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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