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dis-bench / src /php /php-src /ext /bz2 /bz2.c
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/*
+----------------------------------------------------------------------+
| Copyright (c) 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: |
| https://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 |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Sterling Hughes <sterling@php.net> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "php.h"
#include "php_bz2.h"
#include "bz2_arginfo.h"
#ifdef HAVE_BZ2
/* PHP Includes */
#include "ext/standard/info.h"
#include "main/php_network.h"
/* for fileno() */
#include <stdio.h>
/* Internal error constants */
#define PHP_BZ_ERRNO 0
#define PHP_BZ_ERRSTR 1
#define PHP_BZ_ERRBOTH 2
static PHP_MINIT_FUNCTION(bz2);
static PHP_MSHUTDOWN_FUNCTION(bz2);
static PHP_MINFO_FUNCTION(bz2);
zend_module_entry bz2_module_entry = {
STANDARD_MODULE_HEADER,
"bz2",
ext_functions,
PHP_MINIT(bz2),
PHP_MSHUTDOWN(bz2),
NULL,
NULL,
PHP_MINFO(bz2),
PHP_BZ2_VERSION,
STANDARD_MODULE_PROPERTIES
};
#ifdef COMPILE_DL_BZ2
ZEND_GET_MODULE(bz2)
#endif
struct php_bz2_stream_data_t {
BZFILE *bz_file;
php_stream *stream;
};
/* {{{ BZip2 stream implementation */
static ssize_t php_bz2iop_read(php_stream *stream, char *buf, size_t count)
{
struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *)stream->abstract;
size_t ret = 0;
do {
int just_read;
size_t remain = count - ret;
int to_read = (int)(remain <= INT_MAX ? remain : INT_MAX);
just_read = BZ2_bzread(self->bz_file, buf, to_read);
if (just_read < 1) {
/* it is not safe to keep reading after an error, see #72613 */
stream->eof = 1;
if (just_read < 0) {
if (ret) {
return ret;
}
return -1;
}
break;
}
ret += just_read;
} while (ret < count);
return ret;
}
static ssize_t php_bz2iop_write(php_stream *stream, const char *buf, size_t count)
{
size_t wrote = 0;
struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *)stream->abstract;
do {
int just_wrote;
size_t remain = count - wrote;
int to_write = (int)(remain <= INT_MAX ? remain : INT_MAX);
just_wrote = BZ2_bzwrite(self->bz_file, (char*)buf, to_write);
if (just_wrote < 0) {
if (wrote == 0) {
return just_wrote;
}
return wrote;
}
if (just_wrote == 0) {
break;
}
wrote += just_wrote;
} while (wrote < count);
return wrote;
}
static int php_bz2iop_close(php_stream *stream, int close_handle)
{
struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *)stream->abstract;
int ret = EOF;
if (close_handle) {
BZ2_bzclose(self->bz_file);
}
if (self->stream) {
php_stream_free(self->stream, PHP_STREAM_FREE_CLOSE | (close_handle == 0 ? PHP_STREAM_FREE_PRESERVE_HANDLE : 0));
}
efree(self);
return ret;
}
static int php_bz2iop_flush(php_stream *stream)
{
struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *)stream->abstract;
return BZ2_bzflush(self->bz_file);
}
/* }}} */
const php_stream_ops php_stream_bz2io_ops = {
php_bz2iop_write, php_bz2iop_read,
php_bz2iop_close, php_bz2iop_flush,
"BZip2",
NULL, /* seek */
NULL, /* cast */
NULL, /* stat */
NULL /* set_option */
};
/* {{{ Bzip2 stream openers */
PHP_BZ2_API php_stream *_php_stream_bz2open_from_BZFILE(BZFILE *bz,
const char *mode, php_stream *innerstream STREAMS_DC)
{
struct php_bz2_stream_data_t *self;
self = emalloc(sizeof(*self));
self->stream = innerstream;
if (innerstream) {
GC_ADDREF(innerstream->res);
}
self->bz_file = bz;
return php_stream_alloc_rel(&php_stream_bz2io_ops, self, 0, mode);
}
PHP_BZ2_API php_stream *_php_stream_bz2open(php_stream_wrapper *wrapper,
const char *path,
const char *mode,
int options,
zend_string **opened_path,
php_stream_context *context STREAMS_DC)
{
php_stream *retstream = NULL, *stream = NULL;
char *path_copy = NULL;
BZFILE *bz_file = NULL;
if (strncasecmp("compress.bzip2://", path, 17) == 0) {
path += 17;
}
if (mode[0] == '\0' || (mode[0] != 'w' && mode[0] != 'r' && mode[1] != '\0')) {
return NULL;
}
#ifdef VIRTUAL_DIR
virtual_filepath_ex(path, &path_copy, NULL);
#else
path_copy = (char *)path;
#endif
if (php_check_open_basedir(path_copy)) {
#ifdef VIRTUAL_DIR
efree(path_copy);
#endif
return NULL;
}
/* try and open it directly first */
bz_file = BZ2_bzopen(path_copy, mode);
if (opened_path && bz_file) {
*opened_path = zend_string_init(path_copy, strlen(path_copy), 0);
}
#ifdef VIRTUAL_DIR
efree(path_copy);
#endif
if (bz_file == NULL) {
/* that didn't work, so try and get something from the network/wrapper */
stream = php_stream_open_wrapper(path, mode, options | STREAM_WILL_CAST, opened_path);
if (stream) {
php_socket_t fd;
if (SUCCESS == php_stream_cast(stream, PHP_STREAM_AS_FD, (void **) &fd, REPORT_ERRORS)) {
bz_file = BZ2_bzdopen((int)fd, mode);
}
}
/* remove the file created by php_stream_open_wrapper(), it is not needed since BZ2 functions
* failed.
*/
if (opened_path && !bz_file && mode[0] == 'w') {
VCWD_UNLINK(ZSTR_VAL(*opened_path));
}
}
if (bz_file) {
retstream = _php_stream_bz2open_from_BZFILE(bz_file, mode, stream STREAMS_REL_CC);
if (retstream) {
return retstream;
}
BZ2_bzclose(bz_file);
}
if (stream) {
php_stream_close(stream);
}
return NULL;
}
/* }}} */
static const php_stream_wrapper_ops bzip2_stream_wops = {
_php_stream_bz2open,
NULL, /* close */
NULL, /* fstat */
NULL, /* stat */
NULL, /* opendir */
"BZip2",
NULL, /* unlink */
NULL, /* rename */
NULL, /* mkdir */
NULL, /* rmdir */
NULL
};
static const php_stream_wrapper php_stream_bzip2_wrapper = {
&bzip2_stream_wops,
NULL,
0 /* is_url */
};
static void php_bz2_error(INTERNAL_FUNCTION_PARAMETERS, int);
static PHP_MINIT_FUNCTION(bz2)
{
php_register_url_stream_wrapper("compress.bzip2", &php_stream_bzip2_wrapper);
php_stream_filter_register_factory("bzip2.*", &php_bz2_filter_factory);
return SUCCESS;
}
static PHP_MSHUTDOWN_FUNCTION(bz2)
{
php_unregister_url_stream_wrapper("compress.bzip2");
php_stream_filter_unregister_factory("bzip2.*");
return SUCCESS;
}
static PHP_MINFO_FUNCTION(bz2)
{
php_info_print_table_start();
php_info_print_table_row(2, "BZip2 Support", "Enabled");
php_info_print_table_row(2, "Stream Wrapper support", "compress.bzip2://");
php_info_print_table_row(2, "Stream Filter support", "bzip2.decompress, bzip2.compress");
php_info_print_table_row(2, "BZip2 Version", (char *) BZ2_bzlibVersion());
php_info_print_table_end();
}
/* {{{ Reads up to length bytes from a BZip2 stream, or 1024 bytes if length is not specified */
PHP_FUNCTION(bzread)
{
zend_long len = 1024;
php_stream *stream;
zend_string *data;
ZEND_PARSE_PARAMETERS_START(1, 2)
PHP_Z_PARAM_STREAM(stream)
Z_PARAM_OPTIONAL
Z_PARAM_LONG(len)
ZEND_PARSE_PARAMETERS_END();
if (len < 0) {
zend_argument_value_error(2, "must be greater than or equal to 0");
RETURN_THROWS();
}
data = php_stream_read_to_str(stream, len);
if (!data) {
RETURN_FALSE;
}
RETURN_STR(data);
}
/* }}} */
/* {{{ Opens a new BZip2 stream */
PHP_FUNCTION(bzopen)
{
zval *file; /* The file to open */
char *mode; /* The mode to open the stream with */
size_t mode_len;
BZFILE *bz; /* The compressed file stream */
php_stream *stream = NULL;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "zs", &file, &mode, &mode_len) == FAILURE) {
RETURN_THROWS();
}
if (mode_len != 1 || (mode[0] != 'r' && mode[0] != 'w')) {
zend_argument_value_error(2, "must be either \"r\" or \"w\"");
RETURN_THROWS();
}
/* If it's not a resource its a string containing the filename to open */
if (Z_TYPE_P(file) == IS_STRING) {
if (Z_STRLEN_P(file) == 0) {
zend_argument_must_not_be_empty_error(1);
RETURN_THROWS();
}
if (CHECK_ZVAL_NULL_PATH(file)) {
zend_argument_type_error(1, "must not contain null bytes");
RETURN_THROWS();
}
stream = php_stream_bz2open(NULL, Z_STRVAL_P(file), mode, REPORT_ERRORS, NULL);
} else if (Z_TYPE_P(file) == IS_RESOURCE) {
/* If it is a resource, than its a stream resource */
php_socket_t fd;
size_t stream_mode_len;
php_stream_from_zval(stream, file);
stream_mode_len = strlen(stream->mode);
if (stream_mode_len != 1 && !(stream_mode_len == 2 && memchr(stream->mode, 'b', 2))) {
php_error_docref(NULL, E_WARNING, "Cannot use stream opened in mode '%s'", stream->mode);
RETURN_FALSE;
} else if (stream_mode_len == 1 && stream->mode[0] != 'r' && stream->mode[0] != 'w' && stream->mode[0] != 'a' && stream->mode[0] != 'x') {
php_error_docref(NULL, E_WARNING, "Cannot use stream opened in mode '%s'", stream->mode);
RETURN_FALSE;
}
switch(mode[0]) {
case 'r':
/* only "r" and "rb" are supported */
if (stream->mode[0] != mode[0] && !(stream_mode_len == 2 && stream->mode[1] != mode[0])) {
php_error_docref(NULL, E_WARNING, "Cannot read from a stream opened in write only mode");
RETURN_FALSE;
}
break;
case 'w':
/* support only "w"(b), "a"(b), "x"(b) */
if (stream->mode[0] != mode[0] && !(stream_mode_len == 2 && stream->mode[1] != mode[0])
&& stream->mode[0] != 'a' && !(stream_mode_len == 2 && stream->mode[1] != 'a')
&& stream->mode[0] != 'x' && !(stream_mode_len == 2 && stream->mode[1] != 'x')) {
php_error_docref(NULL, E_WARNING, "cannot write to a stream opened in read only mode");
RETURN_FALSE;
}
break;
EMPTY_SWITCH_DEFAULT_CASE();
}
if (FAILURE == php_stream_cast(stream, PHP_STREAM_AS_FD, (void *) &fd, REPORT_ERRORS)) {
RETURN_FALSE;
}
bz = BZ2_bzdopen((int)fd, mode);
stream = php_stream_bz2open_from_BZFILE(bz, mode, stream);
} else {
zend_argument_type_error(1, "must be of type string or file-resource, %s given", zend_zval_value_name(file));
RETURN_THROWS();
}
if (stream) {
php_stream_to_zval(stream, return_value);
} else {
RETURN_FALSE;
}
}
/* }}} */
/* {{{ Returns the error number */
PHP_FUNCTION(bzerrno)
{
php_bz2_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_BZ_ERRNO);
}
/* }}} */
/* {{{ Returns the error string */
PHP_FUNCTION(bzerrstr)
{
php_bz2_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_BZ_ERRSTR);
}
/* }}} */
/* {{{ Returns the error number and error string in an associative array */
PHP_FUNCTION(bzerror)
{
php_bz2_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_BZ_ERRBOTH);
}
/* }}} */
/* {{{ Compresses a string into BZip2 encoded data */
PHP_FUNCTION(bzcompress)
{
char *source; /* Source data to compress */
zend_long zblock_size = 4; /* Block size for compression algorithm */
zend_long zwork_factor = 0; /* Work factor for compression algorithm */
zend_string *dest = NULL; /* Destination to place the compressed data into */
size_t source_len; /* Length of the source data */
unsigned int dest_len; /* Length of the destination buffer */
if (zend_parse_parameters(ZEND_NUM_ARGS(), "s|ll", &source, &source_len, &zblock_size, &zwork_factor) == FAILURE) {
RETURN_THROWS();
}
if (zblock_size < 1 || zblock_size > 9) {
zend_argument_value_error(2, "must be between 1 and 9");
RETURN_THROWS();
}
int block_size = (int) zblock_size;
if (zwork_factor < 0 || zwork_factor > 250) {
zend_argument_value_error(3, "must be between 0 and 250");
RETURN_THROWS();
}
int work_factor = (int) zwork_factor;
/* Assign them to easy to use variables, dest_len is initially the length of the data
+ .01 x length of data + 600 which is the largest size the results of the compression
could possibly be, at least that's what the libbz2 docs say (thanks to jeremy@nirvani.net
for pointing this out). */
// TODO Check source string length fits in unsigned int
dest_len = (unsigned int) (source_len + (0.01 * source_len) + 600);
/* Allocate the destination buffer */
dest = zend_string_alloc(dest_len, 0);
int error = BZ2_bzBuffToBuffCompress(ZSTR_VAL(dest), &dest_len, source, source_len, block_size, 0, work_factor);
if (error != BZ_OK) {
zend_string_efree(dest);
RETURN_LONG(error);
} else {
/* Copy the buffer, we have perhaps allocate a lot more than we need,
so we erealloc() the buffer to the proper size */
ZSTR_LEN(dest) = dest_len;
ZSTR_VAL(dest)[ZSTR_LEN(dest)] = '\0';
RETURN_NEW_STR(dest);
}
}
/* }}} */
/* {{{ Decompresses BZip2 compressed data */
PHP_FUNCTION(bzdecompress)
{
char *source;
zend_string *dest;
size_t source_len;
int error;
bool small = 0;
#ifdef PHP_WIN32
unsigned __int64 size = 0;
#else
unsigned long long size = 0;
#endif
bz_stream bzs;
if (FAILURE == zend_parse_parameters(ZEND_NUM_ARGS(), "s|b", &source, &source_len, &small)) {
RETURN_THROWS();
}
bzs.bzalloc = NULL;
bzs.bzfree = NULL;
if (BZ2_bzDecompressInit(&bzs, 0, (int)small) != BZ_OK) {
RETURN_FALSE;
}
// TODO Check source string length fits in unsigned int
bzs.next_in = source;
bzs.avail_in = source_len;
/* in most cases bz2 offers at least 2:1 compression, so we use that as our base */
dest = zend_string_safe_alloc(source_len, 2, 1, 0);
bzs.avail_out = source_len * 2;
bzs.next_out = ZSTR_VAL(dest);
while ((error = BZ2_bzDecompress(&bzs)) == BZ_OK && bzs.avail_in > 0) {
/* compression is better then 2:1, need to allocate more memory */
bzs.avail_out = source_len;
size = (bzs.total_out_hi32 * (unsigned int) -1) + bzs.total_out_lo32;
#ifndef ZEND_ENABLE_ZVAL_LONG64
if (size > SIZE_MAX) {
/* no reason to continue if we're going to drop it anyway */
break;
}
#endif
dest = zend_string_safe_realloc(dest, 1, bzs.avail_out+1, (size_t) size, 0);
bzs.next_out = ZSTR_VAL(dest) + size;
}
if (error == BZ_STREAM_END || error == BZ_OK) {
size = (bzs.total_out_hi32 * (unsigned int) -1) + bzs.total_out_lo32;
#ifndef ZEND_ENABLE_ZVAL_LONG64
if (UNEXPECTED(size > SIZE_MAX)) {
php_error_docref(NULL, E_WARNING, "Decompressed size too big, max is %zd", SIZE_MAX);
zend_string_efree(dest);
RETVAL_LONG(BZ_MEM_ERROR);
} else
#endif
{
dest = zend_string_safe_realloc(dest, 1, (size_t)size, 1, 0);
ZSTR_LEN(dest) = (size_t)size;
ZSTR_VAL(dest)[(size_t)size] = '\0';
RETVAL_STR(dest);
}
} else { /* real error */
zend_string_efree(dest);
RETVAL_LONG(error);
}
BZ2_bzDecompressEnd(&bzs);
}
/* }}} */
/* {{{ php_bz2_error()
The central error handling interface, does the work for bzerrno, bzerrstr and bzerror */
static void php_bz2_error(INTERNAL_FUNCTION_PARAMETERS, int opt)
{
php_stream *stream;
const char *errstr; /* Error string */
int errnum; /* Error number */
struct php_bz2_stream_data_t *self;
ZEND_PARSE_PARAMETERS_START(1, 1)
PHP_Z_PARAM_STREAM(stream)
ZEND_PARSE_PARAMETERS_END();
if (!php_stream_is(stream, PHP_STREAM_IS_BZIP2)) {
zend_argument_type_error(1, "must be a bz2 stream");
RETURN_THROWS();
}
self = (struct php_bz2_stream_data_t *) stream->abstract;
/* Fetch the error information */
errstr = BZ2_bzerror(self->bz_file, &errnum);
/* Determine what to return */
switch (opt) {
case PHP_BZ_ERRNO:
RETURN_LONG(errnum);
break;
case PHP_BZ_ERRSTR:
RETURN_STRING((char*)errstr);
break;
case PHP_BZ_ERRBOTH:
array_init(return_value);
add_assoc_long (return_value, "errno", errnum);
add_assoc_string(return_value, "errstr", (char*)errstr);
break;
}
}
/* }}} */
#endif