michael@0: //
michael@0: // Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: //
michael@0: 
michael@0: // BinaryStream.h: Provides binary serialization of simple types.
michael@0: 
michael@0: #ifndef LIBGLESV2_BINARYSTREAM_H_
michael@0: #define LIBGLESV2_BINARYSTREAM_H_
michael@0: 
michael@0: #include "common/angleutils.h"
michael@0: 
michael@0: namespace gl
michael@0: {
michael@0: 
michael@0: class BinaryInputStream
michael@0: {
michael@0:   public:
michael@0:     BinaryInputStream(const void *data, size_t length)
michael@0:     {
michael@0:         mError = false;
michael@0:         mOffset = 0;
michael@0:         mData = static_cast<const char*>(data);
michael@0:         mLength = length;
michael@0:     }
michael@0: 
michael@0:     template <typename T>
michael@0:     void read(T *v, size_t num)
michael@0:     {
michael@0:         union
michael@0:         {
michael@0:             T dummy;  // Compilation error for non-trivial types
michael@0:         } dummy;
michael@0:         (void) dummy;
michael@0: 
michael@0:         if (mError)
michael@0:         {
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         size_t length = num * sizeof(T);
michael@0: 
michael@0:         if (mOffset + length > mLength)
michael@0:         {
michael@0:             mError = true;
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         memcpy(v, mData + mOffset, length);
michael@0:         mOffset += length;
michael@0:     }
michael@0: 
michael@0:     template <typename T>
michael@0:     void read(T * v)
michael@0:     {
michael@0:         read(v, 1);
michael@0:     }
michael@0: 
michael@0:     void read(std::string *v)
michael@0:     {
michael@0:         size_t length;
michael@0:         read(&length);
michael@0: 
michael@0:         if (mError)
michael@0:         {
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         if (mOffset + length > mLength)
michael@0:         {
michael@0:             mError = true;
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         v->assign(mData + mOffset, length);
michael@0:         mOffset += length;
michael@0:     }
michael@0: 
michael@0:     void skip(size_t length)
michael@0:     {
michael@0:         if (mOffset + length > mLength)
michael@0:         {
michael@0:             mError = true;
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         mOffset += length;
michael@0:     }
michael@0: 
michael@0:     size_t offset() const
michael@0:     {
michael@0:         return mOffset;
michael@0:     }
michael@0: 
michael@0:     bool error() const
michael@0:     {
michael@0:         return mError;
michael@0:     }
michael@0: 
michael@0:     bool endOfStream() const
michael@0:     {
michael@0:         return mOffset == mLength;
michael@0:     }
michael@0: 
michael@0:   private:
michael@0:     DISALLOW_COPY_AND_ASSIGN(BinaryInputStream);
michael@0:     bool mError;
michael@0:     size_t mOffset;
michael@0:     const char *mData;
michael@0:     size_t mLength;
michael@0: };
michael@0: 
michael@0: class BinaryOutputStream
michael@0: {
michael@0:   public:
michael@0:     BinaryOutputStream()
michael@0:     {
michael@0:     }
michael@0: 
michael@0:     template <typename T>
michael@0:     void write(const T *v, size_t num)
michael@0:     {
michael@0:         union
michael@0:         {
michael@0:             T dummy;  // Compilation error for non-trivial types
michael@0:         } dummy;
michael@0:         (void) dummy;
michael@0: 
michael@0:         const char *asBytes = reinterpret_cast<const char*>(v);
michael@0:         mData.insert(mData.end(), asBytes, asBytes + num * sizeof(T));
michael@0:     }
michael@0: 
michael@0:     template <typename T>
michael@0:     void write(const T &v)
michael@0:     {
michael@0:         write(&v, 1);
michael@0:     }
michael@0: 
michael@0:     void write(const std::string &v)
michael@0:     {
michael@0:         size_t length = v.length();
michael@0:         write(length);
michael@0: 
michael@0:         write(v.c_str(), length);
michael@0:     }
michael@0: 
michael@0:     size_t length() const
michael@0:     {
michael@0:         return mData.size();
michael@0:     }
michael@0: 
michael@0:     const void* data() const
michael@0:     {
michael@0:         return mData.size() ? &mData[0] : NULL;
michael@0:     }
michael@0: 
michael@0:   private:
michael@0:     DISALLOW_COPY_AND_ASSIGN(BinaryOutputStream);
michael@0:     std::vector<char> mData;
michael@0: };
michael@0: }
michael@0: 
michael@0: #endif  // LIBGLESV2_BINARYSTREAM_H_