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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1005 | barsuk | 1 | #include "kosSyst.h" |
| 2 | #include "kosfile.h" |
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| 3 | #include "string.h" |
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| 4 | |||
| 5 | |||
| 6 | CKosFile::CKosFile(char *fileName) |
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| 7 | { |
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| 8 | // |
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| 9 | this->fileInfo.bufferPtr = new Byte[FILE_BUFFER_SIZE]; |
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| 10 | // |
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| 11 | this->filePointer = 0; |
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| 12 | this->bufferPointer = 0; |
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| 13 | this->validBuffer = false; |
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| 14 | // |
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| 15 | strcpy( this->fileInfo.fileURL, fileName ); |
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| 16 | } |
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| 17 | |||
| 18 | |||
| 19 | CKosFile::~CKosFile(void) |
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| 20 | { |
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| 21 | // |
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| 22 | delete this->fileInfo.bufferPtr; |
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| 23 | } |
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| 24 | |||
| 25 | |||
| 26 | void CKosFile::ValidateBuffer() |
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| 27 | { |
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| 28 | // |
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| 29 | if ( this->validBuffer ) |
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| 30 | { |
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| 31 | // |
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| 32 | if ( this->filePointer < this->bufferPointer |
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| 33 | || this->filePointer >= (this->bufferPointer + FILE_BUFFER_SIZE) ) |
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| 34 | { |
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| 35 | // |
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| 36 | this->validBuffer = false; |
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| 37 | } |
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| 38 | } |
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| 39 | } |
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| 40 | |||
| 41 | |||
| 42 | void CKosFile::UpdateBuffer(void) |
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| 43 | { |
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| 44 | // |
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| 45 | if ( ! this->validBuffer ) |
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| 46 | { |
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| 47 | // |
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| 48 | this->fileInfo.OffsetLow = this->filePointer / OS_BLOCK_SIZE; |
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| 49 | this->fileInfo.OffsetHigh = 0; |
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| 50 | // |
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| 51 | this->bufferPointer = this->fileInfo.OffsetLow * OS_BLOCK_SIZE; |
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| 52 | // |
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| 53 | this->fileInfo.dataCount = FILE_BUFFER_BLOCKS; |
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| 54 | // |
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| 55 | this->fileInfo.rwMode = 0; |
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| 56 | // |
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| 57 | Dword rr = kos_FileSystemAccess( &(this->fileInfo) ); |
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| 58 | this->validBuffer = ( rr == 0 ); |
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| 59 | } |
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| 60 | } |
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| 61 | |||
| 62 | |||
| 63 | int CKosFile::Seek(int seekFrom, int seekStep) |
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| 64 | { |
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| 65 | // |
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| 66 | switch ( seekFrom ) |
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| 67 | { |
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| 68 | // |
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| 69 | case SEEK_SET: |
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| 70 | // |
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| 71 | this->filePointer = seekStep; |
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| 72 | break; |
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| 73 | // |
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| 74 | case SEEK_CUR: |
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| 75 | // |
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| 76 | this->filePointer += seekStep; |
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| 77 | break; |
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| 78 | } |
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| 79 | // |
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| 80 | this->ValidateBuffer(); |
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| 81 | // |
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| 82 | return this->filePointer; |
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| 83 | } |
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| 84 | |||
| 85 | |||
| 86 | int CKosFile::Read(Byte *targetPtr, int readCount) |
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| 87 | { |
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| 88 | int bufferLeast, result; |
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| 89 | |||
| 90 | // |
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| 91 | result = 0; |
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| 92 | // |
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| 93 | do |
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| 94 | { |
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| 95 | // |
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| 96 | this->UpdateBuffer(); |
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| 97 | // |
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| 98 | if ( ! this->validBuffer ) return result; |
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| 99 | // |
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| 100 | bufferLeast = FILE_BUFFER_SIZE - (this->filePointer - this->bufferPointer); |
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| 101 | // |
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| 102 | if ( bufferLeast > readCount ) bufferLeast = readCount; |
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| 103 | // |
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| 104 | if ( bufferLeast ) |
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| 105 | { |
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| 106 | // |
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| 107 | memcpy( |
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| 108 | targetPtr, |
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| 109 | this->fileInfo.bufferPtr + (this->filePointer - this->bufferPointer), |
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| 110 | bufferLeast |
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| 111 | ); |
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| 112 | // |
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| 113 | targetPtr += bufferLeast; |
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| 114 | readCount -= bufferLeast; |
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| 115 | this->filePointer += bufferLeast; |
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| 116 | // |
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| 117 | result += bufferLeast; |
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| 118 | } |
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| 119 | // |
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| 120 | this->ValidateBuffer(); |
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| 121 | } |
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| 122 | while ( readCount > 0 ); |
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| 123 | // |
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| 124 | return result; |
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| 125 | } |
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| 126 | |||
| 127 | |||
| 128 | int CKosFile::Write(Byte *sourcePtr, int writeCount) |
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| 129 | { |
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| 130 | return 0; |
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| 131 | } |
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| 132 |