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zlib.c
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/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2016 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Rasmus Lerdorf <[email protected]> |
| Stefan Röhrich <[email protected]> |
| Zeev Suraski <[email protected]> |
| Jade Nicoletti <[email protected]> |
| Michael Wallner <[email protected]> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#include "SAPI.h"
#include "php_ini.h"
#include "ext/standard/info.h"
#include "ext/standard/file.h"
#include "ext/standard/php_string.h"
#include "php_zlib.h"
/*
* zlib include files can define the following preprocessor defines which rename
* the corresponding PHP functions to gzopen64, gzseek64 and gztell64 and thereby
* breaking some software, most notably PEAR's Archive_Tar, which halts execution
* without error message on gzip compressed archivesa.
*
* This only seems to happen on 32bit systems with large file support.
*/
#undef gzopen
#undef gzseek
#undef gztell
int le_deflate;
int le_inflate;
ZEND_DECLARE_MODULE_GLOBALS(zlib);
/* {{{ Memory management wrappers */
static voidpf php_zlib_alloc(voidpf opaque, uInt items, uInt size)
{
return (voidpf)safe_emalloc(items, size, 0);
}
static void php_zlib_free(voidpf opaque, voidpf address)
{
efree((void*)address);
}
/* }}} */
/* {{{ Incremental deflate/inflate resource destructors */
void deflate_rsrc_dtor(zend_resource *res)
{
z_stream *ctx = zend_fetch_resource(res, NULL, le_deflate);
deflateEnd(ctx);
efree(ctx);
}
void inflate_rsrc_dtor(zend_resource *res)
{
z_stream *ctx = zend_fetch_resource(res, NULL, le_inflate);
if (((php_zlib_context *) ctx)->inflateDict) {
efree(((php_zlib_context *) ctx)->inflateDict);
}
inflateEnd(ctx);
efree(ctx);
}
/* }}} */
/* {{{ php_zlib_output_conflict_check() */
static int php_zlib_output_conflict_check(const char *handler_name, size_t handler_name_len)
{
if (php_output_get_level() > 0) {
if (php_output_handler_conflict(handler_name, handler_name_len, ZEND_STRL(PHP_ZLIB_OUTPUT_HANDLER_NAME))
|| php_output_handler_conflict(handler_name, handler_name_len, ZEND_STRL("ob_gzhandler"))
|| php_output_handler_conflict(handler_name, handler_name_len, ZEND_STRL("mb_output_handler"))
|| php_output_handler_conflict(handler_name, handler_name_len, ZEND_STRL("URL-Rewriter"))) {
return FAILURE;
}
}
return SUCCESS;
}
/* }}} */
/* {{{ php_zlib_output_encoding() */
static int php_zlib_output_encoding(void)
{
zval *enc;
if (!ZLIBG(compression_coding)) {
if ((Z_TYPE(PG(http_globals)[TRACK_VARS_SERVER]) == IS_ARRAY || zend_is_auto_global_str(ZEND_STRL("_SERVER"))) &&
(enc = zend_hash_str_find(Z_ARRVAL(PG(http_globals)[TRACK_VARS_SERVER]), "HTTP_ACCEPT_ENCODING", sizeof("HTTP_ACCEPT_ENCODING") - 1))) {
convert_to_string(enc);
if (strstr(Z_STRVAL_P(enc), "gzip")) {
ZLIBG(compression_coding) = PHP_ZLIB_ENCODING_GZIP;
} else if (strstr(Z_STRVAL_P(enc), "deflate")) {
ZLIBG(compression_coding) = PHP_ZLIB_ENCODING_DEFLATE;
}
}
}
return ZLIBG(compression_coding);
}
/* }}} */
/* {{{ php_zlib_output_handler_ex() */
static int php_zlib_output_handler_ex(php_zlib_context *ctx, php_output_context *output_context)
{
int flags = Z_SYNC_FLUSH;
if (output_context->op & PHP_OUTPUT_HANDLER_START) {
/* start up */
if (Z_OK != deflateInit2(&ctx->Z, ZLIBG(output_compression_level), Z_DEFLATED, ZLIBG(compression_coding), MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY)) {
return FAILURE;
}
}
if (output_context->op & PHP_OUTPUT_HANDLER_CLEAN) {
/* free buffers */
deflateEnd(&ctx->Z);
if (output_context->op & PHP_OUTPUT_HANDLER_FINAL) {
/* discard */
return SUCCESS;
} else {
/* restart */
if (Z_OK != deflateInit2(&ctx->Z, ZLIBG(output_compression_level), Z_DEFLATED, ZLIBG(compression_coding), MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY)) {
return FAILURE;
}
ctx->buffer.used = 0;
}
} else {
if (output_context->in.used) {
/* append input */
if (ctx->buffer.free < output_context->in.used) {
if (!(ctx->buffer.aptr = erealloc_recoverable(ctx->buffer.data, ctx->buffer.used + ctx->buffer.free + output_context->in.used))) {
deflateEnd(&ctx->Z);
return FAILURE;
}
ctx->buffer.data = ctx->buffer.aptr;
ctx->buffer.free += output_context->in.used;
}
memcpy(ctx->buffer.data + ctx->buffer.used, output_context->in.data, output_context->in.used);
ctx->buffer.free -= output_context->in.used;
ctx->buffer.used += output_context->in.used;
}
output_context->out.size = PHP_ZLIB_BUFFER_SIZE_GUESS(output_context->in.used);
output_context->out.data = emalloc(output_context->out.size);
output_context->out.free = 1;
output_context->out.used = 0;
ctx->Z.avail_in = ctx->buffer.used;
ctx->Z.next_in = (Bytef *) ctx->buffer.data;
ctx->Z.avail_out = output_context->out.size;
ctx->Z.next_out = (Bytef *) output_context->out.data;
if (output_context->op & PHP_OUTPUT_HANDLER_FINAL) {
flags = Z_FINISH;
} else if (output_context->op & PHP_OUTPUT_HANDLER_FLUSH) {
flags = Z_FULL_FLUSH;
}
switch (deflate(&ctx->Z, flags)) {
case Z_OK:
if (flags == Z_FINISH) {
deflateEnd(&ctx->Z);
return FAILURE;
}
case Z_STREAM_END:
if (ctx->Z.avail_in) {
memmove(ctx->buffer.data, ctx->buffer.data + ctx->buffer.used - ctx->Z.avail_in, ctx->Z.avail_in);
}
ctx->buffer.free += ctx->buffer.used - ctx->Z.avail_in;
ctx->buffer.used = ctx->Z.avail_in;
output_context->out.used = output_context->out.size - ctx->Z.avail_out;
break;
default:
deflateEnd(&ctx->Z);
return FAILURE;
}
if (output_context->op & PHP_OUTPUT_HANDLER_FINAL) {
deflateEnd(&ctx->Z);
}
}
return SUCCESS;
}
/* }}} */
/* {{{ php_zlib_output_handler() */
static int php_zlib_output_handler(void **handler_context, php_output_context *output_context)
{
php_zlib_context *ctx = *(php_zlib_context **) handler_context;
if (!php_zlib_output_encoding()) {
/* "Vary: Accept-Encoding" header sent along uncompressed content breaks caching in MSIE,
so let's just send it with successfully compressed content or unless the complete
buffer gets discarded, see http://bugs.php.net/40325;
Test as follows:
+Vary: $ HTTP_ACCEPT_ENCODING=gzip ./sapi/cgi/php <<<'<?php ob_start("ob_gzhandler"); echo "foo\n";'
+Vary: $ HTTP_ACCEPT_ENCODING= ./sapi/cgi/php <<<'<?php ob_start("ob_gzhandler"); echo "foo\n";'
-Vary: $ HTTP_ACCEPT_ENCODING=gzip ./sapi/cgi/php <<<'<?php ob_start("ob_gzhandler"); echo "foo\n"; ob_end_clean();'
-Vary: $ HTTP_ACCEPT_ENCODING= ./sapi/cgi/php <<<'<?php ob_start("ob_gzhandler"); echo "foo\n"; ob_end_clean();'
*/
if ((output_context->op & PHP_OUTPUT_HANDLER_START)
&& (output_context->op != (PHP_OUTPUT_HANDLER_START|PHP_OUTPUT_HANDLER_CLEAN|PHP_OUTPUT_HANDLER_FINAL))
) {
sapi_add_header_ex(ZEND_STRL("Vary: Accept-Encoding"), 1, 0);
}
return FAILURE;
}
if (SUCCESS != php_zlib_output_handler_ex(ctx, output_context)) {
return FAILURE;
}
if (!(output_context->op & PHP_OUTPUT_HANDLER_CLEAN)) {
int flags;
if (SUCCESS == php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_GET_FLAGS, &flags)) {
/* only run this once */
if (!(flags & PHP_OUTPUT_HANDLER_STARTED)) {
if (SG(headers_sent) || !ZLIBG(output_compression)) {
deflateEnd(&ctx->Z);
return FAILURE;
}
switch (ZLIBG(compression_coding)) {
case PHP_ZLIB_ENCODING_GZIP:
sapi_add_header_ex(ZEND_STRL("Content-Encoding: gzip"), 1, 1);
break;
case PHP_ZLIB_ENCODING_DEFLATE:
sapi_add_header_ex(ZEND_STRL("Content-Encoding: deflate"), 1, 1);
break;
default:
deflateEnd(&ctx->Z);
return FAILURE;
}
sapi_add_header_ex(ZEND_STRL("Vary: Accept-Encoding"), 1, 0);
php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE, NULL);
}
}
}
return SUCCESS;
}
/* }}} */
/* {{{ php_zlib_output_handler_context_init() */
static php_zlib_context *php_zlib_output_handler_context_init(void)
{
php_zlib_context *ctx = (php_zlib_context *) ecalloc(1, sizeof(php_zlib_context));
ctx->Z.zalloc = php_zlib_alloc;
ctx->Z.zfree = php_zlib_free;
return ctx;
}
/* }}} */
/* {{{ php_zlib_output_handler_context_dtor() */
static void php_zlib_output_handler_context_dtor(void *opaq)
{
php_zlib_context *ctx = (php_zlib_context *) opaq;
if (ctx) {
if (ctx->buffer.data) {
efree(ctx->buffer.data);
}
efree(ctx);
}
}
/* }}} */
/* {{{ php_zlib_output_handler_init() */
static php_output_handler *php_zlib_output_handler_init(const char *handler_name, size_t handler_name_len, size_t chunk_size, int flags)
{
php_output_handler *h = NULL;
if (!ZLIBG(output_compression)) {
ZLIBG(output_compression) = chunk_size ? chunk_size : PHP_OUTPUT_HANDLER_DEFAULT_SIZE;
}
ZLIBG(handler_registered) = 1;
if ((h = php_output_handler_create_internal(handler_name, handler_name_len, php_zlib_output_handler, chunk_size, flags))) {
php_output_handler_set_context(h, php_zlib_output_handler_context_init(), php_zlib_output_handler_context_dtor);
}
return h;
}
/* }}} */
/* {{{ php_zlib_output_compression_start() */
static void php_zlib_output_compression_start(void)
{
zval zoh;
php_output_handler *h;
switch (ZLIBG(output_compression)) {
case 0:
break;
case 1:
ZLIBG(output_compression) = PHP_OUTPUT_HANDLER_DEFAULT_SIZE;
/* break omitted intentionally */
default:
if ( php_zlib_output_encoding() &&
(h = php_zlib_output_handler_init(ZEND_STRL(PHP_ZLIB_OUTPUT_HANDLER_NAME), ZLIBG(output_compression), PHP_OUTPUT_HANDLER_STDFLAGS)) &&
(SUCCESS == php_output_handler_start(h))) {
if (ZLIBG(output_handler) && *ZLIBG(output_handler)) {
ZVAL_STRING(&zoh, ZLIBG(output_handler));
php_output_start_user(&zoh, ZLIBG(output_compression), PHP_OUTPUT_HANDLER_STDFLAGS);
zval_ptr_dtor(&zoh);
}
}
break;
}
}
/* }}} */
/* {{{ php_zlib_encode() */
static zend_string *php_zlib_encode(const char *in_buf, size_t in_len, int encoding, int level)
{
int status;
z_stream Z;
zend_string *out;
memset(&Z, 0, sizeof(z_stream));
Z.zalloc = php_zlib_alloc;
Z.zfree = php_zlib_free;
if (Z_OK == (status = deflateInit2(&Z, level, Z_DEFLATED, encoding, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY))) {
out = zend_string_alloc(PHP_ZLIB_BUFFER_SIZE_GUESS(in_len), 0);
Z.next_in = (Bytef *) in_buf;
Z.next_out = (Bytef *) ZSTR_VAL(out);
Z.avail_in = in_len;
Z.avail_out = ZSTR_LEN(out);
status = deflate(&Z, Z_FINISH);
deflateEnd(&Z);
if (Z_STREAM_END == status) {
/* size buffer down to actual length */
out = zend_string_truncate(out, Z.total_out, 0);
ZSTR_VAL(out)[ZSTR_LEN(out)] = '\0';
return out;
} else {
zend_string_free(out);
}
}
php_error_docref(NULL, E_WARNING, "%s", zError(status));
return NULL;
}
/* }}} */
/* {{{ php_zlib_inflate_rounds() */
static inline int php_zlib_inflate_rounds(z_stream *Z, size_t max, char **buf, size_t *len)
{
int status, round = 0;
php_zlib_buffer buffer = {NULL, NULL, 0, 0, 0};
*buf = NULL;
*len = 0;
buffer.size = (max && (max < Z->avail_in)) ? max : Z->avail_in;
do {
if ((max && (max <= buffer.used)) || !(buffer.aptr = erealloc_recoverable(buffer.data, buffer.size))) {
status = Z_MEM_ERROR;
} else {
buffer.data = buffer.aptr;
Z->avail_out = buffer.free = buffer.size - buffer.used;
Z->next_out = (Bytef *) buffer.data + buffer.used;
#if 0
fprintf(stderr, "\n%3d: %3d PRIOR: size=%7lu,\tfree=%7lu,\tused=%7lu,\tavail_in=%7lu,\tavail_out=%7lu\n", round, status, buffer.size, buffer.free, buffer.used, Z->avail_in, Z->avail_out);
#endif
status = inflate(Z, Z_NO_FLUSH);
buffer.used += buffer.free - Z->avail_out;
buffer.free = Z->avail_out;
#if 0
fprintf(stderr, "%3d: %3d AFTER: size=%7lu,\tfree=%7lu,\tused=%7lu,\tavail_in=%7lu,\tavail_out=%7lu\n", round, status, buffer.size, buffer.free, buffer.used, Z->avail_in, Z->avail_out);
#endif
buffer.size += (buffer.size >> 3) + 1;
}
} while ((Z_BUF_ERROR == status || (Z_OK == status && Z->avail_in)) && ++round < 100);
if (status == Z_STREAM_END) {
buffer.data = erealloc(buffer.data, buffer.used + 1);
buffer.data[buffer.used] = '\0';
*buf = buffer.data;
*len = buffer.used;
} else {
if (buffer.data) {
efree(buffer.data);
}
/* HACK: See zlib/examples/zpipe.c inf() function for explanation. */
/* This works as long as this function is not used for streaming. Required to catch very short invalid data. */
status = (status == Z_OK) ? Z_DATA_ERROR : status;
}
return status;
}
/* }}} */
/* {{{ php_zlib_decode() */
static int php_zlib_decode(const char *in_buf, size_t in_len, char **out_buf, size_t *out_len, int encoding, size_t max_len)
{
int status = Z_DATA_ERROR;
z_stream Z;
memset(&Z, 0, sizeof(z_stream));
Z.zalloc = php_zlib_alloc;
Z.zfree = php_zlib_free;
if (in_len) {
retry_raw_inflate:
status = inflateInit2(&Z, encoding);
if (Z_OK == status) {
Z.next_in = (Bytef *) in_buf;
Z.avail_in = in_len + 1; /* NOTE: data must be zero terminated */
switch (status = php_zlib_inflate_rounds(&Z, max_len, out_buf, out_len)) {
case Z_STREAM_END:
inflateEnd(&Z);
return SUCCESS;
case Z_DATA_ERROR:
/* raw deflated data? */
if (PHP_ZLIB_ENCODING_ANY == encoding) {
inflateEnd(&Z);
encoding = PHP_ZLIB_ENCODING_RAW;
goto retry_raw_inflate;
}
}
inflateEnd(&Z);
}
}
*out_buf = NULL;
*out_len = 0;
php_error_docref(NULL, E_WARNING, "%s", zError(status));
return FAILURE;
}
/* }}} */
/* {{{ php_zlib_cleanup_ob_gzhandler_mess() */
static void php_zlib_cleanup_ob_gzhandler_mess(void)
{
if (ZLIBG(ob_gzhandler)) {
deflateEnd(&(ZLIBG(ob_gzhandler)->Z));
php_zlib_output_handler_context_dtor(ZLIBG(ob_gzhandler));
ZLIBG(ob_gzhandler) = NULL;
}
}
/* }}} */
/* {{{ proto string ob_gzhandler(string data, int flags)
Legacy hack */
static PHP_FUNCTION(ob_gzhandler)
{
char *in_str;
size_t in_len;
zend_long flags = 0;
php_output_context ctx = {0};
int encoding, rv;
/*
* NOTE that the real ob_gzhandler is an alias to "zlib output compression".
* This is a really bad hack, because
* - we have to initialize a php_zlib_context on demand
* - we have to clean it up in RSHUTDOWN
* - OG(running) is not set or set to any other output handler
* - we have to mess around with php_output_context */
if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS(), "sl", &in_str, &in_len, &flags)) {
RETURN_FALSE;
}
if (!(encoding = php_zlib_output_encoding())) {
RETURN_FALSE;
}
if (flags & PHP_OUTPUT_HANDLER_START) {
switch (encoding) {
case PHP_ZLIB_ENCODING_GZIP:
sapi_add_header_ex(ZEND_STRL("Content-Encoding: gzip"), 1, 1);
break;
case PHP_ZLIB_ENCODING_DEFLATE:
sapi_add_header_ex(ZEND_STRL("Content-Encoding: deflate"), 1, 1);
break;
}
sapi_add_header_ex(ZEND_STRL("Vary: Accept-Encoding"), 1, 0);
}
if (!ZLIBG(ob_gzhandler)) {
ZLIBG(ob_gzhandler) = php_zlib_output_handler_context_init();
}
ctx.op = flags;
ctx.in.data = in_str;
ctx.in.used = in_len;
rv = php_zlib_output_handler_ex(ZLIBG(ob_gzhandler), &ctx);
if (SUCCESS != rv) {
if (ctx.out.data && ctx.out.free) {
efree(ctx.out.data);
}
php_zlib_cleanup_ob_gzhandler_mess();
RETURN_FALSE;
}
if (ctx.out.data) {
RETVAL_STRINGL(ctx.out.data, ctx.out.used);
if (ctx.out.free) {
efree(ctx.out.data);
}
} else {
RETVAL_EMPTY_STRING();
}
}
/* }}} */
/* {{{ proto string zlib_get_coding_type(void)
Returns the coding type used for output compression */
static PHP_FUNCTION(zlib_get_coding_type)
{
if (zend_parse_parameters_none() == FAILURE) {
return;
}
switch (ZLIBG(compression_coding)) {
case PHP_ZLIB_ENCODING_GZIP:
RETURN_STRINGL("gzip", sizeof("gzip") - 1);
case PHP_ZLIB_ENCODING_DEFLATE:
RETURN_STRINGL("deflate", sizeof("deflate") - 1);
default:
RETURN_FALSE;
}
}
/* }}} */
/* {{{ proto array gzfile(string filename [, int use_include_path])
Read and uncompress entire .gz-file into an array */
static PHP_FUNCTION(gzfile)
{
char *filename;
size_t filename_len;
int flags = REPORT_ERRORS;
char buf[8192] = {0};
register int i = 0;
zend_long use_include_path = 0;
php_stream *stream;
if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS(), "p|l", &filename, &filename_len, &use_include_path)) {
return;
}
if (use_include_path) {
flags |= USE_PATH;
}
/* using a stream here is a bit more efficient (resource wise) than php_gzopen_wrapper */
stream = php_stream_gzopen(NULL, filename, "rb", flags, NULL, NULL STREAMS_CC);
if (!stream) {
/* Error reporting is already done by stream code */
RETURN_FALSE;
}
/* Initialize return array */
array_init(return_value);
/* Now loop through the file and do the magic quotes thing if needed */
memset(buf, 0, sizeof(buf));
while (php_stream_gets(stream, buf, sizeof(buf) - 1) != NULL) {
add_index_string(return_value, i++, buf);
}
php_stream_close(stream);
}
/* }}} */
/* {{{ proto resource gzopen(string filename, string mode [, int use_include_path])
Open a .gz-file and return a .gz-file pointer */
static PHP_FUNCTION(gzopen)
{
char *filename;
char *mode;
size_t filename_len, mode_len;
int flags = REPORT_ERRORS;
php_stream *stream;
zend_long use_include_path = 0;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "ps|l", &filename, &filename_len, &mode, &mode_len, &use_include_path) == FAILURE) {
return;
}
if (use_include_path) {
flags |= USE_PATH;
}
stream = php_stream_gzopen(NULL, filename, mode, flags, NULL, NULL STREAMS_CC);
if (!stream) {
RETURN_FALSE;
}
php_stream_to_zval(stream, return_value);
}
/* }}} */
/* {{{ proto int readgzfile(string filename [, int use_include_path])
Output a .gz-file */
static PHP_FUNCTION(readgzfile)
{
char *filename;
size_t filename_len;
int flags = REPORT_ERRORS;
php_stream *stream;
size_t size;
zend_long use_include_path = 0;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "p|l", &filename, &filename_len, &use_include_path) == FAILURE) {
return;
}
if (use_include_path) {
flags |= USE_PATH;
}
stream = php_stream_gzopen(NULL, filename, "rb", flags, NULL, NULL STREAMS_CC);
if (!stream) {
RETURN_FALSE;
}
size = php_stream_passthru(stream);
php_stream_close(stream);
RETURN_LONG(size);
}
/* }}} */
#define PHP_ZLIB_ENCODE_FUNC(name, default_encoding) \
static PHP_FUNCTION(name) \
{ \
zend_string *in, *out; \
zend_long level = -1; \
zend_long encoding = default_encoding; \
if (default_encoding) { \
if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS(), "S|ll", &in, &level, &encoding)) { \
return; \
} \
} else { \
if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS(), "Sl|l", &in, &encoding, &level)) { \
return; \
} \
} \
if (level < -1 || level > 9) { \
php_error_docref(NULL, E_WARNING, "compression level (" ZEND_LONG_FMT ") must be within -1..9", level); \
RETURN_FALSE; \
} \
switch (encoding) { \
case PHP_ZLIB_ENCODING_RAW: \
case PHP_ZLIB_ENCODING_GZIP: \
case PHP_ZLIB_ENCODING_DEFLATE: \
break; \
default: \
php_error_docref(NULL, E_WARNING, "encoding mode must be either ZLIB_ENCODING_RAW, ZLIB_ENCODING_GZIP or ZLIB_ENCODING_DEFLATE"); \
RETURN_FALSE; \
} \
if ((out = php_zlib_encode(ZSTR_VAL(in), ZSTR_LEN(in), encoding, level)) == NULL) { \
RETURN_FALSE; \
} \
RETURN_STR(out); \
}
#define PHP_ZLIB_DECODE_FUNC(name, encoding) \
static PHP_FUNCTION(name) \
{ \
char *in_buf, *out_buf; \
size_t in_len; \
size_t out_len; \
zend_long max_len = 0; \
if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS(), "s|l", &in_buf, &in_len, &max_len)) { \
return; \
} \
if (max_len < 0) { \
php_error_docref(NULL, E_WARNING, "length (" ZEND_LONG_FMT ") must be greater or equal zero", max_len); \
RETURN_FALSE; \
} \
if (SUCCESS != php_zlib_decode(in_buf, in_len, &out_buf, &out_len, encoding, max_len)) { \
RETURN_FALSE; \
} \
RETVAL_STRINGL(out_buf, out_len); \
efree(out_buf); \
}
/* {{{ proto binary zlib_encode(binary data, int encoding[, int level = -1])
Compress data with the specified encoding */
PHP_ZLIB_ENCODE_FUNC(zlib_encode, 0);
/* }}} */
/* {{{ proto binary zlib_decode(binary data[, int max_decoded_len])
Uncompress any raw/gzip/zlib encoded data */
PHP_ZLIB_DECODE_FUNC(zlib_decode, PHP_ZLIB_ENCODING_ANY);
/* }}} */
/* NOTE: The naming of these userland functions was quite unlucky */
/* {{{ proto binary gzdeflate(binary data[, int level = -1[, int encoding = ZLIB_ENCODING_RAW])
Encode data with the raw deflate encoding */
PHP_ZLIB_ENCODE_FUNC(gzdeflate, PHP_ZLIB_ENCODING_RAW);
/* }}} */
/* {{{ proto binary gzencode(binary data[, int level = -1[, int encoding = ZLIB_ENCODING_GZIP])
Encode data with the gzip encoding */
PHP_ZLIB_ENCODE_FUNC(gzencode, PHP_ZLIB_ENCODING_GZIP);
/* }}} */
/* {{{ proto binary gzcompress(binary data[, int level = -1[, int encoding = ZLIB_ENCODING_DEFLATE])
Encode data with the zlib encoding */
PHP_ZLIB_ENCODE_FUNC(gzcompress, PHP_ZLIB_ENCODING_DEFLATE);
/* }}} */
/* {{{ proto binary gzinflate(binary data[, int max_decoded_len])
Decode raw deflate encoded data */
PHP_ZLIB_DECODE_FUNC(gzinflate, PHP_ZLIB_ENCODING_RAW);
/* }}} */
/* {{{ proto binary gzdecode(binary data[, int max_decoded_len])
Decode gzip encoded data */
PHP_ZLIB_DECODE_FUNC(gzdecode, PHP_ZLIB_ENCODING_GZIP);
/* }}} */
/* {{{ proto binary gzuncompress(binary data[, int max_decoded_len])
Decode zlib encoded data */
PHP_ZLIB_DECODE_FUNC(gzuncompress, PHP_ZLIB_ENCODING_DEFLATE);
/* }}} */
static zend_bool zlib_create_dictionary_string(HashTable *options, char **dict, size_t *dictlen) {
zval *option_buffer;
if (options && (option_buffer = zend_hash_str_find(options, ZEND_STRL("dictionary"))) != NULL) {
ZVAL_DEREF(option_buffer);
switch (Z_TYPE_P(option_buffer)) {
case IS_STRING: {
zend_string *str = Z_STR_P(option_buffer);
size_t i;
zend_bool last_null = 1;
for (i = 0; i < ZSTR_LEN(str); i++) {
if (ZSTR_VAL(str)[i]) {
last_null = 0;
} else {
if (last_null) {
php_error_docref(NULL, E_WARNING, "dictionary string must not contain empty entries (two consecutive NULL-bytes or one at the very beginning)");
return 0;
}
last_null = 1;
}
}
if (!last_null) {
php_error_docref(NULL, E_WARNING, "dictionary string must be NULL-byte terminated (each dictionary entry has to be NULL-terminated)");
}
*dict = emalloc(ZSTR_LEN(str));
memcpy(*dict, ZSTR_VAL(str), ZSTR_LEN(str));
*dictlen = ZSTR_LEN(str);
} break;
case IS_ARRAY: {
HashTable *dictionary = Z_ARR_P(option_buffer);
if (zend_hash_num_elements(dictionary) > 0) {
char *dictptr;
zval *cur;
zend_string **strings = emalloc(sizeof(zend_string *) * zend_hash_num_elements(dictionary));
zend_string **end, **ptr = strings - 1;
ZEND_HASH_FOREACH_VAL(dictionary, cur) {
size_t i;
*++ptr = zval_get_string(cur);
if (!*ptr || ZSTR_LEN(*ptr) == 0) {
if (*ptr) {
efree(*ptr);
}
while (--ptr >= strings) {
efree(ptr);
}
efree(strings);
php_error_docref(NULL, E_WARNING, "dictionary entries must be non-empty strings");
return 0;
}
for (i = 0; i < ZSTR_LEN(*ptr); i++) {
if (ZSTR_VAL(*ptr)[i] == 0) {
do {
efree(ptr);
} while (--ptr >= strings);
efree(strings);
php_error_docref(NULL, E_WARNING, "dictionary entries must not contain a NULL-byte");
return 0;
}
}
*dictlen += ZSTR_LEN(*ptr) + 1;
} ZEND_HASH_FOREACH_END();
dictptr = *dict = emalloc(*dictlen);
ptr = strings;
end = strings + zend_hash_num_elements(dictionary);
do {
memcpy(dictptr, ZSTR_VAL(*ptr), ZSTR_LEN(*ptr));
dictptr += ZSTR_LEN(*ptr);
*dictptr++ = 0;
zend_string_release(*ptr);
} while (++ptr != end);
efree(strings);
}
} break;
default:
php_error_docref(NULL, E_WARNING, "dictionary must be of type zero-terminated string or array, got %s", zend_get_type_by_const(Z_TYPE_P(option_buffer)));
return 0;
}
}
return 1;
}
/* {{{ proto resource inflate_init(int encoding)
Initialize an incremental inflate context with the specified encoding */
PHP_FUNCTION(inflate_init)
{
z_stream *ctx;
zend_long encoding, window = 15;
char *dict = NULL;
size_t dictlen = 0;
HashTable *options = NULL;
zval *option_buffer;
if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS(), "l|H", &encoding, &options)) {
return;
}
if (options && (option_buffer = zend_hash_str_find(options, ZEND_STRL("window"))) != NULL) {
window = zval_get_long(option_buffer);
}
if (window < 8 || window > 15) {
php_error_docref(NULL, E_WARNING, "zlib window size (lograithm) (" ZEND_LONG_FMT ") must be within 8..15", window);
RETURN_FALSE;
}
if (!zlib_create_dictionary_string(options, &dict, &dictlen)) {
RETURN_FALSE;
}
switch (encoding) {
case PHP_ZLIB_ENCODING_RAW:
case PHP_ZLIB_ENCODING_GZIP:
case PHP_ZLIB_ENCODING_DEFLATE:
break;
default:
php_error_docref(NULL, E_WARNING, "encoding mode must be ZLIB_ENCODING_RAW, ZLIB_ENCODING_GZIP or ZLIB_ENCODING_DEFLATE");
RETURN_FALSE;
}
ctx = ecalloc(1, sizeof(php_zlib_context));
ctx->zalloc = php_zlib_alloc;
ctx->zfree = php_zlib_free;
((php_zlib_context *) ctx)->inflateDict = dict;
((php_zlib_context *) ctx)->inflateDictlen = dictlen;
if (encoding < 0) {
encoding += 15 - window;
} else {
encoding -= 15 - window;
}
if (Z_OK == inflateInit2(ctx, encoding)) {
RETURN_RES(zend_register_resource(ctx, le_inflate));
} else {
efree(ctx);
php_error_docref(NULL, E_WARNING, "failed allocating zlib.inflate context");
RETURN_FALSE;
}
}
/* }}} */
/* {{{ proto string inflate_add(resource context, string encoded_data[, int flush_mode = ZLIB_SYNC_FLUSH])
Incrementally inflate encoded data in the specified context */
PHP_FUNCTION(inflate_add)
{
zend_string *out;
char *in_buf;
size_t in_len, buffer_used = 0, CHUNK_SIZE = 8192;
zval *res;
z_stream *ctx;
zend_long flush_type = Z_SYNC_FLUSH;
int status;
if (SUCCESS != zend_parse_parameters(ZEND_NUM_ARGS(), "rs|l", &res, &in_buf, &in_len, &flush_type)) {
return;
}
if (!(ctx = zend_fetch_resource_ex(res, NULL, le_inflate))) {
php_error_docref(NULL, E_WARNING, "Invalid zlib.inflate resource");
RETURN_FALSE;
}
switch (flush_type) {
case Z_NO_FLUSH:
case Z_PARTIAL_FLUSH:
case Z_SYNC_FLUSH:
case Z_FULL_FLUSH:
case Z_BLOCK:
case Z_FINISH:
break;
default:
php_error_docref(NULL, E_WARNING,
"flush mode must be ZLIB_NO_FLUSH, ZLIB_PARTIAL_FLUSH, ZLIB_SYNC_FLUSH, ZLIB_FULL_FLUSH, ZLIB_BLOCK or ZLIB_FINISH");
RETURN_FALSE;
}
if (in_len <= 0 && flush_type != Z_FINISH) {
RETURN_EMPTY_STRING();
}
out = zend_string_alloc((in_len > CHUNK_SIZE) ? in_len : CHUNK_SIZE, 0);
ctx->next_in = (Bytef *) in_buf;
ctx->next_out = (Bytef *) ZSTR_VAL(out);
ctx->avail_in = in_len;
ctx->avail_out = ZSTR_LEN(out);
do {
status = inflate(ctx, flush_type);
buffer_used = ZSTR_LEN(out) - ctx->avail_out;
switch (status) {
case Z_OK:
if (ctx->avail_out == 0) {
/* more output buffer space needed; realloc and try again */
out = zend_string_realloc(out, ZSTR_LEN(out) + CHUNK_SIZE, 0);
ctx->avail_out = CHUNK_SIZE;
ctx->next_out = (Bytef *) ZSTR_VAL(out) + buffer_used;
break;
} else {
goto complete;
}
case Z_STREAM_END:
inflateReset(ctx);
goto complete;
case Z_BUF_ERROR:
if (flush_type == Z_FINISH && ctx->avail_out == 0) {
/* more output buffer space needed; realloc and try again */
out = zend_string_realloc(out, ZSTR_LEN(out) + CHUNK_SIZE, 0);
ctx->avail_out = CHUNK_SIZE;
ctx->next_out = (Bytef *) ZSTR_VAL(out) + buffer_used;
break;
} else {
/* No more input data; we're finished */
goto complete;
}
case Z_NEED_DICT:
if (((php_zlib_context *) ctx)->inflateDict) {
php_zlib_context *php_ctx = (php_zlib_context *) ctx;
switch (inflateSetDictionary(ctx, (Bytef *) php_ctx->inflateDict, php_ctx->inflateDictlen)) {
case Z_OK:
efree(php_ctx->inflateDict);
php_ctx->inflateDict = NULL;
break;
case Z_DATA_ERROR:
php_error_docref(NULL, E_WARNING, "dictionary does not match expected dictionary (incorrect adler32 hash)");
efree(php_ctx->inflateDict);
zend_string_release(out);
php_ctx->inflateDict = NULL;
RETURN_FALSE;
EMPTY_SWITCH_DEFAULT_CASE()
}
break;
} else {
php_error_docref(NULL, E_WARNING, "inflating this data requires a preset dictionary, please specify it in the options array of inflate_init()");
RETURN_FALSE;