t
+sint64_pack(int64_t value, uint8_t *out)
+{
+	return uint64_pack(zigzag64(value), out);
+}
+
+/**
+ * Pack a 32-bit quantity in little-endian byte order. Used for protobuf wire
+ * types fixed32, sfixed32, float. Similar to "htole32".
+ *
+ * \param value
+ *      Value to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static inline size_t
+fixed32_pack(uint32_t value, void *out)
+{
+#if !defined(WORDS_BIGENDIAN)
+	memcpy(out, &value, 4);
+#else
+	uint8_t *buf = out;
+
+	buf[0] = value;
+	buf[1] = value >> 8;
+	buf[2] = value >> 16;
+	buf[3] = value >> 24;
+#endif
+	return 4;
+}
+
+/**
+ * Pack a 64-bit quantity in little-endian byte order. Used for protobuf wire
+ * types fixed64, sfixed64, double. Similar to "htole64".
+ *
+ * \todo The big-endian impl is really only good for 32-bit machines, a 64-bit
+ * version would be appreciated, plus a way to decide to use 64-bit math where
+ * convenient.
+ *
+ * \param value
+ *      Value to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static inline size_t
+fixed64_pack(uint64_t value, void *out)
+{
+#if !defined(WORDS_BIGENDIAN)
+	memcpy(out, &value, 8);
+#else
+	fixed32_pack(value, out);
+	fixed32_pack(value >> 32, ((char *) out) + 4);
+#endif
+	return 8;
+}
+
+/**
+ * Pack a boolean value as an integer and return the number of bytes written.
+ *
+ * \todo Perhaps on some platforms *out = !!value would be a better impl, b/c
+ * that is idiomatic C++ in some STL implementations.
+ *
+ * \param value
+ *      Value to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static inline size_t
+boolean_pack(protobuf_c_boolean value, uint8_t *out)
+{
+	*out = value ? TRUE : FALSE;
+	return 1;
+}
+
+/**
+ * Pack a NUL-terminated C string and return the number of bytes written. The
+ * output includes a length delimiter.
+ *
+ * The NULL pointer is treated as an empty string. This isn't really necessary,
+ * but it allows people to leave required strings blank. (See Issue #13 in the
+ * bug tracker for a little more explanation).
+ *
+ * \param str
+ *      String to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static inline size_t
+string_pack(const char *str, uint8_t *out)
+{
+	if (str == NULL) {
+		out[0] = 0;
+		return 1;
+	} else {
+		size_t len = strlen(str);
+		size_t rv = uint32_pack(len, out);
+		memcpy(out + rv, str, len);
+		return rv + len;
+	}
+}
+
+/**
+ * Pack a ProtobufCBinaryData and return the number of bytes written. The output
+ * includes a length delimiter.
+ *
+ * \param bd
+ *      ProtobufCBinaryData to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static inline size_t
+binary_data_pack(const ProtobufCBinaryData *bd, uint8_t *out)
+{
+	size_t len = bd->len;
+	size_t rv = uint32_pack(len, out);
+	memcpy(out + rv, bd->data, len);
+	return rv + len;
+}
+
+/**
+ * Pack a ProtobufCMessage and return the number of bytes written. The output
+ * includes a length delimiter.
+ *
+ * \param message
+ *      ProtobufCMessage object to pack.
+ * \param[out] out
+ *      Packed message.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static inline size_t
+prefixed_message_pack(const ProtobufCMessage *message, uint8_t *out)
+{
+	if (message == NULL) {
+		out[0] = 0;
+		return 1;
+	} else {
+		size_t rv = protobuf_c_message_pack(message, out + 1);
+		uint32_t rv_packed_size = uint32_size(rv);
+		if (rv_packed_size != 1)
+			memmove(out + rv_packed_size, out + 1, rv);
+		return uint32_pack(rv, out) + rv;
+	}
+}
+
+/**
+ * Pack a field tag.
+ *
+ * Wire-type will be added in required_field_pack().
+ *
+ * \todo Just call uint64_pack on 64-bit platforms.
+ *
+ * \param id
+ *      Tag value to encode.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static size_t
+tag_pack(uint32_t id, uint8_t *out)
+{
+	if (id < (1 << (32 - 3)))
+		return uint32_pack(id << 3, out);
+	else
+		return uint64_pack(((uint64_t) id) << 3, out);
+}
+
+/**
+ * Pack a required field and return the number of bytes written.
+ *
+ * \param field
+ *      Field descriptor.
+ * \param member
+ *      The field member.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static size_t
+required_field_pack(const ProtobufCFieldDescriptor *field,
+		    const void *member, uint8_t *out)
+{
+	size_t rv = tag_pack(field->id, out);
+
+	switch (field->type) {
+	case PROTOBUF_C_TYPE_SINT32:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		return rv + sint32_pack(*(const int32_t *) member, out + rv);
+	case PROTOBUF_C_TYPE_INT32:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		return rv + int32_pack(*(const uint32_t *) member, out + rv);
+	case PROTOBUF_C_TYPE_UINT32:
+	case PROTOBUF_C_TYPE_ENUM:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		return rv + uint32_pack(*(const uint32_t *) member, out + rv);
+	case PROTOBUF_C_TYPE_SINT64:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		return rv + sint64_pack(*(const int64_t *) member, out + rv);
+	case PROTOBUF_C_TYPE_INT64:
+	case PROTOBUF_C_TYPE_UINT64:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		return rv + uint64_pack(*(const uint64_t *) member, out + rv);
+	case PROTOBUF_C_TYPE_SFIXED32:
+	case PROTOBUF_C_TYPE_FIXED32:
+	case PROTOBUF_C_TYPE_FLOAT:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_32BIT;
+		return rv + fixed32_pack(*(const uint32_t *) member, out + rv);
+	case PROTOBUF_C_TYPE_SFIXED64:
+	case PROTOBUF_C_TYPE_FIXED64:
+	case PROTOBUF_C_TYPE_DOUBLE:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_64BIT;
+		return rv + fixed64_pack(*(const uint64_t *) member, out + rv);
+	case PROTOBUF_C_TYPE_BOOL:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		return rv + boolean_pack(*(const protobuf_c_boolean *) member, out + rv);
+	case PROTOBUF_C_TYPE_STRING:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED;
+		return rv + string_pack(*(char *const *) member, out + rv);
+	case PROTOBUF_C_TYPE_BYTES:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED;
+		return rv + binary_data_pack((const ProtobufCBinaryData *) member, out + rv);
+	case PROTOBUF_C_TYPE_MESSAGE:
+		out[0] |= PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED;
+		return rv + prefixed_message_pack(*(ProtobufCMessage * const *) member, out + rv);
+	}
+	PROTOBUF_C__ASSERT_NOT_REACHED();
+	return 0;
+}
+
+/**
+ * Pack an optional field and return the number of bytes written.
+ *
+ * \param field
+ *      Field descriptor.
+ * \param has
+ *      Whether the field is set.
+ * \param member
+ *      The field member.
+ * \param[out] out
+ *      Packed value.
+ * \return
+ *      Number of bytes written to `out`.
+ */
+static size_t
+optional_field_pack(const ProtobufCFieldDescriptor *field,
+		    const protobuf_c_boolean *has,
+		    const void *member, uint8_t *out)
+{
+	if (field->type == PROTOBUF_C_TYPE_MESSAGE ||
+	    field->type == PROTOBUF_C_TYPE_STRING)
+	{
+		const void *ptr = *(const void * const *) member;
+		if (ptr == NULL || ptr == field->default_value)
+			return 0;
+	} else {
+		if (!*has)
+			return 0;
+	}
+	return required_field_pack(field, member, out);
+}
+
+/**
+ * Given a field type, return the in-memory size.
+ *
+ * \todo Implement as a table lookup.
+ *
+ * \param type
+ *      Field type.
+ * \return
+ *      Size of the field.
+ */
+static inline size_t
+sizeof_elt_in_repeated_array(ProtobufCType type)
+{
+	switch (type) {
+	case PROTOBUF_C_TYPE_SINT32:
+	case PROTOBUF_C_TYPE_INT32:
+	case PROTOBUF_C_TYPE_UINT32:
+	case PROTOBUF_C_TYPE_SFIXED32:
+	case PROTOBUF_C_TYPE_FIXED32:
+	case PROTOBUF_C_TYPE_FLOAT:
+	case PROTOBUF_C_TYPE_ENUM:
+		return 4;
+	case PROTOBUF_C_TYPE_SINT64:
+	case PROTOBUF_C_TYPE_INT64:
+	case PROTOBUF_C_TYPE_UINT64:
+	case PROTOBUF_C_TYPE_SFIXED64:
+	case PROTOBUF_C_TYPE_FIXED64:
+	case PROTOBUF_C_TYPE_DOUBLE:
+		return 8;
+	case PROTOBUF_C_TYPE_BOOL:
+		return sizeof(protobuf_c_boolean);
+	case PROTOBUF_C_TYPE_STRING:
+	case PROTOBUF_C_TYPE_MESSAGE:
+		return sizeof(void *);
+	case PROTOBUF_C_TYPE_BYTES:
+		return sizeof(ProtobufCBinaryData);
+	}
+	PROTOBUF_C__ASSERT_NOT_REACHED();
+	return 0;
+}
+
+/**
+ * Pack an array of 32-bit quantities.
+ *
+ * \param[out] out
+ *      Destination.
+ * \param[in] in
+ *      Source.
+ * \param[in] n
+ *      Number of elements in the source array.
+ */
+static void
+copy_to_little_endian_32(void *out, const void *in, const unsigned n)
+{
+#if !defined(WORDS_BIGENDIAN)
+	memcpy(out, in, n * 4);
+#else
+	unsigned i;
+	const uint32_t *ini = in;
+	for (i = 0; i < n; i++)
+		fixed32_pack(ini[i], (uint32_t *) out + i);
+#endif
+}
+
+/**
+ * Pack an array of 64-bit quantities.
+ *
+ * \param[out] out
+ *      Destination.
+ * \param[in] in
+ *      Source.
+ * \param[in] n
+ *      Number of elements in the source array.
+ */
+static void
+copy_to_little_endian_64(void *out, const void *in, const unsigned n)
+{
+#if !defined(WORDS_BIGENDIAN)
+	memcpy(out, in, n * 8);
+#else
+	unsigned i;
+	const uint64_t *ini = in;
+	for (i = 0; i < n; i++)
+		fixed64_pack(ini[i], (uint64_t *) out + i);
+#endif
+}
+
+/**
+ * Get the minimum number of bytes required to pack a field value of a
+ * particular type.
+ *
+ * \param type
+ *      Field type.
+ * \return
+ *      Number of bytes.
+ */
+static unsigned
+get_type_min_size(ProtobufCType type)
+{
+	if (type == PROTOBUF_C_TYPE_SFIXED32 ||
+	    type == PROTOBUF_C_TYPE_FIXED32 ||
+	    type == PROTOBUF_C_TYPE_FLOAT)
+	{
+		return 4;
+	}
+	if (type == PROTOBUF_C_TYPE_SFIXED64 ||
+	    type == PROTOBUF_C_TYPE_FIXED64 ||
+	    type == PROTOBUF_C_TYPE_DOUBLE)
+	{
+		return 8;
+	}
+	return 1;
+}
+
+/**
+ * Packs the elements of a repeated field and returns the serialised field and
+ * its length.
+ *
+ * \param field
+ *      Field descriptor.
+ * \param count
+ *      Number of elements in the repeated field array.
+ * \param member
+ *      Pointer to the elements for this repeated field.
+ * \param[out] out
+ *      Serialised representation of the repeated field.
+ * \return
+ *      Number of bytes serialised to `out`.
+ */
+static size_t
+repeated_field_pack(const ProtobufCFieldDescriptor *field,
+		    size_t count, const void *member, uint8_t *out)
+{
+	void *array = *(void * const *) member;
+	unsigned i;
+
+	if (0 != (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED)) {
+		unsigned header_len;
+		unsigned len_start;
+		unsigned min_length;
+		unsigned payload_len;
+		unsigned length_size_min;
+		unsigned actual_length_size;
+		uint8_t *payload_at;
+
+		if (count == 0)
+			return 0;
+		header_len = tag_pack(field->id, out);
+		out[0] |= PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED;
+		len_start = header_len;
+		min_length = get_type_min_size(field->type) * count;
+		length_size_min = uint32_size(min_length);
+		header_len += length_size_min;
+		payload_at = out + header_len;
+
+		switch (field->type) {
+		case PROTOBUF_C_TYPE_SFIXED32:
+		case PROTOBUF_C_TYPE_FIXED32:
+		case PROTOBUF_C_TYPE_FLOAT:
+			copy_to_little_endian_32(payload_at, array, count);
+			payload_at += count * 4;
+			break;
+		case PROTOBUF_C_TYPE_SFIXED64:
+		case PROTOBUF_C_TYPE_FIXED64:
+		case PROTOBUF_C_TYPE_DOUBLE:
+			copy_to_little_endian_64(payload_at, array, count);
+			payload_at += count * 8;
+			break;
+		case PROTOBUF_C_TYPE_INT32: {
+			const int32_t *arr = (const int32_t *) array;
+			for (i = 0; i < count; i++)
+				payload_at += int32_pack(arr[i], payload_at);
+			break;
+		}
+		case PROTOBUF_C_TYPE_SINT32: {
+			const int32_t *arr = (const int32_t *) array;
+			for (i = 0; i < count; i++)
+				payload_at += sint32_pack(arr[i], payload_at);
+			break;
+		}
+		case PROTOBUF_C_TYPE_SINT64: {
+			const int64_t *arr = (const int64_t *) array;
+			for (i = 0; i < count; i++)
+				payload_at += sint64_pack(arr[i], payload_at);
+			break;
+		}
+		case PROTOBUF_C_TYPE_ENUM:
+		case PROTOBUF_C_TYPE_UINT32: {
+			const uint32_t *arr = (const uint32_t *) array;
+			for (i = 0; i < count; i++)
+				payload_at += uint32_pack(arr[i], payload_at);
+			break;
+		}
+		case PROTOBUF_C_TYPE_INT64:
+		case PROTOBUF_C_TYPE_UINT64: {
+			const uint64_t *arr = (const uint64_t *) array;
+			for (i = 0; i < count; i++)
+				payload_at += uint64_pack(arr[i], payload_at);
+			break;
+		}
+		case PROTOBUF_C_TYPE_BOOL: {
+			const protobuf_c_boolean *arr = (const protobuf_c_boolean *) array;
+			for (i = 0; i < count; i++)
+				payload_at += boolean_pack(arr[i], payload_at);
+			break;
+		}
+		default:
+			PROTOBUF_C__ASSERT_NOT_REACHED();
+		}
+
+		payload_len = payload_at - (out + header_len);
+		actual_length_size = uint32_size(payload_len);
+		if (length_size_min != actual_length_size) {
+			assert(actual_length_size == length_size_min + 1);
+			memmove(out + header_len + 1, out + header_len,
+				payload_len);
+			header_len++;
+		}
+		uint32_pack(payload_len, out + len_start);
+		return header_len + payload_len;
+	} else {
+		/* not "packed" cased */
+		/* CONSIDER: optimize this case a bit (by putting the loop inside the switch) */
+		size_t rv = 0;
+		unsigned siz = sizeof_elt_in_repeated_array(field->type);
+
+		for (i = 0; i < count; i++) {
+			rv += required_field_pack(field, array, out + rv);
+			array = (char *)array + siz;
+		}
+		return rv;
+	}
+}
+
+static size_t
+unknown_field_pack(const ProtobufCMessageUnknownField *field, uint8_t *out)
+{
+	size_t rv = tag_pack(field->tag, out);
+	out[0] |= field->wire_type;
+	memcpy(out + rv, field->data, field->len);
+	return rv + field->len;
+}
+
+/**@}*/
+
+size_t
+protobuf_c_message_pack(const ProtobufCMessage *message, uint8_t *out)
+{
+	unsigned i;
+	size_t rv = 0;
+
+	ASSERT_IS_MESSAGE(message);
+	for (i = 0; i < message->descriptor->n_fields; i++) {
+		const ProtobufCFieldDescriptor *field =
+			message->descriptor->fields + i;
+		const void *member = ((const char *) message) + field->offset;
+
+		/*
+		 * It doesn't hurt to compute qmember (a pointer to the
+		 * quantifier field of the structure), but the pointer is only
+		 * valid if the field is:
+		 *  - a repeated field, or
+		 *  - an optional field that isn't a pointer type
+		 * (Meaning: not a message or a string).
+		 */
+		const void *qmember =
+			((const char *) message) + field->quantifier_offset;
+
+		if (field->label == PROTOBUF_C_LABEL_REQUIRED) {
+			rv += required_field_pack(field, member, out + rv);
+		} else if (field->label == PROTOBUF_C_LABEL_OPTIONAL) {
+			/*
+			 * Note that qmember is bogus for strings and messages,
+			 * but it isn't used.
+			 */
+			rv += optional_field_pack(field, qmember, member, out + rv);
+		} else {
+			rv += repeated_field_pack(field, *(const size_t *) qmember,
+				member, out + rv);
+		}
+	}
+	for (i = 0; i < message->n_unknown_fields; i++)
+		rv += unknown_field_pack(&message->unknown_fields[i], out + rv);
+	return rv;
+}
+
+/**
+ * \defgroup packbuf protobuf_c_message_pack_to_buffer() implementation
+ *
+ * Routines mainly used by protobuf_c_message_pack_to_buffer().
+ *
+ * \ingroup internal
+ * @{
+ */
+
+/**
+ * Pack a required field to a virtual buffer.
+ *
+ * \param field
+ *      Field descriptor.
+ * \param member
+ *      The element to be packed.
+ * \param[out] buffer
+ *      Virtual buffer to append data to.
+ * \return
+ *      Number of bytes packed.
+ */
+static size_t
+required_field_pack_to_buffer(const ProtobufCFieldDescriptor *field,
+			      const void *member, ProtobufCBuffer *buffer)
+{
+	size_t rv;
+	uint8_t scratch[MAX_UINT64_ENCODED_SIZE * 2];
+
+	rv = tag_pack(field->id, scratch);
+	switch (field->type) {
+	case PROTOBUF_C_TYPE_SINT32:
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		rv += sint32_pack(*(const int32_t *) member, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		break;
+	case PROTOBUF_C_TYPE_INT32:
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		rv += int32_pack(*(const uint32_t *) member, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		break;
+	case PROTOBUF_C_TYPE_UINT32:
+	case PROTOBUF_C_TYPE_ENUM:
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		rv += uint32_pack(*(const uint32_t *) member, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		break;
+	case PROTOBUF_C_TYPE_SINT64:
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		rv += sint64_pack(*(const int64_t *) member, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		break;
+	case PROTOBUF_C_TYPE_INT64:
+	case PROTOBUF_C_TYPE_UINT64:
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		rv += uint64_pack(*(const uint64_t *) member, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		break;
+	case PROTOBUF_C_TYPE_SFIXED32:
+	case PROTOBUF_C_TYPE_FIXED32:
+	case PROTOBUF_C_TYPE_FLOAT:
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_32BIT;
+		rv += fixed32_pack(*(const uint32_t *) member, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		break;
+	case PROTOBUF_C_TYPE_SFIXED64:
+	case PROTOBUF_C_TYPE_FIXED64:
+	case PROTOBUF_C_TYPE_DOUBLE:
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_64BIT;
+		rv += fixed64_pack(*(const uint64_t *) member, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		break;
+	case PROTOBUF_C_TYPE_BOOL:
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_VARINT;
+		rv += boolean_pack(*(const protobuf_c_boolean *) member, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		break;
+	case PROTOBUF_C_TYPE_STRING: {
+		const char *str = *(char *const *) member;
+		size_t sublen = str ? strlen(str) : 0;
+
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED;
+		rv += uint32_pack(sublen, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		buffer->append(buffer, sublen, (const uint8_t *) str);
+		rv += sublen;
+		break;
+	}
+	case PROTOBUF_C_TYPE_BYTES: {
+		const ProtobufCBinaryData *bd = ((const ProtobufCBinaryData *) member);
+		size_t sublen = bd->len;
+
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED;
+		rv += uint32_pack(sublen, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		buffer->append(buffer, sublen, bd->data);
+		rv += sublen;
+		break;
+	}
+	case PROTOBUF_C_TYPE_MESSAGE: {
+		uint8_t simple_buffer_scratch[256];
+		size_t sublen;
+		const ProtobufCMessage *msg = *(ProtobufCMessage * const *) member;
+		ProtobufCBufferSimple simple_buffer =
+			PROTOBUF_C_BUFFER_SIMPLE_INIT(simple_buffer_scratch);
+
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED;
+		if (msg == NULL)
+			sublen = 0;
+		else
+			sublen = protobuf_c_message_pack_to_buffer(msg, &simple_buffer.base);
+		rv += uint32_pack(sublen, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		buffer->append(buffer, sublen, simple_buffer.data);
+		rv += sublen;
+		PROTOBUF_C_BUFFER_SIMPLE_CLEAR(&simple_buffer);
+		break;
+	}
+	default:
+		PROTOBUF_C__ASSERT_NOT_REACHED();
+	}
+	return rv;
+}
+
+/**
+ * Pack an optional field to a buffer.
+ *
+ * \param field
+ *      Field descriptor.
+ * \param has
+ *      Whether the field is set.
+ * \param member
+ *      The element to be packed.
+ * \param[out] buffer
+ *      Virtual buffer to append data to.
+ * \return
+ *      Number of bytes serialised to `buffer`.
+ */
+static size_t
+optional_field_pack_to_buffer(const ProtobufCFieldDescriptor *field,
+			      const protobuf_c_boolean *has,
+			      const void *member, ProtobufCBuffer *buffer)
+{
+	if (field->type == PROTOBUF_C_TYPE_MESSAGE ||
+	    field->type == PROTOBUF_C_TYPE_STRING)
+	{
+		const void *ptr = *(const void *const *) member;
+		if (ptr == NULL || ptr == field->default_value)
+			return 0;
+	} else {
+		if (!*has)
+			return 0;
+	}
+	return required_field_pack_to_buffer(field, member, buffer);
+}
+
+/**
+ * Get the packed size of an array of same field type.
+ *
+ * \param field
+ *      Field descriptor.
+ * \param count
+ *      Number of elements of this type.
+ * \param array
+ *      The elements to get the size of.
+ * \return
+ *      Number of bytes required.
+ */
+static size_t
+get_packed_payload_length(const ProtobufCFieldDescriptor *field,
+			  unsigned count, const void *array)
+{
+	unsigned rv = 0;
+	unsigned i;
+
+	switch (field->type) {
+	case PROTOBUF_C_TYPE_SFIXED32:
+	case PROTOBUF_C_TYPE_FIXED32:
+	case PROTOBUF_C_TYPE_FLOAT:
+		return count * 4;
+	case PROTOBUF_C_TYPE_SFIXED64:
+	case PROTOBUF_C_TYPE_FIXED64:
+	case PROTOBUF_C_TYPE_DOUBLE:
+		return count * 8;
+	case PROTOBUF_C_TYPE_INT32: {
+		const int32_t *arr = (const int32_t *) array;
+		for (i = 0; i < count; i++)
+			rv += int32_size(arr[i]);
+		break;
+	}
+	case PROTOBUF_C_TYPE_SINT32: {
+		const int32_t *arr = (const int32_t *) array;
+		for (i = 0; i < count; i++)
+			rv += sint32_size(arr[i]);
+		break;
+	}
+	case PROTOBUF_C_TYPE_ENUM:
+	case PROTOBUF_C_TYPE_UINT32: {
+		const uint32_t *arr = (const uint32_t *) array;
+		for (i = 0; i < count; i++)
+			rv += uint32_size(arr[i]);
+		break;
+	}
+	case PROTOBUF_C_TYPE_SINT64: {
+		const int64_t *arr = (const int64_t *) array;
+		for (i = 0; i < count; i++)
+			rv += sint64_size(arr[i]);
+		break;
+	}
+	case PROTOBUF_C_TYPE_INT64:
+	case PROTOBUF_C_TYPE_UINT64: {
+		const uint64_t *arr = (const uint64_t *) array;
+		for (i = 0; i < count; i++)
+			rv += uint64_size(arr[i]);
+		break;
+	}
+	case PROTOBUF_C_TYPE_BOOL:
+		return count;
+	default:
+		PROTOBUF_C__ASSERT_NOT_REACHED();
+	}
+	return rv;
+}
+
+/**
+ * Pack an array of same field type to a virtual buffer.
+ *
+ * \param field
+ *      Field descriptor.
+ * \param count
+ *      Number of elements of this type.
+ * \param array
+ *      The elements to get the size of.
+ * \param[out] buffer
+ *      Virtual buffer to append data to.
+ * \return
+ *      Number of bytes packed.
+ */
+static size_t
+pack_buffer_packed_payload(const ProtobufCFieldDescriptor *field,
+			   unsigned count, const void *array,
+			   ProtobufCBuffer *buffer)
+{
+	uint8_t scratch[16];
+	size_t rv = 0;
+	unsigned i;
+
+	switch (field->type) {
+	case PROTOBUF_C_TYPE_SFIXED32:
+	case PROTOBUF_C_TYPE_FIXED32:
+	case PROTOBUF_C_TYPE_FLOAT:
+#if !defined(WORDS_BIGENDIAN)
+		rv = count * 4;
+		goto no_packing_needed;
+#else
+		for (i = 0; i < count; i++) {
+			unsigned len = fixed32_pack(((uint32_t *) array)[i], scratch);
+			buffer->append(buffer, len, scratch);
+			rv += len;
+		}
+		break;
+#endif
+	case PROTOBUF_C_TYPE_SFIXED64:
+	case PROTOBUF_C_TYPE_FIXED64:
+	case PROTOBUF_C_TYPE_DOUBLE:
+#if !defined(WORDS_BIGENDIAN)
+		rv = count * 8;
+		goto no_packing_needed;
+#else
+		for (i = 0; i < count; i++) {
+			unsigned len = fixed64_pack(((uint64_t *) array)[i], scratch);
+			buffer->append(buffer, len, scratch);
+			rv += len;
+		}
+		break;
+#endif
+	case PROTOBUF_C_TYPE_INT32:
+		for (i = 0; i < count; i++) {
+			unsigned len = int32_pack(((int32_t *) array)[i], scratch);
+			buffer->append(buffer, len, scratch);
+			rv += len;
+		}
+		break;
+	case PROTOBUF_C_TYPE_SINT32:
+		for (i = 0; i < count; i++) {
+			unsigned len = sint32_pack(((int32_t *) array)[i], scratch);
+			buffer->append(buffer, len, scratch);
+			rv += len;
+		}
+		break;
+	case PROTOBUF_C_TYPE_ENUM:
+	case PROTOBUF_C_TYPE_UINT32:
+		for (i = 0; i < count; i++) {
+			unsigned len = uint32_pack(((uint32_t *) array)[i], scratch);
+			buffer->append(buffer, len, scratch);
+			rv += len;
+		}
+		break;
+	case PROTOBUF_C_TYPE_SINT64:
+		for (i = 0; i < count; i++) {
+			unsigned len = sint64_pack(((int64_t *) array)[i], scratch);
+			buffer->append(buffer, len, scratch);
+			rv += len;
+		}
+		break;
+	case PROTOBUF_C_TYPE_INT64:
+	case PROTOBUF_C_TYPE_UINT64:
+		for (i = 0; i < count; i++) {
+			unsigned len = uint64_pack(((uint64_t *) array)[i], scratch);
+			buffer->append(buffer, len, scratch);
+			rv += len;
+		}
+		break;
+	case PROTOBUF_C_TYPE_BOOL:
+		for (i = 0; i < count; i++) {
+			unsigned len = boolean_pack(((protobuf_c_boolean *) array)[i], scratch);
+			buffer->append(buffer, len, scratch);
+			rv += len;
+		}
+		return count;
+	default:
+		PROTOBUF_C__ASSERT_NOT_REACHED();
+	}
+	return rv;
+
+no_packing_needed:
+	buffer->append(buffer, rv, array);
+	return rv;
+}
+
+static size_t
+repeated_field_pack_to_buffer(const ProtobufCFieldDescriptor *field,
+			      unsigned count, const void *member,
+			      ProtobufCBuffer *buffer)
+{
+	char *array = *(char * const *) member;
+
+	if (count == 0)
+		return 0;
+	if (0 != (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED)) {
+		uint8_t scratch[MAX_UINT64_ENCODED_SIZE * 2];
+		size_t rv = tag_pack(field->id, scratch);
+		size_t payload_len = get_packed_payload_length(field, count, array);
+		size_t tmp;
+
+		scratch[0] |= PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED;
+		rv += uint32_pack(payload_len, scratch + rv);
+		buffer->append(buffer, rv, scratch);
+		tmp = pack_buffer_packed_payload(field, count, array, buffer);
+		assert(tmp == payload_len);
+		return rv + payload_len;
+	} else {
+		size_t siz;
+		unsigned i;
+		/* CONSIDER: optimize this case a bit (by putting the loop inside the switch) */
+		unsigned rv = 0;
+
+		siz = sizeof_elt_in_repeated_array(field->type);
+		for (i = 0; i < count; i++) {
+			rv += required_field_pack_to_buffer(field, array, buffer);
+			array += siz;
+		}
+		return rv;
+	}
+}
+
+static size_t
+unknown_field_pack_to_buffer(const ProtobufCMessageUnknownField *field,
+			     ProtobufCBuffer *buffer)
+{
+	uint8_t header[MAX_UINT64_ENCODED_SIZE];
+	size_t rv = tag_pack(field->tag, header);
+
+	header[0] |= field->wire_type;
+	buffer->append(buffer, rv, header);
+	buffer->append(buffer, field->len, field->data);
+	return rv + field->len;
+}
+
+/**@}*/
+
+size_t
+protobuf_c_message_pack_to_buffer(const ProtobufCMessage *message,
+				  ProtobufCBuffer *buffer)
+{
+	unsigned i;
+	size_t rv = 0;
+
+	ASSERT_IS_MESSAGE(message);
+	for (i = 0; i < message->descriptor->n_fields; i++) {
+		const ProtobufCFieldDescriptor *field =
+			message->descriptor->fields + i;
+		const void *member =
+			((const char *) message) + field->offset;
+		const void *qmember =
+			((const char *) message) + field->quantifier_offset;
+
+		if (field->label == PROTOBUF_C_LABEL_REQUIRED) {
+			rv += required_field_pack_to_buffer(field, member, buffer);
+		} else if (field->label == PROTOBUF_C_LABEL_OPTIONAL) {
+			rv += optional_field_pack_to_buffer(
+				field,
+				qmember,
+				member,
+				buffer
+			);
+		} else {
+			rv += repeated_field_pack_to_buffer(
+				field,
+				*(const size_t *) qmember,
+				member,
+				buffer
+			);
+		}
+	}
+	for (i = 0; i < message->n_unknown_fields; i++)
+		rv += unknown_field_pack_to_buffer(&message->unknown_fields[i], buffer);
+
+	return rv;
+}
+
+/**
+ * \defgroup unpack unpacking implementation
+ *
+ * Routines mainly used by the unpacking functions.
+ *
+ * \ingroup internal
+ * @{
+ */
+
+static inline int
+int_range_lookup(unsigned n_ranges, const ProtobufCIntRange *ranges, int value)
+{
+	unsigned n;
+	unsigned start;
+
+	if (n_ranges == 0)
+		return -1;
+	start = 0;
+	n = n_ranges;
+	while (n > 1) {
+		unsigned mid = start + n / 2;
+
+		if (value < ranges[mid].start_value) {
+			n = mid - start;
+		} else if (value >= ranges[mid].start_value +
+			   (int) (ranges[mid + 1].orig_index -
+				  ranges[mid].orig_index))
+		{
+			unsigned new_start = mid + 1;
+			n = start + n - new_start;
+			start = new_start;
+		} else
+			return (value - ranges[mid].start_value) +
+			    ranges[mid].orig_index;
+	}
+	if (n > 0) {
+		unsigned start_orig_index = ranges[start].orig_index;
+		unsigned range_size =
+			ranges[start + 1].orig_index - start_orig_index;
+
+		if (ranges[start].start_value <= value &&
+		    value < (int) (ranges[start].start_value + range_size))
+		{
+			return (value - ranges[start].start_value) +
+			    start_orig_index;
+		}
+	}
+	return -1;
+}
+
+static size_t
+parse_tag_and_wiretype(size_t len,
+		       const uint8_t *data,
+		       uint32_t *tag_out,
+		       ProtobufCWireType *wiretype_out)
+{
+	unsigned max_rv = len > 5 ? 5 : len;
+	uint32_t tag = (data[0] & 0x7f) >> 3;
+	unsigned shift = 4;
+	unsigned rv;
+
+	*wiretype_out = data[0] & 7;
+	if ((data[0] & 0x80) == 0) {
+		*tag_out = tag;
+		return 1;
+	}
+	for (rv = 1; rv < max_rv; rv++) {
+		if (data[rv] & 0x80) {
+			tag |= (data[rv] & 0x7f) << shift;
+			shift += 7;
+		} else {
+			tag |= data[rv] << shift;
+			*tag_out = tag;
+			return rv + 1;
+		}
+	}
+	return 0; /* error: bad header */
+}
+
+/* sizeof(ScannedMember) must be <= (1<<BOUND_SIZEOF_SCANNED_MEMBER_LOG2) */
+#define BOUND_SIZEOF_SCANNED_MEMBER_LOG2 5
+typedef struct _ScannedMember ScannedMember;
+/** Field as it's being read. */
+struct _ScannedMember {
+	uint32_t tag;              /**< Field tag. */
+	uint8_t wire_type;         /**< Field type. */
+	uint8_t length_prefix_len; /**< Prefix length. */
+	const ProtobufCFieldDescriptor *field; /**< Field descriptor. */
+	size_t len;                /**< Field length. */
+	const uint8_t *data;       /**< Pointer to field data. */
+};
+
+static inline uint32_t
+scan_length_prefixed_data(size_t len, const uint8_t *data,
+			  size_t *prefix_len_out)
+{
+	unsigned hdr_max = len < 5 ? len : 5;
+	unsigned hdr_len;
+	uint32_t val = 0;
+	unsigned i;
+	unsigned shift = 0;
+
+	for (i = 0; i < hdr_max; i++) {
+		val |= (data[i] & 0x7f) << shift;
+		shift += 7;
+		if ((data[i] & 0x80) == 0)
+			break;
+	}
+	if (i == hdr_max) {
+		PROTOBUF_C_UNPACK_ERROR(("error parsing length for length-prefixed data"))
+		return 0;
+	}
+	hdr_len = i + 1;
+	*prefix_len_out = hdr_len;
+	if (hdr_len + val > len) {
+		PROTOBUF_C_UNPACK_ERROR(("data too short after length-prefix of %u", val))
+		return 0;
+	}
+	return hdr_len + val;
+}
+
+static size_t
+max_b128_numbers(size_t len, const uint8_t *data)
+{
+	size_t rv = 0;
+	while (len--)
+		if ((*data++ & 0x80) == 0)
+			++rv;
+	return rv;
+}
+
+/**@}*/
+
+/**
+ * Merge earlier message into a latter message.
+ *
+ * For numeric types and strings, if the same value appears multiple
+ * times, the parser accepts the last value it sees. For embedded
+ * message fields, the parser merges multiple instances of the same
+ * field. That is, all singular scalar fields in the latter instance
+ * replace those in the former, singular embedded messages are merged,
+ * and repeated fields are concatenated.
+ *
+ * The earlier message should be freed after calling this function, as
+ * some of its fields may have been reused and changed to their default
+ * values during the merge.
+ */
+static protobuf_c_boolean
+merge_messages(ProtobufCMessage *earlier_msg,
+	       ProtobufCMessage *latter_msg,
+	       ProtobufCAllocator *allocator)
+{
+	unsigned i;
+	const ProtobufCFieldDescriptor *fields =
+		earlier_msg->descriptor->fields;
+	for (i = 0; i < latter_msg->descriptor->n_fields; i++) {
+		if (fields[i].label == PROTOBUF_C_LABEL_REPEATED) {
+			size_t *n_earlier =
+				STRUCT_MEMBER_PTR(size_t, earlier_msg,
+						  fields[i].quantifier_offset);
+			uint8_t **p_earlier =
+				STRUCT_MEMBER_PTR(uint8_t *, earlier_msg,
+						  fields[i].offset);
+			size_t *n_latter =
+				STRUCT_MEMBER_PTR(size_t, latter_msg,
+						  fields[i].quantifier_offset);
+			uint8_t **p_latter =
+				STRUCT_MEMBER_PTR(uint8_t *, latter_msg,
+						  fields[i].offset);
+
+			if (*n_earlier > 0) {
+				if (*n_latter > 0) {
+					/* Concatenate the repeated field */
+					size_t el_size =
+						sizeof_elt_in_repeated_array(fields[i].type);
+					uint8_t *new_field;
+
+					new_field = do_alloc(allocator,
+						(*n_earlier + *n_latter) * el_size);
+					if (!new_field)
+						return FALSE;
+
+					memcpy(new_field, *p_earlier,
+					       *n_earlier * el_size);
+					memcpy(new_field +
+					       *n_earlier * el_size,
+					       *p_latter,
+					       *n_latter * el_size);
+
+					do_free(allocator, *p_latter);
+					do_free(allocator, *p_earlier);
+					*p_latter = new_field;
+					*n_latter = *n_earlier + *n_latter;
+				} else {
+					/* Zero copy the repeated field from the earlier message */
+					*n_latter = *n_earlier;
+					*p_latter = *p_earlier;
+				}
+				/* Make sure the field does not get double freed */
+				*n_earlier = 0;
+				*p_earlier = 0;
+			}
+		} else if (fields[i].type == PROTOBUF_C_TYPE_MESSAGE) {
+			ProtobufCMessage **em =
+				STRUCT_MEMBER_PTR(ProtobufCMessage *,
+						  earlier_msg,
+						  fields[i].offset);
+			ProtobufCMessage **lm =
+				STRUCT_MEMBER_PTR(ProtobufCMessage *,
+						  latter_msg,
+						  fields[i].offset);
+			if (*em != NULL) {
+				if (*lm != NULL) {
+					if (!merge_messages
+					    (*em, *lm, allocator))
+						return FALSE;
+				} else {
+					/* Zero copy the optional message */
+					assert(fields[i].label ==
+					       PROTOBUF_C_LABEL_OPTIONAL);
+					*lm = *em;
+					*em = NULL;
+				}
+			}
+		} else if (fields[i].label == PROTOBUF_C_LABEL_OPTIONAL) {
+			size_t el_size = 0;
+			protobuf_c_boolean need_to_merge = FALSE;
+			void *earlier_elem =
+				STRUCT_MEMBER_P(earlier_msg, fields[i].offset);
+			void *latter_elem =
+				STRUCT_MEMBER_P(latter_msg, fields[i].offset);
+			const void *def_val = fields[i].default_value;
+
+			switch (fields[i].type) {
+			case PROTOBUF_C_TYPE_BYTES: {
+				uint8_t *e_data, *l_data;
+				const ProtobufCBinaryData *d_bd;
+
+				e_data = ((ProtobufCBinaryData *) earlier_elem)->data;
+				l_data = ((ProtobufCBinaryData *) latter_elem)->data;
+				d_bd = (ProtobufCBinaryData *) def_val;
+
+				need_to_merge =
+					(e_data != NULL &&
+					 (d_bd != NULL &&
+					  e_data != d_bd->data)) &&
+					(l_data == NULL ||
+					 (d_bd != NULL &&
+					  l_data == d_bd->data));
+				break;
+			}
+			case PROTOBUF_C_TYPE_STRING: {
+				char *e_str, *l_str;
+				const char *d_str;
+
+				el_size = sizeof(char *);
+				e_str = *(char **) earlier_elem;
+				l_str = *(char **) latter_elem;
+				d_str = def_val;
+
+				need_to_merge = e_str != d_str && l_str == d_str;
+				break;
+			}
+			default: {
+				el_size = sizeof_elt_in_repeated_array(fields[i].type);
+
+				need_to_merge =
+					STRUCT_MEMBER(protobuf_c_boolean,
+						      earlier_msg,
+						      fields[i].quantifier_offset) &&
+					!STRUCT_MEMBER(protobuf_c_boolean,
+						       latter_msg,
+						       fields[i].quantifier_offset);
+				break;
+			}
+			}
+
+			if (need_to_merge) {
+				memcpy(latter_elem, earlier_elem, el_size);
+				/*
+				 * Reset the element from the old message to 0
+				 * to make sure earlier message deallocation
+				 * doesn't corrupt zero-copied data in the new
+				 * message, earlier message will be freed after
+				 * this function is called anyway
+				 */
+				memset(earlier_elem, 0, el_size);
+
+				if (fields[i].quantifier_offset != 0) {
+					/* Set the has field, if applicable */
+					STRUCT_MEMBER(protobuf_c_boolean,
+						      latter_msg,
+						      fields[i].
+						      quantifier_offset) = TRUE;
+					STRUCT_MEMBER(protobuf_c_boolean,
+						      earlier_msg,
+						      fields[i].
+						      quantifier_offset) = FALSE;
+				}
+			}
+		}
+	}
+	return TRUE;
+}
+
+/**
+ * Count packed elements.
+ *
+ * Given a raw slab of packed-repeated values, determine the number of
+ * elements. This function detects certain kinds of errors but not
+ * others; the remaining error checking is done by
+ * parse_packed_repeated_member().
+ */
+static protobuf_c_boolean
+count_packed_elements(ProtobufCType type,
+		      size_t len, const uint8_t *data, size_t *count_out)
+{
+	switch (type) {
+	case PROTOBUF_C_TYPE_SFIXED32:
+	case PROTOBUF_C_TYPE_FIXED32:
+	case PROTOBUF_C_TYPE_FLOAT:
+		if (len % 4 != 0) {
+			PROTOBUF_C_UNPACK_ERROR(("length must be a multiple of 4 for fixed-length 32-bit types"))
+			return FALSE;
+		}
+		*count_out = len / 4;
+		return TRUE;
+	case PROTOBUF_C_TYPE_SFIXED64:
+	case PROTOBUF_C_TYPE_FIXED64:
+	case PROTOBUF_C_TYPE_DOUBLE:
+		if (len % 8 != 0) {
+			PROTOBUF_C_UNPACK_ERROR(("length must be a multiple of 8 for fixed-length 64-bit types"))
+			return FALSE;
+		}
+		*count_out = len / 8;
+		return TRUE;
+	case PROTOBUF_C_TYPE_INT32:
+	case PROTOBUF_C_TYPE_SINT32:
+	case PROTOBUF_C_TYPE_ENUM:
+	case PROTOBUF_C_TYPE_UINT32:
+	case PROTOBUF_C_TYPE_INT64:
+	case PROTOBUF_C_TYPE_SINT64:
+	case PROTOBUF_C_TYPE_UINT64:
+		*count_out = max_b128_numbers(len, data);
+		return TRUE;
+	case PROTOBUF_C_TYPE_BOOL:
+		*count_out = len;
+		return TRUE;
+	case PROTOBUF_C_TYPE_STRING:
+	case PROTOBUF_C_TYPE_BYTES:
+	case PROTOBUF_C_TYPE_MESSAGE:
+	default:
+		PROTOBUF_C_UNPACK_ERROR(("bad protobuf-c type %u for packed-repeated", type))
+		return FALSE;
+	}
+}
+
+static inline uint32_t
+parse_uint32(unsigned len, const uint8_t *data)
+{
+	uint32_t rv = data[0] & 0x7f;
+	if (len > 1) {
+		rv |= ((uint32_t) (data[1] & 0x7f) << 7);
+		if (len > 2) {
+			rv |= ((uint32_t) (data[2] & 0x7f) << 14);
+			if (len > 3) {
+				rv |= ((uint32_t) (data[3] & 0x7f) << 21);
+				if (len > 4)
+					rv |= ((uint32_t) (data[4]) << 28);
+			}
+		}
+	}
+	return rv;
+}
+
+static inline uint32_t
+parse_int32(unsigned len, const uint8_t *data)
+{
+	return parse_uint32(len, data);
+}
+
+static inline int32_t
+unzigzag32(uint32_t v)
+{
+	if (v & 1)
+		return -(v >> 1) - 1;
+	else
+		return v >> 1;
+}
+
+static inline uint32_t
+parse_fixed_uint32(const uint8_t *data)
+{
+#if !defined(WORDS_BIGENDIAN)
+	uint32_t t;
+	memcpy(&t, data, 4);
+	return t;
+#else
+	return data[0] |
+		((uint32_t) (data[1]) << 8) |
+		((uint32_t) (data[2]) << 16) |
+		((uint32_t) (data[3]) << 24);
+#endif
+}
+
+static uint64_t
+parse_uint64(unsigned len, const uint8_t *data)
+{
+	unsigned shift, i;
+	uint64_t rv;
+
+	if (len < 5)
+		return parse_uint32(len, data);
+	rv = ((uint64_t) (data[0] & 0x7f)) |
+		((uint64_t) (data[1] & 0x7f) << 7) |
+		((uint64_t) (data[2] & 0x7f) << 14) |
+		((uint64_t) (data[3] & 0x7f) << 21);
+	shift = 28;
+	for (i = 4; i < len; i++) {
+		rv |= (((uint64_t) (data[i] & 0x7f)) << shift);
+		shift += 7;
+	}
+	return rv;
+}
+
+static inline int64_t
+unzigzag64(uint64_t v)
+{
+	if (v & 1)
+		return -(v >> 1) - 1;
+	else
+		return v >> 1;
+}
+
+static inline uint64_t
+parse_fixed_uint64(const uint8_t *data)
+{
+#if !defined(WORDS_BIGENDIAN)
+	uint64_t t;
+	memcpy(&t, data, 8);
+	return t;
+#else
+	return (uint64_t) parse_fixed_uint32(data) |
+		(((uint64_t) parse_fixed_uint32(data + 4)) << 32);
+#endif
+}
+
+static protobuf_c_boolean
+parse_boolean(unsigned len, const uint8_t *data)
+{
+	unsigned i;
+	for (i = 0; i < len; i++)
+		if (data[i] & 0x7f)
+			return TRUE;
+	return FALSE;
+}
+
+static protobuf_c_boolean
+parse_required_member(ScannedMember *scanned_member,
+		      void *member,
+		      ProtobufCAllocator *allocator,
+		      protobuf_c_boolean maybe_clear)
+{
+	unsigned len = scanned_member->len;
+	const uint8_t *data = scanned_member->data;
+	ProtobufCWireType wire_type = scanned_member->wire_type;
+
+	switch (scanned_member->field->type) {
+	case PROTOBUF_C_TYPE_INT32:
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_VARINT)
+			return FALSE;
+		*(uint32_t *) member = parse_int32(len, data);
+		return TRUE;
+	case PROTOBUF_C_TYPE_UINT32:
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_VARINT)
+			return FALSE;
+		*(uint32_t *) member = parse_uint32(len, data);
+		return TRUE;
+	case PROTOBUF_C_TYPE_SINT32:
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_VARINT)
+			return FALSE;
+		*(int32_t *) member = unzigzag32(parse_uint32(len, data));
+		return TRUE;
+	case PROTOBUF_C_TYPE_SFIXED32:
+	case PROTOBUF_C_TYPE_FIXED32:
+	case PROTOBUF_C_TYPE_FLOAT:
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_32BIT)
+			return FALSE;
+		*(uint32_t *) member = parse_fixed_uint32(data);
+		return TRUE;
+	case PROTOBUF_C_TYPE_INT64:
+	case PROTOBUF_C_TYPE_UINT64:
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_VARINT)
+			return FALSE;
+		*(uint64_t *) member = parse_uint64(len, data);
+		return TRUE;
+	case PROTOBUF_C_TYPE_SINT64:
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_VARINT)
+			return FALSE;
+		*(int64_t *) member = unzigzag64(parse_uint64(len, data));
+		return TRUE;
+	case PROTOBUF_C_TYPE_SFIXED64:
+	case PROTOBUF_C_TYPE_FIXED64:
+	case PROTOBUF_C_TYPE_DOUBLE:
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_64BIT)
+			return FALSE;
+		*(uint64_t *) member = parse_fixed_uint64(data);
+		return TRUE;
+	case PROTOBUF_C_TYPE_BOOL:
+		*(protobuf_c_boolean *) member = parse_boolean(len, data);
+		return TRUE;
+	case PROTOBUF_C_TYPE_ENUM:
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_VARINT)
+			return FALSE;
+		*(uint32_t *) member = parse_uint32(len, data);
+		return TRUE;
+	case PROTOBUF_C_TYPE_STRING: {
+		char **pstr = member;
+		unsigned pref_len = scanned_member->length_prefix_len;
+
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED)
+			return FALSE;
+
+		if (maybe_clear && *pstr != NULL) {
+			const char *def = scanned_member->field->default_value;
+			if (*pstr != NULL && *pstr != def)
+				do_free(allocator, *pstr);
+		}
+		*pstr = do_alloc(allocator, len - pref_len + 1);
+		if (*pstr == NULL)
+			return FALSE;
+		memcpy(*pstr, data + pref_len, len - pref_len);
+		(*pstr)[len - pref_len] = 0;
+		return TRUE;
+	}
+	case PROTOBUF_C_TYPE_BYTES: {
+		ProtobufCBinaryData *bd = member;
+		const ProtobufCBinaryData *def_bd;
+		unsigned pref_len = scanned_member->length_prefix_len;
+
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED)
+			return FALSE;
+
+		def_bd = scanned_member->field->default_value;
+		if (maybe_clear &&
+		    bd->data != NULL &&
+		    (def_bd == NULL || bd->data != def_bd->data))
+		{
+			do_free(allocator, bd->data);
+		}
+		if (len - pref_len > 0) {
+			bd->data = do_alloc(allocator, len - pref_len);
+			if (bd->data == NULL)
+				return FALSE;
+			memcpy(bd->data, data + pref_len, len - pref_len);
+		} else {
+			bd->data = NULL;
+		}
+		bd->len = len - pref_len;
+		return TRUE;
+	}
+	case PROTOBUF_C_TYPE_MESSAGE: {
+		ProtobufCMessage **pmessage = member;
+		ProtobufCMessage *subm;
+		const ProtobufCMessage *def_mess;
+		protobuf_c_boolean merge_successful = TRUE;
+		unsigned pref_len = scanned_member->length_prefix_len;
+
+		if (wire_type != PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED)
+			return FALSE;
+
+		def_mess = scanned_member->field->default_value;
+		subm = protobuf_c_message_unpack(scanned_member->field->descriptor,
+						 allocator,
+						 len - pref_len,
+						 data + pref_len);
+
+		if (maybe_clear &&
+		    *pmessage != NULL &&
+		    *pmessage != def_mess)
+		{
+			if (subm != NULL)
+				merge_successful = merge_messages(*pmessage, subm, allocator);
+			/* Delete the previous message */
+			protobuf_c_message_free_unpacked(*pmessage, allocator);
+		}
+		*pmessage = subm;
+		if (subm == NULL || !merge_successful)
+			return FALSE;
+		return TRUE;
+	}
+	}
+	return FALSE;
+}
+
+static protobuf_c_boolean
+parse_optional_member(ScannedMember *scanned_member,
+		      void *member,
+		      ProtobufCMessage *message,
+		      ProtobufCAllocator *allocator)
+{
+	if (!parse_required_member(scanned_member, member, allocator, TRUE))
+		return FALSE;
+	if (scanned_member->field->quantifier_offset != 0)
+		STRUCT_MEMBER(protobuf_c_boolean,
+			      message,
+			      scanned_member->field->quantifier_offset) = TRUE;
+	return TRUE;
+}
+
+static protobuf_c_boolean
+parse_repeated_member(ScannedMember *scanned_member,
+		      void *member,
+		      ProtobufCMessage *message,
+		      ProtobufCAllocator *allocator)
+{
+	const ProtobufCFieldDescriptor *field = scanned_member->field;
+	size_t *p_n = STRUCT_MEMBER_PTR(size_t, message, field->quantifier_offset);
+	size_t siz = sizeof_elt_in_repeated_array(field->type);
+	char *array = *(char **) member;
+
+	if (!parse_required_member(scanned_member, array + siz * (*p_n),
+				   allocator, FALSE))
+	{
+		return FALSE;
+	}
+	*p_n += 1;
+	return TRUE;
+}
+
+static unsigned
+scan_varint(unsigned len, const uint8_t *data)
+{
+	unsigned i;
+	if (len > 10)
+		len = 10;
+	for (i = 0; i < len; i++)
+		if ((data[i] & 0x80) == 0)
+			break;
+	if (i == len)
+		return 0;
+	return i + 1;
+}
+
+static protobuf_c_boolean
+parse_packed_repeated_member(ScannedMember *scanned_member,
+			     void *member,
+			     ProtobufCMessage *message)
+{
+	const ProtobufCFieldDescriptor *field = scanned_member->field;
+	size_t *p_n = STRUCT_MEMBER_PTR(size_t, message, field->quantifier_offset);
+	size_t siz = sizeof_elt_in_repeated_array(field->type);
+	void *array = *(uint8_t **) member + siz * (*p_n);
+	const uint8_t *at = scanned_member->data + scanned_member->length_prefix_len;
+	size_t rem = scanned_member->len - scanned_member->length_prefix_len;
+	size_t count = 0;
+	unsigned i;
+
+	switch (field->type) {
+	case PROTOBUF_C_TYPE_SFIXED32:
+	case PROTOBUF_C_TYPE_FIXED32:
+	case PROTOBUF_C_TYPE_FLOAT:
+		count = (scanned_member->len - scanned_member->length_prefix_len) / 4;
+#if !defined(WORDS_BIGENDIAN)
+		goto no_unpacking_needed;
+#else
+		for (i = 0; i < count; i++) {
+			((uint32_t *) array)[i] = parse_fixed_uint32(at);
+			at += 4;
+		}
+		break;
+#endif
+	case PROTOBUF_C_TYPE_SFIXED64:
+	case PROTOBUF_C_TYPE_FIXED64:
+	case PROTOBUF_C_TYPE_DOUBLE:
+		count = (scanned_member->len - scanned_member->length_prefix_len) / 8;
+#if !defined(WORDS_BIGENDIAN)
+		goto no_unpacking_needed;
+#else
+		for (i = 0; i < count; i++) {
+			((uint64_t *) array)[i] = parse_fixed_uint64(at);
+			at += 8;
+		}
+		break;
+#endif
+	case PROTOBUF_C_TYPE_INT32:
+		while (rem > 0) {
+			unsigned s = scan_varint(rem, at);
+			if (s == 0) {
+				PROTOBUF_C_UNPACK_ERROR(("bad packed-repeated int32 value"))
+				return FALSE;
+			}
+			((int32_t *) array)[count++] = parse_int32(s, at);
+			at += s;
+			rem -= s;
+		}
+		break;
+	case PROTOBUF_C_TYPE_SINT32:
+		while (rem > 0) {
+			unsigned s = scan_varint(rem, at);
+			if (s == 0) {
+				PROTOBUF_C_UNPACK_ERROR(("bad packed-repeated sint32 value"))
+				return FALSE;
+			}
+			((int32_t *) array)[count++] = unzigzag32(parse_uint32(s, at));
+			at += s;
+			rem -= s;
+		}
+		break;
+	case PROTOBUF_C_TYPE_ENUM:
+	case PROTOBUF_C_TYPE_UINT32:
+		while (rem > 0) {
+			unsigned s = scan_varint(rem, at);
+			if (s == 0) {
+				PROTOBUF_C_UNPACK_ERROR(("bad packed-repeated enum or uint32 value"))
+				return FALSE;
+			}
+			((uint32_t *) array)[count++] = parse_uint32(s, at);
+			at += s;
+			rem -= s;
+		}
+		break;
+
+	case PROTOBUF_C_TYPE_SINT64:
+		while (rem > 0) {
+			unsigned s = scan_varint(rem, at);
+			if (s == 0) {
+				PROTOBUF_C_UNPACK_ERROR(("bad packed-repeated sint64 value"))
+				return FALSE;
+			}
+			((int64_t *) array)[count++] = unzigzag64(parse_uint64(s, at));
+			at += s;
+			rem -= s;
+		}
+		break;
+	case PROTOBUF_C_TYPE_INT64:
+	case PROTOBUF_C_TYPE_UINT64:
+		while (rem > 0) {
+			unsigned s = scan_varint(rem, at);
+			if (s == 0) {
+				PROTOBUF_C_UNPACK_ERROR(("bad packed-repeated int64/uint64 value"))
+				return FALSE;
+			}
+			((int64_t *) array)[count++] = parse_uint64(s, at);
+			at += s;
+			rem -= s;
+		}
+		break;
+	case PROTOBUF_C_TYPE_BOOL:
+		count = rem;
+		for (i = 0; i < count; i++) {
+			if (at[i] > 1) {
+				PROTOBUF_C_UNPACK_ERROR(("bad packed-repeated boolean value"))
+				return FALSE;
+			}
+			((protobuf_c_boolean *) array)[i] = at[i];
+		}
+		break;
+	default:
+		PROTOBUF_C__ASSERT_NOT_REACHED();
+	}
+	*p_n += count;
+	return TRUE;
+
+#if !defined(WORDS_BIGENDIAN)
+no_unpacking_needed:
+	memcpy(array, at, count * siz);
+	*p_n += count;
+	return TRUE;
+#endif
+}
+
+static protobuf_c_boolean
+is_packable_type(ProtobufCType type)
+{
+	return
+		type != PROTOBUF_C_TYPE_STRING &&
+		type != PROTOBUF_C_TYPE_BYTES &&
+		type != PROTOBUF_C_TYPE_MESSAGE;
+}
+
+static protobuf_c_boolean
+parse_member(ScannedMember *scanned_member,
+	     ProtobufCMessage *message,
+	     ProtobufCAllocator *allocator)
+{
+	const ProtobufCFieldDescriptor *field = scanned_member->field;
+	void *member;
+
+	if (field == NULL) {
+		ProtobufCMessageUnknownField *ufield =
+			message->unknown_fields +
+			(message->n_unknown_fields++);
+		ufield->tag = scanned_member->tag;
+		ufield->wire_type = scanned_member->wire_type;
+		ufield->len = scanned_member->len;
+		ufield->data = do_alloc(allocator, scanned_member->len);
+		if (ufield->data == NULL)
+			return FALSE;
+		memcpy(ufield->data, scanned_member->data, ufield->len);
+		return TRUE;
+	}
+	member = (char *) message + field->offset;
+	switch (field->label) {
+	case PROTOBUF_C_LABEL_REQUIRED:
+		return parse_required_member(scanned_member, member,
+					     allocator, TRUE);
+	case PROTOBUF_C_LABEL_OPTIONAL:
+		return parse_optional_member(scanned_member, member,
+					     message, allocator);
+	case PROTOBUF_C_LABEL_REPEATED:
+		if (scanned_member->wire_type ==
+		    PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED &&
+		    (0 != (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED) ||
+		     is_packable_type(field->type)))
+		{
+			return parse_packed_repeated_member(scanned_member,
+							    member, message);
+		} else {
+			return parse_repeated_member(scanned_member,
+						     member, message,
+						     allocator);
+		}
+	}
+	PROTOBUF_C__ASSERT_NOT_REACHED();
+	return 0;
+}
+
+/**
+ * Initialise messages generated by old code.
+ *
+ * This function is used if desc->message_init == NULL (which occurs
+ * for old code, and which would be useful to support allocating
+ * descriptors dynamically).
+ */
+static void
+message_init_generic(const ProtobufCMessageDescriptor *desc,
+		     ProtobufCMessage *message)
+{
+	unsigned i;
+
+	memset(message, 0, desc->sizeof_message);
+	message->descriptor = desc;
+	for (i = 0; i < desc->n_fields; i++) {
+		if (desc->fields[i].default_value != NULL &&
+		    desc->fields[i].label != PROTOBUF_C_LABEL_REPEATED)
+		{
+			void *field =
+				STRUCT_MEMBER_P(message, desc->fields[i].offset);
+			const void *dv = desc->fields[i].default_value;
+
+			switch (desc->fields[i].type) {
+			case PROTOBUF_C_TYPE_INT32:
+			case PROTOBUF_C_TYPE_SINT32:
+			case PROTOBUF_C_TYPE_SFIXED32:
+			case PROTOBUF_C_TYPE_UINT32:
+			case PROTOBUF_C_TYPE_FIXED32:
+			case PROTOBUF_C_TYPE_FLOAT:
+			case PROTOBUF_C_TYPE_ENUM:
+				memcpy(field, dv, 4);
+				break;
+			case PROTOBUF_C_TYPE_INT64:
+			case PROTOBUF_C_TYPE_SINT64:
+			case PROTOBUF_C_TYPE_SFIXED64:
+			case PROTOBUF_C_TYPE_UINT64:
+			case PROTOBUF_C_TYPE_FIXED64:
+			case PROTOBUF_C_TYPE_DOUBLE:
+				memcpy(field, dv, 8);
+				break;
+			case PROTOBUF_C_TYPE_BOOL:
+				memcpy(field, dv, sizeof(protobuf_c_boolean));
+				break;
+			case PROTOBUF_C_TYPE_BYTES:
+				memcpy(field, dv, sizeof(ProtobufCBinaryData));
+				break;
+
+			case PROTOBUF_C_TYPE_STRING:
+			case PROTOBUF_C_TYPE_MESSAGE:
+				/*
+				 * The next line essentially implements a cast
+				 * from const, which is totally unavoidable.
+				 */
+				*(const void **) field = dv;
+				break;
+			}
+		}
+	}
+}
+
+/**@}*/
+
+/*
+ * ScannedMember slabs (an unpacking implementation detail). Before doing real
+ * unpacking, we first scan through the elements to see how many there are (for
+ * repeated fields), and which field to use (for non-repeated fields given
+ * twice).
+ *
+ * In order to avoid allocations for small messages, we keep a stack-allocated
+ * slab of ScannedMembers of size FIRST_SCANNED_MEMBER_SLAB_SIZE (16). After we
+ * fill that up, we allocate each slab twice as large as the previous one.
+ */
+#define FIRST_SCANNED_MEMBER_SLAB_SIZE_LOG2 4
+
+/*
+ * The number of slabs, including the stack-allocated ones; choose the number so
+ * that we would overflow if we needed a slab larger than provided.
+ */
+#define MAX_SCANNED_MEMBER_SLAB			\
+  (sizeof(unsigned int)*8 - 1			\
+   - BOUND_SIZEOF_SCANNED_MEMBER_LOG2		\
+   - FIRST_SCANNED_MEMBER_SLAB_SIZE_LOG2)
+
+#define REQUIRED_FIELD_BITMAP_SET(index)	\
+	(required_fields_bitmap[(index)/8] |= (1<<((index)%8)))
+
+#define REQUIRED_FIELD_BITMAP_IS_SET(index)	\
+	(required_fields_bitmap[(index)/8] & (1<<((index)%8)))
+
+ProtobufCMessage *
+protobuf_c_message_unpack(const ProtobufCMessageDescriptor *desc,
+			  ProtobufCAllocator *allocator,
+			  size_t len, const uint8_t *data)
+{
+	ProtobufCMessage *rv;
+	size_t rem = len;
+	const uint8_t *at = data;
+	const ProtobufCFieldDescriptor *last_field = desc->fields + 0;
+	ScannedMember first_member_slab[1 <<
+					FIRST_SCANNED_MEMBER_SLAB_SIZE_LOG2];
+
+	/*
+	 * scanned_member_slabs[i] is an array of arrays of ScannedMember.
+	 * The first slab (scanned_member_slabs[0] is just a pointer to
+	 * first_member_slab), above. All subsequent slabs will be allocated
+	 * using the allocator.
+	 */
+	ScannedMember *scanned_member_slabs[MAX_SCANNED_MEMBER_SLAB + 1];
+	unsigned which_slab = 0; /* the slab we are currently populating */
+	unsigned in_slab_index = 0; /* number of members in the slab */
+	size_t n_unknown = 0;
+	unsigned f;
+	unsigned j;
+	unsigned i_slab;
+	unsigned last_field_index = 0;
+	unsigned required_fields_bitmap_len;
+	unsigned char required_fields_bitmap_stack[16];
+	unsigned char *required_fields_bitmap = required_fields_bitmap_stack;
+	protobuf_c_boolean required_fields_bitmap_alloced = FALSE;
+
+	ASSERT_IS_MESSAGE_DESCRIPTOR(desc);
+
+	if (allocator == NULL)
+		allocator = &protobuf_c__allocator;
+
+	rv = do_alloc(allocator, desc->sizeof_message);
+	if (!rv)
+		return (NULL);
+	scanned_member_slabs[0] = first_member_slab;
+
+	required_fields_bitmap_len = (desc->n_fields + 7) / 8;
+	if (required_fields_bitmap_len > sizeof(required_fields_bitmap_stack)) {
+		required_fields_bitmap = do_alloc(allocator, required_fields_bitmap_len);
+		if (!required_fields_bitmap) {
+			do_free(allocator, rv);
+			return (NULL);
+		}
+		required_fields_bitmap_alloced = TRUE;
+	}
+	memset(required_fields_bitmap, 0, required_fields_bitmap_len);
+
+	/*
+	 * Generated code always defines "message_init". However, we provide a
+	 * fallback for (1) users of old protobuf-c generated-code that do not
+	 * provide the function, and (2) descriptors constructed from some other
+	 * source (most likely, direct construction from the .proto file).
+	 */
+	if (desc->message_init != NULL)
+		protobuf_c_message_init(desc, rv);
+	else
+		message_init_generic(desc, rv);
+
+	while (rem > 0) {
+		uint32_t tag;
+		ProtobufCWireType wire_type;
+		size_t used = parse_tag_and_wiretype(rem, at, &tag, &wire_type);
+		const ProtobufCFieldDescriptor *field;
+		ScannedMember tmp;
+
+		if (used == 0) {
+			PROTOBUF_C_UNPACK_ERROR(("error parsing tag/wiretype at offset %u",
+						(unsigned) (at - data)))
+			goto error_cleanup_during_scan;
+		}
+		/*
+                 * \todo Consider optimizing for field[1].id == tag, if field[1]
+                 * exists!
+                 */
+		if (last_field == NULL || last_field->id != tag) {
+			/* lookup field */
+			int field_index =
+			    int_range_lookup(desc->n_field_ranges,
+					     desc->field_ranges,
+					     tag);
+			if (field_index < 0) {
+				field = NULL;
+				n_unknown++;
+			} else {
+				field = desc->fields + field_index;
+				last_field = field;
+				last_field_index = field_index;
+			}
+		} else {
+			field = last_field;
+		}
+
+		if (field != NULL && field->label == PROTOBUF_C_LABEL_REQUIRED)
+			REQUIRED_FIELD_BITMAP_SET(last_field_index);
+
+		at += used;
+		rem -= used;
+		tmp.tag = tag;
+		tmp.wire_type = wire_type;
+		tmp.field = field;
+		tmp.data = at;
+		tmp.length_prefix_len = 0;
+
+		switch (wire_type) {
+		case PROTOBUF_C_WIRE_TYPE_VARINT: {
+			unsigned max_len = rem < 10 ? rem : 10;
+			unsigned i;
+
+			for (i = 0; i < max_len; i++)
+				if ((at[i] & 0x80) == 0)
+					break;
+			if (i == max_len) {
+				PROTOBUF_C_UNPACK_ERROR(("unterminated varint at offset %u",
+							(unsigned) (at - data)))
+				goto error_cleanup_during_scan;
+			}
+			tmp.len = i + 1;
+			break;
+		}
+		case PROTOBUF_C_WIRE_TYPE_64BIT:
+			if (rem < 8) {
+				PROTOBUF_C_UNPACK_ERROR(("too short after 64bit wiretype at offset %u",
+							(unsigned) (at - data)))
+				goto error_cleanup_during_scan;
+			}
+			tmp.len = 8;
+			break;
+		case PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED: {
+			size_t pref_len;
+
+			tmp.len = scan_length_prefixed_data(rem, at, &pref_len);
+			if (tmp.len == 0) {
+				/* NOTE: scan_length_prefixed_data calls UNPACK_ERROR */
+				goto error_cleanup_during_scan;
+			}
+			tmp.length_prefix_len = pref_len;
+			break;
+		}
+		case PROTOBUF_C_WIRE_TYPE_32BIT:
+			if (rem < 4) {
+				PROTOBUF_C_UNPACK_ERROR(("too short after 32bit wiretype at offset %u",
+					      (unsigned) (at - data)))
+				goto error_cleanup_during_scan;
+			}
+			tmp.len = 4;
+			break;
+		default:
+			PROTOBUF_C_UNPACK_ERROR(("unsupported tag %u at offset %u",
+						wire_type, (unsigned) (at - data)))
+			goto error_cleanup_during_scan;
+		}
+
+		if (in_slab_index == (1U <<
+			(which_slab + FIRST_SCANNED_MEMBER_SLAB_SIZE_LOG2)))
+		{
+			size_t size;
+
+			in_slab_index = 0;
+			if (which_slab == MAX_SCANNED_MEMBER_SLAB) {
+				PROTOBUF_C_UNPACK_ERROR(("too many fields"))
+				goto error_cleanup_during_scan;
+			}
+			which_slab++;
+			size = sizeof(ScannedMember)
+				<< (which_slab + FIRST_SCANNED_MEMBER_SLAB_SIZE_LOG2);
+			scanned_member_slabs[which_slab] = do_alloc(allocator, size);
+			if (scanned_member_slabs[which_slab] == NULL)
+				goto error_cleanup_during_scan;
+		}
+		scanned_member_slabs[which_slab][in_slab_index++] = tmp;
+
+		if (field != NULL && field->label == PROTOBUF_C_LABEL_REPEATED) {
+			size_t *n = STRUCT_MEMBER_PTR(size_t, rv,
+						      field->quantifier_offset);
+			if (wire_type == PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED &&
+			    (0 != (field->flags & PROTOBUF_C_FIELD_FLAG_PACKED) ||
+			     is_packable_type(field->type)))
+			{
+				size_t count;
+				if (!count_packed_elements(field->type,
+							   tmp.len -
+							   tmp.length_prefix_len,
+							   tmp.data +
+							   tmp.length_prefix_len,
+							   &count))
+				{
+					PROTOBUF_C_UNPACK_ERROR(("counting packed elements"))
+					goto error_cleanup_during_scan;
+				}
+				*n += count;
+			} else {
+				*n += 1;
+			}
+		}
+
+		at += tmp.len;
+		rem -= tmp.len;
+	}
+
+	/* allocate space for repeated fields, also check that all required fields have been set */
+	for (f = 0; f < desc->n_fields; f++) {
+		const ProtobufCFieldDescriptor *field = desc->fields + f;
+		if (field->label == PROTOBUF_C_LABEL_REPEATED) {
+			size_t siz =
+			    sizeof_elt_in_repeated_array(field->type);
+			size_t *n_ptr =
+			    STRUCT_MEMBER_PTR(size_t, rv,
+					      field->quantifier_offset);
+			if (*n_ptr != 0) {
+				unsigned n = *n_ptr;
+				void *a;
+				*n_ptr = 0;
+				assert(rv->descriptor != NULL);
+#define CLEAR_REMAINING_N_PTRS()                                              \
+              for(f++;f < desc->n_fields; f++)                                \
+                {                                                             \
+                  field = desc->fields + f;                                   \
+                  if (field->label == PROTOBUF_C_LABEL_REPEATED)              \
+                    STRUCT_MEMBER (size_t, rv, field->quantifier_offset) = 0; \
+                }
+				a = do_alloc(allocator, siz * n);
+				if (!a) {
+					CLEAR_REMAINING_N_PTRS();
+					goto error_cleanup;
+				}
+				STRUCT_MEMBER(void *, rv, field->offset) = a;
+			}
+		} else if (field->label == PROTOBUF_C_LABEL_REQUIRED) {
+			if (field->default_value == NULL &&
+			    !REQUIRED_FIELD_BITMAP_IS_SET(f))
+			{
+				CLEAR_REMAINING_N_PTRS();
+				PROTOBUF_C_UNPACK_ERROR(("message '%s': missing required field '%s'",
+							desc->name, field->name))
+				goto error_cleanup;
+			}
+		}
+	}
+#undef CLEAR_REMAINING_N_PTRS
+
+	/* allocate space for unknown fields */
+	if (n_unknown) {
+		rv->unknown_fields = do_alloc(allocator,
+					      n_unknown * sizeof(ProtobufCMessageUnknownField));
+		if (rv->unknown_fields == NULL)
+			goto error_cleanup;
+	}
+
+	/* do real parsing */
+	for (i_slab = 0; i_slab <= which_slab; i_slab++) {
+		unsigned max = (i_slab == which_slab) ?
+			in_slab_index : (1U << (i_slab + 4));
+		ScannedMember *slab = scanned_member_slabs[i_slab];
+		unsigned j;
+
+		for (j = 0; j < max; j++) {
+			if (!parse_member(slab + j, rv, allocator)) {
+				PROTOBUF_C_UNPACK_ERROR(("error parsing member %s of %s",
+							slab->field ? slab->field->name : "*unknown-field*",
+					desc->name))
+				goto error_cleanup;
+			}
+		}
+	}
+
+	/* cleanup */
+	for (j = 1; j <= which_slab; j++)
+		do_free(allocator, scanned_member_slabs[j]);
+	if (required_fields_bitmap_alloced)
+		do_free(allocator, required_fields_bitmap);
+	return rv;
+
+error_cleanup:
+	protobuf_c_message_free_unpacked(rv, allocator);
+	for (j = 1; j <= which_slab; j++)
+		do_free(allocator, scanned_member_slabs[j]);
+	if (required_fields_bitmap_alloced)
+		do_free(allocator, required_fields_bitmap);
+	return NULL;
+
+error_cleanup_during_scan:
+	do_free(allocator, rv);
+	for (j = 1; j <= which_slab; j++)
+		do_free(allocator, scanned_member_slabs[j]);
+	if (required_fields_bitmap_alloced)
+		do_free(allocator, required_fields_bitmap);
+	return NULL;
+}
+
+void
+protobuf_c_message_free_unpacked(ProtobufCMessage *message,
+				 ProtobufCAllocator *allocator)
+{
+	const ProtobufCMessageDescriptor *desc = message->descriptor;
+	unsigned f;
+
+	ASSERT_IS_MESSAGE(message);
+	if (allocator == NULL)
+		allocator = &protobuf_c__allocator;
+	message->descriptor = NULL;
+	for (f = 0; f < desc->n_fields; f++) {
+		if (desc->fields[f].label == PROTOBUF_C_LABEL_REPEATED) {
+			size_t n = STRUCT_MEMBER(size_t,
+						 message,
+						 desc->fields[f].quantifier_offset);
+			void *arr = STRUCT_MEMBER(void *,
+						  message,
+						  desc->fields[f].offset);
+
+			if (desc->fields[f].type == PROTOBUF_C_TYPE_STRING) {
+				unsigned i;
+				for (i = 0; i < n; i++)
+					do_free(allocator, ((char **) arr)[i]);
+			} else if (desc->fields[f].type == PROTOBUF_C_TYPE_BYTES) {
+				unsigned i;
+				for (i = 0; i < n; i++)
+					do_free(allocator, ((ProtobufCBinaryData *) arr)[i].data);
+			} else if (desc->fields[f].type == PROTOBUF_C_TYPE_MESSAGE) {
+				unsigned i;
+				for (i = 0; i < n; i++)
+					protobuf_c_message_free_unpacked(
+						((ProtobufCMessage **) arr)[i],
+						allocator
+					);
+			}
+			if (arr != NULL)
+				do_free(allocator, arr);
+		} else if (desc->fields[f].type == PROTOBUF_C_TYPE_STRING) {
+			char *str = STRUCT_MEMBER(char *, message,
+						  desc->fields[f].offset);
+
+			if (str && str != desc->fields[f].default_value)
+				do_free(allocator, str);
+		} else if (desc->fields[f].type == PROTOBUF_C_TYPE_BYTES) {
+			void *data = STRUCT_MEMBER(ProtobufCBinaryData, message,
+						   desc->fields[f].offset).data;
+			const ProtobufCBinaryData *default_bd;
+
+			default_bd = desc->fields[f].default_value;
+			if (data != NULL &&
+			    (default_bd == NULL ||
+			     default_bd->data != data))
+			{
+				do_free(allocator, data);
+			}
+		} else if (desc->fields[f].type == PROTOBUF_C_TYPE_MESSAGE) {
+			ProtobufCMessage *sm;
+
+			sm = STRUCT_MEMBER(ProtobufCMessage *, message,
+					   desc->fields[f].offset);
+			if (sm && sm != desc->fields[f].default_value)
+				protobuf_c_message_free_unpacked(sm, allocator);
+		}
+	}
+
+	for (f = 0; f < message->n_unknown_fields; f++)
+		do_free(allocator, message->unknown_fields[f].data);
+	if (message->unknown_fields != NULL)
+		do_free(allocator, message->unknown_fields);
+
+	do_free(allocator, message);
+}
+
+void
+protobuf_c_message_init(const ProtobufCMessageDescriptor * descriptor,
+			void *message)
+{
+	descriptor->message_init((ProtobufCMessage *) (message));
+}
+
+protobuf_c_boolean
+protobuf_c_message_check(const ProtobufCMessage *message)
+{
+	unsigned i;
+
+	if (!message ||
+	    !message->descriptor ||
+	    message->descriptor->magic != PROTOBUF_C__MESSAGE_DESCRIPTOR_MAGIC)
+	{
+		return FALSE;
+	}
+
+	for (i = 0; i < message->descriptor->n_fields; i++) {
+		const ProtobufCFieldDescriptor *f = message->descriptor->fields + i;
+		ProtobufCType type = f->type;
+		ProtobufCLabel label = f->label;
+		void *field = STRUCT_MEMBER_P (message, f->offset);
+
+		if (label == PROTOBUF_C_LABEL_REPEATED) {
+			size_t *quantity = STRUCT_MEMBER_P (message, f->quantifier_offset);
+
+			if (*quantity > 0 && *(void **) field == NULL) {
+				return FALSE;
+			}
+
+			if (type == PROTOBUF_C_TYPE_MESSAGE) {
+				ProtobufCMessage **submessage = *(ProtobufCMessage ***) field;
+				unsigned j;
+				for (j = 0; j < *quantity; j++) {
+					if (!protobuf_c_message_check(submessage[j]))
+						return FALSE;
+				}
+			} else if (type == PROTOBUF_C_TYPE_STRING) {
+				char **string = *(char ***) field;
+				unsigned j;
+				for (j = 0; j < *quantity; j++) {
+					if (!string[j])
+						return FALSE;
+				}
+			} else if (type == PROTOBUF_C_TYPE_BYTES) {
+				ProtobufCBinaryData *bd = *(ProtobufCBinaryData **) field;
+				unsigned j;
+				for (j = 0; j < *quantity; j++) {
+					if (bd[j].len > 0 && bd[j].data == NULL)
+						return FALSE;
+				}
+			}
+
+		} else { /* PROTOBUF_C_LABEL_REQUIRED or PROTOBUF_C_LABEL_OPTIONAL */
+
+			if (type == PROTOBUF_C_TYPE_MESSAGE) {
+				ProtobufCMessage *submessage = *(ProtobufCMessage **) field;
+				if (label == PROTOBUF_C_LABEL_REQUIRED || submessage != NULL) {
+					if (!protobuf_c_message_check(submessage))
+						return FALSE;
+				}
+			} else if (type == PROTOBUF_C_TYPE_STRING) {
+				char *string = *(char **) field;
+				if (label == PROTOBUF_C_LABEL_REQUIRED && string == NULL)
+					return FALSE;
+			} else if (type == PROTOBUF_C_TYPE_BYTES) {
+				protobuf_c_boolean *has = STRUCT_MEMBER_P (message, f->quantifier_offset);
+				ProtobufCBinaryData *bd = field;
+				if (label == PROTOBUF_C_LABEL_REQUIRED || *has == TRUE) {
+					if (bd->len > 0 && bd->data == NULL)
+						return FALSE;
+				}
+			}
+		}
+	}
+
+	return TRUE;
+}
+
+/* === services === */
+
+typedef void (*GenericHandler) (void *service,
+				const ProtobufCMessage *input,
+				ProtobufCClosure closure,
+				void *closure_data);
+void
+protobuf_c_service_invoke_internal(ProtobufCService *service,
+				   unsigned method_index,
+				   const ProtobufCMessage *input,
+				   ProtobufCClosure closure,
+				   void *closure_data)
+{
+	GenericHandler *handlers;
+	GenericHandler handler;
+
+	/*
+	 * Verify that method_index is within range. If this fails, you are
+	 * likely invoking a newly added method on an old service. (Although
+	 * other memory corruption bugs can cause this assertion too.)
+	 */
+	assert(method_index < service->descriptor->n_methods);
+
+	/*
+	 * Get the array of virtual methods (which are enumerated by the
+	 * generated code).
+	 */
+	handlers = (GenericHandler *) (service + 1);
+
+	/*
+	 * Get our method and invoke it.
+	 * \todo Seems like handler == NULL is a situation that needs handling.
+	 */
+	handler = handlers[method_index];
+	(*handler)(service, input, closure, closure_data);
+}
+
+void
+protobuf_c_service_generated_init(ProtobufCService *service,
+				  const ProtobufCServiceDescriptor *descriptor,
+				  ProtobufCServiceDestroy destroy)
+{
+	ASSERT_IS_SERVICE_DESCRIPTOR(descriptor);
+	service->descriptor = descriptor;
+	service->destroy = destroy;
+	service->invoke = protobuf_c_service_invoke_internal;
+	memset(service + 1, 0, descriptor->n_methods * sizeof(GenericHandler));
+}
+
+void protobuf_c_service_destroy(ProtobufCService *service)
+{
+	service->destroy(service);
+}
+
+/* --- querying the descriptors --- */
+
+const ProtobufCEnumValue *
+protobuf_c_enum_descriptor_get_value_by_name(const ProtobufCEnumDescriptor *desc,
+					     const char *name)
+{
+	unsigned start = 0;
+	unsigned count = desc->n_value_names;
+
+	while (count > 1) {
+		unsigned mid = start + count / 2;
+		int rv = strcmp(desc->values_by_name[mid].name, name);
+		if (rv == 0)
+			return desc->values + desc->values_by_name[mid].index;
+		else if (rv < 0) {
+			count = start + count - (mid + 1);
+			start = mid + 1;
+		} else
+			count = mid - start;
+	}
+	if (count == 0)
+		return NULL;
+	if (strcmp(desc->values_by_name[start].name, name) == 0)
+		return desc->values + desc->values_by_name[start].index;
+	return NULL;
+}
+
+const ProtobufCEnumValue *
+protobuf_c_enum_descriptor_get_value(const ProtobufCEnumDescriptor *desc,
+				     int value)
+{
+	int rv = int_range_lookup(desc->n_value_ranges, desc->value_ranges, value);
+	if (rv < 0)
+		return NULL;
+	return desc->values + rv;
+}
+
+const ProtobufCFieldDescriptor *
+protobuf_c_message_descriptor_get_field_by_name(const ProtobufCMessageDescriptor *desc,
+						const char *name)
+{
+	unsigned start = 0;
+	unsigned count = desc->n_fields;
+	const ProtobufCFieldDescriptor *field;
+
+	while (count > 1) {
+		unsigned mid = start + count / 2;
+		int rv;
+		field = desc->fields + desc->fields_sorted_by_name[mid];
+		rv = strcmp(field->name, name);
+		if (rv == 0)
+			return field;
+		else if (rv < 0) {
+			count = start + count - (mid + 1);
+			start = mid + 1;
+		} else
+			count = mid - start;
+	}
+	if (count == 0)
+		return NULL;
+	field = desc->fields + desc->fields_sorted_by_name[start];
+	if (strcmp(field->name, name) == 0)
+		return field;
+	return NULL;
+}
+
+const ProtobufCFieldDescriptor *
+protobuf_c_message_descriptor_get_field(const ProtobufCMessageDescriptor *desc,
+					unsigned value)
+{
+	int rv = int_range_lookup(desc->n_field_ranges,desc->field_ranges, value);
+	if (rv < 0)
+		return NULL;
+	return desc->fields + rv;
+}
+
+const ProtobufCMethodDescriptor *
+protobuf_c_service_descriptor_get_method_by_name(const ProtobufCServiceDescriptor *desc,
+						 const char *name)
+{
+	unsigned start = 0;
+	unsigned count = desc->n_methods;
+
+	while (count > 1) {
+		unsigned mid = start + count / 2;
+		unsigned mid_index = desc->method_indices_by_name[mid];
+		const char *mid_name = desc->methods[mid_index].name;
+		int rv = strcmp(mid_name, name);
+
+		if (rv == 0)
+			return desc->methods + desc->method_indices_by_name[mid];
+		if (rv < 0) {
+			count = start + count - (mid + 1);
+			start = mid + 1;
+		} else {
+			count = mid - start;
+		}
+	}
+	if (count == 0)
+		return NULL;
+	if (strcmp(desc->methods[desc->method_indices_by_name[start]].name, name) == 0)
+		return desc->methods + desc->method_indices_by_name[start];
+	return NULL;
+}