http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/wvstreams/wvbackslash.h

/* -*- Mode: C++ -*- * Worldvisions Weaver Software: * Copyright (C) 2002 Net Integration Technologies, Inc. * * C-style backslash escaping and unescaping of strings. */ #ifndef __WVBACKSLASH_H #define __WVBACKSLASH_H #include "wvencoder.h" /** * An encoder that performs C-style backslash escaping of strings. * * Use this to escape control characters, unprintable characters, * and optionally quotes or any other special printable characters * into sequences of the form \\n, \\xFF, \\", etc... * * Supports reset(). * */ class WvBackslashEncoder : public WvEncoder { WvString nasties; public: /** * Creates a C-style backslash encoder. * nasties - the set of printable characters to escape * in addition to the non-printable ones * (should always contain at least backslash) */ WvBackslashEncoder(WvStringParm _nasties = "\\\""); virtual ~WvBackslashEncoder() { } protected: virtual bool _encode(WvBuf &inbuf, WvBuf &outbuf, bool flush); virtual bool _reset(); }; /** * An encoder that performs C-style backslash unescaping of strings. * * Recognizes the following sequences preceeded by backslash: * * - a: substitutes alarm bell (ascii 7) * - b: substitutes backspace (ascii 8) * - f: substitutes formfeed (ascii 12) * - n: substitutes newline (ascii 10) * - r: substitutes carriage return (ascii 13) * - t: substitutes tab (ascii 9) * - v: substitutes vertical tab (ascii 11) * - 0: substitutes null (ascii 0) * - 0xyz: substitutes character with octal encoding xyz * - xxy: substitutes character with hex encoding xy * - newline: substitutes space (line continuation sequence) * - \\: substitutes backslash * - otherwise substitutes the next character (strips the backslash) * * * Supports reset(). * */ class WvBackslashDecoder : public WvEncoder { enum State { Initial, Escape, Hex1, Hex2, Octal1, Octal2, Octal3 }; State state; WvInPlaceBuf tmpbuf; int value; public: /** Creates a C-style backslash decoder. */ WvBackslashDecoder(); virtual ~WvBackslashDecoder() { } protected: virtual bool _encode(WvBuf &inbuf, WvBuf &outbuf, bool flush); virtual bool _reset(); private: bool flushtmpbuf(WvBuf &outbuf); }; #endif // __WVBACKSLASH_H