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#include "xmemfile.h"
//////////////////////////////////////////////////////////
CxMemFile::CxMemFile(uint8_t* pBuffer, uint32_t size)
{
m_pBuffer = pBuffer;
m_Position = 0;
m_Size = m_Edge = size;
m_bFreeOnClose = (bool)(pBuffer==0);
m_bEOF = false;
}
//////////////////////////////////////////////////////////
CxMemFile::~CxMemFile()
{
Close();
}
//////////////////////////////////////////////////////////
bool CxMemFile::Close()
{
if ( (m_pBuffer) && (m_bFreeOnClose) ){
free(m_pBuffer);
m_pBuffer = NULL;
m_Size = 0;
}
return true;
}
//////////////////////////////////////////////////////////
bool CxMemFile::Open()
{
if (m_pBuffer) return false; // Can't re-open without closing first
m_Position = m_Size = m_Edge = 0;
m_pBuffer=(uint8_t*)malloc(1);
m_bFreeOnClose = true;
return (m_pBuffer!=0);
}
//////////////////////////////////////////////////////////
uint8_t* CxMemFile::GetBuffer(bool bDetachBuffer)
{
//can only detach, avoid inadvertantly attaching to
// memory that may not be ours [Jason De Arte]
if( bDetachBuffer )
m_bFreeOnClose = false;
return m_pBuffer;
}
//////////////////////////////////////////////////////////
size_t CxMemFile::Read(void *buffer, size_t size, size_t count)
{
if (buffer==NULL) return 0;
if (m_pBuffer==NULL) return 0;
if (m_Position >= (int32_t)m_Size){
m_bEOF = true;
return 0;
}
int32_t nCount = (int32_t)(count*size);
if (nCount == 0) return 0;
int32_t nRead;
if (m_Position + nCount > (int32_t)m_Size){
m_bEOF = true;
nRead = (m_Size - m_Position);
} else
nRead = nCount;
memcpy(buffer, m_pBuffer + m_Position, nRead);
m_Position += nRead;
return (size_t)(nRead/size);
}
//////////////////////////////////////////////////////////
size_t CxMemFile::Write(const void *buffer, size_t size, size_t count)
{
m_bEOF = false;
if (m_pBuffer==NULL) return 0;
if (buffer==NULL) return 0;
int32_t nCount = (int32_t)(count*size);
if (nCount == 0) return 0;
if (m_Position + nCount > m_Edge){
if (!Alloc(m_Position + nCount)){
return false;
}
}
memcpy(m_pBuffer + m_Position, buffer, nCount);
m_Position += nCount;
if (m_Position > (int32_t)m_Size) m_Size = m_Position;
return count;
}
//////////////////////////////////////////////////////////
bool CxMemFile::Seek(int32_t offset, int32_t origin)
{
m_bEOF = false;
if (m_pBuffer==NULL) return false;
int32_t lNewPos = m_Position;
if (origin == SEEK_SET) lNewPos = offset;
else if (origin == SEEK_CUR) lNewPos += offset;
else if (origin == SEEK_END) lNewPos = m_Size + offset;
else return false;
if (lNewPos < 0) lNewPos = 0;
m_Position = lNewPos;
return true;
}
//////////////////////////////////////////////////////////
int32_t CxMemFile::Tell()
{
if (m_pBuffer==NULL) return -1;
return m_Position;
}
//////////////////////////////////////////////////////////
int32_t CxMemFile::Size()
{
if (m_pBuffer==NULL) return -1;
return m_Size;
}
//////////////////////////////////////////////////////////
bool CxMemFile::Flush()
{
if (m_pBuffer==NULL) return false;
return true;
}
//////////////////////////////////////////////////////////
bool CxMemFile::Eof()
{
if (m_pBuffer==NULL) return true;
return m_bEOF;
}
//////////////////////////////////////////////////////////
int32_t CxMemFile::Error()
{
if (m_pBuffer==NULL) return -1;
return (m_Position > (int32_t)m_Size);
}
//////////////////////////////////////////////////////////
bool CxMemFile::PutC(uint8_t c)
{
m_bEOF = false;
if (m_pBuffer==NULL) return false;
if (m_Position >= m_Edge){
if (!Alloc(m_Position + 1)){
return false;
}
}
m_pBuffer[m_Position++] = c;
if (m_Position > (int32_t)m_Size) m_Size = m_Position;
return true;
}
//////////////////////////////////////////////////////////
int32_t CxMemFile::GetC()
{
if (m_pBuffer==NULL || m_Position >= (int32_t)m_Size){
m_bEOF = true;
return EOF;
}
return *(uint8_t*)((uint8_t*)m_pBuffer + m_Position++);
}
//////////////////////////////////////////////////////////
char * CxMemFile::GetS(char *string, int32_t n)
{
n--;
int32_t c,i=0;
while (i<n){
c = GetC();
if (c == EOF) return 0;
string[i++] = (char)c;
if (c == '\n') break;
}
string[i] = 0;
return string;
}
//////////////////////////////////////////////////////////
int32_t CxMemFile::Scanf(const char *format, void* output)
{
return 0;
}
//////////////////////////////////////////////////////////
bool CxMemFile::Alloc(uint32_t dwNewLen)
{
if (dwNewLen > (uint32_t)m_Edge)
{
// find new buffer size
uint32_t dwNewBufferSize = (uint32_t)(((dwNewLen>>16)+1)<<16);
// allocate new buffer
if (m_pBuffer == NULL) m_pBuffer = (uint8_t*)malloc(dwNewBufferSize);
else m_pBuffer = (uint8_t*)realloc(m_pBuffer, dwNewBufferSize);
// I own this buffer now (caller knows nothing about it)
m_bFreeOnClose = true;
m_Edge = dwNewBufferSize;
}
return (m_pBuffer!=0);
}
//////////////////////////////////////////////////////////
void CxMemFile::Free()
{
Close();
}
//////////////////////////////////////////////////////////
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