wchar.c
上传用户:blenddy
上传日期:2007-01-07
资源大小:6495k
文件大小:8k
- /*
- * conversion functions between pg_wchar and multi-byte streams.
- * Tatsuo Ishii
- * $Id: wchar.c,v 1.9 1999/07/11 22:47:20 ishii Exp $
- *
- * WIN1250 client encoding updated by Pavel Behal
- *
- */
- #include "mb/pg_wchar.h"
- /*
- * conversion to pg_wchar is done by "table driven."
- * to add an encoding support, define mb2wchar_with_len(), mblen()
- * for the particular encoding. Note that if the encoding is only
- * supported in the client, you don't need to define
- * mb2wchar_with_len() function (SJIS is the case).
- */
- /*
- * SQL/ASCII
- */
- static void pg_ascii2wchar_with_len
- (const unsigned char *from, pg_wchar * to, int len)
- {
- while (*from && len > 0)
- {
- *to++ = *from++;
- len--;
- }
- *to = 0;
- }
- static int
- pg_ascii_mblen(const unsigned char *s)
- {
- return (1);
- }
- /*
- * EUC
- */
- static void pg_euc2wchar_with_len
- (const unsigned char *from, pg_wchar * to, int len)
- {
- while (*from && len > 0)
- {
- if (*from == SS2)
- {
- from++;
- len--;
- *to = 0xff & *from++;
- len--;
- }
- else if (*from == SS3)
- {
- from++;
- *to = *from++ << 8;
- *to |= 0x3f & *from++;
- len -= 3;
- }
- else if (*from & 0x80)
- {
- *to = *from++ << 8;
- *to |= *from++;
- len -= 2;
- }
- else
- {
- *to = *from++;
- len--;
- }
- to++;
- }
- *to = 0;
- }
- static int
- pg_euc_mblen(const unsigned char *s)
- {
- int len;
- if (*s == SS2)
- len = 2;
- else if (*s == SS3)
- len = 3;
- else if (*s & 0x80)
- len = 2;
- else
- len = 1;
- return (len);
- }
- /*
- * EUC_JP
- */
- static void pg_eucjp2wchar_with_len
- (const unsigned char *from, pg_wchar * to, int len)
- {
- pg_euc2wchar_with_len(from, to, len);
- }
- static int
- pg_eucjp_mblen(const unsigned char *s)
- {
- return (pg_euc_mblen(s));
- }
- /*
- * EUC_KR
- */
- static void pg_euckr2wchar_with_len
- (const unsigned char *from, pg_wchar * to, int len)
- {
- pg_euc2wchar_with_len(from, to, len);
- }
- static int
- pg_euckr_mblen(const unsigned char *s)
- {
- return (pg_euc_mblen(s));
- }
- /*
- * EUC_CN
- */
- static void pg_euccn2wchar_with_len
- (const unsigned char *from, pg_wchar * to, int len)
- {
- while (*from && len > 0)
- {
- if (*from == SS2)
- {
- from++;
- len--;
- *to = 0x3f00 & (*from++ << 8);
- *to = *from++;
- len -= 2;
- }
- else if (*from == SS3)
- {
- from++;
- *to = *from++ << 8;
- *to |= 0x3f & *from++;
- len -= 3;
- }
- else if (*from & 0x80)
- {
- *to = *from++ << 8;
- *to |= *from++;
- len -= 2;
- }
- else
- {
- *to = *from++;
- len--;
- }
- to++;
- }
- *to = 0;
- }
- static int
- pg_euccn_mblen(const unsigned char *s)
- {
- int len;
- if (*s == SS2)
- len = 3;
- else if (*s == SS3)
- len = 3;
- else if (*s & 0x80)
- len = 2;
- else
- len = 1;
- return (len);
- }
- /*
- * EUC_TW
- */
- static void pg_euctw2wchar_with_len
- (const unsigned char *from, pg_wchar * to, int len)
- {
- while (*from && len > 0)
- {
- if (*from == SS2)
- {
- from++;
- len--;
- *to = *from++ << 16;
- *to |= *from++ << 8;
- *to |= *from++;
- len -= 3;
- }
- else if (*from == SS3)
- {
- from++;
- *to = *from++ << 8;
- *to |= 0x3f & *from++;
- len -= 3;
- }
- else if (*from & 0x80)
- {
- *to = *from++ << 8;
- *to |= *from++;
- len -= 2;
- }
- else
- {
- *to = *from++;
- len--;
- }
- to++;
- }
- *to = 0;
- }
- static int
- pg_euctw_mblen(const unsigned char *s)
- {
- int len;
- if (*s == SS2)
- len = 4;
- else if (*s == SS3)
- len = 3;
- else if (*s & 0x80)
- len = 2;
- else
- len = 1;
- return (len);
- }
- /*
- * convert UTF-8 to pg_wchar (UCS-2)
- * caller should allocate enough space for "to"
- * len: length of from.
- * "from" not necessarily null terminated.
- */
- static void
- pg_utf2wchar_with_len(const unsigned char *from, pg_wchar * to, int len)
- {
- unsigned char c1,
- c2,
- c3;
- while (*from && len > 0)
- {
- if ((*from & 0x80) == 0)
- {
- *to = *from++;
- len--;
- }
- else if ((*from & 0xe0) == 0xc0)
- {
- c1 = *from++ & 0x1f;
- c2 = *from++ & 0x3f;
- len -= 2;
- *to = c1 << 6;
- *to |= c2;
- }
- else if ((*from & 0xe0) == 0xe0)
- {
- c1 = *from++ & 0x0f;
- c2 = *from++ & 0x3f;
- c3 = *from++ & 0x3f;
- len -= 3;
- *to = c1 << 12;
- *to |= c2 << 6;
- *to |= c3;
- }
- else
- {
- *to = *from++;
- len--;
- }
- to++;
- }
- *to = 0;
- }
- static int
- pg_utf_mblen(const unsigned char *s)
- {
- int len = 1;
- if ((*s & 0x80) == 0)
- len = 1;
- else if ((*s & 0xe0) == 0xc0)
- len = 2;
- else if ((*s & 0xe0) == 0xe0)
- len = 3;
- return (len);
- }
- /*
- * convert mule internal code to pg_wchar
- * caller should allocate enough space for "to"
- * len: length of from.
- * "from" not necessarily null terminated.
- */
- static void
- pg_mule2wchar_with_len(const unsigned char *from, pg_wchar * to, int len)
- {
- while (*from && len > 0)
- {
- if (IS_LC1(*from))
- {
- *to = *from++ << 16;
- *to |= *from++;
- len -= 2;
- }
- else if (IS_LCPRV1(*from))
- {
- from++;
- *to = *from++ << 16;
- *to |= *from++;
- len -= 3;
- }
- else if (IS_LC2(*from))
- {
- *to = *from++ << 16;
- *to |= *from++ << 8;
- *to |= *from++;
- len -= 3;
- }
- else if (IS_LCPRV2(*from))
- {
- from++;
- *to = *from++ << 16;
- *to |= *from++ << 8;
- *to |= *from++;
- len -= 4;
- }
- else
- { /* assume ASCII */
- *to = (unsigned char) *from++;
- len--;
- }
- to++;
- }
- *to = 0;
- }
- int
- pg_mule_mblen(const unsigned char *s)
- {
- int len;
- if (IS_LC1(*s))
- len = 2;
- else if (IS_LCPRV1(*s))
- len = 3;
- else if (IS_LC2(*s))
- len = 3;
- else if (IS_LCPRV2(*s))
- len = 4;
- else
- { /* assume ASCII */
- len = 1;
- }
- return (len);
- }
- /*
- * ISO8859-1
- */
- static void
- pg_latin12wchar_with_len(const unsigned char *from, pg_wchar * to, int len)
- {
- while (*from && len-- > 0)
- *to++ = *from++;
- *to = 0;
- }
- static int
- pg_latin1_mblen(const unsigned char *s)
- {
- return (1);
- }
- /*
- * SJIS
- */
- static int
- pg_sjis_mblen(const unsigned char *s)
- {
- int len;
- if (*s >= 0xa1 && *s <= 0xdf)
- { /* 1 byte kana? */
- len = 1;
- }
- else if (*s > 0x7f)
- { /* kanji? */
- len = 2;
- }
- else
- { /* should be ASCII */
- len = 1;
- }
- return (len);
- }
- /*
- * Big5
- */
- static int
- pg_big5_mblen(const unsigned char *s)
- {
- int len;
- if (*s > 0x7f)
- { /* kanji? */
- len = 2;
- }
- else
- { /* should be ASCII */
- len = 1;
- }
- return (len);
- }
- pg_wchar_tbl pg_wchar_table[] = {
- {pg_ascii2wchar_with_len, pg_ascii_mblen}, /* 0 */
- {pg_eucjp2wchar_with_len, pg_eucjp_mblen}, /* 1 */
- {pg_euccn2wchar_with_len, pg_euccn_mblen}, /* 2 */
- {pg_euckr2wchar_with_len, pg_euckr_mblen}, /* 3 */
- {pg_euctw2wchar_with_len, pg_euctw_mblen}, /* 4 */
- {pg_utf2wchar_with_len, pg_utf_mblen}, /* 5 */
- {pg_mule2wchar_with_len, pg_mule_mblen}, /* 6 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 7 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 8 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 9 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 10 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 11 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 12 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 13 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 14 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 15 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 16 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 17 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 18 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 19 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 20 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 21 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 22 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 23 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 24 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 25 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 26 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 27 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 28 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 29 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 30 */
- {pg_latin12wchar_with_len, pg_latin1_mblen}, /* 31 */
- {0, pg_sjis_mblen}, /* 32 */
- {0, pg_big5_mblen}, /* 33 */
- {pg_latin12wchar_with_len, pg_latin1_mblen} /* 34 */
- };
- /* returns the byte length of a word for mule internal code */
- int
- pg_mic_mblen(const unsigned char *mbstr)
- {
- return (pg_mule_mblen(mbstr));
- }