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/*
This file is part of Android File Transfer For Linux.
Copyright (C) 2015-2020 Vladimir Menshakov
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef AFTL_MTP_PTP_INPUTSTREAM_H
#define AFTL_MTP_PTP_INPUTSTREAM_H
#include <mtp/types.h>
#include <mtp/ByteArray.h>
namespace mtp
{
class InputStream //! MTP data decoding input stream
{
const ByteArray & _data;
size_t _offset;
public:
InputStream(const ByteArray & data, size_t offset = 0): _data(data), _offset(offset) { }
size_t GetOffset() const
{ return _offset; }
void Skip(size_t size)
{ _offset += size; }
const ByteArray & GetData() const
{ return _data; }
bool AtEnd() const
{ return _offset >= _data.size(); }
u8 Read8()
{ return _data.at(_offset++); }
u16 Read16()
{
u8 l = Read8();
u8 h = Read8();
return l | ((u16)h << 8);
}
u32 Read32()
{
u16 l = Read16();
u16 h = Read16();
return l | ((u32)h << 16);
}
u64 Read64()
{
u32 l = Read32();
u32 h = Read32();
return l | ((u64)h << 32);
}
u64 Read128() {
u64 l = Read64();
Skip(8); //fixme: truncated 128 bit value
return l;
}
std::string ReadString()
{ return ReadString(Read8()); }
std::string ReadString(unsigned len)
{
std::string str;
str.reserve(2 * len);
while(len--)
{
u16 ch = Read16();
if (ch == 0)
continue;
if (ch <= 0x7f)
str += (char)ch;
else if (ch <= 0x7ff)
{
str += (char) ((ch >> 6) | 0xc0);
str += (char) ((ch & 0x3f) | 0x80);
}
else //if (ch <= 0xffff)
{
str += (char)((ch >> 12) | 0xe0);
str += (char)(((ch & 0x0fc0) >> 6) | 0x80);
str += (char)( (ch & 0x003f) | 0x80);
}
}
return str;
}
template<typename ElementType>
std::vector<ElementType> ReadArray()
{
std::vector<ElementType> array;
if (AtEnd())
return array;
u32 size = Read32();
while(size--)
{
ElementType el;
(*this) >> el;
array.push_back(el);
}
return array;
}
};
inline InputStream & operator >> (InputStream &stream, u8 &value)
{ value = stream.Read8(); return stream; }
inline InputStream & operator >> (InputStream &stream, u16 &value)
{ value = stream.Read16(); return stream; }
inline InputStream & operator >> (InputStream &stream, u32 &value)
{ value = stream.Read32(); return stream; }
inline InputStream & operator >> (InputStream &stream, u64 &value)
{ value = stream.Read64(); return stream; }
inline InputStream & operator >> (InputStream &stream, s8 &value)
{ value = stream.Read8(); return stream; }
inline InputStream & operator >> (InputStream &stream, s16 &value)
{ value = stream.Read16(); return stream; }
inline InputStream & operator >> (InputStream &stream, s32 &value)
{ value = stream.Read32(); return stream; }
inline InputStream & operator >> (InputStream &stream, s64 &value)
{ value = stream.Read64(); return stream; }
inline InputStream & operator >> (InputStream &stream, std::string &value)
{ value = stream.ReadString(); return stream; }
template<typename ElementType>
inline InputStream & operator >> (InputStream &stream, std::vector<ElementType> &value)
{ value = stream.template ReadArray<ElementType>(); return stream; }
inline u64 ReadSingleInteger(const ByteArray &data)
{
InputStream s(data);
switch(data.size())
{
case 8: return s.Read64();
case 4: return s.Read32();
case 2: return s.Read16();
case 1: return s.Read8();
default:
throw std::runtime_error("unexpected length for numeric property");
}
}
inline std::string ReadSingleString(const ByteArray &data)
{
InputStream s(data);
std::string value;
s >> value;
return value;
}
template<typename ResponseType>
ResponseType ParseResponse(const ByteArray & data)
{
ResponseType response;
InputStream is(data);
response.Read(is);
return response;
}
}
#endif /* STREAM_H */
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