libwebp: add WebPDemux stub functions
beginning of a separate interface to demux webp files.
Change-Id: If8bf9c43defe5f6c8678afd03541f7cd8261c99a
diff --git a/src/mux/demux.c b/src/mux/demux.c
new file mode 100644
index 0000000..3a644f8
--- /dev/null
+++ b/src/mux/demux.c
@@ -0,0 +1,33 @@
+// Copyright 2012 Google Inc. All Rights Reserved.
+//
+// This code is licensed under the same terms as WebM:
+// Software License Agreement: http://www.webmproject.org/license/software/
+// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
+// -----------------------------------------------------------------------------
+//
+// WebP container demux.
+//
+
+#include "../webp/mux.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+WebPDemuxer* WebPDemuxInternal(
+ const WebPData* const data, int allow_partial,
+ WebPDemuxState* const state, int version) {
+ (void)data;
+ (void)allow_partial;
+ (void)state;
+ (void)version;
+ return NULL;
+}
+
+void WebPDemuxDelete(WebPDemuxer* const dmux) {
+ (void)dmux;
+}
+
+#if defined(__cplusplus) || defined(c_plusplus)
+} // extern "C"
+#endif
diff --git a/src/webp/mux.h b/src/webp/mux.h
index a8bd4f5..106756b 100644
--- a/src/webp/mux.h
+++ b/src/webp/mux.h
@@ -464,6 +464,45 @@
WebPData* const assembled_data);
//------------------------------------------------------------------------------
+// Demux API.
+// Enables extraction of image and extended format data from WebP files.
+
+#define WEBP_DEMUX_ABI_VERSION 0x0000
+
+typedef struct WebPDemuxer WebPDemuxer;
+
+typedef enum {
+ WEBP_DEMUX_PARSING_HEADER, // Not enough data to parse full header.
+ WEBP_DEMUX_PARSED_HEADER, // Header parsing complete, data may be available.
+ WEBP_DEMUX_DONE // Entire file has been parsed.
+} WebPDemuxState;
+
+//------------------------------------------------------------------------------
+// Life of a Demux object
+
+// Internal, version-checked, entry point
+WEBP_EXTERN(WebPDemuxer*) WebPDemuxInternal(
+ const WebPData* const, int, WebPDemuxState* const, int);
+
+// Parses the WebP file given by 'data'.
+// A complete WebP file must be present in 'data' for the function to succeed.
+// Returns a WebPDemuxer object on successful parse, NULL otherwise.
+static WEBP_INLINE WebPDemuxer* WebPDemux(const WebPData* const data) {
+ return WebPDemuxInternal(data, 0, NULL, WEBP_DEMUX_ABI_VERSION);
+}
+
+// Parses the WebP file given by 'data'.
+// If 'state' is non-NULL it will be set to indicate the status of the demuxer.
+// Returns a WebPDemuxer object on successful parse, NULL otherwise.
+static WEBP_INLINE WebPDemuxer* WebPDemuxPartial(
+ const WebPData* const data, WebPDemuxState* const state) {
+ return WebPDemuxInternal(data, 1, state, WEBP_DEMUX_ABI_VERSION);
+}
+
+// Frees memory associated with 'dmux'.
+WEBP_EXTERN(void) WebPDemuxDelete(WebPDemuxer* const dmux);
+
+//------------------------------------------------------------------------------
#if defined(__cplusplus) || defined(c_plusplus)
} // extern "C"
