size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
{
+ if ( m_lasterror != wxSTREAM_NO_ERROR && m_lasterror != wxSTREAM_EOF )
+ {
+ // can't operate on this stream until the error is cleared
+ return 0;
+ }
+
char *ptrback = AllocSpaceWBack(bufsize);
if (!ptrback)
return 0;
+ // Eof() shouldn't return TRUE any longer
+ if ( m_lasterror == wxSTREAM_EOF )
+ m_lasterror = wxSTREAM_NO_ERROR;
+
memcpy(ptrback, buf, bufsize);
return bufsize;
}
bool wxInputStream::Ungetch(char c)
{
- void *ptrback = AllocSpaceWBack(1);
- if (!ptrback)
- return FALSE;
-
- *(char *)ptrback = c;
- return TRUE;
+ return Ungetch(&c, sizeof(char)) != 0;
}
char wxInputStream::GetC()
wxInputStream& wxInputStream::Read(void *buf, size_t size)
{
- size_t retsize = GetWBack(buf, size);
- if (retsize == size)
+ char *p = (char *)buf;
+ m_lastcount = 0;
+
+ size_t read = GetWBack(buf, size);
+ for ( ;; )
{
- m_lastcount = size;
- m_lasterror = wxStream_NOERROR;
- return *this;
+ size -= read;
+ m_lastcount += read;
+ p += read;
+
+ if ( !size )
+ {
+ // we read the requested amount of data
+ break;
+ }
+
+ read = OnSysRead(buf, size);
+ if ( !read )
+ {
+ // no more data available
+ break;
+ }
}
- size -= retsize;
- buf = (char *)buf + retsize;
- m_lastcount = OnSysRead(buf, size) + retsize;
return *this;
}