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 /*

  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "utilities/utf8.hpp"

 // Assume the utf8 string is in legal form and has been

 // checked in the class file parser/format checker.

 char* UTF8::next(const char* str, jchar* value) {

   unsigned const char *ptr = (const unsigned char *)str;

   unsigned char ch, ch2, ch3;

   int length = -1;              /* bad length */

   jchar result;

   switch ((ch = ptr[0]) >> 4) {

     default:

     result = ch;

     length = 1;

     break;

   case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:

     /* Shouldn't happen. */

     break;

   case 0xC: case 0xD:

     /* 110xxxxx  10xxxxxx */

     if (((ch2 = ptr[1]) & 0xC0) == 0x80) {

       unsigned char high_five = ch & 0x1F;

       unsigned char low_six = ch2 & 0x3F;

       result = (high_five << 6) + low_six;

       length = 2;

       break;

     }

     break;

   case 0xE:

     /* 1110xxxx 10xxxxxx 10xxxxxx */

     if (((ch2 = ptr[1]) & 0xC0) == 0x80) {

       if (((ch3 = ptr[2]) & 0xC0) == 0x80) {

         unsigned char high_four = ch & 0x0f;

         unsigned char mid_six = ch2 & 0x3f;

         unsigned char low_six = ch3 & 0x3f;

         result = (((high_four << 6) + mid_six) << 6) + low_six;

         length = 3;

       }

     }

     break;

   } /* end of switch */

   if (length <= 0) {

     *value = ptr[0];    /* default bad result; */

     return (char*)(ptr + 1); // make progress somehow

   }

   *value = result;

   // The assert is correct but the .class file is wrong

   // assert(UNICODE::utf8_size(result) == length, "checking reverse computation");

   return (char *)(ptr + length);

 }

 char* UTF8::next_character(const char* str, jint* value) {

   unsigned const char *ptr = (const unsigned char *)str;

   /* See if it's legal supplementary character:

      11101101 1010xxxx 10xxxxxx 11101101 1011xxxx 10xxxxxx */

   if (is_supplementary_character(ptr)) {

     *value = get_supplementary_character(ptr);

     return (char *)(ptr + 6);

   }

   jchar result;

   char* next_ch = next(str, &result);

   *value = result;

   return next_ch;

 }

 // Count bytes of the form 10xxxxxx and deduct this count

 // from the total byte count.  The utf8 string must be in

 // legal form which has been verified in the format checker.

 int UTF8::unicode_length(const char* str, int len) {

   int num_chars = len;

   for (int i = 0; i < len; i++) {

     if ((str[i] & 0xC0) == 0x80) {

       --num_chars;

     }

   }

   return num_chars;

 }

 // Count bytes of the utf8 string except those in form

 // 10xxxxxx which only appear in multibyte characters.

 // The utf8 string must be in legal form and has been

 // verified in the format checker.

 int UTF8::unicode_length(const char* str) {

   int num_chars = 0;

   for (const char* p = str; *p; p++) {

     if (((*p) & 0xC0) != 0x80) {

       num_chars++;

     }

   }

   return num_chars;

 }

 // Writes a jchar a utf8 and returns the end

 static u_char* utf8_write(u_char* base, jchar ch) {

   if ((ch != 0) && (ch <=0x7f)) {

     base[0] = (u_char) ch;

     return base + 1;

   }

   if (ch <= 0x7FF) {

     /* 11 bits or less. */

     unsigned char high_five = ch >> 6;

     unsigned char low_six = ch & 0x3F;

     base[0] = high_five | 0xC0; /* 110xxxxx */

     base[1] = low_six | 0x80;   /* 10xxxxxx */

     return base + 2;

   }

   /* possibly full 16 bits. */

   char high_four = ch >> 12;

   char mid_six = (ch >> 6) & 0x3F;

   char low_six = ch & 0x3f;

   base[0] = high_four | 0xE0; /* 1110xxxx */

   base[1] = mid_six | 0x80;   /* 10xxxxxx */

   base[2] = low_six | 0x80;   /* 10xxxxxx */

   return base + 3;

 }

 void UTF8::convert_to_unicode(const char* utf8_str, jchar* unicode_str, int unicode_length) {

   unsigned char ch;

   const char *ptr = utf8_str;

   int index = 0;

   /* ASCII case loop optimization */

   for (; index < unicode_length; index++) {

     if((ch = ptr[0]) > 0x7F) { break; }

     unicode_str[index] = ch;

     ptr = (const char *)(ptr + 1);

   }

   for (; index < unicode_length; index++) {

     ptr = UTF8::next(ptr, &unicode_str[index]);

   }

 }

 // returns the quoted ascii length of a 0-terminated utf8 string

 int UTF8::quoted_ascii_length(const char* utf8_str, int utf8_length) {

   const char *ptr = utf8_str;

   const char* end = ptr + utf8_length;

   int result = 0;

   while (ptr < end) {

     jchar c;

     ptr = UTF8::next(ptr, &c);

     if (c >= 32 && c < 127) {

       result++;

     } else {

       result += 6;

     }

   }

   return result;

 }

 // converts a utf8 string to quoted ascii

 void UTF8::as_quoted_ascii(const char* utf8_str, char* buf, int buflen) {

   const char *ptr = utf8_str;

   char* p = buf;

   char* end = buf + buflen;

   while (*ptr != '\0') {

     jchar c;

     ptr = UTF8::next(ptr, &c);

     if (c >= 32 && c < 127) {

       if (p + 1 >= end) break;      // string is truncated

       *p++ = (char)c;

     } else {

       if (p + 6 >= end) break;      // string is truncated

       sprintf(p, "\\u%04x", c);

       p += 6;

     }

   }

   *p = '\0';

 }

 const char* UTF8::from_quoted_ascii(const char* quoted_ascii_str) {

   const char *ptr = quoted_ascii_str;

   char* result = NULL;

   while (*ptr != '\0') {

     char c = *ptr;

     if (c < 32 || c >= 127) break;

   }

   if (*ptr == '\0') {

     // nothing to do so return original string

     return quoted_ascii_str;

   }

   // everything up to this point was ok.

   int length = ptr - quoted_ascii_str;

   char* buffer = NULL;

   for (int round = 0; round < 2; round++) {

     while (*ptr != '\0') {

       if (*ptr != '\\') {

         if (buffer != NULL) {

           buffer[length] = *ptr;

         }

         length++;

       } else {

         switch (ptr[1]) {

           case 'u': {

             ptr += 2;

             jchar value=0;

             for (int i=0; i<4; i++) {

               char c = *ptr++;

               switch (c) {

                 case '0': case '1': case '2': case '3': case '4':

                 case '5': case '6': case '7': case '8': case '9':

                   value = (value << 4) + c - '0';

                   break;

                 case 'a': case 'b': case 'c':

                 case 'd': case 'e': case 'f':

                   value = (value << 4) + 10 + c - 'a';

                   break;

                 case 'A': case 'B': case 'C':

                 case 'D': case 'E': case 'F':

                   value = (value << 4) + 10 + c - 'A';

                   break;

                 default:

                   ShouldNotReachHere();

               }

             }

             if (buffer == NULL) {

               char utf8_buffer[4];

               char* next = (char*)utf8_write((u_char*)utf8_buffer, value);

               length += next - utf8_buffer;

             } else {

               char* next = (char*)utf8_write((u_char*)&buffer[length], value);

               length += next - &buffer[length];

             }

             break;

           }

           case 't': if (buffer != NULL) buffer[length] = '\t'; ptr += 2; length++; break;

           case 'n': if (buffer != NULL) buffer[length] = '\n'; ptr += 2; length++; break;

           case 'r': if (buffer != NULL) buffer[length] = '\r'; ptr += 2; length++; break;

           case 'f': if (buffer != NULL) buffer[length] = '\f'; ptr += 2; length++; break;

           default:

             ShouldNotReachHere();

         }

       }

     }

     if (round == 0) {

       buffer = NEW_RESOURCE_ARRAY(char, length + 1);

       ptr = quoted_ascii_str;

     } else {

       buffer[length] = '\0';

     }

   }

   return buffer;

 }

 // Returns NULL if 'c' it not found. This only works as long

 // as 'c' is an ASCII character

 const jbyte* UTF8::strrchr(const jbyte* base, int length, jbyte c) {

   assert(length >= 0, "sanity check");

   assert(c >= 0, "does not work for non-ASCII characters");

   // Skip backwards in string until 'c' is found or end is reached

   while(--length >= 0 && base[length] != c);

   return (length < 0) ? NULL : &base[length];

 }

 bool UTF8::equal(const jbyte* base1, int length1, const jbyte* base2, int length2) {

   // Length must be the same

   if (length1 != length2) return false;

   for (int i = 0; i < length1; i++) {

     if (base1[i] != base2[i]) return false;

   }

   return true;

 }

 bool UTF8::is_supplementary_character(const unsigned char* str) {

   return ((str[0] & 0xFF) == 0xED) && ((str[1] & 0xF0) == 0xA0) && ((str[2] & 0xC0) == 0x80)

       && ((str[3] & 0xFF) == 0xED) && ((str[4] & 0xF0) == 0xB0) && ((str[5] & 0xC0) == 0x80);

 }

 jint UTF8::get_supplementary_character(const unsigned char* str) {

   return 0x10000 + ((str[1] & 0x0f) << 16) + ((str[2] & 0x3f) << 10)

                  + ((str[4] & 0x0f) << 6)  + (str[5] & 0x3f);

 }

 //-------------------------------------------------------------------------------------

 int UNICODE::utf8_size(jchar c) {

   if ((0x0001 <= c) && (c <= 0x007F)) return 1;

   if (c <= 0x07FF) return 2;

   return 3;

 }

 int UNICODE::utf8_length(jchar* base, int length) {

   int result = 0;

   for (int index = 0; index < length; index++) {

     jchar c = base[index];

     if ((0x0001 <= c) && (c <= 0x007F)) result += 1;

     else if (c <= 0x07FF) result += 2;

     else result += 3;

   }

   return result;

 }

 char* UNICODE::as_utf8(jchar* base, int length) {

   int utf8_len = utf8_length(base, length);

   u_char* result = NEW_RESOURCE_ARRAY(u_char, utf8_len + 1);

   u_char* p = result;

   for (int index = 0; index < length; index++) {

     p = utf8_write(p, base[index]);

   }

   *p = '\0';

   assert(p == &result[utf8_len], "length prediction must be correct");

   return (char*) result;

 }

 char* UNICODE::as_utf8(jchar* base, int length, char* buf, int buflen) {

   u_char* p = (u_char*)buf;

   u_char* end = (u_char*)buf + buflen;

   for (int index = 0; index < length; index++) {

     jchar c = base[index];

     if (p + utf8_size(c) >= end) break;      // string is truncated

     p = utf8_write(p, base[index]);

   }

   *p = '\0';

   return buf;

 }

 void UNICODE::convert_to_utf8(const jchar* base, int length, char* utf8_buffer) {

   for(int index = 0; index < length; index++) {

     utf8_buffer = (char*)utf8_write((u_char*)utf8_buffer, base[index]);

   }

   *utf8_buffer = '\0';

 }

 // returns the quoted ascii length of a unicode string

 int UNICODE::quoted_ascii_length(jchar* base, int length) {

   int result = 0;

   for (int i = 0; i < length; i++) {

     jchar c = base[i];

     if (c >= 32 && c < 127) {

       result++;

     } else {

       result += 6;

     }

   }

   return result;

 }

 // converts a utf8 string to quoted ascii

 void UNICODE::as_quoted_ascii(const jchar* base, int length, char* buf, int buflen) {

   char* p = buf;

   char* end = buf + buflen;

   for (int index = 0; index < length; index++) {

     jchar c = base[index];

     if (c >= 32 && c < 127) {

       if (p + 1 >= end) break;      // string is truncated

       *p++ = (char)c;

     } else {

       if (p + 6 >= end) break;      // string is truncated

       sprintf(p, "\\u%04x", c);

       p += 6;

     }

   }

   *p = '\0';

 }