mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-20 22:02:34 +03:00
132 lines
2.2 KiB
C++
132 lines
2.2 KiB
C++
#include "kosSyst.h"
|
|
#include "kosfile.h"
|
|
|
|
|
|
CKosFile::CKosFile(char *fileName)
|
|
{
|
|
//
|
|
this->fileInfo.bufferPtr = new Byte[FILE_BUFFER_SIZE];
|
|
//
|
|
this->filePointer = 0;
|
|
this->bufferPointer = 0;
|
|
this->validBuffer = false;
|
|
//
|
|
strcpy( this->fileInfo.fileURL, fileName );
|
|
}
|
|
|
|
|
|
CKosFile::~CKosFile(void)
|
|
{
|
|
//
|
|
delete this->fileInfo.bufferPtr;
|
|
}
|
|
|
|
|
|
void CKosFile::ValidateBuffer()
|
|
{
|
|
//
|
|
if ( this->validBuffer )
|
|
{
|
|
//
|
|
if ( this->filePointer < this->bufferPointer
|
|
|| this->filePointer >= (this->bufferPointer + FILE_BUFFER_SIZE) )
|
|
{
|
|
//
|
|
this->validBuffer = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void CKosFile::UpdateBuffer(void)
|
|
{
|
|
//
|
|
if ( ! this->validBuffer )
|
|
{
|
|
//
|
|
this->fileInfo.OffsetLow = this->filePointer / OS_BLOCK_SIZE;
|
|
this->fileInfo.OffsetHigh = 0;
|
|
//
|
|
this->bufferPointer = this->fileInfo.OffsetLow * OS_BLOCK_SIZE;
|
|
//
|
|
this->fileInfo.dataCount = FILE_BUFFER_BLOCKS;
|
|
//
|
|
this->fileInfo.rwMode = 0;
|
|
//
|
|
Dword rr = kos_FileSystemAccess( &(this->fileInfo) );
|
|
this->validBuffer = ( rr == 0 );
|
|
}
|
|
}
|
|
|
|
|
|
int CKosFile::Seek(int seekFrom, int seekStep)
|
|
{
|
|
//
|
|
switch ( seekFrom )
|
|
{
|
|
//
|
|
case SEEK_SET:
|
|
//
|
|
this->filePointer = seekStep;
|
|
break;
|
|
//
|
|
case SEEK_CUR:
|
|
//
|
|
this->filePointer += seekStep;
|
|
break;
|
|
}
|
|
//
|
|
this->ValidateBuffer();
|
|
//
|
|
return this->filePointer;
|
|
}
|
|
|
|
|
|
int CKosFile::Read(Byte *targetPtr, int readCount)
|
|
{
|
|
int bufferLeast, result;
|
|
|
|
//
|
|
result = 0;
|
|
//
|
|
do
|
|
{
|
|
//
|
|
this->UpdateBuffer();
|
|
//
|
|
if ( ! this->validBuffer ) return result;
|
|
//
|
|
bufferLeast = FILE_BUFFER_SIZE - (this->filePointer - this->bufferPointer);
|
|
//
|
|
if ( bufferLeast > readCount ) bufferLeast = readCount;
|
|
//
|
|
if ( bufferLeast )
|
|
{
|
|
//
|
|
memcpy(
|
|
targetPtr,
|
|
this->fileInfo.bufferPtr + (this->filePointer - this->bufferPointer),
|
|
bufferLeast
|
|
);
|
|
//
|
|
targetPtr += bufferLeast;
|
|
readCount -= bufferLeast;
|
|
this->filePointer += bufferLeast;
|
|
//
|
|
result += bufferLeast;
|
|
}
|
|
//
|
|
this->ValidateBuffer();
|
|
}
|
|
while ( readCount > 0 );
|
|
//
|
|
return result;
|
|
}
|
|
|
|
|
|
int CKosFile::Write(Byte *sourcePtr, int writeCount)
|
|
{
|
|
return 0;
|
|
}
|
|
|