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(trunk libT) optimize out some unnecessary cycles when there are missing files in a torrent being verified

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This commit is contained in:
Charles Kerr 2010-02-13 05:46:31 +00:00
parent 4524029ab4
commit c0cf694b85
1 changed files with 17 additions and 20 deletions
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37
libtransmission/verify.c
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@ -47,6 +47,10 @@ enum
/* #define STOPWATCH */
#ifndef HAVE_VALLOC
#define valloc malloc
#endif
static tr_bool
verifyTorrent( tr_torrent * tor, tr_bool * stopFlag )
{
@ -59,9 +63,10 @@ verifyTorrent( tr_torrent * tor, tr_bool * stopFlag )
uint32_t piecePos = 0;
uint32_t pieceBytesRead = 0;
tr_file_index_t fileIndex = 0;
tr_file_index_t prevFileIndex = !fileIndex;
tr_piece_index_t pieceIndex = 0;
uint8_t * buffer = NULL;
int64_t buflen = 0;
const int64_t buflen = 4096;
uint8_t * buffer = valloc( buflen );
const time_t begin = tr_time( );
time_t end;
@ -72,7 +77,6 @@ verifyTorrent( tr_torrent * tor, tr_bool * stopFlag )
int64_t leftInPiece;
int64_t leftInFile;
int64_t bytesThisPass;
ssize_t numRead;
const tr_file * file = &tor->info.files[fileIndex];
/* if we're starting a new piece... */
@ -83,22 +87,13 @@ verifyTorrent( tr_torrent * tor, tr_bool * stopFlag )
}
/* if we're starting a new file... */
if( !filePos && (fd<0) )
if( !filePos && (fd<0) && (fileIndex!=prevFileIndex) )
{
char * filename = tr_torrentFindFile( tor, fileIndex );
fd = filename == NULL ? -1 : tr_open_file_for_scanning( filename );
/* fprintf( stderr, "opening file #%d (%s) -- %d\n", fileIndex, filename, fd ); */
if( ( fd >= 0 ) && ( buffer == NULL ) )
{
struct stat st;
buflen = fstat( fd, &st ) ? 4096 : st.st_blksize;
#ifdef HAVE_VALLOC
buffer = valloc( buflen );
#else
buffer = malloc( buflen );
#endif
}
tr_free( filename );
prevFileIndex = fileIndex;
}
/* figure out how much we can read this pass */
@ -109,14 +104,16 @@ verifyTorrent( tr_torrent * tor, tr_bool * stopFlag )
/* fprintf( stderr, "reading this pass: %d\n", (int)bytesThisPass ); */
/* read a bit */
numRead = tr_pread( fd, buffer, bytesThisPass, filePos );
if( numRead == bytesThisPass )
SHA1_Update( &sha, buffer, numRead );
if( numRead > 0 ) {
pieceBytesRead += numRead;
if( fd >= 0 ) {
const ssize_t numRead = tr_pread( fd, buffer, bytesThisPass, filePos );
if( numRead == bytesThisPass )
SHA1_Update( &sha, buffer, numRead );
if( numRead > 0 ) {
pieceBytesRead += numRead;
#if defined HAVE_POSIX_FADVISE && defined POSIX_FADV_DONTNEED
posix_fadvise( fd, filePos, bytesThisPass, POSIX_FADV_DONTNEED );
posix_fadvise( fd, filePos, bytesThisPass, POSIX_FADV_DONTNEED );
#endif
}
}
/* move our offsets */