--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/utilities/utf8.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,539 @@
+/*
+ * Copyright (c) 1997, 2016, 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.
+template<typename T> char* UTF8::next(const char* str, T* 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 = (T)ptr[0]; /* default bad result; */
+ return (char*)(ptr + 1); // make progress somehow
+ }
+
+ *value = (T)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, bool& is_latin1, bool& has_multibyte) {
+ int num_chars = len;
+ has_multibyte = false;
+ is_latin1 = true;
+ unsigned char prev = 0;
+ for (int i = 0; i < len; i++) {
+ unsigned char c = str[i];
+ if ((c & 0xC0) == 0x80) {
+ // Multibyte, check if valid latin1 character.
+ has_multibyte = true;
+ if (prev > 0xC3) {
+ is_latin1 = false;
+ }
+ --num_chars;
+ }
+ prev = c;
+ }
+ 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, bool& is_latin1, bool& has_multibyte) {
+ int num_chars = 0;
+ has_multibyte = false;
+ is_latin1 = true;
+ unsigned char prev = 0;
+ for (const char* p = str; *p; p++) {
+ unsigned char c = (*p);
+ if ((c & 0xC0) == 0x80) {
+ // Multibyte, check if valid latin1 character.
+ has_multibyte = true;
+ if (prev > 0xC3) {
+ is_latin1 = false;
+ }
+ } else {
+ num_chars++;
+ }
+ prev = c;
+ }
+ return num_chars;
+}
+
+// Writes a jchar as 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;
+}
+
+template<typename T> void UTF8::convert_to_unicode(const char* utf8_str, T* 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] = (T)ch;
+ ptr = (const char *)(ptr + 1);
+ }
+
+ for (; index < unicode_length; index++) {
+ ptr = UTF8::next(ptr, &unicode_str[index]);
+ }
+}
+
+// Explicit instantiation for all supported string types.
+template char* UTF8::next<jchar>(const char* str, jchar* value);
+template char* UTF8::next<jbyte>(const char* str, jbyte* value);
+template void UTF8::convert_to_unicode<jchar>(const char* utf8_str, jchar* unicode_str, int unicode_length);
+template void UTF8::convert_to_unicode<jbyte>(const char* utf8_str, jbyte* unicode_str, int unicode_length);
+
+// 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, int utf8_length, char* buf, int buflen) {
+ const char *ptr = utf8_str;
+ const char *utf8_end = ptr + utf8_length;
+ char* p = buf;
+ char* end = buf + buflen;
+ while (ptr < utf8_end) {
+ 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;
+ }
+ }
+ assert(p < end, "sanity");
+ *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);
+}
+
+bool UTF8::is_legal_utf8(const unsigned char* buffer, int length,
+ bool version_leq_47) {
+ int i = 0;
+ int count = length >> 2;
+ for (int k=0; k<count; k++) {
+ unsigned char b0 = buffer[i];
+ unsigned char b1 = buffer[i+1];
+ unsigned char b2 = buffer[i+2];
+ unsigned char b3 = buffer[i+3];
+ // For an unsigned char v,
+ // (v | v - 1) is < 128 (highest bit 0) for 0 < v < 128;
+ // (v | v - 1) is >= 128 (highest bit 1) for v == 0 or v >= 128.
+ unsigned char res = b0 | b0 - 1 |
+ b1 | b1 - 1 |
+ b2 | b2 - 1 |
+ b3 | b3 - 1;
+ if (res >= 128) break;
+ i += 4;
+ }
+ for(; i < length; i++) {
+ unsigned short c;
+ // no embedded zeros
+ if (buffer[i] == 0) return false;
+ if(buffer[i] < 128) {
+ continue;
+ }
+ if ((i + 5) < length) { // see if it's legal supplementary character
+ if (UTF8::is_supplementary_character(&buffer[i])) {
+ c = UTF8::get_supplementary_character(&buffer[i]);
+ i += 5;
+ continue;
+ }
+ }
+ switch (buffer[i] >> 4) {
+ default: break;
+ case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
+ return false;
+ case 0xC: case 0xD: // 110xxxxx 10xxxxxx
+ c = (buffer[i] & 0x1F) << 6;
+ i++;
+ if ((i < length) && ((buffer[i] & 0xC0) == 0x80)) {
+ c += buffer[i] & 0x3F;
+ if (version_leq_47 || c == 0 || c >= 0x80) {
+ break;
+ }
+ }
+ return false;
+ case 0xE: // 1110xxxx 10xxxxxx 10xxxxxx
+ c = (buffer[i] & 0xF) << 12;
+ i += 2;
+ if ((i < length) && ((buffer[i-1] & 0xC0) == 0x80) && ((buffer[i] & 0xC0) == 0x80)) {
+ c += ((buffer[i-1] & 0x3F) << 6) + (buffer[i] & 0x3F);
+ if (version_leq_47 || c >= 0x800) {
+ break;
+ }
+ }
+ return false;
+ } // end of switch
+ } // end of for
+ return true;
+}
+
+//-------------------------------------------------------------------------------------
+
+bool UNICODE::is_latin1(jchar c) {
+ return (c <= 0x00FF);
+}
+
+bool UNICODE::is_latin1(jchar* base, int length) {
+ for (int index = 0; index < length; index++) {
+ if (base[index] > 0x00FF) {
+ return false;
+ }
+ }
+ return true;
+}
+
+int UNICODE::utf8_size(jchar c) {
+ if ((0x0001 <= c) && (c <= 0x007F)) {
+ // ASCII character
+ return 1;
+ } else if (c <= 0x07FF) {
+ return 2;
+ } else {
+ return 3;
+ }
+}
+
+int UNICODE::utf8_size(jbyte c) {
+ if (c >= 0x01) {
+ // ASCII character. Check is equivalent to
+ // (0x01 <= c) && (c <= 0x7F) because c is signed.
+ return 1;
+ } else {
+ // Non-ASCII character or 0x00 which needs to be
+ // two-byte encoded as 0xC080 in modified UTF-8.
+ return 2;
+ }
+}
+
+template<typename T>
+int UNICODE::utf8_length(T* base, int length) {
+ int result = 0;
+ for (int index = 0; index < length; index++) {
+ T c = base[index];
+ result += utf8_size(c);
+ }
+ return result;
+}
+
+template<typename T>
+char* UNICODE::as_utf8(T* base, int& length) {
+ int utf8_len = utf8_length(base, length);
+ u_char* buf = NEW_RESOURCE_ARRAY(u_char, utf8_len + 1);
+ char* result = as_utf8(base, length, (char*) buf, utf8_len + 1);
+ assert((int) strlen(result) == utf8_len, "length prediction must be correct");
+ // Set string length to uft8 length
+ length = utf8_len;
+ return (char*) result;
+}
+
+char* UNICODE::as_utf8(jchar* base, int length, char* buf, int buflen) {
+ u_char* p = (u_char*)buf;
+ for (int index = 0; index < length; index++) {
+ jchar c = base[index];
+ buflen -= utf8_size(c);
+ if (buflen <= 0) break; // string is truncated
+ p = utf8_write(p, c);
+ }
+ *p = '\0';
+ return buf;
+}
+
+char* UNICODE::as_utf8(jbyte* 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++) {
+ jbyte c = base[index];
+ int sz = utf8_size(c);
+ buflen -= sz;
+ if (buflen <= 0) break; // string is truncated
+ if (sz == 1) {
+ // Copy ASCII characters (UTF-8 is ASCII compatible)
+ *p++ = c;
+ } else {
+ // Non-ASCII character or 0x00 which should
+ // be encoded as 0xC080 in "modified" UTF8.
+ p = utf8_write(p, ((jchar) c) & 0xff);
+ }
+ }
+ *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
+template<typename T>
+int UNICODE::quoted_ascii_length(T* base, int length) {
+ int result = 0;
+ for (int i = 0; i < length; i++) {
+ T c = base[i];
+ if (c >= 32 && c < 127) {
+ result++;
+ } else {
+ result += 6;
+ }
+ }
+ return result;
+}
+
+// converts a unicode string to quoted ascii
+template<typename T>
+void UNICODE::as_quoted_ascii(const T* base, int length, char* buf, int buflen) {
+ char* p = buf;
+ char* end = buf + buflen;
+ for (int index = 0; index < length; index++) {
+ T 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';
+}
+
+// Explicit instantiation for all supported types.
+template int UNICODE::utf8_length(jbyte* base, int length);
+template int UNICODE::utf8_length(jchar* base, int length);
+template char* UNICODE::as_utf8(jbyte* base, int& length);
+template char* UNICODE::as_utf8(jchar* base, int& length);
+template int UNICODE::quoted_ascii_length<jbyte>(jbyte* base, int length);
+template int UNICODE::quoted_ascii_length<jchar>(jchar* base, int length);
+template void UNICODE::as_quoted_ascii<jbyte>(const jbyte* base, int length, char* buf, int buflen);
+template void UNICODE::as_quoted_ascii<jchar>(const jchar* base, int length, char* buf, int buflen);