jdatasrc.c
上传用户:luping1608
上传日期:2007-01-06
资源大小:38k
文件大小:2k
- #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;
- }