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-rw-r--r--backend/escl/escl_jpeg.c230
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diff --git a/backend/escl/escl_jpeg.c b/backend/escl/escl_jpeg.c
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+/* sane - Scanner Access Now Easy.
+
+ Copyright (C) 2019 Touboul Nathane
+ 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>
+
+#if(defined HAVE_LIBJPEG)
+# include <jpeglib.h>
+#endif
+
+#include <setjmp.h>
+
+#define INPUT_BUFFER_SIZE 4096
+
+#if(defined HAVE_LIBJPEG)
+struct my_error_mgr
+{
+ struct jpeg_error_mgr errmgr;
+ jmp_buf escape;
+};
+
+typedef struct
+{
+ struct jpeg_source_mgr pub;
+ FILE *ctx;
+ unsigned char buffer[INPUT_BUFFER_SIZE];
+} my_source_mgr;
+
+/**
+ * \fn static boolean fill_input_buffer(j_decompress_ptr cinfo)
+ * \brief Called in the "skip_input_data" function.
+ *
+ * \return TRUE (everything is OK)
+ */
+static boolean
+fill_input_buffer(j_decompress_ptr cinfo)
+{
+ my_source_mgr *src = (my_source_mgr *) cinfo->src;
+ int nbytes = 0;
+
+ nbytes = fread(src->buffer, 1, INPUT_BUFFER_SIZE, src->ctx);
+ if (nbytes <= 0) {
+ src->buffer[0] = (unsigned char) 0xFF;
+ src->buffer[1] = (unsigned char) JPEG_EOI;
+ nbytes = 2;
+ }
+ src->pub.next_input_byte = src->buffer;
+ src->pub.bytes_in_buffer = nbytes;
+ return (TRUE);
+}
+
+/**
+ * \fn static void skip_input_data(j_decompress_ptr cinfo, long num_bytes)
+ * \brief Called in the "jpeg_RW_src" function.
+ */
+static void
+skip_input_data(j_decompress_ptr cinfo, long num_bytes)
+{
+ my_source_mgr *src = (my_source_mgr *) cinfo->src;
+
+ if (num_bytes > 0) {
+ while (num_bytes > (long) src->pub.bytes_in_buffer) {
+ num_bytes -= (long) src->pub.bytes_in_buffer;
+ (void) src->pub.fill_input_buffer(cinfo);
+ }
+ src->pub.next_input_byte += (size_t) num_bytes;
+ src->pub.bytes_in_buffer -= (size_t) num_bytes;
+ }
+}
+
+static void
+term_source(j_decompress_ptr __sane_unused__ cinfo)
+{
+ return;
+}
+
+static void
+init_source(j_decompress_ptr __sane_unused__ cinfo)
+{
+ return;
+}
+
+/**
+ * \fn static void jpeg_RW_src(j_decompress_ptr cinfo, FILE *ctx)
+ * \brief Called in the "escl_sane_decompressor" function.
+ */
+static void
+jpeg_RW_src(j_decompress_ptr cinfo, FILE *ctx)
+{
+ my_source_mgr *src;
+
+ if (cinfo->src == NULL) {
+ cinfo->src = (struct jpeg_source_mgr *)(*cinfo->mem->alloc_small)
+ ((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof(my_source_mgr));
+ src = (my_source_mgr *) cinfo->src;
+ }
+ src = (my_source_mgr *) cinfo->src;
+ src->pub.init_source = init_source;
+ src->pub.fill_input_buffer = fill_input_buffer;
+ src->pub.skip_input_data = skip_input_data;
+ src->pub.resync_to_restart = jpeg_resync_to_restart;
+ src->pub.term_source = term_source;
+ src->ctx = ctx;
+ src->pub.bytes_in_buffer = 0;
+ src->pub.next_input_byte = NULL;
+}
+
+static void
+my_error_exit(j_common_ptr cinfo)
+{
+ struct my_error_mgr *err = (struct my_error_mgr *)cinfo->err;
+
+ longjmp(err->escape, 1);
+}
+
+static void
+output_no_message(j_common_ptr __sane_unused__ cinfo)
+{
+}
+
+/**
+ * \fn SANE_Status escl_sane_decompressor(escl_sane_t *handler)
+ * \brief Function that aims to decompress the jpeg 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_JPEG_data(capabilities_t *scanner, int *w, int *h, int *bps)
+{
+ int start = 0;
+ struct jpeg_decompress_struct cinfo;
+ JSAMPROW rowptr[1];
+ unsigned char *surface = NULL;
+ struct my_error_mgr jerr;
+ int lineSize = 0;
+
+ if (scanner->tmp == NULL)
+ return (SANE_STATUS_INVAL);
+ fseek(scanner->tmp, SEEK_SET, 0);
+ start = ftell(scanner->tmp);
+ cinfo.err = jpeg_std_error(&jerr.errmgr);
+ jerr.errmgr.error_exit = my_error_exit;
+ jerr.errmgr.output_message = output_no_message;
+ if (setjmp(jerr.escape)) {
+ jpeg_destroy_decompress(&cinfo);
+ if (surface != NULL)
+ free(surface);
+ DBG( 1, "Escl Jpeg : Error reading jpeg\n");
+ if (scanner->tmp) {
+ fclose(scanner->tmp);
+ scanner->tmp = NULL;
+ }
+ return (SANE_STATUS_INVAL);
+ }
+ jpeg_create_decompress(&cinfo);
+ jpeg_RW_src(&cinfo, scanner->tmp);
+ jpeg_read_header(&cinfo, TRUE);
+ cinfo.out_color_space = JCS_RGB;
+ cinfo.quantize_colors = FALSE;
+ jpeg_calc_output_dimensions(&cinfo);
+ surface = malloc(cinfo.output_width * cinfo.output_height * cinfo.output_components);
+ if (surface == NULL) {
+ jpeg_destroy_decompress(&cinfo);
+ fseek(scanner->tmp, start, SEEK_SET);
+ DBG( 1, "Escl Jpeg : Memory allocation problem\n");
+ if (scanner->tmp) {
+ fclose(scanner->tmp);
+ scanner->tmp = NULL;
+ }
+ return (SANE_STATUS_NO_MEM);
+ }
+ lineSize = cinfo.output_width * cinfo.output_components;
+ jpeg_start_decompress(&cinfo);
+ while (cinfo.output_scanline < cinfo.output_height) {
+ rowptr[0] = (JSAMPROW)surface + (lineSize * cinfo.output_scanline);
+ jpeg_read_scanlines(&cinfo, rowptr, (JDIMENSION) 1);
+ }
+ scanner->img_data = surface;
+ scanner->img_size = lineSize * cinfo.output_height;
+ scanner->img_read = 0;
+ *w = cinfo.output_width;
+ *h = cinfo.output_height;
+ *bps = cinfo.output_components;
+ jpeg_finish_decompress(&cinfo);
+ jpeg_destroy_decompress(&cinfo);
+ fclose(scanner->tmp);
+ scanner->tmp = NULL;
+ return (SANE_STATUS_GOOD);
+}
+#else
+
+SANE_Status
+get_JPEG_data(capabilities_t __sane_unused__ *scanner,
+ int __sane_unused__ *w,
+ int __sane_unused__ *h,
+ int __sane_unused__ *bps)
+{
+ return (SANE_STATUS_INVAL);
+}
+
+#endif
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