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+/* Tables for conversion to and from ISO-IR-165.
+ converting from UCS using gaps.
+ Copyright (C) 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _ISO_IR_165_H
+#define _ISO_IR_165_H 1
+
+#include <gconv.h>
+#include <stdint.h>
+
+struct gap
+{
+ uint16_t start;
+ uint16_t end;
+ int32_t idx;
+};
+
+/* Table for ISO-IR-165 (CCITT Chinese) to UCS4 conversion. */
+#define ISOIR165_FROMSIZE 0x2284
+extern const uint16_t __isoir165_to_tab[ISOIR165_FROMSIZE];
+
+
+/* XXX If we at some point need an offset value to decode the byte
+ sequences another parameter can be added. */
+static inline uint32_t
+ucs4_from_isoir165 (const char **s, size_t avail)
+{
+ unsigned char ch = *(*s);
+ unsigned char ch2;
+
+ if (ch <= 0x20 || ch >= 0x7f)
+ return __UNKNOWN_10646_CHAR;
+
+ if (avail < 2)
+ return 0;
+
+ ch2 = (*s)[1];
+ if (ch2 <= 0x20 || ch2 >= 0x7f)
+ return __UNKNOWN_10646_CHAR;
+
+ return (__isoir165_to_tab[(ch - 0x21) * 94 + (ch2 - 0x21)]
+ ?: __UNKNOWN_10646_CHAR);
+}
+
+
+/* Tables for ISO-IR-165 (CCITT Chinese) from UCS4 conversion. */
+extern const struct gap __isoir165_from_idx[];
+extern const char __isoir165_from_tab[];
+
+static inline size_t
+ucs4_to_isoir165 (uint32_t wch, char *s, size_t avail)
+{
+ unsigned int ch = (unsigned int) wch;
+ const char *cp;
+ const struct gap *rp = __isoir165_from_idx;
+
+ if (ch > 0xffe5)
+ /* This is an illegal character. */
+ return __UNKNOWN_10646_CHAR;
+
+ while (ch > rp->end)
+ ++rp;
+ if (ch < rp->start)
+ /* This is an illegal character. */
+ return __UNKNOWN_10646_CHAR;
+
+ /* The two bytes following the index given in this record give the
+ encoding in ISO-IR-165. Unless the bytes are zero. */
+ cp = &__isoir165_from_tab[(ch + rp->idx) * 2];
+ if (*cp == '\0')
+ /* This is an illegal character. */
+ return __UNKNOWN_10646_CHAR;
+
+ if (avail < 2)
+ return 0;
+
+ s[0] = cp[0];
+ s[1] = cp[1];
+
+ return 2;
+}
+
+#endif /* iso-ir-165.h */