transmission/libtransmission/completion.c

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/******************************************************************************
* $Id$
*
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* Copyright (c) 2005-2008 Transmission authors and contributors
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*
* 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.
*****************************************************************************/
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#include <assert.h>
#include <string.h>
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#include "transmission.h"
#include "completion.h"
#include "torrent.h"
#include "utils.h"
struct tr_completion
{
tr_torrent * tor;
/* do we have this block? */
tr_bitfield * blockBitfield;
/* do we have this piece? */
tr_bitfield * pieceBitfield;
/* a block is complete if and only if we have it */
uint16_t * completeBlocks;
uint8_t doneDirty;
uint64_t doneHave;
uint64_t doneTotal;
uint64_t completeHave;
};
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static void
tr_cpReset( tr_completion * cp )
{
tr_torrent * tor = cp->tor;
tr_bitfieldClear( cp->pieceBitfield );
tr_bitfieldClear( cp->blockBitfield );
memset( cp->completeBlocks, 0, sizeof(uint16_t) * tor->info.pieceCount );
cp->doneDirty = TRUE;
cp->doneHave = 0;
cp->doneTotal = 0;
cp->completeHave = 0;
}
tr_completion * tr_cpInit( tr_torrent * tor )
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{
tr_completion * cp;
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cp = tr_new( tr_completion, 1 );
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cp->tor = tor;
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cp->blockBitfield = tr_bitfieldNew( tor->blockCount );
cp->pieceBitfield = tr_bitfieldNew( tor->info.pieceCount );
cp->completeBlocks = tr_new( uint16_t, tor->info.pieceCount );
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tr_cpReset( cp );
return cp;
}
void tr_cpClose( tr_completion * cp )
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{
tr_free( cp->completeBlocks );
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tr_bitfieldFree( cp->pieceBitfield );
tr_bitfieldFree( cp->blockBitfield );
tr_free( cp );
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}
/**
***
**/
static void
tr_cpEnsureDoneValid( const tr_completion * ccp )
{
if( ccp->doneDirty )
{
const tr_torrent * tor = ccp->tor;
const tr_info * info = &tor->info;
uint64_t have = 0;
uint64_t total = 0;
tr_piece_index_t i;
tr_completion * cp ;
/* too bad C doesn't have 'mutable' */
cp = (tr_completion*) ccp;
cp->doneDirty = FALSE;
for( i=0; i<info->pieceCount; ++i ) {
if( !info->pieces[i].dnd ) {
total += info->pieceSize;
have += cp->completeBlocks[ i ];
}
}
have *= tor->blockSize;
/* the last piece/block is probably smaller than the others */
if( !info->pieces[info->pieceCount-1].dnd ) {
total -= ( info->pieceSize - tr_torPieceCountBytes(tor,info->pieceCount-1) );
if( tr_cpBlockIsComplete( cp, tor->blockCount-1 ) )
have -= ( tor->blockSize - tr_torBlockCountBytes(tor,tor->blockCount-1) );
}
assert( have <= total );
assert( total <= info->totalSize );
cp->doneHave = have;
cp->doneTotal = total;
}
}
void
tr_cpInvalidateDND ( tr_completion * cp )
{
cp->doneDirty = TRUE;
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}
int
tr_cpPieceIsComplete( const tr_completion * cp,
tr_piece_index_t piece )
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{
assert( piece < cp->tor->info.pieceCount );
assert( cp->completeBlocks[piece] <= tr_torPieceCountBlocks(cp->tor,piece) );
return cp->completeBlocks[piece] == tr_torPieceCountBlocks(cp->tor,piece);
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}
const tr_bitfield * tr_cpPieceBitfield( const tr_completion * cp )
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{
return cp->pieceBitfield;
}
void
tr_cpPieceAdd( tr_completion * cp, tr_piece_index_t piece )
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{
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;
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for( i=start; i<end; ++i )
tr_cpBlockAdd( cp, i );
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}
void
tr_cpPieceRem( tr_completion * cp, tr_piece_index_t piece )
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{
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;
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assert( cp != NULL );
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 ) ) {
const int blockSize = tr_torBlockCountBytes( tor, block );
cp->completeHave -= blockSize;
if( !tor->info.pieces[piece].dnd )
cp->doneHave -= blockSize;
}
}
cp->completeBlocks[piece] = 0;
tr_bitfieldRemRange ( cp->blockBitfield, start, end );
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tr_bitfieldRem( cp->pieceBitfield, piece );
assert( cp->completeHave <= tor->info.totalSize );
assert( cp->doneHave <= tor->info.totalSize );
assert( cp->doneHave <= cp->completeHave );
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}
int
tr_cpBlockIsComplete( const tr_completion * cp, tr_block_index_t block )
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{
return tr_bitfieldHas( cp->blockBitfield, block ) ? 1 : 0;
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}
void
tr_cpBlockAdd( tr_completion * cp, tr_block_index_t block )
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{
const tr_torrent * tor = cp->tor;
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if( !tr_cpBlockIsComplete( cp, block ) )
{
const tr_piece_index_t piece = tr_torBlockPiece( tor, block );
const int blockSize = tr_torBlockCountBytes( tor, block );
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++cp->completeBlocks[piece];
if( cp->completeBlocks[piece] == tr_torPieceCountBlocks( tor, piece ) )
tr_bitfieldAdd( cp->pieceBitfield, piece );
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tr_bitfieldAdd( cp->blockBitfield, block );
cp->completeHave += blockSize;
if( !tor->info.pieces[piece].dnd )
cp->doneHave += blockSize;
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}
assert( cp->completeHave <= tor->info.totalSize );
assert( cp->doneHave <= tor->info.totalSize );
assert( cp->doneHave <= cp->completeHave );
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}
const tr_bitfield *
tr_cpBlockBitfield( const tr_completion * cp )
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{
assert( cp );
assert( cp->blockBitfield );
assert( cp->blockBitfield->bits );
assert( cp->blockBitfield->len );
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return cp->blockBitfield;
}
tr_errno
tr_cpBlockBitfieldSet( tr_completion * cp, tr_bitfield * bitfield )
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{
tr_block_index_t i;
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assert( cp );
assert( bitfield );
assert( cp->blockBitfield );
if( !cp || !bitfield || ( bitfield->len != cp->blockBitfield->len ) )
return TR_ERROR_ASSERT;
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tr_cpReset( cp );
for( i=0; i < cp->tor->blockCount; ++i )
if( tr_bitfieldHas( bitfield, i ) )
tr_cpBlockAdd( cp, i );
return 0;
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}
float
tr_cpPercentBlocksInPiece( const tr_completion * cp, tr_piece_index_t piece )
{
assert( cp != NULL );
return (double)cp->completeBlocks[piece] / tr_torPieceCountBlocks(cp->tor,piece);
}
int
tr_cpMissingBlocksInPiece( const tr_completion * cp, tr_piece_index_t piece )
{
assert( cp != NULL );
return tr_torPieceCountBlocks(cp->tor,piece) - cp->completeBlocks[piece];
}
/***
****
***/
float
tr_cpPercentComplete ( const tr_completion * cp )
{
return (double)cp->completeHave / cp->tor->info.totalSize;
}
uint64_t
tr_cpLeftUntilComplete ( const tr_completion * cp )
{
assert( cp->tor->info.totalSize >= cp->completeHave );
return cp->tor->info.totalSize - cp->completeHave;
}
float
tr_cpPercentDone( const tr_completion * cp )
{
tr_cpEnsureDoneValid( cp );
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return cp->doneTotal ? (double)cp->doneHave / cp->doneTotal : 1.0;
}
uint64_t
tr_cpLeftUntilDone ( const tr_completion * cp )
{
tr_cpEnsureDoneValid( cp );
return cp->doneTotal - cp->doneHave;
}
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uint64_t
tr_cpSizeWhenDone( const tr_completion * cp )
{
tr_cpEnsureDoneValid( cp );
return cp->doneTotal;
}
cp_status_t
tr_cpGetStatus ( const tr_completion * cp )
{
assert( cp->tor->info.totalSize >= cp->completeHave );
if( cp->completeHave == cp->tor->info.totalSize )
return TR_CP_COMPLETE;
tr_cpEnsureDoneValid( cp );
return cp->doneHave >= cp->doneTotal ? TR_CP_DONE
: TR_CP_INCOMPLETE;
}
uint64_t
tr_cpHaveValid( const tr_completion * cp )
{
uint64_t b = 0;
const tr_torrent * tor = cp->tor;
const tr_info * info = &tor->info;
tr_piece_index_t i;
for( i=0; i<info->pieceCount; ++i )
if( tr_cpPieceIsComplete( cp, i ) )
++b;
b *= info->pieceSize;
if( tr_cpPieceIsComplete( cp, info->pieceCount-1 ) )
b -= (info->pieceSize - (info->totalSize % info->pieceSize));
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return b;
}
uint64_t
tr_cpHaveTotal( const tr_completion * cp )
{
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return cp->completeHave;
}