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AsciiString.lastIndexOf(...) is implemented incorrectly (#9103)

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Motivation

@xiaoheng1 reported incorrect behaviour of AsciiString.lastIndexOf in
#9099. Upon closer inspection it appears that it was never implemented
correctly and searches between the provided index and the end of the
string similar to indexOf(...), rather than between the provided index
and the beginning of the string as the javadoc states (and in line with
java.lang.String).

Modifications

Fix AsciiString.lastIndexOf implementation and corresponding unit tests
to behave the same as the equivalent String methods.

Result

Fixes #9099
This commit is contained in:
Nick Hill 2019-05-12 22:03:32 -07:00 committed by Norman Maurer
parent 60de092e36
commit cb85e03d72
2 changed files with 15 additions and 18 deletions
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15
common/src/main/java/io/netty/util/AsciiString.java
View File

@ -746,7 +746,7 @@ public final class AsciiString implements CharSequence, Comparable<CharSequence>
*/
public int lastIndexOf(CharSequence string) {
// Use count instead of count - 1 so lastIndexOf("") answers count
return lastIndexOf(string, length());
return lastIndexOf(string, length);
}
/**
@ -761,23 +761,20 @@ public final class AsciiString implements CharSequence, Comparable<CharSequence>
*/
public int lastIndexOf(CharSequence subString, int start) {
final int subCount = subString.length();
start = Math.min(start, length - subCount);
if (start < 0) {
start = 0;
}
if (subCount <= 0) {
return start < length ? start : length;
}
if (subCount > length - start) {
return INDEX_NOT_FOUND;
}
if (subCount == 0) {
return start;
}
final char firstChar = subString.charAt(0);
if (firstChar > MAX_CHAR_VALUE) {
return INDEX_NOT_FOUND;
}
final byte firstCharAsByte = c2b0(firstChar);
final int end = offset + start;
for (int i = offset + length - subCount; i >= end; --i) {
for (int i = offset + start; i >= 0; --i) {
if (value[i] == firstCharAsByte) {
int o1 = i, o2 = 0;
while (++o2 < subCount && b2c(value[++o1]) == subString.charAt(o2)) {

18
common/src/test/java/io/netty/util/AsciiStringCharacterTest.java
View File

@ -356,15 +356,15 @@ public class AsciiStringCharacterTest {
@Test
public void testLastIndexOfCharSequence() {
assertEquals(0, new AsciiString("abcd").lastIndexOf("abcd", 0));
assertEquals(0, new AsciiString("abcd").lastIndexOf("abc", 0));
assertEquals(1, new AsciiString("abcd").lastIndexOf("bcd", 0));
assertEquals(1, new AsciiString("abcd").lastIndexOf("bc", 0));
assertEquals(5, new AsciiString("abcdabcd").lastIndexOf("bcd", 0));
assertEquals(0, new AsciiString("abcd", 1, 2).lastIndexOf("bc", 0));
assertEquals(0, new AsciiString("abcd", 1, 3).lastIndexOf("bcd", 0));
assertEquals(1, new AsciiString("abcdabcd", 4, 4).lastIndexOf("bcd", 0));
assertEquals(0, new AsciiString("abcd").lastIndexOf("abc", 4));
assertEquals(1, new AsciiString("abcd").lastIndexOf("bcd", 4));
assertEquals(1, new AsciiString("abcd").lastIndexOf("bc", 4));
assertEquals(5, new AsciiString("abcdabcd").lastIndexOf("bcd", 10));
assertEquals(0, new AsciiString("abcd", 1, 2).lastIndexOf("bc", 2));
assertEquals(0, new AsciiString("abcd", 1, 3).lastIndexOf("bcd", 3));
assertEquals(1, new AsciiString("abcdabcd", 4, 4).lastIndexOf("bcd", 4));
assertEquals(3, new AsciiString("012345").lastIndexOf("345", 3));
assertEquals(3, new AsciiString("012345").lastIndexOf("345", 0));
assertEquals(3, new AsciiString("012345").lastIndexOf("345", 6));
// Test with empty string
assertEquals(0, new AsciiString("abcd").lastIndexOf("", 0));
@ -376,7 +376,7 @@ public class AsciiStringCharacterTest {
assertEquals(-1, new AsciiString("abcdbc").lastIndexOf("bce", 0));
assertEquals(-1, new AsciiString("abcd", 1, 3).lastIndexOf("abc", 0));
assertEquals(-1, new AsciiString("abcd", 1, 2).lastIndexOf("bd", 0));
assertEquals(-1, new AsciiString("012345").lastIndexOf("345", 4));
assertEquals(-1, new AsciiString("012345").lastIndexOf("345", 2));
assertEquals(-1, new AsciiString("012345").lastIndexOf("abc", 3));
assertEquals(-1, new AsciiString("012345").lastIndexOf("abc", 0));
assertEquals(-1, new AsciiString("012345").lastIndexOf("abcdefghi", 0));