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473 lines
10 KiB
C
473 lines
10 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 4 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2003 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.02 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available at through the world-wide-web at |
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| http://www.php.net/license/2_02.txt. |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Author: |
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| Marcus Boerger <helly@php.net> |
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+----------------------------------------------------------------------+
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*/
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#define _GNU_SOURCE
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#include "php.h"
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/* Memory streams use a dynamic memory buffer to emulate a stream.
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* You can use php_stream_memory_open to create a readonly stream
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* from an existing memory buffer.
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*/
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/* Temp streams are streams that uses memory streams as long their
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* size is less than a given memory amount. When a write operation
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* exceeds that limit the content is written to a temporary file.
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*/
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/* {{{ ------- MEMORY stream implementation -------*/
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typedef struct {
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char *data;
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size_t fpos;
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size_t fsize;
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size_t smax;
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int mode;
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} php_stream_memory_data;
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/* {{{ */
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static size_t php_stream_memory_write(php_stream *stream, const char *buf, size_t count TSRMLS_DC)
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{
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php_stream_memory_data *ms;
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assert(stream != NULL);
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ms = stream->abstract;
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assert(ms != NULL);
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if (ms->mode & TEMP_STREAM_READONLY) {
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return 0;
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}
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if (ms->fpos + count > ms->fsize) {
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char *tmp;
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if (!ms->data) {
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tmp = emalloc(ms->fpos + count);
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} else {
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tmp = erealloc(ms->data, ms->fpos + count);
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}
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if (!tmp) {
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count = ms->fsize - ms->fpos + 1;
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} else {
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ms->data = tmp;
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ms->fsize = ms->fpos + count;
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}
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}
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if (!ms->data)
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count = 0;
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if (count) {
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assert(buf!= NULL);
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memcpy(ms->data+ms->fpos, (char*)buf, count);
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ms->fpos += count;
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}
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return count;
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}
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/* }}} */
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/* {{{ */
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static size_t php_stream_memory_read(php_stream *stream, char *buf, size_t count TSRMLS_DC)
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{
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php_stream_memory_data *ms;
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assert(stream != NULL);
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ms = stream->abstract;
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assert(ms != NULL);
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if (ms->fpos + count > ms->fsize) {
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count = ms->fsize - ms->fpos;
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}
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if (count) {
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assert(ms->data!= NULL);
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assert(buf!= NULL);
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memcpy(buf, ms->data+ms->fpos, count);
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ms->fpos += count;
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} else {
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stream->eof = 1;
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}
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return count;
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}
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/* }}} */
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/* {{{ */
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static int php_stream_memory_close(php_stream *stream, int close_handle TSRMLS_DC)
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{
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php_stream_memory_data *ms;
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assert(stream != NULL);
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ms = stream->abstract;
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assert(ms != NULL);
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if (ms->data && close_handle && ms->mode != TEMP_STREAM_READONLY) {
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efree(ms->data);
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}
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efree(ms);
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return 0;
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}
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/* }}} */
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/* {{{ */
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static int php_stream_memory_flush(php_stream *stream TSRMLS_DC)
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{
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/* nothing to do here */
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return 0;
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}
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/* }}} */
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/* {{{ */
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static int php_stream_memory_seek(php_stream *stream, off_t offset, int whence, off_t *newoffs TSRMLS_DC)
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{
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php_stream_memory_data *ms;
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assert(stream != NULL);
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ms = stream->abstract;
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assert(ms != NULL);
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switch(whence) {
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case SEEK_CUR:
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if (offset < 0) {
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if (ms->fpos < (size_t)(-offset)) {
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ms->fpos = 0;
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/*return EINVAL;*/
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} else {
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ms->fpos = ms->fpos + offset;
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}
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} else {
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if (ms->fpos < (size_t)(offset)) {
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ms->fpos = ms->fsize;
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/*return EINVAL;*/
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} else {
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ms->fpos = ms->fpos + offset;
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}
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}
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*newoffs = ms->fpos;
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return 0;
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case SEEK_SET:
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if (ms->fsize < (size_t)(offset)) {
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ms->fpos = ms->fsize;
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/*return EINVAL;*/
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} else {
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ms->fpos = offset;
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}
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*newoffs = ms->fpos;
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return 0;
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case SEEK_END:
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if (offset > 0) {
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ms->fpos = ms->fsize;
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/*return EINVAL;*/
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} else if (ms->fpos < (size_t)(-offset)) {
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ms->fpos = 0;
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/*return EINVAL;*/
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} else {
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ms->fpos = ms->fsize + offset;
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}
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*newoffs = ms->fpos;
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return 0;
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default:
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return 0;
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/*return EINVAL;*/
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}
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}
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/* }}} */
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/* {{{ */
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static int php_stream_memory_cast(php_stream *stream, int castas, void **ret TSRMLS_DC)
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{
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return FAILURE;
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}
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/* }}} */
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php_stream_ops php_stream_memory_ops = {
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php_stream_memory_write, php_stream_memory_read,
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php_stream_memory_close, php_stream_memory_flush,
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"MEMORY",
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php_stream_memory_seek,
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php_stream_memory_cast,
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NULL, /* stat */
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NULL /* set_option */
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};
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/* {{{ */
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PHPAPI php_stream *_php_stream_memory_create(int mode STREAMS_DC TSRMLS_DC)
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{
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php_stream_memory_data *self;
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php_stream *stream;
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self = emalloc(sizeof(*self));
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assert(self != NULL);
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self->data = NULL;
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self->fpos = 0;
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self->fsize = 0;
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self->smax = -1;
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self->mode = mode;
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stream = php_stream_alloc(&php_stream_memory_ops, self, 0, "r+b");
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stream->flags |= PHP_STREAM_FLAG_NO_BUFFER;
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return stream;
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}
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/* }}} */
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/* {{{ */
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PHPAPI php_stream *_php_stream_memory_open(int mode, char *buf, size_t length STREAMS_DC TSRMLS_DC)
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{
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php_stream *stream;
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php_stream_memory_data *ms;
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if ((stream = php_stream_memory_create_rel(mode)) != NULL) {
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ms = stream->abstract;
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if (mode == TEMP_STREAM_READONLY) {
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/* use the buffer directly */
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ms->data = buf;
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ms->fsize = length;
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} else {
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if (length) {
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assert(buf != NULL);
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php_stream_write(stream, buf, length);
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}
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}
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}
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return stream;
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}
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/* }}} */
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/* {{{ */
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PHPAPI char *_php_stream_memory_get_buffer(php_stream *stream, size_t *length STREAMS_DC TSRMLS_DC)
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{
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php_stream_memory_data *ms;
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assert(stream != NULL);
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ms = stream->abstract;
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assert(ms != NULL);
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assert(length != 0);
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*length = ms->fsize;
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return ms->data;
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}
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/* }}} */
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/* }}} */
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/* {{{ ------- TEMP stream implementation -------*/
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typedef struct {
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php_stream *innerstream;
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size_t smax;
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int mode;
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} php_stream_temp_data;
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/* {{{ */
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static size_t php_stream_temp_write(php_stream *stream, const char *buf, size_t count TSRMLS_DC)
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{
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php_stream_temp_data *ts;
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assert(stream != NULL);
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ts = stream->abstract;
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assert(ts != NULL);
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if (php_stream_is(ts->innerstream, PHP_STREAM_IS_MEMORY)) {
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size_t memsize;
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char *membuf = php_stream_memory_get_buffer(ts->innerstream, &memsize);
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if (memsize + count >= ts->smax) {
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php_stream *file = php_stream_fopen_tmpfile();
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php_stream_write(file, membuf, memsize);
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php_stream_close(ts->innerstream);
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ts->innerstream = file;
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}
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}
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return php_stream_write(ts->innerstream, buf, count);
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}
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/* }}} */
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/* {{{ */
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static size_t php_stream_temp_read(php_stream *stream, char *buf, size_t count TSRMLS_DC)
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{
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php_stream_temp_data *ts;
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assert(stream != NULL);
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ts = stream->abstract;
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assert(ts != NULL);
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return php_stream_read(ts->innerstream, buf, count);
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}
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/* }}} */
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/* {{{ */
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static int php_stream_temp_close(php_stream *stream, int close_handle TSRMLS_DC)
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{
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php_stream_temp_data *ts;
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int ret;
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assert(stream != NULL);
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ts = stream->abstract;
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assert(ts != NULL);
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ret = php_stream_free(ts->innerstream, PHP_STREAM_FREE_CLOSE | (close_handle ? 0 : PHP_STREAM_FREE_PRESERVE_HANDLE));
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efree(ts);
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return ret;
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}
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/* }}} */
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/* {{{ */
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static int php_stream_temp_flush(php_stream *stream TSRMLS_DC)
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{
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php_stream_temp_data *ts;
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assert(stream != NULL);
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ts = stream->abstract;
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assert(ts != NULL);
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return php_stream_flush(ts->innerstream);
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}
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/* }}} */
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/* {{{ */
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static int php_stream_temp_seek(php_stream *stream, off_t offset, int whence, off_t *newoffs TSRMLS_DC)
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{
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php_stream_temp_data *ts;
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int ret;
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assert(stream != NULL);
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ts = stream->abstract;
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assert(ts != NULL);
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ret = php_stream_seek(ts->innerstream, offset, whence);
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*newoffs = php_stream_tell(ts->innerstream);
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return ret;
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}
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/* }}} */
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/* {{{ */
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static int php_stream_temp_cast(php_stream *stream, int castas, void **ret TSRMLS_DC)
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{
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php_stream_temp_data *ts;
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php_stream *file;
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size_t memsize;
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char *membuf;
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off_t pos;
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assert(stream != NULL);
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ts = stream->abstract;
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assert(ts != NULL);
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if (php_stream_is(ts->innerstream, PHP_STREAM_IS_STDIO)) {
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return php_stream_cast(ts->innerstream, castas, ret, 0);
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}
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/* we are still using a memory based backing. If they are if we can be
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* a FILE*, say yes because we can perform the conversion.
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* If they actually want to perform the conversion, we need to switch
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* the memory stream to a tmpfile stream */
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if (ret == NULL && castas == PHP_STREAM_AS_STDIO) {
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return SUCCESS;
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}
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/* say "no" to other stream forms */
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if (ret == NULL) {
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return FAILURE;
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}
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/* perform the conversion and then pass the request on to the innerstream */
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membuf = php_stream_memory_get_buffer(ts->innerstream, &memsize);
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file = php_stream_fopen_tmpfile();
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php_stream_write(file, membuf, memsize);
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pos = php_stream_tell(ts->innerstream);
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php_stream_close(ts->innerstream);
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ts->innerstream = file;
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php_stream_seek(ts->innerstream, pos, SEEK_SET);
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return php_stream_cast(ts->innerstream, castas, ret, 1);
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}
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/* }}} */
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php_stream_ops php_stream_temp_ops = {
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php_stream_temp_write, php_stream_temp_read,
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php_stream_temp_close, php_stream_temp_flush,
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"TEMP",
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php_stream_temp_seek,
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php_stream_temp_cast,
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NULL, /* stat */
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NULL /* set_option */
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};
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/* {{{ */
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PHPAPI php_stream *_php_stream_temp_create(int mode, size_t max_memory_usage STREAMS_DC TSRMLS_DC)
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{
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php_stream_temp_data *self;
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php_stream *stream;
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self = ecalloc(1, sizeof(*self));
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assert(self != NULL);
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self->smax = max_memory_usage;
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self->mode = mode;
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stream = php_stream_alloc(&php_stream_temp_ops, self, 0, "r+b");
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stream->flags |= PHP_STREAM_FLAG_NO_BUFFER;
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self->innerstream = php_stream_memory_create(mode);
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return stream;
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}
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/* }}} */
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/* {{{ */
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PHPAPI php_stream *_php_stream_temp_open(int mode, size_t max_memory_usage, char *buf, size_t length STREAMS_DC TSRMLS_DC)
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{
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php_stream *stream;
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php_stream_temp_data *ms;
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if ((stream = php_stream_temp_create_rel(mode & ~TEMP_STREAM_READONLY, max_memory_usage)) != NULL) {
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if (length) {
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assert(buf != NULL);
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php_stream_temp_write(stream, buf, length TSRMLS_CC);
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}
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ms = stream->abstract;
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assert(ms != NULL);
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ms->mode = mode;
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}
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return stream;
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}
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/* }}} */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: noet sw=4 ts=4 fdm=marker
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* vim<600: noet sw=4 ts=4
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*/
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