imageio/*dec,Read*: add input parameter checks

Change-Id: I5e069d6ea4da9d8c71be03ef99aad679dd1aad21

imageio/jpegdec.c

@@ -266,6 +266,8 @@ int ReadJPEG(const uint8_t* const data, size_t data_size,
   JSAMPROW buffer[1];
   JPEGReadContext ctx;
 
+  if (data == NULL || data_size == 0 || pic == NULL) return 0;
+
   (void)keep_alpha;
   memset(&ctx, 0, sizeof(ctx));
   ctx.data = data;

imageio/pngdec.c

@@ -220,6 +220,8 @@ int ReadPNG(const uint8_t* const data, size_t data_size,
   int64_t stride;
   uint8_t* volatile rgb = NULL;
 
+  if (data == NULL || data_size == 0 || pic == NULL) return 0;
+
   context.data = data;
   context.data_size = data_size;
 

imageio/tiffdec.c

@@ -120,15 +120,18 @@ int ReadTIFF(const uint8_t* const data, size_t data_size,
              WebPPicture* const pic, int keep_alpha,
              Metadata* const metadata) {
   MyData my_data = { data, (toff_t)data_size, 0 };
-  TIFF* const tif = TIFFClientOpen("Memory", "r", &my_data,
+  TIFF* tif;
-                                   MyRead, MyRead, MySeek, MyClose,
-                                   MySize, MyMapFile, MyUnmapFile);
   uint32 width, height;
   uint32* raster;
   int64_t alloc_size;
   int ok = 0;
   tdir_t dircount;
 
+  if (data == NULL || data_size == 0 || pic == NULL) return 0;
+
+  tif = TIFFClientOpen("Memory", "r", &my_data,
+                       MyRead, MyRead, MySeek, MyClose,
+                       MySize, MyMapFile, MyUnmapFile);
   if (tif == NULL) {
     fprintf(stderr, "Error! Cannot parse TIFF file\n");
     return 0;

imageio/webpdec.c

@@ -143,6 +143,8 @@ int ReadWebP(const uint8_t* const data, size_t data_size,
   WebPDecBuffer* const output_buffer = &config.output;
   WebPBitstreamFeatures* const bitstream = &config.input;
 
+  if (data == NULL || data_size == 0 || pic == NULL) return 0;
+
   // TODO(jzern): add Exif/XMP/ICC extraction.
   if (metadata != NULL) {
     fprintf(stderr, "Warning: metadata extraction from WebP is unsupported.\n");

imageio/wicdec.c

@@ -276,6 +276,8 @@ int ReadPictureWithWIC(const char* const filename,
   int has_alpha = 0;
   int64_t stride;
 
+  if (filename == NULL || pic == NULL) return 0;
+
   IFS(CoInitialize(NULL));
   IFS(CoCreateInstance(MAKE_REFGUID(CLSID_WICImagingFactory), NULL,
                        CLSCTX_INPROC_SERVER,