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106 lines
2.3 KiB
C++
106 lines
2.3 KiB
C++
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#include "MemoryInputStream.h"
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#include <memory.h>
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#include <stdlib.h>
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MemoryInputStream::MemoryInputStream(void) : m_pData(NULL), m_DataLen(0), m_ReadPos(0) {}
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MemoryInputStream::MemoryInputStream(uchar* pData, int nLength) : m_pData(pData), m_DataLen(0), m_ReadPos(0) {}
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MemoryInputStream::~MemoryInputStream(void) {}
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void MemoryInputStream::setSource(uchar* pData, int nLength)
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{
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m_pData = pData;
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m_DataLen = nLength;
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m_ReadPos = 0;
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}
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void MemoryInputStream::seekStart(bool& success)
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{
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m_ReadPos = 0;
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success = (m_pData != NULL);
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}
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void MemoryInputStream::seekRelative(int count, bool& success)
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{
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int newPos = m_ReadPos + count;
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if( m_pData != NULL && newPos >= 0 && newPos <= m_DataLen )
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{
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m_ReadPos = newPos;
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success = true;
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}
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else
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{
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success = false;
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}
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}
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void MemoryInputStream::seekEnd(bool& success)
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{
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m_ReadPos = m_DataLen;
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success = (m_pData != NULL);
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}
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int MemoryInputStream::getAvailable(bool& success)
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{
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success = (m_pData != NULL && m_ReadPos != m_DataLen);
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return m_DataLen - m_ReadPos;
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}
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uchar MemoryInputStream::readUChar(bool& success)
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{
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if( m_pData != NULL && m_ReadPos != m_DataLen )
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{
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success = true;
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uchar val = m_pData[m_ReadPos];
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++m_ReadPos;
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return val;
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}
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success = false;
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return 0;
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}
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void MemoryInputStream::readUChar(uchar* buf, int count, bool& success)
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{
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if( m_pData != NULL )
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{
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int diff = m_DataLen - m_ReadPos;
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int numToRead = count < diff ? count : diff;
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memcpy(buf,m_pData,numToRead);
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success = (numToRead == count);
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return;
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}
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success = false;
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}
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void MemoryInputStream::close(bool& success)
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{
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m_pData = NULL;
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m_DataLen = 0;
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m_ReadPos = 0;
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success = true;
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}
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/*
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#include "vgui_inputstream.h"
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class MemoryInputStream : public vgui::InputStream
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{
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public:
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MemoryInputStream();
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MemoryInputStream(uchar* pData, int nLength);
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virtual MemoryInputStream(void);
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virtual void setSource(uchar* pData, int nLength);
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virtual void seekStart(bool& success);
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virtual void seekRelative(int count, bool& success);
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virtual void seekEnd(bool& success);
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virtual int getAvailable(bool& success);
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virtual uchar readUChar(bool& success);
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virtual void readUChar(uchar* buf, int count, bool& success);
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virtual void close(bool& success);
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private:
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uchar* m_pData;
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int m_DataLen;
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int m_ReadPos;
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};
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*/
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