/usr/share/php/getid3/module.graphic.bmp.php is in php-getid3 1.9.8-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
// available at http://getid3.sourceforge.net //
// or http://www.getid3.org //
// also https://github.com/JamesHeinrich/getID3 //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.graphic.bmp.php //
// module for analyzing BMP Image files //
// dependencies: NONE //
// ///
/////////////////////////////////////////////////////////////////
class getid3_bmp extends getid3_handler
{
public $ExtractPalette = false;
public $ExtractData = false;
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) {
$info['error'][] = 'Expecting "'.getid3_lib::PrintHexBytes($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 {
$info['error'][] = 'Unknown BMP subtype (or not a BMP file)';
unset($info['fileformat']);
unset($info['bmp']);
return false;
}
$info['fileformat'] = 'bmp';
$info['video']['dataformat'] = 'bmp';
$info['video']['lossless'] = true;
$info['video']['pixel_aspect_ratio'] = (float) 1;
if ($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 {
$info['error'][] = 'Unknown BMP format in header.';
return false;
}
if ($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 = $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) {
$this->fseek($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:
$info['error'][] = 'Unknown bits-per-pixel value ('.$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)) {
$firstbyte = getid3_lib::LittleEndian2Int(substr($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:
$info['error'][] = 'Unknown bits-per-pixel value ('.$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)) {
$firstbyte = getid3_lib::LittleEndian2Int(substr($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']) + $col;
break;
default:
// In absolute mode, the first byte is zero. The second byte contains the number
// of color indexes that follow. Subsequent bytes contain color indexes in their
// high- and low-order 4 bits, one color index for each pixel. In absolute mode,
// each run must be aligned on a word boundary.
unset($paletteindexes);
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:
$info['error'][] = 'Unknown bits-per-pixel value ('.$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) & 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:
$info['error'][] = 'Unknown bits-per-pixel value ('.$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;
}
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;
}
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');
}
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');
}
}
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