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authorgeronimo <geronimo013@gmx.de>2012-07-13 04:26:40 +0200
committergeronimo <geronimo013@gmx.de>2012-07-13 04:26:40 +0200
commit2d48ae784ea6828e8626c32c848f64232d8f35c0 (patch)
treefab114b03e91125783a778b835dd1913b039cebe /libs/vdr/include/CharsetConv.h
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+/**
+ * File: CharsetConv.h
+ * Project: libvdr - classes taken from vdr-project
+ *
+ * from "Video Disk Recorder":
+ *
+ * Copyright (C) 2000, 2003, 2006, 2008 Klaus Schmidinger
+ *
+ * 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 2
+ * 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
+ * Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ *
+ * The original author can be reached at kls@tvdr.de
+ *
+ * The vdr project's page is at http://www.tvdr.de
+ *
+ */
+#ifndef CHARSETCONV_H
+#define CHARSETCONV_H
+
+#include <stddef.h>
+#include <sys/types.h>
+#include <iconv.h>
+typedef unsigned char uchar;
+
+// When handling strings that might contain UTF-8 characters, it may be necessary
+// to process a "symbol" that consists of several actual character bytes. The
+// following functions allow transparently accessing a "char *" string without
+// having to worry about what character set is actually used.
+
+int Utf8CharLen(const char *s);
+ ///< Returns the number of character bytes at the beginning of the given
+ ///< string that form a UTF-8 symbol.
+uint Utf8CharGet(const char *s, int Length = 0);
+ ///< Returns the UTF-8 symbol at the beginning of the given string.
+ ///< Length can be given from a previous call to Utf8CharLen() to avoid calculating
+ ///< it again. If no Length is given, Utf8CharLen() will be called.
+int Utf8CharSet(uint c, char *s = NULL);
+ ///< Converts the given UTF-8 symbol to a sequence of character bytes and copies
+ ///< them to the given string. Returns the number of bytes written. If no string
+ ///< is given, only the number of bytes is returned and nothing is copied.
+int Utf8SymChars(const char *s, int Symbols);
+ ///< Returns the number of character bytes at the beginning of the given
+ ///< string that form at most the given number of UTF-8 symbols.
+int Utf8StrLen(const char *s);
+ ///< Returns the number of UTF-8 symbols formed by the given string of
+ ///< character bytes.
+char *Utf8Strn0Cpy(char *Dest, const char *Src, int n);
+ ///< Copies at most n character bytes from Src to Dest, making sure that the
+ ///< resulting copy ends with a complete UTF-8 symbol. The copy is guaranteed
+ ///< to be zero terminated.
+ ///< Returns a pointer to Dest.
+int Utf8ToArray(const char *s, uint *a, int Size);
+ ///< Converts the given character bytes (including the terminating 0) into an
+ ///< array of UTF-8 symbols of the given Size. Returns the number of symbols
+ ///< in the array (without the terminating 0).
+int Utf8FromArray(const uint *a, char *s, int Size, int Max = -1);
+ ///< Converts the given array of UTF-8 symbols (including the terminating 0)
+ ///< into a sequence of character bytes of at most Size length. Returns the
+ ///< number of character bytes written (without the terminating 0).
+ ///< If Max is given, only that many symbols will be converted.
+ ///< The resulting string is always zero-terminated if Size is big enough.
+
+// When allocating buffer space, make sure we reserve enough space to hold
+// a string in UTF-8 representation:
+
+#define Utf8BufSize(s) ((s) * 4)
+
+// The following macros automatically use the correct versions of the character
+// class functions:
+
+#define Utf8to(conv, c) (cCharSetConv::SystemCharacterTable() ? to##conv(c) : tow##conv(c))
+#define Utf8is(ccls, c) (cCharSetConv::SystemCharacterTable() ? is##ccls(c) : isw##ccls(c))
+
+class cCharSetConv {
+public:
+ cCharSetConv(const char *FromCode = NULL, const char *ToCode = NULL);
+ ///< Sets up a character set converter to convert from FromCode to ToCode.
+ ///< If FromCode is NULL, the previously set systemCharacterTable is used
+ ///< (or "UTF-8" if no systemCharacterTable has been set).
+ ///< If ToCode is NULL, "UTF-8" is used.
+ ~cCharSetConv();
+ const char *Convert(const char *From, char *To = NULL, size_t ToLength = 0);
+ ///< Converts the given Text from FromCode to ToCode (as set in the constructor).
+ ///< If To is given, it is used to copy at most ToLength bytes of the result
+ ///< (including the terminating 0) into that buffer. If To is not given,
+ ///< the result is copied into a dynamically allocated buffer and is valid as
+ ///< long as this object lives, or until the next call to Convert(). The
+ ///< return value always points to the result if the conversion was successful
+ ///< (even if a fixed size To buffer was given and the result didn't fit into
+ ///< it). If the string could not be converted, the result points to the
+ ///< original From string.
+ static const char *SystemCharacterTable(void) { return systemCharacterTable; }
+ static void SetSystemCharacterTable(const char *CharacterTable);
+
+private:
+ iconv_t cd;
+ char *result;
+ size_t length;
+ static char *systemCharacterTable;
+ };
+
+#endif /* CHARSETCONV_H */
+