Josh Coalson | e6d52b0 | 2004-01-17 03:52:59 +0000 | [diff] [blame] | 1 | /* libOggFLAC - Free Lossless Audio Codec + Ogg library |
Josh Coalson | 9564390 | 2004-01-17 04:14:43 +0000 | [diff] [blame] | 2 | * Copyright (C) 2004 Josh Coalson |
Josh Coalson | e6d52b0 | 2004-01-17 03:52:59 +0000 | [diff] [blame] | 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 | #include <stdlib.h> /* for malloc() */ |
| 33 | #include <string.h> /* for memcmp(), memcpy() */ |
| 34 | #include "FLAC/assert.h" |
| 35 | #include "private/ogg_helper.h" |
| 36 | #include "protected/seekable_stream_encoder.h" |
| 37 | |
| 38 | |
| 39 | static FLAC__bool full_read_(OggFLAC__SeekableStreamEncoder *encoder, FLAC__byte *buffer, unsigned bytes, OggFLAC__SeekableStreamEncoderReadCallback read_callback, void *client_data) |
| 40 | { |
| 41 | while(bytes > 0) { |
| 42 | unsigned bytes_read = bytes; |
| 43 | switch(read_callback(encoder, buffer, &bytes_read, client_data)) { |
| 44 | case OggFLAC__SEEKABLE_STREAM_ENCODER_READ_STATUS_CONTINUE: |
| 45 | bytes -= bytes_read; |
| 46 | buffer += bytes_read; |
| 47 | break; |
| 48 | case OggFLAC__SEEKABLE_STREAM_ENCODER_READ_STATUS_END_OF_STREAM: |
| 49 | if(bytes_read == 0) { |
| 50 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_OGG_ERROR; |
| 51 | return false; |
| 52 | } |
| 53 | bytes -= bytes_read; |
| 54 | buffer += bytes_read; |
| 55 | break; |
| 56 | case OggFLAC__SEEKABLE_STREAM_ENCODER_READ_STATUS_ABORT: |
| 57 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_READ_ERROR; |
| 58 | return false; |
| 59 | default: |
| 60 | /* double protection: */ |
| 61 | FLAC__ASSERT(0); |
| 62 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_READ_ERROR; |
| 63 | return false; |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | return true; |
| 68 | } |
| 69 | |
| 70 | void simple_ogg_page__init(ogg_page *page) |
| 71 | { |
| 72 | page->header = 0; |
| 73 | page->header_len = 0; |
| 74 | page->body = 0; |
| 75 | page->body_len = 0; |
| 76 | } |
| 77 | |
| 78 | void simple_ogg_page__clear(ogg_page *page) |
| 79 | { |
| 80 | if(page->header) |
| 81 | free(page->header); |
| 82 | if(page->body) |
| 83 | free(page->body); |
| 84 | simple_ogg_page__init(page); |
| 85 | } |
| 86 | |
| 87 | FLAC__bool simple_ogg_page__get_at(OggFLAC__SeekableStreamEncoder *encoder, FLAC__uint64 position, ogg_page *page, OggFLAC__SeekableStreamEncoderSeekCallback seek_callback, OggFLAC__SeekableStreamEncoderReadCallback read_callback, void *client_data) |
| 88 | { |
| 89 | static const unsigned OGG_HEADER_FIXED_PORTION_LEN = 27; |
| 90 | static const unsigned OGG_MAX_HEADER_LEN = 27/*OGG_HEADER_FIXED_PORTION_LEN*/ + 255; |
| 91 | FLAC__byte crc[4]; |
| 92 | |
Josh Coalson | f3d6429 | 2004-01-18 00:03:48 +0000 | [diff] [blame^] | 93 | FLAC__ASSERT(page->header == 0); |
| 94 | FLAC__ASSERT(page->header_len == 0); |
| 95 | FLAC__ASSERT(page->body == 0); |
| 96 | FLAC__ASSERT(page->body_len == 0); |
Josh Coalson | e6d52b0 | 2004-01-17 03:52:59 +0000 | [diff] [blame] | 97 | |
| 98 | /* move the stream pointer to the supposed beginning of the page */ |
| 99 | if(seek_callback(encoder, position, client_data) != FLAC__SEEKABLE_STREAM_ENCODER_SEEK_STATUS_OK) { |
| 100 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_SEEK_ERROR; |
| 101 | return false; |
| 102 | } |
| 103 | |
| 104 | /* allocate space for the page header */ |
| 105 | if(0 == (page->header = malloc(OGG_MAX_HEADER_LEN))) { |
| 106 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_MEMORY_ALLOCATION_ERROR; |
| 107 | return false; |
| 108 | } |
| 109 | |
| 110 | /* read in the fixed part of the page header (up to but not including |
| 111 | * the segment table */ |
| 112 | if(!full_read_(encoder, page->header, OGG_HEADER_FIXED_PORTION_LEN, read_callback, client_data)) |
| 113 | return false; |
| 114 | |
| 115 | page->header_len = OGG_HEADER_FIXED_PORTION_LEN + page->header[26]; |
| 116 | |
| 117 | /* check to see if it's a correct, "simple" page (one packet only) */ |
| 118 | if( |
| 119 | memcmp(page->header, "OggS", 4) || /* doesn't start with OggS */ |
| 120 | (page->header[5] & 0x01) || /* continued packet */ |
| 121 | memcmp(page->header+6, "\0\0\0\0\0\0\0\0", 8) || /* granulepos is non-zero */ |
| 122 | page->header[26] == 0 /* packet is 0-size */ |
| 123 | ) { |
| 124 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_OGG_ERROR; |
| 125 | return false; |
| 126 | } |
| 127 | |
| 128 | /* read in the segment table */ |
| 129 | if(!full_read_(encoder, page->header + OGG_HEADER_FIXED_PORTION_LEN, page->header[26], read_callback, client_data)) |
| 130 | return false; |
| 131 | |
| 132 | { |
| 133 | unsigned i; |
| 134 | |
| 135 | /* check to see that it specifies a single packet */ |
| 136 | for(i = 0; i < (unsigned)page->header[26] - 1; i++) { |
| 137 | if(page->header[i + OGG_HEADER_FIXED_PORTION_LEN] != 255) { |
| 138 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_OGG_ERROR; |
| 139 | return false; |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | page->body_len = 255 * i + page->header[i]; |
| 144 | } |
| 145 | |
| 146 | /* allocate space for the page body */ |
| 147 | if(0 == (page->body = malloc(page->body_len))) { |
| 148 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_MEMORY_ALLOCATION_ERROR; |
| 149 | return false; |
| 150 | } |
| 151 | |
| 152 | /* read in the page body */ |
| 153 | if(!full_read_(encoder, page->body, page->body_len, read_callback, client_data)) |
| 154 | return false; |
| 155 | |
| 156 | /* check the CRC */ |
| 157 | memcpy(crc, page->header+22, 4); |
| 158 | ogg_page_checksum_set(page); |
| 159 | if(memcmp(crc, page->header+22, 4)) { |
| 160 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_OGG_ERROR; |
| 161 | return false; |
| 162 | } |
| 163 | |
| 164 | return true; |
| 165 | } |
| 166 | |
| 167 | FLAC__bool simple_ogg_page__set_at(OggFLAC__SeekableStreamEncoder *encoder, FLAC__uint64 position, ogg_page *page, OggFLAC__SeekableStreamEncoderSeekCallback seek_callback, OggFLAC__SeekableStreamEncoderWriteCallback write_callback, void *client_data) |
| 168 | { |
| 169 | FLAC__ASSERT(page->header != 0); |
| 170 | FLAC__ASSERT(page->header_len != 0); |
| 171 | FLAC__ASSERT(page->body != 0); |
| 172 | FLAC__ASSERT(page->body_len != 0); |
| 173 | |
| 174 | /* move the stream pointer to the supposed beginning of the page */ |
| 175 | if(seek_callback(encoder, position, client_data) != FLAC__SEEKABLE_STREAM_ENCODER_SEEK_STATUS_OK) { |
| 176 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_SEEK_ERROR; |
| 177 | return false; |
| 178 | } |
| 179 | |
| 180 | ogg_page_checksum_set(page); |
| 181 | |
| 182 | /* re-write the page */ |
| 183 | if(write_callback(encoder, page->header, page->header_len, 0, 0, client_data) != FLAC__STREAM_ENCODER_WRITE_STATUS_OK) { |
| 184 | encoder->protected_->state = OggFLAC__SEEKABLE_STREAM_ENCODER_WRITE_ERROR; |
| 185 | return false; |
| 186 | } |
| 187 | |
| 188 | return true; |
| 189 | } |