Initial import of Widevine Common Encryption DRM engine

Builds libwvmdrmengine.so, which is loaded by the new
MediaDrm APIs to support playback of Widevine/CENC
protected content.

Change-Id: I6f57dd37083dfd96c402cb9dd137c7d74edc8f1c

libwvdrmengine/cdm/core/src/buffer_reader.cpp

@@ -0,0 +1,94 @@
+// Copyright 2012 Google Inc. All Rights Reserved.
+
+#include "buffer_reader.h"
+
+#include "log.h"
+
+namespace wvcdm {
+
+bool BufferReader::Read1(uint8_t* v) {
+  if (!HasBytes(1)) {
+    LOGE("BufferReader::Read1 : Failure while parsing: Not enough bytes (1)");
+    return false;
+  }
+
+  *v = buf_[pos_++];
+  return true;
+}
+
+// Internal implementation of multi-byte reads
+template<typename T> bool BufferReader::Read(T* v) {
+  if (!HasBytes(sizeof(T))) {
+    LOGE("BufferReader::Read<T> : Failure while parsing: Not enough bytes (%u)", sizeof(T));
+    return false;
+  }
+
+  T tmp = 0;
+  for (size_t i = 0; i < sizeof(T); i++) {
+    tmp <<= 8;
+    tmp += buf_[pos_++];
+  }
+  *v = tmp;
+  return true;
+}
+
+bool BufferReader::Read2(uint16_t* v) { return Read(v); }
+bool BufferReader::Read2s(int16_t* v) { return Read(v); }
+bool BufferReader::Read4(uint32_t* v) { return Read(v); }
+bool BufferReader::Read4s(int32_t* v) { return Read(v); }
+bool BufferReader::Read8(uint64_t* v) { return Read(v); }
+bool BufferReader::Read8s(int64_t* v) { return Read(v); }
+
+bool BufferReader::ReadString(std::string* str, int count) {
+  if (!HasBytes(count)) {
+    LOGE("BufferReader::ReadString : Failure while parsing: Not enough bytes (%d)", count);
+    return false;
+  }
+
+  str->assign(buf_ + pos_, buf_ + pos_ + count);
+  pos_ += count;
+  return true;
+}
+
+bool BufferReader::ReadVec(std::vector<uint8_t>* vec, int count) {
+  if (!HasBytes(count)) {
+    LOGE("BufferReader::ReadVec : Failure while parsing: Not enough bytes (%d)", count);
+    return false;
+  }
+
+  vec->clear();
+  vec->insert(vec->end(), buf_ + pos_, buf_ + pos_ + count);
+  pos_ += count;
+  return true;
+}
+
+bool BufferReader::SkipBytes(int bytes) {
+  if (!HasBytes(bytes)) {
+    LOGE("BufferReader::SkipBytes : Failure while parsing: Not enough bytes (%d)", bytes);
+    return false;
+  }
+
+  pos_ += bytes;
+  return true;
+}
+
+bool BufferReader::Read4Into8(uint64_t* v) {
+  uint32_t tmp;
+  if (!Read4(&tmp)) {
+    return false;
+  }
+  *v = tmp;
+  return true;
+}
+
+bool BufferReader::Read4sInto8s(int64_t* v) {
+  // Beware of the need for sign extension.
+  int32_t tmp;
+  if (!Read4s(&tmp)) {
+    return false;
+  }
+  *v = tmp;
+  return true;
+}
+
+}  // namespace wvcdm