diff options
Diffstat (limited to 'engines/sludge/CommonCode/utf8.cpp')
-rw-r--r-- | engines/sludge/CommonCode/utf8.cpp | 541 |
1 files changed, 541 insertions, 0 deletions
diff --git a/engines/sludge/CommonCode/utf8.cpp b/engines/sludge/CommonCode/utf8.cpp new file mode 100644 index 0000000000..24d9010764 --- /dev/null +++ b/engines/sludge/CommonCode/utf8.cpp @@ -0,0 +1,541 @@ +/* + Basic UTF-8 manipulation routines + by Jeff Bezanson + placed in the public domain Fall 2005 + + This code is designed to provide the utilities you need to manipulate + UTF-8 as an internal string encoding. These functions do not perform the + error checking normally needed when handling UTF-8 data, so if you happen + to be from the Unicode Consortium you will want to flay me alive. + I do this because error checking can be performed at the boundaries (I/O), + with these routines reserved for higher performance on data known to be + valid. +*/ +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <stdarg.h> +#ifdef WIN32 +#include <malloc.h> +#else +#include <alloca.h> +#endif + +#include "utf8.h" + +static const uint32_t offsetsFromUTF8[6] = { + 0x00000000UL, 0x00003080UL, 0x000E2080UL, + 0x03C82080UL, 0xFA082080UL, 0x82082080UL +}; + +static const char trailingBytesForUTF8[256] = { + 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, + 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, + 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 +}; + +/* returns length of next utf-8 sequence */ +int u8_seqlen(char *s) +{ + return trailingBytesForUTF8[(unsigned int)(unsigned char)s[0]] + 1; +} + +/* conversions without error checking + only works for valid UTF-8, i.e. no 5- or 6-byte sequences + srcsz = source size in bytes, or -1 if 0-terminated + sz = dest size in # of wide characters + + returns # characters converted + dest will always be L'\0'-terminated, even if there isn't enough room + for all the characters. + if sz = srcsz+1 (i.e. 4*srcsz+4 bytes), there will always be enough space. +*/ +int u8_toucs(uint32_t *dest, int sz, char *src, int srcsz) +{ + uint32_t ch; + char *src_end = src + srcsz; + int nb; + int i=0; + + while (i < sz-1) { + nb = trailingBytesForUTF8[(unsigned char)*src]; + if (srcsz == -1) { + if (*src == 0) + goto done_toucs; + } + else { + if (src + nb >= src_end) + goto done_toucs; + } + ch = 0; + switch (nb) { + /* these fall through deliberately */ + case 3: ch += (unsigned char)*src++; ch <<= 6; + case 2: ch += (unsigned char)*src++; ch <<= 6; + case 1: ch += (unsigned char)*src++; ch <<= 6; + case 0: ch += (unsigned char)*src++; + } + ch -= offsetsFromUTF8[nb]; + dest[i++] = ch; + } + done_toucs: + dest[i] = 0; + return i; +} + +/* srcsz = number of source characters, or -1 if 0-terminated + sz = size of dest buffer in bytes + + returns # characters converted + dest will only be '\0'-terminated if there is enough space. this is + for consistency; imagine there are 2 bytes of space left, but the next + character requires 3 bytes. in this case we could NUL-terminate, but in + general we can't when there's insufficient space. therefore this function + only NUL-terminates if all the characters fit, and there's space for + the NUL as well. + the destination string will never be bigger than the source string. +*/ +int u8_toutf8(char *dest, int sz, uint32_t *src, int srcsz) +{ + uint32_t ch; + int i = 0; + char *dest_end = dest + sz; + + while (srcsz<0 ? src[i]!=0 : i < srcsz) { + ch = src[i]; + if (ch < 0x80) { + if (dest >= dest_end) + return i; + *dest++ = (char)ch; + } + else if (ch < 0x800) { + if (dest >= dest_end-1) + return i; + *dest++ = (ch>>6) | 0xC0; + *dest++ = (ch & 0x3F) | 0x80; + } + else if (ch < 0x10000) { + if (dest >= dest_end-2) + return i; + *dest++ = (ch>>12) | 0xE0; + *dest++ = ((ch>>6) & 0x3F) | 0x80; + *dest++ = (ch & 0x3F) | 0x80; + } + else if (ch < 0x110000) { + if (dest >= dest_end-3) + return i; + *dest++ = (ch>>18) | 0xF0; + *dest++ = ((ch>>12) & 0x3F) | 0x80; + *dest++ = ((ch>>6) & 0x3F) | 0x80; + *dest++ = (ch & 0x3F) | 0x80; + } + i++; + } + if (dest < dest_end) + *dest = '\0'; + return i; +} + +int u8_wc_toutf8(char *dest, uint32_t ch) +{ + if (ch < 0x80) { + dest[0] = (char)ch; + return 1; + } + if (ch < 0x800) { + dest[0] = (ch>>6) | 0xC0; + dest[1] = (ch & 0x3F) | 0x80; + return 2; + } + if (ch < 0x10000) { + dest[0] = (ch>>12) | 0xE0; + dest[1] = ((ch>>6) & 0x3F) | 0x80; + dest[2] = (ch & 0x3F) | 0x80; + return 3; + } + if (ch < 0x110000) { + dest[0] = (ch>>18) | 0xF0; + dest[1] = ((ch>>12) & 0x3F) | 0x80; + dest[2] = ((ch>>6) & 0x3F) | 0x80; + dest[3] = (ch & 0x3F) | 0x80; + return 4; + } + return 0; +} + +/* charnum => byte offset */ +int u8_offset(char *str, int charnum) +{ + int offs=0; + + while (charnum > 0 && str[offs]) { + (void)(isutf(str[++offs]) || isutf(str[++offs]) || + isutf(str[++offs]) || ++offs); + charnum--; + } + return offs; +} + +/* byte offset => charnum */ +int u8_charnum(char *s, int offset) +{ + int charnum = 0, offs=0; + + while (offs < offset && s[offs]) { + (void)(isutf(s[++offs]) || isutf(s[++offs]) || + isutf(s[++offs]) || ++offs); + charnum++; + } + return charnum; +} + +/* number of characters */ +int u8_strlen(char *s) +{ + int count = 0; + int i = 0; + + while (u8_nextchar(s, &i) != 0) + count++; + + return count; +} + +/* reads the next utf-8 sequence out of a string, updating an index */ +uint32_t u8_nextchar(const char *s, int *i) +{ + uint32_t ch = 0; + int sz = 0; + + do { + ch <<= 6; + ch += (unsigned char)s[(*i)++]; + sz++; + } while (s[*i] && !isutf(s[*i])); + ch -= offsetsFromUTF8[sz-1]; + + return ch; +} + +void u8_inc(char *s, int *i) +{ + (void)(isutf(s[++(*i)]) || isutf(s[++(*i)]) || + isutf(s[++(*i)]) || ++(*i)); +} + +void u8_dec(char *s, int *i) +{ + (void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) || + isutf(s[--(*i)]) || --(*i)); +} + +int octal_digit(char c) +{ + return (c >= '0' && c <= '7'); +} + +int hex_digit(char c) +{ + return ((c >= '0' && c <= '9') || + (c >= 'A' && c <= 'F') || + (c >= 'a' && c <= 'f')); +} + +/* assumes that src points to the character after a backslash + returns number of input characters processed */ +int u8_read_escape_sequence(char *str, uint32_t *dest) +{ + uint32_t ch; + char digs[9]="\0\0\0\0\0\0\0\0"; + int dno=0, i=1; + + ch = (uint32_t)str[0]; /* take literal character */ + if (str[0] == 'n') + ch = L'\n'; + else if (str[0] == 't') + ch = L'\t'; + else if (str[0] == 'r') + ch = L'\r'; + else if (str[0] == 'b') + ch = L'\b'; + else if (str[0] == 'f') + ch = L'\f'; + else if (str[0] == 'v') + ch = L'\v'; + else if (str[0] == 'a') + ch = L'\a'; + else if (octal_digit(str[0])) { + i = 0; + do { + digs[dno++] = str[i++]; + } while (octal_digit(str[i]) && dno < 3); + ch = strtol(digs, NULL, 8); + } + else if (str[0] == 'x') { + while (hex_digit(str[i]) && dno < 2) { + digs[dno++] = str[i++]; + } + if (dno > 0) + ch = strtol(digs, NULL, 16); + } + else if (str[0] == 'u') { + while (hex_digit(str[i]) && dno < 4) { + digs[dno++] = str[i++]; + } + if (dno > 0) + ch = strtol(digs, NULL, 16); + } + else if (str[0] == 'U') { + while (hex_digit(str[i]) && dno < 8) { + digs[dno++] = str[i++]; + } + if (dno > 0) + ch = strtol(digs, NULL, 16); + } + *dest = ch; + + return i; +} + +/* convert a string with literal \uxxxx or \Uxxxxxxxx characters to UTF-8 + example: u8_unescape(mybuf, 256, "hello\\u220e") + note the double backslash is needed if called on a C string literal */ +int u8_unescape(char *buf, int sz, char *src) +{ + int c=0, amt; + uint32_t ch; + char temp[4]; + + while (*src && c < sz) { + if (*src == '\\') { + src++; + amt = u8_read_escape_sequence(src, &ch); + } + else { + ch = (uint32_t)*src; + amt = 1; + } + src += amt; + amt = u8_wc_toutf8(temp, ch); + if (amt > sz-c) + break; + memcpy(&buf[c], temp, amt); + c += amt; + } + if (c < sz) + buf[c] = '\0'; + return c; +} + +int u8_escape_wchar(char *buf, int sz, uint32_t ch) +{ + if (ch == L'\n') + return snprintf(buf, sz, "\\n"); + else if (ch == L'\t') + return snprintf(buf, sz, "\\t"); + else if (ch == L'\r') + return snprintf(buf, sz, "\\r"); + else if (ch == L'\b') + return snprintf(buf, sz, "\\b"); + else if (ch == L'\f') + return snprintf(buf, sz, "\\f"); + else if (ch == L'\v') + return snprintf(buf, sz, "\\v"); + else if (ch == L'\a') + return snprintf(buf, sz, "\\a"); + else if (ch == L'\\') + return snprintf(buf, sz, "\\\\"); + else if (ch < 32 || ch == 0x7f) + return snprintf(buf, sz, "\\x%hhX", (unsigned char)ch); + else if (ch > 0xFFFF) + return snprintf(buf, sz, "\\U%.8X", (uint32_t)ch); + else if (ch >= 0x80 && ch <= 0xFFFF) + return snprintf(buf, sz, "\\u%.4hX", (unsigned short)ch); + + return snprintf(buf, sz, "%c", (char)ch); +} + +int u8_escape(char *buf, int sz, char *src, int escape_quotes) +{ + int c=0, i=0, amt; + + while (src[i] && c < sz) { + if (escape_quotes && src[i] == '"') { + amt = snprintf(buf, sz - c, "\\\""); + i++; + } + else { + amt = u8_escape_wchar(buf, sz - c, u8_nextchar(src, &i)); + } + c += amt; + buf += amt; + } + if (c < sz) + *buf = '\0'; + return c; +} + +char *u8_strchr(char *s, uint32_t ch, int *charn) +{ + int i = 0, lasti=0; + uint32_t c; + + *charn = 0; + while (s[i]) { + c = u8_nextchar(s, &i); + if (c == ch) { + return &s[lasti]; + } + lasti = i; + (*charn)++; + } + return NULL; +} + +char *u8_memchr(char *s, uint32_t ch, size_t sz, int *charn) +{ + int i = 0, lasti=0; + uint32_t c; + int csz; + + *charn = 0; + while (i < sz) { + c = csz = 0; + do { + c <<= 6; + c += (unsigned char)s[i++]; + csz++; + } while (i < sz && !isutf(s[i])); + c -= offsetsFromUTF8[csz-1]; + + if (c == ch) { + return &s[lasti]; + } + lasti = i; + (*charn)++; + } + return NULL; +} + +int u8_is_locale_utf8(char *locale) +{ + /* this code based on libutf8 */ + const char* cp = locale; + + for (; *cp != '\0' && *cp != '@' && *cp != '+' && *cp != ','; cp++) { + if (*cp == '.') { + const char* encoding = ++cp; + for (; *cp != '\0' && *cp != '@' && *cp != '+' && *cp != ','; cp++) + ; + if ((cp-encoding == 5 && !strncmp(encoding, "UTF-8", 5)) + || (cp-encoding == 4 && !strncmp(encoding, "utf8", 4))) + return 1; /* it's UTF-8 */ + break; + } + } + return 0; +} + +int u8_vprintf(char *fmt, va_list ap) +{ + int cnt, sz=0; + char *buf; + uint32_t *wcs; + + sz = 512; + buf = (char*)alloca(sz); + try_print: + cnt = vsnprintf(buf, sz, fmt, ap); + if (cnt >= sz) { + buf = (char*)alloca(cnt - sz + 1); + sz = cnt + 1; + goto try_print; + } + wcs = (uint32_t*)alloca((cnt+1) * sizeof(uint32_t)); + cnt = u8_toucs(wcs, cnt+1, buf, cnt); + printf("%ls", (wchar_t*)wcs); + return cnt; +} + +int u8_printf(char *fmt, ...) +{ + int cnt; + va_list args; + + va_start(args, fmt); + + cnt = u8_vprintf(fmt, args); + + va_end(args); + return cnt; +} + + +// This function checks a string to see if it's valid UTF-8 +// It returns true if the string is valid. +// +// based on the valid_utf8 routine from the PCRE library by Philip Hazel + +int u8_isvalid(const char *str) +{ + const unsigned char *p; + unsigned char c; + int ab; + + for (p = (unsigned char*)str; *p; p++) { + c = *p; + if (c < 128) + continue; + if ((c & 0xc0) != 0xc0) + return 0; + ab = trailingBytesForUTF8[c]; + + p++; + /* Check top bits in the second byte */ + if ((*p & 0xc0) != 0x80) + return 0; + + /* Check for overlong sequences for each different length */ + switch (ab) { + /* Check for xx00 000x */ + case 1: + if ((c & 0x3e) == 0) return 0; + continue; /* We know there aren't any more bytes to check */ + + /* Check for 1110 0000, xx0x xxxx */ + case 2: + if (c == 0xe0 && (*p & 0x20) == 0) return 0; + break; + + /* Check for 1111 0000, xx00 xxxx */ + case 3: + if (c == 0xf0 && (*p & 0x30) == 0) return 0; + break; + + /* Check for 1111 1000, xx00 0xxx */ + case 4: + if (c == 0xf8 && (*p & 0x38) == 0) return 0; + break; + + /* Check for leading 0xfe or 0xff, + and then for 1111 1100, xx00 00xx */ + case 5: + if (c == 0xfe || c == 0xff || + (c == 0xfc && (*p & 0x3c) == 0)) return 0; + break; + } + + /* Check for valid bytes after the 2nd, if any; all must start 10 */ + while (--ab > 0) { + if ((*(++p) & 0xc0) != 0x80) return 0; + } + } + + return 1; +} + |