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Diffstat (limited to 'sanei/sanei_codec_ascii.c')
-rw-r--r--sanei/sanei_codec_ascii.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/sanei/sanei_codec_ascii.c b/sanei/sanei_codec_ascii.c
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+++ b/sanei/sanei_codec_ascii.c
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+/* sane - Scanner Access Now Easy.
+ Copyright (C) 1997 David Mosberger-Tang
+ This file is part of the SANE package.
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ MA 02111-1307, USA.
+
+ As a special exception, the authors of SANE give permission for
+ additional uses of the libraries contained in this release of SANE.
+
+ The exception is that, if you link a SANE library with other files
+ to produce an executable, this does not by itself cause the
+ resulting executable to be covered by the GNU General Public
+ License. Your use of that executable is in no way restricted on
+ account of linking the SANE library code into it.
+
+ This exception does not, however, invalidate any other reasons why
+ the executable file might be covered by the GNU General Public
+ License.
+
+ If you submit changes to SANE to the maintainers to be included in
+ a subsequent release, you agree by submitting the changes that
+ those changes may be distributed with this exception intact.
+
+ If you write modifications of your own for SANE, it is your choice
+ whether to permit this exception to apply to your modifications.
+ If you do not wish that, delete this exception notice. */
+
+#include "sane/config.h"
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <sane/sane.h>
+#include "../include/sane/sanei_wire.h"
+#include "../include/sane/sanei_codec_ascii.h"
+
+static const char *hexdigit = "0123456789abcdef";
+
+static void
+skip_ws (Wire *w)
+{
+ while (1)
+ {
+ sanei_w_space (w, 1);
+ if (w->status != 0)
+ return;
+
+ if (!isspace (*w->buffer.curr))
+ return;
+
+ ++w->buffer.curr;
+ }
+}
+
+static unsigned
+get_digit (Wire *w)
+{
+ unsigned digit;
+
+ sanei_w_space (w, 1);
+ digit = tolower(*w->buffer.curr++) - '0';
+ if (digit > 9)
+ digit -= 'a' - ('9' + 1);
+ if (digit > 0xf)
+ {
+ w->status = EINVAL;
+ return 0;
+ }
+ return digit;
+}
+
+static SANE_Byte
+get_byte (Wire *w)
+{
+ return get_digit (w) << 4 | get_digit (w);
+}
+
+static void
+ascii_w_byte (Wire *w, void *v)
+{
+ SANE_Byte *b = v;
+
+ switch (w->direction)
+ {
+ case WIRE_ENCODE:
+ sanei_w_space (w, 3);
+ *w->buffer.curr++ = hexdigit[(*b >> 4) & 0x0f];
+ *w->buffer.curr++ = hexdigit[(*b >> 0) & 0x0f];
+ *w->buffer.curr++ = '\n';
+ break;
+
+ case WIRE_DECODE:
+ skip_ws (w);
+ *b = get_byte (w);
+ break;
+
+ case WIRE_FREE:
+ break;
+ }
+}
+
+static void
+ascii_w_char (Wire *w, void *v)
+{
+ SANE_Char *c = v;
+
+ switch (w->direction)
+ {
+ case WIRE_ENCODE:
+ sanei_w_space (w, 5);
+ *w->buffer.curr++ = '\'';
+ if (*c == '\'' || *c == '\\')
+ *w->buffer.curr++ = '\\';
+ *w->buffer.curr++ = *c;
+ *w->buffer.curr++ = '\'';
+ *w->buffer.curr++ = '\n';
+ break;
+
+ case WIRE_DECODE:
+ sanei_w_space (w, 4);
+ if (*w->buffer.curr++ != '\'')
+ {
+ w->status = EINVAL;
+ return;
+ }
+ *c = *w->buffer.curr++;
+ if (*c == '\\')
+ {
+ sanei_w_space (w, 2);
+ *c = *w->buffer.curr++;
+ }
+ if (*w->buffer.curr++ != '\'')
+ {
+ w->status = EINVAL;
+ return;
+ }
+ break;
+
+ case WIRE_FREE:
+ break;
+ }
+}
+
+static void
+ascii_w_string (Wire *w, void *v)
+{
+ size_t len, alloced_len;
+ SANE_String *s = v;
+ char * str, ch;
+ int done;
+
+ switch (w->direction)
+ {
+ case WIRE_ENCODE:
+ if (*s)
+ {
+ sanei_w_space (w, 1);
+ *w->buffer.curr++ = '"';
+ str = *s;
+ while ((ch = *str++))
+ {
+ sanei_w_space (w, 2);
+ if (ch == '"' || ch == '\\')
+ *w->buffer.curr++ = '\\';
+ *w->buffer.curr++ = ch;
+ }
+ *w->buffer.curr++ = '"';
+ }
+ else
+ {
+ sanei_w_space (w, 5);
+ *w->buffer.curr++ = '(';
+ *w->buffer.curr++ = 'n';
+ *w->buffer.curr++ = 'i';
+ *w->buffer.curr++ = 'l';
+ *w->buffer.curr++ = ')';
+ }
+ sanei_w_space (w, 1);
+ *w->buffer.curr++ = '\n';
+ break;
+
+ case WIRE_DECODE:
+ skip_ws (w);
+ sanei_w_space (w, 1);
+ ch = *w->buffer.curr++;
+ if (ch == '"')
+ {
+ alloced_len = len = 0;
+ str = 0;
+ done = 0;
+ do
+ {
+ sanei_w_space (w, 1);
+ if (w->status != 0)
+ return;
+
+ ch = *w->buffer.curr++;
+ if (ch == '"')
+ done = 1;
+
+ if (ch == '\\')
+ {
+ sanei_w_space (w, 1);
+ ch = *w->buffer.curr++;
+ }
+
+ if (len >= alloced_len)
+ {
+ alloced_len += 1024;
+ if (!str)
+ str = malloc (alloced_len);
+ else
+ str = realloc (str, alloced_len);
+
+ if (str == 0)
+ {
+ /* Malloc failed, so return an error. */
+ w->status = ENOMEM;
+ return;
+ }
+ }
+ str[len++] = ch;
+ }
+ while (!done);
+
+ str[len - 1] = '\0';
+ *s = realloc (str, len);
+
+ if (*s == 0)
+ {
+ /* Malloc failed, so return an error. */
+ w->status = ENOMEM;
+ return;
+ }
+ }
+ else if (ch == '(')
+ {
+ sanei_w_space (w, 4);
+ if ( *w->buffer.curr++ != 'n'
+ || *w->buffer.curr++ != 'i'
+ || *w->buffer.curr++ != 'l'
+ || *w->buffer.curr++ != ')')
+ {
+ w->status = EINVAL;
+ return;
+ }
+ *s = 0;
+ }
+ else
+ {
+ w->status = EINVAL;
+ return;
+ }
+ break;
+
+ case WIRE_FREE:
+ if (*s)
+ free (*s);
+ break;
+ }
+}
+
+static void
+ascii_w_word (Wire *w, void *v)
+{
+ SANE_Word val, *word = v;
+ int i, is_negative = 0;
+ char buf[16];
+
+ switch (w->direction)
+ {
+ case WIRE_ENCODE:
+ val = *word;
+ i = sizeof (buf) - 1;
+ if (val < 0)
+ {
+ is_negative = 1;
+ val = -val;
+ }
+ do
+ {
+ buf[i--] = '0' + (val % 10);
+ val /= 10;
+ }
+ while (val);
+ if (is_negative)
+ buf[i--] = '-';
+
+ sanei_w_space (w, sizeof (buf) - i);
+ memcpy (w->buffer.curr, buf + i + 1, sizeof (buf) - i - 1);
+ w->buffer.curr += sizeof (buf) - i - 1;
+ *w->buffer.curr++ = '\n';
+ break;
+
+ case WIRE_DECODE:
+ skip_ws (w);
+ val = 0;
+ sanei_w_space (w, 1);
+ if (*w->buffer.curr == '-')
+ {
+ is_negative = 1;
+ ++w->buffer.curr;
+ }
+ while (1)
+ {
+ sanei_w_space (w, 1);
+ if (w->status != 0)
+ return;
+
+ if (!isdigit (*w->buffer.curr))
+ break;
+
+ val = 10*val + (*w->buffer.curr++ - '0');
+ }
+ *word = is_negative ? -val : val;
+ break;
+
+ case WIRE_FREE:
+ break;
+ }
+}
+
+void
+sanei_codec_ascii_init (Wire *w)
+{
+ w->codec.w_byte = ascii_w_byte;
+ w->codec.w_char = ascii_w_char;
+ w->codec.w_word = ascii_w_word;
+ w->codec.w_string = ascii_w_string;
+}
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