Reject unadvertised encodings

net/filter/filter_source_stream.cc

Index: net/filter/filter_source_stream.cc
diff --git a/net/filter/filter_source_stream.cc b/net/filter/filter_source_stream.cc
index 603bd703c8e7311744fc74e0ae868a383d0cb518..a2d5a709c3c0f4b37606dc605666e86bbc7715be 100644
--- a/net/filter/filter_source_stream.cc
+++ b/net/filter/filter_source_stream.cc
@@ -17,6 +17,12 @@ namespace net {
 
 namespace {
 
+const char kDeflate[] = "deflate";
+const char kGZip[] = "gzip";
+const char kSdch[] = "sdch";
+const char kXGZip[] = "x-gzip";
+const char kBrotli[] = "br";
+
 const size_t kBufferSize = 32 * 1024;
 
 }  // namespace
@@ -67,6 +73,28 @@ std::string FilterSourceStream::Description() const {
   return next_type_string + "," + GetTypeAsString();
 }
 
+FilterSourceStream::SourceType FilterSourceStream::ParseEncodingType(
+    const std::string& encoding) {
+  if (encoding.empty()) {
+    return TYPE_NONE;
+  } else if (base::LowerCaseEqualsASCII(encoding, kBrotli)) {
+    return TYPE_BROTLI;
+  } else if (base::LowerCaseEqualsASCII(encoding, kDeflate)) {
+    return TYPE_DEFLATE;
+  } else if (base::LowerCaseEqualsASCII(encoding, kGZip) ||
+             base::LowerCaseEqualsASCII(encoding, kXGZip)) {
+    return TYPE_GZIP;
+  } else if (base::LowerCaseEqualsASCII(encoding, kSdch)) {
+    return TYPE_SDCH;
+  } else {
+    return TYPE_UNKNOWN;
+  }
+}
+
+void FilterSourceStream::ReportContentDecodingRejected(SourceType type) {
+  UMA_HISTOGRAM_ENUMERATION("Net.ContentDecodingRejected", type, TYPE_MAX);
+}
+
 int FilterSourceStream::DoLoop(int result) {
   DCHECK_NE(STATE_NONE, next_state_);