2 * CDE - Common Desktop Environment
4 * Copyright (c) 1993-2012, The Open Group. All rights reserved.
6 * These libraries and programs are free software; you can
7 * redistribute them and/or modify them under the terms of the GNU
8 * Lesser General Public License as published by the Free Software
9 * Foundation; either version 2 of the License, or (at your option)
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15 * PURPOSE. See the GNU Lesser General Public License for more
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with these librararies and programs; if not, write
20 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
21 * Floor, Boston, MA 02110-1301 USA
23 /* $XConsortium: RewindStorageObject.C /main/1 1996/07/29 17:02:59 cde-hp $ */
24 // Copyright (c) 1994, 1995 James Clark
25 // See the file COPYING for copying permission.
28 #pragma implementation
32 #include "RewindStorageObject.h"
36 namespace SP_NAMESPACE {
39 RewindStorageObject::RewindStorageObject(Boolean mayRewind, Boolean canSeek)
40 : mayRewind_(mayRewind), canSeek_(canSeek),
41 savingBytes_(mayRewind && canSeek), readingSaved_(0)
45 Boolean RewindStorageObject::rewind(Messenger &mgr)
49 return seekToStart(mgr);
57 void RewindStorageObject::unread(const char *s, size_t n)
59 savedBytes_.append(s, n);
66 void RewindStorageObject::willNotRewind()
71 // Ensure that memory is released now.
73 tem.swap(savedBytes_);
77 Boolean RewindStorageObject::readSaved(char *buf, size_t bufSize,
82 if (nBytesRead_ >= savedBytes_.size()) {
84 // Ensure that memory is released now.
86 tem.swap(savedBytes_);
91 nread = savedBytes_.size() - nBytesRead_;
94 memcpy(buf, savedBytes_.data() + nBytesRead_, nread);