mirror of
https://github.com/transmission/transmission
synced 2024-12-26 01:27:28 +00:00
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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* This file Copyright (C) 2009-2010 Mnemosyne LLC
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*
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* This file is licensed by the GPL version 2. Works owned by the
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* Transmission project are granted a special exemption to clause 2(b)
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* so that the bulk of its code can remain under the MIT license.
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* This exemption does not extend to derived works not owned by
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* the Transmission project.
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*
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* $Id$
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*/
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#ifndef __TRANSMISSION__
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#error only libtransmission should #include this header.
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#endif
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#ifndef TR_BITFIELD_H
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#define TR_BITFIELD_H 1
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#include "transmission.h"
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#include "utils.h" /* tr_new0 */
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/** @brief Implementation of the BitTorrent spec's Bitfield array of bits */
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typedef struct tr_bitfield
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{
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uint8_t * bits;
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size_t bitCount;
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size_t byteCount;
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}
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tr_bitfield;
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tr_bitfield* tr_bitfieldConstruct( tr_bitfield*, size_t bitcount );
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tr_bitfield* tr_bitfieldDestruct( tr_bitfield* );
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static inline tr_bitfield* tr_bitfieldNew( size_t bitcount )
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{
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return tr_bitfieldConstruct( tr_new0( tr_bitfield, 1 ), bitcount );
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}
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static inline void tr_bitfieldFree( tr_bitfield * b )
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{
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tr_free( tr_bitfieldDestruct( b ) );
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}
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tr_bitfield* tr_bitfieldDup( const tr_bitfield* ) TR_GNUC_MALLOC;
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void tr_bitfieldClear( tr_bitfield* );
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int tr_bitfieldAdd( tr_bitfield*, size_t bit );
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int tr_bitfieldRem( tr_bitfield*, size_t bit );
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int tr_bitfieldAddRange( tr_bitfield *, size_t begin, size_t end );
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int tr_bitfieldRemRange( tr_bitfield*, size_t begin, size_t end );
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void tr_bitfieldDifference( tr_bitfield *, const tr_bitfield * );
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int tr_bitfieldIsEmpty( const tr_bitfield* );
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size_t tr_bitfieldCountTrueBits( const tr_bitfield* );
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tr_bitfield* tr_bitfieldOr( tr_bitfield*, const tr_bitfield* );
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/** A stripped-down version of bitfieldHas to be used
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for speed when you're looping quickly. This version
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has none of tr_bitfieldHas()'s safety checks, so you
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need to call tr_bitfieldTestFast() first before you
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start looping. */
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static inline tr_bool tr_bitfieldHasFast( const tr_bitfield * b, const size_t nth )
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{
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return ( b->bits[nth>>3u] << ( nth & 7u ) & 0x80 ) != 0;
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}
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/** @param high the highest nth bit you're going to access */
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static inline tr_bool tr_bitfieldTestFast( const tr_bitfield * b, const size_t high )
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{
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return ( b != NULL )
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&& ( b->bits != NULL )
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&& ( high < b->bitCount );
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}
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static inline tr_bool tr_bitfieldHas( const tr_bitfield * b, size_t nth )
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{
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return tr_bitfieldTestFast( b, nth ) && tr_bitfieldHasFast( b, nth );
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}
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#endif
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