/* Constants */
+ /** @var string Strip marker for comments. **/
+ const PLACEHOLDER = "\x7fPLACEHOLDER\x7f";
+
/**
- * Maximum file size to still qualify for in-line embedding as a data-URI
- *
- * 24,576 is used because Internet Explorer has a 32,768 byte limit for data URIs,
- * which when base64 encoded will result in a 1/3 increase in size.
+ * Internet Explorer data URI length limit. See encodeImageAsDataURI().
*/
- const EMBED_SIZE_LIMIT = 24576;
const DATA_URI_SIZE_LIMIT = 32768;
const URL_REGEX = 'url\(\s*[\'"]?(?P<file>[^\?\)\'"]*?)(?P<query>\?[^\)\'"]*?|)[\'"]?\s*\)';
const EMBED_REGEX = '\/\*\s*\@embed\s*\*\/';
* @param string $file Image file to encode.
* @param string|null $type File's MIME type or null. If null, CSSMin will
* try to autodetect the type.
- * @param int|bool $sizeLimit If the size of the target file is greater than
- * this value, decline to encode the image file and return false
- * instead. If $sizeLimit is false, no limit is enforced.
+ * @param bool $ie8Compat By default, a data URI will only be produced if it can be made short
+ * enough to fit in Internet Explorer 8 (and earlier) URI length limit (32,768 bytes). Pass
+ * `false` to remove this limitation.
* @return string|bool Image contents encoded as a data URI or false.
*/
- public static function encodeImageAsDataURI( $file, $type = null,
- $sizeLimit = self::EMBED_SIZE_LIMIT
- ) {
- if ( $sizeLimit !== false && filesize( $file ) >= $sizeLimit ) {
+ public static function encodeImageAsDataURI( $file, $type = null, $ie8Compat = true ) {
+ // Fast-fail for files that definitely exceed the maximum data URI length
+ if ( $ie8Compat && filesize( $file ) >= self::DATA_URI_SIZE_LIMIT ) {
return false;
}
+
if ( $type === null ) {
$type = self::getMimeType( $file );
}
return false;
}
- $contents = file_get_contents( $file );
- // Only whitespace and printable ASCII characters
- $isText = (bool)preg_match( '/^[\r\n\t\x20-\x7e]+$/', $contents );
+ return self::encodeStringAsDataURI( file_get_contents( $file ), $type, $ie8Compat );
+ }
- if ( $isText ) {
- // Do not base64-encode non-binary files (sane SVGs), unless that'd exceed URI length limit.
+ /**
+ * Encode file contents as a data URI with chosen MIME type.
+ *
+ * The URI will be base64-encoded for binary files or just percent-encoded otherwise.
+ *
+ * @since 1.25
+ *
+ * @param string $contents File contents to encode.
+ * @param string $type File's MIME type.
+ * @param bool $ie8Compat See encodeImageAsDataURI().
+ * @return string|bool Image contents encoded as a data URI or false.
+ */
+ public static function encodeStringAsDataURI( $contents, $type, $ie8Compat = true ) {
+ // Try #1: Non-encoded data URI
+ // The regular expression matches ASCII whitespace and printable characters.
+ if ( preg_match( '/^[\r\n\t\x20-\x7e]+$/', $contents ) ) {
+ // Do not base64-encode non-binary files (sane SVGs).
// (This often produces longer URLs, but they compress better, yielding a net smaller size.)
$uri = 'data:' . $type . ',' . rawurlencode( $contents );
- if ( strlen( $uri ) >= self::DATA_URI_SIZE_LIMIT ) {
- $uri = 'data:' . $type . ';base64,' . base64_encode( $contents );
+ if ( !$ie8Compat || strlen( $uri ) < self::DATA_URI_SIZE_LIMIT ) {
+ return $uri;
}
- } else {
- $uri = 'data:' . $type . ';base64,' . base64_encode( $contents );
}
- return $uri;
+ // Try #2: Encoded data URI
+ $uri = 'data:' . $type . ';base64,' . base64_encode( $contents );
+ if ( !$ie8Compat || strlen( $uri ) < self::DATA_URI_SIZE_LIMIT ) {
+ return $uri;
+ }
+
+ // A data URI couldn't be produced
+ return false;
}
/**
$remote = substr( $remote, 0, -1 );
}
+ // Disallow U+007F DELETE, which is illegal anyway, and which
+ // we use for comment placeholders.
+ $source = str_replace( "\x7f", "?", $source );
+
// Replace all comments by a placeholder so they will not interfere with the remapping.
// Warning: This will also catch on anything looking like the start of a comment between
// quotation marks (e.g. "foo /* bar").
$comments = array();
- $placeholder = uniqid( '', true );
$pattern = '/(?!' . CSSMin::EMBED_REGEX . ')(' . CSSMin::COMMENT_REGEX . ')/s';
$source = preg_replace_callback(
$pattern,
- function ( $match ) use ( &$comments, $placeholder ) {
+ function ( $match ) use ( &$comments ) {
$comments[] = $match[ 0 ];
- return $placeholder . ( count( $comments ) - 1 ) . 'x';
+ return CSSMin::PLACEHOLDER . ( count( $comments ) - 1 ) . 'x';
},
$source
);
$source = preg_replace_callback(
$pattern,
- function ( $matchOuter ) use ( $local, $remote, $embedData, $placeholder ) {
+ function ( $matchOuter ) use ( $local, $remote, $embedData ) {
$rule = $matchOuter[0];
// Check for global @embed comment and remove it. Allow other comments to be present
// before @embed (they have been replaced with placeholders at this point).
$embedAll = false;
- $rule = preg_replace( '/^((?:\s+|' . $placeholder . '(\d+)x)*)' . CSSMin::EMBED_REGEX . '\s*/', '$1', $rule, 1, $embedAll );
+ $rule = preg_replace( '/^((?:\s+|' . CSSMin::PLACEHOLDER . '(\d+)x)*)' . CSSMin::EMBED_REGEX . '\s*/', '$1', $rule, 1, $embedAll );
// Build two versions of current rule: with remapped URLs
// and with embedded data: URIs (where possible).
}, $source );
// Re-insert comments
- $pattern = '/' . $placeholder . '(\d+)x/';
+ $pattern = '/' . CSSMin::PLACEHOLDER . '(\d+)x/';
$source = preg_replace_callback( $pattern, function( $match ) use ( &$comments ) {
return $comments[ $match[1] ];
}, $source );
* @return bool
*/
public static function isLocalUrl( $maybeUrl ) {
- if ( !self::isRemoteUrl( $maybeUrl ) && $maybeUrl !== '' && $maybeUrl[0] === '/' ) {
+ if ( $maybeUrl !== '' && $maybeUrl[0] === '/' && !self::isRemoteUrl( $maybeUrl ) ) {
return true;
}
return false;
dépôts / lhc / web / wiklou.git / blobdiff