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-rw-r--r--backend/escl/escl_mupdf.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/backend/escl/escl_mupdf.c b/backend/escl/escl_mupdf.c
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+++ b/backend/escl/escl_mupdf.c
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+/* sane - Scanner Access Now Easy.
+
+ Copyright (C) 2019 Thierry HUCHARD <thierry@ordissimo.com>
+
+ This file is part of the SANE package.
+
+ SANE 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 3 of the License, or (at your
+ option) any later version.
+
+ SANE 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 sane; see the file COPYING. If not, write to the Free
+ Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+ This file implements a SANE backend for eSCL scanners. */
+
+#define DEBUG_DECLARE_ONLY
+#include "../include/sane/config.h"
+
+#include "escl.h"
+
+#include "../include/sane/sanei.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <errno.h>
+
+#if(defined HAVE_MUPDF)
+#include <mupdf/fitz.h>
+#endif
+
+#include <setjmp.h>
+
+
+#if(defined HAVE_MUPDF)
+
+// TODO: WIN32: HANDLE CreateFileW(), etc.
+// TODO: POSIX: int creat(), read(), write(), lseeko, etc.
+
+typedef struct fz_file_stream_escl_s
+{
+ FILE *file;
+ unsigned char buffer[4096];
+} fz_file_stream_escl;
+
+static int
+next_file_escl(fz_context *ctx, fz_stream *stm, size_t n)
+{
+ fz_file_stream_escl *state = stm->state;
+
+ /* n is only a hint, that we can safely ignore */
+ n = fread(state->buffer, 1, sizeof(state->buffer), state->file);
+ if (n < sizeof(state->buffer) && ferror(state->file))
+ fz_throw(ctx, FZ_ERROR_GENERIC, "read error: %s", strerror(errno));
+ stm->rp = state->buffer;
+ stm->wp = state->buffer + n;
+ stm->pos += (int64_t)n;
+
+ if (n == 0)
+ return EOF;
+ return *stm->rp++;
+}
+
+static void
+drop_file_escl(fz_context *ctx, void *state_)
+{
+ fz_file_stream_escl *state = state_;
+ int n = fclose(state->file);
+ if (n < 0)
+ fz_warn(ctx, "close error: %s", strerror(errno));
+ fz_free(ctx, state);
+}
+
+static void
+seek_file_escl(fz_context *ctx, fz_stream *stm, int64_t offset, int whence)
+{
+ fz_file_stream_escl *state = stm->state;
+#ifdef _WIN32
+ int64_t n = _fseeki64(state->file, offset, whence);
+#else
+ int64_t n = fseeko(state->file, offset, whence);
+#endif
+ if (n < 0)
+ fz_throw(ctx, FZ_ERROR_GENERIC, "cannot seek: %s", strerror(errno));
+#ifdef _WIN32
+ stm->pos = _ftelli64(state->file);
+#else
+ stm->pos = ftello(state->file);
+#endif
+ stm->rp = state->buffer;
+ stm->wp = state->buffer;
+}
+
+static fz_stream *
+fz_open_file_ptr_escl(fz_context *ctx, FILE *file)
+{
+ fz_stream *stm;
+ fz_file_stream_escl *state = fz_malloc_struct(ctx, fz_file_stream_escl);
+ state->file = file;
+
+ stm = fz_new_stream(ctx, state, next_file_escl, drop_file_escl);
+ stm->seek = seek_file_escl;
+
+ return stm;
+}
+
+/**
+ * \fn SANE_Status escl_sane_decompressor(escl_sane_t *handler)
+ * \brief Function that aims to decompress the pdf image to SANE be able
+ * to read the image.
+ * This function is called in the "sane_read" function.
+ *
+ * \return SANE_STATUS_GOOD (if everything is OK, otherwise,
+ * SANE_STATUS_NO_MEM/SANE_STATUS_INVAL)
+ */
+SANE_Status
+get_PDF_data(capabilities_t *scanner, int *width, int *height, int *bps)
+{
+ int page_number = -1, page_count = -2;
+ fz_context *ctx;
+ fz_document *doc;
+ fz_pixmap *pix;
+ fz_matrix ctm;
+ fz_stream *stream;
+ unsigned char *surface = NULL; /* Image data */
+ SANE_Status status = SANE_STATUS_GOOD;
+
+ /* Create a context to hold the exception stack and various caches. */
+ ctx = fz_new_context(NULL, NULL, FZ_STORE_UNLIMITED);
+ if (!ctx)
+ {
+ DBG(1, "cannot create mupdf context\n");
+ status = SANE_STATUS_INVAL;
+ goto close_file;
+ }
+
+ /* Register the default file types to handle. */
+ fz_try(ctx)
+ fz_register_document_handlers(ctx);
+ fz_catch(ctx)
+ {
+ DBG(1, "cannot register document handlers: %s\n", fz_caught_message(ctx));
+ status = SANE_STATUS_INVAL;
+ goto drop_context;
+ }
+
+ /* Open the stream. */
+ fz_try(ctx)
+ stream = fz_open_file_ptr_escl(ctx, scanner->tmp);
+ fz_catch(ctx)
+ {
+ DBG(1, "cannot open stream: %s\n", fz_caught_message(ctx));
+ status = SANE_STATUS_INVAL;
+ goto drop_context;
+ }
+
+ /* Seek stream. */
+ fz_try(ctx)
+ fz_seek(ctx, stream, 0, SEEK_SET);
+ fz_catch(ctx)
+ {
+ DBG(1, "cannot seek stream: %s\n", fz_caught_message(ctx));
+ status = SANE_STATUS_INVAL;
+ goto drop_stream;
+ }
+
+ /* Open the document. */
+ fz_try(ctx)
+ doc = fz_open_document_with_stream(ctx, "filename.pdf", stream);
+ fz_catch(ctx)
+ {
+ DBG(1, "cannot open document: %s\n", fz_caught_message(ctx));
+ status = SANE_STATUS_INVAL;
+ goto drop_stream;
+ }
+
+ /* Count the number of pages. */
+ fz_try(ctx)
+ page_count = fz_count_pages(ctx, doc);
+ fz_catch(ctx)
+ {
+ DBG(1, "cannot count number of pages: %s\n", fz_caught_message(ctx));
+ status = SANE_STATUS_INVAL;
+ goto drop_document;
+ }
+
+ if (page_number < 0 || page_number >= page_count)
+ {
+ DBG(1, "page number out of range: %d (page count %d)\n", page_number + 1, page_count);
+ status = SANE_STATUS_INVAL;
+ goto drop_document;
+ }
+
+ /* Compute a transformation matrix for the zoom and rotation desired. */
+ /* The default resolution without scaling is 72 dpi. */
+ fz_scale(&ctm, (float)1.0, (float)1.0);
+ fz_pre_rotate(&ctm, (float)0.0);
+
+ /* Render page to an RGB pixmap. */
+ fz_try(ctx)
+ pix = fz_new_pixmap_from_page_number(ctx, doc, 0, &ctm, fz_device_rgb(ctx), 0);
+ fz_catch(ctx)
+ {
+ DBG(1, "cannot render page: %s\n", fz_caught_message(ctx));
+ status = SANE_STATUS_INVAL;
+ goto drop_document;
+ }
+
+ surface = malloc(pix->h * pix->stride);
+ memcpy(surface, pix->samples, (pix->h * pix->stride));
+
+ // If necessary, trim the image.
+ surface = escl_crop_surface(scanner, surface, pix->w, pix->h, pix->n, width, height);
+ if (!surface) {
+ DBG( 1, "Escl Pdf : Surface Memory allocation problem\n");
+ status = SANE_STATUS_NO_MEM;
+ goto drop_pix;
+ }
+ *bps = pix->n;
+
+ /* Clean up. */
+drop_pix:
+ fz_drop_pixmap(ctx, pix);
+drop_document:
+ fz_drop_document(ctx, doc);
+drop_stream:
+ fz_drop_stream(ctx, stream);
+drop_context:
+ fz_drop_context(ctx);
+
+close_file:
+ if (scanner->tmp)
+ fclose(scanner->tmp);
+ scanner->tmp = NULL;
+ return status;
+}
+#else
+
+SANE_Status
+get_PDF_data(capabilities_t __sane_unused__ *scanner,
+ int __sane_unused__ *width,
+ int __sane_unused__ *height,
+ int __sane_unused__ *bps)
+{
+ return (SANE_STATUS_INVAL);
+}
+
+#endif
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