1 files changed, 64 insertions, 0 deletions
diff --git a/netwerk/base/ContentRange.cpp b/netwerk/base/ContentRange.cpp
new file mode 100644
index 0000000000..dfae132550
--- /dev/null
+++ b/netwerk/base/ContentRange.cpp
@@ -0,0 +1,64 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ContentRange.h"
+#include "nsContentUtils.h"
+
+mozilla::net::ContentRange::ContentRange(const nsACString& aRangeHeader,
+                                         uint64_t aSize)
+    : mStart(0), mEnd(0), mSize(0) {
+  auto parsed = nsContentUtils::ParseSingleRangeRequest(aRangeHeader, true);
+  // https://fetch.spec.whatwg.org/#ref-for-simple-range-header-value%E2%91%A1
+  // If rangeValue is failure, then return a network error.
+  if (!parsed) {
+    return;
+  }
+
+  // Sanity check: ParseSingleRangeRequest should handle these two cases.
+  // If rangeEndValue and rangeStartValue are null, then return failure.
+  MOZ_ASSERT(parsed->Start().isSome() || parsed->End().isSome());
+  // If rangeStartValue and rangeEndValue are numbers, and rangeStartValue
+  // is greater than rangeEndValue, then return failure.
+  MOZ_ASSERT(parsed->Start().isNothing() || parsed->End().isNothing() ||
+             *parsed->Start() <= *parsed->End());
+
+  // https://fetch.spec.whatwg.org/#ref-for-simple-range-header-value%E2%91%A1
+  // If rangeStart is null:
+  if (parsed->Start().isNothing()) {
+    // Set rangeStart to fullLength − rangeEnd.
+    mStart = aSize - *parsed->End();
+
+    // Set rangeEnd to rangeStart + rangeEnd − 1.
+    mEnd = mStart + *parsed->End() - 1;
+
+    // Otherwise:
+  } else {
+    // If rangeStart is greater than or equal to fullLength, then return a
+    // network error.
+    if (*parsed->Start() >= aSize) {
+      return;
+    }
+    mStart = *parsed->Start();
+
+    // If rangeEnd is null or rangeEnd is greater than or equal to fullLength,
+    // then set rangeEnd to fullLength − 1.
+    if (parsed->End().isNothing() || *parsed->End() >= aSize) {
+      mEnd = aSize - 1;
+    } else {
+      mEnd = *parsed->End();
+    }
+  }
+  mSize = aSize;
+}
+
+void mozilla::net::ContentRange::AsHeader(nsACString& aOutString) const {
+  aOutString.Assign("bytes "_ns);
+  aOutString.AppendInt(mStart);
+  aOutString.AppendLiteral("-");
+  aOutString.AppendInt(mEnd);
+  aOutString.AppendLiteral("/");
+  aOutString.AppendInt(mSize);
+}