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streams.c
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streams.c
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/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| 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(mmap_file) (not strictly required) */
#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 || stream->writefilters.head) {
/* 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) {
size_t to_read_now = MIN(size, stream->chunk_size);
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)to_read_now)) {
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 = stream->eof ? PSFS_FLAG_FLUSH_CLOSE : 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;