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#include "lc_global.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include "lc_file.h"
lcMemFile::lcMemFile()
{
mGrowBytes = 1024;
mPosition = 0;
mBufferSize = 0;
mFileSize = 0;
mBuffer = nullptr;
}
lcMemFile::~lcMemFile()
{
Close();
}
void lcMemFile::Seek(qint64 Offset, int From)
{
if (From == SEEK_SET)
mPosition = Offset;
else if (From == SEEK_CUR)
mPosition += Offset;
else if (From == SEEK_END)
mPosition = mFileSize + Offset;
}
long lcMemFile::GetPosition() const
{
return (long)mPosition;
}
void lcMemFile::SetLength(size_t NewLength)
{
if (NewLength > mBufferSize)
GrowFile(NewLength);
if (NewLength < mPosition)
mPosition = NewLength;
mFileSize = NewLength;
}
size_t lcMemFile::GetLength() const
{
return mFileSize;
}
void lcMemFile::Close()
{
if (!mBuffer)
return;
mPosition = 0;
mBufferSize = 0;
mFileSize = 0;
free(mBuffer);
mBuffer = nullptr;
}
size_t lcMemFile::ReadBuffer(void* Buffer, size_t Bytes)
{
if (Bytes == 0 || mPosition > mFileSize)
return 0;
size_t BytesToRead;
if (mPosition + Bytes > mFileSize)
BytesToRead = mFileSize - mPosition;
else
BytesToRead = Bytes;
memcpy(Buffer, mBuffer + mPosition, BytesToRead);
mPosition += BytesToRead;
return BytesToRead;
}
size_t lcMemFile::WriteBuffer(const void* Buffer, size_t Bytes)
{
if (Bytes == 0)
return 0;
if (mPosition + Bytes > mBufferSize)
GrowFile(mPosition + Bytes);
memcpy(mBuffer + mPosition, Buffer, Bytes);
mPosition += Bytes;
if (mPosition > mFileSize)
mFileSize = mPosition;
return Bytes;
}
void lcMemFile::GrowFile(size_t NewLength)
{
if (NewLength <= mBufferSize)
return;
NewLength = ((NewLength + mGrowBytes - 1) / mGrowBytes) * mGrowBytes;
if (mBuffer)
{
unsigned char* NewBuffer = (unsigned char*)realloc(mBuffer, NewLength);
if (!NewBuffer)
return;
mBuffer = NewBuffer;
}
else
mBuffer = (unsigned char*)malloc(NewLength);
mBufferSize = NewLength;
}
char* lcMemFile::ReadLine(char* Buffer, size_t BufferSize)
{
int BytesRead = 0;
unsigned char ch;
if (BufferSize == 0)
return nullptr;
if (mPosition >= mFileSize)
return nullptr;
while ((--BufferSize))
{
if (mPosition == mFileSize)
break;
ch = mBuffer[mPosition];
mPosition++;
Buffer[BytesRead++] = ch;
if (ch == '\n')
break;
}
Buffer[BytesRead] = 0;
return Buffer;
}
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