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LCOV - code coverage report
Current view: top level - ext/bz2 - bz2.c (source / functions) Hit Total Coverage
Test: PHP Code Coverage Lines: 0 201 0.0 %
Date: 2014-04-16 Functions: 0 17 0.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /*
       2             :   +----------------------------------------------------------------------+
       3             :   | PHP Version 5                                                        |
       4             :   +----------------------------------------------------------------------+
       5             :   | Copyright (c) 1997-2014 The PHP Group                                |
       6             :   +----------------------------------------------------------------------+
       7             :   | This source file is subject to version 3.01 of the PHP license,      |
       8             :   | that is bundled with this package in the file LICENSE, and is        |
       9             :   | available through the world-wide-web at the following url:           |
      10             :   | http://www.php.net/license/3_01.txt                                  |
      11             :   | If you did not receive a copy of the PHP license and are unable to   |
      12             :   | obtain it through the world-wide-web, please send a note to          |
      13             :   | license@php.net so we can mail you a copy immediately.               |
      14             :   +----------------------------------------------------------------------+
      15             :   | Author: Sterling Hughes <sterling@php.net>                           |
      16             :   +----------------------------------------------------------------------+
      17             : */
      18             :  
      19             : /* $Id$ */
      20             : 
      21             : #ifdef HAVE_CONFIG_H
      22             : #include "config.h"
      23             : #endif
      24             : 
      25             : #include "php.h"
      26             : #include "php_bz2.h"
      27             : 
      28             : #if HAVE_BZ2
      29             : 
      30             : /* PHP Includes */
      31             : #include "ext/standard/file.h"
      32             : #include "ext/standard/info.h"
      33             : #include "ext/standard/php_string.h"
      34             : #include "main/php_network.h"
      35             : 
      36             : /* for fileno() */
      37             : #include <stdio.h>
      38             : 
      39             : /* Internal error constants */
      40             : #define PHP_BZ_ERRNO   0
      41             : #define PHP_BZ_ERRSTR  1
      42             : #define PHP_BZ_ERRBOTH 2
      43             : 
      44             : static PHP_MINIT_FUNCTION(bz2);
      45             : static PHP_MSHUTDOWN_FUNCTION(bz2);
      46             : static PHP_MINFO_FUNCTION(bz2);
      47             : static PHP_FUNCTION(bzopen);
      48             : static PHP_FUNCTION(bzread);
      49             : static PHP_FUNCTION(bzerrno);
      50             : static PHP_FUNCTION(bzerrstr);
      51             : static PHP_FUNCTION(bzerror);
      52             : static PHP_FUNCTION(bzcompress);
      53             : static PHP_FUNCTION(bzdecompress);
      54             : 
      55             : /* {{{ arginfo */
      56             : ZEND_BEGIN_ARG_INFO_EX(arginfo_bzread, 0, 0, 1)
      57             :         ZEND_ARG_INFO(0, bz)
      58             :         ZEND_ARG_INFO(0, length)
      59             : ZEND_END_ARG_INFO()
      60             : 
      61             : ZEND_BEGIN_ARG_INFO(arginfo_bzopen, 0)
      62             :         ZEND_ARG_INFO(0, file)
      63             :         ZEND_ARG_INFO(0, mode)
      64             : ZEND_END_ARG_INFO()
      65             : 
      66             : ZEND_BEGIN_ARG_INFO(arginfo_bzerrno, 0)
      67             :         ZEND_ARG_INFO(0, bz)
      68             : ZEND_END_ARG_INFO()
      69             : 
      70             : ZEND_BEGIN_ARG_INFO(arginfo_bzerrstr, 0)
      71             :         ZEND_ARG_INFO(0, bz)
      72             : ZEND_END_ARG_INFO()
      73             : 
      74             : ZEND_BEGIN_ARG_INFO(arginfo_bzerror, 0)
      75             :         ZEND_ARG_INFO(0, bz)
      76             : ZEND_END_ARG_INFO()
      77             : 
      78             : ZEND_BEGIN_ARG_INFO_EX(arginfo_bzcompress, 0, 0, 2)
      79             :         ZEND_ARG_INFO(0, source)
      80             :         ZEND_ARG_INFO(0, blocksize)
      81             :         ZEND_ARG_INFO(0, workfactor)
      82             : ZEND_END_ARG_INFO()
      83             : 
      84             : ZEND_BEGIN_ARG_INFO_EX(arginfo_bzdecompress, 0, 0, 1)
      85             :         ZEND_ARG_INFO(0, source)
      86             :         ZEND_ARG_INFO(0, small)
      87             : ZEND_END_ARG_INFO()
      88             : 
      89             : ZEND_BEGIN_ARG_INFO_EX(arginfo_bzwrite, 0, 0, 2)
      90             :         ZEND_ARG_INFO(0, fp)
      91             :         ZEND_ARG_INFO(0, str)
      92             :         ZEND_ARG_INFO(0, length)
      93             : ZEND_END_ARG_INFO()
      94             : 
      95             : ZEND_BEGIN_ARG_INFO(arginfo_bzflush, 0)
      96             :         ZEND_ARG_INFO(0, fp)
      97             : ZEND_END_ARG_INFO()
      98             : /* }}} */
      99             : 
     100             : static const zend_function_entry bz2_functions[] = {
     101             :         PHP_FE(bzopen,       arginfo_bzopen)
     102             :         PHP_FE(bzread,       arginfo_bzread)
     103             :         PHP_FALIAS(bzwrite,   fwrite,           arginfo_bzwrite)
     104             :         PHP_FALIAS(bzflush,   fflush,           arginfo_bzflush)
     105             :         PHP_FALIAS(bzclose,   fclose,           arginfo_bzflush)
     106             :         PHP_FE(bzerrno,      arginfo_bzerrno)
     107             :         PHP_FE(bzerrstr,     arginfo_bzerrstr)
     108             :         PHP_FE(bzerror,      arginfo_bzerror)
     109             :         PHP_FE(bzcompress,   arginfo_bzcompress)
     110             :         PHP_FE(bzdecompress, arginfo_bzdecompress)
     111             :         PHP_FE_END
     112             : };
     113             : 
     114             : zend_module_entry bz2_module_entry = {
     115             :         STANDARD_MODULE_HEADER,
     116             :         "bz2",
     117             :         bz2_functions,
     118             :         PHP_MINIT(bz2),
     119             :         PHP_MSHUTDOWN(bz2),
     120             :         NULL,
     121             :         NULL,
     122             :         PHP_MINFO(bz2),
     123             :         NO_VERSION_YET,
     124             :         STANDARD_MODULE_PROPERTIES
     125             : };
     126             : 
     127             : #ifdef COMPILE_DL_BZ2
     128             : ZEND_GET_MODULE(bz2)
     129             : #endif
     130             : 
     131             : struct php_bz2_stream_data_t {
     132             :         BZFILE *bz_file;
     133             :         php_stream *stream;
     134             : };
     135             : 
     136             : /* {{{ BZip2 stream implementation */
     137             : 
     138           0 : static size_t php_bz2iop_read(php_stream *stream, char *buf, size_t count TSRMLS_DC)
     139             : {
     140           0 :         struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *) stream->abstract;
     141             :         size_t ret;
     142             :         
     143           0 :         ret = BZ2_bzread(self->bz_file, buf, count);
     144             : 
     145           0 :         if (ret == 0) {
     146           0 :                 stream->eof = 1;
     147             :         }
     148             : 
     149           0 :         return ret;
     150             : }
     151             : 
     152           0 : static size_t php_bz2iop_write(php_stream *stream, const char *buf, size_t count TSRMLS_DC)
     153             : {
     154           0 :         struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *) stream->abstract;
     155             : 
     156           0 :         return BZ2_bzwrite(self->bz_file, (char*)buf, count); 
     157             : }
     158             : 
     159           0 : static int php_bz2iop_close(php_stream *stream, int close_handle TSRMLS_DC)
     160             : {
     161           0 :         struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *)stream->abstract;
     162           0 :         int ret = EOF;
     163             :         
     164           0 :         if (close_handle) {
     165           0 :                 BZ2_bzclose(self->bz_file);
     166             :         }
     167             : 
     168           0 :         if (self->stream) {
     169           0 :                 php_stream_free(self->stream, PHP_STREAM_FREE_CLOSE | (close_handle == 0 ? PHP_STREAM_FREE_PRESERVE_HANDLE : 0));
     170             :         }
     171             : 
     172           0 :         efree(self);
     173             : 
     174           0 :         return ret;
     175             : }
     176             : 
     177           0 : static int php_bz2iop_flush(php_stream *stream TSRMLS_DC)
     178             : {
     179           0 :         struct php_bz2_stream_data_t *self = (struct php_bz2_stream_data_t *)stream->abstract;
     180           0 :         return BZ2_bzflush(self->bz_file);
     181             : }
     182             : /* }}} */
     183             : 
     184             : php_stream_ops php_stream_bz2io_ops = {
     185             :         php_bz2iop_write, php_bz2iop_read,
     186             :         php_bz2iop_close, php_bz2iop_flush,
     187             :         "BZip2",
     188             :         NULL, /* seek */
     189             :         NULL, /* cast */
     190             :         NULL, /* stat */
     191             :         NULL  /* set_option */
     192             : };
     193             : 
     194             : /* {{{ Bzip2 stream openers */
     195           0 : PHP_BZ2_API php_stream *_php_stream_bz2open_from_BZFILE(BZFILE *bz, 
     196             :                                                                                                                 const char *mode, php_stream *innerstream STREAMS_DC TSRMLS_DC)
     197             : {
     198             :         struct php_bz2_stream_data_t *self;
     199             :         
     200           0 :         self = emalloc(sizeof(*self));
     201             : 
     202           0 :         self->stream = innerstream;
     203           0 :         self->bz_file = bz;
     204             : 
     205           0 :         return php_stream_alloc_rel(&php_stream_bz2io_ops, self, 0, mode);
     206             : }
     207             : 
     208           0 : PHP_BZ2_API php_stream *_php_stream_bz2open(php_stream_wrapper *wrapper,
     209             :                                                                                         const char *path,
     210             :                                                                                         const char *mode,
     211             :                                                                                         int options,
     212             :                                                                                         char **opened_path,
     213             :                                                                                         php_stream_context *context STREAMS_DC TSRMLS_DC)
     214             : {
     215           0 :         php_stream *retstream = NULL, *stream = NULL;
     216           0 :         char *path_copy = NULL;
     217           0 :         BZFILE *bz_file = NULL;
     218             : 
     219           0 :         if (strncasecmp("compress.bzip2://", path, 17) == 0) {
     220           0 :                 path += 17;
     221             :         }
     222           0 :         if (mode[0] == '\0' || (mode[0] != 'w' && mode[0] != 'r' && mode[1] != '\0')) {
     223           0 :                 return NULL;
     224             :         }
     225             : 
     226             : #ifdef VIRTUAL_DIR
     227             :         virtual_filepath_ex(path, &path_copy, NULL TSRMLS_CC);
     228             : #else
     229           0 :         path_copy = path;
     230             : #endif  
     231             : 
     232           0 :         if (php_check_open_basedir(path_copy TSRMLS_CC)) {
     233           0 :                 return NULL;
     234             :         }
     235             :         
     236             :         /* try and open it directly first */
     237           0 :         bz_file = BZ2_bzopen(path_copy, mode);
     238             : 
     239           0 :         if (opened_path && bz_file) {
     240           0 :                 *opened_path = estrdup(path_copy);
     241             :         }
     242           0 :         path_copy = NULL;
     243             :         
     244           0 :         if (bz_file == NULL) {
     245             :                 /* that didn't work, so try and get something from the network/wrapper */
     246           0 :                 stream = php_stream_open_wrapper(path, mode, options | STREAM_WILL_CAST, opened_path);
     247             :         
     248           0 :                 if (stream) {
     249             :                         php_socket_t fd;
     250           0 :                         if (SUCCESS == php_stream_cast(stream, PHP_STREAM_AS_FD, (void **) &fd, REPORT_ERRORS)) {
     251           0 :                                 bz_file = BZ2_bzdopen(fd, mode);
     252             :                         }
     253             :                 }
     254             : 
     255             :                 /* remove the file created by php_stream_open_wrapper(), it is not needed since BZ2 functions
     256             :                  * failed.
     257             :                  */
     258           0 :                 if (opened_path && !bz_file && mode[0] == 'w') {
     259           0 :                         VCWD_UNLINK(*opened_path);
     260             :                 }
     261             :         }
     262             :         
     263           0 :         if (bz_file) {
     264           0 :                 retstream = _php_stream_bz2open_from_BZFILE(bz_file, mode, stream STREAMS_REL_CC TSRMLS_CC);
     265           0 :                 if (retstream) {
     266           0 :                         return retstream;
     267             :                 }
     268             : 
     269           0 :                 BZ2_bzclose(bz_file);
     270             :         }
     271             : 
     272           0 :         if (stream) {
     273           0 :                 php_stream_close(stream);
     274             :         }
     275             : 
     276           0 :         return NULL;
     277             : }
     278             : 
     279             : /* }}} */
     280             : 
     281             : static php_stream_wrapper_ops bzip2_stream_wops = {
     282             :         _php_stream_bz2open,
     283             :         NULL, /* close */
     284             :         NULL, /* fstat */
     285             :         NULL, /* stat */
     286             :         NULL, /* opendir */
     287             :         "BZip2",
     288             :         NULL, /* unlink */
     289             :         NULL, /* rename */
     290             :         NULL, /* mkdir */
     291             :         NULL  /* rmdir */
     292             : };
     293             : 
     294             : static php_stream_wrapper php_stream_bzip2_wrapper = {
     295             :         &bzip2_stream_wops,
     296             :         NULL,
     297             :         0 /* is_url */
     298             : };
     299             : 
     300             : static void php_bz2_error(INTERNAL_FUNCTION_PARAMETERS, int);
     301             : 
     302           0 : static PHP_MINIT_FUNCTION(bz2)
     303             : {
     304           0 :         php_register_url_stream_wrapper("compress.bzip2", &php_stream_bzip2_wrapper TSRMLS_CC);
     305           0 :         php_stream_filter_register_factory("bzip2.*", &php_bz2_filter_factory TSRMLS_CC);
     306           0 :         return SUCCESS;
     307             : }
     308             : 
     309           0 : static PHP_MSHUTDOWN_FUNCTION(bz2)
     310             : {
     311           0 :         php_unregister_url_stream_wrapper("compress.bzip2" TSRMLS_CC);
     312           0 :         php_stream_filter_unregister_factory("bzip2.*" TSRMLS_CC);
     313             : 
     314           0 :         return SUCCESS;
     315             : }
     316             : 
     317           0 : static PHP_MINFO_FUNCTION(bz2)
     318             : {
     319           0 :         php_info_print_table_start();
     320           0 :         php_info_print_table_row(2, "BZip2 Support", "Enabled");
     321           0 :         php_info_print_table_row(2, "Stream Wrapper support", "compress.bzip2://");
     322           0 :         php_info_print_table_row(2, "Stream Filter support", "bzip2.decompress, bzip2.compress");
     323           0 :         php_info_print_table_row(2, "BZip2 Version", (char *) BZ2_bzlibVersion());
     324           0 :         php_info_print_table_end();
     325           0 : }
     326             : 
     327             : /* {{{ proto string bzread(resource bz[, int length])
     328             :    Reads up to length bytes from a BZip2 stream, or 1024 bytes if length is not specified */
     329           0 : static PHP_FUNCTION(bzread)
     330             : {
     331             :         zval *bz;
     332           0 :         long len = 1024;
     333             :         php_stream *stream;
     334             : 
     335           0 :         if (FAILURE == zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r|l", &bz, &len)) {
     336           0 :                 RETURN_FALSE;
     337             :         }
     338             :         
     339           0 :         php_stream_from_zval(stream, &bz);
     340             : 
     341           0 :         if ((len + 1) < 1) {
     342           0 :                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "length may not be negative");
     343           0 :                 RETURN_FALSE;
     344             :         }
     345             : 
     346           0 :         Z_STRVAL_P(return_value) = emalloc(len + 1);
     347           0 :         Z_STRLEN_P(return_value) = php_stream_read(stream, Z_STRVAL_P(return_value), len);
     348             :         
     349           0 :         if (Z_STRLEN_P(return_value) < 0) {
     350           0 :                 efree(Z_STRVAL_P(return_value));
     351           0 :                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "could not read valid bz2 data from stream");
     352           0 :                 RETURN_FALSE;           
     353             :         }
     354             :         
     355           0 :         Z_STRVAL_P(return_value)[Z_STRLEN_P(return_value)] = 0;
     356           0 :         Z_TYPE_P(return_value) = IS_STRING;
     357             : }
     358             : /* }}} */
     359             : 
     360             : /* {{{ proto resource bzopen(string|int file|fp, string mode)
     361             :    Opens a new BZip2 stream */
     362           0 : static PHP_FUNCTION(bzopen)
     363             : {
     364             :         zval    **file;   /* The file to open */
     365             :         char     *mode;   /* The mode to open the stream with */
     366             :         int      mode_len;
     367             : 
     368             :         BZFILE   *bz;     /* The compressed file stream */
     369           0 :         php_stream *stream = NULL;
     370             :         
     371           0 :         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "Zs", &file, &mode, &mode_len) == FAILURE) {
     372           0 :                 return;
     373             :         }
     374             : 
     375           0 :         if (mode_len != 1 || (mode[0] != 'r' && mode[0] != 'w')) {
     376           0 :                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "'%s' is not a valid mode for bzopen(). Only 'w' and 'r' are supported.", mode);
     377           0 :                 RETURN_FALSE;
     378             :         }
     379             : 
     380             :         /* If it's not a resource its a string containing the filename to open */
     381           0 :         if (Z_TYPE_PP(file) == IS_STRING) {
     382           0 :                 if (Z_STRLEN_PP(file) == 0) {
     383           0 :                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "filename cannot be empty");
     384           0 :                         RETURN_FALSE;
     385             :                 }
     386             :                 
     387           0 :                 if (CHECK_ZVAL_NULL_PATH(*file)) {
     388           0 :                         RETURN_FALSE;
     389             :                 }
     390             : 
     391           0 :                 stream = php_stream_bz2open(NULL,
     392             :                                                                         Z_STRVAL_PP(file), 
     393             :                                                                         mode, 
     394             :                                                                         REPORT_ERRORS, 
     395             :                                                                         NULL);
     396           0 :         } else if (Z_TYPE_PP(file) == IS_RESOURCE) {
     397             :                 /* If it is a resource, than its a stream resource */
     398             :                 php_socket_t fd;
     399             :                 int stream_mode_len;
     400             : 
     401           0 :                 php_stream_from_zval(stream, file);
     402           0 :                 stream_mode_len = strlen(stream->mode);
     403             :                 
     404           0 :                 if (stream_mode_len != 1 && !(stream_mode_len == 2 && memchr(stream->mode, 'b', 2))) {
     405           0 :                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot use stream opened in mode '%s'", stream->mode);
     406           0 :                         RETURN_FALSE;
     407           0 :                 } else if (stream_mode_len == 1 && stream->mode[0] != 'r' && stream->mode[0] != 'w' && stream->mode[0] != 'a' && stream->mode[0] != 'x') {
     408           0 :                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot use stream opened in mode '%s'", stream->mode);
     409           0 :                         RETURN_FALSE;
     410             :                 }
     411             : 
     412           0 :                 switch(mode[0]) {
     413             :                         case 'r':
     414             :                                 /* only "r" and "rb" are supported */
     415           0 :                                 if (stream->mode[0] != mode[0] && !(stream_mode_len == 2 && stream->mode[1] != mode[0])) {
     416           0 :                                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot read from a stream opened in write only mode");
     417           0 :                                         RETURN_FALSE;
     418             :                                 }
     419           0 :                                 break;
     420             :                         case 'w':
     421             :                                 /* support only "w"(b), "a"(b), "x"(b) */
     422           0 :                                 if (stream->mode[0] != mode[0] && !(stream_mode_len == 2 && stream->mode[1] != mode[0])
     423           0 :                                         && stream->mode[0] != 'a' && !(stream_mode_len == 2 && stream->mode[1] != 'a')
     424           0 :                                         && stream->mode[0] != 'x' && !(stream_mode_len == 2 && stream->mode[1] != 'x')) {
     425           0 :                                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot write to a stream opened in read only mode");
     426           0 :                                         RETURN_FALSE;
     427             :                                 }
     428             :                                 break;
     429             :                         default:
     430             :                                 /* not reachable */
     431             :                                 break;
     432             :                 }
     433             : 
     434           0 :                 if (FAILURE == php_stream_cast(stream, PHP_STREAM_AS_FD, (void *) &fd, REPORT_ERRORS)) {
     435           0 :                         RETURN_FALSE;
     436             :                 }
     437             :                 
     438           0 :                 bz = BZ2_bzdopen(fd, mode);
     439             : 
     440           0 :                 stream = php_stream_bz2open_from_BZFILE(bz, mode, stream);
     441             :         } else {
     442           0 :                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "first parameter has to be string or file-resource");
     443           0 :                 RETURN_FALSE;
     444             :         }
     445             : 
     446           0 :         if (stream) {
     447           0 :                 php_stream_to_zval(stream, return_value);
     448             :         } else {
     449           0 :                 RETURN_FALSE;
     450             :         }
     451             : }
     452             : /* }}} */
     453             : 
     454             : /* {{{ proto int bzerrno(resource bz)
     455             :    Returns the error number */
     456           0 : static PHP_FUNCTION(bzerrno)
     457             : {
     458           0 :         php_bz2_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_BZ_ERRNO);
     459           0 : }
     460             : /* }}} */
     461             : 
     462             : /* {{{ proto string bzerrstr(resource bz)
     463             :    Returns the error string */
     464           0 : static PHP_FUNCTION(bzerrstr)
     465             : {
     466           0 :         php_bz2_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_BZ_ERRSTR);
     467           0 : }
     468             : /* }}} */
     469             : 
     470             : /* {{{ proto array bzerror(resource bz)
     471             :    Returns the error number and error string in an associative array */
     472           0 : static PHP_FUNCTION(bzerror)
     473             : {
     474           0 :         php_bz2_error(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_BZ_ERRBOTH);
     475           0 : }
     476             : /* }}} */
     477             : 
     478             : /* {{{ proto string bzcompress(string source [, int blocksize100k [, int workfactor]])
     479             :    Compresses a string into BZip2 encoded data */
     480           0 : static PHP_FUNCTION(bzcompress)
     481             : {
     482             :         char             *source;          /* Source data to compress */
     483           0 :         long              zblock_size = 0; /* Optional block size to use */
     484           0 :         long              zwork_factor = 0;/* Optional work factor to use */
     485           0 :         char             *dest = NULL;     /* Destination to place the compressed data into */
     486             :         int               error,           /* Error Container */
     487           0 :                                           block_size  = 4, /* Block size for compression algorithm */
     488           0 :                                           work_factor = 0, /* Work factor for compression algorithm */
     489             :                                           argc;            /* Argument count */
     490             :         int               source_len;      /* Length of the source data */
     491             :         unsigned int      dest_len;        /* Length of the destination buffer */ 
     492             : 
     493           0 :         argc = ZEND_NUM_ARGS();
     494             : 
     495           0 :         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|ll", &source, &source_len, &zblock_size, &zwork_factor) == FAILURE) {
     496           0 :                 return;
     497             :         }
     498             : 
     499             :         /* Assign them to easy to use variables, dest_len is initially the length of the data
     500             :            + .01 x length of data + 600 which is the largest size the results of the compression 
     501             :            could possibly be, at least that's what the libbz2 docs say (thanks to jeremy@nirvani.net 
     502             :            for pointing this out).  */
     503           0 :         dest_len   = (unsigned int) (source_len + (0.01 * source_len) + 600);
     504             :         
     505             :         /* Allocate the destination buffer */
     506           0 :         dest = emalloc(dest_len + 1);
     507             :         
     508             :         /* Handle the optional arguments */
     509           0 :         if (argc > 1) {
     510           0 :                 block_size = zblock_size;
     511             :         }
     512             :         
     513           0 :         if (argc > 2) {
     514           0 :                 work_factor = zwork_factor;
     515             :         }
     516             : 
     517           0 :         error = BZ2_bzBuffToBuffCompress(dest, &dest_len, source, source_len, block_size, 0, work_factor);
     518           0 :         if (error != BZ_OK) {
     519           0 :                 efree(dest);
     520           0 :                 RETURN_LONG(error);
     521             :         } else {
     522             :                 /* Copy the buffer, we have perhaps allocate a lot more than we need,
     523             :                    so we erealloc() the buffer to the proper size */
     524           0 :                 dest = erealloc(dest, dest_len + 1);
     525           0 :                 dest[dest_len] = 0;
     526           0 :                 RETURN_STRINGL(dest, dest_len, 0);
     527             :         }
     528             : }
     529             : /* }}} */
     530             : 
     531             : /* {{{ proto string bzdecompress(string source [, int small])
     532             :    Decompresses BZip2 compressed data */
     533           0 : static PHP_FUNCTION(bzdecompress)
     534             : {
     535             :         char *source, *dest;
     536             :         int source_len, error;
     537           0 :         long small = 0;
     538             : #if defined(PHP_WIN32)
     539             :         unsigned __int64 size = 0;
     540             : #else
     541           0 :         unsigned long long size = 0;
     542             : #endif
     543             :         bz_stream bzs;
     544             : 
     545           0 :         if (FAILURE == zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|l", &source, &source_len, &small)) {
     546           0 :                 RETURN_FALSE;
     547             :         }
     548             : 
     549           0 :         bzs.bzalloc = NULL;
     550           0 :         bzs.bzfree = NULL;
     551             : 
     552           0 :         if (BZ2_bzDecompressInit(&bzs, 0, small) != BZ_OK) {
     553           0 :                 RETURN_FALSE;
     554             :         }
     555             : 
     556           0 :         bzs.next_in = source;
     557           0 :         bzs.avail_in = source_len;
     558             : 
     559             :         /* in most cases bz2 offers at least 2:1 compression, so we use that as our base */
     560           0 :         bzs.avail_out = source_len * 2;
     561           0 :         bzs.next_out = dest = emalloc(bzs.avail_out + 1);
     562             :         
     563           0 :         while ((error = BZ2_bzDecompress(&bzs)) == BZ_OK && bzs.avail_in > 0) {
     564             :                 /* compression is better then 2:1, need to allocate more memory */
     565           0 :                 bzs.avail_out = source_len;
     566           0 :                 size = (bzs.total_out_hi32 * (unsigned int) -1) + bzs.total_out_lo32;
     567           0 :                 dest = safe_erealloc(dest, 1, bzs.avail_out+1, (size_t) size );
     568           0 :                 bzs.next_out = dest + size;
     569             :         }
     570             : 
     571           0 :         if (error == BZ_STREAM_END || error == BZ_OK) {
     572           0 :                 size = (bzs.total_out_hi32 * (unsigned int) -1) + bzs.total_out_lo32;
     573           0 :                 dest = safe_erealloc(dest, 1, (size_t) size, 1);
     574           0 :                 dest[size] = '\0';
     575           0 :                 RETVAL_STRINGL(dest, (int) size, 0);
     576             :         } else { /* real error */
     577           0 :                 efree(dest);
     578           0 :                 RETVAL_LONG(error);
     579             :         }
     580             : 
     581           0 :         BZ2_bzDecompressEnd(&bzs);
     582             : }
     583             : /* }}} */
     584             : 
     585             : /* {{{ php_bz2_error()
     586             :    The central error handling interface, does the work for bzerrno, bzerrstr and bzerror */
     587           0 : static void php_bz2_error(INTERNAL_FUNCTION_PARAMETERS, int opt)
     588             : { 
     589             :         zval         *bzp;     /* BZip2 Resource Pointer */
     590             :         php_stream   *stream;
     591             :         const char   *errstr;  /* Error string */
     592             :         int           errnum;  /* Error number */
     593             :         struct php_bz2_stream_data_t *self;
     594             :         
     595           0 :         if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &bzp) == FAILURE) {
     596           0 :                 return;
     597             :         }
     598             : 
     599           0 :         php_stream_from_zval(stream, &bzp);
     600             : 
     601           0 :         if (!php_stream_is(stream, PHP_STREAM_IS_BZIP2)) {
     602           0 :                 RETURN_FALSE;
     603             :         }
     604             : 
     605           0 :         self = (struct php_bz2_stream_data_t *) stream->abstract;
     606             :         
     607             :         /* Fetch the error information */
     608           0 :         errstr = BZ2_bzerror(self->bz_file, &errnum);
     609             :         
     610             :         /* Determine what to return */
     611           0 :         switch (opt) {
     612             :                 case PHP_BZ_ERRNO:
     613           0 :                         RETURN_LONG(errnum);
     614             :                         break;
     615             :                 case PHP_BZ_ERRSTR:
     616           0 :                         RETURN_STRING((char*)errstr, 1);
     617             :                         break;
     618             :                 case PHP_BZ_ERRBOTH:
     619           0 :                         array_init(return_value);
     620             :                 
     621           0 :                         add_assoc_long  (return_value, "errno",  errnum);
     622           0 :                         add_assoc_string(return_value, "errstr", (char*)errstr, 1);
     623             :                         break;
     624             :         }
     625             : }
     626             : /* }}} */
     627             : 
     628             : #endif
     629             : 
     630             : /*
     631             :  * Local variables:
     632             :  * tab-width: 4
     633             :  * c-basic-offset: 4
     634             :  * End:
     635             :  * vim600: fdm=marker
     636             :  * vim: noet sw=4 ts=4
     637             :  */

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