1 files changed, 7 insertions, 6 deletions
diff --git a/src/lib/jpeg.h b/src/lib/jpeg.h
index d2e9e5ffcf..c5179c8c4f 100644
--- a/src/lib/jpeg.h
+++ b/src/lib/jpeg.h
@@ -5,12 +5,13 @@
 
 #include <stdlib.h>
 
-#define JPEG_DECODE_FAILED 1
+/* These functions return NULL on success and a short error message on
+ * failure. Callers should not free the returned pointer. */
 
-int jpeg_fetch_size(unsigned char *filedata, size_t filesize, unsigned int *width,
-		    unsigned int *height);
-int jpeg_decode(unsigned char *filedata, size_t filesize, unsigned char *framebuffer,
-		unsigned int width, unsigned int height, unsigned int bytes_per_line,
-		unsigned int depth);
+const char *jpeg_fetch_size(unsigned char *filedata, size_t filesize, unsigned int *width,
+			    unsigned int *height);
+const char *jpeg_decode(unsigned char *filedata, size_t filesize, unsigned char *framebuffer,
+			unsigned int width, unsigned int height, unsigned int bytes_per_line,
+			unsigned int depth);
 
 #endif