mirror of
https://github.com/transmission/transmission
synced 2024-12-26 09:37:56 +00:00
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* This file Copyright (C) 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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/** @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 alloc_count;
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size_t bit_count;
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size_t true_count;
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/* Special cases for when full or empty but we don't know the bitCount.
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This occurs when a magnet link's peers send have all / have none */
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bool have_all_hint;
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bool have_none_hint;
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}
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tr_bitfield;
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/***
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****
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***/
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void tr_bitfieldSetHasAll( tr_bitfield* );
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void tr_bitfieldSetHasNone( tr_bitfield* );
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void tr_bitfieldAdd( tr_bitfield*, size_t bit );
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void tr_bitfieldRem( tr_bitfield*, size_t bit );
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void tr_bitfieldAddRange( tr_bitfield*, size_t begin, size_t end );
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void tr_bitfieldRemRange( tr_bitfield*, size_t begin, size_t end );
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/***
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**** life cycle
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***/
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extern const tr_bitfield TR_BITFIELD_INIT;
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void tr_bitfieldConstruct( tr_bitfield*, size_t bit_count );
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static inline void
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tr_bitfieldDestruct( tr_bitfield * b )
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{
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tr_bitfieldSetHasNone( b );
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}
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/***
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****
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***/
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void tr_bitfieldSetFromBitfield( tr_bitfield*, const tr_bitfield* );
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void tr_bitfieldSetRaw( tr_bitfield*, const void * bits, size_t byte_count );
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void* tr_bitfieldGetRaw( const tr_bitfield * b, size_t * byte_count );
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/***
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****
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***/
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size_t tr_bitfieldCountRange( const tr_bitfield*, size_t begin, size_t end );
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size_t tr_bitfieldCountTrueBits( const tr_bitfield * b );
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static inline bool
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tr_bitfieldHasAll( const tr_bitfield * b )
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{
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return b->bit_count ? ( b->true_count == b->bit_count ) : b->have_all_hint;
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}
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static inline bool
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tr_bitfieldHasNone( const tr_bitfield * b )
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{
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return b->bit_count ? ( b->true_count == 0 ) : b->have_none_hint;
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}
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static inline bool
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tr_bitfieldHas( const tr_bitfield * b, size_t n )
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{
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if( tr_bitfieldHasAll( b ) ) return true;
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if( tr_bitfieldHasNone( b ) ) return false;
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if( n>>3u >= b->alloc_count ) return false;
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return ( b->bits[n>>3u] << ( n & 7u ) & 0x80 ) != 0;
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}
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#endif
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