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// Copyright (c) 1994, 1995 James Clark
// See the file COPYING for copying permission.
#ifdef __GNUG__
#pragma implementation
#endif
#include "splib.h"
#include "RewindStorageObject.h"
#include "macros.h"
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
RewindStorageObject::RewindStorageObject(Boolean mayRewind, Boolean canSeek)
: mayRewind_(mayRewind), canSeek_(canSeek),
savingBytes_(mayRewind && !canSeek), readingSaved_(0)
{
}
Boolean RewindStorageObject::rewind(Messenger &mgr)
{
ASSERT(mayRewind_);
if (canSeek_)
return seekToStart(mgr);
else {
readingSaved_ = 1;
nBytesRead_ = 0;
return 1;
}
}
void RewindStorageObject::unread(const char *s, size_t n)
{
savedBytes_.append(s, n);
if (!readingSaved_) {
readingSaved_ = 1;
nBytesRead_ = 0;
}
}
void RewindStorageObject::willNotRewind()
{
mayRewind_ = 0;
savingBytes_ = 0;
if (!readingSaved_) {
// Ensure that memory is released now.
String<char> tem;
tem.swap(savedBytes_);
}
}
Boolean RewindStorageObject::readSaved(char *buf, size_t bufSize,
size_t &nread)
{
if (!readingSaved_)
return 0;
if (nBytesRead_ >= savedBytes_.size()) {
if (!mayRewind_) {
// Ensure that memory is released now.
String<char> tem;
tem.swap(savedBytes_);
}
readingSaved_ = 0;
return 0;
}
nread = savedBytes_.size() - nBytesRead_;
if (nread > bufSize)
nread = bufSize;
memcpy(buf, savedBytes_.data() + nBytesRead_, nread);
nBytesRead_ += nread;
return 1;
}
#ifdef SP_NAMESPACE
}
#endif
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