diff options
Diffstat (limited to 'libwc/detect.c')
| -rw-r--r-- | libwc/detect.c | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/libwc/detect.c b/libwc/detect.c new file mode 100644 index 0000000..eea2d5d --- /dev/null +++ b/libwc/detect.c @@ -0,0 +1,544 @@ + +#include "wc.h" +#include "iso2022.h" +#include "sjis.h" +#include "big5.h" +#include "hz.h" +#include "viet.h" +#ifdef USE_UNICODE +#include "utf8.h" +#include "utf7.h" +#endif + +wc_uint8 WC_DETECT_MAP[ 0x100 ] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, +}; + +#define DETECT_NORMAL 0 +#define DETECT_POSSIBLE 1 +#define DETECT_OK 2 +#define DETECT_BROKEN 4 +#define DETECT_ERROR 8 +#define SET_DETECT(x,y) ((x) |= (y)) +#define SET_BROKEN_ERROR(x) ((x) = ((x) & DETECT_BROKEN) ? DETECT_ERROR : ((x) | DETECT_BROKEN)) + +void +wc_create_detect_map(wc_ces ces, wc_bool esc) +{ + static wc_ces detect_ces = WC_CES_US_ASCII; + int i; + + if (ces != detect_ces) { + if (ces & WC_CES_T_VIET) { + wc_uint8 *map = NULL; + switch (ces) { + case WC_CES_TCVN_5712: + map = wc_c0_tcvn57122_map; + break; + case WC_CES_VISCII_11: + map = wc_c0_viscii112_map; + break; + case WC_CES_VPS: + map = wc_c0_vps2_map; + break; + } + for (i = 0; i < 0x20; i++) + WC_DETECT_MAP[i] = map[i] ? 1 : 0; + } else { + for (i = 0; i < 0x20; i++) + WC_DETECT_MAP[i] = 0; + WC_DETECT_MAP[WC_C_HZ_TILDA] = (ces == WC_CES_HZ_GB_2312) ? 1 : 0; +#ifdef USE_UNICODE + WC_DETECT_MAP[WC_C_UTF7_PLUS] = (ces == WC_CES_UTF_7) ? 1 : 0; +#endif + } + detect_ces = ces; + } + WC_DETECT_MAP[WC_C_ESC] = (esc || (ces & WC_CES_T_ISO_2022)) ? 1 : 0; + return; +} + +wc_ces +wc_auto_detect(char *is, size_t len, wc_ces hint) +{ + wc_uchar *p = (wc_uchar *)is; + wc_uchar *ep = p + len; + wc_uchar *q; + wc_ces euc = 0, priv = 0; + wc_status st; + int euc_state = 0, sjis_state = 0, big5_state = 0, hz_state = 0; + int iso_detect = DETECT_ERROR, euc_detect = DETECT_ERROR, + sjis_detect = DETECT_ERROR, big5_detect = DETECT_ERROR, + hz_detect = DETECT_ERROR, latin_detect = DETECT_ERROR, + priv_detect = DETECT_ERROR; + int possible = 0; + wc_bool iso2022jp2 = WC_FALSE, iso2022jp3 = WC_FALSE, + iso2022cn = WC_FALSE, iso2022kr = WC_FALSE, ok = WC_FALSE; +#ifdef USE_UNICODE + int utf8_state = 0; + int utf8_detect = DETECT_ERROR; + int utf8_next = 0; +#endif + + wc_create_detect_map(hint, WC_TRUE); + for (; p < ep && ! WC_DETECT_MAP[*p]; p++) + ; + if (p == ep) + return WC_CES_US_ASCII; + + switch (hint) { + case WC_CES_ISO_2022_JP: + case WC_CES_ISO_2022_JP_2: + case WC_CES_ISO_2022_JP_3: + case WC_CES_EUC_JP: + case WC_CES_SHIFT_JIS: + case WC_CES_SHIFT_JISX0213: + euc = WC_CES_EUC_JP; + euc_state = WC_EUC_NOSTATE; + sjis_state = WC_SJIS_NOSTATE; + iso_detect = euc_detect = sjis_detect = DETECT_NORMAL; + possible = 3; + break; + case WC_CES_ISO_2022_CN: + case WC_CES_EUC_CN: + euc = WC_CES_EUC_CN; + euc_state = WC_EUC_NOSTATE; + big5_state = WC_BIG5_NOSTATE; + iso_detect = euc_detect = big5_detect = DETECT_NORMAL; + possible = 3; + break; + case WC_CES_EUC_TW: + case WC_CES_BIG5: + euc = WC_CES_EUC_TW; + euc_state = WC_EUC_NOSTATE; + big5_state = WC_BIG5_NOSTATE; + iso_detect = euc_detect = big5_detect = DETECT_NORMAL; + possible = 3; + break; + case WC_CES_HZ_GB_2312: + euc = WC_CES_EUC_CN; + euc_state = WC_EUC_NOSTATE; + hz_state = WC_HZ_NOSTATE; + iso_detect = euc_detect = big5_detect = hz_detect = DETECT_NORMAL; + possible = 4; + break; + case WC_CES_ISO_2022_KR: + case WC_CES_EUC_KR: + euc = WC_CES_EUC_KR; + euc_state = WC_EUC_NOSTATE; + iso_detect = euc_detect = DETECT_NORMAL; + possible = 3; + break; +#ifdef USE_UNICODE + case WC_CES_UTF_8: + iso_detect = DETECT_NORMAL; + possible = 1; + break; +#endif + case WC_CES_US_ASCII: + iso_detect = latin_detect = DETECT_NORMAL; + possible = 2; + break; + default: + if (hint & WC_CES_T_ISO_8859) { + iso_detect = latin_detect = DETECT_NORMAL; + possible = 2; + } else { + iso_detect = priv_detect = DETECT_NORMAL; + priv = hint; /* for TVCN, VISCII, VPS */ + possible = 2; + } + break; + } +#ifdef USE_UNICODE + if (priv_detect == DETECT_ERROR) { + utf8_detect = DETECT_NORMAL; + possible++; + } +#endif + + wc_input_init(WC_CES_US_ASCII, &st); + + for (; p < ep; p++) { + if (possible == 0 || (possible == 1 && ok)) + break; + if (iso_detect != DETECT_ERROR) { + switch (*p) { + case WC_C_ESC: + if (*(p+1) == WC_C_MBCS) { + q = p; + if (! wc_parse_iso2022_esc(&q, &st)) + break; + if (st.design[0] == WC_CCS_JIS_C_6226 || + st.design[0] == WC_CCS_JIS_X_0208) + ; + else if (st.design[0] == WC_CCS_JIS_X_0213_1 || + st.design[0] == WC_CCS_JIS_X_0213_2) + iso2022jp3 = WC_TRUE; + else if (WC_CCS_TYPE(st.design[0]) == WC_CCS_A_CS94W) + iso2022jp2 = WC_TRUE; + if (st.design[1] == WC_CCS_KS_X_1001) + iso2022kr = WC_TRUE; + else if (st.design[1] == WC_CCS_GB_2312 || + st.design[1] == WC_CCS_ISO_IR_165 || + st.design[1] == WC_CCS_CNS_11643_1) + iso2022cn = WC_TRUE; + if (WC_CCS_TYPE(st.design[2]) == WC_CCS_A_CS94W || + WC_CCS_TYPE(st.design[3]) == WC_CCS_A_CS94W) + iso2022cn = WC_TRUE; + } else if (*(p+1) == WC_C_G2_CS96) { + q = p; + if (! wc_parse_iso2022_esc(&q, &st)) + break; + if (WC_CCS_TYPE(st.design[2]) == WC_CCS_A_CS96) + iso2022jp2 = WC_TRUE; + } else if (*(p+1) == WC_C_CSWSR) { + q = p; + if (! wc_parse_iso2022_esc(&q, &st)) + break; + possible = 0; + iso_detect = DETECT_BROKEN; + continue; + } + iso_detect = DETECT_OK; + ok = WC_TRUE; + break; + case WC_C_SI: + case WC_C_SO: + iso_detect = DETECT_OK; + ok = WC_TRUE; + iso2022cn = WC_TRUE; + iso2022kr = WC_TRUE; + break; + default: + if (*p & 0x80) { + iso_detect = DETECT_ERROR; + possible--; + } + break; + } + } + if (euc_detect != DETECT_ERROR) { + switch (euc_state) { + case WC_EUC_NOSTATE: + switch (WC_ISO_MAP[*p]) { + case WC_ISO_MAP_GR: + euc_state = WC_EUC_MBYTE1; + break; + case WC_ISO_MAP_SS2: + if (euc == WC_CES_EUC_JP) + euc_state = WC_EUC_MBYTE1; + else if (euc == WC_CES_EUC_TW) + euc_state = WC_EUC_TW_SS2; + else + euc_detect = DETECT_ERROR; + break; + case WC_ISO_MAP_SS3: + if (euc == WC_CES_EUC_JP && + WC_ISO_MAP[*(p+1)] == WC_ISO_MAP_GR) + ; + else + euc_detect = DETECT_ERROR; + break; + case WC_ISO_MAP_C1: + case WC_ISO_MAP_GR96: + euc_detect = DETECT_ERROR; + break; + } + break; + case WC_EUC_MBYTE1: + if (WC_ISO_MAP[*p] == WC_ISO_MAP_GR) { + SET_DETECT(euc_detect, DETECT_OK); + ok = WC_TRUE; + } else + SET_BROKEN_ERROR(euc_detect); + euc_state = WC_EUC_NOSTATE; + break; + case WC_EUC_TW_SS2: + if (!( 0xa0 <= *p && *p <= 0xb0) || + WC_ISO_MAP[*(p+1)] != WC_ISO_MAP_GR) + euc_detect = DETECT_ERROR; + euc_state = WC_EUC_NOSTATE; + break; + } + if (euc_detect == DETECT_ERROR) + possible--; + } + if (sjis_detect != DETECT_ERROR) { + switch (sjis_state) { + case WC_SJIS_NOSTATE: + switch (WC_SJIS_MAP[*p]) { + case WC_SJIS_MAP_SL: + case WC_SJIS_MAP_SH: + sjis_state = WC_SJIS_SHIFT_L; + break; + case WC_SJIS_MAP_SK: + SET_DETECT(sjis_detect, DETECT_POSSIBLE); + break; + case WC_SJIS_MAP_SX: + if (WcOption.use_jisx0213) { + sjis_state = WC_SJIS_SHIFT_X; + break; + } + case WC_SJIS_MAP_80: + case WC_SJIS_MAP_A0: + case WC_SJIS_MAP_C1: + sjis_detect = DETECT_ERROR; + break; + } + break; + case WC_SJIS_SHIFT_L: + if (WC_SJIS_MAP[*p] & WC_SJIS_MAP_LB) { + SET_DETECT(sjis_detect, DETECT_OK); + ok = WC_TRUE; + } else + SET_BROKEN_ERROR(sjis_detect); + sjis_state = WC_SJIS_NOSTATE; + break; + case WC_SJIS_SHIFT_X: + if (WC_SJIS_MAP[*p] & WC_SJIS_MAP_LB) + SET_DETECT(sjis_detect, DETECT_POSSIBLE); + else + sjis_detect = DETECT_ERROR; + sjis_state = WC_SJIS_NOSTATE; + break; + } + if (sjis_detect == DETECT_ERROR) + possible--; + } + if (big5_detect != DETECT_ERROR) { + switch (big5_state) { + case WC_BIG5_NOSTATE: + switch (WC_BIG5_MAP[*p]) { + case WC_BIG5_MAP_UB: + big5_state = WC_BIG5_MBYTE1; + break; + case WC_BIG5_MAP_C1: + big5_detect = DETECT_ERROR; + break; + } + break; + case WC_BIG5_MBYTE1: + if (WC_BIG5_MAP[*p] & WC_BIG5_MAP_LB) { + SET_DETECT(big5_detect, DETECT_OK); + ok = WC_TRUE; + } else + SET_BROKEN_ERROR(big5_detect); + big5_state = WC_BIG5_NOSTATE; + break; + } + if (big5_detect == DETECT_ERROR) + possible--; + } + if (hz_detect != DETECT_ERROR) { + if (*p & 0x80) { + hz_detect = DETECT_ERROR; + possible--; + } else { + switch (hz_state) { + case WC_HZ_NOSTATE: + if (*p == WC_C_HZ_TILDA) + hz_state = WC_HZ_TILDA; + break; + case WC_HZ_TILDA: + if (*p == WC_C_HZ_SI) + hz_state = WC_HZ_MBYTE; + else + hz_state = WC_HZ_NOSTATE; + break; + case WC_HZ_TILDA_MB: + if (*p == WC_C_HZ_SO) + hz_state = WC_HZ_NOSTATE; + else + hz_state = WC_HZ_MBYTE; + break; + case WC_HZ_MBYTE: + if (*p == WC_C_HZ_TILDA) + hz_state = WC_HZ_TILDA_MB; + else + hz_state = WC_HZ_MBYTE1; + break; + case WC_HZ_MBYTE1: + hz_detect = DETECT_OK; + ok = WC_TRUE; + hz_state = WC_HZ_NOSTATE; + break; + } + } + } + if (latin_detect != DETECT_ERROR) { + switch (WC_ISO_MAP[*p] & WC_ISO_MAP_CG) { + case WC_ISO_MAP_GR: + case WC_ISO_MAP_GR96: + SET_DETECT(latin_detect, DETECT_OK); + ok = WC_TRUE; + break; + case WC_ISO_MAP_C1: + latin_detect = DETECT_ERROR; + break; + } + if (latin_detect == DETECT_ERROR) + possible--; + } + if (priv_detect != DETECT_ERROR) { + if (*p != WC_C_ESC && WC_DETECT_MAP[*p]) { + SET_DETECT(priv_detect, DETECT_OK); + ok = WC_TRUE; + } +/* + if (priv_detect == DETECT_ERROR) + possible--; +*/ + } +#ifdef USE_UNICODE + if (utf8_detect != DETECT_ERROR) { + switch (utf8_state) { + case WC_UTF8_NOSTATE: + switch (utf8_next = WC_UTF8_MAP[*p]) { + case 1: + case 8: + break; + case 0: + case 7: + utf8_detect = DETECT_ERROR; + break; + default: + utf8_next--; + utf8_state = WC_UTF8_NEXT; + break; + } + break; + case WC_UTF8_NEXT: + if (WC_UTF8_MAP[*p]) { + utf8_detect = DETECT_ERROR; + utf8_state = WC_UTF8_NOSTATE; + break; + } + utf8_next--; + if (! utf8_next) { + SET_DETECT(utf8_detect, DETECT_OK); + ok = WC_TRUE; + utf8_state = WC_UTF8_NOSTATE; + } + break; + } + if (utf8_detect == DETECT_ERROR) + possible--; + } +#endif + } + + if (iso_detect != DETECT_ERROR) { + if (iso_detect == DETECT_NORMAL) { + if (hz_detect == DETECT_OK) + return WC_CES_HZ_GB_2312; + if (priv_detect == DETECT_OK) + return priv; + return WC_CES_US_ASCII; + } + switch (euc) { + case WC_CES_EUC_CN: + case WC_CES_EUC_TW: + if (iso2022cn) + return WC_CES_ISO_2022_CN; + break; + case WC_CES_EUC_KR: + if (iso2022kr) + return WC_CES_ISO_2022_KR; + break; + } + if (iso2022jp3) + return WC_CES_ISO_2022_JP_3; + if (iso2022jp2) + return WC_CES_ISO_2022_JP_2; + if (iso2022cn) + return WC_CES_ISO_2022_CN; + if (iso2022kr) + return WC_CES_ISO_2022_KR; + return WC_CES_ISO_2022_JP; + } + switch (hint) { + case WC_CES_ISO_2022_JP: + case WC_CES_ISO_2022_JP_2: + case WC_CES_ISO_2022_JP_3: + case WC_CES_ISO_2022_KR: + case WC_CES_ISO_2022_CN: + break; + case WC_CES_EUC_JP: + case WC_CES_EUC_CN: + case WC_CES_EUC_TW: + case WC_CES_EUC_KR: + if (euc_detect != DETECT_ERROR) + return hint; + break; + case WC_CES_SHIFT_JIS: + case WC_CES_SHIFT_JISX0213: + if (sjis_detect != DETECT_ERROR) + return hint; + break; + case WC_CES_BIG5: + if (big5_detect != DETECT_ERROR) + return hint; + break; +#ifdef USE_UNICODE + case WC_CES_UTF_8: + return hint; +#endif + case WC_CES_US_ASCII: +#ifdef USE_UNICODE + if (utf8_detect != DETECT_ERROR) + return hint; +#endif + if (latin_detect != DETECT_ERROR) + return WC_CES_ISO_8859_1; + return hint; + default: + if (latin_detect != DETECT_ERROR) + return hint; + if (priv_detect != DETECT_ERROR) + return hint; +#ifdef USE_UNICODE + if (utf8_detect != DETECT_ERROR) + return WC_CES_UTF_8; +#endif + return hint; + } + if (euc_detect == DETECT_OK) + return euc; + if (sjis_detect == DETECT_OK) + return WC_CES_SHIFT_JIS; + if (big5_detect == DETECT_OK) + return WC_CES_BIG5; +#ifdef USE_UNICODE + if (utf8_detect == DETECT_OK) + return WC_CES_UTF_8; + if (sjis_detect & DETECT_POSSIBLE) + return WC_CES_SHIFT_JIS; +#endif + if (euc_detect != DETECT_ERROR) + return euc; + if (sjis_detect != DETECT_ERROR) + return WC_CES_SHIFT_JIS; + if (big5_detect != DETECT_ERROR) + return WC_CES_BIG5; +#ifdef USE_UNICODE + if (utf8_detect != DETECT_ERROR) + return WC_CES_UTF_8; +#endif + return hint; +} |