1/* 2 3Copyright (c) 2002-2003, Marcin 'Shard' Konicki 4All rights reserved. 5 6Redistribution and use in source and binary forms, with or without 7modification, are permitted provided that the following conditions are met: 8 9 * Redistributions of source code must retain the above copyright notice, 10 this list of conditions and the following disclaimer. 11 * Redistributions in binary form must reproduce the above copyright notice, 12 this list of conditions and the following disclaimer in the documentation and/or 13 other materials provided with the distribution. 14 * Name "Marcin Konicki", "Shard" or any combination of them, 15 must not be used to endorse or promote products derived from this 16 software without specific prior written permission from Marcin Konicki. 17 18THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 19ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 22BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 23OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 25OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 27OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 28EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30*/ 31 32 33/* 34 Modified jdatadst.c from libjpeg 35 to use BPoistionIO instead of FILE 36*/ 37 38 39// Be Headers 40#include <DataIO.h> 41#include <stdio.h> 42 43/* this is not a core library module, so it doesn't define JPEG_INTERNALS */ 44#include <jpeglib.h> 45#include <jerror.h> 46 47// instead of including jinclude - thx to it translator can be compiled 48// without sources to jpeglib 49#define SIZEOF(object) ((size_t) sizeof(object)) 50 51/* Expanded data destination object for stdio output */ 52 53typedef struct { 54 struct jpeg_destination_mgr pub; /* public fields */ 55 56 BPositionIO * outfile; /* target stream */ 57 JOCTET * buffer; /* start of buffer */ 58} be_destination_mgr; 59 60typedef be_destination_mgr * be_dest_ptr; 61 62#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */ 63 64 65/* 66 * Initialize destination --- called by jpeg_start_compress 67 * before any data is actually written. 68 */ 69 70METHODDEF(void) 71be_init_destination (j_compress_ptr cinfo) 72{ 73 be_dest_ptr dest = (be_dest_ptr) cinfo->dest; 74 75 /* Allocate the output buffer --- it will be released when done with image */ 76 dest->buffer = (JOCTET *) 77 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, (OUTPUT_BUF_SIZE * SIZEOF(JOCTET))); 78 79 dest->pub.next_output_byte = dest->buffer; 80 dest->pub.free_in_buffer = OUTPUT_BUF_SIZE; 81} 82 83 84/* 85 * Empty the output buffer --- called whenever buffer fills up. 86 * 87 * In typical applications, this should write the entire output buffer 88 * (ignoring the current state of next_output_byte & free_in_buffer), 89 * reset the pointer & count to the start of the buffer, and return TRUE 90 * indicating that the buffer has been dumped. 91 * 92 * In applications that need to be able to suspend compression due to output 93 * overrun, a FALSE return indicates that the buffer cannot be emptied now. 94 * In this situation, the compressor will return to its caller (possibly with 95 * an indication that it has not accepted all the supplied scanlines). The 96 * application should resume compression after it has made more room in the 97 * output buffer. Note that there are substantial restrictions on the use of 98 * suspension --- see the documentation. 99 * 100 * When suspending, the compressor will back up to a convenient restart point 101 * (typically the start of the current MCU). next_output_byte & free_in_buffer 102 * indicate where the restart point will be if the current call returns FALSE. 103 * Data beyond this point will be regenerated after resumption, so do not 104 * write it out when emptying the buffer externally. 105 */ 106 107METHODDEF(boolean) 108be_empty_output_buffer (j_compress_ptr cinfo) 109{ 110 be_dest_ptr dest = (be_dest_ptr) cinfo->dest; 111 112 if (dest->outfile->Write(dest->buffer, OUTPUT_BUF_SIZE) != (ssize_t) OUTPUT_BUF_SIZE) 113 ERREXIT(cinfo, JERR_FILE_WRITE); 114 115 dest->pub.next_output_byte = dest->buffer; 116 dest->pub.free_in_buffer = OUTPUT_BUF_SIZE; 117 118 return TRUE; 119} 120 121 122/* 123 * Terminate destination --- called by jpeg_finish_compress 124 * after all data has been written. Usually needs to flush buffer. 125 * 126 * NB: *not* called by jpeg_abort or jpeg_destroy; surrounding 127 * application must deal with any cleanup that should happen even 128 * for error exit. 129 */ 130 131METHODDEF(void) 132be_term_destination (j_compress_ptr cinfo) 133{ 134 be_dest_ptr dest = (be_dest_ptr) cinfo->dest; 135 size_t datacount = OUTPUT_BUF_SIZE - dest->pub.free_in_buffer; 136 137 /* Write any data remaining in the buffer */ 138 if (datacount > 0) { 139 if (dest->outfile->Write(dest->buffer, datacount) != (ssize_t) datacount) 140 ERREXIT(cinfo, JERR_FILE_WRITE); 141 } 142} 143 144 145/* 146 * Prepare for output to a stdio stream. 147 * The caller must have already opened the stream, and is responsible 148 * for closing it after finishing compression. 149 */ 150 151GLOBAL(void) 152be_jpeg_stdio_dest (j_compress_ptr cinfo, BPositionIO * outfile) 153{ 154 be_dest_ptr dest; 155 156 /* The destination object is made permanent so that multiple JPEG images 157 * can be written to the same file without re-executing jpeg_stdio_dest. 158 * This makes it dangerous to use this manager and a different destination 159 * manager serially with the same JPEG object, because their private object 160 * sizes may be different. Caveat programmer. 161 */ 162 if (cinfo->dest == NULL) { /* first time for this JPEG object? */ 163 cinfo->dest = (struct jpeg_destination_mgr *) 164 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, SIZEOF(be_destination_mgr)); 165 } 166 167 dest = (be_dest_ptr) cinfo->dest; 168 dest->pub.init_destination = be_init_destination; 169 dest->pub.empty_output_buffer = be_empty_output_buffer; 170 dest->pub.term_destination = be_term_destination; 171 dest->outfile = outfile; 172} 173