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transmission/libtransmission/completion.c

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/*
* This file Copyright (C) 2009 Charles Kerr <charles@transmissionbt.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#include <assert.h>
#include <string.h>
#include "transmission.h"
#include "completion.h"
#include "torrent.h"
#include "utils.h"
static void
tr_cpReset( tr_completion * cp )
{
tr_bitfieldClear( &cp->pieceBitfield );
tr_bitfieldClear( &cp->blockBitfield );
memset( cp->completeBlocks, 0, sizeof( uint16_t ) * cp->tor->info.pieceCount );
cp->sizeNow = 0;
cp->sizeWhenDoneIsDirty = 1;
cp->haveValidIsDirty = 1;
}
tr_completion *
tr_cpConstruct( tr_completion * cp, tr_torrent * tor )
{
cp->tor = tor;
cp->completeBlocks = tr_new( uint16_t, tor->info.pieceCount );
tr_bitfieldConstruct( &cp->blockBitfield, tor->blockCount );
tr_bitfieldConstruct( &cp->pieceBitfield, tor->info.pieceCount );
tr_cpReset( cp );
return cp;
}
tr_completion*
tr_cpDestruct( tr_completion * cp )
{
tr_free( cp->completeBlocks );
tr_bitfieldDestruct( &cp->pieceBitfield );
tr_bitfieldDestruct( &cp->blockBitfield );
return cp;
}
void
tr_cpInvalidateDND( tr_completion * cp )
{
cp->sizeWhenDoneIsDirty = 1;
}
uint64_t
tr_cpSizeWhenDone( const tr_completion * ccp )
{
if( ccp->sizeWhenDoneIsDirty )
{
tr_completion * cp = (tr_completion *) ccp; /* mutable */
const tr_torrent * tor = cp->tor;
const tr_info * info = &tor->info;
tr_piece_index_t i;
uint64_t size = 0;
for( i = 0; i < info->pieceCount; ++i )
{
if( !info->pieces[i].dnd )
{
/* we want the piece... */
size += tr_torPieceCountBytes( tor, i );
}
else if( tr_cpPieceIsComplete( cp, i ) )
{
/* we have the piece... */
size += tr_torPieceCountBytes( tor, i );
}
else if( cp->completeBlocks[i] )
{
/* we have part of the piece... */
const tr_block_index_t b = tr_torPieceFirstBlock( tor, i );
const tr_block_index_t e = b + tr_torPieceCountBlocks( tor,
i );
tr_block_index_t j;
for( j = b; j < e; ++j )
if( tr_cpBlockIsComplete( cp, j ) )
size += tr_torBlockCountBytes( tor, j );
}
}
cp->sizeWhenDoneLazy = size;
cp->sizeWhenDoneIsDirty = 0;
}
assert( ccp->sizeWhenDoneLazy <= ccp->tor->info.totalSize );
assert( ccp->sizeWhenDoneLazy >= ccp->sizeNow );
return ccp->sizeWhenDoneLazy;
}
void
tr_cpPieceAdd( tr_completion * cp,
tr_piece_index_t piece )
{
const tr_torrent * tor = cp->tor;
const tr_block_index_t start = tr_torPieceFirstBlock( tor, piece );
const tr_block_index_t end = start + tr_torPieceCountBlocks( tor, piece );
tr_block_index_t i;
for( i = start; i < end; ++i )
tr_cpBlockAdd( cp, i );
}
void
tr_cpPieceRem( tr_completion * cp,
tr_piece_index_t piece )
{
const tr_torrent * tor = cp->tor;
const tr_block_index_t start = tr_torPieceFirstBlock( tor, piece );
const tr_block_index_t end = start + tr_torPieceCountBlocks( tor, piece );
tr_block_index_t block;
assert( cp );
assert( piece < tor->info.pieceCount );
assert( start < tor->blockCount );
assert( start <= end );
assert( end <= tor->blockCount );
for( block = start; block < end; ++block )
if( tr_cpBlockIsComplete( cp, block ) )
cp->sizeNow -= tr_torBlockCountBytes( tor, block );
cp->sizeWhenDoneIsDirty = 1;
cp->haveValidIsDirty = 1;
cp->completeBlocks[piece] = 0;
tr_bitfieldRemRange ( &cp->blockBitfield, start, end );
tr_bitfieldRem( &cp->pieceBitfield, piece );
}
void
tr_cpBlockAdd( tr_completion * cp, tr_block_index_t block )
{
const tr_torrent * tor = cp->tor;
if( !tr_cpBlockIsComplete( cp, block ) )
{
const tr_piece_index_t piece = tr_torBlockPiece( tor, block );
const int blockSize = tr_torBlockCountBytes( tor,
block );
++cp->completeBlocks[piece];
if( tr_cpPieceIsComplete( cp, piece ) )
tr_bitfieldAdd( &cp->pieceBitfield, piece );
tr_bitfieldAdd( &cp->blockBitfield, block );
cp->sizeNow += blockSize;
cp->haveValidIsDirty = 1;
cp->sizeWhenDoneIsDirty = 1;
}
}
/* Initialize a completion object from a bitfield indicating which blocks we have */
tr_bool
tr_cpBlockBitfieldSet( tr_completion * cp, tr_bitfield * blockBitfield )
{
int success = FALSE;
assert( cp );
assert( blockBitfield );
/* The bitfield of block flags is typically loaded from a resume file.
Test the bitfield's length in case the resume file somehow got corrupted */
if(( success = blockBitfield->byteCount == cp->blockBitfield.byteCount ))
{
tr_block_index_t b = 0;
tr_piece_index_t p = 0;
uint32_t pieceBlock = 0;
uint32_t completeBlocksInPiece = 0;
tr_block_index_t completeBlocksInTorrent = 0;
uint32_t blocksInCurrentPiece = tr_torPieceCountBlocks( cp->tor, p );
/* start cp with a state where it thinks we have nothing */
tr_cpReset( cp );
/* init our block bitfield from the one passed in */
memcpy( cp->blockBitfield.bits, blockBitfield->bits, blockBitfield->byteCount );
/* invalidate the fields that are lazy-evaluated */
cp->sizeWhenDoneIsDirty = TRUE;
cp->haveValidIsDirty = TRUE;
/* to set the remaining fields, we walk through every block... */
while( b < cp->tor->blockCount )
{
if( tr_bitfieldHasFast( blockBitfield, b ) )
++completeBlocksInPiece;
++b;
++pieceBlock;
/* by the time we reach the end of a piece, we have enough info
to update that piece's slot in cp.completeBlocks and cp.pieceBitfield */
if( pieceBlock == blocksInCurrentPiece )
{
cp->completeBlocks[p] = completeBlocksInPiece;
completeBlocksInTorrent += completeBlocksInPiece;
if( completeBlocksInPiece == blocksInCurrentPiece )
tr_bitfieldAdd( &cp->pieceBitfield, p );
/* reset the per-piece counters because we're starting on a new piece now */
++p;
completeBlocksInPiece = 0;
pieceBlock = 0;
blocksInCurrentPiece = tr_torPieceCountBlocks( cp->tor, p );
}
}
/* update sizeNow */
cp->sizeNow = completeBlocksInTorrent;
cp->sizeNow *= tr_torBlockCountBytes( cp->tor, 0 );
if( tr_bitfieldHasFast( &cp->blockBitfield, cp->tor->blockCount-1 ) ) {
/* the last block is usually smaller than the other blocks,
so handle that special case or cp->sizeNow might be too large */
cp->sizeNow -= tr_torBlockCountBytes( cp->tor, 0 );
cp->sizeNow += tr_torBlockCountBytes( cp->tor, cp->tor->blockCount-1 );
}
}
return success;
}
/***
****
***/
tr_completeness
tr_cpGetStatus( const tr_completion * cp )
{
if( cp->sizeNow == cp->tor->info.totalSize ) return TR_SEED;
if( cp->sizeNow == tr_cpSizeWhenDone( cp ) ) return TR_PARTIAL_SEED;
return TR_LEECH;
}
static uint64_t
calculateHaveValid( const tr_completion * ccp )
{
uint64_t b = 0;
tr_piece_index_t i;
const tr_torrent * tor = ccp->tor;
const uint64_t pieceSize = tor->info.pieceSize;
const uint64_t lastPieceSize = tor->lastPieceSize;
const tr_piece_index_t lastPiece = tor->info.pieceCount - 1;
for( i=0; i!=lastPiece; ++i )
if( tr_cpPieceIsComplete( ccp, i ) )
b += pieceSize;
if( tr_cpPieceIsComplete( ccp, lastPiece ) )
b += lastPieceSize;
return b;
}
uint64_t
tr_cpHaveValid( const tr_completion * ccp )
{
if( ccp->haveValidIsDirty )
{
tr_completion * cp = (tr_completion *) ccp; /* mutable */
cp->haveValidLazy = calculateHaveValid( ccp );
cp->haveValidIsDirty = 0;
}
return ccp->haveValidLazy;
}
void
tr_cpGetAmountDone( const tr_completion * cp,
float * tab,
int tabCount )
{
int i;
const tr_torrent * tor = cp->tor;
const float interval = tor->info.pieceCount / (float)tabCount;
const int isSeed = tr_cpGetStatus( cp ) == TR_SEED;
for( i = 0; i < tabCount; ++i )
{
const tr_piece_index_t piece = i * interval;
if( tor == NULL )
tab[i] = 0.0f;
else if( isSeed || tr_cpPieceIsComplete( cp, piece ) )
tab[i] = 1.0f;
else
tab[i] = (float)cp->completeBlocks[piece] /
tr_torPieceCountBlocks( tor, piece );
}
}
int
tr_cpMissingBlocksInPiece( const tr_completion * cp, tr_piece_index_t piece )
{
return tr_torPieceCountBlocks( cp->tor, piece ) - cp->completeBlocks[piece];
}
tr_bool
tr_cpPieceIsComplete( const tr_completion * cp, tr_piece_index_t piece )
{
return cp->completeBlocks[piece] == tr_torPieceCountBlocks( cp->tor, piece );
}
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