1 /* libFLAC - Free Lossless Audio Codec 2 * Copyright (C) 2004-2009 Josh Coalson 3 * Copyright (C) 2011-2016 Xiph.Org Foundation 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * - Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * - Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * - Neither the name of the Xiph.org Foundation nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifdef HAVE_CONFIG_H 34 # include <config.h> 35 #endif 36 37 #include <stdlib.h> /* for malloc() */ 38 #include <string.h> /* for memcmp(), memcpy() */ 39 #include "FLAC/assert.h" 40 #include "share/alloc.h" 41 #include "private/ogg_helper.h" 42 #include "protected/stream_encoder.h" 43 44 45 static FLAC__bool full_read_(FLAC__StreamEncoder *encoder, FLAC__byte *buffer, size_t bytes, FLAC__StreamEncoderReadCallback read_callback, void *client_data) 46 { 47 while(bytes > 0) { 48 size_t bytes_read = bytes; 49 switch(read_callback(encoder, buffer, &bytes_read, client_data)) { 50 case FLAC__STREAM_ENCODER_READ_STATUS_CONTINUE: 51 bytes -= bytes_read; 52 buffer += bytes_read; 53 break; 54 case FLAC__STREAM_ENCODER_READ_STATUS_END_OF_STREAM: 55 if(bytes_read == 0) { 56 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR; 57 return false; 58 } 59 bytes -= bytes_read; 60 buffer += bytes_read; 61 break; 62 case FLAC__STREAM_ENCODER_READ_STATUS_ABORT: 63 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR; 64 return false; 65 case FLAC__STREAM_ENCODER_READ_STATUS_UNSUPPORTED: 66 return false; 67 default: 68 /* double protection: */ 69 FLAC__ASSERT(0); 70 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR; 71 return false; 72 } 73 } 74 75 return true; 76 } 77 78 void simple_ogg_page__init(ogg_page *page) 79 { 80 page->header = 0; 81 page->header_len = 0; 82 page->body = 0; 83 page->body_len = 0; 84 } 85 86 void simple_ogg_page__clear(ogg_page *page) 87 { 88 if(page->header) 89 free(page->header); 90 if(page->body) 91 free(page->body); 92 simple_ogg_page__init(page); 93 } 94 95 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) 96 { 97 static const unsigned OGG_HEADER_FIXED_PORTION_LEN = 27; 98 static const unsigned OGG_MAX_HEADER_LEN = 27/*OGG_HEADER_FIXED_PORTION_LEN*/ + 255; 99 FLAC__byte crc[4]; 100 FLAC__StreamEncoderSeekStatus seek_status; 101 102 FLAC__ASSERT(page->header == 0); 103 FLAC__ASSERT(page->header_len == 0); 104 FLAC__ASSERT(page->body == 0); 105 FLAC__ASSERT(page->body_len == 0); 106 107 /* move the stream pointer to the supposed beginning of the page */ 108 if(0 == seek_callback) 109 return false; 110 if((seek_status = seek_callback((FLAC__StreamEncoder*)encoder, position, client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) { 111 if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR) 112 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR; 113 return false; 114 } 115 116 /* allocate space for the page header */ 117 if(0 == (page->header = safe_malloc_(OGG_MAX_HEADER_LEN))) { 118 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR; 119 return false; 120 } 121 122 /* read in the fixed part of the page header (up to but not including 123 * the segment table */ 124 if(!full_read_(encoder, page->header, OGG_HEADER_FIXED_PORTION_LEN, read_callback, client_data)) 125 return false; 126 127 page->header_len = OGG_HEADER_FIXED_PORTION_LEN + page->header[26]; 128 129 /* check to see if it's a correct, "simple" page (one packet only) */ 130 if( 131 memcmp(page->header, "OggS", 4) || /* doesn't start with OggS */ 132 (page->header[5] & 0x01) || /* continued packet */ 133 memcmp(page->header+6, "\0\0\0\0\0\0\0\0", 8) || /* granulepos is non-zero */ 134 page->header[26] == 0 /* packet is 0-size */ 135 ) { 136 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR; 137 return false; 138 } 139 140 /* read in the segment table */ 141 if(!full_read_(encoder, page->header + OGG_HEADER_FIXED_PORTION_LEN, page->header[26], read_callback, client_data)) 142 return false; 143 144 { 145 unsigned i; 146 147 /* check to see that it specifies a single packet */ 148 for(i = 0; i < (unsigned)page->header[26] - 1; i++) { 149 if(page->header[i + OGG_HEADER_FIXED_PORTION_LEN] != 255) { 150 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR; 151 return false; 152 } 153 } 154 155 page->body_len = 255 * i + page->header[i + OGG_HEADER_FIXED_PORTION_LEN]; 156 } 157 158 /* allocate space for the page body */ 159 if(0 == (page->body = safe_malloc_(page->body_len))) { 160 encoder->protected_->state = FLAC__STREAM_ENCODER_MEMORY_ALLOCATION_ERROR; 161 return false; 162 } 163 164 /* read in the page body */ 165 if(!full_read_(encoder, page->body, page->body_len, read_callback, client_data)) 166 return false; 167 168 /* check the CRC */ 169 memcpy(crc, page->header+22, 4); 170 ogg_page_checksum_set(page); 171 if(memcmp(crc, page->header+22, 4)) { 172 encoder->protected_->state = FLAC__STREAM_ENCODER_OGG_ERROR; 173 return false; 174 } 175 176 return true; 177 } 178 179 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) 180 { 181 FLAC__StreamEncoderSeekStatus seek_status; 182 183 FLAC__ASSERT(page->header != 0); 184 FLAC__ASSERT(page->header_len != 0); 185 FLAC__ASSERT(page->body != 0); 186 FLAC__ASSERT(page->body_len != 0); 187 188 /* move the stream pointer to the supposed beginning of the page */ 189 if(0 == seek_callback) 190 return false; 191 if((seek_status = seek_callback((FLAC__StreamEncoder*)encoder, position, client_data)) != FLAC__STREAM_ENCODER_SEEK_STATUS_OK) { 192 if(seek_status == FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR) 193 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR; 194 return false; 195 } 196 197 ogg_page_checksum_set(page); 198 199 /* re-write the page */ 200 if(write_callback((FLAC__StreamEncoder*)encoder, page->header, page->header_len, 0, 0, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) { 201 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR; 202 return false; 203 } 204 if(write_callback((FLAC__StreamEncoder*)encoder, page->body, page->body_len, 0, 0, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) { 205 encoder->protected_->state = FLAC__STREAM_ENCODER_CLIENT_ERROR; 206 return false; 207 } 208 209 return true; 210 } 211
