1 files changed, 67 insertions, 0 deletions
diff --git a/media/libstagefright/binding/ResourceStream.cpp b/media/libstagefright/binding/ResourceStream.cpp
new file mode 100644
index 0000000000..2fd042cf4f
--- /dev/null
+++ b/media/libstagefright/binding/ResourceStream.cpp
@@ -0,0 +1,67 @@
+/* -*- 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 "mp4_demuxer/ResourceStream.h"
+
+namespace mp4_demuxer {
+
+ResourceStream::ResourceStream(mozilla::MediaResource* aResource)
+  : mResource(aResource)
+  , mPinCount(0)
+{
+  MOZ_ASSERT(aResource);
+}
+
+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->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 mp4_demuxer