name : module.graphic.bmp.php <?php ///////////////////////////////////////////////////////////////// /// getID3() by James Heinrich <info@getid3.org> // // available at https://github.com/JamesHeinrich/getID3 // // or https://www.getid3.org // // or http://getid3.sourceforge.net // // see readme.txt for more details // ///////////////////////////////////////////////////////////////// // // // module.graphic.bmp.php // // module for analyzing BMP Image files // // dependencies: NONE // // /// ///////////////////////////////////////////////////////////////// if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers exit; } class getid3_bmp extends getid3_handler { /** * return BMP palette * * @var bool */ public $ExtractPalette = false; /** * return image data * * @var bool */ public $ExtractData = false; /** * @return bool */ 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; $this->fseek($info['avdataoffset']); $offset = 0; $BMPheader = $this->fread(14 + 40); $thisfile_bmp_header_raw['identifier'] = substr($BMPheader, $offset, 2); $offset += 2; $magic = 'BM'; if ($thisfile_bmp_header_raw['identifier'] != $magic) { $this->error('Expecting "'.getid3_lib::PrintHexBytes($magic).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($thisfile_bmp_header_raw['identifier']).'"'); unset($info['fileformat']); unset($info['bmp']); return false; } $thisfile_bmp_header_raw['filesize'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['reserved1'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['reserved2'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['data_offset'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['header_size'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; // check if the hardcoded-to-1 "planes" is at offset 22 or 26 $planes22 = getid3_lib::LittleEndian2Int(substr($BMPheader, 22, 2)); $planes26 = getid3_lib::LittleEndian2Int(substr($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 { $this->error('Unknown BMP subtype (or not a BMP file)'); unset($info['fileformat']); unset($info['bmp']); return false; } $info['fileformat'] = 'bmp'; $info['video']['dataformat'] = 'bmp'; $info['video']['lossless'] = true; $info['video']['pixel_aspect_ratio'] = (float) 1; if ($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 */ $thisfile_bmp_header_raw['width'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['height'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['planes'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['bits_per_pixel'] = getid3_lib::LittleEndian2Int(substr($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 */ $thisfile_bmp_header_raw['compression'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['bmp_data_size'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['resolution_h'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['resolution_v'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['colors_used'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['colors_important'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['resolution_units'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['reserved1'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['recording'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['rendering'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['size1'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['size2'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['color_encoding'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['identifier'] = getid3_lib::LittleEndian2Int(substr($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() ? $thisfile_bmp_header_raw['width'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true); $offset += 4; $thisfile_bmp_header_raw['height'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true); $offset += 4; $thisfile_bmp_header_raw['planes'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['bits_per_pixel'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 2)); $offset += 2; $thisfile_bmp_header_raw['compression'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['bmp_data_size'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['resolution_h'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true); $offset += 4; $thisfile_bmp_header_raw['resolution_v'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4), true); $offset += 4; $thisfile_bmp_header_raw['colors_used'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['colors_important'] = getid3_lib::LittleEndian2Int(substr($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 .= $this->fread(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; $thisfile_bmp_header_raw['red_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['green_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['blue_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['alpha_mask'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['cs_type'] = getid3_lib::LittleEndian2Int(substr($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; $thisfile_bmp_header_raw['gamma_red'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['gamma_green'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['gamma_blue'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header['ciexyz_red'] = getid3_lib::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_red'])); $thisfile_bmp_header['ciexyz_green'] = getid3_lib::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_green'])); $thisfile_bmp_header['ciexyz_blue'] = getid3_lib::FixedPoint2_30(strrev($thisfile_bmp_header_raw['ciexyz_blue'])); } if ($thisfile_bmp['type_version'] >= 5) { $BMPheader .= $this->fread(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; $thisfile_bmp_header_raw['intent'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['profile_data_offset'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['profile_data_size'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; $thisfile_bmp_header_raw['reserved3'] = getid3_lib::LittleEndian2Int(substr($BMPheader, $offset, 4)); $offset += 4; } } else { $this->error('Unknown BMP format in header.'); return false; } if ($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 = $this->fread(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; $blue = getid3_lib::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1)); $green = getid3_lib::LittleEndian2Int(substr($BMPpalette, $paletteoffset++, 1)); $red = getid3_lib::LittleEndian2Int(substr($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) { if (!$thisfile_bmp_header_raw['width'] || !$thisfile_bmp_header_raw['height']) { $thisfile_bmp['data'] = array(); } else { $this->fseek($thisfile_bmp_header_raw['data_offset']); $RowByteLength = ceil(($thisfile_bmp_header_raw['width'] * ($thisfile_bmp_header_raw['bits_per_pixel'] / 8)) / 4) * 4; // round up to nearest DWORD boundry $BMPpixelData = $this->fread($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 & (0x01 << $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 & (0x0F << (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: $this->error('Unknown bits-per-pixel value ('.$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)) { $firstbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $secondbyte = getid3_lib::LittleEndian2Int(substr($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. $colincrement = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $rowincrement = getid3_lib::LittleEndian2Int(substr($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++) { $paletteindex = getid3_lib::LittleEndian2Int(substr($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: $this->error('Unknown bits-per-pixel value ('.$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; $paletteindexes = array(); while ($pixeldataoffset < strlen($BMPpixelData)) { $firstbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $secondbyte = getid3_lib::LittleEndian2Int(substr($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. $colincrement = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $rowincrement = getid3_lib::LittleEndian2Int(substr($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. $paletteindexes = array(); for ($i = 0; $i < ceil($secondbyte / 2); $i++) { $paletteindexbyte = getid3_lib::LittleEndian2Int(substr($BMPpixelData, $pixeldataoffset++, 1)); $paletteindexes[] = ($paletteindexbyte & 0xF0) >> 4; $paletteindexes[] = ($paletteindexbyte & 0x0F); } 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 & 0x0F); 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: $this->error('Unknown bits-per-pixel value ('.$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) & 0x01) == 0) { $redshift++; } while ((($thisfile_bmp_header_raw['green_mask'] >> $greenshift) & 0x01) == 0) { $greenshift++; } while ((($thisfile_bmp_header_raw['blue_mask'] >> $blueshift) & 0x01) == 0) { $blueshift++; } for ($row = ($thisfile_bmp_header_raw['height'] - 1); $row >= 0; $row--) { for ($col = 0; $col < $thisfile_bmp_header_raw['width']; $col++) { $pixelvalue = getid3_lib::LittleEndian2Int(substr($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: $this->error('Unknown bits-per-pixel value ('.$thisfile_bmp_header_raw['bits_per_pixel'].') - cannot read pixel data'); break; } break; default: // unhandled compression type $this->error('Unknown/unhandled compression type value ('.$thisfile_bmp_header_raw['compression'].') - cannot decompress pixel data'); break; } } } return true; } /** * @param array $BMPinfo * * @return bool */ public function PlotBMP(&$BMPinfo) { $starttime = time(); if (!isset($BMPinfo['bmp']['data']) || !is_array($BMPinfo['bmp']['data'])) { echo 'ERROR: no pixel data<BR>'; return false; } set_time_limit(intval(round($BMPinfo['resolution_x'] * $BMPinfo['resolution_y'] / 10000))); if ($im = imagecreatetruecolor($BMPinfo['resolution_x'], $BMPinfo['resolution_y'])) { for ($row = 0; $row < $BMPinfo['resolution_y']; $row++) { for ($col = 0; $col < $BMPinfo['resolution_x']; $col++) { if (isset($BMPinfo['bmp']['data'][$row][$col])) { $red = ($BMPinfo['bmp']['data'][$row][$col] & 0x00FF0000) >> 16; $green = ($BMPinfo['bmp']['data'][$row][$col] & 0x0000FF00) >> 8; $blue = ($BMPinfo['bmp']['data'][$row][$col] & 0x000000FF); $pixelcolor = imagecolorallocate($im, $red, $green, $blue); imagesetpixel($im, $col, $row, $pixelcolor); } else { //echo 'ERROR: no data for pixel '.$row.' x '.$col.'<BR>'; //return false; } } } if (headers_sent()) { echo 'plotted '.($BMPinfo['resolution_x'] * $BMPinfo['resolution_y']).' pixels in '.(time() - $starttime).' seconds<BR>'; imagedestroy($im); exit; } else { header('Content-type: image/png'); imagepng($im); imagedestroy($im); return true; } } return false; } /** * @param int $compressionid * * @return string */ public function BMPcompressionWindowsLookup($compressionid) { static $BMPcompressionWindowsLookup = array( 0 => 'BI_RGB', 1 => 'BI_RLE8', 2 => 'BI_RLE4', 3 => 'BI_BITFIELDS', 4 => 'BI_JPEG', 5 => 'BI_PNG' ); return (isset($BMPcompressionWindowsLookup[$compressionid]) ? $BMPcompressionWindowsLookup[$compressionid] : 'invalid'); } /** * @param int $compressionid * * @return string */ public function BMPcompressionOS2Lookup($compressionid) { static $BMPcompressionOS2Lookup = array( 0 => 'BI_RGB', 1 => 'BI_RLE8', 2 => 'BI_RLE4', 3 => 'Huffman 1D', 4 => 'BI_RLE24', ); return (isset($BMPcompressionOS2Lookup[$compressionid]) ? $BMPcompressionOS2Lookup[$compressionid] : 'invalid'); } }