// Copyright (c) 2005, Niels Martin Hansen
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
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// Aegisub Project http://www.aegisub.org/
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// $Id$

/// @file string_codec.cpp
/// @brief Encode and decode strings so they can safely be stored inside fields in SSA/ASS files
/// @ingroup utility
///

// Functions for inline string encoding.
// See header file for details.

#include "config.h"

#include "string_codec.h"

/// @brief DOCME
/// @param input
/// @return
///
wxString inline_string_encode(const wxString &input)
{
	const size_t inlen = input.length();
	wxString output("");
	output.Alloc(inlen);
	for (size_t i = 0; i < inlen; i++) {
		wxChar c = input[i];
		if (c <= 0x1F || c == 0x23 || c == 0x2C || c == 0x3A || c == 0x7C) {
			output << wxString::Format("#%02X", c);
		} else {
			output << c;
		}
	}
	return output;
}


/// @brief DOCME
/// @param input
///
wxString inline_string_decode(const wxString &input)
{
	const size_t inlen = input.length();
	wxString output("");
	output.Alloc(inlen);
	size_t i = 0;
	while (i < inlen) {
		if (input[i] == '#') {
			// check if there's actually enough extra characters at the end of the string
			if (inlen - i < 3)
				break;
			wxString charcode = input.Mid(i+1, 2);
			long c;
			if (charcode.ToLong(&c, 16)) {
				output << (wchar_t)c;
			}
			i += 3;
		} else {
			output << input[i++];
		}
	}
	return output;
}