function _splitChunk($eoiFinish = true, $sosScan = true) { $bitin = new IO_Bit(); $bitin->input($this->_jpegdata); while ($bitin->hasNextData()) { $marker1 = $bitin->getUI8(); if ($marker1 != 0xff) { fprintf(STDERR, "dumpChunk: marker1=0x%02X", $marker1); return false; } $marker2 = $bitin->getUI8(); switch ($marker2) { case 0xd8: // SOI (Start of Image) $this->_jpegChunk[] = array('marker' => $marker2, 'data' => null, 'length' => null); continue; case 0xd9: // EOI (End of Image) $this->_jpegChunk[] = array('marker' => $marker2, 'data' => null, 'length' => null); if ($eoiFinish) { break 2; // while break; } continue; case 0xda: // SOS if ($sosScan === false) { $remainData = $bitin->getDataUntil(false); $this->_jpegChunk[] = array('marker' => $marker2, 'data' => $remainData, 'length' => null); break 2; // while break; } case 0xd0: case 0xd1: case 0xd2: case 0xd3: // RST // RST case 0xd4: case 0xd5: case 0xd6: case 0xd7: // RST list($chunk_data_offset, $dummy) = $bitin->getOffset(); while (true) { $next_marker1 = $bitin->getUI8(); if ($next_marker1 != 0xff) { continue; } $next_marker2 = $bitin->getUI8(); if ($next_marker2 == 0x0) { continue; } $bitin->incrementOffset(-2, 0); // back from next marker list($next_chunk_offset, $dummy) = $bitin->getOffset(); $length = $next_chunk_offset - $chunk_data_offset; $bitin->setOffset($chunk_data_offset, 0); $this->_jpegChunk[] = array('marker' => $marker2, 'data' => $bitin->getData($length), 'length' => null); break; } break; default: $length = $bitin->getUI16BE(); $this->_jpegChunk[] = array('marker' => $marker2, 'data' => $bitin->getData($length - 2), 'length' => $length); continue; } } }
function parse($mfidata) { $reader = new IO_Bit(); $reader->input($mfidata); // Header Part $identifier = $reader->getData(4); if ($identifier != 'melo') { throw new Exception('Identifer($identifier) is not melo'); } $this->headers['Identifier'] = $identifier; $fileLength = $reader->getUI32BE(); $realFileLength = strlen($mfidata); if ($fileLength != $realFileLength - 8) { throw new Exception("FileLength({$fileLength}) is not real FileLength({$realFileLength}) - 8"); } $this->headers['FileLength'] = $fileLength; $offsetToTrack = $reader->getUI16BE(); $this->headers['OffsetToTrack'] = $offsetToTrack; $this->headers['DataTypeMajor'] = $reader->getUI8(); $this->headers['DataTypeMinor'] = $reader->getUI8(); $this->headers['NumberOfTrack'] = $reader->getUI8(); // Data Information Part $reader_di = new IO_Bit(); $reader_di->input($reader->getData($offsetToTrack - 3)); $note_message_length_info = 0; while ($reader_di->hasNextData(6)) { $info = array(); $identifer = $reader_di->getData(4); $length = $reader_di->getUI16BE(); $info['Identifer'] = $identifer; $info['Length'] = $length; switch ($identifer) { case 'titl': case 'copy': case 'prot': case 'date': $data = $reader_di->getData($length); break; case 'sorc': $data = $reader_di->getUI8($length); break; case 'note': case 'exst': $data = $reader_di->getUI16BE($length); if ($identifer == 'note') { $note_message_length_info = $data; } break; case 'vers': $data = $reader_di->getUI32BE($length); break; } $info['Data'] = $data; $this->datainfos[] = $info; } // Track Part while ($reader->hasNextData(8)) { $track = array(); $track['Identifer'] = $reader->getData(4); $length = $reader->getUI32BE(); $track['Length'] = $length; $reader_ev = new IO_Bit(); $reader_ev->input($reader->getData($length)); $track['Events'] = array(); while ($reader_ev->hasNextData(3)) { $event = array(); $event['DeltaTime'] = $reader_ev->getUI8(); $statusInfo = $reader_ev->getUI8(); $event['StatusInfo'] = $statusInfo; switch ($statusInfo) { default: $event['Data'] = $reader_ev->getUI8(); if ($note_message_length_info == 1) { // MFi2 $event['Data2'] = $reader_ev->getUI8(); } break; case 0xff: $statusInfo2 = $reader_ev->getUI8(); $event['StatusInfo2'] = $statusInfo2; switch ($statusInfo2) { default: $event['Data'] = $reader_ev->getUI8(); break; case 0xf0: case 0xf1: case 0xff: $length = $reader_ev->getUI16BE(); $event['Length'] = $length; $event['Data'] = $reader_ev->getData($length); break; } } $track['Events'][] = $event; } $this->tracks[] = $track; } }