132 lines
2.2 KiB
C++
132 lines
2.2 KiB
C++
#include "kosSyst.h"
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#include "kosfile.h"
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CKosFile::CKosFile(char *fileName)
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{
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//
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this->fileInfo.bufferPtr = new Byte[FILE_BUFFER_SIZE];
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//
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this->filePointer = 0;
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this->bufferPointer = 0;
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this->validBuffer = false;
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//
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strcpy( this->fileInfo.fileURL, fileName );
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}
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CKosFile::~CKosFile(void)
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{
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//
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delete this->fileInfo.bufferPtr;
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}
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void CKosFile::ValidateBuffer()
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{
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//
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if ( this->validBuffer )
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{
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//
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if ( this->filePointer < this->bufferPointer
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|| this->filePointer >= (this->bufferPointer + FILE_BUFFER_SIZE) )
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{
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//
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this->validBuffer = false;
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}
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}
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}
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void CKosFile::UpdateBuffer(void)
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{
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//
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if ( ! this->validBuffer )
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{
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//
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this->fileInfo.OffsetLow = this->filePointer / OS_BLOCK_SIZE;
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this->fileInfo.OffsetHigh = 0;
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//
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this->bufferPointer = this->fileInfo.OffsetLow * OS_BLOCK_SIZE;
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//
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this->fileInfo.dataCount = FILE_BUFFER_BLOCKS;
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//
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this->fileInfo.rwMode = 0;
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//
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Dword rr = kos_FileSystemAccess( &(this->fileInfo) );
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this->validBuffer = ( rr == 0 ) || ( rr == 6 );
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}
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}
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int CKosFile::Seek(int seekFrom, int seekStep)
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{
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//
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switch ( seekFrom )
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{
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//
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case SEEK_SET:
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//
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this->filePointer = seekStep;
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break;
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//
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case SEEK_CUR:
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//
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this->filePointer += seekStep;
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break;
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}
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//
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this->ValidateBuffer();
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//
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return this->filePointer;
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}
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int CKosFile::Read(Byte *targetPtr, int readCount)
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{
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int bufferLeast, result;
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//
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result = 0;
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//
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do
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{
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//
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this->UpdateBuffer();
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//
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if ( ! this->validBuffer ) return result;
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//
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bufferLeast = FILE_BUFFER_SIZE - (this->filePointer - this->bufferPointer);
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//
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if ( bufferLeast > readCount ) bufferLeast = readCount;
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//
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if ( bufferLeast )
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{
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//
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memcpy(
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targetPtr,
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this->fileInfo.bufferPtr + (this->filePointer - this->bufferPointer),
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bufferLeast
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);
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//
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targetPtr += bufferLeast;
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readCount -= bufferLeast;
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this->filePointer += bufferLeast;
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//
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result += bufferLeast;
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}
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//
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this->ValidateBuffer();
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}
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while ( readCount > 0 );
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//
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return result;
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}
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int CKosFile::Write(Byte *sourcePtr, int writeCount)
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{
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return 0;
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}
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