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/* jpegmemcd.c
* (c) 1997, Toshihiro Matsui, Electrotechnical Laboratory
* JPEG compression/decompression for in-core image/jpeg_data.
*
* int JPEG_compress(RGBimage, width, height, JPEGimage,size, quality);
* int JPEG_decompress(JPEGimage, jpeg_size,
* RGBimage, result_size, *width, *height)
*/
#include <stdio.h>
#include "jpeglib.h"
#include <setjmp.h>
#if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
#define jpeg_memio_dest(cinfo, outbuffer, outsize) \
jpeg_mem_dest((j_compress_ptr)cinfo, (unsigned char **)outbuffer, (unsigned long *)outsize)
#define jpeg_memio_src(cinfo, inbuffer, insize) \
jpeg_mem_src((j_decompress_ptr)cinfo, (const unsigned char *)inbuffer, (unsigned long)insize)
#else
GLOBAL(void) jpeg_memio_dest (j_compress_ptr cinfo, JOCTET *jpegimgbuf, long *size);
GLOBAL(void) jpeg_memio_src (j_decompress_ptr cinfo, JOCTET *buf, long size);
#endif
int JPEG_compress(JSAMPLE *image_buffer, long width, long height,
unsigned char *jpeg_image_buffer, long size, int quality)
{
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
int row_stride; /* physical row width in image buffer */
long data_count=size;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
jpeg_memio_dest(&cinfo, jpeg_image_buffer, &data_count);
/* fprintf(stderr,
"jpeg compress: w=%d h=%d src=%x dest=%x size=%d quality=%d\n", width, height,
image_buffer, jpeg_image_buffer, size, quality); */
cinfo.image_width = width; /* image width and height, in pixels */
cinfo.image_height = height;
cinfo.input_components = 3; /* # of color components per pixel */
cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
jpeg_start_compress(&cinfo, TRUE);
row_stride = width * 3; /* JSAMPLEs per row in image_buffer */
while (cinfo.next_scanline < cinfo.image_height) {
row_pointer[0] = & image_buffer[cinfo.next_scanline * row_stride];
(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
}
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
return(data_count);
}
/****************************************************************/
struct my_error_mgr {
struct jpeg_error_mgr pub; /* "public" fields */
jmp_buf setjmp_buffer; /* for return to caller */
};
typedef struct my_error_mgr * my_error_ptr;
static void my_error_exit (j_common_ptr cinfo)
{
my_error_ptr myerr = (my_error_ptr) cinfo->err;
(*cinfo->err->output_message) (cinfo);
longjmp(myerr->setjmp_buffer, 1);
}
extern int JPEG_header (JOCTET *jpeg_image, long jpeg_size,
long *width, long *height , long *components)
{ struct jpeg_decompress_struct cinfo;
struct my_error_mgr jerr;
long total_size;
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = my_error_exit;
if (setjmp(jerr.setjmp_buffer)) {
jpeg_destroy_decompress(&cinfo);
return 0; }
jpeg_create_decompress(&cinfo);
jpeg_memio_src(&cinfo, jpeg_image, jpeg_size);
(void) jpeg_read_header(&cinfo, TRUE);
jpeg_calc_output_dimensions(&cinfo);
*width= cinfo.output_width;
*height= cinfo.output_height;
*components= cinfo.output_components;
total_size = cinfo.output_width * cinfo.output_height *
cinfo.output_components;
jpeg_destroy_decompress(&cinfo);
return(total_size);
}
extern int JPEG_decompress (JOCTET *jpeg_image, long jpeg_size,
JOCTET *result_image,
long *width, long *height)
{
JOCTET *rimage;
struct jpeg_decompress_struct cinfo;
struct my_error_mgr jerr;
JSAMPLE *jsampbuf;
int row_stride; /* physical row width in output buffer */
long total_size;
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = my_error_exit;
if (setjmp(jerr.setjmp_buffer)) {
jpeg_destroy_decompress(&cinfo);
return 0; }
jpeg_create_decompress(&cinfo);
jpeg_memio_src(&cinfo, jpeg_image, jpeg_size);
(void) jpeg_read_header(&cinfo, TRUE);
jpeg_calc_output_dimensions(&cinfo);
*width= cinfo.output_width;
*height= cinfo.output_height;
row_stride = cinfo.output_width * cinfo.output_components;
total_size = row_stride * cinfo.output_height;
/* printf("read_JPEG: width=%d height=%d\n", *width, *height); */
/*if (total_size > result_size) {
fprintf(stderr, "jpeg_decompress: result too big. %d > %d\n",
total_size, result_size);
jpeg_destroy_decompress(&cinfo);
return(FALSE);} */
/* start decompression */
(void) jpeg_start_decompress(&cinfo);
while (cinfo.output_scanline < cinfo.output_height) {
jsampbuf= &result_image[cinfo.output_scanline * row_stride];
(void) jpeg_read_scanlines(&cinfo, &jsampbuf, 1);
}
(void) jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
return(total_size);
}
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