cosmetics: remove use of 'sanity' / 'master'

replace with more inclusive terms or remove the comment entirely if the
meaning was already clear.

Bug: webp:507
Change-Id: Ica3bbf751ebf79f6668df6e6209af770248ff4ca

src/dec/alpha_dec.c

@@ -183,7 +183,7 @@ const uint8_t* VP8DecompressAlphaRows(VP8Decoder* const dec,
   assert(dec != NULL && io != NULL);
 
   if (row < 0 || num_rows <= 0 || row + num_rows > height) {
-    return NULL;    // sanity check.
+    return NULL;
   }
 
   if (!dec->is_alpha_decoded_) {

src/dec/buffer_dec.c

@@ -117,7 +117,6 @@ static VP8StatusCode AllocateBuffer(WebPDecBuffer* const buffer) {
     }
     total_size = size + 2 * uv_size + a_size;
 
-    // Security/sanity checks
     output = (uint8_t*)WebPSafeMalloc(total_size, sizeof(*output));
     if (output == NULL) {
       return VP8_STATUS_OUT_OF_MEMORY;

src/dec/vp8_dec.c

@@ -335,7 +335,7 @@ int VP8GetHeaders(VP8Decoder* const dec, VP8Io* const io) {
     io->scaled_width = io->width;
     io->scaled_height = io->height;
 
-    io->mb_w = io->width;   // sanity check
+    io->mb_w = io->width;   // for soundness
     io->mb_h = io->height;  // ditto
 
     VP8ResetProba(&dec->proba_);

src/dec/vp8l_dec.c

@@ -1514,7 +1514,7 @@ static int AllocateInternalBuffers32b(VP8LDecoder* const dec, int final_width) {
   assert(dec->width_ <= final_width);
   dec->pixels_ = (uint32_t*)WebPSafeMalloc(total_num_pixels, sizeof(uint32_t));
   if (dec->pixels_ == NULL) {
-    dec->argb_cache_ = NULL;    // for sanity check
+    dec->argb_cache_ = NULL;    // for soundness
     dec->status_ = VP8_STATUS_OUT_OF_MEMORY;
     return 0;
   }
@@ -1524,7 +1524,7 @@ static int AllocateInternalBuffers32b(VP8LDecoder* const dec, int final_width) {
 
 static int AllocateInternalBuffers8b(VP8LDecoder* const dec) {
   const uint64_t total_num_pixels = (uint64_t)dec->width_ * dec->height_;
-  dec->argb_cache_ = NULL;    // for sanity check
+  dec->argb_cache_ = NULL;    // for soundness
   dec->pixels_ = (uint32_t*)WebPSafeMalloc(total_num_pixels, sizeof(uint8_t));
   if (dec->pixels_ == NULL) {
     dec->status_ = VP8_STATUS_OUT_OF_MEMORY;
@@ -1666,7 +1666,6 @@ int VP8LDecodeImage(VP8LDecoder* const dec) {
   VP8Io* io = NULL;
   WebPDecParams* params = NULL;
 
-  // Sanity checks.
   if (dec == NULL) return 0;
 
   assert(dec->hdr_.huffman_tables_ != NULL);

src/enc/alpha_enc.c

@@ -303,7 +303,7 @@ static int EncodeAlpha(VP8Encoder* const enc,
   int ok = 1;
   const int reduce_levels = (quality < 100);
 
-  // quick sanity checks
+  // quick correctness checks
   assert((uint64_t)data_size == (uint64_t)width * height);  // as per spec
   assert(enc != NULL && pic != NULL && pic->a != NULL);
   assert(output != NULL && output_size != NULL);
@@ -375,7 +375,7 @@ static int CompressAlphaJob(void* arg1, void* unused) {
                    filter, effort_level, &alpha_data, &alpha_size)) {
     return 0;
   }
-  if (alpha_size != (uint32_t)alpha_size) {  // Sanity check.
+  if (alpha_size != (uint32_t)alpha_size) {  // Soundness check.
     WebPSafeFree(alpha_data);
     return 0;
   }

src/enc/syntax_enc.c

@@ -349,7 +349,7 @@ int VP8EncWrite(VP8Encoder* const enc) {
                                        (enc->alpha_data_size_ & 1);
     riff_size += CHUNK_HEADER_SIZE + padded_alpha_size;
   }
-  // Sanity check.
+  // RIFF size should fit in 32-bits.
   if (riff_size > 0xfffffffeU) {
     return WebPEncodingSetError(pic, VP8_ENC_ERROR_FILE_TOO_BIG);
   }

src/mux/anim_encode.c

@@ -418,7 +418,7 @@ static void MinimizeChangeRectangle(const WebPPicture* const src,
   const int max_allowed_diff_lossy = QualityToMaxDiff(quality);
   const int max_allowed_diff = is_lossless ? 0 : max_allowed_diff_lossy;
 
-  // Sanity checks.
+  // Assumption/correctness checks.
   assert(src->width == dst->width && src->height == dst->height);
   assert(rect->x_offset_ + rect->width_ <= dst->width);
   assert(rect->y_offset_ + rect->height_ <= dst->height);

src/mux/muxedit.c

@@ -235,7 +235,6 @@ WebPMuxError WebPMuxSetImage(WebPMux* mux, const WebPData* bitstream,
   WebPMuxImage wpi;
   WebPMuxError err;
 
-  // Sanity checks.
   if (mux == NULL || bitstream == NULL || bitstream->bytes == NULL ||
       bitstream->size > MAX_CHUNK_PAYLOAD) {
     return WEBP_MUX_INVALID_ARGUMENT;
@@ -267,7 +266,6 @@ WebPMuxError WebPMuxPushFrame(WebPMux* mux, const WebPMuxFrameInfo* info,
   WebPMuxImage wpi;
   WebPMuxError err;
 
-  // Sanity checks.
   if (mux == NULL || info == NULL) return WEBP_MUX_INVALID_ARGUMENT;
 
   if (info->id != WEBP_CHUNK_ANMF) return WEBP_MUX_INVALID_ARGUMENT;

src/mux/muxread.c

@@ -56,7 +56,7 @@ static WebPMuxError ChunkVerifyAndAssign(WebPChunk* chunk,
   uint32_t chunk_size;
   WebPData chunk_data;
 
-  // Sanity checks.
+  // Correctness checks.
   if (data_size < CHUNK_HEADER_SIZE) return WEBP_MUX_NOT_ENOUGH_DATA;
   chunk_size = GetLE32(data + TAG_SIZE);
   if (chunk_size > MAX_CHUNK_PAYLOAD) return WEBP_MUX_BAD_DATA;
@@ -186,7 +186,6 @@ WebPMux* WebPMuxCreateInternal(const WebPData* bitstream, int copy_data,
   WebPChunk** chunk_list_ends[WEBP_CHUNK_NIL + 1] = { NULL };
   ChunkInit(&chunk);
 
-  // Sanity checks.
   if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_MUX_ABI_VERSION)) {
     return NULL;  // version mismatch
   }
@@ -481,7 +480,6 @@ WebPMuxError WebPMuxGetFrame(
   WebPMuxError err;
   WebPMuxImage* wpi;
 
-  // Sanity checks.
   if (mux == NULL || frame == NULL) {
     return WEBP_MUX_INVALID_ARGUMENT;
   }