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diff --git a/graphics/asymptote/prc/PRCTools/bitData.h b/graphics/asymptote/prc/PRCTools/bitData.h
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+/************
+*
+* This file is part of a tool for reading 3D content in the PRC format.
+* Copyright (C) 2008 Orest Shardt <shardtor (at) gmail dot com>
+*
+* This program is free software: you can redistribute it and/or modify
+* it under the terms of the GNU Lesser General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* 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 Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public License
+* along with this program. If not, see <http://www.gnu.org/licenses/>.
+*
+*************/
+
+#ifndef __BITDATA_H
+#define __BITDATA_H
+
+#include <iostream>
+#include <string>
+
+struct BitPosition
+{
+ unsigned int byteIndex;
+ unsigned int bitIndex;
+};
+
+class BitByBitData
+{
+ public:
+ BitByBitData(char* s,unsigned int l) : start(s),data(s),length(l),
+ bitMask(0x80),showBits(false),failed(false) {}
+
+ void tellPosition();
+ BitPosition getPosition();
+ void setPosition(const BitPosition&);
+ void setPosition(unsigned int,unsigned int);
+ void setShowBits(bool);
+ bool readBit();
+ unsigned char readChar();
+
+ unsigned int readUnsignedInt();
+ std::string readString();
+ int readInt();
+ double readDouble();
+
+ private:
+ char *start; // first byte so we know where we are
+ char *data; // last byte read
+ unsigned int length;
+ unsigned char bitMask; // mask to read next bit of current byte
+ bool showBits; // show each bit read?
+ bool failed;
+ void nextBit(); // shift bit mask and get next byte if needed
+};
+
+#endif // __BITDATA_H