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 } 210
