aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/common/utf8.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/common/utf8.cpp')
-rw-r--r--src/common/utf8.cpp463
1 files changed, 463 insertions, 0 deletions
diff --git a/src/common/utf8.cpp b/src/common/utf8.cpp
new file mode 100644
index 00000000..9aa8088e
--- /dev/null
+++ b/src/common/utf8.cpp
@@ -0,0 +1,463 @@
+/*
+ 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.
+*/
+
+#ifdef _WIN32
+#include <windows.h>
+#undef min
+#undef max
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include <algorithm>
+#include <string>
+
+#include "common_types.h"
+#include "utf8.h"
+
+// is start of UTF sequence
+inline bool isutf(char c) {
+ return (c & 0xC0) != 0x80;
+}
+
+static const u32 offsetsFromUTF8[6] = {
+ 0x00000000UL, 0x00003080UL, 0x000E2080UL,
+ 0x03C82080UL, 0xFA082080UL, 0x82082080UL
+};
+
+static const u8 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(const 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(u32 *dest, int sz, const char *src, int srcsz)
+{
+ u32 ch;
+ const 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, u32 *src, int srcsz)
+{
+ u32 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, u32 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(const 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(const 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(const 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 */
+u32 u8_nextchar(const char *s, int *i)
+{
+ u32 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(const char *s, int *i)
+{
+ (void)(isutf(s[++(*i)]) || isutf(s[++(*i)]) ||
+ isutf(s[++(*i)]) || ++(*i));
+}
+
+void u8_dec(const 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(const char *str, u32 *dest)
+{
+ u32 ch;
+ char digs[9]="\0\0\0\0\0\0\0\0";
+ int dno=0, i=1;
+
+ ch = (u32)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;
+ u32 ch;
+ char temp[4];
+
+ while (*src && c < sz) {
+ if (*src == '\\') {
+ src++;
+ amt = u8_read_escape_sequence(src, &ch);
+ }
+ else {
+ ch = (u32)*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;
+}
+
+const char *u8_strchr(const char *s, u32 ch, int *charn)
+{
+ int i = 0, lasti=0;
+ u32 c;
+
+ *charn = 0;
+ while (s[i]) {
+ c = u8_nextchar(s, &i);
+ if (c == ch) {
+ return &s[lasti];
+ }
+ lasti = i;
+ (*charn)++;
+ }
+ return NULL;
+}
+
+const char *u8_memchr(const char *s, u32 ch, size_t sz, int *charn)
+{
+ u32 i = 0, lasti=0;
+ u32 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(const 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 UTF8StringNonASCIICount(const char *utf8string) {
+ UTF8 utf(utf8string);
+ int count = 0;
+ while (!utf.end()) {
+ int c = utf.next();
+ if (c > 127)
+ ++count;
+ }
+ return count;
+}
+
+bool UTF8StringHasNonASCII(const char *utf8string) {
+ return UTF8StringNonASCIICount(utf8string) > 0;
+}
+
+#ifdef _WIN32
+
+std::string ConvertWStringToUTF8(const wchar_t *wstr) {
+ int len = (int)wcslen(wstr);
+ int size = (int)WideCharToMultiByte(CP_UTF8, 0, wstr, len, 0, 0, NULL, NULL);
+ std::string s;
+ s.resize(size);
+ if (size > 0) {
+ WideCharToMultiByte(CP_UTF8, 0, wstr, len, &s[0], size, NULL, NULL);
+ }
+ return s;
+}
+
+std::string ConvertWStringToUTF8(const std::wstring &wstr) {
+ int len = (int)wstr.size();
+ int size = (int)WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), len, 0, 0, NULL, NULL);
+ std::string s;
+ s.resize(size);
+ if (size > 0) {
+ WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), len, &s[0], size, NULL, NULL);
+ }
+ return s;
+}
+
+void ConvertUTF8ToWString(wchar_t *dest, size_t destSize, const std::string &source) {
+ int len = (int)source.size();
+ int size = (int)MultiByteToWideChar(CP_UTF8, 0, source.c_str(), len, NULL, 0);
+ MultiByteToWideChar(CP_UTF8, 0, source.c_str(), len, dest, std::min((int)destSize, size));
+}
+
+std::wstring ConvertUTF8ToWString(const std::string &source) {
+ int len = (int)source.size();
+ int size = (int)MultiByteToWideChar(CP_UTF8, 0, source.c_str(), len, NULL, 0);
+ std::wstring str;
+ str.resize(size);
+ if (size > 0) {
+ MultiByteToWideChar(CP_UTF8, 0, source.c_str(), len, &str[0], size);
+ }
+ return str;
+}
+
+#endif \ No newline at end of file
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-30 06:20:42 +0000