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Don't throw away buffer if a seek is totally within existing cache.

This commit is contained in:
Ryan C. Gordon 2004-08-23 03:34:03 +00:00
parent bf41b44099
commit f3af262a99
1 changed files with 16 additions and 1 deletions
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17
physfs.c
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@ -1875,7 +1875,22 @@ int PHYSFS_seek(PHYSFS_file *handle, PHYSFS_uint64 pos)
{ {
FileHandle *h = (FileHandle *) handle->opaque; FileHandle *h = (FileHandle *) handle->opaque;
BAIL_IF_MACRO(!PHYSFS_flush(handle), NULL, 0); BAIL_IF_MACRO(!PHYSFS_flush(handle), NULL, 0);
h->buffill = h->bufpos = 0; /* just in case. */
if (h->buffer && h->forReading)
{
/* avoid throwing away our precious buffer if seeking within it. */
PHYSFS_sint64 offset = pos - PHYSFS_tell(handle);
if ( /* seeking within the already-buffered range? */
((offset >= 0) && (offset <= h->buffill - h->bufpos)) /* forwards */
|| ((offset < 0) && (-offset <= h->bufpos)) /* backwards */ )
{
h->bufpos += offset;
return(1); /* successful seek */
} /* if */
} /* if */
/* we have to fall back to a 'raw' seek. */
h->buffill = h->bufpos = 0;
return(h->funcs->seek(h, pos)); return(h->funcs->seek(h, pos));
} /* PHYSFS_seek */ } /* PHYSFS_seek */