ossimJpegMemSrc12.cpp File Reference

#include "ossimJpegMemSrc12.h"
#include <cstdio>
#include <csetjmp>
#include <jpeg12/jpeglib.h>
#include <jpeg12/jerror.h>

Go to the source code of this file.

Classes
struct	ossimJpegSourceMgr12
	jpeg library includes missing dependent includes. More...

Typedefs
typedef ossimJpegSourceMgr12 *	ossimJpegSourceMgrPtr12

Functions
void	init_source12 (j12_decompress_ptr)
boolean	fill_input_buffer12 (j12_decompress_ptr cinfo)
void	skip_input_data12 (j12_decompress_ptr cinfo, long num_bytes)
void	term_source12 (j12_decompress_ptr)
void	ossimJpegMemorySrc12 (j12_decompress_ptr cinfo, const ossim_uint8 *buffer, std::size_t bufsize)

Typedef Documentation

ossimJpegSourceMgrPtr12

typedef ossimJpegSourceMgr12* ossimJpegSourceMgrPtr12

Definition at line 50 of file ossimJpegMemSrc12.cpp.

Function Documentation

fill_input_buffer12()

boolean fill_input_buffer12

(

j12_decompress_ptr

cinfo

)

Definition at line 79 of file ossimJpegMemSrc12.cpp.

References ossimJpegSourceMgr12::eoi_buffer, ossimJpegSourceMgr12::pub, and TRUE.

Referenced by ossimJpegMemorySrc12(), and skip_input_data12().

{
   ossimJpegSourceMgrPtr12 src = (ossimJpegSourceMgrPtr12) cinfo->src;

   WARNMS(cinfo, JWRN_JPEG_EOF);

   /* Create a fake EOI marker */
   src->eoi_buffer[0] = (JOCTET) 0xFF;
   src->eoi_buffer[1] = (JOCTET) JPEG_EOI;
   src->pub.next_input_byte = src->eoi_buffer;
   src->pub.bytes_in_buffer = 2;
   
   return TRUE;
}

init_source12()

void init_source12

(

j12_decompress_ptr

)

Definition at line 58 of file ossimJpegMemSrc12.cpp.

Referenced by ossimJpegMemorySrc12().

{
  /* No work, since jpeg_memory_src set up the buffer pointer and count.
   * Indeed, if we want to read multiple JPEG images from one buffer,
   * this *must* not do anything to the pointer.
   */
}

ossimJpegMemorySrc12()

void ossimJpegMemorySrc12	(	j12_decompress_ptr	cinfo,
		const ossim_uint8 *	buffer,
		std::size_t	bufsize
	)

Definition at line 149 of file ossimJpegMemSrc12.cpp.

References fill_input_buffer12(), init_source12(), ossimJpegSourceMgr12::pub, skip_input_data12(), and term_source12().

{
   ossimJpegSourceMgrPtr12 src;
   
   /* The source object is made permanent so that a series of JPEG images
    * can be read from a single buffer by calling jpeg_memory_src
    * only before the first 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 jpeg12_source_mgr *)
         (*cinfo->mem->alloc_small) ((j12_common_ptr) cinfo, JPOOL_PERMANENT,
                                     sizeof(ossimJpegSourceMgr12));
   }
   
   src = (ossimJpegSourceMgrPtr12) cinfo->src;
   src->pub.init_source = init_source12;
   src->pub.fill_input_buffer = fill_input_buffer12;
   src->pub.skip_input_data = skip_input_data12;
   src->pub.resync_to_restart = jpeg12_resync_to_restart; /* use default method */
   src->pub.term_source = term_source12;
   
   src->pub.next_input_byte = buffer;
   src->pub.bytes_in_buffer = bufsize;
}

skip_input_data12()

void skip_input_data12	(	j12_decompress_ptr	cinfo,
		long	num_bytes
	)

Definition at line 103 of file ossimJpegMemSrc12.cpp.

References fill_input_buffer12(), if(), and ossimJpegSourceMgr12::pub.

Referenced by ossimJpegMemorySrc12().

{
   ossimJpegSourceMgrPtr12 src = (ossimJpegSourceMgrPtr12) cinfo->src;
   
   if (num_bytes > 0)
   {
      while (num_bytes > (long) src->pub.bytes_in_buffer)
      {
         num_bytes -= (long) src->pub.bytes_in_buffer;
         (void) fill_input_buffer12(cinfo);
         /* note we assume that fill_input_buffer will never return FALSE,
          * so suspension need not be handled.
          */
      }
      src->pub.next_input_byte += (size_t) num_bytes;
      src->pub.bytes_in_buffer -= (size_t) num_bytes;
   }
}

term_source12()

void term_source12

(

j12_decompress_ptr

)

Definition at line 140 of file ossimJpegMemSrc12.cpp.

Referenced by ossimJpegMemorySrc12().

{
  /* no work necessary here */
}