/**
* Calculate the DiffMatchPatch patch between two Phabricator files.
*
* @phutil-external-symbol class diff_match_patch
*/
public static function calculatePatch(PhabricatorFile $old = null, PhabricatorFile $new = null)
{
$root = dirname(phutil_get_library_root('phabricator'));
require_once $root . '/externals/diff_match_patch/diff_match_patch.php';
$old_hash = self::EMPTY_HASH;
$new_hash = self::EMPTY_HASH;
if ($old !== null) {
$old_hash = $old->getContentHash();
}
if ($new !== null) {
$new_hash = $new->getContentHash();
}
$old_content = '';
$new_content = '';
if ($old_hash === $new_hash) {
return null;
}
if ($old_hash !== self::EMPTY_HASH) {
$old_content = $old->loadFileData();
} else {
$old_content = '';
}
if ($new_hash !== self::EMPTY_HASH) {
$new_content = $new->loadFileData();
} else {
$new_content = '';
}
$dmp = new diff_match_patch();
$dmp_patches = $dmp->patch_make($old_content, $new_content);
return $dmp->patch_toText($dmp_patches);
}
/**
* Very crudely scale an image up or down to an exact size.
*/
private function crudelyScaleTo(PhabricatorFile $file, $dx, $dy)
{
$data = $file->loadFileData();
$src = imagecreatefromstring($data);
$dst = $this->applyScaleTo($src, $dx, $dy);
return $this->saveImageDataInAnyFormat($dst, $file->getMimeType());
}
private function applyMemeToFile(PhabricatorFile $file, $upper_text, $lower_text)
{
$data = $file->loadFileData();
$img_type = $file->getMimeType();
$imagemagick = PhabricatorEnv::getEnvConfig('files.enable-imagemagick');
if ($img_type != 'image/gif' || $imagemagick == false) {
return $this->applyMemeTo($data, $upper_text, $lower_text, $img_type);
}
$data = $file->loadFileData();
$input = new TempFile();
Filesystem::writeFile($input, $data);
list($out) = execx('convert %s info:', $input);
$split = phutil_split_lines($out);
if (count($split) > 1) {
return $this->applyMemeWithImagemagick($input, $upper_text, $lower_text, count($split), $img_type);
} else {
return $this->applyMemeTo($data, $upper_text, $lower_text, $img_type);
}
}
private function buildSourceCodeView(PhabricatorPaste $paste, PhabricatorFile $file)
{
$language = $paste->getLanguage();
$source = $file->loadFileData();
if (empty($language)) {
$source = PhabricatorSyntaxHighlighter::highlightWithFilename($paste->getTitle(), $source);
} else {
$source = PhabricatorSyntaxHighlighter::highlightWithLanguage($language, $source);
}
$lines = explode("\n", $source);
return id(new PhabricatorSourceCodeView())->setLines($lines);
}
private function generatePreview(PhabricatorFile $file, $size)
{
$data = $file->loadFileData();
$src = imagecreatefromstring($data);
$x = imagesx($src);
$y = imagesy($src);
$scale = min($size / $x, $size / $y, 1);
$dx = max($size / 4, $scale * $x);
$dy = max($size / 4, $scale * $y);
$dst = imagecreatetruecolor($dx, $dy);
imagesavealpha($dst, true);
imagefill($dst, 0, 0, imagecolorallocatealpha($dst, 255, 255, 255, 127));
$sdx = $scale * $x;
$sdy = $scale * $y;
imagecopyresampled($dst, $src, ($dx - $sdx) / 2, ($dy - $sdy) / 2, 0, 0, $sdx, $sdy, $x, $y);
return $this->saveImageDataInAnyFormat($dst, $file->getMimeType());
}
public function getFileDataIterator(PhabricatorFile $file, $begin, $end)
{
// The default implementation is trivial and just loads the entire file
// upfront.
$data = $file->loadFileData();
if ($begin !== null && $end !== null) {
$data = substr($data, $begin, $end - $begin);
} else {
if ($begin !== null) {
$data = substr($data, $begin);
} else {
if ($end !== null) {
$data = substr($data, 0, $end);
}
}
}
return array($data);
}
private function applyScaleWithImagemagick(PhabricatorFile $file, $dx, $dy)
{
$img_type = $file->getMimeType();
$imagemagick = PhabricatorEnv::getEnvConfig('files.enable-imagemagick');
if ($img_type != 'image/gif' || $imagemagick == false) {
return null;
}
$data = $file->loadFileData();
$src = imagecreatefromstring($data);
$x = imagesx($src);
$y = imagesy($src);
if (self::isEnormousGIF($x, $y)) {
return null;
}
$scale = min($dx / $x, $dy / $y, 1);
$sdx = $scale * $x;
$sdy = $scale * $y;
$input = new TempFile();
Filesystem::writeFile($input, $data);
$resized = new TempFile();
$future = new ExecFuture('convert %s -coalesce -resize %sX%s%s %s', $input, $sdx, $sdy, '!', $resized);
// Don't spend more than 10 seconds resizing; just fail if it takes longer
// than that.
$future->setTimeout(10)->resolvex();
return Filesystem::readFile($resized);
}
public function executeProfileTransform(PhabricatorFile $file, $x, $min_y, $max_y)
{
$data = $file->loadFileData();
$image = $this->crudelyCropTo($data, $x, $min_y, $max_y);
return PhabricatorFile::newFromFileData($image, array('name' => 'profile-' . $file->getName()));
}
