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https://github.com/transmission/transmission
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(trunk libT) make readOrWriteBytes() more readable
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parent
a69effcf4b
commit
29af00ef56
1 changed files with 38 additions and 35 deletions
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@ -46,12 +46,11 @@ readOrWriteBytes( tr_session * session,
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void * buf,
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size_t buflen )
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{
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const tr_info * info = &tor->info;
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const tr_file * file = &info->files[fileIndex];
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int fd = -1;
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int err = 0;
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int fd;
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int err = 0;
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const tr_bool doWrite = ioMode >= TR_IO_WRITE;
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const tr_info * const info = &tor->info;
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const tr_file * const file = &info->files[fileIndex];
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assert( fileIndex < info->fileCount );
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assert( !file->length || ( fileOffset < file->length ) );
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@ -60,59 +59,63 @@ readOrWriteBytes( tr_session * session,
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if( !file->length )
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return 0;
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fd = tr_fdFileGetCached( session, tr_torrentId( tor ), fileIndex, doWrite );
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/***
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**** Find the fd
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***/
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fd = tr_fdFileGetCached( session, tr_torrentId( tor ), fileIndex, doWrite );
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if( fd < 0 )
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{
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/* the fd cache doesn't have this file...
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* we'll need to open it and maybe create it */
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/* it's not cached, so open/create it now */
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char * subpath;
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const char * base;
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tr_bool fileExists;
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tr_preallocation_mode preallocationMode;
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fileExists = tr_torrentFindFile2( tor, fileIndex, &base, &subpath );
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if( !fileExists )
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/* see if the file exists... */
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if( !tr_torrentFindFile2( tor, fileIndex, &base, &subpath ) )
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{
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/* we can't read a file that doesn't exist... */
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if( !doWrite )
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err = ENOENT;
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/* figure out where the file should go, so we can create it */
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base = tr_torrentGetCurrentDir( tor );
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subpath = tr_sessionIsIncompleteFileNamingEnabled( tor->session )
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? tr_torrentBuildPartial( tor, fileIndex )
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: tr_strdup( file->name );
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if( tr_sessionIsIncompleteFileNamingEnabled( tor->session ) )
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subpath = tr_torrentBuildPartial( tor, fileIndex );
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else
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subpath = tr_strdup( file->name );
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}
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if( ( file->dnd ) || ( ioMode < TR_IO_WRITE ) )
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preallocationMode = TR_PREALLOCATE_NONE;
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else
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preallocationMode = tor->session->preallocationMode;
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if( ( ioMode < TR_IO_WRITE ) && !fileExists ) /* does file exist? */
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{
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err = ENOENT;
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}
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else
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if( !err )
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{
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/* open (and maybe create) the file */
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char * filename = tr_buildPath( base, subpath, NULL );
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if( ( fd = tr_fdFileCheckout( session, tor->uniqueId, fileIndex,
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base, filename,
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doWrite, preallocationMode, file->length ) ) < 0 )
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const int prealloc = file->dnd || !doWrite
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? TR_PREALLOCATE_NONE
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: tor->session->preallocationMode;
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if((( fd = tr_fdFileCheckout( session, tor->uniqueId, fileIndex,
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base, filename, doWrite,
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prealloc, file->length ))) < 0 )
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{
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err = errno;
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tr_torerr( tor, "tr_fdFileCheckout failed for \"%s\": %s", filename, tr_strerror( err ) );
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tr_torerr( tor, "tr_fdFileCheckout failed for \"%s\": %s",
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filename, tr_strerror( err ) );
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}
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else if( doWrite )
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{
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/* make a note that we just created a file */
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tr_statsFileCreated( tor->session );
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}
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tr_free( filename );
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}
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if( doWrite && !err )
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tr_statsFileCreated( tor->session );
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tr_free( subpath );
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}
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/***
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**** Use the fd
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***/
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if( !err )
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{
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if( ioMode == TR_IO_READ ) {
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