1 files changed, 463 insertions, 0 deletions

diff --git a/src/common/utf8.cpp b/src/common/utf8.cpp
new file mode 100644
index 000000000..9aa8088ef
--- /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