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authorReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
committerReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
commitf4092abdf94af6a99aff944d6264bc1284e8bdd4 (patch)
tree2ac1c9cc16ceb93edb2c4382c088dac5aeafdf0f /nx-X11/lib/X11/lcUniConv/big5_emacs.h
parenta840692edc9c6d19cd7c057f68e39c7d95eb767d (diff)
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Summary: Imported nx-X11-3.1.0-1.tar.gz Keywords: Imported nx-X11-3.1.0-1.tar.gz into Git repository
Diffstat (limited to 'nx-X11/lib/X11/lcUniConv/big5_emacs.h')
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diff --git a/nx-X11/lib/X11/lcUniConv/big5_emacs.h b/nx-X11/lib/X11/lcUniConv/big5_emacs.h
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@@ -0,0 +1,164 @@
+/* $XFree86$ */
+
+/*
+ * BIG5-0 and BIG5-1
+ */
+
+/*
+ BIG5 with its 13494 characters doesn't fit in a single 94x94 or 96x96
+ block. Therefore Emacs/Mule developers, in a typically Japanese way of
+ thinking, have developed an alternative encoding of BIG5 in two 94x94
+ planes, very similar to the SHIFT_JIS encoding for JISX0208.
+
+ Conversion between BIG5 codes (s1,s2) and BIG5-0 codes (c1,c2):
+ Example. (s1,s2) = 0xA140, (c1,c2) = 0x2121.
+ 0xA1 <= s1 <= 0xC7, 0x40 <= s2 <= 0x7E || 0xA1 <= s2 <= 0xFE,
+ 0x21 <= c1 <= 0x62, 0x21 <= c2 <= 0x7E.
+ Invariant:
+ 157*(s1-0xA1) + (s2 < 0x80 ? s2-0x40 : s2-0x62)
+ = 94*(c1-0x21)+(c2-0x21)
+ Conversion (s1,s2) -> (c1,c2):
+ t := 157*(s1-0xA1) + (s2 < 0x80 ? s2-0x40 : s2-0x62)
+ c1 := (t div 94) + 0x21
+ c2 := (t mod 94) + 0x21
+ Conversion (c1,c2) -> (s1,s2):
+ t := 94*(c1-0x21)+(c2-0x21)
+ t2 := t mod 157
+ s1 := (t div 157) + 0xA1
+ s2 := (t2 < 0x3F ? t2+0x40 : t2+0x62)
+
+ Conversion between BIG5 codes (s1,s2) and BIG5-1 codes (c1,c2):
+ Example. (s1,s2) = 0xC940, (c1,c2) = 0x2121.
+ 0xC9 <= s1 <= 0xF9, 0x40 <= s2 <= 0x7E || 0xA1 <= s2 <= 0xFE,
+ 0x21 <= c1 <= 0x72, 0x21 <= c2 <= 0x7E.
+ Invariant:
+ 157*(s1-0xC9) + (s2 < 0x80 ? s2-0x40 : s2-0x62)
+ = 94*(c1-0x21)+(c2-0x21)
+ Conversion (s1,s2) -> (c1,c2):
+ t := 157*(s1-0xC9) + (s2 < 0x80 ? s2-0x40 : s2-0x62)
+ c1 := (t div 94) + 0x21
+ c2 := (t mod 94) + 0x21
+ Conversion (c1,c2) -> (s1,s2):
+ t := 94*(c1-0x21)+(c2-0x21)
+ t2 := t mod 157
+ s1 := (t div 157) + 0xC9
+ s2 := (t2 < 0x3F ? t2+0x40 : t2+0x62)
+ */
+
+static int
+big5_0_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
+{
+ unsigned char c1 = s[0];
+ if (c1 >= 0x21 && c1 <= 0x62) {
+ if (n >= 2) {
+ unsigned char c2 = s[1];
+ if (c2 >= 0x21 && c2 <= 0x7e) {
+ unsigned int i = 94 * (c1 - 0x21) + (c2 - 0x21);
+ if (0) {
+ /* Unoptimized. */
+ unsigned char buf[2];
+ buf[0] = (i / 157) + 0xa1;
+ i = i % 157;
+ buf[1] = i + (i < 0x3f ? 0x40 : 0x62);
+ return big5_mbtowc(conv,pwc,buf,2);
+ } else {
+ /* Inline the implementation of big5_mbtowc. */
+ if (i < 6121) {
+ unsigned short wc = big5_2uni_pagea1[i];
+ if (wc != 0xfffd) {
+ *pwc = (ucs4_t) wc;
+ return 2;
+ }
+ }
+ }
+ }
+ return RET_ILSEQ;
+ }
+ return RET_TOOFEW(0);
+ }
+ return RET_ILSEQ;
+}
+
+static int
+big5_1_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
+{
+ unsigned char c1 = s[0];
+ if (c1 >= 0x21 && c1 <= 0x72) {
+ if (n >= 2) {
+ unsigned char c2 = s[1];
+ if (c2 >= 0x21 && c2 <= 0x7e) {
+ unsigned int i = 94 * (c1 - 0x21) + (c2 - 0x21);
+ if (0) {
+ /* Unoptimized. */
+ unsigned char buf[2];
+ buf[0] = (i / 157) + 0xc9;
+ i = i % 157;
+ buf[1] = i + (i < 0x3f ? 0x40 : 0x62);
+ return big5_mbtowc(conv,pwc,buf,2);
+ } else {
+ /* Inline the implementation of big5_mbtowc. */
+ if (i < 7652) {
+ unsigned short wc = big5_2uni_pagec9[i];
+ if (wc != 0xfffd) {
+ *pwc = (ucs4_t) wc;
+ return 2;
+ }
+ }
+ }
+ }
+ return RET_ILSEQ;
+ }
+ return RET_TOOFEW(0);
+ }
+ return RET_ILSEQ;
+}
+
+static int
+big5_0_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
+{
+ if (n >= 2) {
+ unsigned char buf[2];
+ int ret = big5_wctomb(conv,buf,wc,2);
+ if (ret != RET_ILSEQ) {
+ unsigned char s1, s2;
+ if (ret != 2) abort();
+ s1 = buf[0];
+ s2 = buf[1];
+ if (!(s1 >= 0xa1)) abort();
+ if (!((s2 >= 0x40 && s2 <= 0x7e) || (s2 >= 0xa1 && s2 <= 0xfe))) abort();
+ if (s1 < 0xc9) {
+ unsigned int t = 157 * (s1 - 0xa1) + s2 - (s2 < 0x80 ? 0x40 : 0x62);
+ r[0] = (t / 94) + 0x21;
+ r[1] = (t % 94) + 0x21;
+ return 2;
+ }
+ }
+ return RET_ILSEQ;
+ }
+ return RET_TOOSMALL;
+}
+
+static int
+big5_1_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
+{
+ if (n >= 2) {
+ unsigned char buf[2];
+ int ret = big5_wctomb(conv,buf,wc,2);
+ if (ret != RET_ILSEQ) {
+ unsigned char s1, s2;
+ if (ret != 2) abort();
+ s1 = buf[0];
+ s2 = buf[1];
+ if (!(s1 <= 0xf9)) abort();
+ if (!((s2 >= 0x40 && s2 <= 0x7e) || (s2 >= 0xa1 && s2 <= 0xfe))) abort();
+ if (s1 >= 0xc9) {
+ unsigned int t = 157 * (s1 - 0xc9) + s2 - (s2 < 0x80 ? 0x40 : 0x62);
+ r[0] = (t / 94) + 0x21;
+ r[1] = (t % 94) + 0x21;
+ return 2;
+ }
+ }
+ return RET_ILSEQ;
+ }
+ return RET_TOOSMALL;
+}