1 files changed, 56 insertions, 0 deletions
diff --git a/dom/media/mp4/ResourceStream.cpp b/dom/media/mp4/ResourceStream.cpp
new file mode 100644
index 0000000000..ce2fb6f2f6
--- /dev/null
+++ b/dom/media/mp4/ResourceStream.cpp
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 "ResourceStream.h"
+
+namespace mozilla {
+
+ResourceStream::ResourceStream(mozilla::MediaResource* aResource)
+    : mResource(aResource), mPinCount(0) {
+  MOZ_ASSERT(aResource);
+  DDLINKCHILD("resource", &mResource);
+}
+
+ResourceStream::~ResourceStream() { MOZ_ASSERT(mPinCount == 0); }
+
+bool ResourceStream::ReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
+                            size_t* aBytesRead) {
+  uint32_t sum = 0;
+  uint32_t bytesRead = 0;
+  do {
+    uint64_t offset = aOffset + sum;
+    char* buffer = reinterpret_cast<char*>(aBuffer) + sum;
+    uint32_t toRead = aCount - sum;
+    nsresult rv = mResource.ReadAt(offset, buffer, toRead, &bytesRead);
+    if (NS_FAILED(rv)) {
+      return false;
+    }
+    sum += bytesRead;
+  } while (sum < aCount && bytesRead > 0);
+
+  *aBytesRead = sum;
+  return true;
+}
+
+bool ResourceStream::CachedReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
+                                  size_t* aBytesRead) {
+  nsresult rv = mResource.GetResource()->ReadFromCache(
+      reinterpret_cast<char*>(aBuffer), aOffset, aCount);
+  if (NS_FAILED(rv)) {
+    *aBytesRead = 0;
+    return false;
+  }
+  *aBytesRead = aCount;
+  return true;
+}
+
+bool ResourceStream::Length(int64_t* aSize) {
+  if (mResource.GetLength() < 0) return false;
+  *aSize = mResource.GetLength();
+  return true;
+}
+
+}  // namespace mozilla