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/*
* jdatadst-tj.c
*
* This file was part of the Independent JPEG Group's software:
* Copyright (C) 1994-1996, Thomas G. Lane.
* Modified 2009-2012 by Guido Vollbeding.
* libjpeg-turbo Modifications:
* Copyright (C) 2011, 2014, 2016, 2019, 2022, D. R. Commander.
* For conditions of distribution and use, see the accompanying README.ijg
* file.
*
* This file contains compression data destination routines for the case of
* emitting JPEG data to memory or to a file (or any stdio stream).
* While these routines are sufficient for most applications,
* some will want to use a different destination manager.
* IMPORTANT: we assume that fwrite() will correctly transcribe an array of
* JOCTETs into 8-bit-wide elements on external storage. If char is wider
* than 8 bits on your machine, you may need to do some tweaking.
*/
/* this is not a core library module, so it doesn't define JPEG_INTERNALS */
#include "jinclude.h"
#include "jpeglib.h"
#include "jerror.h"
void jpeg_mem_dest_tj(j_compress_ptr cinfo, unsigned char **outbuffer,
unsigned long *outsize, boolean alloc);
#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
/* Expanded data destination object for memory output */
typedef struct {
struct jpeg_destination_mgr pub; /* public fields */
unsigned char **outbuffer; /* target buffer */
unsigned long *outsize;
unsigned char *newbuffer; /* newly allocated buffer */
JOCTET *buffer; /* start of buffer */
size_t bufsize;
boolean alloc;
} my_mem_destination_mgr;
typedef my_mem_destination_mgr *my_mem_dest_ptr;
/*
* Initialize destination --- called by jpeg_start_compress
* before any data is actually written.
*/
METHODDEF(void)
init_mem_destination(j_compress_ptr cinfo)
{
/* no work necessary here */
}
/*
* Empty the output buffer --- called whenever buffer fills up.
*
* In typical applications, this should write the entire output buffer
* (ignoring the current state of next_output_byte & free_in_buffer),
* reset the pointer & count to the start of the buffer, and return TRUE
* indicating that the buffer has been dumped.
*
* In applications that need to be able to suspend compression due to output
* overrun, a FALSE return indicates that the buffer cannot be emptied now.
* In this situation, the compressor will return to its caller (possibly with
* an indication that it has not accepted all the supplied scanlines). The
* application should resume compression after it has made more room in the
* output buffer. Note that there are substantial restrictions on the use of
* suspension --- see the documentation.
*
* When suspending, the compressor will back up to a convenient restart point
* (typically the start of the current MCU). next_output_byte & free_in_buffer
* indicate where the restart point will be if the current call returns FALSE.
* Data beyond this point will be regenerated after resumption, so do not
* write it out when emptying the buffer externally.
*/
METHODDEF(boolean)
empty_mem_output_buffer(j_compress_ptr cinfo)
{
size_t nextsize;
JOCTET *nextbuffer;
my_mem_dest_ptr dest = (my_mem_dest_ptr)cinfo->dest;
if (!dest->alloc) ERREXIT(cinfo, JERR_BUFFER_SIZE);
/* Try to allocate new buffer with double size */
nextsize = dest->bufsize * 2;
nextbuffer = (JOCTET *)malloc(nextsize);
if (nextbuffer == NULL)
ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
memcpy(nextbuffer, dest->buffer, dest->bufsize);
free(dest->newbuffer);
dest->newbuffer = nextbuffer;
dest->pub.next_output_byte = nextbuffer + dest->bufsize;
dest->pub.free_in_buffer = dest->bufsize;
dest->buffer = nextbuffer;
dest->bufsize = nextsize;
return TRUE;
}
/*
* Terminate destination --- called by jpeg_finish_compress
* after all data has been written. Usually needs to flush buffer.
*
* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
* application must deal with any cleanup that should happen even
* for error exit.
*/
METHODDEF(void)
term_mem_destination(j_compress_ptr cinfo)
{
my_mem_dest_ptr dest = (my_mem_dest_ptr)cinfo->dest;
if (dest->alloc) *dest->outbuffer = dest->buffer;
*dest->outsize = (unsigned long)(dest->bufsize - dest->pub.free_in_buffer);
}
/*
* Prepare for output to a memory buffer.
* The caller may supply an own initial buffer with appropriate size.
* Otherwise, or when the actual data output exceeds the given size,
* the library adapts the buffer size as necessary.
* The standard library functions malloc/free are used for allocating
* larger memory, so the buffer is available to the application after
* finishing compression, and then the application is responsible for
* freeing the requested memory.
*/
GLOBAL(void)
jpeg_mem_dest_tj(j_compress_ptr cinfo, unsigned char **outbuffer,
unsigned long *outsize, boolean alloc)
{
boolean reused = FALSE;
my_mem_dest_ptr dest;
if (outbuffer == NULL || outsize == NULL) /* sanity check */
ERREXIT(cinfo, JERR_BUFFER_SIZE);
/* The destination object is made permanent so that multiple JPEG images
* can be written to the same buffer without re-executing jpeg_mem_dest.
*/
if (cinfo->dest == NULL) { /* first time for this JPEG object? */
cinfo->dest = (struct jpeg_destination_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_PERMANENT,
sizeof(my_mem_destination_mgr));
dest = (my_mem_dest_ptr)cinfo->dest;
dest->newbuffer = NULL;
dest->buffer = NULL;
} else if (cinfo->dest->init_destination != init_mem_destination) {
/* It is unsafe to reuse the existing destination manager unless it was
* created by this function.
*/
ERREXIT(cinfo, JERR_BUFFER_SIZE);
}
dest = (my_mem_dest_ptr)cinfo->dest;
dest->pub.init_destination = init_mem_destination;
dest->pub.empty_output_buffer = empty_mem_output_buffer;
dest->pub.term_destination = term_mem_destination;
if (dest->buffer == *outbuffer && *outbuffer != NULL && alloc)
reused = TRUE;
dest->outbuffer = outbuffer;
dest->outsize = outsize;
dest->alloc = alloc;
if (*outbuffer == NULL || *outsize == 0) {
if (alloc) {
/* Allocate initial buffer */
dest->newbuffer = *outbuffer = (unsigned char *)malloc(OUTPUT_BUF_SIZE);
if (dest->newbuffer == NULL)
ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
*outsize = OUTPUT_BUF_SIZE;
} else
ERREXIT(cinfo, JERR_BUFFER_SIZE);
}
dest->pub.next_output_byte = dest->buffer = *outbuffer;
if (!reused)
dest->bufsize = *outsize;
dest->pub.free_in_buffer = dest->bufsize;
}
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