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//
// VMime library (http://www.vmime.org)
// Copyright (C) 2002 Vincent Richard <vincent@vmime.org>
//
// 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; 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
// 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.
//
// Linking this library statically or dynamically with other modules is making
// a combined work based on this library. Thus, the terms and conditions of
// the GNU General Public License cover the whole combination.
//
#ifndef VMIME_PARSERHELPERS_HPP_INCLUDED
#define VMIME_PARSERHELPERS_HPP_INCLUDED
#include "vmime/types.hpp"
#include "vmime/utility/stringUtils.hpp"
#include <algorithm>
namespace vmime {
class parserHelpers {
public:
static bool isSpace(const char_t c) {
return c == ' ' || c == '\t' || c == '\n' || c == '\r';
}
static bool isSpaceOrTab(const char_t c) {
return c == ' ' || c == '\t';
}
static bool isDigit(const char_t c) {
return c >= '0' && c <= '9';
}
static bool isAlpha(const char_t c) {
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z');
}
static char_t toLower(const char_t c) {
if (c >= 'A' && c <= 'Z') {
return ('a' + (c - 'A'));
} else {
return c;
}
}
// Checks whether a character is in the 7-bit US-ASCII charset
static bool isAscii(const char_t c) {
const unsigned int x = static_cast <unsigned int>(c);
return x <= 127;
}
// Checks whether a character has a visual representation
static bool isPrint(const char_t c) {
const unsigned int x = static_cast <unsigned int>(c);
return x >= 0x20 && x <= 0x7E;
}
/** Finds the next EOL sequence in the specified buffer.
* An EOL sequence may be a CR+LF sequence, or a LF sequence.
*
* @param buffer search buffer
* @param currentPos start searching from this position
* @param end stop searching at this position
* @param eol will receive the position after the EOL sequence
* @return true if an EOL sequence has been found, or false if
* no EOL sequence was found before the end of the buffer
*/
static bool findEOL(
const string& buffer,
const size_t currentPos,
const size_t end,
size_t* eol
) {
size_t pos = currentPos;
if (pos == end) {
return false;
}
while (pos < end) {
if (buffer[pos] == '\r' && pos + 1 < end && buffer[pos + 1] == '\n') {
*eol = pos + 2;
return true;
} else if (buffer[pos] == '\n') {
*eol = pos + 1;
return true;
}
++pos;
}
*eol = end;
return true;
}
};
} // vmime
#endif // VMIME_PARSERHELPERS_HPP_INCLUDED
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