quicktime/jdatasrc.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include "jpeglib.h"
   4 #include "jerror.h"
   5
   6 typedef struct {
   7         struct jpeg_source_mgr pub;     /* public fields */
   8
   9         JOCTET * buffer;                /* start of buffer */
  10         int bytes;             /* total size of buffer */
  11 } my_source_mgr;
  12
  13 typedef my_source_mgr * my_src_ptr;
  14
  15 METHODDEF(void)
  16 quicktime_jpeg_init_source (j_decompress_ptr cinfo)
  17 {
  18   my_src_ptr src = (my_src_ptr) cinfo->src;
  19 }
  20
  21 METHODDEF(boolean)
  22 quicktime_jpeg_fill_input_buffer (j_decompress_ptr cinfo)
  23 {
  24   my_src_ptr src = (my_src_ptr) cinfo->src;
  25
  26   src->buffer[0] = (JOCTET) 0xFF;
  27   src->buffer[1] = (JOCTET) JPEG_EOI;
  28   src->pub.next_input_byte = src->buffer;
  29   src->pub.bytes_in_buffer = 2;
  30
  31   return TRUE;
  32 }
  33
  34
  35 METHODDEF(void)
  36 quicktime_jpeg_skip_input_data (j_decompress_ptr cinfo, long num_bytes)
  37 {
  38         my_src_ptr src = (my_src_ptr) cinfo->src;
  39
  40         src->pub.next_input_byte += (size_t) num_bytes;
  41         src->pub.bytes_in_buffer -= (size_t) num_bytes;
  42 }
  43
  44
  45 METHODDEF(void)
  46 quicktime_jpeg_term_source (j_decompress_ptr cinfo)
  47 {
  48 }
  49
  50 GLOBAL(void)
  51 jpeg_buffer_src (j_decompress_ptr cinfo, unsigned char *buffer, long bytes)
  52 {
  53   my_src_ptr src;
  54
  55   if (cinfo->src == NULL) {     /* first time for this JPEG object? */
  56     cinfo->src = (struct jpeg_source_mgr *)
  57       (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
  58                                   sizeof(my_source_mgr));
  59     src = (my_src_ptr) cinfo->src;
  60   }
  61
  62   src = (my_src_ptr) cinfo->src;
  63   src->pub.init_source = quicktime_jpeg_init_source;
  64   src->pub.fill_input_buffer = quicktime_jpeg_fill_input_buffer;
  65   src->pub.skip_input_data = quicktime_jpeg_skip_input_data;
  66   src->pub.resync_to_restart = jpeg_resync_to_restart; /* use default method */
  67   src->pub.term_source = quicktime_jpeg_term_source;
  68   src->pub.bytes_in_buffer = bytes;
  69   src->pub.next_input_byte = buffer;
  70   src->buffer = buffer;
  71   src->bytes = bytes;
  72 }