| 0,0 → 1,131 |
|---|
| #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; |
| } |
| |