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

/*
   +----------------------------------------------------------------------+
   | PHP Version 5                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2015 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          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Author: Wez Furlong <wez@thebrainroom.com>, based on work by:        |
   |         Hartmut Holzgraefe <hholzgra@php.net>                        |
   +----------------------------------------------------------------------+
 */

/* $Id$ */

#define _GNU_SOURCE

#include "php.h"
#include "php_zlib.h"
#include "fopen_wrappers.h"

struct php_gz_stream_data_t     {
        gzFile gz_file;
        php_stream *stream;
};

static size_t php_gziop_read(php_stream *stream, char *buf, size_t count TSRMLS_DC)
{
        struct php_gz_stream_data_t *self = (struct php_gz_stream_data_t *) stream->abstract;
        int read;
        
        read = gzread(self->gz_file, buf, count);
        
        if (gzeof(self->gz_file)) {
                stream->eof = 1;
        }
                
        return (read < 0) ? 0 : read;
}

static size_t php_gziop_write(php_stream *stream, const char *buf, size_t count TSRMLS_DC)
{
        struct php_gz_stream_data_t *self = (struct php_gz_stream_data_t *) stream->abstract;
        int wrote;

        wrote = gzwrite(self->gz_file, (char *) buf, count);

        return (wrote < 0) ? 0 : wrote;
}

static int php_gziop_seek(php_stream *stream, off_t offset, int whence, off_t *newoffs TSRMLS_DC)
{
        struct php_gz_stream_data_t *self = (struct php_gz_stream_data_t *) stream->abstract;

        assert(self != NULL);

        if (whence == SEEK_END) {
                php_error_docref(NULL TSRMLS_CC, E_WARNING, "SEEK_END is not supported");
                return -1;
        }
        *newoffs = gzseek(self->gz_file, offset, whence);

        return (*newoffs < 0) ? -1 : 0;
}

static int php_gziop_close(php_stream *stream, int close_handle TSRMLS_DC)
{
        struct php_gz_stream_data_t *self = (struct php_gz_stream_data_t *) stream->abstract;
        int ret = EOF;
        
        if (close_handle) {
                if (self->gz_file) {
                        ret = gzclose(self->gz_file);
                        self->gz_file = NULL;
                }
                if (self->stream) {
                        php_stream_close(self->stream);
                        self->stream = NULL;
                }
        }
        efree(self);

        return ret;
}

static int php_gziop_flush(php_stream *stream TSRMLS_DC)
{
        struct php_gz_stream_data_t *self = (struct php_gz_stream_data_t *) stream->abstract;

        return gzflush(self->gz_file, Z_SYNC_FLUSH);
}

php_stream_ops php_stream_gzio_ops = {
        php_gziop_write, php_gziop_read,
        php_gziop_close, php_gziop_flush,
        "ZLIB",
        php_gziop_seek, 
        NULL, /* cast */
        NULL, /* stat */
        NULL  /* set_option */
};

php_stream *php_stream_gzopen(php_stream_wrapper *wrapper, char *path, char *mode, int options, 
                                                          char **opened_path, php_stream_context *context STREAMS_DC TSRMLS_DC)
{
        struct php_gz_stream_data_t *self;
        php_stream *stream = NULL, *innerstream = NULL;

        /* sanity check the stream: it can be either read-only or write-only */
        if (strchr(mode, '+')) {
                if (options & REPORT_ERRORS) {
                        php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot open a zlib stream for reading and writing at the same time!");
                }
                return NULL;
        }
        
        if (strncasecmp("compress.zlib://", path, 16) == 0) {
                path += 16;
        } else if (strncasecmp("zlib:", path, 5) == 0) {
                path += 5;
        }
        
        innerstream = php_stream_open_wrapper_ex(path, mode, STREAM_MUST_SEEK | options | STREAM_WILL_CAST, opened_path, context);
        
        if (innerstream) {
                int fd;

                if (SUCCESS == php_stream_cast(innerstream, PHP_STREAM_AS_FD, (void **) &fd, REPORT_ERRORS)) {
                        self = emalloc(sizeof(*self));
                        self->stream = innerstream;
                        self->gz_file = gzdopen(dup(fd), mode);

                        if (self->gz_file) {
                                stream = php_stream_alloc_rel(&php_stream_gzio_ops, self, 0, mode);
                                if (stream) {
                                        stream->flags |= PHP_STREAM_FLAG_NO_BUFFER;
                                        return stream;
                                }

                                gzclose(self->gz_file);
                        }

                        efree(self);
                        if (options & REPORT_ERRORS) {
                                php_error_docref(NULL TSRMLS_CC, E_WARNING, "gzopen failed");
                        }
                }

                php_stream_close(innerstream);
        }

        return NULL;
}

static php_stream_wrapper_ops gzip_stream_wops = {
        php_stream_gzopen,
        NULL, /* close */
        NULL, /* stat */
        NULL, /* stat_url */
        NULL, /* opendir */
        "ZLIB",
        NULL, /* unlink */
        NULL, /* rename */
        NULL, /* mkdir */
        NULL  /* rmdir */
};

php_stream_wrapper php_stream_gzip_wrapper =    {
        &gzip_stream_wops,
        NULL,
        0, /* is_url */
};

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