git-svn-id: http://mc-server.googlecode.com/svn/trunk@1062 0a769ca7-a7f5-676a-18bf-c427514a06d6
655 lines
11 KiB
C++
655 lines
11 KiB
C++
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// ByteBuffer.cpp
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// Implements the cByteBuffer class representing a ringbuffer of bytes
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#include "Globals.h"
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#include "ByteBuffer.h"
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#include "Endianness.h"
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#include "OSSupport/IsThread.h"
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#define NEEDBYTES(Num) if (!CanReadBytes(Num)) return false;
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#define PUTBYTES(Num) if (!CanWriteBytes(Num)) return false;
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#ifdef _DEBUG
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/// Simple RAII class that uses one internal unsigned long for checking if two threads are using an object simultanously
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class cSingleThreadAccessChecker
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{
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public:
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cSingleThreadAccessChecker(unsigned long * a_ThreadID) :
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m_ThreadID(a_ThreadID)
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{
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ASSERT((*a_ThreadID == 0) || (*a_ThreadID == cIsThread::GetCurrentID()));
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}
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~cSingleThreadAccessChecker()
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{
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*m_ThreadID = 0;
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}
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protected:
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unsigned long * m_ThreadID;
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} ;
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#define CHECK_THREAD cSingleThreadAccessChecker Checker(const_cast<unsigned long *>(&m_ThreadID))
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#else
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#define CHECK_THREAD
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#endif
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// cByteBuffer:
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cByteBuffer::cByteBuffer(int a_BufferSize) :
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m_Buffer(new char[a_BufferSize + 1]),
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m_BufferSize(a_BufferSize + 1),
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#ifdef _DEBUG
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m_ThreadID(0),
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#endif // _DEBUG
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m_DataStart(0),
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m_WritePos(0),
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m_ReadPos(0)
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{
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// Allocating one byte more than the buffer size requested, so that we can distinguish between
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// completely-full and completely-empty states
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}
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cByteBuffer::~cByteBuffer()
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{
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CheckValid();
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delete[] m_Buffer;
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}
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bool cByteBuffer::Write(const char * a_Bytes, int a_Count)
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{
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CHECK_THREAD;
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CheckValid();
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// Store the current free space for a check after writing:
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int CurFreeSpace = GetFreeSpace();
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int CurReadableSpace = GetReadableSpace();
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int WrittenBytes = 0;
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if (GetFreeSpace() < a_Count)
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{
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return false;
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}
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int TillEnd = m_BufferSize - m_WritePos;
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if (TillEnd <= a_Count)
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{
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// Need to wrap around the ringbuffer end
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if (TillEnd > 0)
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{
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memcpy(m_Buffer + m_WritePos, a_Bytes, TillEnd);
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a_Bytes += TillEnd;
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a_Count -= TillEnd;
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WrittenBytes = TillEnd;
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}
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m_WritePos = 0;
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}
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// We're guaranteed that we'll fit in a single write op
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if (a_Count > 0)
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{
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memcpy(m_Buffer + m_WritePos, a_Bytes, a_Count);
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m_WritePos += a_Count;
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WrittenBytes += a_Count;
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}
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ASSERT(GetFreeSpace() == CurFreeSpace - WrittenBytes);
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ASSERT(GetReadableSpace() == CurReadableSpace + WrittenBytes);
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return true;
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}
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int cByteBuffer::GetFreeSpace(void) const
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{
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CHECK_THREAD;
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CheckValid();
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if (m_WritePos >= m_DataStart)
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{
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// Wrap around the buffer end:
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return m_BufferSize - m_WritePos + m_DataStart - 1;
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}
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// Single free space partition:
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return m_DataStart - m_WritePos - 1;
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}
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/// Returns the number of bytes that are currently in the ringbuffer. Note GetReadableBytes()
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int cByteBuffer::GetUsedSpace(void) const
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{
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CHECK_THREAD;
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CheckValid();
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return m_BufferSize - GetFreeSpace();
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}
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/// Returns the number of bytes that are currently available for reading (may be less than UsedSpace due to some data having been read already)
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int cByteBuffer::GetReadableSpace(void) const
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{
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CHECK_THREAD;
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CheckValid();
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if (m_ReadPos > m_WritePos)
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{
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// Wrap around the buffer end:
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return m_BufferSize - m_ReadPos + m_WritePos;
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}
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// Single readable space partition:
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return m_WritePos - m_ReadPos ;
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}
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bool cByteBuffer::CanReadBytes(int a_Count) const
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{
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CHECK_THREAD;
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CheckValid();
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return (a_Count <= GetReadableSpace());
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}
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bool cByteBuffer::CanWriteBytes(int a_Count) const
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{
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CHECK_THREAD;
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CheckValid();
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return (a_Count <= GetFreeSpace());
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}
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bool cByteBuffer::ReadChar(char & a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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NEEDBYTES(1);
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ReadBuf(&a_Value, 1);
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return true;
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}
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bool cByteBuffer::ReadByte(unsigned char & a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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NEEDBYTES(1);
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ReadBuf(&a_Value, 1);
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return true;
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}
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bool cByteBuffer::ReadBEShort(short & a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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NEEDBYTES(2);
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ReadBuf(&a_Value, 2);
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a_Value = ntohs(a_Value);
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return true;
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}
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bool cByteBuffer::ReadBEInt(int & a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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NEEDBYTES(4);
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ReadBuf(&a_Value, 4);
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a_Value = ntohl(a_Value);
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return true;
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}
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bool cByteBuffer::ReadBEInt64(Int64 & a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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NEEDBYTES(8);
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ReadBuf(&a_Value, 8);
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a_Value = NetworkToHostLong8(&a_Value);
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return true;
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}
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bool cByteBuffer::ReadBEFloat(float & a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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NEEDBYTES(4);
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ReadBuf(&a_Value, 4);
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a_Value = NetworkToHostFloat4(&a_Value);
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return true;
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}
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bool cByteBuffer::ReadBEDouble(double & a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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NEEDBYTES(8);
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ReadBuf(&a_Value, 8);
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a_Value = NetworkToHostDouble8(&a_Value);
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return true;
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}
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bool cByteBuffer::ReadBool(bool & a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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NEEDBYTES(1);
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a_Value = (m_Buffer[m_ReadPos++] != 0);
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return true;
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}
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bool cByteBuffer::ReadBEUTF16String16(AString & a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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short Length;
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if (!ReadBEShort(Length))
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{
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return false;
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}
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return ReadUTF16String(a_Value, Length);
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}
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bool cByteBuffer::WriteChar(char a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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PUTBYTES(1);
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return WriteBuf(&a_Value, 1);
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}
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bool cByteBuffer::WriteByte(unsigned char a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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PUTBYTES(1);
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return WriteBuf(&a_Value, 1);
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}
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bool cByteBuffer::WriteBEShort(short a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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PUTBYTES(2);
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short Converted = htons(a_Value);
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return WriteBuf(&Converted, 2);
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}
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bool cByteBuffer::WriteBEInt(int a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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PUTBYTES(4);
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int Converted = HostToNetwork4(&a_Value);
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return WriteBuf(&Converted, 4);
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}
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bool cByteBuffer::WriteBEInt64(Int64 a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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PUTBYTES(8);
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Int64 Converted = HostToNetwork8(&a_Value);
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return WriteBuf(&Converted, 8);
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}
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bool cByteBuffer::WriteBEFloat(float a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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PUTBYTES(4);
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int Converted = HostToNetwork4(&a_Value);
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return WriteBuf(&Converted, 4);
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}
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bool cByteBuffer::WriteBEDouble(double a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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PUTBYTES(8);
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Int64 Converted = HostToNetwork8(&a_Value);
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return WriteBuf(&Converted, 8);
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}
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bool cByteBuffer::WriteBool(bool a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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return WriteChar(a_Value ? 1 : 0);
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}
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bool cByteBuffer::WriteBEUTF16String16(const AString & a_Value)
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{
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CHECK_THREAD;
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CheckValid();
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PUTBYTES(2);
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AString UTF16BE;
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UTF8ToRawBEUTF16(a_Value.data(), a_Value.size(), UTF16BE);
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WriteBEShort((short)(UTF16BE.size() / 2));
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PUTBYTES(UTF16BE.size());
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WriteBuf(UTF16BE.data(), UTF16BE.size());
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return true;
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}
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bool cByteBuffer::ReadBuf(void * a_Buffer, int a_Count)
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{
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CHECK_THREAD;
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CheckValid();
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ASSERT(a_Count >= 0);
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NEEDBYTES(a_Count);
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char * Dst = (char *)a_Buffer; // So that we can do byte math
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int BytesToEndOfBuffer = m_BufferSize - m_ReadPos;
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ASSERT(BytesToEndOfBuffer >= 0); // Sanity check
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if (BytesToEndOfBuffer <= a_Count)
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{
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// Reading across the ringbuffer end, read the first part and adjust parameters:
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if (BytesToEndOfBuffer > 0)
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{
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memcpy(Dst, m_Buffer + m_ReadPos, BytesToEndOfBuffer);
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Dst += BytesToEndOfBuffer;
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a_Count -= BytesToEndOfBuffer;
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}
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m_ReadPos = 0;
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}
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// Read the rest of the bytes in a single read (guaranteed to fit):
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if (a_Count > 0)
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{
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memcpy(Dst, m_Buffer + m_ReadPos, a_Count);
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m_ReadPos += a_Count;
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}
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return true;
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}
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bool cByteBuffer::WriteBuf(const void * a_Buffer, int a_Count)
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{
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CHECK_THREAD;
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CheckValid();
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ASSERT(a_Count >= 0);
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PUTBYTES(a_Count);
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char * Src = (char *)a_Buffer; // So that we can do byte math
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int BytesToEndOfBuffer = m_BufferSize - m_WritePos;
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if (BytesToEndOfBuffer <= a_Count)
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{
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// Reading across the ringbuffer end, read the first part and adjust parameters:
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memcpy(m_Buffer + m_WritePos, Src, BytesToEndOfBuffer);
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Src += BytesToEndOfBuffer;
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a_Count -= BytesToEndOfBuffer;
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m_WritePos = 0;
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}
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// Read the rest of the bytes in a single read (guaranteed to fit):
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if (a_Count > 0)
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{
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memcpy(m_Buffer + m_WritePos, Src, a_Count);
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m_WritePos += a_Count;
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}
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return true;
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}
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bool cByteBuffer::ReadString(AString & a_String, int a_Count)
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{
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CHECK_THREAD;
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CheckValid();
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ASSERT(a_Count >= 0);
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NEEDBYTES(a_Count);
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a_String.clear();
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a_String.reserve(a_Count);
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int BytesToEndOfBuffer = m_BufferSize - m_ReadPos;
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ASSERT(BytesToEndOfBuffer >= 0); // Sanity check
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if (BytesToEndOfBuffer <= a_Count)
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{
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// Reading across the ringbuffer end, read the first part and adjust parameters:
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if (BytesToEndOfBuffer > 0)
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{
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a_String.assign(m_Buffer + m_ReadPos, BytesToEndOfBuffer);
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a_Count -= BytesToEndOfBuffer;
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}
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m_ReadPos = 0;
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}
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// Read the rest of the bytes in a single read (guaranteed to fit):
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if (a_Count > 0)
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{
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a_String.append(m_Buffer + m_ReadPos, a_Count);
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m_ReadPos += a_Count;
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}
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return true;
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}
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bool cByteBuffer::ReadUTF16String(AString & a_String, int a_NumChars)
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{
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// Reads 2 * a_NumChars bytes and interprets it as a UTF16 string, converting it into UTF8 string a_String
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CHECK_THREAD;
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CheckValid();
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ASSERT(a_NumChars >= 0);
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AString RawData;
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if (!ReadString(RawData, a_NumChars * 2))
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{
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return false;
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}
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RawBEToUTF8((short *)(RawData.data()), a_NumChars, a_String);
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return true;
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}
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bool cByteBuffer::SkipRead(int a_Count)
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{
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CHECK_THREAD;
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CheckValid();
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ASSERT(a_Count >= 0);
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if (!CanReadBytes(a_Count))
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{
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return false;
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}
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AdvanceReadPos(a_Count);
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return true;
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}
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void cByteBuffer::ReadAll(AString & a_Data)
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{
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CHECK_THREAD;
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CheckValid();
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ReadString(a_Data, GetReadableSpace());
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}
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void cByteBuffer::CommitRead(void)
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{
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CHECK_THREAD;
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CheckValid();
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m_DataStart = m_ReadPos;
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}
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void cByteBuffer::ResetRead(void)
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{
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CHECK_THREAD;
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CheckValid();
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m_ReadPos = m_DataStart;
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}
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void cByteBuffer::ReadAgain(AString & a_Out)
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{
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// Return the data between m_DataStart and m_ReadPos (the data that has been read but not committed)
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// Used by ProtoProxy to repeat communication twice, once for parsing and the other time for the remote party
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CHECK_THREAD;
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CheckValid();
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int DataStart = m_DataStart;
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if (m_ReadPos < m_DataStart)
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{
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// Across the ringbuffer end, read the first part and adjust next part's start:
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a_Out.append(m_Buffer + m_DataStart, m_BufferSize - m_DataStart);
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DataStart = 0;
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}
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a_Out.append(m_Buffer + DataStart, m_ReadPos - DataStart);
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}
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void cByteBuffer::AdvanceReadPos(int a_Count)
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{
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CHECK_THREAD;
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CheckValid();
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m_ReadPos += a_Count;
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if (m_ReadPos > m_BufferSize)
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{
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m_ReadPos -= m_BufferSize;
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}
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}
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void cByteBuffer::CheckValid(void) const
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{
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ASSERT(m_ReadPos >= 0);
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ASSERT(m_ReadPos < m_BufferSize);
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ASSERT(m_WritePos >= 0);
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ASSERT(m_WritePos < m_BufferSize);
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}
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