The Tor Browser: comparison media/libjpeg/jdatadst.c

--1:000000000000
+:70e9c096aaee
+/*
+* jdatadst.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) 2013, D. R. Commander.
+* For conditions of distribution and use, see the accompanying README 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"
+#ifndef HAVE_STDLIB_H		/* <stdlib.h> should declare malloc(),free() */
+extern void * malloc JPP((size_t size));
+extern void free JPP((void *ptr));
+#endif
+/* Expanded data destination object for stdio output */
+typedef struct {
+struct jpeg_destination_mgr pub; /* public fields */
+FILE * outfile;		/* target stream */
+JOCTET * buffer;		/* start of buffer */
+} my_destination_mgr;
+typedef my_destination_mgr * my_dest_ptr;
+#define OUTPUT_BUF_SIZE  4096	/* choose an efficiently fwrite'able size */
+#if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
+/* 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;
+} my_mem_destination_mgr;
+typedef my_mem_destination_mgr * my_mem_dest_ptr;
+#endif
+/*
+* Initialize destination --- called by jpeg_start_compress
+* before any data is actually written.
+*/
+METHODDEF(void)
+init_destination (j_compress_ptr cinfo)
+{
+my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
+/* Allocate the output buffer --- it will be released when done with image */
+dest->buffer = (JOCTET *)
+(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
+				  OUTPUT_BUF_SIZE * SIZEOF(JOCTET));
+dest->pub.next_output_byte = dest->buffer;
+dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
+}
+#if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
+METHODDEF(void)
+init_mem_destination (j_compress_ptr cinfo)
+{
+/* no work necessary here */
+}
+#endif
+/*
+* 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_output_buffer (j_compress_ptr cinfo)
+{
+my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
+if (JFWRITE(dest->outfile, dest->buffer, OUTPUT_BUF_SIZE) !=
+(size_t) OUTPUT_BUF_SIZE)
+ERREXIT(cinfo, JERR_FILE_WRITE);
+dest->pub.next_output_byte = dest->buffer;
+dest->pub.free_in_buffer = OUTPUT_BUF_SIZE;
+return TRUE;
+}
+#if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
+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;
+/* 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);
+MEMCOPY(nextbuffer, dest->buffer, dest->bufsize);
+if (dest->newbuffer != NULL)
+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;
+}
+#endif
+/*
+* 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_destination (j_compress_ptr cinfo)
+{
+my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
+size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer;
+/* Write any data remaining in the buffer */
+if (datacount > 0) {
+if (JFWRITE(dest->outfile, dest->buffer, datacount) != datacount)
+ERREXIT(cinfo, JERR_FILE_WRITE);
+}
+fflush(dest->outfile);
+/* Make sure we wrote the output file OK */
+if (ferror(dest->outfile))
+ERREXIT(cinfo, JERR_FILE_WRITE);
+}
+#if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
+METHODDEF(void)
+term_mem_destination (j_compress_ptr cinfo)
+{
+my_mem_dest_ptr dest = (my_mem_dest_ptr) cinfo->dest;
+*dest->outbuffer = dest->buffer;
+*dest->outsize = (unsigned long)(dest->bufsize - dest->pub.free_in_buffer);
+}
+#endif
+/*
+* Prepare for output to a stdio stream.
+* The caller must have already opened the stream, and is responsible
+* for closing it after finishing compression.
+*/
+GLOBAL(void)
+jpeg_stdio_dest (j_compress_ptr cinfo, FILE * outfile)
+{
+my_dest_ptr dest;
+/* The destination object is made permanent so that multiple JPEG images
+* can be written to the same file without re-executing jpeg_stdio_dest.
+* This makes it dangerous to use this manager and a different destination
+* manager serially with the same JPEG object, because their private object
+* sizes may be different.  Caveat programmer.
+*/
+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_destination_mgr));
+}
+dest = (my_dest_ptr) cinfo->dest;
+dest->pub.init_destination = init_destination;
+dest->pub.empty_output_buffer = empty_output_buffer;
+dest->pub.term_destination = term_destination;
+dest->outfile = outfile;
+}
+#if JPEG_LIB_VERSION >= 80 || defined(MEM_SRCDST_SUPPORTED)
+/*
+* 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 (j_compress_ptr cinfo,
+	       unsigned char ** outbuffer, unsigned long * outsize)
+{
+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->pub.init_destination = init_mem_destination;
+dest->pub.empty_output_buffer = empty_mem_output_buffer;
+dest->pub.term_destination = term_mem_destination;
+dest->outbuffer = outbuffer;
+dest->outsize = outsize;
+dest->newbuffer = NULL;
+if (*outbuffer == NULL || *outsize == 0) {
+/* 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;
+}
+dest->pub.next_output_byte = dest->buffer = *outbuffer;
+dest->pub.free_in_buffer = dest->bufsize = *outsize;
+}
+#endif

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comparison: media/libjpeg/jdatadst.c

media/libjpeg/jdatadst.c