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authorTobias Klauser <tklauser@distanz.ch>2008-10-08 19:22:25 +0200
committerTobias Klauser <tklauser@xenon.tklauser.home>2008-10-08 19:22:25 +0200
commit2a441ecbea378da1a2cdea969c48bb7d9e547135 (patch)
tree63e071a86374ad86615c67f4c75534c4df8b6ab3 /cursor.cpp
parent226f961c4b7fef115ae2c7950abe0e1973efc6a4 (diff)
Import new upstream release 0.42
Diffstat (limited to 'cursor.cpp')
-rwxr-xr-xcursor.cpp158
1 files changed, 0 insertions, 158 deletions
diff --git a/cursor.cpp b/cursor.cpp
deleted file mode 100755
index cef8c7a..0000000
--- a/cursor.cpp
+++ /dev/null
@@ -1,158 +0,0 @@
-/* $Id: cursor.cpp,v 1.3 2006/11/05 04:42:43 ganzhorn Exp $
- * This file is part of lfhex.
- * Copyright (C) 2006 Salem Ganzhorn <eyekode@yahoo.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation version 2.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
-
-#include "local.h"
-#include "cursor.hpp"
-
-//
-// Cursor implimentation
-//
-
-Cursor::Cursor(off_t byteOffset,
- off_t charOffset,
- off_t low,
- off_t high,
- off_t charsPerByte)
-: _byteOffset(byteOffset),
- _charOffset(charOffset),
- _low(low),
- _high(high),
- _charsPerByte(charsPerByte)
-{}
-// note: range includes low but excludes high: [low,high) (like stl)
-// note: [foo,foo) is considered the empty set
-bool Cursor::setRange( off_t low, off_t high )
-{
- if ( low > high )
- return false;
- _low = low;
- _high = high;
- return true;
-}
-
-off_t Cursor::decrByByte( off_t n )
-{
- // check for underflow
- if (n > _byteOffset)
- return OutOfRange;
- else
- _byteOffset -= n;
- return _byteOffset;
-}
-off_t Cursor::decrByChar( off_t n )
-{
- off_t byteDelta = n/_charsPerByte;
- off_t charDelta = n%_charsPerByte;
-
- if ( charDelta > _charOffset ) {
- if( byteDelta == MAX_OFFSET ) {
- throw out_of_range("Cursor decriment underflowed.\n");
- }
- byteDelta++;
- }
- // if underflow.. then just return
- if( byteDelta && OutOfRange == decrByByte( byteDelta ) ) {
- return _charOffset;
- }
- if ( charDelta > _charOffset ) {
- // offset == maxidx - abs(_charOffset - charDelta)
- _charOffset = (_charsPerByte) - (charDelta - _charOffset);
- } else {
- _charOffset -= charDelta;
- }
- return _charOffset;
-}
-// note: off_t is always positive
-off_t Cursor::incrByChar( off_t n )
-{
- off_t byteDelta = n/_charsPerByte;
- off_t charDelta = n%_charsPerByte;
-
- // carry
- if ( charDelta + _charOffset >= _charsPerByte ) {
- // Note: this cannot overflow unless chars perbyte == 1
- if ( byteDelta == MAX_OFFSET ) {
- throw out_of_range("Cursor increment exceeded maximum offset.\n");
- }
- byteDelta++;
- }
- // if out of range, just leave the char offset where it is
- if( byteDelta && OutOfRange == incrByByte( byteDelta ) ) {
- return _charOffset;
- }
- // limit _charOffset to _charsPerByte - 1
- _charOffset = (charDelta + _charOffset)%_charsPerByte;
- return _charOffset;
-}
-
-off_t Cursor::incrByByte( off_t byteDelta )
-{
- if ( byteDelta > MAX_OFFSET - _byteOffset ) {
- throw out_of_range("Cursor increment exceeded maximum offset.\n");
- }
- if ( _byteOffset + byteDelta >= _high )
- return OutOfRange;
- return (_byteOffset += byteDelta);
-}
-
-//
-// accessor implimentations
-//
-off_t Cursor::byteOffset() const
-{
- return _byteOffset;
-}
-off_t Cursor::charOffset() const
-{
- return _charOffset;
-}
-#define MIN(a,b) (a < b)?a:b
-off_t Cursor::setCharsPerByte( off_t charsPerByte )
-{
- _charsPerByte = charsPerByte;
- _charOffset = MIN(_charOffset,charsPerByte-1);
- return _charsPerByte;
-}
-// _byteOffset values are clamped to:
-// [_low,_high)
-// _charOffset values are clamped to:
-// [0,_charsPerByte-1]
-void Cursor::setOffset( off_t byteOffset, off_t charOffset )
-{
- assignClamped(_byteOffset,byteOffset,0,_high);
- assignClamped(_charOffset,charOffset,0,_charsPerByte);
-}
-off_t Cursor::charOffsetAbsolute() const
-{
- return _byteOffset*_charsPerByte + _charOffset;
-}
-//
-// void Cursor::assignClamped(dst,src, low,high);
-// convienience function for assigning dst = src
-// clamped to [low,high)
-//
-void Cursor::assignClamped(off_t& dst, off_t src, off_t low, off_t high)
-{
- if( src < low ) {
- dst = low;
- } else if( src >= high ) {
- dst = high-1;
- } else {
- dst = src;
- }
-}