1a8aa0dd05
Builds libwvmdrmengine.so, which is loaded by the new MediaDrm APIs to support playback of Widevine/CENC protected content. Change-Id: I6f57dd37083dfd96c402cb9dd137c7d74edc8f1c
69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
// Copyright 2012 Google Inc. All Rights Reserved.
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#ifndef CDM_BASE_BUFFER_READER_H_
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#define CDM_BASE_BUFFER_READER_H_
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#include <stdint.h>
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#include <string>
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#include <vector>
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#include "wv_cdm_types.h"
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namespace wvcdm {
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// Annotate a function indicating the caller must examine the return value.
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// Use like:
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// int foo() WARN_UNUSED_RESULT;
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// To explicitly ignore a result, see |ignore_result()| in <base/basictypes.h>.
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#if defined(COMPILER_GCC)
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#define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
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#else
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#define WARN_UNUSED_RESULT
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#endif
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class BufferReader {
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public:
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BufferReader(const uint8_t* buf, size_t size)
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: buf_(buf), size_(size), pos_(0) {}
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bool HasBytes(int count) { return (pos() + count <= size()); }
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// Read a value from the stream, performing endian correction,
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// and advance the stream pointer.
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bool Read1(uint8_t* v) WARN_UNUSED_RESULT;
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bool Read2(uint16_t* v) WARN_UNUSED_RESULT;
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bool Read2s(int16_t* v) WARN_UNUSED_RESULT;
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bool Read4(uint32_t* v) WARN_UNUSED_RESULT;
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bool Read4s(int32_t* v) WARN_UNUSED_RESULT;
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bool Read8(uint64_t* v) WARN_UNUSED_RESULT;
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bool Read8s(int64_t* v) WARN_UNUSED_RESULT;
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bool ReadString(std::string* str, int count) WARN_UNUSED_RESULT;
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bool ReadVec(std::vector<uint8_t>* t, int count) WARN_UNUSED_RESULT;
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// These variants read a 4-byte integer of the corresponding signedness and
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// store it in the 8-byte return type.
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bool Read4Into8(uint64_t* v) WARN_UNUSED_RESULT;
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bool Read4sInto8s(int64_t* v) WARN_UNUSED_RESULT;
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// Advance the stream by this many bytes.
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bool SkipBytes(int nbytes) WARN_UNUSED_RESULT;
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const uint8_t* data() const { return buf_; }
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size_t size() const { return size_; }
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size_t pos() const { return pos_; }
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protected:
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const uint8_t* buf_;
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size_t size_;
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size_t pos_;
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template<typename T> bool Read(T* t) WARN_UNUSED_RESULT;
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CORE_DISALLOW_COPY_AND_ASSIGN(BufferReader);
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};
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} // namespace wvcdm
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#endif // CDM_BASE_BUFFER_READER_H_
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