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/*
* Copyright (c) 2016, 2025, 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 "nmt/memTag.hpp"
#include "runtime/os.hpp"
#include "utilities/utf8.hpp"
#include "unittest.hpp"
static void stamp(char* p, size_t len) {
if (len > 0) {
::memset(p, 'A', len);
}
}
static bool test_stamp(const char* p, size_t len) {
for (const char* q = p; q < p + len; q++) {
if (*q != 'A') {
return false;
}
}
return true;
}
TEST_VM(utf8, jchar_length) {
char res[60];
jchar str[20];
for (int i = 0; i < 20; i++) {
str[i] = 0x0800; // char that is 2B in UTF-16 but 3B in UTF-8
}
str[19] = (jchar) '\0';
// The resulting string in UTF-8 is 3*19 bytes long, but should be truncated
stamp(res, sizeof(res));
UNICODE::as_utf8(str, 19, res, 10);
ASSERT_EQ(strlen(res), (size_t) 9) << "string should be truncated here";
ASSERT_TRUE(test_stamp(res + 10, sizeof(res) - 10));
stamp(res, sizeof(res));
UNICODE::as_utf8(str, 19, res, 18);
ASSERT_EQ(strlen(res), (size_t) 15) << "string should be truncated here";
ASSERT_TRUE(test_stamp(res + 18, sizeof(res) - 18));
stamp(res, sizeof(res));
UNICODE::as_utf8(str, 19, res, 20);
ASSERT_EQ(strlen(res), (size_t) 18) << "string should be truncated here";
ASSERT_TRUE(test_stamp(res + 20, sizeof(res) - 20));
// Test with an "unbounded" buffer
UNICODE::as_utf8(str, 19, res, INT_MAX);
ASSERT_EQ(strlen(res), (size_t) 3 * 19) << "string should end here";
// Test that we do not overflow the output buffer
for (int i = 1; i < 5; i ++) {
stamp(res, sizeof(res));
UNICODE::as_utf8(str, 19, res, i);
EXPECT_TRUE(test_stamp(res + i, sizeof(res) - i));
}
}
TEST_VM(utf8, jbyte_length) {
char res[60];
jbyte str[20];
for (int i = 0; i < 19; i++) {
str[i] = 0x42;
}
str[19] = '\0';
stamp(res, sizeof(res));
UNICODE::as_utf8(str, 19, res, 10);
ASSERT_EQ(strlen(res), (size_t) 9) << "string should be truncated here";
ASSERT_TRUE(test_stamp(res + 10, sizeof(res) - 10));
UNICODE::as_utf8(str, 19, res, INT_MAX);
ASSERT_EQ(strlen(res), (size_t) 19) << "string should end here";
// Test that we do not overflow the output buffer
for (int i = 1; i < 5; i ++) {
stamp(res, sizeof(res));
UNICODE::as_utf8(str, 19, res, i);
EXPECT_TRUE(test_stamp(res + i, sizeof(res) - i));
}
}
TEST_VM(utf8, truncation) {
// Test that truncation removes partial encodings as expected.
const char orig_bytes[] = { 'A', 'B', 'C', 'D', 'E', '\0' };
const int orig_length = sizeof(orig_bytes)/sizeof(char);
ASSERT_TRUE(UTF8::is_legal_utf8((const unsigned char*)orig_bytes, orig_length - 1, false));
const char* orig_str = &orig_bytes[0];
ASSERT_EQ((int)strlen(orig_str), orig_length - 1);
unsigned char* temp_bytes;
const char* temp_str;
char* utf8;
int n_utf8; // Number of bytes in the encoding
// Test 1: a valid UTF8 "ascii" ending string should be returned as-is
temp_bytes = (unsigned char*) os::malloc(sizeof(unsigned char) * orig_length, mtTest);
strcpy((char*)temp_bytes, orig_str);
temp_str = (const char*) temp_bytes;
UTF8::truncate_to_legal_utf8(temp_bytes, orig_length);
ASSERT_EQ((int)strlen(temp_str), orig_length - 1) << "bytes should be unchanged";
ASSERT_EQ(strcmp(orig_str, temp_str), 0) << "bytes should be unchanged";
os::free(temp_bytes);
// Test 2: a UTF8 sequence that "ends" with a 2-byte encoding
// drops the 2-byte encoding
jchar two_byte_char[] = { 0x00D1 }; // N with tilde
n_utf8 = 2;
utf8 = (char*) os::malloc(sizeof(char) * (n_utf8 + 1), mtTest); // plus NUL
UNICODE::convert_to_utf8(two_byte_char, 1, utf8);
int utf8_len = (int)strlen(utf8);
ASSERT_EQ(utf8_len, n_utf8) << "setup error";
// Now drop zero or one byte from the end and check it truncates as expected
for (int drop = 0; drop < n_utf8; drop++) {
int temp_len = orig_length + utf8_len - drop;
temp_bytes = (unsigned char*) os::malloc(sizeof(unsigned char) * temp_len, mtTest);
temp_str = (const char*) temp_bytes;
strcpy((char*)temp_bytes, orig_str);
strncat((char*)temp_bytes, utf8, utf8_len - drop);
ASSERT_EQ((int)strlen(temp_str), temp_len - 1) << "setup error";
UTF8::truncate_to_legal_utf8(temp_bytes, temp_len);
ASSERT_EQ((int)strlen(temp_str), orig_length - 1) << "bytes should be truncated to original length";
ASSERT_EQ(strcmp(orig_str, temp_str), 0) << "bytes should be truncated to original";
os::free(temp_bytes);
}
os::free(utf8);
// Test 3: a UTF8 sequence that "ends" with a 3-byte encoding
// drops the 3-byte encoding
n_utf8 = 3;
jchar three_byte_char[] = { 0x0800 };
utf8 = (char*) os::malloc(sizeof(char) * (n_utf8 + 1), mtTest); // plus NUL
UNICODE::convert_to_utf8(three_byte_char, 1, utf8);
utf8_len = (int)strlen(utf8);
ASSERT_EQ(utf8_len, n_utf8) << "setup error";
// Now drop zero, to two bytes from the end and check it truncates as expected
for (int drop = 0; drop < n_utf8; drop++) {
int temp_len = orig_length + utf8_len - drop;
temp_bytes = (unsigned char*) os::malloc(sizeof(unsigned char) * temp_len, mtTest);
temp_str = (const char*) temp_bytes;
strcpy((char*)temp_bytes, orig_str);
strncat((char*)temp_bytes, utf8, utf8_len - drop);
ASSERT_EQ((int)strlen(temp_str), temp_len - 1) << "setup error";
UTF8::truncate_to_legal_utf8(temp_bytes, temp_len);
ASSERT_EQ((int)strlen(temp_str), orig_length - 1) << "bytes should be truncated to original length";
ASSERT_EQ(strcmp(orig_str, temp_str), 0) << "bytes should be truncated to original";
os::free(temp_bytes);
}
os::free(utf8);
// Test 4: a UTF8 sequence that "ends" with a 6-byte encoding
// drops the 6-byte encoding
n_utf8 = 6;
jchar six_byte_char[] = { 0xD801, 0xDC37 }; // U+10437 as its UTF-16 surrogate pairs
utf8 = (char*) os::malloc(sizeof(char) * (n_utf8 + 1), mtTest); // plus NUL
UNICODE::convert_to_utf8(six_byte_char, 2, utf8);
utf8_len = (int)strlen(utf8);
ASSERT_EQ(utf8_len, n_utf8) << "setup error";
// Now drop zero to five bytes from the end and check it truncates as expected
for (int drop = 0; drop < n_utf8; drop++) {
int temp_len = orig_length + utf8_len - drop;
temp_bytes = (unsigned char*) os::malloc(sizeof(unsigned char) * temp_len, mtTest);
temp_str = (const char*) temp_bytes;
strcpy((char*)temp_bytes, orig_str);
strncat((char*)temp_bytes, utf8, utf8_len - drop);
ASSERT_EQ((int)strlen(temp_str), temp_len - 1) << "setup error";
UTF8::truncate_to_legal_utf8(temp_bytes, temp_len);
ASSERT_EQ((int)strlen(temp_str), orig_length - 1) << "bytes should be truncated to original length";
ASSERT_EQ(strcmp(orig_str, temp_str), 0) << "bytes should be truncated to original";
os::free(temp_bytes);
}
os::free(utf8);
}
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