| 1 | /* |
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| 2 | * This file Copyright (C) Mnemosyne LLC |
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| 3 | * |
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| 4 | * This file is licensed by the GPL version 2. Works owned by the |
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| 5 | * Transmission project are granted a special exemption to clause 2(b) |
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| 6 | * so that the bulk of its code can remain under the MIT license. |
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| 7 | * This exemption does not extend to derived works not owned by |
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| 8 | * the Transmission project. |
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| 9 | * |
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| 10 | * $Id: inout.h 12204 2011-03-22 15:19:54Z jordan $ |
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| 11 | */ |
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| 12 | |
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| 13 | #ifndef __TRANSMISSION__ |
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| 14 | #error only libtransmission should #include this header. |
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| 15 | #endif |
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| 16 | |
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| 17 | #ifndef TR_IO_H |
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| 18 | #define TR_IO_H 1 |
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| 19 | |
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| 20 | struct tr_torrent; |
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| 21 | |
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| 22 | /** |
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| 23 | * @addtogroup file_io File IO |
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| 24 | * @{ |
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| 25 | */ |
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| 26 | |
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| 27 | /** |
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| 28 | * Reads the block specified by the piece index, offset, and length. |
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| 29 | * @return 0 on success, or an errno value on failure. |
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| 30 | */ |
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| 31 | int tr_ioRead( struct tr_torrent * tor, |
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| 32 | tr_piece_index_t pieceIndex, |
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| 33 | uint32_t offset, |
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| 34 | uint32_t len, |
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| 35 | uint8_t * setme ); |
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| 36 | |
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| 37 | int |
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| 38 | tr_ioPrefetch( tr_torrent * tor, |
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| 39 | tr_piece_index_t pieceIndex, |
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| 40 | uint32_t begin, |
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| 41 | uint32_t len ); |
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| 42 | |
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| 43 | /** |
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| 44 | * Writes the block specified by the piece index, offset, and length. |
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| 45 | * @return 0 on success, or an errno value on failure. |
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| 46 | */ |
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| 47 | int tr_ioWrite( struct tr_torrent * tor, |
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| 48 | tr_piece_index_t pieceIndex, |
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| 49 | uint32_t offset, |
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| 50 | uint32_t len, |
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| 51 | const uint8_t * writeme ); |
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| 52 | |
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| 53 | /** |
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| 54 | * @brief Test to see if the piece matches its metainfo's SHA1 checksum. |
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| 55 | */ |
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| 56 | bool tr_ioTestPiece( tr_torrent * tor, |
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| 57 | tr_piece_index_t piece ); |
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| 58 | |
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| 59 | |
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| 60 | /** |
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| 61 | * Converts a piece index + offset into a file index + offset. |
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| 62 | */ |
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| 63 | void tr_ioFindFileLocation( const tr_torrent * tor, |
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| 64 | tr_piece_index_t pieceIndex, |
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| 65 | uint32_t pieceOffset, |
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| 66 | tr_file_index_t * fileIndex, |
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| 67 | uint64_t * fileOffset ); |
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| 68 | |
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| 69 | |
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| 70 | /* @} */ |
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| 71 | #endif |
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