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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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