/main/streams/streams.c
C | 2368 lines | 1742 code | 367 blank | 259 comment | 545 complexity | 70bdcabeb6650adf5f2632d35fef3af1 MD5 | raw file
Possible License(s): BSD-2-Clause, BSD-3-Clause, MPL-2.0-no-copyleft-exception, LGPL-2.1
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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: |
- | 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. |
- +----------------------------------------------------------------------+
- | Authors: Wez Furlong <wez@thebrainroom.com> |
- | Borrowed code from: |
- | Rasmus Lerdorf <rasmus@lerdorf.on.ca> |
- | Jim Winstead <jimw@php.net> |
- +----------------------------------------------------------------------+
- */
- #define _GNU_SOURCE
- #include "php.h"
- #include "php_globals.h"
- #include "php_memory_streams.h"
- #include "php_network.h"
- #include "php_open_temporary_file.h"
- #include "ext/standard/file.h"
- #include "ext/standard/basic_functions.h" /* for BG(CurrentStatFile) */
- #include "ext/standard/php_string.h" /* for php_memnstr, used by php_stream_get_record() */
- #include <stddef.h>
- #include <fcntl.h>
- #include "php_streams_int.h"
- /* {{{ resource and registration code */
- /* Global wrapper hash, copied to FG(stream_wrappers) on registration of volatile wrapper */
- static HashTable url_stream_wrappers_hash;
- static int le_stream = FAILURE; /* true global */
- static int le_pstream = FAILURE; /* true global */
- static int le_stream_filter = FAILURE; /* true global */
- PHPAPI int php_file_le_stream(void)
- {
- return le_stream;
- }
- PHPAPI int php_file_le_pstream(void)
- {
- return le_pstream;
- }
- PHPAPI int php_file_le_stream_filter(void)
- {
- return le_stream_filter;
- }
- PHPAPI HashTable *_php_stream_get_url_stream_wrappers_hash(void)
- {
- return (FG(stream_wrappers) ? FG(stream_wrappers) : &url_stream_wrappers_hash);
- }
- PHPAPI HashTable *php_stream_get_url_stream_wrappers_hash_global(void)
- {
- return &url_stream_wrappers_hash;
- }
- static int forget_persistent_resource_id_numbers(zval *el)
- {
- php_stream *stream;
- zend_resource *rsrc = Z_RES_P(el);
- if (rsrc->type != le_pstream) {
- return 0;
- }
- stream = (php_stream*)rsrc->ptr;
- #if STREAM_DEBUG
- fprintf(stderr, "forget_persistent: %s:%p\n", stream->ops->label, stream);
- #endif
- stream->res = NULL;
- if (stream->ctx) {
- zend_list_delete(stream->ctx);
- stream->ctx = NULL;
- }
- return 0;
- }
- PHP_RSHUTDOWN_FUNCTION(streams)
- {
- zval *el;
- ZEND_HASH_FOREACH_VAL(&EG(persistent_list), el) {
- forget_persistent_resource_id_numbers(el);
- } ZEND_HASH_FOREACH_END();
- return SUCCESS;
- }
- PHPAPI php_stream *php_stream_encloses(php_stream *enclosing, php_stream *enclosed)
- {
- php_stream *orig = enclosed->enclosing_stream;
- php_stream_auto_cleanup(enclosed);
- enclosed->enclosing_stream = enclosing;
- return orig;
- }
- PHPAPI int php_stream_from_persistent_id(const char *persistent_id, php_stream **stream)
- {
- zend_resource *le;
- if ((le = zend_hash_str_find_ptr(&EG(persistent_list), persistent_id, strlen(persistent_id))) != NULL) {
- if (le->type == le_pstream) {
- if (stream) {
- zend_resource *regentry = NULL;
- /* see if this persistent resource already has been loaded to the
- * regular list; allowing the same resource in several entries in the
- * regular list causes trouble (see bug #54623) */
- *stream = (php_stream*)le->ptr;
- ZEND_HASH_FOREACH_PTR(&EG(regular_list), regentry) {
- if (regentry->ptr == le->ptr) {
- GC_ADDREF(regentry);
- (*stream)->res = regentry;
- return PHP_STREAM_PERSISTENT_SUCCESS;
- }
- } ZEND_HASH_FOREACH_END();
- GC_ADDREF(le);
- (*stream)->res = zend_register_resource(*stream, le_pstream);
- }
- return PHP_STREAM_PERSISTENT_SUCCESS;
- }
- return PHP_STREAM_PERSISTENT_FAILURE;
- }
- return PHP_STREAM_PERSISTENT_NOT_EXIST;
- }
- /* }}} */
- static zend_llist *php_get_wrapper_errors_list(php_stream_wrapper *wrapper)
- {
- if (!FG(wrapper_errors)) {
- return NULL;
- } else {
- return (zend_llist*) zend_hash_str_find_ptr(FG(wrapper_errors), (const char*)&wrapper, sizeof(wrapper));
- }
- }
- /* {{{ wrapper error reporting */
- void php_stream_display_wrapper_errors(php_stream_wrapper *wrapper, const char *path, const char *caption)
- {
- char *tmp;
- char *msg;
- int free_msg = 0;
- if (EG(exception)) {
- /* Don't emit additional warnings if an exception has already been thrown. */
- return;
- }
- tmp = estrdup(path);
- if (wrapper) {
- zend_llist *err_list = php_get_wrapper_errors_list(wrapper);
- if (err_list) {
- size_t l = 0;
- int brlen;
- int i;
- int count = (int)zend_llist_count(err_list);
- const char *br;
- const char **err_buf_p;
- zend_llist_position pos;
- if (PG(html_errors)) {
- brlen = 7;
- br = "<br />\n";
- } else {
- brlen = 1;
- br = "\n";
- }
- for (err_buf_p = zend_llist_get_first_ex(err_list, &pos), i = 0;
- err_buf_p;
- err_buf_p = zend_llist_get_next_ex(err_list, &pos), i++) {
- l += strlen(*err_buf_p);
- if (i < count - 1) {
- l += brlen;
- }
- }
- msg = emalloc(l + 1);
- msg[0] = '\0';
- for (err_buf_p = zend_llist_get_first_ex(err_list, &pos), i = 0;
- err_buf_p;
- err_buf_p = zend_llist_get_next_ex(err_list, &pos), i++) {
- strcat(msg, *err_buf_p);
- if (i < count - 1) {
- strcat(msg, br);
- }
- }
- free_msg = 1;
- } else {
- if (wrapper == &php_plain_files_wrapper) {
- msg = strerror(errno); /* TODO: not ts on linux */
- } else {
- msg = "operation failed";
- }
- }
- } else {
- msg = "no suitable wrapper could be found";
- }
- php_strip_url_passwd(tmp);
- php_error_docref1(NULL, tmp, E_WARNING, "%s: %s", caption, msg);
- efree(tmp);
- if (free_msg) {
- efree(msg);
- }
- }
- void php_stream_tidy_wrapper_error_log(php_stream_wrapper *wrapper)
- {
- if (wrapper && FG(wrapper_errors)) {
- zend_hash_str_del(FG(wrapper_errors), (const char*)&wrapper, sizeof(wrapper));
- }
- }
- static void wrapper_error_dtor(void *error)
- {
- efree(*(char**)error);
- }
- static void wrapper_list_dtor(zval *item) {
- zend_llist *list = (zend_llist*)Z_PTR_P(item);
- zend_llist_destroy(list);
- efree(list);
- }
- PHPAPI void php_stream_wrapper_log_error(const php_stream_wrapper *wrapper, int options, const char *fmt, ...)
- {
- va_list args;
- char *buffer = NULL;
- va_start(args, fmt);
- vspprintf(&buffer, 0, fmt, args);
- va_end(args);
- if (options & REPORT_ERRORS || wrapper == NULL) {
- php_error_docref(NULL, E_WARNING, "%s", buffer);
- efree(buffer);
- } else {
- zend_llist *list = NULL;
- if (!FG(wrapper_errors)) {
- ALLOC_HASHTABLE(FG(wrapper_errors));
- zend_hash_init(FG(wrapper_errors), 8, NULL, wrapper_list_dtor, 0);
- } else {
- list = zend_hash_str_find_ptr(FG(wrapper_errors), (const char*)&wrapper, sizeof(wrapper));
- }
- if (!list) {
- zend_llist new_list;
- zend_llist_init(&new_list, sizeof(buffer), wrapper_error_dtor, 0);
- list = zend_hash_str_update_mem(FG(wrapper_errors), (const char*)&wrapper,
- sizeof(wrapper), &new_list, sizeof(new_list));
- }
- /* append to linked list */
- zend_llist_add_element(list, &buffer);
- }
- }
- /* }}} */
- /* allocate a new stream for a particular ops */
- PHPAPI php_stream *_php_stream_alloc(const php_stream_ops *ops, void *abstract, const char *persistent_id, const char *mode STREAMS_DC) /* {{{ */
- {
- php_stream *ret;
- ret = (php_stream*) pemalloc_rel_orig(sizeof(php_stream), persistent_id ? 1 : 0);
- memset(ret, 0, sizeof(php_stream));
- ret->readfilters.stream = ret;
- ret->writefilters.stream = ret;
- #if STREAM_DEBUG
- fprintf(stderr, "stream_alloc: %s:%p persistent=%s\n", ops->label, ret, persistent_id);
- #endif
- ret->ops = ops;
- ret->abstract = abstract;
- ret->is_persistent = persistent_id ? 1 : 0;
- ret->chunk_size = FG(def_chunk_size);
- #if ZEND_DEBUG
- ret->open_filename = __zend_orig_filename ? __zend_orig_filename : __zend_filename;
- ret->open_lineno = __zend_orig_lineno ? __zend_orig_lineno : __zend_lineno;
- #endif
- if (FG(auto_detect_line_endings)) {
- ret->flags |= PHP_STREAM_FLAG_DETECT_EOL;
- }
- if (persistent_id) {
- if (NULL == zend_register_persistent_resource(persistent_id, strlen(persistent_id), ret, le_pstream)) {
- pefree(ret, 1);
- return NULL;
- }
- }
- ret->res = zend_register_resource(ret, persistent_id ? le_pstream : le_stream);
- strlcpy(ret->mode, mode, sizeof(ret->mode));
- ret->wrapper = NULL;
- ret->wrapperthis = NULL;
- ZVAL_UNDEF(&ret->wrapperdata);
- ret->stdiocast = NULL;
- ret->orig_path = NULL;
- ret->ctx = NULL;
- ret->readbuf = NULL;
- ret->enclosing_stream = NULL;
- return ret;
- }
- /* }}} */
- PHPAPI int _php_stream_free_enclosed(php_stream *stream_enclosed, int close_options) /* {{{ */
- {
- return php_stream_free(stream_enclosed,
- close_options | PHP_STREAM_FREE_IGNORE_ENCLOSING);
- }
- /* }}} */
- #if STREAM_DEBUG
- static const char *_php_stream_pretty_free_options(int close_options, char *out)
- {
- if (close_options & PHP_STREAM_FREE_CALL_DTOR)
- strcat(out, "CALL_DTOR, ");
- if (close_options & PHP_STREAM_FREE_RELEASE_STREAM)
- strcat(out, "RELEASE_STREAM, ");
- if (close_options & PHP_STREAM_FREE_PRESERVE_HANDLE)
- strcat(out, "PREVERSE_HANDLE, ");
- if (close_options & PHP_STREAM_FREE_RSRC_DTOR)
- strcat(out, "RSRC_DTOR, ");
- if (close_options & PHP_STREAM_FREE_PERSISTENT)
- strcat(out, "PERSISTENT, ");
- if (close_options & PHP_STREAM_FREE_IGNORE_ENCLOSING)
- strcat(out, "IGNORE_ENCLOSING, ");
- if (out[0] != '\0')
- out[strlen(out) - 2] = '\0';
- return out;
- }
- #endif
- static int _php_stream_free_persistent(zval *zv, void *pStream)
- {
- zend_resource *le = Z_RES_P(zv);
- return le->ptr == pStream;
- }
- PHPAPI int _php_stream_free(php_stream *stream, int close_options) /* {{{ */
- {
- int ret = 1;
- int preserve_handle = close_options & PHP_STREAM_FREE_PRESERVE_HANDLE ? 1 : 0;
- int release_cast = 1;
- php_stream_context *context;
- /* During shutdown resources may be released before other resources still holding them.
- * When only resoruces are referenced this is not a problem, because they are refcounted
- * and will only be fully freed once the refcount drops to zero. However, if php_stream*
- * is held directly, we don't have this guarantee. To avoid use-after-free we ignore all
- * stream free operations in shutdown unless they come from the resource list destruction,
- * or by freeing an enclosed stream (in which case resource list destruction will not have
- * freed it). */
- if ((EG(flags) & EG_FLAGS_IN_RESOURCE_SHUTDOWN) &&
- !(close_options & (PHP_STREAM_FREE_RSRC_DTOR|PHP_STREAM_FREE_IGNORE_ENCLOSING))) {
- return 1;
- }
- context = PHP_STREAM_CONTEXT(stream);
- if (stream->flags & PHP_STREAM_FLAG_NO_CLOSE) {
- preserve_handle = 1;
- }
- #if STREAM_DEBUG
- {
- char out[200] = "";
- fprintf(stderr, "stream_free: %s:%p[%s] in_free=%d opts=%s\n",
- stream->ops->label, stream, stream->orig_path, stream->in_free, _php_stream_pretty_free_options(close_options, out));
- }
- #endif
- if (stream->in_free) {
- /* hopefully called recursively from the enclosing stream; the pointer was NULLed below */
- if ((stream->in_free == 1) && (close_options & PHP_STREAM_FREE_IGNORE_ENCLOSING) && (stream->enclosing_stream == NULL)) {
- close_options |= PHP_STREAM_FREE_RSRC_DTOR; /* restore flag */
- } else {
- return 1; /* recursion protection */
- }
- }
- stream->in_free++;
- /* force correct order on enclosing/enclosed stream destruction (only from resource
- * destructor as in when reverse destroying the resource list) */
- if ((close_options & PHP_STREAM_FREE_RSRC_DTOR) &&
- !(close_options & PHP_STREAM_FREE_IGNORE_ENCLOSING) &&
- (close_options & (PHP_STREAM_FREE_CALL_DTOR | PHP_STREAM_FREE_RELEASE_STREAM)) && /* always? */
- (stream->enclosing_stream != NULL)) {
- php_stream *enclosing_stream = stream->enclosing_stream;
- stream->enclosing_stream = NULL;
- /* we force PHP_STREAM_CALL_DTOR because that's from where the
- * enclosing stream can free this stream. */
- return php_stream_free(enclosing_stream,
- (close_options | PHP_STREAM_FREE_CALL_DTOR | PHP_STREAM_FREE_KEEP_RSRC) & ~PHP_STREAM_FREE_RSRC_DTOR);
- }
- /* if we are releasing the stream only (and preserving the underlying handle),
- * we need to do things a little differently.
- * We are only ever called like this when the stream is cast to a FILE*
- * for include (or other similar) purposes.
- * */
- if (preserve_handle) {
- if (stream->fclose_stdiocast == PHP_STREAM_FCLOSE_FOPENCOOKIE) {
- /* If the stream was fopencookied, we must NOT touch anything
- * here, as the cookied stream relies on it all.
- * Instead, mark the stream as OK to auto-clean */
- php_stream_auto_cleanup(stream);
- stream->in_free--;
- return 0;
- }
- /* otherwise, make sure that we don't close the FILE* from a cast */
- release_cast = 0;
- }
- #if STREAM_DEBUG
- fprintf(stderr, "stream_free: %s:%p[%s] preserve_handle=%d release_cast=%d remove_rsrc=%d\n",
- stream->ops->label, stream, stream->orig_path, preserve_handle, release_cast,
- (close_options & PHP_STREAM_FREE_RSRC_DTOR) == 0);
- #endif
- if (stream->flags & PHP_STREAM_FLAG_WAS_WRITTEN) {
- /* make sure everything is saved */
- _php_stream_flush(stream, 1);
- }
- /* If not called from the resource dtor, remove the stream from the resource list. */
- if ((close_options & PHP_STREAM_FREE_RSRC_DTOR) == 0 && stream->res) {
- /* Close resource, but keep it in resource list */
- zend_list_close(stream->res);
- if ((close_options & PHP_STREAM_FREE_KEEP_RSRC) == 0) {
- /* Completely delete zend_resource, if not referenced */
- zend_list_delete(stream->res);
- stream->res = NULL;
- }
- }
- if (close_options & PHP_STREAM_FREE_CALL_DTOR) {
- if (release_cast && stream->fclose_stdiocast == PHP_STREAM_FCLOSE_FOPENCOOKIE) {
- /* calling fclose on an fopencookied stream will ultimately
- call this very same function. If we were called via fclose,
- the cookie_closer unsets the fclose_stdiocast flags, so
- we can be sure that we only reach here when PHP code calls
- php_stream_free.
- Lets let the cookie code clean it all up.
- */
- stream->in_free = 0;
- return fclose(stream->stdiocast);
- }
- ret = stream->ops->close(stream, preserve_handle ? 0 : 1);
- stream->abstract = NULL;
- /* tidy up any FILE* that might have been fdopened */
- if (release_cast && stream->fclose_stdiocast == PHP_STREAM_FCLOSE_FDOPEN && stream->stdiocast) {
- fclose(stream->stdiocast);
- stream->stdiocast = NULL;
- stream->fclose_stdiocast = PHP_STREAM_FCLOSE_NONE;
- }
- }
- if (close_options & PHP_STREAM_FREE_RELEASE_STREAM) {
- while (stream->readfilters.head) {
- if (stream->readfilters.head->res != NULL) {
- zend_list_close(stream->readfilters.head->res);
- }
- php_stream_filter_remove(stream->readfilters.head, 1);
- }
- while (stream->writefilters.head) {
- if (stream->writefilters.head->res != NULL) {
- zend_list_close(stream->writefilters.head->res);
- }
- php_stream_filter_remove(stream->writefilters.head, 1);
- }
- if (stream->wrapper && stream->wrapper->wops && stream->wrapper->wops->stream_closer) {
- stream->wrapper->wops->stream_closer(stream->wrapper, stream);
- stream->wrapper = NULL;
- }
- if (Z_TYPE(stream->wrapperdata) != IS_UNDEF) {
- zval_ptr_dtor(&stream->wrapperdata);
- ZVAL_UNDEF(&stream->wrapperdata);
- }
- if (stream->readbuf) {
- pefree(stream->readbuf, stream->is_persistent);
- stream->readbuf = NULL;
- }
- if (stream->is_persistent && (close_options & PHP_STREAM_FREE_PERSISTENT)) {
- /* we don't work with *stream but need its value for comparison */
- zend_hash_apply_with_argument(&EG(persistent_list), _php_stream_free_persistent, stream);
- }
- if (stream->orig_path) {
- pefree(stream->orig_path, stream->is_persistent);
- stream->orig_path = NULL;
- }
- pefree(stream, stream->is_persistent);
- }
- if (context) {
- zend_list_delete(context->res);
- }
- return ret;
- }
- /* }}} */
- /* {{{ generic stream operations */
- PHPAPI int _php_stream_fill_read_buffer(php_stream *stream, size_t size)
- {
- /* allocate/fill the buffer */
- if (stream->readfilters.head) {
- char *chunk_buf;
- php_stream_bucket_brigade brig_in = { NULL, NULL }, brig_out = { NULL, NULL };
- php_stream_bucket_brigade *brig_inp = &brig_in, *brig_outp = &brig_out, *brig_swap;
- /* allocate a buffer for reading chunks */
- chunk_buf = emalloc(stream->chunk_size);
- while (!stream->eof && (stream->writepos - stream->readpos < (zend_off_t)size)) {
- ssize_t justread = 0;
- int flags;
- php_stream_bucket *bucket;
- php_stream_filter_status_t status = PSFS_ERR_FATAL;
- php_stream_filter *filter;
- /* read a chunk into a bucket */
- justread = stream->ops->read(stream, chunk_buf, stream->chunk_size);
- if (justread < 0 && stream->writepos == stream->readpos) {
- efree(chunk_buf);
- return FAILURE;
- } else if (justread > 0) {
- bucket = php_stream_bucket_new(stream, chunk_buf, justread, 0, 0);
- /* after this call, bucket is owned by the brigade */
- php_stream_bucket_append(brig_inp, bucket);
- flags = PSFS_FLAG_NORMAL;
- } else {
- flags = stream->eof ? PSFS_FLAG_FLUSH_CLOSE : PSFS_FLAG_FLUSH_INC;
- }
- /* wind the handle... */
- for (filter = stream->readfilters.head; filter; filter = filter->next) {
- status = filter->fops->filter(stream, filter, brig_inp, brig_outp, NULL, flags);
- if (status != PSFS_PASS_ON) {
- break;
- }
- /* brig_out becomes brig_in.
- * brig_in will always be empty here, as the filter MUST attach any un-consumed buckets
- * to its own brigade */
- brig_swap = brig_inp;
- brig_inp = brig_outp;
- brig_outp = brig_swap;
- memset(brig_outp, 0, sizeof(*brig_outp));
- }
- switch (status) {
- case PSFS_PASS_ON:
- /* we get here when the last filter in the chain has data to pass on.
- * in this situation, we are passing the brig_in brigade into the
- * stream read buffer */
- while (brig_inp->head) {
- bucket = brig_inp->head;
- /* reduce buffer memory consumption if possible, to avoid a realloc */
- if (stream->readbuf && stream->readbuflen - stream->writepos < bucket->buflen) {
- if (stream->writepos > stream->readpos) {
- memmove(stream->readbuf, stream->readbuf + stream->readpos, stream->writepos - stream->readpos);
- }
- stream->writepos -= stream->readpos;
- stream->readpos = 0;
- }
- /* grow buffer to hold this bucket */
- if (stream->readbuflen - stream->writepos < bucket->buflen) {
- stream->readbuflen += bucket->buflen;
- stream->readbuf = perealloc(stream->readbuf, stream->readbuflen,
- stream->is_persistent);
- }
- if (bucket->buflen) {
- memcpy(stream->readbuf + stream->writepos, bucket->buf, bucket->buflen);
- }
- stream->writepos += bucket->buflen;
- php_stream_bucket_unlink(bucket);
- php_stream_bucket_delref(bucket);
- }
- break;
- case PSFS_FEED_ME:
- /* when a filter needs feeding, there is no brig_out to deal with.
- * we simply continue the loop; if the caller needs more data,
- * we will read again, otherwise out job is done here */
- break;
- case PSFS_ERR_FATAL:
- /* some fatal error. Theoretically, the stream is borked, so all
- * further reads should fail. */
- stream->eof = 1;
- efree(chunk_buf);
- return FAILURE;
- }
- if (justread <= 0) {
- break;
- }
- }
- efree(chunk_buf);
- return SUCCESS;
- } else {
- /* is there enough data in the buffer ? */
- if (stream->writepos - stream->readpos < (zend_off_t)size) {
- ssize_t justread = 0;
- /* reduce buffer memory consumption if possible, to avoid a realloc */
- if (stream->readbuf && stream->readbuflen - stream->writepos < stream->chunk_size) {
- if (stream->writepos > stream->readpos) {
- memmove(stream->readbuf, stream->readbuf + stream->readpos, stream->writepos - stream->readpos);
- }
- stream->writepos -= stream->readpos;
- stream->readpos = 0;
- }
- /* grow the buffer if required
- * TODO: this can fail for persistent streams */
- if (stream->readbuflen - stream->writepos < stream->chunk_size) {
- stream->readbuflen += stream->chunk_size;
- stream->readbuf = perealloc(stream->readbuf, stream->readbuflen,
- stream->is_persistent);
- }
- justread = stream->ops->read(stream, (char*)stream->readbuf + stream->writepos,
- stream->readbuflen - stream->writepos
- );
- if (justread < 0) {
- return FAILURE;
- }
- stream->writepos += justread;
- }
- return SUCCESS;
- }
- }
- PHPAPI ssize_t _php_stream_read(php_stream *stream, char *buf, size_t size)
- {
- ssize_t toread = 0, didread = 0;
- while (size > 0) {
- /* take from the read buffer first.
- * It is possible that a buffered stream was switched to non-buffered, so we
- * drain the remainder of the buffer before using the "raw" read mode for
- * the excess */
- if (stream->writepos > stream->readpos) {
- toread = stream->writepos - stream->readpos;
- if (toread > size) {
- toread = size;
- }
- memcpy(buf, stream->readbuf + stream->readpos, toread);
- stream->readpos += toread;
- size -= toread;
- buf += toread;
- didread += toread;
- }
- /* ignore eof here; the underlying state might have changed */
- if (size == 0) {
- break;
- }
- if (!stream->readfilters.head && (stream->flags & PHP_STREAM_FLAG_NO_BUFFER || stream->chunk_size == 1)) {
- toread = stream->ops->read(stream, buf, size);
- if (toread < 0) {
- /* Report an error if the read failed and we did not read any data
- * before that. Otherwise return the data we did read. */
- if (didread == 0) {
- return toread;
- }
- break;
- }
- } else {
- if (php_stream_fill_read_buffer(stream, size) != SUCCESS) {
- if (didread == 0) {
- return -1;
- }
- break;
- }
- toread = stream->writepos - stream->readpos;
- if ((size_t) toread > size) {
- toread = size;
- }
- if (toread > 0) {
- memcpy(buf, stream->readbuf + stream->readpos, toread);
- stream->readpos += toread;
- }
- }
- if (toread > 0) {
- didread += toread;
- buf += toread;
- size -= toread;
- } else {
- /* EOF, or temporary end of data (for non-blocking mode). */
- break;
- }
- /* just break anyway, to avoid greedy read for file://, php://memory, and php://temp */
- if ((stream->wrapper != &php_plain_files_wrapper) &&
- (stream->ops != &php_stream_memory_ops) &&
- (stream->ops != &php_stream_temp_ops)) {
- break;
- }
- }
- if (didread > 0) {
- stream->position += didread;
- }
- return didread;
- }
- /* Like php_stream_read(), but reading into a zend_string buffer. This has some similarity
- * to the copy_to_mem() operation, but only performs a single direct read. */
- PHPAPI zend_string *php_stream_read_to_str(php_stream *stream, size_t len)
- {
- zend_string *str = zend_string_alloc(len, 0);
- ssize_t read = php_stream_read(stream, ZSTR_VAL(str), len);
- if (read < 0) {
- zend_string_efree(str);
- return NULL;
- }
- ZSTR_LEN(str) = read;
- ZSTR_VAL(str)[read] = 0;
- if ((size_t) read < len / 2) {
- return zend_string_truncate(str, read, 0);
- }
- return str;
- }
- PHPAPI int _php_stream_eof(php_stream *stream)
- {
- /* if there is data in the buffer, it's not EOF */
- if (stream->writepos - stream->readpos > 0) {
- return 0;
- }
- /* use the configured timeout when checking eof */
- if (!stream->eof && PHP_STREAM_OPTION_RETURN_ERR ==
- php_stream_set_option(stream, PHP_STREAM_OPTION_CHECK_LIVENESS,
- 0, NULL)) {
- stream->eof = 1;
- }
- return stream->eof;
- }
- PHPAPI int _php_stream_putc(php_stream *stream, int c)
- {
- unsigned char buf = c;
- if (php_stream_write(stream, (char*)&buf, 1) > 0) {
- return 1;
- }
- return EOF;
- }
- PHPAPI int _php_stream_getc(php_stream *stream)
- {
- char buf;
- if (php_stream_read(stream, &buf, 1) > 0) {
- return buf & 0xff;
- }
- return EOF;
- }
- PHPAPI int _php_stream_puts(php_stream *stream, const char *buf)
- {
- size_t len;
- char newline[2] = "\n"; /* is this OK for Win? */
- len = strlen(buf);
- if (len > 0 && php_stream_write(stream, buf, len) > 0 && php_stream_write(stream, newline, 1) > 0) {
- return 1;
- }
- return 0;
- }
- PHPAPI int _php_stream_stat(php_stream *stream, php_stream_statbuf *ssb)
- {
- memset(ssb, 0, sizeof(*ssb));
- /* if the stream was wrapped, allow the wrapper to stat it */
- if (stream->wrapper && stream->wrapper->wops->stream_stat != NULL) {
- return stream->wrapper->wops->stream_stat(stream->wrapper, stream, ssb);
- }
- /* if the stream doesn't directly support stat-ing, return with failure.
- * We could try and emulate this by casting to a FD and fstat-ing it,
- * but since the fd might not represent the actual underlying content
- * this would give bogus results. */
- if (stream->ops->stat == NULL) {
- return -1;
- }
- return (stream->ops->stat)(stream, ssb);
- }
- PHPAPI const char *php_stream_locate_eol(php_stream *stream, zend_string *buf)
- {
- size_t avail;
- const char *cr, *lf, *eol = NULL;
- const char *readptr;
- if (!buf) {
- readptr = (char*)stream->readbuf + stream->readpos;
- avail = stream->writepos - stream->readpos;
- } else {
- readptr = ZSTR_VAL(buf);
- avail = ZSTR_LEN(buf);
- }
- /* Look for EOL */
- if (stream->flags & PHP_STREAM_FLAG_DETECT_EOL) {
- cr = memchr(readptr, '\r', avail);
- lf = memchr(readptr, '\n', avail);
- if (cr && lf != cr + 1 && !(lf && lf < cr)) {
- /* mac */
- stream->flags ^= PHP_STREAM_FLAG_DETECT_EOL;
- stream->flags |= PHP_STREAM_FLAG_EOL_MAC;
- eol = cr;
- } else if ((cr && lf && cr == lf - 1) || (lf)) {
- /* dos or unix endings */
- stream->flags ^= PHP_STREAM_FLAG_DETECT_EOL;
- eol = lf;
- }
- } else if (stream->flags & PHP_STREAM_FLAG_EOL_MAC) {
- eol = memchr(readptr, '\r', avail);
- } else {
- /* unix (and dos) line endings */
- eol = memchr(readptr, '\n', avail);
- }
- return eol;
- }
- /* If buf == NULL, the buffer will be allocated automatically and will be of an
- * appropriate length to hold the line, regardless of the line length, memory
- * permitting */
- PHPAPI char *_php_stream_get_line(php_stream *stream, char *buf, size_t maxlen,
- size_t *returned_len)
- {
- size_t avail = 0;
- size_t current_buf_size = 0;
- size_t total_copied = 0;
- int grow_mode = 0;
- char *bufstart = buf;
- if (buf == NULL) {
- grow_mode = 1;
- } else if (maxlen == 0) {
- return NULL;
- }
- /*
- * If the underlying stream operations block when no new data is readable,
- * we need to take extra precautions.
- *
- * If there is buffered data available, we check for a EOL. If it exists,
- * we pass the data immediately back to the caller. This saves a call
- * to the read implementation and will not block where blocking
- * is not necessary at all.
- *
- * If the stream buffer contains more data than the caller requested,
- * we can also avoid that costly step and simply return that data.
- */
- for (;;) {
- avail = stream->writepos - stream->readpos;
- if (avail > 0) {
- size_t cpysz = 0;
- char *readptr;
- const char *eol;
- int done = 0;
- readptr = (char*)stream->readbuf + stream->readpos;
- eol = php_stream_locate_eol(stream, NULL);
- if (eol) {
- cpysz = eol - readptr + 1;
- done = 1;
- } else {
- cpysz = avail;
- }
- if (grow_mode) {
- /* allow room for a NUL. If this realloc is really a realloc
- * (ie: second time around), we get an extra byte. In most
- * cases, with the default chunk size of 8K, we will only
- * incur that overhead once. When people have lines longer
- * than 8K, we waste 1 byte per additional 8K or so.
- * That seems acceptable to me, to avoid making this code
- * hard to follow */
- bufstart = erealloc(bufstart, current_buf_size + cpysz + 1);
- current_buf_size += cpysz + 1;
- buf = bufstart + total_copied;
- } else {
- if (cpysz >= maxlen - 1) {
- cpysz = maxlen - 1;
- done = 1;
- }
- }
- memcpy(buf, readptr, cpysz);
- stream->position += cpysz;
- stream->readpos += cpysz;
- buf += cpysz;
- maxlen -= cpysz;
- total_copied += cpysz;
- if (done) {
- break;
- }
- } else if (stream->eof) {
- break;
- } else {
- /* XXX: Should be fine to always read chunk_size */
- size_t toread;
- if (grow_mode) {
- toread = stream->chunk_size;
- } else {
- toread = maxlen - 1;
- if (toread > stream->chunk_size) {
- toread = stream->chunk_size;
- }
- }
- php_stream_fill_read_buffer(stream, toread);
- if (stream->writepos - stream->readpos == 0) {
- break;
- }
- }
- }
- if (total_copied == 0) {
- if (grow_mode) {
- assert(bufstart == NULL);
- }
- return NULL;
- }
- buf[0] = '\0';
- if (returned_len) {
- *returned_len = total_copied;
- }
- return bufstart;
- }
- #define STREAM_BUFFERED_AMOUNT(stream) \
- ((size_t)(((stream)->writepos) - (stream)->readpos))
- static const char *_php_stream_search_delim(php_stream *stream,
- size_t maxlen,
- size_t skiplen,
- const char *delim, /* non-empty! */
- size_t delim_len)
- {
- size_t seek_len;
- /* set the maximum number of bytes we're allowed to read from buffer */
- seek_len = MIN(STREAM_BUFFERED_AMOUNT(stream), maxlen);
- if (seek_len <= skiplen) {
- return NULL;
- }
- if (delim_len == 1) {
- return memchr(&stream->readbuf[stream->readpos + skiplen],
- delim[0], seek_len - skiplen);
- } else {
- return php_memnstr((char*)&stream->readbuf[stream->readpos + skiplen],
- delim, delim_len,
- (char*)&stream->readbuf[stream->readpos + seek_len]);
- }
- }
- PHPAPI zend_string *php_stream_get_record(php_stream *stream, size_t maxlen, const char *delim, size_t delim_len)
- {
- zend_string *ret_buf; /* returned buffer */
- const char *found_delim = NULL;
- size_t buffered_len,
- tent_ret_len; /* tentative returned length */
- int has_delim = delim_len > 0;
- if (maxlen == 0) {
- return NULL;
- }
- if (has_delim) {
- found_delim = _php_stream_search_delim(
- stream, maxlen, 0, delim, delim_len);
- }
- buffered_len = STREAM_BUFFERED_AMOUNT(stream);
- /* try to read up to maxlen length bytes while we don't find the delim */
- while (!found_delim && buffered_len < maxlen) {
- size_t just_read,
- to_read_now;
- to_read_now = MIN(maxlen - buffered_len, stream->chunk_size);
- php_stream_fill_read_buffer(stream, buffered_len + to_read_now);
- just_read = STREAM_BUFFERED_AMOUNT(stream) - buffered_len;
- /* Assume the stream is temporarily or permanently out of data */
- if (just_read == 0) {
- break;
- }
- if (has_delim) {
- /* search for delimiter, but skip buffered_len (the number of bytes
- * buffered before this loop iteration), as they have already been
- * searched for the delimiter.
- * The left part of the delimiter may still remain in the buffer,
- * so subtract up to <delim_len - 1> from buffered_len, which is
- * the amount of data we skip on this search as an optimization
- */
- found_delim = _php_stream_search_delim(
- stream, maxlen,
- buffered_len >= (delim_len - 1)
- ? buffered_len - (delim_len - 1)
- : 0,
- delim, delim_len);
- if (found_delim) {
- break;
- }
- }
- buffered_len += just_read;
- }
- if (has_delim && found_delim) {
- tent_ret_len = found_delim - (char*)&stream->readbuf[stream->readpos];
- } else if (!has_delim && STREAM_BUFFERED_AMOUNT(stream) >= maxlen) {
- tent_ret_len = maxlen;
- } else {
- /* return with error if the delimiter string (if any) was not found, we
- * could not completely fill the read buffer with maxlen bytes and we
- * don't know we've reached end of file. Added with non-blocking streams
- * in mind, where this situation is frequent */
- if (STREAM_BUFFERED_AMOUNT(stream) < maxlen && !stream->eof) {
- return NULL;
- } else if (STREAM_BUFFERED_AMOUNT(stream) == 0 && stream->eof) {
- /* refuse to return an empty string just because by accident
- * we knew of EOF in a read that returned no data */
- return NULL;
- } else {
- tent_ret_len = MIN(STREAM_BUFFERED_AMOUNT(stream), maxlen);
- }
- }
- ret_buf = zend_string_alloc(tent_ret_len, 0);
- /* php_stream_read will not call ops->read here because the necessary
- * data is guaranteedly buffered */
- ZSTR_LEN(ret_buf) = php_stream_read(stream, ZSTR_VAL(ret_buf), tent_ret_len);
- if (found_delim) {
- stream->readpos += delim_len;
- stream->position += delim_len;
- }
- ZSTR_VAL(ret_buf)[ZSTR_LEN(ret_buf)] = '\0';
- return ret_buf;
- }
- /* Writes a buffer directly to a stream, using multiple of the chunk size */
- static ssize_t _php_stream_write_buffer(php_stream *stream, const char *buf, size_t count)
- {
- ssize_t didwrite = 0;
- /* if we have a seekable stream we need to ensure that data is written at the
- * current stream->position. This means invalidating the read buffer and then
- * performing a low-level seek */
- if (stream->ops->seek && (stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0 && stream->readpos != stream->writepos) {
- stream->readpos = stream->writepos = 0;
- stream->ops->seek(stream, stream->position, SEEK_SET, &stream->position);
- }
- while (count > 0) {
- ssize_t justwrote = stream->ops->write(stream, buf, count);
- if (justwrote <= 0) {
- /* If we already successfully wrote some bytes and a write error occurred
- * later, report the successfully written bytes. */
- if (didwrite == 0) {
- return justwrote;
- }
- return didwrite;
- }
- buf += justwrote;
- count -= justwrote;
- didwrite += justwrote;
- /* Only screw with the buffer if we can seek, otherwise we lose data
- * buffered from fifos and sockets */
- if (stream->ops->seek && (stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0) {
- stream->position += justwrote;
- }
- }
- return didwrite;
- }
- /* push some data through the write filter chain.
- * buf may be NULL, if flags are set to indicate a flush.
- * This may trigger a real write to the stream.
- * Returns the number of bytes consumed from buf by the first filter in the chain.
- * */
- static ssize_t _php_stream_write_filtered(php_stream *stream, const char *buf, size_t count, int flags)
- {
- size_t consumed = 0;
- php_stream_bucket *bucket;
- php_stream_bucket_brigade brig_in = { NULL, NULL }, brig_out = { NULL, NULL };
- php_stream_bucket_brigade *brig_inp = &brig_in, *brig_outp = &brig_out, *brig_swap;
- php_stream_filter_status_t status = PSFS_ERR_FATAL;
- php_stream_filter *filter;
- if (buf) {
- bucket = php_stream_bucket_new(stream, (char *)buf, count, 0, 0);
- php_stream_bucket_append(&brig_in, bucket);
- }
- for (filter = stream->writefilters.head; filter; filter = filter->next) {
- /* for our return value, we are interested in the number of bytes consumed from
- * the first filter in the chain */
- status = filter->fops->filter(stream, filter, brig_inp, brig_outp,
- filter == stream->writefilters.head ? &consumed : NULL, flags);
- if (status != PSFS_PASS_ON) {
- break;
- }
- /* brig_out becomes brig_in.
- * brig_in will always be empty here, as the filter MUST attach any un-consumed buckets
- * to its own brigade */
- brig_swap = brig_inp;
- brig_inp = brig_outp;
- brig_outp = brig_swap;
- memset(brig_outp, 0, sizeof(*brig_outp));
- }
- switch (status) {
- case PSFS_PASS_ON:
- /* filter chain generated some output; push it through to the
- * underlying stream */
- while (brig_inp->head) {
- bucket = brig_inp->head;
- if (_php_stream_write_buffer(stream, bucket->buf, bucket->buflen) < 0) {
- consumed = (ssize_t) -1;
- }
- /* Potential error situation - eg: no space on device. Perhaps we should keep this brigade
- * hanging around and try to write it later.
- * At the moment, we just drop it on the floor
- * */
- php_stream_bucket_unlink(bucket);
- php_stream_bucket_delref(bucket);
- }
- break;
- case PSFS_FEED_ME:
- /* need more data before we can push data through to the stream */
- break;
- case PSFS_ERR_FATAL:
- /* some fatal error. Theoretically, the stream is borked, so all
- * further writes should fail. */
- return (ssize_t) -1;
- }
- return consumed;
- }
- PHPAPI int _php_stream_flush(php_stream *stream, int closing)
- {
- int ret = 0;
- if (stream->writefilters.head) {
- _php_stream_write_filtered(stream, NULL, 0, closing ? PSFS_FLAG_FLUSH_CLOSE : PSFS_FLAG_FLUSH_INC );
- }
- stream->flags &= ~PHP_STREAM_FLAG_WAS_WRITTEN;
- if (stream->ops->flush) {
- ret = stream->ops->flush(stream);
- }
- return ret;
- }
- PHPAPI ssize_t _php_stream_write(php_stream *stream, const char *buf, size_t count)
- {
- ssize_t bytes;
- if (count == 0) {
- return 0;
- }
- ZEND_ASSERT(buf != NULL);
- if (stream->ops->write == NULL) {
- php_error_docref(NULL, E_NOTICE, "Stream is not writable");
- return (ssize_t) -1;
- }
- if (stream->writefilters.head) {
- bytes = _php_stream_write_filtered(stream, buf, count, PSFS_FLAG_NORMAL);
- } else {
- bytes = _php_stream_write_buffer(stream, buf, count);
- }
- if (bytes) {
- stream->flags |= PHP_STREAM_FLAG_WAS_WRITTEN;
- }
- return bytes;
- }
- PHPAPI ssize_t _php_stream_printf(php_stream *stream, const char *fmt, ...)
- {
- ssize_t count;
- char *buf;
- va_list ap;
- va_start(ap, fmt);
- count = vspprintf(&buf, 0, fmt, ap);
- va_end(ap);
- if (!buf) {
- return -1; /* error condition */
- }
- count = php_stream_write(stream, buf, count);
- efree(buf);
- return count;
- }
- PHPAPI zend_off_t _php_stream_tell(php_stream *stream)
- {
- return stream->position;
- }
- PHPAPI int _php_stream_seek(php_stream *stream, zend_off_t offset, int whence)
- {
- if (stream->fclose_stdiocast == PHP_STREAM_FCLOSE_FOPENCOOKIE) {
- /* flush to commit data written to the fopencookie FILE* */
- fflush(stream->stdiocast);
- }
- /* handle the case where we are in the buffer */
- if ((stream->flags & PHP_STREAM_FLAG_NO_BUFFER) == 0) {
- switch(whence) {
- case SEEK_CUR:
- if (offset > 0 && offset <= stream->writepos - stream->readpos) {
- stream->readpos += offset; /* if offset = ..., then readpos = writepos */
- stream->position += offset;
- stream->eof = 0;
- return 0;
- }
- break;
- case SEEK_SET:
- if (offset > stream->position &&
- offset <= stream->position + stream->writepos - stream->readpos) {
- stream->readpos += offset - stream->position;
- stream->position = offset;
- stream->eof = 0;
- return 0;
- }
- break;
- }
- }
- if (stream->ops->seek && (stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0) {
- int ret;
- if (stream->writefilters.head) {
- _php_stream_flush(stream, 0);
- }
- switch(whence) {
- case SEEK_CUR:
- offset = stream->position + offset;
- whence = SEEK_SET;
- break;
- }
- ret = stream->ops->seek(stream, offset, whence, &stream->position);
- if (((stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0) || ret == 0) {
- if (ret == 0) {
- stream->eof = 0;
- }
- /* invalidate the buffer contents */
- stream->readpos = stream->writepos = 0;
- return ret;
- }
- /* else the stream has decided that it can't support seeking after all;
- * fall through to attempt emulation */
- }
- /* emulate forward moving seeks with reads */
- if (whence == SEEK_CUR && offset >= 0) {
- char tmp[1024];
- ssize_t didread;
- while (offset > 0) {
- if ((didread = php_stream_read(stream, tmp, MIN(offset, sizeof(tmp)))) <= 0) {
- return -1;
- }
- offset -= didread;
- }
- stream->eof = 0;
- return 0;
- }
- php_error_docref(NULL, E_WARNING, "Stream does not support seeking");
- return -1;
- }
- PHPAPI int _php_stream_set_option(php_stream *stream, int option, int value, void *ptrparam)
- {
- int ret = PHP_STREAM_OPTION_RETURN_NOTIMPL;
- if (stream->ops->set_option) {
- ret = stream->ops->set_option(stream, option, value, ptrparam);
- }
- if (ret == PHP_STREAM_OPTION_RETURN_NOTIMPL) {
- switch(option) {
- case PHP_STREAM_OPTION_SET_CHUNK_SIZE:
- /* XXX chunk size itself is of size_t, that might be ok or not for a particular case*/
- ret = stream->chunk_size > INT_MAX ? INT_MAX : (int)stream->chunk_size;
- stream->chunk_size = value;
- return ret;
- case PHP_STREAM_OPTION_READ_BUFFER:
- /* try to match the buffer mode as best we can */
- if (value == PHP_STREAM_BUFFER_NONE) {
- stream->flags |= PHP_STREAM_FLAG_NO_BUFFER;
- } else if (stream->flags & PHP_STREAM_FLAG_NO_BUFFER) {
- stream->flags ^= PHP_STREAM_FLAG_NO_BUFFER;
- }
- ret = PHP_STREAM_OPTION_RETURN_OK;
- break;
- default:
- ;
- }
- }
- return ret;
- }
- PHPAPI int _php_stream_truncate_set_size(php_stream *stream, size_t newsize)
- {
- return php_stream_set_option(stream, PHP_STREAM_OPTION_TRUNCATE_API, PHP_STREAM_TRUNCATE_SET_SIZE, &newsize);
- }
- PHPAPI ssize_t _php_stream_passthru(php_stream * stream STREAMS_DC)
- {
- size_t bcount = 0;
- char buf[8192];
- ssize_t b;
- if (php_stream_mmap_possible(stream)) {
- char *p;
- size_t mapped;
- p = php_stream_mmap_range(stream, php_stream_tell(stream), PHP_STREAM_MMAP_ALL, PHP_STREAM_MAP_MODE_SHARED_READONLY, &mapped);
- if (p) {
- do {
- /* output functions return int, so pass in int max */
- if (0 < (b = PHPWRITE(p + bcount, MIN(mapped - bcount, INT_MAX)))) {
- bcount += b;
- }
- } while (b > 0 && mapped > bcount);
- php_stream_mmap_unmap_ex(stream, mapped);
- return bcount;
- }
- }
- while ((b = php_stream_read(stream, buf, sizeof(buf))) > 0) {
- PHPWRITE(buf, b);
- bcount += b;
- }
- if (b < 0 && bcount == 0) {
- return b;
- }
- return bcount;
- }
- PHPAPI zend_string *_php_stream_copy_to_mem(php_stream *src, size_t maxlen, int persistent STREAMS_DC)
- {
- ssize_t ret = 0;
- char *ptr;
- size_t len = 0, max_len;
- int step = CHUNK_SIZE;
- int min_room = CHUNK_SIZE / 4;
- php_stream_statbuf ssbuf;
- zend_string *result;
- if (maxlen == 0) {
- return ZSTR_EMPTY_ALLOC();
- }
- if (maxlen == PHP_STREAM_COPY_ALL) {
- maxlen = 0;
- }
- if (maxlen > 0) {
- result = zend_string_alloc(maxlen, persistent);
- ptr = ZSTR_VAL(result);
- while ((len < maxlen) && !php_stream_eof(src)) {
- ret = php_stream_read(src, ptr, maxlen - len);
- if (ret <= 0) {
- // TODO: Propagate error?
- break;
- }
- len += ret;
- ptr += ret;
- }
- if (len) {
- ZSTR_LEN(result) = len;
- ZSTR_VAL(result)[len] = '\0';
- /* Only truncate if the savings are large enough */
- if (len < maxlen / 2) {
- result = zend_string_truncate(result, len, persistent);
- }
- } else {
- zend_string_free(result);
- result = NULL;
- }
- return result;
- }
- /* avoid many reallocs by allocating a good sized chunk to begin with, if
- * we can. Note that the stream may be filtered, in which case the stat
- * result may be inaccurate, as the filter may inflate or deflate the
- * number of bytes that we can read. In order to avoid an upsize followed
- * by a downsize of the buffer, overestimate by the step size (which is
- * 2K). */
- if (php_stream_stat(src, &ssbuf) == 0 && ssbuf.sb.st_size > 0) {
- max_len = ssbuf.sb.st_size + step;
- } else {
- max_len = step;
- }
- result = zend_string_alloc(max_len, persistent);
- ptr = ZSTR_VAL(result);
- // TODO: Propagate error?
- while ((ret = php_stream_read(src, ptr, max_len - len)) > 0){
- len += ret;
- if (len + min_room >= max_len) {
- result = zend_string_extend(result, max_len + step, persistent);
- max_len += step;
- ptr = ZSTR_VAL(result) + len;
- } else {
- ptr += ret;
- }
- }
- if (len) {
- result = zend_string_truncate(result, len, persistent);
- ZSTR_VAL(result)[len] = '\0';
- } else {
- zend_string_free(result);
- result = NULL;
- }
- return result;
- }
- /* Returns SUCCESS/FAILURE and sets *len to the number of bytes moved */
- PHPAPI int _php_stream_copy_to_stream_ex(php_stream *src, php_stream *dest, size_t maxlen, size_t *len STREAMS_DC)
- {
- char buf[CHUNK_SIZE];
- size_t haveread = 0;
- size_t towrite;
- size_t dummy;
- php_stream_statbuf ssbuf;
- if (!len) {
- len = &dummy;
- }
- if (maxlen == 0) {
- *len = 0;
- return SUCCESS;
- }
- if (maxlen == PHP_STREAM_COPY_ALL) {
- maxlen = 0;
- }
- if (php_stream_stat(src, &ssbuf) == 0) {
- if (ssbuf.sb.st_size == 0
- #ifdef S_ISREG
- && S_ISREG(ssbuf.sb.st_mode)
- #endif
- ) {
- *len = 0;
- return SUCCESS;
- }
- }
- if (php_stream_mmap_possible(src)) {
- char *p;
- size_t mapped;
- p = php_stream_mmap_range(src, php_stream_tell(src), maxlen, PHP_STREAM_MAP_MODE_SHARED_READONLY, &mapped);
- if (p) {
- ssize_t didwrite = php_stream_write(dest, p, mapped);
- if (didwrite < 0) {
- *len = 0;
- return FAILURE;
- }
- php_stream_mmap_unmap_ex(src, mapped);
- *len = didwrite;
- /* we've got at least 1 byte to read
- * less than 1 is an error
- * AND read bytes match written */
- if (mapped > 0 && mapped == didwrite) {
- return SUCCESS;
- }
- return FAILURE;
- }
- }
- while(1) {
- size_t readchunk = sizeof(buf);
- ssize_t didread;
- char *writeptr;
- if (maxlen && (maxlen - haveread) < readchunk) {
- readchunk = maxlen - haveread;
- }
- didread = php_stream_read(src, buf, readchunk);
- if (didread <= 0) {
- *len = haveread;
- return didread < 0 ? FAILURE : SUCCESS;
- }
- towrite = didread;
- writeptr = buf;
- haveread += didread;
- while (towrite) {
- ssize_t didwrite = php_stream_write(dest, writeptr, towrite);
- if (didwrite <= 0) {
- *len = haveread - (didread - towrite);
- return FAILURE;
- }
- towrite -= didwrite;
- writeptr += didwrite;
- }
- if (maxlen - haveread == 0) {
- break;
- }
- }
- *len = haveread;
- /* we've got at least 1 byte to read.
- * less than 1 is an error */
- if (haveread > 0 || src->eof) {
- return SUCCESS;
- }
- return FAILURE;
- }
- /* Returns the number of bytes moved.
- * Returns 1 when source len is 0.
- * Deprecated in favor of php_stream_copy_to_stream_ex() */
- ZEND_ATTRIBUTE_DEPRECATED
- PHPAPI size_t _php_stream_copy_to_stream(php_stream *src, php_stream *dest, size_t maxlen STREAMS_DC)
- {
- size_t len;
- int ret = _php_stream_copy_to_stream_ex(src, dest, maxlen, &len STREAMS_REL_CC);
- if (ret == SUCCESS && len == 0 && maxlen != 0) {
- return 1;
- }
- return len;
- }
- /* }}} */
- /* {{{ wrapper init and registration */
- static void stream_resource_regular_dtor(zend_resource *rsrc)
- {
- php_stream *stream = (php_stream*)rsrc->ptr;
- /* set the return value for pclose */
- FG(pclose_ret) = php_stream_free(stream, PHP_STREAM_FREE_CLOSE | PHP_STREAM_FREE_RSRC_DTOR);
- }
- static void stream_resource_persistent_dtor(zend_resource *rsrc)
- {
- php_stream *stream = (php_stream*)rsrc->ptr;
- FG(pclose_ret) = php_stream_free(stream, PHP_STREAM_FREE_CLOSE | PHP_STREAM_FREE_RSRC_DTOR);
- }
- void php_shutdown_stream_hashes(void)
- {
- if (FG(stream_wrappers)) {
- zend_hash_destroy(FG(stream_wrappers));
- efree(FG(stream_wrappers));
- FG(stream_wrappers) = NULL;
- }
- if (FG(stream_filters)) {
- zend_hash_destroy(FG(stream_filters));
- efree(FG(stream_filters));
- FG(stream_filters) = NULL;
- }
- if (FG(wrapper_errors)) {
- zend_hash_destroy(FG(wrapper_errors));
- efree(FG(wrapper_errors));
- FG(wrapper_errors) = NULL;
- }
- }
- int php_init_stream_wrappers(int module_number)
- {
- le_stream = zend_register_list_destructors_ex(stream_resource_regular_dtor, NULL, "stream", module_number);
- le_pstream = zend_register_list_destructors_ex(NULL, stream_resource_persistent_dtor, "persistent stream", module_number);
- /* Filters are cleaned up by the streams they're attached to */
- le_stream_filter = zend_register_list_destructors_ex(NULL, NULL, "stream filter", module_number);
- zend_hash_init(&url_stream_wrappers_hash, 8, NULL, NULL, 1);
- zend_hash_init(php_get_stream_filters_hash_global(), 8, NULL, NULL, 1);
- zend_hash_init(php_stream_xport_get_hash(), 8, NULL, NULL, 1);
- return (php_stream_xport_register("tcp", php_stream_generic_socket_factory) == SUCCESS
- &&
- php_stream_xport_register("udp", php_stream_generic_socket_factory) == SUCCESS
- #if defined(AF_UNIX) && !(defined(PHP_WIN32) || defined(__riscos__))
- &&
- php_stream_xport_register("unix", php_stream_generic_socket_factory) == SUCCESS
- &&
- php_stream_xport_register("udg", php_stream_generic_socket_factory) == SUCCESS
- #endif
- ) ? SUCCESS : FAILURE;
- }
- int php_shutdown_stream_wrappers(int module_number)
- {
- zend_hash_destroy(&url_stream_wrappers_hash);
- zend_hash_destroy(php_get_stream_filters_hash_global());
- zend_hash_destroy(php_stream_xport_get_hash());
- return SUCCESS;
- }
- /* Validate protocol scheme names during registration
- * Must conform to /^[a-zA-Z0-9+.-]+$/
- */
- static inline int php_stream_wrapper_scheme_validate(const char *protocol, unsigned int protocol_len)
- {
- unsigned int i;
- for(i = 0; i < protocol_len; i++) {
- if (!isalnum((int)protocol[i]) &&
- protocol[i] != '+' &&
- protocol[i] != '-' &&
- protocol[i] != '.') {
- return FAILURE;
- }
- }
- return SUCCESS;
- }
- /* API for registering GLOBAL wrappers */
- PHPAPI int php_register_url_stream_wrapper(const char *protocol, const php_stream_wrapper *wrapper)
- {
- unsigned int protocol_len = (unsigned int)strlen(protocol);
- int ret;
- zend_string *str;
- if (php_stream_wrapper_scheme_validate(protocol, protocol_len) == FAILURE) {
- return FAILURE;
- }
- str = zend_string_init_interned(protocol, protocol_len, 1);
- ret = zend_hash_add_ptr(&url_stream_wrappers_hash, str, (void*)wrapper) ? SUCCESS : FAILURE;
- zend_string_release_ex(str, 1);
- return ret;
- }
- PHPAPI int php_unregister_url_stream_wrapper(const char *protocol)
- {
- return zend_hash_str_del(&url_stream_wrappers_hash, protocol, strlen(protocol));
- }
- static void clone_wrapper_hash(void)
- {
- ALLOC_HASHTABLE(FG(stream_wrappers));
- zend_hash_init(FG(stream_wrappers), zend_hash_num_elements(&url_stream_wrappers_hash), NULL, NULL, 0);
- zend_hash_copy(FG(stream_wrappers), &url_stream_wrappers_hash, NULL);
- }
- /* API for registering VOLATILE wrappers */
- PHPAPI int php_register_url_stream_wrapper_volatile(zend_string *protocol, php_stream_wrapper *wrapper)
- {
- if (php_stream_wrapper_scheme_validate(ZSTR_VAL(protocol), ZSTR_LEN(protocol)) == FAILURE) {
- return FAILURE;
- }
- if (!FG(stream_wrappers)) {
- clone_wrapper_hash();
- }
- return zend_hash_add_ptr(FG(stream_wrappers), protocol, wrapper) ? SUCCESS : FAILURE;
- }
- PHPAPI int php_unregister_url_stream_wrapper_volatile(zend_string *protocol)
- {
- if (!FG(stream_wrappers)) {
- clone_wrapper_hash();
- }
- return zend_hash_del(FG(stream_wrappers), protocol);
- }
- /* }}} */
- /* {{{ php_stream_locate_url_wrapper */
- PHP…
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