add examples/metadata.c

relocates the static functions from metadata.h and adds MetadataCopy()
to the interface

Change-Id: I28bfa9233d3dd70dddf6b561fe0bf4be378db1ec

Makefile.vc

@@ -173,6 +173,7 @@ DSP_OBJS = \
 
 EX_FORMAT_DEC_OBJS = \
     $(DIROBJ)\examples/jpegdec.obj \
+    $(DIROBJ)\examples/metadata.obj \
     $(DIROBJ)\examples/pngdec.obj \
     $(DIROBJ)\examples/tiffdec.obj \
 

examples/Makefile.am

@@ -20,7 +20,7 @@ dwebp_CPPFLAGS  = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
 dwebp_CPPFLAGS += $(JPEG_INCLUDES) $(PNG_INCLUDES)
 dwebp_LDADD = libexampleutil.la ../src/libwebp.la $(PNG_LIBS) $(JPEG_LIBS)
 
-cwebp_SOURCES  = cwebp.c metadata.h stopwatch.h
+cwebp_SOURCES  = cwebp.c metadata.c metadata.h stopwatch.h
 cwebp_SOURCES += jpegdec.c jpegdec.h
 cwebp_SOURCES += pngdec.c pngdec.h
 cwebp_SOURCES += tiffdec.c tiffdec.h

examples/metadata.c

@@ -0,0 +1,47 @@
+// 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/
+// -----------------------------------------------------------------------------
+//
+//  Metadata types and functions.
+//
+
+#include "./metadata.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "webp/types.h"
+
+void MetadataInit(Metadata* const metadata) {
+  if (metadata == NULL) return;
+  memset(metadata, 0, sizeof(*metadata));
+}
+
+void MetadataPayloadDelete(MetadataPayload* const payload) {
+  if (payload == NULL) return;
+  free(payload->bytes);
+  payload->bytes = NULL;
+  payload->size = 0;
+}
+
+void MetadataFree(Metadata* const metadata) {
+  if (metadata == NULL) return;
+  MetadataPayloadDelete(&metadata->exif);
+  MetadataPayloadDelete(&metadata->iccp);
+  MetadataPayloadDelete(&metadata->xmp);
+}
+
+int MetadataCopy(const char* metadata, size_t metadata_len,
+                 MetadataPayload* const payload) {
+  if (metadata == NULL || metadata_len == 0 || payload == NULL) return 0;
+  payload->bytes = (uint8_t*)malloc(metadata_len);
+  if (payload->bytes == NULL) return 0;
+  payload->size = metadata_len;
+  memcpy(payload->bytes, metadata, metadata_len);
+  return 1;
+}
+
+// -----------------------------------------------------------------------------

examples/metadata.h

@@ -30,21 +30,13 @@ typedef struct Metadata {
 
 #define METADATA_OFFSET(x) offsetof(Metadata, x)
 
-static void MetadataInit(Metadata* const m) {
+void MetadataInit(Metadata* const metadata);
-  memset(m, 0, sizeof(*m));
+void MetadataPayloadDelete(MetadataPayload* const payload);
-}
+void MetadataFree(Metadata* const metadata);
 
-static void MetadataPayloadDelete(MetadataPayload* const payload) {
+// Stores 'metadata' to 'payload->bytes', returns false on allocation error.
-  free(payload->bytes);
+int MetadataCopy(const char* metadata, size_t metadata_len,
-  payload->bytes = NULL;
+                 MetadataPayload* const payload);
-  payload->size = 0;
-}
-
-static void MetadataFree(Metadata* const m) {
-  MetadataPayloadDelete(&m->exif);
-  MetadataPayloadDelete(&m->iccp);
-  MetadataPayloadDelete(&m->xmp);
-}
 
 #if defined(__cplusplus) || defined(c_plusplus)
 }    // extern "C"

makefile.unix

@@ -126,6 +126,7 @@ ENC_OBJS = \
 
 EX_FORMAT_DEC_OBJS = \
     examples/jpegdec.o \
+    examples/metadata.o \
     examples/pngdec.o \
     examples/tiffdec.o \