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<?php
namespace Safe;
use Safe\Exceptions\ZlibException;
/**
* Incrementally deflates data in the specified context.
*
* @param resource $context A context created with deflate_init.
* @param string $data A chunk of data to compress.
* @param int $flush_mode One of ZLIB_BLOCK,
* ZLIB_NO_FLUSH,
* ZLIB_PARTIAL_FLUSH,
* ZLIB_SYNC_FLUSH (default),
* ZLIB_FULL_FLUSH, ZLIB_FINISH.
* Normally you will want to set ZLIB_NO_FLUSH to
* maximize compression, and ZLIB_FINISH to terminate
* with the last chunk of data. See the zlib manual for a
* detailed description of these constants.
* @return string Returns a chunk of compressed data.
* @throws ZlibException
*
*/
function deflate_add($context, string $data, int $flush_mode = ZLIB_SYNC_FLUSH): string
{
error_clear_last();
$result = \deflate_add($context, $data, $flush_mode);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Initializes an incremental deflate context using the specified
* encoding.
*
* Note that the window option here only sets the window size
* of the algorithm, differently from the zlib filters where the same parameter
* also sets the encoding to use; the encoding must be set with the
* encoding parameter.
*
* Limitation: there is currently no way to set the header information on a GZIP
* compressed stream, which are set as follows: GZIP signature
* (\x1f\x8B); compression method (\x08
* == DEFLATE); 6 zero bytes; the operating system set to the current system
* (\x00 = Windows, \x03 = Unix, etc.)
*
* @param int $encoding One of the ZLIB_ENCODING_* constants.
* @param array $options An associative array which may contain the following elements:
*
*
* level
*
*
* The compression level in range -1..9; defaults to -1.
*
*
*
*
* memory
*
*
* The compression memory level in range 1..9; defaults to 8.
*
*
*
*
* window
*
*
* The zlib window size (logarithmic) in range 8..15; defaults to 15.
*
*
*
*
* strategy
*
*
* One of ZLIB_FILTERED,
* ZLIB_HUFFMAN_ONLY, ZLIB_RLE,
* ZLIB_FIXED or
* ZLIB_DEFAULT_STRATEGY (the default).
*
*
*
*
* dictionary
*
*
* A string or an array of strings
* of the preset dictionary (default: no preset dictionary).
*
*
*
*
*
* The compression level in range -1..9; defaults to -1.
*
* The compression memory level in range 1..9; defaults to 8.
*
* The zlib window size (logarithmic) in range 8..15; defaults to 15.
*
* One of ZLIB_FILTERED,
* ZLIB_HUFFMAN_ONLY, ZLIB_RLE,
* ZLIB_FIXED or
* ZLIB_DEFAULT_STRATEGY (the default).
*
* A string or an array of strings
* of the preset dictionary (default: no preset dictionary).
* @return resource Returns a deflate context resource (zlib.deflate) on
* success.
* @throws ZlibException
*
*/
function deflate_init(int $encoding, array $options = null)
{
error_clear_last();
$result = \deflate_init($encoding, $options);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Closes the given gz-file pointer.
*
* @param resource $zp The gz-file pointer. It must be valid, and must point to a file
* successfully opened by gzopen.
* @throws ZlibException
*
*/
function gzclose($zp): void
{
error_clear_last();
$result = \gzclose($zp);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
}
/**
* This function compresses the given string using the ZLIB
* data format.
*
* For details on the ZLIB compression algorithm see the document
* "ZLIB Compressed Data Format
* Specification version 3.3" (RFC 1950).
*
* @param string $data The data to compress.
* @param int $level The level of compression. Can be given as 0 for no compression up to 9
* for maximum compression.
*
* If -1 is used, the default compression of the zlib library is used which is 6.
* @param int $encoding One of ZLIB_ENCODING_* constants.
* @return string The compressed string.
* @throws ZlibException
*
*/
function gzcompress(string $data, int $level = -1, int $encoding = ZLIB_ENCODING_DEFLATE): string
{
error_clear_last();
$result = \gzcompress($data, $level, $encoding);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* This function returns a decoded version of the input
* data.
*
* @param string $data The data to decode, encoded by gzencode.
* @param int $length The maximum length of data to decode.
* @return string The decoded string.
* @throws ZlibException
*
*/
function gzdecode(string $data, int $length = null): string
{
error_clear_last();
if ($length !== null) {
$result = \gzdecode($data, $length);
} else {
$result = \gzdecode($data);
}
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* This function compresses the given string using the DEFLATE
* data format.
*
* For details on the DEFLATE compression algorithm see the document
* "DEFLATE Compressed Data Format
* Specification version 1.3" (RFC 1951).
*
* @param string $data The data to deflate.
* @param int $level The level of compression. Can be given as 0 for no compression up to 9
* for maximum compression. If not given, the default compression level will
* be the default compression level of the zlib library.
* @param int $encoding One of ZLIB_ENCODING_* constants.
* @return string The deflated string.
* @throws ZlibException
*
*/
function gzdeflate(string $data, int $level = -1, int $encoding = ZLIB_ENCODING_RAW): string
{
error_clear_last();
$result = \gzdeflate($data, $level, $encoding);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* This function returns a compressed version of the input
* data compatible with the output of the
* gzip program.
*
* For more information on the GZIP file format, see the document:
* GZIP file format specification
* version 4.3 (RFC 1952).
*
* @param string $data The data to encode.
* @param int $level The level of compression. Can be given as 0 for no compression up to 9
* for maximum compression. If not given, the default compression level will
* be the default compression level of the zlib library.
* @param int $encoding_mode The encoding mode. Can be FORCE_GZIP (the default)
* or FORCE_DEFLATE.
*
* Prior to PHP 5.4.0, using FORCE_DEFLATE results in
* a standard zlib deflated string (inclusive zlib headers) after a gzip
* file header but without the trailing crc32 checksum.
*
* In PHP 5.4.0 and later, FORCE_DEFLATE generates
* RFC 1950 compliant output, consisting of a zlib header, the deflated
* data, and an Adler checksum.
* @return string The encoded string.
* @throws ZlibException
*
*/
function gzencode(string $data, int $level = -1, int $encoding_mode = FORCE_GZIP): string
{
error_clear_last();
$result = \gzencode($data, $level, $encoding_mode);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Gets a (uncompressed) string of up to length - 1 bytes read from the given
* file pointer. Reading ends when length - 1 bytes have been read, on a
* newline, or on EOF (whichever comes first).
*
* @param resource $zp The gz-file pointer. It must be valid, and must point to a file
* successfully opened by gzopen.
* @param int $length The length of data to get.
* @return string The uncompressed string.
* @throws ZlibException
*
*/
function gzgets($zp, int $length = null): string
{
error_clear_last();
if ($length !== null) {
$result = \gzgets($zp, $length);
} else {
$result = \gzgets($zp);
}
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Identical to gzgets, except that
* gzgetss attempts to strip any HTML and PHP
* tags from the text it reads.
*
* @param resource $zp The gz-file pointer. It must be valid, and must point to a file
* successfully opened by gzopen.
* @param int $length The length of data to get.
* @param string $allowable_tags You can use this optional parameter to specify tags which should not
* be stripped.
* @return string The uncompressed and stripped string.
* @throws ZlibException
*
*/
function gzgetss($zp, int $length, string $allowable_tags = null): string
{
error_clear_last();
if ($allowable_tags !== null) {
$result = \gzgetss($zp, $length, $allowable_tags);
} else {
$result = \gzgetss($zp, $length);
}
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* This function inflates a deflated string.
*
* @param string $data The data compressed by gzdeflate.
* @param int $length The maximum length of data to decode.
* @return string The original uncompressed data.
*
* The function will return an error if the uncompressed data is more than
* 32768 times the length of the compressed input data
* or more than the optional parameter length.
* @throws ZlibException
*
*/
function gzinflate(string $data, int $length = 0): string
{
error_clear_last();
$result = \gzinflate($data, $length);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Reads to EOF on the given gz-file pointer from the current position and
* writes the (uncompressed) results to standard output.
*
* @param resource $zp The gz-file pointer. It must be valid, and must point to a file
* successfully opened by gzopen.
* @return int The number of uncompressed characters read from gz
* and passed through to the input.
* @throws ZlibException
*
*/
function gzpassthru($zp): int
{
error_clear_last();
$result = \gzpassthru($zp);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Sets the file position indicator of the given gz-file pointer to the
* beginning of the file stream.
*
* @param resource $zp The gz-file pointer. It must be valid, and must point to a file
* successfully opened by gzopen.
* @throws ZlibException
*
*/
function gzrewind($zp): void
{
error_clear_last();
$result = \gzrewind($zp);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
}
/**
* This function uncompress a compressed string.
*
* @param string $data The data compressed by gzcompress.
* @param int $length The maximum length of data to decode.
* @return string The original uncompressed data.
*
* The function will return an error if the uncompressed data is more than
* 32768 times the length of the compressed input data
* or more than the optional parameter length.
* @throws ZlibException
*
*/
function gzuncompress(string $data, int $length = 0): string
{
error_clear_last();
$result = \gzuncompress($data, $length);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
*
*
* @param resource $resource
* @return int Returns number of bytes read so far.
* @throws ZlibException
*
*/
function inflate_get_read_len($resource): int
{
error_clear_last();
$result = \inflate_get_read_len($resource);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Usually returns either ZLIB_OK or ZLIB_STREAM_END.
*
* @param resource $resource
* @return int Returns decompression status.
* @throws ZlibException
*
*/
function inflate_get_status($resource): int
{
error_clear_last();
$result = \inflate_get_status($resource);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Incrementally inflates encoded data in the specified context.
*
* Limitation: header information from GZIP compressed data are not made
* available.
*
* @param resource $context A context created with inflate_init.
* @param string $encoded_data A chunk of compressed data.
* @param int $flush_mode One of ZLIB_BLOCK,
* ZLIB_NO_FLUSH,
* ZLIB_PARTIAL_FLUSH,
* ZLIB_SYNC_FLUSH (default),
* ZLIB_FULL_FLUSH, ZLIB_FINISH.
* Normally you will want to set ZLIB_NO_FLUSH to
* maximize compression, and ZLIB_FINISH to terminate
* with the last chunk of data. See the zlib manual for a
* detailed description of these constants.
* @return string Returns a chunk of uncompressed data.
* @throws ZlibException
*
*/
function inflate_add($context, string $encoded_data, int $flush_mode = ZLIB_SYNC_FLUSH): string
{
error_clear_last();
$result = \inflate_add($context, $encoded_data, $flush_mode);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Initialize an incremental inflate context with the specified
* encoding.
*
* @param int $encoding One of the ZLIB_ENCODING_* constants.
* @param array $options An associative array which may contain the following elements:
*
*
* level
*
*
* The compression level in range -1..9; defaults to -1.
*
*
*
*
* memory
*
*
* The compression memory level in range 1..9; defaults to 8.
*
*
*
*
* window
*
*
* The zlib window size (logarithmic) in range 8..15; defaults to 15.
*
*
*
*
* strategy
*
*
* One of ZLIB_FILTERED,
* ZLIB_HUFFMAN_ONLY, ZLIB_RLE,
* ZLIB_FIXED or
* ZLIB_DEFAULT_STRATEGY (the default).
*
*
*
*
* dictionary
*
*
* A string or an array of strings
* of the preset dictionary (default: no preset dictionary).
*
*
*
*
*
* The compression level in range -1..9; defaults to -1.
*
* The compression memory level in range 1..9; defaults to 8.
*
* The zlib window size (logarithmic) in range 8..15; defaults to 15.
*
* One of ZLIB_FILTERED,
* ZLIB_HUFFMAN_ONLY, ZLIB_RLE,
* ZLIB_FIXED or
* ZLIB_DEFAULT_STRATEGY (the default).
*
* A string or an array of strings
* of the preset dictionary (default: no preset dictionary).
* @return resource Returns an inflate context resource (zlib.inflate) on
* success.
* @throws ZlibException
*
*/
function inflate_init(int $encoding, array $options = null)
{
error_clear_last();
$result = \inflate_init($encoding, $options);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Reads a file, decompresses it and writes it to standard output.
*
* readgzfile can be used to read a file which is not in
* gzip format; in this case readgzfile will directly
* read from the file without decompression.
*
* @param string $filename The file name. This file will be opened from the filesystem and its
* contents written to standard output.
* @param int $use_include_path You can set this optional parameter to 1, if you
* want to search for the file in the include_path too.
* @return int Returns the number of (uncompressed) bytes read from the file on success
* @throws ZlibException
*
*/
function readgzfile(string $filename, int $use_include_path = 0): int
{
error_clear_last();
$result = \readgzfile($filename, $use_include_path);
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}
/**
* Uncompress any raw/gzip/zlib encoded data.
*
* @param string $data
* @param int $max_decoded_len
* @return string Returns the uncompressed data.
* @throws ZlibException
*
*/
function zlib_decode(string $data, int $max_decoded_len = null): string
{
error_clear_last();
if ($max_decoded_len !== null) {
$result = \zlib_decode($data, $max_decoded_len);
} else {
$result = \zlib_decode($data);
}
if ($result === false) {
throw ZlibException::createFromPhpError();
}
return $result;
}