/** * * @return boolean */ public function Analyze() { $info =& $this->getid3->info; // shortcuts $info['bmp']['header']['raw'] = array(); $thisfile_bmp =& $info['bmp']; $thisfile_bmp_header =& $thisfile_bmp['header']; $thisfile_bmp_header_raw =& $thisfile_bmp_header['raw']; // BITMAPFILEHEADER [14 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_62uq.asp // all versions // WORD bfType; // DWORD bfSize; // WORD bfReserved1; // WORD bfReserved2; // DWORD bfOffBits; fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET); $offset = 0; $BMPheader = fread($this->getid3->fp, 14 + 40); $thisfile_bmp_header_raw['identifier'] = substr($BMPheader, $offset, 2); $offset += 2; $magic = 'BM'; if ($thisfile_bmp_header_raw['identifier'] != $magic) { $info['error'][] = 'Expecting "' . GetId3_Lib_Helper::PrintHexBytes($magic) . '" at offset ' . $info['avdataoffset'] . ', found "' . GetId3_Lib_Helper::PrintHexBytes($thisfile_bmp_header_raw['identifier']) . '"'; unset($info['fileformat']); unset($info['bmp']); return false; } $thisfile_bmp_header_raw['filesize'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['reserved1'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['reserved2'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['data_offset'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['header_size'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; // check if the hardcoded-to-1 "planes" is at offset 22 or 26 $planes22 = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, 22, 2)); $planes26 = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, 26, 2)); if ($planes22 == 1 && $planes26 != 1) { $thisfile_bmp['type_os'] = 'OS/2'; $thisfile_bmp['type_version'] = 1; } elseif ($planes26 == 1 && $planes22 != 1) { $thisfile_bmp['type_os'] = 'Windows'; $thisfile_bmp['type_version'] = 1; } elseif ($thisfile_bmp_header_raw['header_size'] == 12) { $thisfile_bmp['type_os'] = 'OS/2'; $thisfile_bmp['type_version'] = 1; } elseif ($thisfile_bmp_header_raw['header_size'] == 40) { $thisfile_bmp['type_os'] = 'Windows'; $thisfile_bmp['type_version'] = 1; } elseif ($thisfile_bmp_header_raw['header_size'] == 84) { $thisfile_bmp['type_os'] = 'Windows'; $thisfile_bmp['type_version'] = 4; } elseif ($thisfile_bmp_header_raw['header_size'] == 100) { $thisfile_bmp['type_os'] = 'Windows'; $thisfile_bmp['type_version'] = 5; } else { $info['error'][] = 'Unknown BMP subtype (or not a BMP file)'; unset($info['fileformat']); unset($info['bmp']); return false; } $info['fileformat'] = 'bmp'; $info['video']['dataformat'] = 'bmp'; $info['video']['lossless'] = true; $info['video']['pixel_aspect_ratio'] = (double) 1; if ($thisfile_bmp['type_os'] == 'OS/2') { // OS/2-format BMP // http://netghost.narod.ru/gff/graphics/summary/os2bmp.htm // DWORD Size; /* Size of this structure in bytes */ // DWORD Width; /* Bitmap width in pixels */ // DWORD Height; /* Bitmap height in pixel */ // WORD NumPlanes; /* Number of bit planes (color depth) */ // WORD BitsPerPixel; /* Number of bits per pixel per plane */ $thisfile_bmp_header_raw['width'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['height'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['planes'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['bits_per_pixel'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $info['video']['resolution_x'] = $thisfile_bmp_header_raw['width']; $info['video']['resolution_y'] = $thisfile_bmp_header_raw['height']; $info['video']['codec'] = 'BI_RGB ' . $thisfile_bmp_header_raw['bits_per_pixel'] . '-bit'; $info['video']['bits_per_sample'] = $thisfile_bmp_header_raw['bits_per_pixel']; if ($thisfile_bmp['type_version'] >= 2) { // DWORD Compression; /* Bitmap compression scheme */ // DWORD ImageDataSize; /* Size of bitmap data in bytes */ // DWORD XResolution; /* X resolution of display device */ // DWORD YResolution; /* Y resolution of display device */ // DWORD ColorsUsed; /* Number of color table indices used */ // DWORD ColorsImportant; /* Number of important color indices */ // WORD Units; /* Type of units used to measure resolution */ // WORD Reserved; /* Pad structure to 4-byte boundary */ // WORD Recording; /* Recording algorithm */ // WORD Rendering; /* Halftoning algorithm used */ // DWORD Size1; /* Reserved for halftoning algorithm use */ // DWORD Size2; /* Reserved for halftoning algorithm use */ // DWORD ColorEncoding; /* Color model used in bitmap */ // DWORD Identifier; /* Reserved for application use */ $thisfile_bmp_header_raw['compression'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['bmp_data_size'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['resolution_h'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['resolution_v'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['colors_used'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['colors_important'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['resolution_units'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['reserved1'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['recording'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['rendering'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['size1'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['size2'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['color_encoding'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['identifier'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header['compression'] = $this->BMPcompressionOS2Lookup($thisfile_bmp_header_raw['compression']); $info['video']['codec'] = $thisfile_bmp_header['compression'] . ' ' . $thisfile_bmp_header_raw['bits_per_pixel'] . '-bit'; } } elseif ($thisfile_bmp['type_os'] == 'Windows') { // Windows-format BMP // BITMAPINFOHEADER - [40 bytes] http://msdn.microsoft.com/library/en-us/gdi/bitmaps_1rw2.asp // all versions // DWORD biSize; // LONG biWidth; // LONG biHeight; // WORD biPlanes; // WORD biBitCount; // DWORD biCompression; // DWORD biSizeImage; // LONG biXPelsPerMeter; // LONG biYPelsPerMeter; // DWORD biClrUsed; // DWORD biClrImportant; // possibly integrate this section and module.audio-video.riff.php::ParseBITMAPINFOHEADER() ? $thisfile_bmp_header_raw['width'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4), true); $offset += 4; $thisfile_bmp_header_raw['height'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4), true); $offset += 4; $thisfile_bmp_header_raw['planes'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['bits_per_pixel'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['compression'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['bmp_data_size'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['resolution_h'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4), true); $offset += 4; $thisfile_bmp_header_raw['resolution_v'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4), true); $offset += 4; $thisfile_bmp_header_raw['colors_used'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['colors_important'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header['compression'] = $this->BMPcompressionWindowsLookup($thisfile_bmp_header_raw['compression']); $info['video']['resolution_x'] = $thisfile_bmp_header_raw['width']; $info['video']['resolution_y'] = $thisfile_bmp_header_raw['height']; $info['video']['codec'] = $thisfile_bmp_header['compression'] . ' ' . $thisfile_bmp_header_raw['bits_per_pixel'] . '-bit'; $info['video']['bits_per_sample'] = $thisfile_bmp_header_raw['bits_per_pixel']; if ($thisfile_bmp['type_version'] >= 4 || $thisfile_bmp_header_raw['compression'] == 3) { // should only be v4+, but BMPs with type_version==1 and BI_BITFIELDS compression have been seen $BMPheader .= fread($this->getid3->fp, 44); // BITMAPV4HEADER - [44 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_2k1e.asp // Win95+, WinNT4.0+ // DWORD bV4RedMask; // DWORD bV4GreenMask; // DWORD bV4BlueMask; // DWORD bV4AlphaMask; // DWORD bV4CSType; // CIEXYZTRIPLE bV4Endpoints; // DWORD bV4GammaRed; // DWORD bV4GammaGreen; // DWORD bV4GammaBlue; $thisfile_bmp_header_raw['red_mask'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['green_mask'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['blue_mask'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['alpha_mask'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['cs_type'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['ciexyz_red'] = substr($BMPheader, $offset, 4); $offset += 4; $thisfile_bmp_header_raw['ciexyz_green'] = substr($BMPheader, $offset, 4); $offset += 4; $thisfile_bmp_header_raw['ciexyz_blue'] = substr($BMPheader, $offset, 4); $offset += 4; $thisfile_bmp_header_raw['gamma_red'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['gamma_green'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['gamma_blue'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header['ciexyz_red'] = GetId3_Lib_Helper::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_red'])); $thisfile_bmp_header['ciexyz_green'] = GetId3_Lib_Helper::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_green'])); $thisfile_bmp_header['ciexyz_blue'] = GetId3_Lib_Helper::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_blue'])); } if ($thisfile_bmp['type_version'] >= 5) { $BMPheader .= fread($this->getid3->fp, 16); // BITMAPV5HEADER - [16 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_7c36.asp // Win98+, Win2000+ // DWORD bV5Intent; // DWORD bV5ProfileData; // DWORD bV5ProfileSize; // DWORD bV5Reserved; $thisfile_bmp_header_raw['intent'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['profile_data_offset'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['profile_data_size'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['reserved3'] = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; } } else { $info['error'][] = 'Unknown BMP format in header.'; return false; } if ($this->ExtractPalette || $this->ExtractData) { $PaletteEntries = 0; if ($thisfile_bmp_header_raw['bits_per_pixel'] < 16) { $PaletteEntries = pow(2, $thisfile_bmp_header_raw['bits_per_pixel']); } elseif (isset($thisfile_bmp_header_raw['colors_used']) && $thisfile_bmp_header_raw['colors_used'] > 0 && $thisfile_bmp_header_raw['colors_used'] <= 256) { $PaletteEntries = $thisfile_bmp_header_raw['colors_used']; } if ($PaletteEntries > 0) { $BMPpalette = fread($this->getid3->fp, 4 * $PaletteEntries); $paletteoffset = 0; for ($i = 0; $i < $PaletteEntries; $i++) { // RGBQUAD - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_5f8y.asp // BYTE rgbBlue; // BYTE rgbGreen; // BYTE rgbRed; // BYTE rgbReserved; $blue = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1)); $green = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1)); $red = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1)); if ($thisfile_bmp['type_os'] == 'OS/2' && $thisfile_bmp['type_version'] == 1) { // no padding byte } else { $paletteoffset++; // padding byte } $thisfile_bmp['palette'][$i] = $red << 16 | $green << 8 | $blue; } } } if ($this->ExtractData) { fseek($this->getid3->fp, $thisfile_bmp_header_raw['data_offset'], SEEK_SET); $RowByteLength = ceil($thisfile_bmp_header_raw['width'] * ($thisfile_bmp_header_raw['bits_per_pixel'] / 8) / 4) * 4; // round up to nearest DWORD boundry $BMPpixelData = fread($this->getid3->fp, $thisfile_bmp_header_raw['height'] * $RowByteLength); $pixeldataoffset = 0; $thisfile_bmp_header_raw['compression'] = isset($thisfile_bmp_header_raw['compression']) ? $thisfile_bmp_header_raw['compression'] : ''; switch ($thisfile_bmp_header_raw['compression']) { case 0: // BI_RGB switch ($thisfile_bmp_header_raw['bits_per_pixel']) { case 1: for ($row = $thisfile_bmp_header_raw['height'] - 1; $row >= 0; $row--) { for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col = $col) { $paletteindexbyte = ord($BMPpixelData[$pixeldataoffset++]); for ($i = 7; $i >= 0; $i--) { $paletteindex = ($paletteindexbyte & 0x1 << $i) >> $i; $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex]; $col++; } } while ($pixeldataoffset % 4 != 0) { // lines are padded to nearest DWORD $pixeldataoffset++; } } break; case 4: for ($row = $thisfile_bmp_header_raw['height'] - 1; $row >= 0; $row--) { for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col = $col) { $paletteindexbyte = ord($BMPpixelData[$pixeldataoffset++]); for ($i = 1; $i >= 0; $i--) { $paletteindex = ($paletteindexbyte & 0xf << 4 * $i) >> 4 * $i; $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex]; $col++; } } while ($pixeldataoffset % 4 != 0) { // lines are padded to nearest DWORD $pixeldataoffset++; } } break; case 8: for ($row = $thisfile_bmp_header_raw['height'] - 1; $row >= 0; $row--) { for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) { $paletteindex = ord($BMPpixelData[$pixeldataoffset++]); $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex]; } while ($pixeldataoffset % 4 != 0) { // lines are padded to nearest DWORD $pixeldataoffset++; } } break; case 24: for ($row = $thisfile_bmp_header_raw['height'] - 1; $row >= 0; $row--) { for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) { $thisfile_bmp['data'][$row][$col] = ord($BMPpixelData[$pixeldataoffset + 2]) << 16 | ord($BMPpixelData[$pixeldataoffset + 1]) << 8 | ord($BMPpixelData[$pixeldataoffset]); $pixeldataoffset += 3; } while ($pixeldataoffset % 4 != 0) { // lines are padded to nearest DWORD $pixeldataoffset++; } } break; case 32: for ($row = $thisfile_bmp_header_raw['height'] - 1; $row >= 0; $row--) { for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) { $thisfile_bmp['data'][$row][$col] = ord($BMPpixelData[$pixeldataoffset + 3]) << 24 | ord($BMPpixelData[$pixeldataoffset + 2]) << 16 | ord($BMPpixelData[$pixeldataoffset + 1]) << 8 | ord($BMPpixelData[$pixeldataoffset]); $pixeldataoffset += 4; } while ($pixeldataoffset % 4 != 0) { // lines are padded to nearest DWORD $pixeldataoffset++; } } break; case 16: // ? break; default: $info['error'][] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw['bits_per_pixel'] . ') - cannot read pixel data'; break; } break; case 1: // BI_RLE8 - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_6x0u.asp switch ($thisfile_bmp_header_raw['bits_per_pixel']) { case 8: $pixelcounter = 0; while ($pixeldataoffset < strlen($BMPpixelData)) { $firstbyte = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $secondbyte = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); if ($firstbyte == 0) { // escaped/absolute mode - the first byte of the pair can be set to zero to // indicate an escape character that denotes the end of a line, the end of // a bitmap, or a delta, depending on the value of the second byte. switch ($secondbyte) { case 0: // end of line // no need for special processing, just ignore break; case 1: // end of bitmap $pixeldataoffset = strlen($BMPpixelData); // force to exit loop just in case break; case 2: // delta - The 2 bytes following the escape contain unsigned values // indicating the horizontal and vertical offsets of the next pixel // from the current position. $colincrement = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $rowincrement = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $col = $pixelcounter % $thisfile_bmp_header_raw['width'] + $colincrement; $row = $thisfile_bmp_header_raw['height'] - 1 - ($pixelcounter - $col) / $thisfile_bmp_header_raw['width'] - $rowincrement; $pixelcounter = $row * $thisfile_bmp_header_raw['width'] + $col; break; default: // In absolute mode, the first byte is zero and the second byte is a // value in the range 03H through FFH. The second byte represents the // number of bytes that follow, each of which contains the color index // of a single pixel. Each run must be aligned on a word boundary. for ($i = 0; $i < $secondbyte; $i++) { $paletteindex = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $col = $pixelcounter % $thisfile_bmp_header_raw['width']; $row = $thisfile_bmp_header_raw['height'] - 1 - ($pixelcounter - $col) / $thisfile_bmp_header_raw['width']; $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex]; $pixelcounter++; } while ($pixeldataoffset % 2 != 0) { // Each run must be aligned on a word boundary. $pixeldataoffset++; } break; } } else { // encoded mode - the first byte specifies the number of consecutive pixels // to be drawn using the color index contained in the second byte. for ($i = 0; $i < $firstbyte; $i++) { $col = $pixelcounter % $thisfile_bmp_header_raw['width']; $row = $thisfile_bmp_header_raw['height'] - 1 - ($pixelcounter - $col) / $thisfile_bmp_header_raw['width']; $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$secondbyte]; $pixelcounter++; } } } break; default: $info['error'][] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw['bits_per_pixel'] . ') - cannot read pixel data'; break; } break; case 2: // BI_RLE4 - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_6x0u.asp switch ($thisfile_bmp_header_raw['bits_per_pixel']) { case 4: $pixelcounter = 0; while ($pixeldataoffset < strlen($BMPpixelData)) { $firstbyte = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $secondbyte = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); if ($firstbyte == 0) { // escaped/absolute mode - the first byte of the pair can be set to zero to // indicate an escape character that denotes the end of a line, the end of // a bitmap, or a delta, depending on the value of the second byte. switch ($secondbyte) { case 0: // end of line // no need for special processing, just ignore break; case 1: // end of bitmap $pixeldataoffset = strlen($BMPpixelData); // force to exit loop just in case break; case 2: // delta - The 2 bytes following the escape contain unsigned values // indicating the horizontal and vertical offsets of the next pixel // from the current position. $colincrement = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $rowincrement = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $col = $pixelcounter % $thisfile_bmp_header_raw['width'] + $colincrement; $row = $thisfile_bmp_header_raw['height'] - 1 - ($pixelcounter - $col) / $thisfile_bmp_header_raw['width'] - $rowincrement; $pixelcounter = $row * $thisfile_bmp_header_raw['width'] + $col; break; default: // In absolute mode, the first byte is zero. The second byte contains the number // of color indexes that follow. Subsequent bytes contain color indexes in their // high- and low-order 4 bits, one color index for each pixel. In absolute mode, // each run must be aligned on a word boundary. unset($paletteindexes); for ($i = 0; $i < ceil($secondbyte / 2); $i++) { $paletteindexbyte = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $paletteindexes[] = ($paletteindexbyte & 0xf0) >> 4; $paletteindexes[] = $paletteindexbyte & 0xf; } while ($pixeldataoffset % 2 != 0) { // Each run must be aligned on a word boundary. $pixeldataoffset++; } foreach ($paletteindexes as $paletteindex) { $col = $pixelcounter % $thisfile_bmp_header_raw['width']; $row = $thisfile_bmp_header_raw['height'] - 1 - ($pixelcounter - $col) / $thisfile_bmp_header_raw['width']; $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindex]; $pixelcounter++; } break; } } else { // encoded mode - the first byte of the pair contains the number of pixels to be // drawn using the color indexes in the second byte. The second byte contains two // color indexes, one in its high-order 4 bits and one in its low-order 4 bits. // The first of the pixels is drawn using the color specified by the high-order // 4 bits, the second is drawn using the color in the low-order 4 bits, the third // is drawn using the color in the high-order 4 bits, and so on, until all the // pixels specified by the first byte have been drawn. $paletteindexes[0] = ($secondbyte & 0xf0) >> 4; $paletteindexes[1] = $secondbyte & 0xf; for ($i = 0; $i < $firstbyte; $i++) { $col = $pixelcounter % $thisfile_bmp_header_raw['width']; $row = $thisfile_bmp_header_raw['height'] - 1 - ($pixelcounter - $col) / $thisfile_bmp_header_raw['width']; $thisfile_bmp['data'][$row][$col] = $thisfile_bmp['palette'][$paletteindexes[$i % 2]]; $pixelcounter++; } } } break; default: $info['error'][] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw['bits_per_pixel'] . ') - cannot read pixel data'; break; } break; case 3: // BI_BITFIELDS switch ($thisfile_bmp_header_raw['bits_per_pixel']) { case 16: case 32: $redshift = 0; $greenshift = 0; $blueshift = 0; while (($thisfile_bmp_header_raw['red_mask'] >> $redshift & 0x1) == 0) { $redshift++; } while (($thisfile_bmp_header_raw['green_mask'] >> $greenshift & 0x1) == 0) { $greenshift++; } while (($thisfile_bmp_header_raw['blue_mask'] >> $blueshift & 0x1) == 0) { $blueshift++; } for ($row = $thisfile_bmp_header_raw['height'] - 1; $row >= 0; $row--) { for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) { $pixelvalue = GetId3_Lib_Helper::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset, $thisfile_bmp_header_raw['bits_per_pixel'] / 8)); $pixeldataoffset += $thisfile_bmp_header_raw['bits_per_pixel'] / 8; $red = intval(round((($pixelvalue & $thisfile_bmp_header_raw['red_mask']) >> $redshift) / ($thisfile_bmp_header_raw['red_mask'] >> $redshift) * 255)); $green = intval(round((($pixelvalue & $thisfile_bmp_header_raw['green_mask']) >> $greenshift) / ($thisfile_bmp_header_raw['green_mask'] >> $greenshift) * 255)); $blue = intval(round((($pixelvalue & $thisfile_bmp_header_raw['blue_mask']) >> $blueshift) / ($thisfile_bmp_header_raw['blue_mask'] >> $blueshift) * 255)); $thisfile_bmp['data'][$row][$col] = $red << 16 | $green << 8 | $blue; } while ($pixeldataoffset % 4 != 0) { // lines are padded to nearest DWORD $pixeldataoffset++; } } break; default: $info['error'][] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw['bits_per_pixel'] . ') - cannot read pixel data'; break; } break; default: // unhandled compression type $info['error'][] = 'Unknown/unhandled compression type value (' . $thisfile_bmp_header_raw['compression'] . ') - cannot decompress pixel data'; break; } } return true; }