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(trunk libT) make readOrWriteBytes() more readable

This commit is contained in:
Jordan Lee 2011-03-16 04:44:38 +00:00
parent a69effcf4b
commit 29af00ef56
1 changed files with 38 additions and 35 deletions
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73
libtransmission/inout.c
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@ -46,12 +46,11 @@ readOrWriteBytes( tr_session * session,
void * buf,
size_t buflen )
{
const tr_info * info = &tor->info;
const tr_file * file = &info->files[fileIndex];
int fd = -1;
int err = 0;
int fd;
int err = 0;
const tr_bool doWrite = ioMode >= TR_IO_WRITE;
const tr_info * const info = &tor->info;
const tr_file * const file = &info->files[fileIndex];
assert( fileIndex < info->fileCount );
assert( !file->length || ( fileOffset < file->length ) );
@ -60,59 +59,63 @@ readOrWriteBytes( tr_session * session,
if( !file->length )
return 0;
fd = tr_fdFileGetCached( session, tr_torrentId( tor ), fileIndex, doWrite );
/***
**** Find the fd
***/
fd = tr_fdFileGetCached( session, tr_torrentId( tor ), fileIndex, doWrite );
if( fd < 0 )
{
/* the fd cache doesn't have this file...
* we'll need to open it and maybe create it */
/* it's not cached, so open/create it now */
char * subpath;
const char * base;
tr_bool fileExists;
tr_preallocation_mode preallocationMode;
fileExists = tr_torrentFindFile2( tor, fileIndex, &base, &subpath );
if( !fileExists )
/* see if the file exists... */
if( !tr_torrentFindFile2( tor, fileIndex, &base, &subpath ) )
{
/* we can't read a file that doesn't exist... */
if( !doWrite )
err = ENOENT;
/* figure out where the file should go, so we can create it */
base = tr_torrentGetCurrentDir( tor );
subpath = tr_sessionIsIncompleteFileNamingEnabled( tor->session )
? tr_torrentBuildPartial( tor, fileIndex )
: tr_strdup( file->name );
if( tr_sessionIsIncompleteFileNamingEnabled( tor->session ) )
subpath = tr_torrentBuildPartial( tor, fileIndex );
else
subpath = tr_strdup( file->name );
}
if( ( file->dnd ) || ( ioMode < TR_IO_WRITE ) )
preallocationMode = TR_PREALLOCATE_NONE;
else
preallocationMode = tor->session->preallocationMode;
if( ( ioMode < TR_IO_WRITE ) && !fileExists ) /* does file exist? */
{
err = ENOENT;
}
else
if( !err )
{
/* open (and maybe create) the file */
char * filename = tr_buildPath( base, subpath, NULL );
if( ( fd = tr_fdFileCheckout( session, tor->uniqueId, fileIndex,
base, filename,
doWrite, preallocationMode, file->length ) ) < 0 )
const int prealloc = file->dnd || !doWrite
? TR_PREALLOCATE_NONE
: tor->session->preallocationMode;
if((( fd = tr_fdFileCheckout( session, tor->uniqueId, fileIndex,
base, filename, doWrite,
prealloc, file->length ))) < 0 )
{
err = errno;
tr_torerr( tor, "tr_fdFileCheckout failed for \"%s\": %s", filename, tr_strerror( err ) );
tr_torerr( tor, "tr_fdFileCheckout failed for \"%s\": %s",
filename, tr_strerror( err ) );
}
else if( doWrite )
{
/* make a note that we just created a file */
tr_statsFileCreated( tor->session );
}
tr_free( filename );
}
if( doWrite && !err )
tr_statsFileCreated( tor->session );
tr_free( subpath );
}
/***
**** Use the fd
***/
if( !err )
{
if( ioMode == TR_IO_READ ) {