From ffa8801644a7d53cc1c785e3450f794c07a14eb0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= Date: Sun, 2 Feb 2020 17:13:01 +0100 Subject: New upstream version 1.0.29 --- backend/escl/escl_jpeg.c | 230 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 230 insertions(+) create mode 100644 backend/escl/escl_jpeg.c (limited to 'backend/escl/escl_jpeg.c') diff --git a/backend/escl/escl_jpeg.c b/backend/escl/escl_jpeg.c new file mode 100644 index 0000000..d6287ef --- /dev/null +++ b/backend/escl/escl_jpeg.c @@ -0,0 +1,230 @@ +/* sane - Scanner Access Now Easy. + + Copyright (C) 2019 Touboul Nathane + Copyright (C) 2019 Thierry HUCHARD + + 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 +#include +#include + +#if(defined HAVE_LIBJPEG) +# include +#endif + +#include + +#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 -- cgit v1.2.3