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//========================================================================
//
// GnomeVFSStream.cc
//
// Copyright 1996-2002 Glyph & Cog, LLC
// Copyright 2003 Martin Kretzschmar
//
//========================================================================
#ifdef __GNUC__
#pragma implementation
#endif
#include <aconf.h>
#include "config.h"
#include "GnomeVFSStream.h"
#include "gpdf-g-switch.h"
# include <libgnomevfs/gnome-vfs.h>
#include "gpdf-g-switch.h"
#ifndef NO_DECRYPTION
#include "Decrypt.h"
#endif
GnomeVFSStream::GnomeVFSStream(GnomeVFSHandle *handleA, Guint startA,
GBool limitedA, Guint lengthA, Object *dictA):
BaseStream(dictA) {
handle = handleA;
start = startA;
limited = limitedA;
length = lengthA;
bufPtr = bufEnd = buf;
bufPos = start;
savePos = 0;
saved = gFalse;
}
GnomeVFSStream::~GnomeVFSStream() {
close();
}
Stream *GnomeVFSStream::makeSubStream(Guint startA, GBool limitedA,
Guint lengthA, Object *dictA) {
return new GnomeVFSStream(handle, startA, limitedA, lengthA, dictA);
}
void GnomeVFSStream::reset() {
GnomeVFSFileSize offsetReturn;
gnome_vfs_tell(handle, &offsetReturn);
savePos = (Guint)offsetReturn;
saved = gTrue;
gnome_vfs_seek(handle, GNOME_VFS_SEEK_START, start);
bufPtr = bufEnd = buf;
bufPos = start;
#ifndef NO_DECRYPTION
if (decrypt)
decrypt->reset();
#endif
}
void GnomeVFSStream::close() {
if (saved) {
gnome_vfs_seek(handle, GNOME_VFS_SEEK_START, savePos);
saved = gFalse;
}
}
GBool GnomeVFSStream::fillBuf() {
int n;
GnomeVFSFileSize bytesRead;
#ifndef NO_DECRYPTION
char *p;
#endif
bufPos += bufEnd - buf;
bufPtr = bufEnd = buf;
if (limited && bufPos >= start + length) {
return gFalse;
}
if (limited && bufPos + gnomeVFSStreamBufSize > start + length) {
n = start + length - bufPos;
} else {
n = gnomeVFSStreamBufSize;
}
gnome_vfs_read(handle, buf, n, &bytesRead);
bufEnd = buf + bytesRead;
if (bufPtr >= bufEnd) {
return gFalse;
}
#ifndef NO_DECRYPTION
if (decrypt) {
for (p = buf; p < bufEnd; ++p) {
*p = (char)decrypt->decryptByte((Guchar)*p);
}
}
#endif
return gTrue;
}
void GnomeVFSStream::setPos(Guint pos, int dir) {
Guint size;
if (dir >= 0) {
gnome_vfs_seek(handle, GNOME_VFS_SEEK_START, pos);
bufPos = pos;
} else {
GnomeVFSFileSize offsetReturn;
gnome_vfs_seek(handle, GNOME_VFS_SEEK_END, 0);
gnome_vfs_tell(handle, &offsetReturn);
size = (Guint)offsetReturn;
if (pos > size)
pos = (Guint)size;
gnome_vfs_seek(handle, GNOME_VFS_SEEK_END, -(int)pos);
gnome_vfs_tell(handle, &offsetReturn);
bufPos = (Guint)offsetReturn;
}
bufPtr = bufEnd = buf;
}
void GnomeVFSStream::moveStart(int delta) {
start += delta;
bufPtr = bufEnd = buf;
bufPos = start;
}
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