请教下，使用st提供的历程，libjpeg 库解码？？？

2019-07-21 00:17发布

本帖最后由 hpdell 于 2016-1-11 15:50 编辑

各位大侠们，使用st官网提供的libjpeg解码库时，程序运行到

typedef unsigned char JOCTET;          // 这个是libjpeg 库里面的原始定义

GLOBAL(void)
jpeg_stdio_src (j_decompress_ptr cinfo, FILE * infile)
{
  my_src_ptr src;

  /* The source object and input buffer are made permanent so that a series
* of JPEG images can be read from the same file by calling jpeg_stdio_src
* only before the first one.  (If we discarded the buffer at the end of
* one image, we'd likely lose the start of the next one.)
* This makes it unsafe to use this manager and a different source
* manager serially with the same JPEG object.  Caveat programmer.
*/
  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->buffer = (JOCTET *)                   // 程序运行此处时，程序跑飞了，不知是为何  ？？？？？？？？？？？？？？？
   (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
                              INPUT_BUF_SIZE * SIZEOF(JOCTET));
  }

  src = (my_src_ptr) 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; /* use default method */
  src->pub.term_source = term_source;
  src->infile = infile;
  src->pub.bytes_in_buffer = 0; /* forces fill_input_buffer on first read */
  src->pub.next_input_byte = NULL; /* until buffer loaded */
}

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