add an open mode for the memory streams that allows the stream to take

ownership of the passed-in buffer

Author: wez

main/php_memory_streams.h

@@ -27,6 +27,7 @@
 
 #define TEMP_STREAM_DEFAULT  0
 #define TEMP_STREAM_READONLY 1
+#define TEMP_STREAM_TAKE_BUFFER 2
 
 #define php_stream_memory_create(mode) _php_stream_memory_create((mode) STREAMS_CC TSRMLS_CC)
 #define php_stream_memory_create_rel(mode) _php_stream_memory_create((mode) STREAMS_REL_CC TSRMLS_CC)

main/streams/memory.c

@@ -237,7 +237,7 @@ PHPAPI php_stream *_php_stream_memory_open(int mode, char *buf, size_t length ST
 	if ((stream = php_stream_memory_create_rel(mode)) != NULL) {
 		ms = stream->abstract;
 
-		if (mode == TEMP_STREAM_READONLY) {
+		if (mode == TEMP_STREAM_READONLY || mode == TEMP_STREAM_TAKE_BUFFER) {
 			/* use the buffer directly */
 			ms->data = buf;
 			ms->fsize = length;