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445 lines
15 KiB
445 lines
15 KiB
<?php |
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/** |
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* Copyright (c) 2011, oov. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without modification, |
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* are permitted provided that the following conditions are met: |
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* |
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* - Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* - Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* - Neither the name of the oov nor the names of its contributors may be used to |
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* endorse or promote products derived from this software without specific prior |
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* written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, |
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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* bmp ファイルを GD で使えるように |
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* |
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* 使用例: |
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* //ファイルから読み込む場合はGDでPNGなどを読み込むのと同じような方法で可 |
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* $image = imagecreatefrombmp("test.bmp"); |
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* imagedestroy($image); |
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* |
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* //文字列から読み込む場合は以下の方法で可 |
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* $image = GdBmp::loadFromString(file_get_contents("test.bmp")); |
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* //自動判定されるので破損ファイルでなければこれでも上手くいく |
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* //$image = imagecreatefrombmp(file_get_contents("test.bmp")); |
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* imagedestroy($image); |
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* |
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* //その他任意のストリームからの読み込みも可能 |
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* $stream = fopen("http://127.0.0.1/test.bmp"); |
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* $image = GdBmp::loadFromStream($stream); |
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* //自動判定されるのでこれでもいい |
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* //$image = imagecreatefrombmp($stream); |
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* fclose($stream); |
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* imagedestroy($image); |
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* |
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* 対応フォーマット |
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* 1bit |
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* 4bit |
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* 4bitRLE |
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* 8bit |
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* 8bitRLE |
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* 16bit(任意のビットフィールド) |
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* 24bit |
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* 32bit(任意のビットフィールド) |
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* BITMAPINFOHEADER の biCompression が BI_PNG / BI_JPEG の画像 |
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* すべての形式でトップダウン/ボトムアップの両方をサポート |
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* 特殊なビットフィールドでもビットフィールドデータが正常なら読み込み可能 |
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* |
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* 以下のものは非対応 |
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* BITMAPV4HEADER と BITMAPV5HEADER に含まれる色空間に関する様々な機能 |
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* @param $filename_or_stream_or_binary |
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* @return bool|resource |
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*/ |
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function imagecreatefrombmp($filename_or_stream_or_binary){ |
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return elFinderLibGdBmp::load($filename_or_stream_or_binary); |
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} |
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class elFinderLibGdBmp{ |
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public static function load($filename_or_stream_or_binary){ |
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if (is_resource($filename_or_stream_or_binary)){ |
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return self::loadFromStream($filename_or_stream_or_binary); |
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} else if (is_string($filename_or_stream_or_binary) && strlen($filename_or_stream_or_binary) >= 26){ |
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$bfh = unpack("vtype/Vsize", $filename_or_stream_or_binary); |
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if ($bfh["type"] == 0x4d42 && ($bfh["size"] == 0 || $bfh["size"] == strlen($filename_or_stream_or_binary))){ |
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return self::loadFromString($filename_or_stream_or_binary); |
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} |
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} |
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return self::loadFromFile($filename_or_stream_or_binary); |
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} |
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public static function loadFromFile($filename){ |
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$fp = fopen($filename, "rb"); |
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if ($fp === false){ |
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return false; |
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} |
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$bmp = self::loadFromStream($fp); |
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fclose($fp); |
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return $bmp; |
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} |
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public static function loadFromString($str){ |
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//data scheme より古いバージョンから対応しているようなので php://memory を使う |
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$fp = fopen("php://memory", "r+b"); |
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if ($fp === false){ |
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return false; |
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} |
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if (fwrite($fp, $str) != strlen($str)){ |
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fclose($fp); |
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return false; |
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} |
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if (fseek($fp, 0) === -1){ |
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fclose($fp); |
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return false; |
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} |
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$bmp = self::loadFromStream($fp); |
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fclose($fp); |
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return $bmp; |
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} |
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public static function loadFromStream($stream){ |
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$buf = fread($stream, 14); //2+4+2+2+4 |
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if ($buf === false){ |
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return false; |
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} |
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//シグネチャチェック |
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if ($buf[0] != 'B' || $buf[1] != 'M'){ |
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return false; |
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} |
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$bitmap_file_header = unpack( |
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//BITMAPFILEHEADER構造体 |
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"vtype/". |
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"Vsize/". |
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"vreserved1/". |
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"vreserved2/". |
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"Voffbits", $buf |
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); |
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return self::loadFromStreamAndFileHeader($stream, $bitmap_file_header); |
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} |
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public static function loadFromStreamAndFileHeader($stream, array $bitmap_file_header){ |
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if ($bitmap_file_header["type"] != 0x4d42){ |
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return false; |
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} |
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//情報ヘッダサイズを元に形式を区別して読み込み |
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$buf = fread($stream, 4); |
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if ($buf === false){ |
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return false; |
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} |
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list(,$header_size) = unpack("V", $buf); |
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if ($header_size == 12){ |
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$buf = fread($stream, $header_size - 4); |
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if ($buf === false){ |
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return false; |
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} |
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extract(unpack( |
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//BITMAPCOREHEADER構造体 - OS/2 Bitmap |
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"vwidth/". |
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"vheight/". |
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"vplanes/". |
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"vbit_count", $buf |
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)); |
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//飛んでこない分は 0 で初期化しておく |
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$clr_used = $clr_important = $alpha_mask = $compression = 0; |
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//マスク類は初期化されないのでここで割り当てておく |
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$red_mask = 0x00ff0000; |
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$green_mask = 0x0000ff00; |
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$blue_mask = 0x000000ff; |
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} else if (124 < $header_size || $header_size < 40) { |
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//未知の形式 |
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return false; |
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} else { |
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//この時点で36バイト読めることまではわかっている |
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$buf = fread($stream, 36); //既に読んだ部分は除外しつつBITMAPINFOHEADERのサイズだけ読む |
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if ($buf === false){ |
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return false; |
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} |
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//BITMAPINFOHEADER構造体 - Windows Bitmap |
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extract(unpack( |
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"Vwidth/". |
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"Vheight/". |
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"vplanes/". |
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"vbit_count/". |
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"Vcompression/". |
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"Vsize_image/". |
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"Vx_pels_per_meter/". |
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"Vy_pels_per_meter/". |
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"Vclr_used/". |
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"Vclr_important", $buf |
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)); |
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//負の整数を受け取る可能性があるものは自前で変換する |
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if ($width & 0x80000000){ $width = -(~$width & 0xffffffff) - 1; } |
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if ($height & 0x80000000){ $height = -(~$height & 0xffffffff) - 1; } |
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if ($x_pels_per_meter & 0x80000000){ $x_pels_per_meter = -(~$x_pels_per_meter & 0xffffffff) - 1; } |
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if ($y_pels_per_meter & 0x80000000){ $y_pels_per_meter = -(~$y_pels_per_meter & 0xffffffff) - 1; } |
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//ファイルによっては BITMAPINFOHEADER のサイズがおかしい（書き込み間違い？）ケースがある |
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//自分でファイルサイズを元に逆算することで回避できることもあるので再計算できそうなら正当性を調べる |
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//シークできないストリームの場合全体のファイルサイズは取得できないので、$bitmap_file_headerにサイズ申告がなければやらない |
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if ($bitmap_file_header["size"] != 0){ |
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$colorsize = $bit_count == 1 || $bit_count == 4 || $bit_count == 8 ? ($clr_used ? $clr_used : pow(2, $bit_count))<<2 : 0; |
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$bodysize = $size_image ? $size_image : ((($width * $bit_count + 31) >> 3) & ~3) * abs($height); |
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$calcsize = $bitmap_file_header["size"] - $bodysize - $colorsize - 14; |
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//本来であれば一致するはずなのに合わない時は、値がおかしくなさそうなら（BITMAPV5HEADERの範囲内なら）計算して求めた値を採用する |
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if ($header_size < $calcsize && 40 <= $header_size && $header_size <= 124){ |
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$header_size = $calcsize; |
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} |
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} |
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//BITMAPV4HEADER や BITMAPV5HEADER の場合まだ読むべきデータが残っている可能性がある |
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if ($header_size - 40 > 0){ |
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$buf = fread($stream, $header_size - 40); |
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if ($buf === false){ |
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return false; |
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} |
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extract(unpack( |
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//BITMAPV4HEADER構造体(Windows95以降) |
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//BITMAPV5HEADER構造体(Windows98/2000以降) |
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"Vred_mask/". |
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"Vgreen_mask/". |
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"Vblue_mask/". |
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"Valpha_mask", $buf . str_repeat("\x00", 120) |
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)); |
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} else { |
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$alpha_mask = $red_mask = $green_mask = $blue_mask = 0; |
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} |
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//パレットがないがカラーマスクもない時 |
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if ( |
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($bit_count == 16 || $bit_count == 24 || $bit_count == 32)&& |
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$compression == 0 && |
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$red_mask == 0 && $green_mask == 0 && $blue_mask == 0 |
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){ |
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//もしカラーマスクを所持していない場合は |
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//規定のカラーマスクを適用する |
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switch($bit_count){ |
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case 16: |
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$red_mask = 0x7c00; |
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$green_mask = 0x03e0; |
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$blue_mask = 0x001f; |
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break; |
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case 24: |
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case 32: |
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$red_mask = 0x00ff0000; |
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$green_mask = 0x0000ff00; |
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$blue_mask = 0x000000ff; |
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break; |
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} |
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} |
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} |
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if ( |
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($width == 0)|| |
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($height == 0)|| |
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($planes != 1)|| |
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(($alpha_mask & $red_mask ) != 0)|| |
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(($alpha_mask & $green_mask) != 0)|| |
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(($alpha_mask & $blue_mask ) != 0)|| |
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(($red_mask & $green_mask) != 0)|| |
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(($red_mask & $blue_mask ) != 0)|| |
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(($green_mask & $blue_mask ) != 0) |
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){ |
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//不正な画像 |
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return false; |
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} |
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//BI_JPEG と BI_PNG の場合は jpeg/png がそのまま入ってるだけなのでそのまま取り出してデコードする |
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if ($compression == 4 || $compression == 5){ |
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$buf = stream_get_contents($stream, $size_image); |
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if ($buf === false){ |
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return false; |
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} |
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return imagecreatefromstring($buf); |
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} |
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//画像本体の読み出し |
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//1行のバイト数 |
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$line_bytes = (($width * $bit_count + 31) >> 3) & ~3; |
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//全体の行数 |
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$lines = abs($height); |
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//y軸進行量（ボトムアップかトップダウンか） |
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$y = $height > 0 ? $lines-1 : 0; |
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$line_step = $height > 0 ? -1 : 1; |
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//256色以下の画像か？ |
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if ($bit_count == 1 || $bit_count == 4 || $bit_count == 8){ |
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$img = imagecreate($width, $lines); |
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//画像データの前にパレットデータがあるのでパレットを作成する |
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$palette_size = $header_size == 12 ? 3 : 4; //OS/2形式の場合は x に相当する箇所のデータは最初から確保されていない |
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$colors = $clr_used ? $clr_used : pow(2, $bit_count); //色数 |
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$palette = array(); |
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for($i = 0; $i < $colors; ++$i){ |
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$buf = fread($stream, $palette_size); |
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if ($buf === false){ |
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imagedestroy($img); |
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return false; |
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} |
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extract(unpack("Cb/Cg/Cr/Cx", $buf . "\x00")); |
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$palette[] = imagecolorallocate($img, $r, $g, $b); |
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} |
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$shift_base = 8 - $bit_count; |
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$mask = ((1 << $bit_count) - 1) << $shift_base; |
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//圧縮されている場合とされていない場合でデコード処理が大きく変わる |
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if ($compression == 1 || $compression == 2){ |
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$x = 0; |
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$qrt_mod2 = $bit_count >> 2 & 1; |
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for(;;){ |
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//もし描写先が範囲外になっている場合デコード処理がおかしくなっているので抜ける |
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//変なデータが渡されたとしても最悪なケースで255回程度の無駄なので目を瞑る |
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if ($x < -1 || $x > $width || $y < -1 || $y > $height){ |
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imagedestroy($img); |
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return false; |
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} |
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$buf = fread($stream, 1); |
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if ($buf === false){ |
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imagedestroy($img); |
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return false; |
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} |
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switch($buf){ |
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case "\x00": |
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$buf = fread($stream, 1); |
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if ($buf === false){ |
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imagedestroy($img); |
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return false; |
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} |
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switch($buf){ |
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case "\x00": //EOL |
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$y += $line_step; |
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$x = 0; |
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break; |
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case "\x01": //EOB |
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$y = 0; |
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$x = 0; |
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break 3; |
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case "\x02": //MOV |
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$buf = fread($stream, 2); |
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if ($buf === false){ |
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imagedestroy($img); |
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return false; |
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} |
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list(,$xx, $yy) = unpack("C2", $buf); |
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$x += $xx; |
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$y += $yy * $line_step; |
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break; |
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default: //ABS |
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list(,$pixels) = unpack("C", $buf); |
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$bytes = ($pixels >> $qrt_mod2) + ($pixels & $qrt_mod2); |
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$buf = fread($stream, ($bytes + 1) & ~1); |
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if ($buf === false){ |
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imagedestroy($img); |
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return false; |
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} |
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for ($i = 0, $pos = 0; $i < $pixels; ++$i, ++$x, $pos += $bit_count){ |
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list(,$c) = unpack("C", $buf[$pos >> 3]); |
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$b = $pos & 0x07; |
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imagesetpixel($img, $x, $y, $palette[($c & ($mask >> $b)) >> ($shift_base - $b)]); |
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} |
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break; |
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} |
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break; |
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default: |
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$buf2 = fread($stream, 1); |
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if ($buf2 === false){ |
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imagedestroy($img); |
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return false; |
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} |
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list(,$size, $c) = unpack("C2", $buf . $buf2); |
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for($i = 0, $pos = 0; $i < $size; ++$i, ++$x, $pos += $bit_count){ |
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$b = $pos & 0x07; |
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imagesetpixel($img, $x, $y, $palette[($c & ($mask >> $b)) >> ($shift_base - $b)]); |
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} |
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break; |
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} |
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} |
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} else { |
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for ($line = 0; $line < $lines; ++$line, $y += $line_step){ |
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$buf = fread($stream, $line_bytes); |
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if ($buf === false){ |
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imagedestroy($img); |
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return false; |
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} |
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$pos = 0; |
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for ($x = 0; $x < $width; ++$x, $pos += $bit_count){ |
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list(,$c) = unpack("C", $buf[$pos >> 3]); |
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$b = $pos & 0x7; |
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imagesetpixel($img, $x, $y, $palette[($c & ($mask >> $b)) >> ($shift_base - $b)]); |
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} |
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} |
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} |
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} else { |
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$img = imagecreatetruecolor($width, $lines); |
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imagealphablending($img, false); |
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if ($alpha_mask) |
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{ |
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//αデータがあるので透過情報も保存できるように |
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imagesavealpha($img, true); |
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} |
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//x軸進行量 |
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$pixel_step = $bit_count >> 3; |
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$alpha_max = $alpha_mask ? 0x7f : 0x00; |
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$alpha_mask_r = $alpha_mask ? 1/$alpha_mask : 1; |
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$red_mask_r = $red_mask ? 1/$red_mask : 1; |
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$green_mask_r = $green_mask ? 1/$green_mask : 1; |
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$blue_mask_r = $blue_mask ? 1/$blue_mask : 1; |
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for ($line = 0; $line < $lines; ++$line, $y += $line_step){ |
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$buf = fread($stream, $line_bytes); |
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if ($buf === false){ |
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imagedestroy($img); |
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return false; |
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} |
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$pos = 0; |
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for ($x = 0; $x < $width; ++$x, $pos += $pixel_step){ |
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list(,$c) = unpack("V", substr($buf, $pos, $pixel_step). "\x00\x00"); |
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$a_masked = $c & $alpha_mask; |
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$r_masked = $c & $red_mask; |
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$g_masked = $c & $green_mask; |
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$b_masked = $c & $blue_mask; |
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$a = $alpha_max - ((($a_masked<<7) - $a_masked) * $alpha_mask_r); |
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$r = (($r_masked<<8) - $r_masked) * $red_mask_r; |
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$g = (($g_masked<<8) - $g_masked) * $green_mask_r; |
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$b = (($b_masked<<8) - $b_masked) * $blue_mask_r; |
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imagesetpixel($img, $x, $y, ($a<<24)|($r<<16)|($g<<8)|$b); |
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} |
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} |
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imagealphablending($img, true); //デフォルト値に戻しておく |
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} |
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return $img; |
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} |
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}
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