php-src/main/streams/cast.c

351 lines
9.8 KiB
C

/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2004 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.0 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_0.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. |
+----------------------------------------------------------------------+
| Authors: Wez Furlong <wez@thebrainroom.com> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#define _GNU_SOURCE
#include "php.h"
#include "php_globals.h"
#include "php_network.h"
#include "php_open_temporary_file.h"
#include "ext/standard/file.h"
#include <stddef.h>
#include <fcntl.h>
#include "php_streams_int.h"
/* Under BSD, emulate fopencookie using funopen */
#if HAVE_FUNOPEN
typedef struct {
int (*reader)(void *, char *, int);
int (*writer)(void *, const char *, int);
fpos_t (*seeker)(void *, fpos_t, int);
int (*closer)(void *);
} COOKIE_IO_FUNCTIONS_T;
FILE *fopencookie(void *cookie, const char *mode, COOKIE_IO_FUNCTIONS_T *funcs)
{
return funopen(cookie, funcs->reader, funcs->writer, funcs->seeker, funcs->closer);
}
# define HAVE_FOPENCOOKIE 1
# define PHP_STREAM_COOKIE_FUNCTIONS &stream_cookie_functions
#elif HAVE_FOPENCOOKIE
# define PHP_STREAM_COOKIE_FUNCTIONS stream_cookie_functions
#endif
/* {{{ STDIO with fopencookie */
#if HAVE_FUNOPEN
/* use our fopencookie emulation */
static int stream_cookie_reader(void *cookie, char *buffer, int size)
{
int ret;
TSRMLS_FETCH();
ret = php_stream_read((php_stream*)cookie, buffer, size);
return ret;
}
static int stream_cookie_writer(void *cookie, const char *buffer, int size)
{
TSRMLS_FETCH();
return php_stream_write((php_stream *)cookie, (char *)buffer, size);
}
static fpos_t stream_cookie_seeker(void *cookie, off_t position, int whence)
{
TSRMLS_FETCH();
return (fpos_t)php_stream_seek((php_stream *)cookie, position, whence);
}
static int stream_cookie_closer(void *cookie)
{
php_stream *stream = (php_stream*)cookie;
TSRMLS_FETCH();
/* prevent recursion */
stream->fclose_stdiocast = PHP_STREAM_FCLOSE_NONE;
return php_stream_close(stream);
}
#elif HAVE_FOPENCOOKIE
static ssize_t stream_cookie_reader(void *cookie, char *buffer, size_t size)
{
ssize_t ret;
TSRMLS_FETCH();
ret = php_stream_read(((php_stream *)cookie), buffer, size);
return ret;
}
static ssize_t stream_cookie_writer(void *cookie, const char *buffer, size_t size)
{
TSRMLS_FETCH();
return php_stream_write(((php_stream *)cookie), (char *)buffer, size);
}
#ifdef COOKIE_SEEKER_USES_OFF64_T
static int stream_cookie_seeker(void *cookie, __off64_t *position, int whence)
{
TSRMLS_FETCH();
*position = php_stream_seek((php_stream *)cookie, (off_t)*position, whence);
if (*position == -1)
return -1;
return 0;
}
#else
static int stream_cookie_seeker(void *cookie, off_t position, int whence)
{
TSRMLS_FETCH();
return php_stream_seek((php_stream *)cookie, position, whence);
}
#endif
static int stream_cookie_closer(void *cookie)
{
php_stream *stream = (php_stream*)cookie;
TSRMLS_FETCH();
/* prevent recursion */
stream->fclose_stdiocast = PHP_STREAM_FCLOSE_NONE;
return php_stream_close(stream);
}
#endif /* elif HAVE_FOPENCOOKIE */
#if HAVE_FOPENCOOKIE
static COOKIE_IO_FUNCTIONS_T stream_cookie_functions =
{
stream_cookie_reader, stream_cookie_writer,
stream_cookie_seeker, stream_cookie_closer
};
#else
/* TODO: use socketpair() to emulate fopencookie, as suggested by Hartmut ? */
#endif
/* }}} */
/* {{{ php_stream_cast */
PHPAPI int _php_stream_cast(php_stream *stream, int castas, void **ret, int show_err TSRMLS_DC)
{
int flags = castas & PHP_STREAM_CAST_MASK;
castas &= ~PHP_STREAM_CAST_MASK;
/* synchronize our buffer (if possible) */
if (ret && castas != PHP_STREAM_AS_FD_FOR_SELECT) {
php_stream_flush(stream);
if (stream->ops->seek && (stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0) {
off_t dummy;
stream->ops->seek(stream, stream->position, SEEK_SET, &dummy TSRMLS_CC);
stream->readpos = stream->writepos = 0;
}
}
/* filtered streams can only be cast as stdio, and only when fopencookie is present */
if (castas == PHP_STREAM_AS_STDIO) {
if (stream->stdiocast) {
if (ret) {
*(FILE**)ret = stream->stdiocast;
}
goto exit_success;
}
/* if the stream is a stdio stream let's give it a chance to respond
* first, to avoid doubling up the layers of stdio with an fopencookie */
if (php_stream_is(stream, PHP_STREAM_IS_STDIO) &&
stream->ops->cast &&
!php_stream_is_filtered(stream) &&
stream->ops->cast(stream, castas, ret TSRMLS_CC) == SUCCESS)
{
goto exit_success;
}
#if HAVE_FOPENCOOKIE
/* if just checking, say yes we can be a FILE*, but don't actually create it yet */
if (ret == NULL)
goto exit_success;
*(FILE**)ret = fopencookie(stream, stream->mode, PHP_STREAM_COOKIE_FUNCTIONS);
if (*ret != NULL) {
off_t pos;
stream->fclose_stdiocast = PHP_STREAM_FCLOSE_FOPENCOOKIE;
/* If the stream position is not at the start, we need to force
* the stdio layer to believe it's real location. */
pos = php_stream_tell(stream);
if (pos > 0)
fseek(*ret, pos, SEEK_SET);
goto exit_success;
}
/* must be either:
a) programmer error
b) no memory
-> lets bail
*/
php_error_docref(NULL TSRMLS_CC, E_ERROR, "fopencookie failed");
return FAILURE;
#endif
if (!php_stream_is_filtered(stream) && stream->ops->cast && stream->ops->cast(stream, castas, NULL TSRMLS_CC) == SUCCESS) {
if (FAILURE == stream->ops->cast(stream, castas, ret TSRMLS_CC)) {
return FAILURE;
}
goto exit_success;
} else if (flags & PHP_STREAM_CAST_TRY_HARD) {
php_stream *newstream;
newstream = php_stream_fopen_tmpfile();
if (newstream) {
size_t copied = php_stream_copy_to_stream(stream, newstream, PHP_STREAM_COPY_ALL);
if (copied == 0) {
php_stream_close(newstream);
} else {
int retcode = php_stream_cast(newstream, castas | flags, ret, show_err);
if (retcode == SUCCESS)
rewind(*(FILE**)ret);
/* do some specialized cleanup */
if ((flags & PHP_STREAM_CAST_RELEASE)) {
php_stream_free(stream, PHP_STREAM_FREE_CLOSE_CASTED);
}
return retcode;
}
}
}
}
if (php_stream_is_filtered(stream)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot cast a filtered stream on this system");
return FAILURE;
} else if (stream->ops->cast && stream->ops->cast(stream, castas, ret TSRMLS_CC) == SUCCESS) {
goto exit_success;
}
if (show_err) {
/* these names depend on the values of the PHP_STREAM_AS_XXX defines in php_streams.h */
static const char *cast_names[4] = {
"STDIO FILE*", "File Descriptor", "Socket Descriptor", "select()able descriptor"
};
php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot represent a stream of type %s as a %s",
stream->ops->label,
cast_names[castas]
);
}
return FAILURE;
exit_success:
if ((stream->writepos - stream->readpos) > 0 &&
stream->fclose_stdiocast != PHP_STREAM_FCLOSE_FOPENCOOKIE &&
(flags & PHP_STREAM_CAST_INTERNAL) == 0) {
/* the data we have buffered will be lost to the third party library that
* will be accessing the stream. Emit a warning so that the end-user will
* know that they should try something else */
php_error_docref(NULL TSRMLS_CC, E_WARNING,
"%ld bytes of buffered data lost during stream conversion!",
(long)(stream->writepos - stream->readpos));
}
if (castas == PHP_STREAM_AS_STDIO && ret)
stream->stdiocast = *(FILE**)ret;
if (flags & PHP_STREAM_CAST_RELEASE) {
php_stream_free(stream, PHP_STREAM_FREE_CLOSE_CASTED);
}
return SUCCESS;
}
/* }}} */
/* {{{ php_stream_open_wrapper_as_file */
PHPAPI FILE * _php_stream_open_wrapper_as_file(char *path, char *mode, int options, char **opened_path STREAMS_DC TSRMLS_DC)
{
FILE *fp = NULL;
php_stream *stream = NULL;
stream = php_stream_open_wrapper_rel(path, mode, options|STREAM_WILL_CAST, opened_path);
if (stream == NULL)
return NULL;
if (php_stream_cast(stream, PHP_STREAM_AS_STDIO|PHP_STREAM_CAST_TRY_HARD|PHP_STREAM_CAST_RELEASE,
(void**)&fp, REPORT_ERRORS) == FAILURE)
{
php_stream_close(stream);
if (opened_path && *opened_path)
efree(*opened_path);
return NULL;
}
return fp;
}
/* }}} */
/* {{{ php_stream_make_seekable */
PHPAPI int _php_stream_make_seekable(php_stream *origstream, php_stream **newstream, int flags STREAMS_DC TSRMLS_DC)
{
assert(newstream != NULL);
*newstream = NULL;
if (((flags & PHP_STREAM_FORCE_CONVERSION) == 0) && origstream->ops->seek != NULL) {
*newstream = origstream;
return PHP_STREAM_UNCHANGED;
}
/* Use a tmpfile and copy the old streams contents into it */
if (flags & PHP_STREAM_PREFER_STDIO)
*newstream = php_stream_fopen_tmpfile();
else
*newstream = php_stream_temp_new();
if (*newstream == NULL)
return PHP_STREAM_FAILED;
if (php_stream_copy_to_stream(origstream, *newstream, PHP_STREAM_COPY_ALL) == 0) {
php_stream_close(*newstream);
*newstream = NULL;
return PHP_STREAM_CRITICAL;
}
php_stream_close(origstream);
php_stream_seek(*newstream, 0, SEEK_SET);
return PHP_STREAM_RELEASED;
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/