313 lines
8.3 KiB
C
313 lines
8.3 KiB
C
/*
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* This file Copyright (C) 2007 Charles Kerr <charles@rebelbase.com>
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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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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "transmission.h"
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#include "fdlimit.h"
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struct tr_io_s
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{
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tr_torrent_t * tor;
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};
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/****
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***** Low-level IO functions
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****/
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enum { TR_IO_READ, TR_IO_WRITE };
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static int
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readOrWriteBytes ( const tr_torrent_t * tor,
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int ioMode,
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int fileIndex,
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uint64_t fileOffset,
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void * buf,
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size_t buflen )
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{
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const tr_info_t * info = &tor->info;
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const tr_file_t * file = &info->files[fileIndex];
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typedef size_t (* iofunc) ( int, void *, size_t );
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iofunc func = ioMode == TR_IO_READ ? (iofunc)read : (iofunc)write;
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char path[MAX_PATH_LENGTH];
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struct stat sb;
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int fd = -1;
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int ret;
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assert ( 0<=fileIndex && fileIndex<info->fileCount );
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assert ( !file->length || (fileOffset < file->length));
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assert ( fileOffset + buflen <= file->length );
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tr_buildPath ( path, sizeof(path), tor->destination, file->name, NULL );
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if( !file->length )
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return 0;
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else if ((ioMode==TR_IO_READ) && stat( path, &sb ) ) /* fast check to make sure file exists */
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ret = tr_ioErrorFromErrno ();
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else if ((fd = tr_fdFileOpen ( tor->destination, file->name, ioMode==TR_IO_WRITE )) < 0)
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ret = fd;
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else if( lseek( fd, (off_t)fileOffset, SEEK_SET ) == ((off_t)-1) )
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ret = TR_ERROR_IO_OTHER;
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else if( func( fd, buf, buflen ) != buflen )
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ret = tr_ioErrorFromErrno ();
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else
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ret = TR_OK;
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if( fd >= 0 )
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tr_fdFileRelease( fd );
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return ret;
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}
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static void
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findFileLocation ( const tr_torrent_t * tor,
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int pieceIndex,
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int pieceOffset,
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int * fileIndex,
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uint64_t * fileOffset )
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{
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const tr_info_t * info = &tor->info;
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int i;
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uint64_t piecePos = ((uint64_t)pieceIndex * info->pieceSize) + pieceOffset;
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assert ( 0<=pieceIndex && pieceIndex < info->pieceCount );
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assert ( 0<=tor->info.pieceSize );
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assert ( pieceOffset < tr_torPieceCountBytes( tor, pieceIndex ) );
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assert ( piecePos < info->totalSize );
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for ( i=0; info->files[i].length<=piecePos; ++i )
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piecePos -= info->files[i].length;
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*fileIndex = i;
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*fileOffset = piecePos;
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assert ( 0<=*fileIndex && *fileIndex<info->fileCount );
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assert ( *fileOffset < info->files[i].length );
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}
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static int
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ensureMinimumFileSize ( const tr_torrent_t * tor,
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int fileIndex,
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uint64_t minSize ) /* in bytes */
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{
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int fd;
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int ret;
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struct stat sb;
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const tr_file_t * file = &tor->info.files[fileIndex];
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assert ( 0<=fileIndex && fileIndex<tor->info.fileCount );
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assert ( minSize <= file->length );
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fd = tr_fdFileOpen( tor->destination, file->name, TRUE );
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if( fd < 0 ) /* bad fd */
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ret = fd;
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else if (fstat (fd, &sb) ) /* how big is the file? */
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ret = tr_ioErrorFromErrno ();
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else if ((size_t)sb.st_size >= minSize) /* already big enough */
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ret = TR_OK;
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else if (!ftruncate( fd, minSize )) /* grow it */
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ret = TR_OK;
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else /* couldn't grow it */
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ret = tr_ioErrorFromErrno ();
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if( fd >= 0 )
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tr_fdFileRelease( fd );
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return ret;
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}
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static int
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readOrWritePiece ( tr_torrent_t * tor,
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int ioMode,
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int pieceIndex,
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int pieceOffset,
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uint8_t * buf,
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size_t buflen )
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{
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int ret = 0;
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int fileIndex;
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uint64_t fileOffset;
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const tr_info_t * info = &tor->info;
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assert( 0<=pieceIndex && pieceIndex<tor->info.pieceCount );
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assert( buflen <= (size_t) tr_torPieceCountBytes( tor, pieceIndex ) );
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findFileLocation ( tor, pieceIndex, pieceOffset, &fileIndex, &fileOffset );
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while( buflen && !ret )
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{
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const tr_file_t * file = &info->files[fileIndex];
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const uint64_t bytesThisPass = MIN( buflen, file->length - fileOffset );
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if( ioMode == TR_IO_WRITE )
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ret = ensureMinimumFileSize( tor, fileIndex,
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fileOffset + bytesThisPass );
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if( !ret )
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ret = readOrWriteBytes( tor, ioMode,
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fileIndex, fileOffset, buf, bytesThisPass );
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buf += bytesThisPass;
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buflen -= bytesThisPass;
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fileIndex++;
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fileOffset = 0;
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}
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return ret;
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}
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int
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tr_ioRead( tr_io_t * io, int pieceIndex, int begin, int len, uint8_t * buf )
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{
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return readOrWritePiece ( io->tor, TR_IO_READ, pieceIndex, begin, buf, len );
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}
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int
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tr_ioWrite( tr_io_t * io, int pieceIndex, int begin, int len, uint8_t * buf )
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{
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return readOrWritePiece ( io->tor, TR_IO_WRITE, pieceIndex, begin, buf, len );
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}
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/****
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*****
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****/
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static int
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tr_ioRecalculateHash ( tr_torrent_t * tor,
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int pieceIndex,
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uint8_t * setme )
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{
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int n;
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int ret;
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uint8_t * buf;
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const tr_info_t * info;
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assert( tor != NULL );
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assert( setme != NULL );
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assert( 0<=pieceIndex && pieceIndex<tor->info.pieceCount );
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info = &tor->info;
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n = tr_torPieceCountBytes( tor, pieceIndex );
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buf = malloc( n );
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ret = readOrWritePiece ( tor, TR_IO_READ, pieceIndex, 0, buf, n );
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if( !ret ) {
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SHA1( buf, n, setme );
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}
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free( buf );
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return ret;
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}
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static int
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checkPiece ( tr_torrent_t * tor, int pieceIndex )
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{
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uint8_t hash[SHA_DIGEST_LENGTH];
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int ret = tr_ioRecalculateHash( tor, pieceIndex, hash )
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|| memcmp( hash, tor->info.pieces[pieceIndex].hash, SHA_DIGEST_LENGTH );
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tr_dbg ("torrent [%s] piece %d hash check: %s",
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tor->info.name, pieceIndex, (ret?"FAILED":"OK"));
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return ret;
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}
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void
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tr_ioCheckFiles( tr_torrent_t * tor )
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{
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assert( tor != NULL );
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assert( tor->completion != NULL );
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assert( tor->info.pieceCount > 0 );
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if( tor->uncheckedPieces != NULL )
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{
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int i;
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/* remove the unchecked pieces from completion... */
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for( i=0; i<tor->info.pieceCount; ++i )
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if( tr_bitfieldHas( tor->uncheckedPieces, i ) )
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tr_cpPieceRem( tor->completion, i );
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tr_inf( "Verifying some pieces of \"%s\"", tor->info.name );
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for( i=0; i<tor->info.pieceCount; ++i )
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{
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if( !tr_bitfieldHas( tor->uncheckedPieces, i ) )
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continue;
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tr_torrentSetHasPiece( tor, i, !checkPiece( tor, i ) );
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tr_bitfieldRem( tor->uncheckedPieces, i );
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}
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tr_bitfieldFree( tor->uncheckedPieces );
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tor->uncheckedPieces = NULL;
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tor->fastResumeDirty = TRUE;
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}
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}
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/****
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***** Life Cycle
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****/
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tr_io_t*
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tr_ioNew ( tr_torrent_t * tor )
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{
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tr_io_t * io = tr_calloc( 1, sizeof( tr_io_t ) );
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io->tor = tor;
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return io;
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}
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void
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tr_ioSync( tr_io_t * io )
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{
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if( io != NULL )
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{
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int i;
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const tr_info_t * info = &io->tor->info;
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for( i=0; i<info->fileCount; ++i )
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tr_fdFileClose( io->tor->destination, info->files[i].name );
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}
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}
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void
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tr_ioClose( tr_io_t * io )
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{
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if( io != NULL )
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{
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tr_ioSync( io );
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tr_free( io );
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}
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}
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int
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tr_ioHash( tr_io_t * io, int pieceIndex )
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{
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int i;
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tr_torrent_t * tor = io->tor;
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const int success = !checkPiece( tor, pieceIndex );
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if( success )
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{
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tr_inf( "Piece %d hash OK", pieceIndex );
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tr_cpPieceAdd( tor->completion, pieceIndex );
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}
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else
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{
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tr_err( "Piece %d hash FAILED", pieceIndex );
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tr_cpPieceRem( tor->completion, pieceIndex );
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}
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/* Assign blame or credit to peers */
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for( i = 0; i < tor->peerCount; ++i )
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tr_peerBlame( tor->peers[i], pieceIndex, success );
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return 0;
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}
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