mirror of
https://github.com/mrclay/minify.git
synced 2025-08-11 08:34:19 +02:00
HTTP_Encoder now tests decompression and allows compressed content to be within 100 bytes of target size.
This commit is contained in:
@@ -72,9 +72,9 @@ function test_HTTP_Encoder()
|
||||
$variedLength = strlen($variedContent);
|
||||
|
||||
$encodingTests = array(
|
||||
array('method' => 'deflate', 'exp' => 32157)
|
||||
,array('method' => 'gzip', 'exp' => 32175)
|
||||
,array('method' => 'compress', 'exp' => 32211)
|
||||
array('method' => 'deflate', 'inv' => 'gzinflate', 'exp' => 32157)
|
||||
,array('method' => 'gzip', 'inv' => '_gzdecode', 'exp' => 32175)
|
||||
,array('method' => 'compress', 'inv' => 'gzuncompress', 'exp' => 32211)
|
||||
);
|
||||
|
||||
foreach ($encodingTests as $test) {
|
||||
@@ -84,17 +84,141 @@ function test_HTTP_Encoder()
|
||||
));
|
||||
$e->encode(9);
|
||||
$ret = strlen($e->getContent());
|
||||
|
||||
$desc = "HTTP_Encoder : {$test['method']} -> "
|
||||
. sprintf('%d(%4.2f%%)', $ret, $ret/$variedLength*100);
|
||||
|
||||
$passed = assertTrue($ret == $test['exp'], $desc);
|
||||
// test uncompression
|
||||
$roundTrip = @call_user_func($test['inv'], $e->getContent());
|
||||
$desc = "HTTP_Encoder : {$test['method']} : uncompress possible";
|
||||
$passed = assertTrue($variedContent == $roundTrip, $desc);
|
||||
|
||||
// test expected compressed size
|
||||
$desc = "HTTP_Encoder : {$test['method']} : compressed to "
|
||||
. sprintf('%4.2f%% of original', $ret/$variedLength*100);
|
||||
$passed = assertTrue(abs($ret - $test['exp']) < 100, $desc);
|
||||
if (__FILE__ === realpath($_SERVER['SCRIPT_FILENAME'])) {
|
||||
echo "\n--- {$test['method']}: expected bytes: "
|
||||
, "{$test['exp']}. Returned: {$ret}\n\n";
|
||||
, "{$test['exp']}. Returned: {$ret} "
|
||||
, "(off by ". abs($ret - $test['exp']) . " bytes)\n\n";
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
test_HTTP_Encoder();
|
||||
test_HTTP_Encoder();
|
||||
|
||||
function _gzdecode($data)
|
||||
{
|
||||
$filename = $error = '';
|
||||
return _phpman_gzdecode($data, $filename, $error);
|
||||
}
|
||||
|
||||
// http://www.php.net/manual/en/function.gzdecode.php#82930
|
||||
function _phpman_gzdecode($data, &$filename='', &$error='', $maxlength=null)
|
||||
{
|
||||
$len = strlen($data);
|
||||
if ($len < 18 || strcmp(substr($data,0,2),"\x1f\x8b")) {
|
||||
$error = "Not in GZIP format.";
|
||||
return null; // Not GZIP format (See RFC 1952)
|
||||
}
|
||||
$method = ord(substr($data,2,1)); // Compression method
|
||||
$flags = ord(substr($data,3,1)); // Flags
|
||||
if ($flags & 31 != $flags) {
|
||||
$error = "Reserved bits not allowed.";
|
||||
return null;
|
||||
}
|
||||
// NOTE: $mtime may be negative (PHP integer limitations)
|
||||
$mtime = unpack("V", substr($data,4,4));
|
||||
$mtime = $mtime[1];
|
||||
$xfl = substr($data,8,1);
|
||||
$os = substr($data,8,1);
|
||||
$headerlen = 10;
|
||||
$extralen = 0;
|
||||
$extra = "";
|
||||
if ($flags & 4) {
|
||||
// 2-byte length prefixed EXTRA data in header
|
||||
if ($len - $headerlen - 2 < 8) {
|
||||
return false; // invalid
|
||||
}
|
||||
$extralen = unpack("v",substr($data,8,2));
|
||||
$extralen = $extralen[1];
|
||||
if ($len - $headerlen - 2 - $extralen < 8) {
|
||||
return false; // invalid
|
||||
}
|
||||
$extra = substr($data,10,$extralen);
|
||||
$headerlen += 2 + $extralen;
|
||||
}
|
||||
$filenamelen = 0;
|
||||
$filename = "";
|
||||
if ($flags & 8) {
|
||||
// C-style string
|
||||
if ($len - $headerlen - 1 < 8) {
|
||||
return false; // invalid
|
||||
}
|
||||
$filenamelen = strpos(substr($data,$headerlen),chr(0));
|
||||
if ($filenamelen === false || $len - $headerlen - $filenamelen - 1 < 8) {
|
||||
return false; // invalid
|
||||
}
|
||||
$filename = substr($data,$headerlen,$filenamelen);
|
||||
$headerlen += $filenamelen + 1;
|
||||
}
|
||||
$commentlen = 0;
|
||||
$comment = "";
|
||||
if ($flags & 16) {
|
||||
// C-style string COMMENT data in header
|
||||
if ($len - $headerlen - 1 < 8) {
|
||||
return false; // invalid
|
||||
}
|
||||
$commentlen = strpos(substr($data,$headerlen),chr(0));
|
||||
if ($commentlen === false || $len - $headerlen - $commentlen - 1 < 8) {
|
||||
return false; // Invalid header format
|
||||
}
|
||||
$comment = substr($data,$headerlen,$commentlen);
|
||||
$headerlen += $commentlen + 1;
|
||||
}
|
||||
$headercrc = "";
|
||||
if ($flags & 2) {
|
||||
// 2-bytes (lowest order) of CRC32 on header present
|
||||
if ($len - $headerlen - 2 < 8) {
|
||||
return false; // invalid
|
||||
}
|
||||
$calccrc = crc32(substr($data,0,$headerlen)) & 0xffff;
|
||||
$headercrc = unpack("v", substr($data,$headerlen,2));
|
||||
$headercrc = $headercrc[1];
|
||||
if ($headercrc != $calccrc) {
|
||||
$error = "Header checksum failed.";
|
||||
return false; // Bad header CRC
|
||||
}
|
||||
$headerlen += 2;
|
||||
}
|
||||
// GZIP FOOTER
|
||||
$datacrc = unpack("V",substr($data,-8,4));
|
||||
$datacrc = sprintf('%u',$datacrc[1] & 0xFFFFFFFF);
|
||||
$isize = unpack("V",substr($data,-4));
|
||||
$isize = $isize[1];
|
||||
// decompression:
|
||||
$bodylen = $len-$headerlen-8;
|
||||
if ($bodylen < 1) {
|
||||
// IMPLEMENTATION BUG!
|
||||
return null;
|
||||
}
|
||||
$body = substr($data,$headerlen,$bodylen);
|
||||
$data = "";
|
||||
if ($bodylen > 0) {
|
||||
switch ($method) {
|
||||
case 8:
|
||||
// Currently the only supported compression method:
|
||||
$data = gzinflate($body,$maxlength);
|
||||
break;
|
||||
default:
|
||||
$error = "Unknown compression method.";
|
||||
return false;
|
||||
}
|
||||
} // zero-byte body content is allowed
|
||||
// Verifiy CRC32
|
||||
$crc = sprintf("%u",crc32($data));
|
||||
$crcOK = $crc == $datacrc;
|
||||
$lenOK = $isize == strlen($data);
|
||||
if (!$lenOK || !$crcOK) {
|
||||
$error = ( $lenOK ? '' : 'Length check FAILED. ') . ( $crcOK ? '' : 'Checksum FAILED.');
|
||||
return false;
|
||||
}
|
||||
return $data;
|
||||
}
|
Reference in New Issue
Block a user