Merge pull request #16667 from owncloud/issue-16510-fix-encryption-with-s2s-shares - nextcloud-server.git - Nextcloud server, a safe home for all your data: https://github.com/nextcloud/server

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author	Morris Jobke <hey@morrisjobke.de>	2015-06-02 16:42:32 +0200
committer	Morris Jobke <hey@morrisjobke.de>	2015-06-02 16:42:32 +0200
commit	259937680b79044701331eed8bff98e3acd12e6c (patch)
tree	0f084e5e9d6c62042c6a9fd624e8dbda33ca5b27
parent	3ebc8f0564395fbb519fc4275e0f6f883df708b7 (diff)
parent	be1f319511b3faaf4552ec68a6697b4dda1f5c6c (diff)
download	nextcloud-server-259937680b79044701331eed8bff98e3acd12e6c.tar.gz nextcloud-server-259937680b79044701331eed8bff98e3acd12e6c.zip

Merge pull request #16667 from owncloud/issue-16510-fix-encryption-with-s2s-shares

Add tests for the storage wrapper and fix the wrapping

Diffstat

-rw-r--r--

lib/private/encryption/manager.php

-rw-r--r--

lib/private/encryption/util.php

-rw-r--r--

tests/lib/encryption/utiltest.php

3 files changed, 106 insertions, 43 deletions

<?php /** * ownCloud * * @author Thomas Tanghus * @copyright 2011 Thomas Tanghus <thomas@tanghus.net> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE * License as published by the Free Software Foundation; either * version 3 of the License, or any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU AFFERO GENERAL PUBLIC LICENSE for more details. * * You should have received a copy of the GNU Affero General Public * License along with this library. If not, see <http://www.gnu.org/licenses/>. * */ /** * Class for basic image manipulation */ class OC_Image { protected $resource = false; // tmp resource. protected $imageType = IMAGETYPE_PNG; // Default to png if file type isn't evident. protected $mimeType = "image/png"; // Default to png protected $bitDepth = 24; protected $filePath = null; private $fileInfo; /** * @brief Get mime type for an image file. * @param string|null $filepath The path to a local image file. * @returns string The mime type if the it could be determined, otherwise an empty string. */ static public function getMimeTypeForFile($filePath) { // exif_imagetype throws "read error!" if file is less than 12 byte if (filesize($filePath) > 11) { $imageType = exif_imagetype($filePath); } else { $imageType = false; } return $imageType ? image_type_to_mime_type($imageType) : ''; } /** * @brief Constructor. * @param $imageref The path to a local file, a base64 encoded string or a resource created by an imagecreate* function. * @returns bool False on error */ public function __construct($imageRef = null) { //OC_Log::write('core',__METHOD__.'(): start', OC_Log::DEBUG); if(!extension_loaded('gd') || !function_exists('gd_info')) { OC_Log::write('core', __METHOD__.'(): GD module not installed', OC_Log::ERROR); return false; } if (\OC_Util::fileInfoLoaded()) { $this->fileInfo = new finfo(FILEINFO_MIME_TYPE); } if(!is_null($imageRef)) { $this->load($imageRef); } } /** * @brief Determine whether the object contains an image resource. * @returns bool */ public function valid() { // apparently you can't name a method 'empty'... return is_resource($this->resource); } /** * @brief Returns the MIME type of the image or an empty string if no image is loaded. * @returns int */ public function mimeType() { return $this->valid() ? $this->mimeType : ''; } /** * @brief Returns the width of the image or -1 if no image is loaded. * @returns int */ public function width() { return $this->valid() ? imagesx($this->resource) : -1; } /** * @brief Returns the height of the image or -1 if no image is loaded. * @returns int */ public function height() { return $this->valid() ? imagesy($this->resource) : -1; } /** * @brief Returns the width when the image orientation is top-left. * @returns int */ public function widthTopLeft() { $o = $this->getOrientation(); OC_Log::write('core', 'OC_Image->widthTopLeft() Orientation: '.$o, OC_Log::DEBUG); switch($o) { case -1: case 1: case 2: // Not tested case 3: case 4: // Not tested return $this->width(); break; case 5: // Not tested case 6: case 7: // Not tested case 8: return $this->height(); break; } return $this->width(); } /** * @brief Returns the height when the image orientation is top-left. * @returns int */ public function heightTopLeft() { $o = $this->getOrientation(); OC_Log::write('core', 'OC_Image->heightTopLeft() Orientation: '.$o, OC_Log::DEBUG); switch($o) { case -1: case 1: case 2: // Not tested case 3: case 4: // Not tested return $this->height(); break; case 5: // Not tested case 6: case 7: // Not tested case 8: return $this->width(); break; } return $this->height(); } /** * @brief Outputs the image. * @returns bool */ public function show() { header('Content-Type: '.$this->mimeType()); return $this->_output(); } /** * @brief Saves the image. * @returns bool * @param string $filePath */ public function save($filePath=null) { if($filePath === null && $this->filePath === null) { OC_Log::write('core', __METHOD__.'(): called with no path.', OC_Log::ERROR); return false; } elseif($filePath === null && $this->filePath !== null) { $filePath = $this->filePath; } return $this->_output($filePath); } /** * @brief Outputs/saves the image. */ private function _output($filePath=null) { if($filePath) { if (!file_exists(dirname($filePath))) mkdir(dirname($filePath), 0777, true); if(!is_writable(dirname($filePath))) { OC_Log::write('core', __METHOD__.'(): Directory \''.dirname($filePath).'\' is not writable.', OC_Log::ERROR); return false; } elseif(is_writable(dirname($filePath)) && file_exists($filePath) && !is_writable($filePath)) { OC_Log::write('core', __METHOD__.'(): File \''.$filePath.'\' is not writable.', OC_Log::ERROR); return false; } } if (!$this->valid()) { return false; } $retVal = false; switch($this->imageType) { case IMAGETYPE_GIF: $retVal = imagegif($this->resource, $filePath); break; case IMAGETYPE_JPEG: $retVal = imagejpeg($this->resource, $filePath); break; case IMAGETYPE_PNG: $retVal = imagepng($this->resource, $filePath); break; case IMAGETYPE_XBM: $retVal = imagexbm($this->resource, $filePath); break; case IMAGETYPE_WBMP: $retVal = imagewbmp($this->resource, $filePath); break; case IMAGETYPE_BMP: $retVal = imagebmp($this->resource, $filePath, $this->bitDepth); break; default: $retVal = imagepng($this->resource, $filePath); } return $retVal; } /** * @brief Prints the image when called as $image(). */ public function __invoke() { return $this->show(); } /** * @returns resource Returns the image resource in any. */ public function resource() { return $this->resource; } /** * @returns Returns the raw image data. */ function data() { ob_start(); switch ($this->mimeType) { case "image/png": $res = imagepng($this->resource); break; case "image/jpeg": $res = imagejpeg($this->resource); break; case "image/gif": $res = imagegif($this->resource); break; default: $res = imagepng($this->resource); OC_Log::write('core', 'OC_Image->data. Couldn\'t guess mimetype, defaulting to png', OC_Log::INFO); break; } if (!$res) { OC_Log::write('core', 'OC_Image->data. Error getting image data.', OC_Log::ERROR); } return ob_get_clean(); } /** * @returns Returns a base64 encoded string suitable for embedding in a VCard. */ function __toString() { return base64_encode($this->data()); } /** * (I'm open for suggestions on better method name ;) * @brief Get the orientation based on EXIF data. * @returns The orientation or -1 if no EXIF data is available. */ public function getOrientation() { if(!is_callable('exif_read_data')) { OC_Log::write('core', 'OC_Image->fixOrientation() Exif module not enabled.', OC_Log::DEBUG); return -1; } if(!$this->valid()) { OC_Log::write('core', 'OC_Image->fixOrientation() No image loaded.', OC_Log::DEBUG); return -1; } if(is_null($this->filePath) || !is_readable($this->filePath)) { OC_Log::write('core', 'OC_Image->fixOrientation() No readable file path set.', OC_Log::DEBUG); return -1; } $exif = @exif_read_data($this->filePath, 'IFD0'); if(!$exif) { return -1; } if(!isset($exif['Orientation'])) { return -1; } return $exif['Orientation']; } /** * (I'm open for suggestions on better method name ;) * @brief Fixes orientation based on EXIF data. * @returns bool. */ public function fixOrientation() { $o = $this->getOrientation(); OC_Log::write('core', 'OC_Image->fixOrientation() Orientation: '.$o, OC_Log::DEBUG); $rotate = 0; $flip = false; switch($o) { case -1: return false; //Nothing to fix break; case 1: $rotate = 0; $flip = false; break; case 2: // Not tested $rotate = 0; $flip = true; break; case 3: $rotate = 180; $flip = false; break; case 4: // Not tested $rotate = 180; $flip = true; break; case 5: // Not tested $rotate = 90; $flip = true; break; case 6: //$rotate = 90; $rotate = 270; $flip = false; break; case 7: // Not tested $rotate = 270; $flip = true; break; case 8: $rotate = 90; $flip = false; break; } if($rotate) { $res = imagerotate($this->resource, $rotate, -1); if($res) { if(imagealphablending($res, true)) { if(imagesavealpha($res, true)) { imagedestroy($this->resource); $this->resource = $res; return true; } else { OC_Log::write('core', 'OC_Image->fixOrientation() Error during alphasaving.', OC_Log::DEBUG); return false; } } else { OC_Log::write('core', 'OC_Image->fixOrientation() Error during alphablending.', OC_Log::DEBUG); return false; } } else { OC_Log::write('core', 'OC_Image->fixOrientation() Error during oriention fixing.', OC_Log::DEBUG); return false; } } } /** * @brief Loads an image from a local file, a base64 encoded string or a resource created by an imagecreate* function. * @param $imageref The path to a local file, a base64 encoded string or a resource created by an imagecreate* function or a file resource (file handle ). * @returns An image resource or false on error */ public function load($imageRef) { if(is_resource($imageRef)) { if(get_resource_type($imageRef) == 'gd') { $this->resource = $imageRef; return $this->resource; } elseif(in_array(get_resource_type($imageRef), array('file', 'stream'))) { return $this->loadFromFileHandle($imageRef); } } elseif($this->loadFromFile($imageRef) !== false) { return $this->resource; } elseif($this->loadFromBase64($imageRef) !== false) { return $this->resource; } elseif($this->loadFromData($imageRef) !== false) { return $this->resource; } else { OC_Log::write('core', __METHOD__.'(): couldn\'t load anything. Giving up!', OC_Log::DEBUG); return false; } } /** * @brief Loads an image from an open file handle. * It is the responsibility of the caller to position the pointer at the correct place and to close the handle again. * @param resource $handle * @returns An image resource or false on error */ public function loadFromFileHandle($handle) { OC_Log::write('core', __METHOD__.'(): Trying', OC_Log::DEBUG); $contents = stream_get_contents($handle); if($this->loadFromData($contents)) { return $this->resource; } } /** * @brief Loads an image from a local file. * @param $imagePath The path to a local file. * @returns An image resource or false on error */ public function loadFromFile($imagePath=false) { // exif_imagetype throws "read error!" if file is less than 12 byte if(!@is_file($imagePath) || !file_exists($imagePath) || filesize($imagePath) < 12 || !is_readable($imagePath)) { // Debug output disabled because this method is tried before loadFromBase64? OC_Log::write('core', 'OC_Image->loadFromFile, couldn\'t load: ' . (string) urlencode($imagePath), OC_Log::DEBUG); return false; } $iType = exif_imagetype($imagePath); switch ($iType) { case IMAGETYPE_GIF: if (imagetypes() & IMG_GIF) { $this->resource = imagecreatefromgif($imagePath); } else { OC_Log::write('core', 'OC_Image->loadFromFile, GIF images not supported: '.$imagePath, OC_Log::DEBUG); } break; case IMAGETYPE_JPEG: if (imagetypes() & IMG_JPG) { $this->resource = imagecreatefromjpeg($imagePath); } else { OC_Log::write('core', 'OC_Image->loadFromFile, JPG images not supported: '.$imagePath, OC_Log::DEBUG); } break; case IMAGETYPE_PNG: if (imagetypes() & IMG_PNG) { $this->resource = imagecreatefrompng($imagePath); } else { OC_Log::write('core', 'OC_Image->loadFromFile, PNG images not supported: '.$imagePath, OC_Log::DEBUG); } break; case IMAGETYPE_XBM: if (imagetypes() & IMG_XPM) { $this->resource = imagecreatefromxbm($imagePath); } else { OC_Log::write('core', 'OC_Image->loadFromFile, XBM/XPM images not supported: '.$imagePath, OC_Log::DEBUG); } break; case IMAGETYPE_WBMP: if (imagetypes() & IMG_WBMP) { $this->resource = imagecreatefromwbmp($imagePath); } else { OC_Log::write('core', 'OC_Image->loadFromFile, WBMP images not supported: '.$imagePath, OC_Log::DEBUG); } break; case IMAGETYPE_BMP: $this->resource = $this->imagecreatefrombmp($imagePath); break; /* case IMAGETYPE_TIFF_II: // (intel byte order) break; case IMAGETYPE_TIFF_MM: // (motorola byte order) break; case IMAGETYPE_JPC: break; case IMAGETYPE_JP2: break; case IMAGETYPE_JPX: break; case IMAGETYPE_JB2: break; case IMAGETYPE_SWC: break; case IMAGETYPE_IFF: break; case IMAGETYPE_ICO: break; case IMAGETYPE_SWF: break; case IMAGETYPE_PSD: break; */ default: // this is mostly file created from encrypted file $this->resource = imagecreatefromstring(\OC\Files\Filesystem::file_get_contents(\OC\Files\Filesystem::getLocalPath($imagePath))); $iType = IMAGETYPE_PNG; OC_Log::write('core', 'OC_Image->loadFromFile, Default', OC_Log::DEBUG); break; } if($this->valid()) { $this->imageType = $iType; $this->mimeType = image_type_to_mime_type($iType); $this->filePath = $imagePath; } return $this->resource; } /** * @brief Loads an image from a string of data. * @param $str A string of image data as read from a file. * @returns An image resource or false on error */ public function loadFromData($str) { if(is_resource($str)) { return false; } $this->resource = @imagecreatefromstring($str); if ($this->fileInfo) { $this->mimeType = $this->fileInfo->buffer($str); } if(is_resource($this->resource)) { imagealphablending($this->resource, false); imagesavealpha($this->resource, true); } if(!$this->resource) { OC_Log::write('core', 'OC_Image->loadFromData, couldn\'t load', OC_Log::DEBUG); return false; } return $this->resource; } /** * @brief Loads an image from a base64 encoded string. * @param $str A string base64 encoded string of image data. * @returns An image resource or false on error */ public function loadFromBase64($str) { if(!is_string($str)) { return false; } $data = base64_decode($str); if($data) { // try to load from string data $this->resource = @imagecreatefromstring($data); if ($this->fileInfo) { $this->mimeType = $this->fileInfo->buffer($data); } if(!$this->resource) { OC_Log::write('core', 'OC_Image->loadFromBase64, couldn\'t load', OC_Log::DEBUG); return false; } return $this->resource; } else { return false; } } /** * Create a new image from file or URL * @link http://www.programmierer-forum.de/function-imagecreatefrombmp-laeuft-mit-allen-bitraten-t143137.htm * @version 1.00 * @param string $fileName * Path to the BMP image. * * @return resource an image resource identifier on success, FALSE on errors. */ private function imagecreatefrombmp($fileName) { if (!($fh = fopen($fileName, 'rb'))) { trigger_error('imagecreatefrombmp: Can not open ' . $fileName, E_USER_WARNING); return false; } // read file header $meta = unpack('vtype/Vfilesize/Vreserved/Voffset', fread($fh, 14)); // check for bitmap if ($meta['type'] != 19778) { trigger_error('imagecreatefrombmp: ' . $fileName . ' is not a bitmap!', E_USER_WARNING); return false; } // read image header $meta += unpack('Vheadersize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vcolors/Vimportant', fread($fh, 40)); // read additional 16bit header if ($meta['bits'] == 16) { $meta += unpack('VrMask/VgMask/VbMask', fread($fh, 12)); } // set bytes and padding $meta['bytes'] = $meta['bits'] / 8; $this->bitDepth = $meta['bits']; //remember the bit depth for the imagebmp call $meta['decal'] = 4 - (4 * (($meta['width'] * $meta['bytes'] / 4)- floor($meta['width'] * $meta['bytes'] / 4))); if ($meta['decal'] == 4) { $meta['decal'] = 0; } // obtain imagesize if ($meta['imagesize'] < 1) { $meta['imagesize'] = $meta['filesize'] - $meta['offset']; // in rare cases filesize is equal to offset so we need to read physical size if ($meta['imagesize'] < 1) { $meta['imagesize'] = @filesize($filename) - $meta['offset']; if ($meta['imagesize'] < 1) { trigger_error('imagecreatefrombmp: Can not obtain filesize of ' . $filename . '!', E_USER_WARNING); return false; } } } // calculate colors $meta['colors'] = !$meta['colors'] ? pow(2, $meta['bits']) : $meta['colors']; // read color palette $palette = array(); if ($meta['bits'] < 16) { $palette = unpack('l' . $meta['colors'], fread($fh, $meta['colors'] * 4)); // in rare cases the color value is signed if ($palette[1] < 0) { foreach ($palette as $i => $color) { $palette[$i] = $color + 16777216; } } } // create gd image $im = imagecreatetruecolor($meta['width'], $meta['height']); $data = fread($fh, $meta['imagesize']); $p = 0; $vide = chr(0); $y = $meta['height'] - 1; $error = 'imagecreatefrombmp: ' . $fileName . ' has not enough data!'; // loop through the image data beginning with the lower left corner while ($y >= 0) { $x = 0; while ($x < $meta['width']) { switch ($meta['bits']) { case 32: case 24: if (!($part = substr($data, $p, 3))) { trigger_error($error, E_USER_WARNING); return $im; } $color = unpack('V', $part . $vide); break; case 16: if (!($part = substr($data, $p, 2))) { trigger_error($error, E_USER_WARNING); return $im; } $color = unpack('v', $part); $color[1] = (($color[1] & 0xf800) >> 8) * 65536 + (($color[1] & 0x07e0) >> 3) * 256 + (($color[1] & 0x001f) << 3); break; case 8: $color = unpack('n', $vide . substr($data, $p, 1)); $color[1] = $palette[ $color[1] + 1 ]; break; case 4: $color = unpack('n', $vide . substr($data, floor($p), 1)); $color[1] = ($p * 2) % 2 == 0 ? $color[1] >> 4 : $color[1] & 0x0F; $color[1] = $palette[ $color[1] + 1 ]; break; case 1: $color = unpack('n', $vide . substr($data, floor($p), 1)); switch (($p * 8) % 8) { case 0: $color[1] = $color[1] >> 7; break; case 1: $color[1] = ($color[1] & 0x40) >> 6; break; case 2: $color[1] = ($color[1] & 0x20) >> 5; break; case 3: $color[1] = ($color[1] & 0x10) >> 4; break; case 4: $color[1] = ($color[1] & 0x8) >> 3; break; case 5: $color[1] = ($color[1] & 0x4) >> 2; break; case 6: $color[1] = ($color[1] & 0x2) >> 1; break; case 7: $color[1] = ($color[1] & 0x1); break; } $color[1] = $palette[ $color[1] + 1 ]; break; default: trigger_error('imagecreatefrombmp: ' . $fileName . ' has ' . $meta['bits'] . ' bits and this is not supported!', E_USER_WARNING); return false; } imagesetpixel($im, $x, $y, $color[1]); $x++; $p += $meta['bytes']; } $y--; $p += $meta['decal']; } fclose($fh); return $im; } /** * @brief Resizes the image preserving ratio. * @param integer $maxSize The maximum size of either the width or height. * @returns bool */ public function resize($maxSize) { if(!$this->valid()) { OC_Log::write('core', __METHOD__.'(): No image loaded', OC_Log::ERROR); return false; } $widthOrig=imageSX($this->resource); $heightOrig=imageSY($this->resource); $ratioOrig = $widthOrig/$heightOrig; if ($ratioOrig > 1) { $newHeight = round($maxSize/$ratioOrig); $newWidth = $maxSize; } else { $newWidth = round($maxSize*$ratioOrig); $newHeight = $maxSize; } $this->preciseResize(round($newWidth), round($newHeight)); return true; } public function preciseResize($width, $height) { if (!$this->valid()) { OC_Log::write('core', __METHOD__.'(): No image loaded', OC_Log::ERROR); return false; } $widthOrig=imageSX($this->resource); $heightOrig=imageSY($this->resource); $process = imagecreatetruecolor($width, $height); if ($process == false) { OC_Log::write('core', __METHOD__.'(): Error creating true color image', OC_Log::ERROR); imagedestroy($process); return false; } // preserve transparency if($this->imageType == IMAGETYPE_GIF or $this->imageType == IMAGETYPE_PNG) { imagecolortransparent($process, imagecolorallocatealpha($process, 0, 0, 0, 127)); imagealphablending($process, false); imagesavealpha($process, true); } imagecopyresampled($process, $this->resource, 0, 0, 0, 0, $width, $height, $widthOrig, $heightOrig); if ($process == false) { OC_Log::write('core', __METHOD__.'(): Error resampling process image '.$width.'x'.$height, OC_Log::ERROR); imagedestroy($process); return false; } imagedestroy($this->resource); $this->resource = $process; return true; } /** * @brief Crops the image to the middle square. If the image is already square it just returns. * @param int maximum size for the result (optional) * @returns bool for success or failure */ public function centerCrop($size=0) { if(!$this->valid()) { OC_Log::write('core', 'OC_Image->centerCrop, No image loaded', OC_Log::ERROR); return false; } $widthOrig=imageSX($this->resource); $heightOrig=imageSY($this->resource); if($widthOrig === $heightOrig and $size==0) { return true; } $ratioOrig = $widthOrig/$heightOrig; $width = $height = min($widthOrig, $heightOrig); if ($ratioOrig > 1) { $x = ($widthOrig/2) - ($width/2); $y = 0; } else { $y = ($heightOrig/2) - ($height/2); $x = 0; } if($size>0) { $targetWidth=$size; $targetHeight=$size; }else{ $targetWidth=$width; $targetHeight=$height; } $process = imagecreatetruecolor($targetWidth, $targetHeight); if ($process == false) { OC_Log::write('core', 'OC_Image->centerCrop. Error creating true color image', OC_Log::ERROR); imagedestroy($process); return false; } // preserve transparency if($this->imageType == IMAGETYPE_GIF or $this->imageType == IMAGETYPE_PNG) { imagecolortransparent($process, imagecolorallocatealpha($process, 0, 0, 0, 127)); imagealphablending($process, false); imagesavealpha($process, true); } imagecopyresampled($process, $this->resource, 0, 0, $x, $y, $targetWidth, $targetHeight, $width, $height); if ($process == false) { OC_Log::write('core', 'OC_Image->centerCrop. Error resampling process image '.$width.'x'.$height, OC_Log::ERROR); imagedestroy($process); return false; } imagedestroy($this->resource); $this->resource = $process; return true; } /** * @brief Crops the image from point $x$y with dimension $wx$h. * @param $x Horizontal position * @param $y Vertical position * @param $w Width * @param $h Height * @returns bool for success or failure */ public function crop($x, $y, $w, $h) { if(!$this->valid()) { OC_Log::write('core', __METHOD__.'(): No image loaded', OC_Log::ERROR); return false; } $process = imagecreatetruecolor($w, $h); if ($process == false) { OC_Log::write('core', __METHOD__.'(): Error creating true color image', OC_Log::ERROR); imagedestroy($process); return false; } imagecopyresampled($process, $this->resource, 0, 0, $x, $y, $w, $h, $w, $h); if ($process == false) { OC_Log::write('core', __METHOD__.'(): Error resampling process image '.$w.'x'.$h, OC_Log::ERROR); imagedestroy($process); return false; } imagedestroy($this->resource); $this->resource = $process; return true; } /** * @brief Resizes the image to fit within a boundry while preserving ratio. * @param integer $maxWidth * @param integer $maxHeight * @returns bool */ public function fitIn($maxWidth, $maxHeight) { if(!$this->valid()) { OC_Log::write('core', __METHOD__.'(): No image loaded', OC_Log::ERROR); return false; } $widthOrig=imageSX($this->resource); $heightOrig=imageSY($this->resource); $ratio = $widthOrig/$heightOrig; $newWidth = min($maxWidth, $ratio*$maxHeight); $newHeight = min($maxHeight, $maxWidth/$ratio); $this->preciseResize(round($newWidth), round($newHeight)); return true; } public function destroy() { if($this->valid()) { imagedestroy($this->resource); } $this->resource=null; } public function __destruct() { $this->destroy(); } } if ( ! function_exists( 'imagebmp') ) { /** * Output a BMP image to either the browser or a file * @link http://www.ugia.cn/wp-data/imagebmp.php * @author legend <legendsky@hotmail.com> * @link http://www.programmierer-forum.de/imagebmp-gute-funktion-gefunden-t143716.htm * @author mgutt <marc@gutt.it> * @version 1.00 * @param string $fileName [optional] The path to save the file to. * @param int $bit [optional] Bit depth, (default is 24). * @param int $compression [optional] * @return bool TRUE on success or FALSE on failure. */ function imagebmp($im, $fileName='', $bit=24, $compression=0) { if (!in_array($bit, array(1, 4, 8, 16, 24, 32))) { $bit = 24; } else if ($bit == 32) { $bit = 24; } $bits = pow(2, $bit); imagetruecolortopalette($im, true, $bits); $width = imagesx($im); $height = imagesy($im); $colorsNum = imagecolorstotal($im); $rgbQuad = ''; if ($bit <= 8) { for ($i = 0; $i < $colorsNum; $i++) { $colors = imagecolorsforindex($im, $i); $rgbQuad .= chr($colors['blue']) . chr($colors['green']) . chr($colors['red']) . "\0"; } $bmpData = ''; if ($compression == 0 || $bit < 8) { $compression = 0; $extra = ''; $padding = 4 - ceil($width / (8 / $bit)) % 4; if ($padding % 4 != 0) { $extra = str_repeat("\0", $padding); } for ($j = $height - 1; $j >= 0; $j --) { $i = 0; while ($i < $width) { $bin = 0; $limit = $width - $i < 8 / $bit ? (8 / $bit - $width + $i) * $bit : 0; for ($k = 8 - $bit; $k >= $limit; $k -= $bit) { $index = imagecolorat($im, $i, $j); $bin |= $index << $k; $i++; } $bmpData .= chr($bin); } $bmpData .= $extra; } } // RLE8 else if ($compression == 1 && $bit == 8) { for ($j = $height - 1; $j >= 0; $j--) { $lastIndex = "\0"; $sameNum = 0; for ($i = 0; $i <= $width; $i++) { $index = imagecolorat($im, $i, $j); if ($index !== $lastIndex || $sameNum > 255) { if ($sameNum != 0) { $bmpData .= chr($same_num) . chr($lastIndex); } $lastIndex = $index; $sameNum = 1; } else { $sameNum++; } } $bmpData .= "\0\0"; } $bmpData .= "\0\1"; } $sizeQuad = strlen($rgbQuad); $sizeData = strlen($bmpData); } else { $extra = ''; $padding = 4 - ($width * ($bit / 8)) % 4; if ($padding % 4 != 0) { $extra = str_repeat("\0", $padding); } $bmpData = ''; for ($j = $height - 1; $j >= 0; $j--) { for ($i = 0; $i < $width; $i++) { $index = imagecolorat($im, $i, $j); $colors = imagecolorsforindex($im, $index); if ($bit == 16) { $bin = 0 << $bit; $bin |= ($colors['red'] >> 3) << 10; $bin |= ($colors['green'] >> 3) << 5; $bin |= $colors['blue'] >> 3; $bmpData .= pack("v", $bin); } else { $bmpData .= pack("c*", $colors['blue'], $colors['green'], $colors['red']); } } $bmpData .= $extra; } $sizeQuad = 0; $sizeData = strlen($bmpData); $colorsNum = 0; } $fileHeader = 'BM' . pack('V3', 54 + $sizeQuad + $sizeData, 0, 54 + $sizeQuad); $infoHeader = pack('V3v2V*', 0x28, $width, $height, 1, $bit, $compression, $sizeData, 0, 0, $colorsNum, 0); if ($fileName != '') { $fp = fopen($fileName, 'wb'); fwrite($fp, $fileHeader . $infoHeader . $rgbQuad . $bmpData); fclose($fp); return true; } echo $fileHeader . $infoHeader. $rgbQuad . $bmpData; return true; } } if ( ! function_exists( 'exif_imagetype' ) ) { /** * Workaround if exif_imagetype does not exist * @link http://www.php.net/manual/en/function.exif-imagetype.php#80383 * @param string $fileName * @return string|boolean */ function exif_imagetype ( $fileName ) { if ( ( $info = getimagesize( $fileName ) ) !== false ) { return $info[2]; } return false; } }


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