/* returns 0 on success, or an errno on failure */
static int
readOrWritePiece( const tr_torrent * tor,
int ioMode,
tr_piece_index_t pieceIndex,
uint32_t pieceOffset,
uint8_t * buf,
size_t buflen )
{
int err = 0;
tr_file_index_t fileIndex;
uint64_t fileOffset;
const tr_info * info = &tor->info;
if( pieceIndex >= tor->info.pieceCount )
return EINVAL;
if( pieceOffset + buflen > tr_torPieceCountBytes( tor, pieceIndex ) )
return EINVAL;
tr_ioFindFileLocation( tor, pieceIndex, pieceOffset,
&fileIndex, &fileOffset );
while( buflen && !err )
{
const tr_file * file = &info->files[fileIndex];
const uint64_t bytesThisPass = MIN( buflen, file->length - fileOffset );
err = readOrWriteBytes( tor, ioMode, fileIndex, fileOffset, buf, bytesThisPass );
buf += bytesThisPass;
buflen -= bytesThisPass;
++fileIndex;
fileOffset = 0;
}
return err;
}
/* returns 0 on success, or an errno on failure */
static int
readOrWritePiece( tr_torrent * tor,
int ioMode,
tr_piece_index_t pieceIndex,
uint32_t pieceOffset,
uint8_t * buf,
size_t buflen )
{
int err = 0;
tr_file_index_t fileIndex;
uint64_t fileOffset;
const tr_info * info = &tor->info;
if( pieceIndex >= tor->info.pieceCount )
return EINVAL;
//if( pieceOffset + buflen > tr_torPieceCountBytes( tor, pieceIndex ) )
// return EINVAL;
tr_ioFindFileLocation( tor, pieceIndex, pieceOffset,
&fileIndex, &fileOffset );
while( buflen && !err )
{
const tr_file * file = &info->files[fileIndex];
const uint64_t bytesThisPass = MIN( buflen, file->length - fileOffset );
err = readOrWriteBytes( tor->session, tor, ioMode, fileIndex, fileOffset, buf, bytesThisPass );
buf += bytesThisPass;
buflen -= bytesThisPass;
//fprintf( stderr, "++fileIndex to %d\n", (int)fileIndex );
++fileIndex;
fileOffset = 0;
if( ( err != 0 ) && (ioMode == TR_IO_WRITE ) && ( tor->error != TR_STAT_LOCAL_ERROR ) )
{
char * path = tr_buildPath( tor->downloadDir, file->name, NULL );
tr_torrentSetLocalError( tor, "%s (%s)", tr_strerror( err ), path );
tr_free( path );
}
}
return err;
}
