/getid3/module.graphic.bmp.php
PHP | 685 lines | 477 code | 80 blank | 128 comment | 101 complexity | 61d013baaf4016f97108da9b2f873b7a MD5 | raw file
1<?php 2///////////////////////////////////////////////////////////////// 3/// getID3() by James Heinrich <info@getid3.org> // 4// available at http://getid3.sourceforge.net // 5// or http://www.getid3.org // 6///////////////////////////////////////////////////////////////// 7// See readme.txt for more details // 8///////////////////////////////////////////////////////////////// 9// // 10// module.graphic.bmp.php // 11// module for analyzing BMP Image files // 12// dependencies: NONE // 13// /// 14///////////////////////////////////////////////////////////////// 15 16 17class getid3_bmp extends getid3_handler { 18 var $ExtractPalette = false; 19 var $ExtractData = false; 20 21 function Analyze() { 22 $info = &$this->getid3->info; 23 24 // shortcuts 25 $info ['bmp'] ['header'] ['raw'] = array (); 26 $thisfile_bmp = &$info ['bmp']; 27 $thisfile_bmp_header = &$thisfile_bmp ['header']; 28 $thisfile_bmp_header_raw = &$thisfile_bmp_header ['raw']; 29 30 // BITMAPFILEHEADER [14 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_62uq.asp 31 // all versions 32 // WORD bfType; 33 // DWORD bfSize; 34 // WORD bfReserved1; 35 // WORD bfReserved2; 36 // DWORD bfOffBits; 37 38 39 fseek ( $this->getid3->fp, $info ['avdataoffset'], SEEK_SET ); 40 $offset = 0; 41 $BMPheader = fread ( $this->getid3->fp, 14 + 40 ); 42 43 $thisfile_bmp_header_raw ['identifier'] = substr ( $BMPheader, $offset, 2 ); 44 $offset += 2; 45 46 $magic = 'BM'; 47 if ($thisfile_bmp_header_raw ['identifier'] != $magic) { 48 $info ['error'] [] = 'Expecting "' . getid3_lib::PrintHexBytes ( $magic ) . '" at offset ' . $info ['avdataoffset'] . ', found "' . getid3_lib::PrintHexBytes ( $thisfile_bmp_header_raw ['identifier'] ) . '"'; 49 unset ( $info ['fileformat'] ); 50 unset ( $info ['bmp'] ); 51 return false; 52 } 53 54 $thisfile_bmp_header_raw ['filesize'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 55 $offset += 4; 56 $thisfile_bmp_header_raw ['reserved1'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 57 $offset += 2; 58 $thisfile_bmp_header_raw ['reserved2'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 59 $offset += 2; 60 $thisfile_bmp_header_raw ['data_offset'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 61 $offset += 4; 62 $thisfile_bmp_header_raw ['header_size'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 63 $offset += 4; 64 65 // check if the hardcoded-to-1 "planes" is at offset 22 or 26 66 $planes22 = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, 22, 2 ) ); 67 $planes26 = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, 26, 2 ) ); 68 if (($planes22 == 1) && ($planes26 != 1)) { 69 $thisfile_bmp ['type_os'] = 'OS/2'; 70 $thisfile_bmp ['type_version'] = 1; 71 } elseif (($planes26 == 1) && ($planes22 != 1)) { 72 $thisfile_bmp ['type_os'] = 'Windows'; 73 $thisfile_bmp ['type_version'] = 1; 74 } elseif ($thisfile_bmp_header_raw ['header_size'] == 12) { 75 $thisfile_bmp ['type_os'] = 'OS/2'; 76 $thisfile_bmp ['type_version'] = 1; 77 } elseif ($thisfile_bmp_header_raw ['header_size'] == 40) { 78 $thisfile_bmp ['type_os'] = 'Windows'; 79 $thisfile_bmp ['type_version'] = 1; 80 } elseif ($thisfile_bmp_header_raw ['header_size'] == 84) { 81 $thisfile_bmp ['type_os'] = 'Windows'; 82 $thisfile_bmp ['type_version'] = 4; 83 } elseif ($thisfile_bmp_header_raw ['header_size'] == 100) { 84 $thisfile_bmp ['type_os'] = 'Windows'; 85 $thisfile_bmp ['type_version'] = 5; 86 } else { 87 $info ['error'] [] = 'Unknown BMP subtype (or not a BMP file)'; 88 unset ( $info ['fileformat'] ); 89 unset ( $info ['bmp'] ); 90 return false; 91 } 92 93 $info ['fileformat'] = 'bmp'; 94 $info ['video'] ['dataformat'] = 'bmp'; 95 $info ['video'] ['lossless'] = true; 96 $info ['video'] ['pixel_aspect_ratio'] = ( float ) 1; 97 98 if ($thisfile_bmp ['type_os'] == 'OS/2') { 99 100 // OS/2-format BMP 101 // http://netghost.narod.ru/gff/graphics/summary/os2bmp.htm 102 103 104 // DWORD Size; /* Size of this structure in bytes */ 105 // DWORD Width; /* Bitmap width in pixels */ 106 // DWORD Height; /* Bitmap height in pixel */ 107 // WORD NumPlanes; /* Number of bit planes (color depth) */ 108 // WORD BitsPerPixel; /* Number of bits per pixel per plane */ 109 110 111 $thisfile_bmp_header_raw ['width'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 112 $offset += 2; 113 $thisfile_bmp_header_raw ['height'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 114 $offset += 2; 115 $thisfile_bmp_header_raw ['planes'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 116 $offset += 2; 117 $thisfile_bmp_header_raw ['bits_per_pixel'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 118 $offset += 2; 119 120 $info ['video'] ['resolution_x'] = $thisfile_bmp_header_raw ['width']; 121 $info ['video'] ['resolution_y'] = $thisfile_bmp_header_raw ['height']; 122 $info ['video'] ['codec'] = 'BI_RGB ' . $thisfile_bmp_header_raw ['bits_per_pixel'] . '-bit'; 123 $info ['video'] ['bits_per_sample'] = $thisfile_bmp_header_raw ['bits_per_pixel']; 124 125 if ($thisfile_bmp ['type_version'] >= 2) { 126 // DWORD Compression; /* Bitmap compression scheme */ 127 // DWORD ImageDataSize; /* Size of bitmap data in bytes */ 128 // DWORD XResolution; /* X resolution of display device */ 129 // DWORD YResolution; /* Y resolution of display device */ 130 // DWORD ColorsUsed; /* Number of color table indices used */ 131 // DWORD ColorsImportant; /* Number of important color indices */ 132 // WORD Units; /* Type of units used to measure resolution */ 133 // WORD Reserved; /* Pad structure to 4-byte boundary */ 134 // WORD Recording; /* Recording algorithm */ 135 // WORD Rendering; /* Halftoning algorithm used */ 136 // DWORD Size1; /* Reserved for halftoning algorithm use */ 137 // DWORD Size2; /* Reserved for halftoning algorithm use */ 138 // DWORD ColorEncoding; /* Color model used in bitmap */ 139 // DWORD Identifier; /* Reserved for application use */ 140 141 142 $thisfile_bmp_header_raw ['compression'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 143 $offset += 4; 144 $thisfile_bmp_header_raw ['bmp_data_size'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 145 $offset += 4; 146 $thisfile_bmp_header_raw ['resolution_h'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 147 $offset += 4; 148 $thisfile_bmp_header_raw ['resolution_v'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 149 $offset += 4; 150 $thisfile_bmp_header_raw ['colors_used'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 151 $offset += 4; 152 $thisfile_bmp_header_raw ['colors_important'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 153 $offset += 4; 154 $thisfile_bmp_header_raw ['resolution_units'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 155 $offset += 2; 156 $thisfile_bmp_header_raw ['reserved1'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 157 $offset += 2; 158 $thisfile_bmp_header_raw ['recording'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 159 $offset += 2; 160 $thisfile_bmp_header_raw ['rendering'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 161 $offset += 2; 162 $thisfile_bmp_header_raw ['size1'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 163 $offset += 4; 164 $thisfile_bmp_header_raw ['size2'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 165 $offset += 4; 166 $thisfile_bmp_header_raw ['color_encoding'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 167 $offset += 4; 168 $thisfile_bmp_header_raw ['identifier'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 169 $offset += 4; 170 171 $thisfile_bmp_header ['compression'] = $this->BMPcompressionOS2Lookup ( $thisfile_bmp_header_raw ['compression'] ); 172 173 $info ['video'] ['codec'] = $thisfile_bmp_header ['compression'] . ' ' . $thisfile_bmp_header_raw ['bits_per_pixel'] . '-bit'; 174 } 175 176 } elseif ($thisfile_bmp ['type_os'] == 'Windows') { 177 178 // Windows-format BMP 179 180 181 // BITMAPINFOHEADER - [40 bytes] http://msdn.microsoft.com/library/en-us/gdi/bitmaps_1rw2.asp 182 // all versions 183 // DWORD biSize; 184 // LONG biWidth; 185 // LONG biHeight; 186 // WORD biPlanes; 187 // WORD biBitCount; 188 // DWORD biCompression; 189 // DWORD biSizeImage; 190 // LONG biXPelsPerMeter; 191 // LONG biYPelsPerMeter; 192 // DWORD biClrUsed; 193 // DWORD biClrImportant; 194 195 196 // possibly integrate this section and module.audio-video.riff.php::ParseBITMAPINFOHEADER() ? 197 198 199 $thisfile_bmp_header_raw ['width'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ), true ); 200 $offset += 4; 201 $thisfile_bmp_header_raw ['height'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ), true ); 202 $offset += 4; 203 $thisfile_bmp_header_raw ['planes'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 204 $offset += 2; 205 $thisfile_bmp_header_raw ['bits_per_pixel'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 2 ) ); 206 $offset += 2; 207 $thisfile_bmp_header_raw ['compression'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 208 $offset += 4; 209 $thisfile_bmp_header_raw ['bmp_data_size'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 210 $offset += 4; 211 $thisfile_bmp_header_raw ['resolution_h'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ), true ); 212 $offset += 4; 213 $thisfile_bmp_header_raw ['resolution_v'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ), true ); 214 $offset += 4; 215 $thisfile_bmp_header_raw ['colors_used'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 216 $offset += 4; 217 $thisfile_bmp_header_raw ['colors_important'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 218 $offset += 4; 219 220 $thisfile_bmp_header ['compression'] = $this->BMPcompressionWindowsLookup ( $thisfile_bmp_header_raw ['compression'] ); 221 $info ['video'] ['resolution_x'] = $thisfile_bmp_header_raw ['width']; 222 $info ['video'] ['resolution_y'] = $thisfile_bmp_header_raw ['height']; 223 $info ['video'] ['codec'] = $thisfile_bmp_header ['compression'] . ' ' . $thisfile_bmp_header_raw ['bits_per_pixel'] . '-bit'; 224 $info ['video'] ['bits_per_sample'] = $thisfile_bmp_header_raw ['bits_per_pixel']; 225 226 if (($thisfile_bmp ['type_version'] >= 4) || ($thisfile_bmp_header_raw ['compression'] == 3)) { 227 // should only be v4+, but BMPs with type_version==1 and BI_BITFIELDS compression have been seen 228 $BMPheader .= fread ( $this->getid3->fp, 44 ); 229 230 // BITMAPV4HEADER - [44 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_2k1e.asp 231 // Win95+, WinNT4.0+ 232 // DWORD bV4RedMask; 233 // DWORD bV4GreenMask; 234 // DWORD bV4BlueMask; 235 // DWORD bV4AlphaMask; 236 // DWORD bV4CSType; 237 // CIEXYZTRIPLE bV4Endpoints; 238 // DWORD bV4GammaRed; 239 // DWORD bV4GammaGreen; 240 // DWORD bV4GammaBlue; 241 $thisfile_bmp_header_raw ['red_mask'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 242 $offset += 4; 243 $thisfile_bmp_header_raw ['green_mask'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 244 $offset += 4; 245 $thisfile_bmp_header_raw ['blue_mask'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 246 $offset += 4; 247 $thisfile_bmp_header_raw ['alpha_mask'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 248 $offset += 4; 249 $thisfile_bmp_header_raw ['cs_type'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 250 $offset += 4; 251 $thisfile_bmp_header_raw ['ciexyz_red'] = substr ( $BMPheader, $offset, 4 ); 252 $offset += 4; 253 $thisfile_bmp_header_raw ['ciexyz_green'] = substr ( $BMPheader, $offset, 4 ); 254 $offset += 4; 255 $thisfile_bmp_header_raw ['ciexyz_blue'] = substr ( $BMPheader, $offset, 4 ); 256 $offset += 4; 257 $thisfile_bmp_header_raw ['gamma_red'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 258 $offset += 4; 259 $thisfile_bmp_header_raw ['gamma_green'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 260 $offset += 4; 261 $thisfile_bmp_header_raw ['gamma_blue'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 262 $offset += 4; 263 264 $thisfile_bmp_header ['ciexyz_red'] = getid3_lib::FixedPoint2_30 ( strrev ( $thisfile_bmp_header_raw ['ciexyz_red'] ) ); 265 $thisfile_bmp_header ['ciexyz_green'] = getid3_lib::FixedPoint2_30 ( strrev ( $thisfile_bmp_header_raw ['ciexyz_green'] ) ); 266 $thisfile_bmp_header ['ciexyz_blue'] = getid3_lib::FixedPoint2_30 ( strrev ( $thisfile_bmp_header_raw ['ciexyz_blue'] ) ); 267 } 268 269 if ($thisfile_bmp ['type_version'] >= 5) { 270 $BMPheader .= fread ( $this->getid3->fp, 16 ); 271 272 // BITMAPV5HEADER - [16 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_7c36.asp 273 // Win98+, Win2000+ 274 // DWORD bV5Intent; 275 // DWORD bV5ProfileData; 276 // DWORD bV5ProfileSize; 277 // DWORD bV5Reserved; 278 $thisfile_bmp_header_raw ['intent'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 279 $offset += 4; 280 $thisfile_bmp_header_raw ['profile_data_offset'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 281 $offset += 4; 282 $thisfile_bmp_header_raw ['profile_data_size'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 283 $offset += 4; 284 $thisfile_bmp_header_raw ['reserved3'] = getid3_lib::LittleEndian2Int ( substr ( $BMPheader, $offset, 4 ) ); 285 $offset += 4; 286 } 287 288 } else { 289 290 $info ['error'] [] = 'Unknown BMP format in header.'; 291 return false; 292 293 } 294 295 if ($this->ExtractPalette || $this->ExtractData) { 296 $PaletteEntries = 0; 297 if ($thisfile_bmp_header_raw ['bits_per_pixel'] < 16) { 298 $PaletteEntries = pow ( 2, $thisfile_bmp_header_raw ['bits_per_pixel'] ); 299 } elseif (isset ( $thisfile_bmp_header_raw ['colors_used'] ) && ($thisfile_bmp_header_raw ['colors_used'] > 0) && ($thisfile_bmp_header_raw ['colors_used'] <= 256)) { 300 $PaletteEntries = $thisfile_bmp_header_raw ['colors_used']; 301 } 302 if ($PaletteEntries > 0) { 303 $BMPpalette = fread ( $this->getid3->fp, 4 * $PaletteEntries ); 304 $paletteoffset = 0; 305 for($i = 0; $i < $PaletteEntries; $i ++) { 306 // RGBQUAD - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_5f8y.asp 307 // BYTE rgbBlue; 308 // BYTE rgbGreen; 309 // BYTE rgbRed; 310 // BYTE rgbReserved; 311 $blue = getid3_lib::LittleEndian2Int ( substr ( $BMPpalette, $paletteoffset ++, 1 ) ); 312 $green = getid3_lib::LittleEndian2Int ( substr ( $BMPpalette, $paletteoffset ++, 1 ) ); 313 $red = getid3_lib::LittleEndian2Int ( substr ( $BMPpalette, $paletteoffset ++, 1 ) ); 314 if (($thisfile_bmp ['type_os'] == 'OS/2') && ($thisfile_bmp ['type_version'] == 1)) { 315 // no padding byte 316 } else { 317 $paletteoffset ++; // padding byte 318 } 319 $thisfile_bmp ['palette'] [$i] = (($red << 16) | ($green << 8) | $blue); 320 } 321 } 322 } 323 324 if ($this->ExtractData) { 325 fseek ( $this->getid3->fp, $thisfile_bmp_header_raw ['data_offset'], SEEK_SET ); 326 $RowByteLength = ceil ( ($thisfile_bmp_header_raw ['width'] * ($thisfile_bmp_header_raw ['bits_per_pixel'] / 8)) / 4 ) * 4; // round up to nearest DWORD boundry 327 $BMPpixelData = fread ( $this->getid3->fp, $thisfile_bmp_header_raw ['height'] * $RowByteLength ); 328 $pixeldataoffset = 0; 329 $thisfile_bmp_header_raw ['compression'] = (isset ( $thisfile_bmp_header_raw ['compression'] ) ? $thisfile_bmp_header_raw ['compression'] : ''); 330 switch ($thisfile_bmp_header_raw ['compression']) { 331 332 case 0 : // BI_RGB 333 switch ($thisfile_bmp_header_raw ['bits_per_pixel']) { 334 case 1 : 335 for($row = ($thisfile_bmp_header_raw ['height'] - 1); $row >= 0; $row --) { 336 for($col = 0; $col < $thisfile_bmp_header_raw ['width']; $col = $col) { 337 $paletteindexbyte = ord ( $BMPpixelData {$pixeldataoffset ++} ); 338 for($i = 7; $i >= 0; $i --) { 339 $paletteindex = ($paletteindexbyte & (0x01 << $i)) >> $i; 340 $thisfile_bmp ['data'] [$row] [$col] = $thisfile_bmp ['palette'] [$paletteindex]; 341 $col ++; 342 } 343 } 344 while ( ($pixeldataoffset % 4) != 0 ) { 345 // lines are padded to nearest DWORD 346 $pixeldataoffset ++; 347 } 348 } 349 break; 350 351 case 4 : 352 for($row = ($thisfile_bmp_header_raw ['height'] - 1); $row >= 0; $row --) { 353 for($col = 0; $col < $thisfile_bmp_header_raw ['width']; $col = $col) { 354 $paletteindexbyte = ord ( $BMPpixelData {$pixeldataoffset ++} ); 355 for($i = 1; $i >= 0; $i --) { 356 $paletteindex = ($paletteindexbyte & (0x0F << (4 * $i))) >> (4 * $i); 357 $thisfile_bmp ['data'] [$row] [$col] = $thisfile_bmp ['palette'] [$paletteindex]; 358 $col ++; 359 } 360 } 361 while ( ($pixeldataoffset % 4) != 0 ) { 362 // lines are padded to nearest DWORD 363 $pixeldataoffset ++; 364 } 365 } 366 break; 367 368 case 8 : 369 for($row = ($thisfile_bmp_header_raw ['height'] - 1); $row >= 0; $row --) { 370 for($col = 0; $col < $thisfile_bmp_header_raw ['width']; $col ++) { 371 $paletteindex = ord ( $BMPpixelData {$pixeldataoffset ++} ); 372 $thisfile_bmp ['data'] [$row] [$col] = $thisfile_bmp ['palette'] [$paletteindex]; 373 } 374 while ( ($pixeldataoffset % 4) != 0 ) { 375 // lines are padded to nearest DWORD 376 $pixeldataoffset ++; 377 } 378 } 379 break; 380 381 case 24 : 382 for($row = ($thisfile_bmp_header_raw ['height'] - 1); $row >= 0; $row --) { 383 for($col = 0; $col < $thisfile_bmp_header_raw ['width']; $col ++) { 384 $thisfile_bmp ['data'] [$row] [$col] = (ord ( $BMPpixelData {$pixeldataoffset + 2} ) << 16) | (ord ( $BMPpixelData {$pixeldataoffset + 1} ) << 8) | ord ( $BMPpixelData {$pixeldataoffset} ); 385 $pixeldataoffset += 3; 386 } 387 while ( ($pixeldataoffset % 4) != 0 ) { 388 // lines are padded to nearest DWORD 389 $pixeldataoffset ++; 390 } 391 } 392 break; 393 394 case 32 : 395 for($row = ($thisfile_bmp_header_raw ['height'] - 1); $row >= 0; $row --) { 396 for($col = 0; $col < $thisfile_bmp_header_raw ['width']; $col ++) { 397 $thisfile_bmp ['data'] [$row] [$col] = (ord ( $BMPpixelData {$pixeldataoffset + 3} ) << 24) | (ord ( $BMPpixelData {$pixeldataoffset + 2} ) << 16) | (ord ( $BMPpixelData {$pixeldataoffset + 1} ) << 8) | ord ( $BMPpixelData {$pixeldataoffset} ); 398 $pixeldataoffset += 4; 399 } 400 while ( ($pixeldataoffset % 4) != 0 ) { 401 // lines are padded to nearest DWORD 402 $pixeldataoffset ++; 403 } 404 } 405 break; 406 407 case 16 : 408 // ? 409 break; 410 411 default : 412 $info ['error'] [] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw ['bits_per_pixel'] . ') - cannot read pixel data'; 413 break; 414 } 415 break; 416 417 case 1 : // BI_RLE8 - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_6x0u.asp 418 switch ($thisfile_bmp_header_raw ['bits_per_pixel']) { 419 case 8 : 420 $pixelcounter = 0; 421 while ( $pixeldataoffset < strlen ( $BMPpixelData ) ) { 422 $firstbyte = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset ++, 1 ) ); 423 $secondbyte = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset ++, 1 ) ); 424 if ($firstbyte == 0) { 425 426 // escaped/absolute mode - the first byte of the pair can be set to zero to 427 // indicate an escape character that denotes the end of a line, the end of 428 // a bitmap, or a delta, depending on the value of the second byte. 429 switch ($secondbyte) { 430 case 0 : 431 // end of line 432 // no need for special processing, just ignore 433 break; 434 435 case 1 : 436 // end of bitmap 437 $pixeldataoffset = strlen ( $BMPpixelData ); // force to exit loop just in case 438 break; 439 440 case 2 : 441 // delta - The 2 bytes following the escape contain unsigned values 442 // indicating the horizontal and vertical offsets of the next pixel 443 // from the current position. 444 $colincrement = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset ++, 1 ) ); 445 $rowincrement = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset ++, 1 ) ); 446 $col = ($pixelcounter % $thisfile_bmp_header_raw ['width']) + $colincrement; 447 $row = ($thisfile_bmp_header_raw ['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw ['width'])) - $rowincrement; 448 $pixelcounter = ($row * $thisfile_bmp_header_raw ['width']) + $col; 449 break; 450 451 default : 452 // In absolute mode, the first byte is zero and the second byte is a 453 // value in the range 03H through FFH. The second byte represents the 454 // number of bytes that follow, each of which contains the color index 455 // of a single pixel. Each run must be aligned on a word boundary. 456 for($i = 0; $i < $secondbyte; $i ++) { 457 $paletteindex = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset ++, 1 ) ); 458 $col = $pixelcounter % $thisfile_bmp_header_raw ['width']; 459 $row = $thisfile_bmp_header_raw ['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw ['width']); 460 $thisfile_bmp ['data'] [$row] [$col] = $thisfile_bmp ['palette'] [$paletteindex]; 461 $pixelcounter ++; 462 } 463 while ( ($pixeldataoffset % 2) != 0 ) { 464 // Each run must be aligned on a word boundary. 465 $pixeldataoffset ++; 466 } 467 break; 468 } 469 470 } else { 471 472 // encoded mode - the first byte specifies the number of consecutive pixels 473 // to be drawn using the color index contained in the second byte. 474 for($i = 0; $i < $firstbyte; $i ++) { 475 $col = $pixelcounter % $thisfile_bmp_header_raw ['width']; 476 $row = $thisfile_bmp_header_raw ['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw ['width']); 477 $thisfile_bmp ['data'] [$row] [$col] = $thisfile_bmp ['palette'] [$secondbyte]; 478 $pixelcounter ++; 479 } 480 481 } 482 } 483 break; 484 485 default : 486 $info ['error'] [] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw ['bits_per_pixel'] . ') - cannot read pixel data'; 487 break; 488 } 489 break; 490 491 case 2 : // BI_RLE4 - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_6x0u.asp 492 switch ($thisfile_bmp_header_raw ['bits_per_pixel']) { 493 case 4 : 494 $pixelcounter = 0; 495 while ( $pixeldataoffset < strlen ( $BMPpixelData ) ) { 496 $firstbyte = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset ++, 1 ) ); 497 $secondbyte = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset ++, 1 ) ); 498 if ($firstbyte == 0) { 499 500 // escaped/absolute mode - the first byte of the pair can be set to zero to 501 // indicate an escape character that denotes the end of a line, the end of 502 // a bitmap, or a delta, depending on the value of the second byte. 503 switch ($secondbyte) { 504 case 0 : 505 // end of line 506 // no need for special processing, just ignore 507 break; 508 509 case 1 : 510 // end of bitmap 511 $pixeldataoffset = strlen ( $BMPpixelData ); // force to exit loop just in case 512 break; 513 514 case 2 : 515 // delta - The 2 bytes following the escape contain unsigned values 516 // indicating the horizontal and vertical offsets of the next pixel 517 // from the current position. 518 $colincrement = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset ++, 1 ) ); 519 $rowincrement = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset ++, 1 ) ); 520 $col = ($pixelcounter % $thisfile_bmp_header_raw ['width']) + $colincrement; 521 $row = ($thisfile_bmp_header_raw ['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw ['width'])) - $rowincrement; 522 $pixelcounter = ($row * $thisfile_bmp_header_raw ['width']) + $col; 523 break; 524 525 default : 526 // In absolute mode, the first byte is zero. The second byte contains the number 527 // of color indexes that follow. Subsequent bytes contain color indexes in their 528 // high- and low-order 4 bits, one color index for each pixel. In absolute mode, 529 // each run must be aligned on a word boundary. 530 unset ( $paletteindexes ); 531 for($i = 0; $i < ceil ( $secondbyte / 2 ); $i ++) { 532 $paletteindexbyte = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset ++, 1 ) ); 533 $paletteindexes [] = ($paletteindexbyte & 0xF0) >> 4; 534 $paletteindexes [] = ($paletteindexbyte & 0x0F); 535 } 536 while ( ($pixeldataoffset % 2) != 0 ) { 537 // Each run must be aligned on a word boundary. 538 $pixeldataoffset ++; 539 } 540 541 foreach ( $paletteindexes as $paletteindex ) { 542 $col = $pixelcounter % $thisfile_bmp_header_raw ['width']; 543 $row = $thisfile_bmp_header_raw ['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw ['width']); 544 $thisfile_bmp ['data'] [$row] [$col] = $thisfile_bmp ['palette'] [$paletteindex]; 545 $pixelcounter ++; 546 } 547 break; 548 } 549 550 } else { 551 552 // encoded mode - the first byte of the pair contains the number of pixels to be 553 // drawn using the color indexes in the second byte. The second byte contains two 554 // color indexes, one in its high-order 4 bits and one in its low-order 4 bits. 555 // The first of the pixels is drawn using the color specified by the high-order 556 // 4 bits, the second is drawn using the color in the low-order 4 bits, the third 557 // is drawn using the color in the high-order 4 bits, and so on, until all the 558 // pixels specified by the first byte have been drawn. 559 $paletteindexes [0] = ($secondbyte & 0xF0) >> 4; 560 $paletteindexes [1] = ($secondbyte & 0x0F); 561 for($i = 0; $i < $firstbyte; $i ++) { 562 $col = $pixelcounter % $thisfile_bmp_header_raw ['width']; 563 $row = $thisfile_bmp_header_raw ['height'] - 1 - (($pixelcounter - $col) / $thisfile_bmp_header_raw ['width']); 564 $thisfile_bmp ['data'] [$row] [$col] = $thisfile_bmp ['palette'] [$paletteindexes [($i % 2)]]; 565 $pixelcounter ++; 566 } 567 568 } 569 } 570 break; 571 572 default : 573 $info ['error'] [] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw ['bits_per_pixel'] . ') - cannot read pixel data'; 574 break; 575 } 576 break; 577 578 case 3 : // BI_BITFIELDS 579 switch ($thisfile_bmp_header_raw ['bits_per_pixel']) { 580 case 16 : 581 case 32 : 582 $redshift = 0; 583 $greenshift = 0; 584 $blueshift = 0; 585 while ( (($thisfile_bmp_header_raw ['red_mask'] >> $redshift) & 0x01) == 0 ) { 586 $redshift ++; 587 } 588 while ( (($thisfile_bmp_header_raw ['green_mask'] >> $greenshift) & 0x01) == 0 ) { 589 $greenshift ++; 590 } 591 while ( (($thisfile_bmp_header_raw ['blue_mask'] >> $blueshift) & 0x01) == 0 ) { 592 $blueshift ++; 593 } 594 for($row = ($thisfile_bmp_header_raw ['height'] - 1); $row >= 0; $row --) { 595 for($col = 0; $col < $thisfile_bmp_header_raw ['width']; $col ++) { 596 $pixelvalue = getid3_lib::LittleEndian2Int ( substr ( $BMPpixelData, $pixeldataoffset, $thisfile_bmp_header_raw ['bits_per_pixel'] / 8 ) ); 597 $pixeldataoffset += $thisfile_bmp_header_raw ['bits_per_pixel'] / 8; 598 599 $red = intval ( round ( ((($pixelvalue & $thisfile_bmp_header_raw ['red_mask']) >> $redshift) / ($thisfile_bmp_header_raw ['red_mask'] >> $redshift)) * 255 ) ); 600 $green = intval ( round ( ((($pixelvalue & $thisfile_bmp_header_raw ['green_mask']) >> $greenshift) / ($thisfile_bmp_header_raw ['green_mask'] >> $greenshift)) * 255 ) ); 601 $blue = intval ( round ( ((($pixelvalue & $thisfile_bmp_header_raw ['blue_mask']) >> $blueshift) / ($thisfile_bmp_header_raw ['blue_mask'] >> $blueshift)) * 255 ) ); 602 $thisfile_bmp ['data'] [$row] [$col] = (($red << 16) | ($green << 8) | ($blue)); 603 } 604 while ( ($pixeldataoffset % 4) != 0 ) { 605 // lines are padded to nearest DWORD 606 $pixeldataoffset ++; 607 } 608 } 609 break; 610 611 default : 612 $info ['error'] [] = 'Unknown bits-per-pixel value (' . $thisfile_bmp_header_raw ['bits_per_pixel'] . ') - cannot read pixel data'; 613 break; 614 } 615 break; 616 617 default : // unhandled compression type 618 $info ['error'] [] = 'Unknown/unhandled compression type value (' . $thisfile_bmp_header_raw ['compression'] . ') - cannot decompress pixel data'; 619 break; 620 } 621 } 622 623 return true; 624 } 625 626 function PlotBMP(&$BMPinfo) { 627 $starttime = time (); 628 if (! isset ( $BMPinfo ['bmp'] ['data'] ) || ! is_array ( $BMPinfo ['bmp'] ['data'] )) { 629 echo 'ERROR: no pixel data<BR>'; 630 return false; 631 } 632 set_time_limit ( intval ( round ( $BMPinfo ['resolution_x'] * $BMPinfo ['resolution_y'] / 10000 ) ) ); 633 if (($im = ImageCreateTrueColor ( $BMPinfo ['resolution_x'], $BMPinfo ['resolution_y'] )) != false) { 634 for($row = 0; $row < $BMPinfo ['resolution_y']; $row ++) { 635 for($col = 0; $col < $BMPinfo ['resolution_x']; $col ++) { 636 if (isset ( $BMPinfo ['bmp'] ['data'] [$row] [$col] )) { 637 $red = ($BMPinfo ['bmp'] ['data'] [$row] [$col] & 0x00FF0000) >> 16; 638 $green = ($BMPinfo ['bmp'] ['data'] [$row] [$col] & 0x0000FF00) >> 8; 639 $blue = ($BMPinfo ['bmp'] ['data'] [$row] [$col] & 0x000000FF); 640 $pixelcolor = ImageColorAllocate ( $im, $red, $green, $blue ); 641 ImageSetPixel ( $im, $col, $row, $pixelcolor ); 642 } else { 643 //echo 'ERROR: no data for pixel '.$row.' x '.$col.'<BR>'; 644 //return false; 645 } 646 } 647 } 648 if (headers_sent ()) { 649 echo 'plotted ' . ($BMPinfo ['resolution_x'] * $BMPinfo ['resolution_y']) . ' pixels in ' . (time () - $starttime) . ' seconds<BR>'; 650 ImageDestroy ( $im ); 651 exit (); 652 } else { 653 header ( 'Content-type: image/png' ); 654 ImagePNG ( $im ); 655 ImageDestroy ( $im ); 656 return true; 657 } 658 } 659 return false; 660 } 661 662 function BMPcompressionWindowsLookup($compressionid) { 663 static $BMPcompressionWindowsLookup = array ( 664 0 => 'BI_RGB', 665 1 => 'BI_RLE8', 666 2 => 'BI_RLE4', 667 3 => 'BI_BITFIELDS', 668 4 => 'BI_JPEG', 669 5 => 'BI_PNG' ); 670 return (isset ( $BMPcompressionWindowsLookup [$compressionid] ) ? $BMPcompressionWindowsLookup [$compressionid] : 'invalid'); 671 } 672 673 function BMPcompressionOS2Lookup($compressionid) { 674 static $BMPcompressionOS2Lookup = array ( 675 0 => 'BI_RGB', 676 1 => 'BI_RLE8', 677 2 => 'BI_RLE4', 678 3 => 'Huffman 1D', 679 4 => 'BI_RLE24' ); 680 return (isset ( $BMPcompressionOS2Lookup [$compressionid] ) ? $BMPcompressionOS2Lookup [$compressionid] : 'invalid'); 681 } 682 683} 684 685