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quicktime
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jdatasrc.c
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C/C++ Source or Header
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2000-11-29
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2KB
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73 lines
#include <stdio.h>
#include <stdlib.h>
#include "jpeglib.h"
#include "jerror.h"
typedef struct {
struct jpeg_source_mgr pub; /* public fields */
JOCTET * buffer; /* start of buffer */
int bytes; /* total size of buffer */
} my_source_mgr;
typedef my_source_mgr * my_src_ptr;
METHODDEF(void)
quicktime_jpeg_init_source (j_decompress_ptr cinfo)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
}
METHODDEF(boolean)
quicktime_jpeg_fill_input_buffer (j_decompress_ptr cinfo)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
src->buffer[0] = (JOCTET) 0xFF;
src->buffer[1] = (JOCTET) JPEG_EOI;
src->pub.next_input_byte = src->buffer;
src->pub.bytes_in_buffer = 2;
return TRUE;
}
METHODDEF(void)
quicktime_jpeg_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
METHODDEF(void)
quicktime_jpeg_term_source (j_decompress_ptr cinfo)
{
}
GLOBAL(void)
jpeg_buffer_src (j_decompress_ptr cinfo, unsigned char *buffer, long bytes)
{
my_src_ptr src;
if (cinfo->src == NULL) { /* first time for this JPEG object? */
cinfo->src = (struct jpeg_source_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
sizeof(my_source_mgr));
src = (my_src_ptr) cinfo->src;
}
src = (my_src_ptr) cinfo->src;
src->pub.init_source = quicktime_jpeg_init_source;
src->pub.fill_input_buffer = quicktime_jpeg_fill_input_buffer;
src->pub.skip_input_data = quicktime_jpeg_skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
src->pub.term_source = quicktime_jpeg_term_source;
src->pub.bytes_in_buffer = bytes;
src->pub.next_input_byte = buffer;
src->buffer = buffer;
src->bytes = bytes;
}