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transmission/libtransmission/completion.c

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/******************************************************************************
* $Id$
*
* Copyright (c) 2005 Transmission authors and contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*****************************************************************************/
#include "transmission.h"
#include "completion.h"
struct tr_completion_s
{
tr_torrent_t * tor;
/* number of peers from whom we've requested this block */
uint8_t * blockDownloaders;
/* do we have this block? */
tr_bitfield_t * blockBitfield;
/* do we have this piece? */
tr_bitfield_t * pieceBitfield;
/* a block is complete if and only if we have it */
int * completeBlocks;
/* rather than calculating these over and over again in loops,
just calculate them once */
int nBlocksInPiece;
int nBlocksInLastPiece;
};
#define tr_cpCountBlocks(cp,piece) (piece==cp->tor->info.pieceCount-1 \
? cp->nBlocksInLastPiece \
: cp->nBlocksInPiece)
tr_completion_t * tr_cpInit( tr_torrent_t * tor )
{
tr_completion_t * cp;
cp = tr_new( tr_completion_t, 1 );
cp->tor = tor;
cp->blockBitfield = tr_bitfieldNew( tor->blockCount );
cp->blockDownloaders = tr_new( uint8_t, tor->blockCount );
cp->pieceBitfield = tr_bitfieldNew( tor->info.pieceCount );
cp->completeBlocks = tr_new( int, tor->info.pieceCount );
cp->nBlocksInLastPiece = tr_pieceCountBlocks( tor->info.pieceCount - 1 );
cp->nBlocksInPiece = tor->info.pieceCount==1 ? cp->nBlocksInLastPiece
: tr_pieceCountBlocks( 0 );
tr_cpReset( cp );
return cp;
}
void tr_cpClose( tr_completion_t * cp )
{
tr_free( cp->completeBlocks );
tr_bitfieldFree( cp->pieceBitfield );
tr_free( cp->blockDownloaders );
tr_bitfieldFree( cp->blockBitfield );
tr_free( cp );
}
void tr_cpReset( tr_completion_t * cp )
{
tr_torrent_t * tor = cp->tor;
int i;
tr_bitfieldClear( cp->blockBitfield );
memset( cp->blockDownloaders, 0, tor->blockCount );
tr_bitfieldClear( cp->pieceBitfield );
for( i = 0; i < tor->info.pieceCount; ++i )
cp->completeBlocks[i] = 0;
}
int tr_cpPieceHasAllBlocks( const tr_completion_t * cp, int piece )
{
return tr_cpPieceIsComplete( cp, piece );
}
int tr_cpPieceIsComplete( const tr_completion_t * cp, int piece )
{
return tr_bitfieldHas( cp->pieceBitfield, piece );
}
const tr_bitfield_t * tr_cpPieceBitfield( const tr_completion_t * cp )
{
return cp->pieceBitfield;
}
void tr_cpPieceAdd( tr_completion_t * cp, int piece )
{
const tr_torrent_t * tor = cp->tor;
const int n_blocks = tr_cpCountBlocks( cp, piece );
const int startBlock = tr_pieceStartBlock( piece );
const int endBlock = startBlock + n_blocks;
cp->completeBlocks[piece] = n_blocks;
tr_bitfieldAddRange( cp->blockBitfield, startBlock, endBlock );
tr_bitfieldAdd( cp->pieceBitfield, piece );
}
void tr_cpPieceRem( tr_completion_t * cp, int piece )
{
const tr_torrent_t * tor = cp->tor;
const int n_blocks = tr_cpCountBlocks( cp, piece );
const int startBlock = tr_pieceStartBlock( piece );
const int endBlock = startBlock + n_blocks;
cp->completeBlocks[piece] = 0;
tr_bitfieldRemRange ( cp->blockBitfield, startBlock, endBlock );
tr_bitfieldRem( cp->pieceBitfield, piece );
}
/* Blocks */
void tr_cpDownloaderAdd( tr_completion_t * cp, int block )
{
++cp->blockDownloaders[block];
}
void tr_cpDownloaderRem( tr_completion_t * cp, int block )
{
--cp->blockDownloaders[block];
}
int tr_cpBlockIsComplete( const tr_completion_t * cp, int block )
{
return tr_bitfieldHas( cp->blockBitfield, block );
}
void tr_cpBlockAdd( tr_completion_t * cp, int block )
{
const tr_torrent_t * tor;
assert( cp != NULL );
assert( cp->tor != NULL );
assert( 0 <= block );
tor = cp->tor;
if( !tr_cpBlockIsComplete( cp, block ) )
{
const int piece = tr_blockPiece( block );
++cp->completeBlocks[piece];
if( cp->completeBlocks[piece] == tr_cpCountBlocks( cp, piece ) )
tr_bitfieldAdd( cp->pieceBitfield, piece );
tr_bitfieldAdd( cp->blockBitfield, block );
}
}
const tr_bitfield_t * tr_cpBlockBitfield( const tr_completion_t * cp )
{
assert( cp != NULL );
return cp->blockBitfield;
}
void
tr_cpBlockBitfieldSet( tr_completion_t * cp, tr_bitfield_t * bitfield )
{
int i;
assert( cp != NULL );
assert( bitfield != NULL );
tr_cpReset( cp );
for( i=0; i < cp->tor->blockCount; ++i )
if( tr_bitfieldHas( bitfield, i ) )
tr_cpBlockAdd( cp, i );
}
float tr_cpPercentBlocksInPiece( const tr_completion_t * cp, int piece )
{
assert( cp != NULL );
return cp->completeBlocks[piece] / (double)tr_cpCountBlocks( cp, piece );
}
int
tr_cpMissingBlocksForPiece( const tr_completion_t * cp, int piece )
{
int i;
int n;
const tr_torrent_t * tor = cp->tor;
const int start = tr_pieceStartBlock( piece );
const int end = start + tr_cpCountBlocks( cp, piece );
n = 0;
for( i = start; i < end; ++i )
if( !tr_cpBlockIsComplete( cp, i ) && !cp->blockDownloaders[i] )
++n;
return n;
}
int tr_cpMissingBlockInPiece( const tr_completion_t * cp, int piece )
{
int i;
const tr_torrent_t * tor = cp->tor;
const int start = tr_pieceStartBlock( piece );
const int end = start + tr_cpCountBlocks( cp, piece );
for( i = start; i < end; ++i )
if( !tr_cpBlockIsComplete( cp, i ) && !cp->blockDownloaders[i] )
return i;
return -1;
}
int tr_cpMostMissingBlockInPiece( const tr_completion_t * cp,
int piece,
int * downloaders )
{
tr_torrent_t * tor = cp->tor;
int start, count, end, i;
int * pool, poolSize, min, ret;
start = tr_pieceStartBlock( piece );
count = tr_cpCountBlocks( cp, piece );
end = start + count;
pool = tr_new( int, count );
poolSize = 0;
min = 255;
for( i = start; i < end; i++ )
{
if( tr_cpBlockIsComplete( cp, i ) || cp->blockDownloaders[i] > min )
{
continue;
}
if( cp->blockDownloaders[i] < min )
{
min = cp->blockDownloaders[i];
poolSize = 0;
}
if( cp->blockDownloaders[i] <= min )
{
pool[poolSize++] = i;
}
}
if( poolSize > 0 )
{
ret = pool[0];
*downloaders = min;
}
else
{
ret = -1;
}
tr_free( pool );
return ret;
}
/***
****
***/
cp_status_t
tr_cpGetStatus ( const tr_completion_t * cp )
{
int i;
int ret = TR_CP_COMPLETE;
const tr_info_t * info;
assert( cp != NULL );
assert( cp->tor != NULL );
info = &cp->tor->info;
for( i=0; i<info->pieceCount; ++i ) {
if( tr_cpPieceIsComplete( cp, i ) )
continue;
if( !info->pieces[i].dnd )
return TR_CP_INCOMPLETE;
ret = TR_CP_DONE;
}
return ret;
}
uint64_t
tr_cpLeftUntilComplete ( const tr_completion_t * cp )
{
int i;
uint64_t b=0;
const tr_torrent_t * tor;
const tr_info_t * info;
assert( cp != NULL );
assert( cp->tor != NULL );
tor = cp->tor;
info = &tor->info;
for( i=0; i<info->pieceCount; ++i )
if( !tr_cpPieceIsComplete( cp, i ) )
b += ( tr_cpCountBlocks( cp, i ) - cp->completeBlocks[ i ] );
b *= tor->blockSize;
if( tor->blockCount && !tr_cpBlockIsComplete( cp, tor->blockCount - 1 ) )
b -= (tor->blockSize - (tor->info.totalSize % tor->blockSize));
return b;
}
uint64_t
tr_cpLeftUntilDone ( const tr_completion_t * cp )
{
int i;
uint64_t b=0;
const tr_torrent_t * tor;
const tr_info_t * info;
assert( cp != NULL );
assert( cp->tor != NULL );
tor = cp->tor;
info = &tor->info;
for( i=0; i<info->pieceCount; ++i )
if( !tr_cpPieceIsComplete( cp, i ) && !info->pieces[i].dnd )
b += ( tr_cpCountBlocks( cp, i ) - cp->completeBlocks[ i ] );
b *= tor->blockSize;
if( tor->blockCount && !tr_cpBlockIsComplete( cp, tor->blockCount-1 )
&& !info->pieces[info->pieceCount-1].dnd )
b -= (tor->blockSize - (tor->info.totalSize % tor->blockSize));
return b;
}
float
tr_cpPercentComplete ( const tr_completion_t * cp )
{
const uint64_t tilComplete = tr_cpLeftUntilComplete( cp );
const uint64_t total = cp->tor->info.totalSize;
const float f = 1.0 - (double)tilComplete / total;
return MAX(0.0, f);
}
float
tr_cpPercentDone( const tr_completion_t * cp )
{
const uint64_t tilDone = tr_cpLeftUntilDone( cp );
const uint64_t total = cp->tor->info.totalSize;
const float f = 1.0 - (double)tilDone / total;
return MAX(0.0, f);
}
uint64_t
tr_cpDownloadedValid( const tr_completion_t * cp )
{
const tr_torrent_t * tor = cp->tor;
uint64_t b = tr_bitfieldCountTrueBits( cp->blockBitfield ) * tor->blockSize;
if( tor->blockCount && tr_bitfieldHas( cp->blockBitfield, tor->blockCount - 1 ) )
b -= (tor->blockSize - (tor->info.totalSize % tor->blockSize));
return b;
}
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