d1dee3c909
On RasPi with gcc 4.8.2, the asserts wouldn't compile when tests were enabled. Enforced the assumption that ASSERT code is generated only in Debug builds.
991 lines
18 KiB
C++
991 lines
18 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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/** When defined, each access to a cByteBuffer object is checked whether it's done in the same thread.
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cByteBuffer assumes that it is not used by multiple threads at once, this macro adds a runtime check for that.
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Unfortunately it is very slow, so it is disabled even for regular DEBUG builds. */
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// #define DEBUG_SINGLE_THREAD_ACCESS
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// Try to determine endianness:
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#if ( \
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defined(__i386__) || defined(__alpha__) || \
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defined(__ia64) || defined(__ia64__) || \
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defined(_M_IX86) || defined(_M_IA64) || \
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defined(_M_ALPHA) || defined(__amd64) || \
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defined(__amd64__) || defined(_M_AMD64) || \
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defined(__x86_64) || defined(__x86_64__) || \
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defined(_M_X64) || defined(__bfin__) || \
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defined(__ARMEL__) || defined(__AARCH64EL__) || \
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(defined(_WIN32) && defined(__ARM__) && defined(_MSC_VER)) \
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)
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#define IS_LITTLE_ENDIAN
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#elif ( \
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defined (__ARMEB__) || defined(__sparc) || defined(__powerpc__) || defined(__POWERPC__) \
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)
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#define IS_BIG_ENDIAN
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#else
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#error Cannot determine endianness of this platform
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#endif
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// If a string sent over the protocol is larger than this, a warning is emitted to the console
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#define MAX_STRING_SIZE (512 KiB)
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#define NEEDBYTES(Num) if (!CanReadBytes(Num)) return false; // Check if at least Num bytes can be read from the buffer, return false if not
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#define PUTBYTES(Num) if (!CanWriteBytes(Num)) return false; // Check if at least Num bytes can be written to the buffer, return false if not
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#ifdef DEBUG_SINGLE_THREAD_ACCESS
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/** Simple RAII class that is used for checking that no two threads are using an object simultanously.
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It requires the monitored object to provide the storage for a thread ID.
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It uses that storage to check if the thread ID of consecutive calls is the same all the time. */
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class cSingleThreadAccessChecker
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{
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public:
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cSingleThreadAccessChecker(std::thread::id * a_ThreadID) :
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m_ThreadID(a_ThreadID)
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{
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ASSERT(
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(*a_ThreadID == std::this_thread::get_id()) || // Either the object is used by current thread...
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(*a_ThreadID == m_EmptyThreadID) // ... or by no thread at all
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);
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// Mark as being used by this thread:
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*m_ThreadID = std::this_thread::get_id();
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}
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~cSingleThreadAccessChecker()
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{
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// Mark as not being used by any thread:
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*m_ThreadID = std::thread::id();
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}
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protected:
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/** Points to the storage used for ID of the thread using the object. */
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std::thread::id * m_ThreadID;
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/** The value of an unassigned thread ID, used to speed up checking. */
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static std::thread::id m_EmptyThreadID;
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};
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std::thread::id cSingleThreadAccessChecker::m_EmptyThreadID;
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#define CHECK_THREAD cSingleThreadAccessChecker Checker(&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(size_t 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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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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m_Buffer = nullptr;
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}
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bool cByteBuffer::Write(const void * a_Bytes, size_t 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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size_t CurFreeSpace = GetFreeSpace();
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#ifdef _DEBUG
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size_t CurReadableSpace = GetReadableSpace();
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#endif
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size_t WrittenBytes = 0;
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if (CurFreeSpace < a_Count)
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{
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return false;
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}
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ASSERT(m_BufferSize >= m_WritePos);
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size_t TillEnd = m_BufferSize - m_WritePos;
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const char * Bytes = reinterpret_cast<const char *>(a_Bytes);
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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, Bytes, TillEnd);
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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, 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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size_t 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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ASSERT(m_BufferSize >= m_WritePos);
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ASSERT((m_BufferSize - m_WritePos + m_DataStart) >= 1);
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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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ASSERT(m_BufferSize >= m_WritePos);
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ASSERT(m_BufferSize - m_WritePos >= 1);
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return m_DataStart - m_WritePos - 1;
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}
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size_t cByteBuffer::GetUsedSpace(void) const
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{
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CHECK_THREAD
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CheckValid();
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ASSERT(m_BufferSize >= GetFreeSpace());
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ASSERT((m_BufferSize - GetFreeSpace()) >= 1);
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return m_BufferSize - GetFreeSpace() - 1;
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}
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size_t 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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ASSERT(m_BufferSize >= m_ReadPos);
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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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ASSERT(m_WritePos >= m_ReadPos);
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return m_WritePos - m_ReadPos;
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}
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bool cByteBuffer::CanReadBytes(size_t 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(size_t 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::ReadBEInt8(Int8 & 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::ReadBEUInt8(UInt8 & 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::ReadBEInt16(Int16 & 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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UInt16 val;
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ReadBuf(&val, 2);
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val = ntohs(val);
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memcpy(&a_Value, &val, 2);
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return true;
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}
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bool cByteBuffer::ReadBEUInt16(UInt16 & 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::ReadBEInt32(Int32 & 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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UInt32 val;
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ReadBuf(&val, 4);
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val = ntohl(val);
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memcpy(&a_Value, &val, 4);
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return true;
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}
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bool cByteBuffer::ReadBEUInt32(UInt32 & 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::ReadBEUInt64(UInt64 & 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 = NetworkToHostULong8(&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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UInt8 Value = 0;
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ReadBuf(&Value, 1);
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a_Value = (Value != 0);
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return true;
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}
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bool cByteBuffer::ReadVarInt32(UInt32 & a_Value)
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{
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CHECK_THREAD
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CheckValid();
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UInt32 Value = 0;
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int Shift = 0;
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unsigned char b = 0;
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do
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{
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NEEDBYTES(1);
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ReadBuf(&b, 1);
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Value = Value | ((static_cast<UInt32>(b & 0x7f)) << Shift);
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Shift += 7;
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} while ((b & 0x80) != 0);
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a_Value = Value;
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return true;
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}
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bool cByteBuffer::ReadVarInt64(UInt64 & a_Value)
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{
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CHECK_THREAD
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CheckValid();
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UInt64 Value = 0;
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int Shift = 0;
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unsigned char b = 0;
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do
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{
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NEEDBYTES(1);
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ReadBuf(&b, 1);
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Value = Value | ((static_cast<UInt64>(b & 0x7f)) << Shift);
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Shift += 7;
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} while ((b & 0x80) != 0);
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a_Value = Value;
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return true;
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}
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bool cByteBuffer::ReadVarUTF8String(AString & a_Value)
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{
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CHECK_THREAD
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CheckValid();
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UInt32 Size = 0;
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if (!ReadVarInt(Size))
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{
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return false;
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}
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if (Size > MAX_STRING_SIZE)
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{
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LOGWARNING("%s: String too large: %u (%u KiB)", __FUNCTION__, Size, Size / 1024);
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}
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return ReadString(a_Value, static_cast<size_t>(Size));
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}
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bool cByteBuffer::ReadLEInt(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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#ifdef IS_BIG_ENDIAN
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// Convert:
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a_Value = ((a_Value >> 24) & 0xff) | ((a_Value >> 16) & 0xff00) | ((a_Value >> 8) & 0xff0000) | (a_Value & 0xff000000);
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#endif
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return true;
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}
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bool cByteBuffer::ReadPosition64(int & a_BlockX, int & a_BlockY, int & a_BlockZ)
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{
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CHECK_THREAD
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Int64 Value;
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if (!ReadBEInt64(Value))
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{
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return false;
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}
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// Convert the 64 received bits into 3 coords:
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UInt32 BlockXRaw = (Value >> 38) & 0x03ffffff; // Top 26 bits
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UInt32 BlockYRaw = (Value >> 26) & 0x0fff; // Middle 12 bits
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UInt32 BlockZRaw = (Value & 0x03ffffff); // Bottom 26 bits
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// If the highest bit in the number's range is set, convert the number into negative:
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a_BlockX = ((BlockXRaw & 0x02000000) == 0) ? static_cast<int>(BlockXRaw) : -(0x04000000 - static_cast<int>(BlockXRaw));
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a_BlockY = ((BlockYRaw & 0x0800) == 0) ? static_cast<int>(BlockYRaw) : -(0x0800 - static_cast<int>(BlockYRaw));
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a_BlockZ = ((BlockZRaw & 0x02000000) == 0) ? static_cast<int>(BlockZRaw) : -(0x04000000 - static_cast<int>(BlockZRaw));
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return true;
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}
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bool cByteBuffer::WriteBEInt8(Int8 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::WriteBEUInt8(UInt8 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::WriteBEInt16(Int16 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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UInt16 val;
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memcpy(&val, &a_Value, 2);
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val = htons(val);
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return WriteBuf(&val, 2);
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}
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bool cByteBuffer::WriteBEUInt16(UInt16 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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a_Value = htons(a_Value);
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return WriteBuf(&a_Value, 2);
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}
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bool cByteBuffer::WriteBEInt32(Int32 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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UInt32 Converted = HostToNetwork4(&a_Value);
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return WriteBuf(&Converted, 4);
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}
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bool cByteBuffer::WriteBEUInt32(UInt32 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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UInt32 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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UInt64 Converted = HostToNetwork8(&a_Value);
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return WriteBuf(&Converted, 8);
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}
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bool cByteBuffer::WriteBEUInt64(UInt64 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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UInt64 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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UInt32 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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UInt64 Converted = HostToNetwork8(&a_Value);
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return WriteBuf(&Converted, 8);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::WriteBool(bool a_Value)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
UInt8 val = a_Value ? 1 : 0;
|
|
return Write(&val, 1);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::WriteVarInt32(UInt32 a_Value)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
|
|
// A 32-bit integer can be encoded by at most 5 bytes:
|
|
unsigned char b[5];
|
|
size_t idx = 0;
|
|
do
|
|
{
|
|
b[idx] = (a_Value & 0x7f) | ((a_Value > 0x7f) ? 0x80 : 0x00);
|
|
a_Value = a_Value >> 7;
|
|
idx++;
|
|
} while (a_Value > 0);
|
|
|
|
return WriteBuf(b, idx);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::WriteVarInt64(UInt64 a_Value)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
|
|
// A 64-bit integer can be encoded by at most 10 bytes:
|
|
unsigned char b[10];
|
|
size_t idx = 0;
|
|
do
|
|
{
|
|
b[idx] = (a_Value & 0x7f) | ((a_Value > 0x7f) ? 0x80 : 0x00);
|
|
a_Value = a_Value >> 7;
|
|
idx++;
|
|
} while (a_Value > 0);
|
|
|
|
return WriteBuf(b, idx);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::WriteVarUTF8String(const AString & a_Value)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
PUTBYTES(a_Value.size() + 1); // This is a lower-bound on the bytes that will be actually written. Fail early.
|
|
bool res = WriteVarInt32(static_cast<UInt32>(a_Value.size()));
|
|
if (!res)
|
|
{
|
|
return false;
|
|
}
|
|
return WriteBuf(a_Value.data(), a_Value.size());
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::WriteLEInt32(Int32 a_Value)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
#ifdef IS_LITTLE_ENDIAN
|
|
return WriteBuf(reinterpret_cast<const char *>(&a_Value), 4);
|
|
#else
|
|
int Value = ((a_Value >> 24) & 0xff) | ((a_Value >> 16) & 0xff00) | ((a_Value >> 8) & 0xff0000) | (a_Value & 0xff000000);
|
|
return WriteBuf(reinterpret_cast<const char *>(&Value), 4);
|
|
#endif
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::WritePosition64(Int32 a_BlockX, Int32 a_BlockY, Int32 a_BlockZ)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
return WriteBEInt64(
|
|
(static_cast<Int64>(a_BlockX & 0x3FFFFFF) << 38) |
|
|
(static_cast<Int64>(a_BlockY & 0xFFF) << 26) |
|
|
(static_cast<Int64>(a_BlockZ & 0x3FFFFFF))
|
|
);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::ReadBuf(void * a_Buffer, size_t a_Count)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
NEEDBYTES(a_Count);
|
|
char * Dst = reinterpret_cast<char *>(a_Buffer); // So that we can do byte math
|
|
ASSERT(m_BufferSize >= m_ReadPos);
|
|
size_t BytesToEndOfBuffer = m_BufferSize - m_ReadPos;
|
|
if (BytesToEndOfBuffer <= a_Count)
|
|
{
|
|
// Reading across the ringbuffer end, read the first part and adjust parameters:
|
|
if (BytesToEndOfBuffer > 0)
|
|
{
|
|
memcpy(Dst, m_Buffer + m_ReadPos, BytesToEndOfBuffer);
|
|
Dst += BytesToEndOfBuffer;
|
|
a_Count -= BytesToEndOfBuffer;
|
|
}
|
|
m_ReadPos = 0;
|
|
}
|
|
|
|
// Read the rest of the bytes in a single read (guaranteed to fit):
|
|
if (a_Count > 0)
|
|
{
|
|
memcpy(Dst, m_Buffer + m_ReadPos, a_Count);
|
|
m_ReadPos += a_Count;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::WriteBuf(const void * a_Buffer, size_t a_Count)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
PUTBYTES(a_Count);
|
|
char * Src = reinterpret_cast<char *>(const_cast<void*>(a_Buffer)); // So that we can do byte math
|
|
ASSERT(m_BufferSize >= m_ReadPos);
|
|
size_t BytesToEndOfBuffer = m_BufferSize - m_WritePos;
|
|
if (BytesToEndOfBuffer <= a_Count)
|
|
{
|
|
// Reading across the ringbuffer end, read the first part and adjust parameters:
|
|
memcpy(m_Buffer + m_WritePos, Src, BytesToEndOfBuffer);
|
|
Src += BytesToEndOfBuffer;
|
|
a_Count -= BytesToEndOfBuffer;
|
|
m_WritePos = 0;
|
|
}
|
|
|
|
// Read the rest of the bytes in a single read (guaranteed to fit):
|
|
if (a_Count > 0)
|
|
{
|
|
memcpy(m_Buffer + m_WritePos, Src, a_Count);
|
|
m_WritePos += a_Count;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::ReadString(AString & a_String, size_t a_Count)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
NEEDBYTES(a_Count);
|
|
a_String.clear();
|
|
a_String.reserve(a_Count);
|
|
ASSERT(m_BufferSize >= m_ReadPos);
|
|
size_t BytesToEndOfBuffer = m_BufferSize - m_ReadPos;
|
|
if (BytesToEndOfBuffer <= a_Count)
|
|
{
|
|
// Reading across the ringbuffer end, read the first part and adjust parameters:
|
|
if (BytesToEndOfBuffer > 0)
|
|
{
|
|
a_String.assign(m_Buffer + m_ReadPos, BytesToEndOfBuffer);
|
|
ASSERT(a_Count >= BytesToEndOfBuffer);
|
|
a_Count -= BytesToEndOfBuffer;
|
|
}
|
|
m_ReadPos = 0;
|
|
}
|
|
|
|
// Read the rest of the bytes in a single read (guaranteed to fit):
|
|
if (a_Count > 0)
|
|
{
|
|
a_String.append(m_Buffer + m_ReadPos, a_Count);
|
|
m_ReadPos += a_Count;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::SkipRead(size_t a_Count)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
if (!CanReadBytes(a_Count))
|
|
{
|
|
return false;
|
|
}
|
|
AdvanceReadPos(a_Count);
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cByteBuffer::ReadAll(AString & a_Data)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
ReadString(a_Data, GetReadableSpace());
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool cByteBuffer::ReadToByteBuffer(cByteBuffer & a_Dst, size_t a_NumBytes)
|
|
{
|
|
CHECK_THREAD
|
|
if (!a_Dst.CanWriteBytes(a_NumBytes) || !CanReadBytes(a_NumBytes))
|
|
{
|
|
// There's not enough source bytes or space in the dest BB
|
|
return false;
|
|
}
|
|
char buf[1024];
|
|
// > 0 without generating warnings about unsigned comparisons where size_t is unsigned
|
|
while (a_NumBytes != 0)
|
|
{
|
|
size_t num = (a_NumBytes > sizeof(buf)) ? sizeof(buf) : a_NumBytes;
|
|
VERIFY(ReadBuf(buf, num));
|
|
VERIFY(a_Dst.Write(buf, num));
|
|
ASSERT(a_NumBytes >= num);
|
|
a_NumBytes -= num;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cByteBuffer::CommitRead(void)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
m_DataStart = m_ReadPos;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cByteBuffer::ResetRead(void)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
m_ReadPos = m_DataStart;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cByteBuffer::ReadAgain(AString & a_Out)
|
|
{
|
|
// Return the data between m_DataStart and m_ReadPos (the data that has been read but not committed)
|
|
// Used by ProtoProxy to repeat communication twice, once for parsing and the other time for the remote party
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
size_t DataStart = m_DataStart;
|
|
if (m_ReadPos < m_DataStart)
|
|
{
|
|
// Across the ringbuffer end, read the first part and adjust next part's start:
|
|
ASSERT(m_BufferSize >= m_DataStart);
|
|
a_Out.append(m_Buffer + m_DataStart, m_BufferSize - m_DataStart);
|
|
DataStart = 0;
|
|
}
|
|
ASSERT(m_ReadPos >= DataStart);
|
|
a_Out.append(m_Buffer + DataStart, m_ReadPos - DataStart);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cByteBuffer::AdvanceReadPos(size_t a_Count)
|
|
{
|
|
CHECK_THREAD
|
|
CheckValid();
|
|
m_ReadPos += a_Count;
|
|
if (m_ReadPos >= m_BufferSize)
|
|
{
|
|
m_ReadPos -= m_BufferSize;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void cByteBuffer::CheckValid(void) const
|
|
{
|
|
ASSERT(m_ReadPos < m_BufferSize);
|
|
ASSERT(m_WritePos < m_BufferSize);
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
size_t cByteBuffer::GetVarIntSize(UInt32 a_Value)
|
|
{
|
|
size_t Count = 0;
|
|
|
|
do
|
|
{
|
|
// If the value cannot be expressed in 7 bits, it needs to take up another byte
|
|
Count++;
|
|
a_Value >>= 7;
|
|
} while (a_Value != 0);
|
|
|
|
return Count;
|
|
}
|
|
|
|
|
|
|
|
|
|
|