349 lines
7.4 KiB
C
349 lines
7.4 KiB
C
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/*
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* misc conversion functions between pg_wchar and other encodings.
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* Tatsuo Ishii
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* $Id: utils.c,v 1.1 1998/03/15 07:38:39 scrappy Exp $
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*/
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#include <regex/pg_wchar.h>
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/*
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* convert EUC to pg_wchar (EUC process code)
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* caller should allocate enough space for "to"
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*/
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static void pg_euc2wchar(const unsigned char *from, pg_wchar *to)
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{
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while (*from) {
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if (*from == SS2) {
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from++;
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*to = *from++;
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} else if (*from == SS3) {
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from++;
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*to = *from++ << 8;
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*to |= 0x3f & *from++;
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} else if (*from & 0x80) {
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*to = *from++ << 8;
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*to |= *from++;
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} else {
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*to = *from++;
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}
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to++;
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}
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*to = 0;
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}
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static void pg_eucjp2wchar(const unsigned char *from, pg_wchar *to)
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{
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pg_euc2wchar(from,to);
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}
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static void pg_euckr2wchar(const unsigned char *from, pg_wchar *to)
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{
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pg_euc2wchar(from,to);
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}
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static void pg_eucch2wchar(const unsigned char *from, pg_wchar *to)
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{
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while (*from) {
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if (*from == SS2) {
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from++;
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*to = 0x3f00 & (*from++ << 8);
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*to = *from++;
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} else if (*from == SS3) {
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from++;
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*to = *from++ << 8;
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*to |= 0x3f & *from++;
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} else if (*from & 0x80) {
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*to = *from++ << 8;
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*to |= *from++;
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} else {
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*to = *from++;
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}
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to++;
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}
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*to = 0;
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}
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static void pg_euccn2wchar(const unsigned char *from, pg_wchar *to)
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{
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while (*from) {
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if (*from == SS2) {
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from++;
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*to = *from++ << 16;
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*to |= *from++ << 8;
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*to |= *from++;
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} else if (*from == SS3) {
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from++;
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*to = *from++ << 8;
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*to |= 0x3f & *from++;
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} else if (*from & 0x80) {
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*to = *from++ << 8;
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*to |= *from++;
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} else {
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*to = *from++;
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}
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to++;
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}
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*to = 0;
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}
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/*
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* convert UTF-8 to pg_wchar (UCS-2)
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* caller should allocate enough space for "to"
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*/
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static void pg_utf2wchar(const unsigned char *from, pg_wchar *to)
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{
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unsigned char c1,c2,c3;
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while (*from) {
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if ((*from & 0x80) == 0) {
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*to = *from++;
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} else if ((*from & 0xe0) == 0xc0) {
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c1 = *from++ & 0x1f;
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c2 = *from++ & 0x3f;
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*to = c1 << 6;
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*to |= c2;
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} else if ((*from & 0xe0) == 0xe0) {
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c1 = *from++ & 0x0f;
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c2 = *from++ & 0x3f;
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c3 = *from++ & 0x3f;
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*to = c1 << 12;
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*to |= c2 << 6;
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*to |= c3;
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}
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to++;
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}
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*to = 0;
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}
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/*
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* convert mule internal code to pg_wchar.
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* in this case pg_wchar consists of following 4 bytes:
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*
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* 0x00(unused)
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* 0x00(ASCII)|leading character (one of LC1, LC12, LC2 or LC22)
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* 0x00(ASCII,1 byte code)|other than 0x00(2 byte code)
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* the lowest byte of the code
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*
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* note that Type N (variable length byte encoding) cannot be represented by
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* this schema. sorry.
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* caller should allocate enough space for "to"
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*/
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static void pg_mule2wchar(const unsigned char *from, pg_wchar *to)
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{
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while (*from) {
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if (IS_LC1(*from)) {
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*to = *from++ << 16;
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*to |= *from++;
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} else if (IS_LCPRV1(*from)) {
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from++;
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*to = *from++ << 16;
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*to |= *from++;
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} else if (IS_LC2(*from)) {
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*to = *from++ << 16;
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*to |= *from++ << 8;
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*to |= *from++;
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} else if (IS_LCPRV2(*from)) {
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from++;
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*to = *from++ << 16;
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*to |= *from++ << 8;
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*to |= *from++;
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} else { /* assume ASCII */
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*to = *from++;
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}
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to++;
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}
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*to = 0;
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}
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/*
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* convert EUC to pg_wchar (EUC process code)
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* caller should allocate enough space for "to"
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* len: length of from.
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* "from" not necessarily null terminated.
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*/
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static void pg_euc2wchar_with_len(const unsigned char *from, pg_wchar *to, int len)
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{
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while (*from && len > 0) {
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if (*from == SS2) {
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from++;
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len--;
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*to = 0xff & *from++;
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len--;
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} else if (*from == SS3) {
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from++;
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*to = *from++ << 8;
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*to |= 0x3f & *from++;
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len -= 3;
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} else if (*from & 0x80) {
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*to = *from++ << 8;
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*to |= *from++;
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len -= 2;
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} else {
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*to = *from++;
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len--;
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}
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to++;
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}
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*to = 0;
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}
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static void pg_eucjp2wchar_with_len
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(const unsigned char *from, pg_wchar *to, int len)
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{
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pg_euc2wchar_with_len(from,to,len);
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}
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static void pg_euckr2wchar_with_len
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(const unsigned char *from, pg_wchar *to, int len)
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{
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pg_euc2wchar_with_len(from,to,len);
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}
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static void pg_eucch2wchar_with_len
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(const unsigned char *from, pg_wchar *to, int len)
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{
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while (*from && len > 0) {
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if (*from == SS2) {
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from++;
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len--;
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*to = 0x3f00 & (*from++ << 8);
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*to = *from++;
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len -= 2;
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} else if (*from == SS3) {
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from++;
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*to = *from++ << 8;
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*to |= 0x3f & *from++;
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len -= 3;
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} else if (*from & 0x80) {
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*to = *from++ << 8;
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*to |= *from++;
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len -= 2;
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} else {
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*to = *from++;
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len--;
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}
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to++;
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}
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*to = 0;
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}
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static void pg_euccn2wchar_with_len
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(const unsigned char *from, pg_wchar *to, int len)
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{
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while (*from && len > 0) {
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if (*from == SS2) {
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from++;
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len--;
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*to = *from++ << 16;
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*to |= *from++ << 8;
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*to |= *from++;
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len -= 3;
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} else if (*from == SS3) {
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from++;
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*to = *from++ << 8;
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*to |= 0x3f & *from++;
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len -= 3;
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} else if (*from & 0x80) {
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*to = *from++ << 8;
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*to |= *from++;
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len -= 2;
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} else {
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*to = *from++;
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len--;
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}
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to++;
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}
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*to = 0;
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}
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/*
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* convert UTF-8 to pg_wchar (UCS-2)
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* caller should allocate enough space for "to"
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* len: length of from.
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* "from" not necessarily null terminated.
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*/
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static void pg_utf2wchar_with_len(const unsigned char *from, pg_wchar *to, int len)
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{
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unsigned char c1,c2,c3;
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while (*from && len > 0) {
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if ((*from & 0x80) == 0) {
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*to = *from++;
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len--;
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} else if ((*from & 0xe0) == 0xc0) {
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c1 = *from++ & 0x1f;
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c2 = *from++ & 0x3f;
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len -= 2;
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*to = c1 << 6;
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*to |= c2;
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} else if ((*from & 0xe0) == 0xe0) {
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c1 = *from++ & 0x0f;
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c2 = *from++ & 0x3f;
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c3 = *from++ & 0x3f;
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len -= 3;
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*to = c1 << 12;
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*to |= c2 << 6;
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*to |= c3;
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}
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to++;
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}
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*to = 0;
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}
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/*
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* convert mule internal code to pg_wchar
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* caller should allocate enough space for "to"
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* len: length of from.
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* "from" not necessarily null terminated.
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*/
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static void pg_mule2wchar_with_len(const unsigned char *from, pg_wchar *to, int len)
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{
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while (*from && len > 0) {
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if (IS_LC1(*from)) {
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*to = *from++ << 16;
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*to |= *from++;
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len -= 2;
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} else if (IS_LCPRV1(*from)) {
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from++;
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*to = *from++ << 16;
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*to |= *from++;
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len -= 3;
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} else if (IS_LC2(*from)) {
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*to = *from++ << 16;
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*to |= *from++ << 8;
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*to |= *from++;
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len -= 3;
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} else if (IS_LCPRV2(*from)) {
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from++;
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*to = *from++ << 16;
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*to |= *from++ << 8;
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*to |= *from++;
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len -= 4;
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} else { /* assume ASCII */
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*to = (unsigned char)*from++;
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len--;
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}
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to++;
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}
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*to = 0;
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}
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typedef struct {
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void (*mb2wchar)();
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void (*mb2wchar_with_len)();
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} pg_wchar_tbl;
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static pg_wchar_tbl pg_wchar_table[] = {
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{pg_eucjp2wchar, pg_eucjp2wchar_with_len},
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{pg_eucch2wchar, pg_eucch2wchar_with_len},
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{pg_euckr2wchar, pg_euckr2wchar_with_len},
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{pg_euccn2wchar, pg_euccn2wchar_with_len},
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{pg_utf2wchar, pg_utf2wchar_with_len},
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{pg_mule2wchar, pg_mule2wchar_with_len}};
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void pg_mb2wchar(const unsigned char *from, pg_wchar *to)
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{
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(*pg_wchar_table[MB].mb2wchar)(from,to);
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}
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void pg_mb2wchar_with_len(const unsigned char *from, pg_wchar *to, int len)
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{
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(*pg_wchar_table[MB].mb2wchar_with_len)(from,to,len);
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}
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