src/lib/doslib/ext/flac/ogg_helper.c

   1 /* libFLAC - Free Lossless Audio Codec
   2  * Copyright (C) 2004,2005,2006,2007  Josh Coalson
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * - Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * - Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * - Neither the name of the Xiph.org Foundation nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #if HAVE_CONFIG_H
  33 #  include "config.h"
  34 #endif
  35
  36 #include <stdlib.h> /* for malloc() */
  37 #include <string.h> /* for memcmp(), memcpy() */
  38 #include "flac/assert.h"
  39 #include "share/alloc.h"
  40 #include "private/ogg_helper.h"
  41 #include "protected/stream_encoder.h"
  42
  43
  44 static FLAC__bool full_read_(FLAC__StreamEncoder *encoder, FLAC__byte *buffer, size_t bytes, FLAC__StreamEncoderReadCallback read_callback, void *client_data)
  45 {
  46         while(bytes > 0) {
  47                 size_t bytes_read = bytes;
  48                 switch(read_callback(encoder, buffer, &bytes_read, client_data)) {
  49                         case FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE:
  50                                 bytes -= bytes_read;
  51                                 buffer += bytes_read;
  52                                 break;
  53                         case FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM:
  54                                 if(bytes_read == 0) {
  55                                         encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
  56                                         return false;
  57                                 }
  58                                 bytes -= bytes_read;
  59                                 buffer += bytes_read;
  60                                 break;
  61                         case FLAC__STREAM_ENCODER_READ_STATUS_ABORT:
  62                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
  63                                 return false;
  64                         case FLAC__STREAM_ENCODER_READ_STATUS_UNSUPPORTED:
  65                                 return false;
  66                         default:
  67                                 /* double protection: */
  68                                 FLAC__ASSERT(0);
  69                                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
  70                                 return false;
  71                 }
  72         }
  73
  74         return true;
  75 }
  76
  77 void simple_ogg_page__init(ogg_page *page)
  78 {
  79         page->header = 0;
  80         page->header_len = 0;
  81         page->body = 0;
  82         page->body_len = 0;
  83 }
  84
  85 void simple_ogg_page__clear(ogg_page *page)
  86 {
  87         if(page->header)
  88                 free(page->header);
  89         if(page->body)
  90                 free(page->body);
  91         simple_ogg_page__init(page);
  92 }
  93
  94 FLAC__bool simple_ogg_page__get_at(FLAC__StreamEncoder *encoder, FLAC__uint64 position, ogg_page *page, FLAC__StreamEncoderSeekCallback seek_callback, FLAC__StreamEncoderReadCallback read_callback, void *client_data)
  95 {
  96         static const unsigned OGG_HEADER_FIXED_PORTION_LEN = 27;
  97         static const unsigned OGG_MAX_HEADER_LEN = 27/*OGG_HEADER_FIXED_PORTION_LEN*/ + 255;
  98         FLAC__byte crc[4];
  99         FLAC__StreamEncoderSeekStatus seek_status;
 100
 101         FLAC__ASSERT(page->header == 0);
 102         FLAC__ASSERT(page->header_len == 0);
 103         FLAC__ASSERT(page->body == 0);
 104         FLAC__ASSERT(page->body_len == 0);
 105
 106         /* move the stream pointer to the supposed beginning of the page */
 107         if(0 == seek_callback)
 108                 return false;
 109         if((seek_status = seek_callback((FLAC__StreamEncoder*)encoder, position, client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
 110                 if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
 111                         encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
 112                 return false;
 113         }
 114
 115         /* allocate space for the page header */
 116         if(0 == (page->header = (unsigned char *)safe_malloc_(OGG_MAX_HEADER_LEN))) {
 117                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 118                 return false;
 119         }
 120
 121         /* read in the fixed part of the page header (up to but not including
 122          * the segment table */
 123         if(!full_read_(encoder, page->header, OGG_HEADER_FIXED_PORTION_LEN, read_callback, client_data))
 124                 return false;
 125
 126         page->header_len = OGG_HEADER_FIXED_PORTION_LEN + page->header[26];
 127
 128         /* check to see if it's a correct, "simple" page (one packet only) */
 129         if(
 130                 memcmp(page->header, "OggS", 4) ||               /* doesn't start with OggS */
 131                 (page->header[5] & 0x01) ||                      /* continued packet */
 132                 memcmp(page->header+6, "\0\0\0\0\0\0\0\0", 8) || /* granulepos is non-zero */
 133                 page->header[26] == 0                            /* packet is 0-size */
 134         ) {
 135                 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
 136                 return false;
 137         }
 138
 139         /* read in the segment table */
 140         if(!full_read_(encoder, page->header + OGG_HEADER_FIXED_PORTION_LEN, page->header[26], read_callback, client_data))
 141                 return false;
 142
 143         {
 144                 unsigned i;
 145
 146                 /* check to see that it specifies a single packet */
 147                 for(i = 0; i < (unsigned)page->header[26] - 1; i++) {
 148                         if(page->header[i + OGG_HEADER_FIXED_PORTION_LEN] != 255) {
 149                                 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
 150                                 return false;
 151                         }
 152                 }
 153
 154                 page->body_len = 255 * i + page->header[i + OGG_HEADER_FIXED_PORTION_LEN];
 155         }
 156
 157         /* allocate space for the page body */
 158         if(0 == (page->body = (unsigned char *)safe_malloc_(page->body_len))) {
 159                 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR;
 160                 return false;
 161         }
 162
 163         /* read in the page body */
 164         if(!full_read_(encoder, page->body, page->body_len, read_callback, client_data))
 165                 return false;
 166
 167         /* check the CRC */
 168         memcpy(crc, page->header+22, 4);
 169         ogg_page_checksum_set(page);
 170         if(memcmp(crc, page->header+22, 4)) {
 171                 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR;
 172                 return false;
 173         }
 174
 175         return true;
 176 }
 177
 178 FLAC__bool simple_ogg_page__set_at(FLAC__StreamEncoder *encoder, FLAC__uint64 position, ogg_page *page, FLAC__StreamEncoderSeekCallback seek_callback, FLAC__StreamEncoderWriteCallback write_callback, void *client_data)
 179 {
 180         FLAC__StreamEncoderSeekStatus seek_status;
 181
 182         FLAC__ASSERT(page->header != 0);
 183         FLAC__ASSERT(page->header_len != 0);
 184         FLAC__ASSERT(page->body != 0);
 185         FLAC__ASSERT(page->body_len != 0);
 186
 187         /* move the stream pointer to the supposed beginning of the page */
 188         if(0 == seek_callback)
 189                 return false;
 190         if((seek_status = seek_callback((FLAC__StreamEncoder*)encoder, position, client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) {
 191                 if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR)
 192                         encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
 193                 return false;
 194         }
 195
 196         ogg_page_checksum_set(page);
 197
 198         /* re-write the page */
 199         if(write_callback((FLAC__StreamEncoder*)encoder, page->header, page->header_len, 0, 0, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
 200                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
 201                 return false;
 202         }
 203         if(write_callback((FLAC__StreamEncoder*)encoder, page->body, page->body_len, 0, 0, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) {
 204                 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR;
 205                 return false;
 206         }
 207
 208         return true;
 209 }