root/ext/zlib/zlib_fopen_wrapper.c

DEFINITIONS

1. php_gziop_read
2. php_gziop_write
3. php_gziop_seek
4. php_gziop_close
5. php_gziop_flush
6. php_stream_gzopen

   1 /*
   2    +----------------------------------------------------------------------+
   3    | PHP Version 5                                                        |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 1997-2016 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: Wez Furlong <wez@thebrainroom.com>, based on work by:        |
  16    |         Hartmut Holzgraefe <hholzgra@php.net>                        |
  17    +----------------------------------------------------------------------+
  18  */
  19 
  20 /* $Id$ */
  21 
  22 #define _GNU_SOURCE
  23 
  24 #include "php.h"
  25 #include "php_zlib.h"
  26 #include "fopen_wrappers.h"
  27 
  28 #include "main/php_network.h"
  29 
  30 struct php_gz_stream_data_t     {
  31         gzFile gz_file;
  32         php_stream *stream;
  33 };
  34 
  35 static size_t php_gziop_read(php_stream *stream, char *buf, size_t count TSRMLS_DC)
  36 {
  37         struct php_gz_stream_data_t *self = (struct php_gz_stream_data_t *) stream->abstract;
  38         int read;
  39         
  40         read = gzread(self->gz_file, buf, count);
  41         
  42         if (gzeof(self->gz_file)) {
  43                 stream->eof = 1;
  44         }
  45                 
  46         return (read < 0) ? 0 : read;
  47 }
  48 
  49 static size_t php_gziop_write(php_stream *stream, const char *buf, size_t count TSRMLS_DC)
  50 {
  51         struct php_gz_stream_data_t *self = (struct php_gz_stream_data_t *) stream->abstract;
  52         int wrote;
  53 
  54         wrote = gzwrite(self->gz_file, (char *) buf, count);
  55 
  56         return (wrote < 0) ? 0 : wrote;
  57 }
  58 
  59 static int php_gziop_seek(php_stream *stream, off_t offset, int whence, off_t *newoffs TSRMLS_DC)
  60 {
  61         struct php_gz_stream_data_t *self = (struct php_gz_stream_data_t *) stream->abstract;
  62 
  63         assert(self != NULL);
  64 
  65         if (whence == SEEK_END) {
  66                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "SEEK_END is not supported");
  67                 return -1;
  68         }
  69         *newoffs = gzseek(self->gz_file, offset, whence);
  70 
  71         return (*newoffs < 0) ? -1 : 0;
  72 }
  73 
  74 static int php_gziop_close(php_stream *stream, int close_handle TSRMLS_DC)
  75 {
  76         struct php_gz_stream_data_t *self = (struct php_gz_stream_data_t *) stream->abstract;
  77         int ret = EOF;
  78         
  79         if (close_handle) {
  80                 if (self->gz_file) {
  81                         ret = gzclose(self->gz_file);
  82                         self->gz_file = NULL;
  83                 }
  84                 if (self->stream) {
  85                         php_stream_close(self->stream);
  86                         self->stream = NULL;
  87                 }
  88         }
  89         efree(self);
  90 
  91         return ret;
  92 }
  93 
  94 static int php_gziop_flush(php_stream *stream TSRMLS_DC)
  95 {
  96         struct php_gz_stream_data_t *self = (struct php_gz_stream_data_t *) stream->abstract;
  97 
  98         return gzflush(self->gz_file, Z_SYNC_FLUSH);
  99 }
 100 
 101 php_stream_ops php_stream_gzio_ops = {
 102         php_gziop_write, php_gziop_read,
 103         php_gziop_close, php_gziop_flush,
 104         "ZLIB",
 105         php_gziop_seek, 
 106         NULL, /* cast */
 107         NULL, /* stat */
 108         NULL  /* set_option */
 109 };
 110 
 111 php_stream *php_stream_gzopen(php_stream_wrapper *wrapper, const char *path, const char *mode, int options, 
 112                                                           char **opened_path, php_stream_context *context STREAMS_DC TSRMLS_DC)
 113 {
 114         struct php_gz_stream_data_t *self;
 115         php_stream *stream = NULL, *innerstream = NULL;
 116 
 117         /* sanity check the stream: it can be either read-only or write-only */
 118         if (strchr(mode, '+')) {
 119                 if (options & REPORT_ERRORS) {
 120                         php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot open a zlib stream for reading and writing at the same time!");
 121                 }
 122                 return NULL;
 123         }
 124         
 125         if (strncasecmp("compress.zlib://", path, 16) == 0) {
 126                 path += 16;
 127         } else if (strncasecmp("zlib:", path, 5) == 0) {
 128                 path += 5;
 129         }
 130         
 131         innerstream = php_stream_open_wrapper_ex(path, mode, STREAM_MUST_SEEK | options | STREAM_WILL_CAST, opened_path, context);
 132         
 133         if (innerstream) {
 134                 php_socket_t fd;
 135 
 136                 if (SUCCESS == php_stream_cast(innerstream, PHP_STREAM_AS_FD, (void **) &fd, REPORT_ERRORS)) {
 137                         self = emalloc(sizeof(*self));
 138                         self->stream = innerstream;
 139                         self->gz_file = gzdopen(dup(fd), mode);
 140 
 141                         if (self->gz_file) {
 142                                 stream = php_stream_alloc_rel(&php_stream_gzio_ops, self, 0, mode);
 143                                 if (stream) {
 144                                         stream->flags |= PHP_STREAM_FLAG_NO_BUFFER;
 145                                         return stream;
 146                                 }
 147 
 148                                 gzclose(self->gz_file);
 149                         }
 150 
 151                         efree(self);
 152                         if (options & REPORT_ERRORS) {
 153                                 php_error_docref(NULL TSRMLS_CC, E_WARNING, "gzopen failed");
 154                         }
 155                 }
 156 
 157                 php_stream_close(innerstream);
 158         }
 159 
 160         return NULL;
 161 }
 162 
 163 static php_stream_wrapper_ops gzip_stream_wops = {
 164         php_stream_gzopen,
 165         NULL, /* close */
 166         NULL, /* stat */
 167         NULL, /* stat_url */
 168         NULL, /* opendir */
 169         "ZLIB",
 170         NULL, /* unlink */
 171         NULL, /* rename */
 172         NULL, /* mkdir */
 173         NULL  /* rmdir */
 174 };
 175 
 176 php_stream_wrapper php_stream_gzip_wrapper =    {
 177         &gzip_stream_wops,
 178         NULL,
 179         0, /* is_url */
 180 };
 181 
 182 /*
 183  * Local variables:
 184  * tab-width: 4
 185  * c-basic-offset: 4
 186  * End:
 187  * vim600: noet sw=4 ts=4 fdm=marker
 188  * vim<600: noet sw=4 ts=4
 189  */