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-rw-r--r--src/UniConversion.cxx87
-rw-r--r--test/unit/testUniConversion.cxx79
2 files changed, 90 insertions, 76 deletions
diff --git a/src/UniConversion.cxx b/src/UniConversion.cxx
index 16a9cef8a..39f553bc2 100644
--- a/src/UniConversion.cxx
+++ b/src/UniConversion.cxx
@@ -229,6 +229,7 @@ unsigned int UTF16FromUTF32Character(unsigned int val, wchar_t *tbuf) {
}
}
+// generated by scripts/GenerateCharTable.py
const unsigned char UTF8BytesOfLead[256] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 00 - 0F
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 10 - 1F
@@ -256,39 +257,28 @@ const unsigned char UTF8BytesOfLead[256] = {
// not have associated glyphs.
int UTF8Classify(const unsigned char *us, int len) {
// For the rules: http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
- if (*us < 0x80) {
- // Single bytes easy
+ if (us[0] < 0x80) {
+ // ASCII
return 1;
- } else if (*us > 0xf4) {
- // Characters longer than 4 bytes not possible in current UTF-8
+ }
+
+ const int byteCount = UTF8BytesOfLead[us[0]];
+ if (byteCount == 1 || byteCount > len) {
+ // Invalid lead byte
return UTF8MaskInvalid | 1;
- } else if (*us >= 0xf0) {
- // 4 bytes
- if (len < 4)
- return UTF8MaskInvalid | 1;
- if (UTF8IsTrailByte(us[1]) && UTF8IsTrailByte(us[2]) && UTF8IsTrailByte(us[3])) {
- if (((us[1] & 0xf) == 0xf) && (us[2] == 0xbf) && ((us[3] == 0xbe) || (us[3] == 0xbf))) {
- // *FFFE or *FFFF non-character
- return UTF8MaskInvalid | 4;
- }
- if (*us == 0xf4) {
- // Check if encoding a value beyond the last Unicode character 10FFFF
- if (us[1] > 0x8f) {
- return UTF8MaskInvalid | 1;
- }
- } else if ((*us == 0xf0) && ((us[1] & 0xf0) == 0x80)) {
- // Overlong
- return UTF8MaskInvalid | 1;
- }
- return 4;
- } else {
- return UTF8MaskInvalid | 1;
- }
- } else if (*us >= 0xe0) {
- // 3 bytes
- if (len < 3)
- return UTF8MaskInvalid | 1;
- if (UTF8IsTrailByte(us[1]) && UTF8IsTrailByte(us[2])) {
+ }
+
+ if (!UTF8IsTrailByte(us[1])) {
+ // Invalid trail byte
+ return UTF8MaskInvalid | 1;
+ }
+
+ switch (byteCount) {
+ case 2:
+ return 2;
+
+ case 3:
+ if (UTF8IsTrailByte(us[2])) {
if ((*us == 0xe0) && ((us[1] & 0xe0) == 0x80)) {
// Overlong
return UTF8MaskInvalid | 1;
@@ -310,23 +300,30 @@ int UTF8Classify(const unsigned char *us, int len) {
return UTF8MaskInvalid | 3;
}
return 3;
- } else {
- return UTF8MaskInvalid | 1;
}
- } else if (*us >= 0xc2) {
- // 2 bytes
- if (len < 2)
- return UTF8MaskInvalid | 1;
- if (UTF8IsTrailByte(us[1])) {
- return 2;
- } else {
- return UTF8MaskInvalid | 1;
+ break;
+
+ default:
+ if (UTF8IsTrailByte(us[2]) && UTF8IsTrailByte(us[3])) {
+ if (((us[1] & 0xf) == 0xf) && (us[2] == 0xbf) && ((us[3] == 0xbe) || (us[3] == 0xbf))) {
+ // *FFFE or *FFFF non-character
+ return UTF8MaskInvalid | 4;
+ }
+ if (*us == 0xf4) {
+ // Check if encoding a value beyond the last Unicode character 10FFFF
+ if (us[1] > 0x8f) {
+ return UTF8MaskInvalid | 1;
+ }
+ } else if ((*us == 0xf0) && ((us[1] & 0xf0) == 0x80)) {
+ // Overlong
+ return UTF8MaskInvalid | 1;
+ }
+ return 4;
}
- } else {
- // 0xc0 .. 0xc1 is overlong encoding
- // 0x80 .. 0xbf is trail byte
- return UTF8MaskInvalid | 1;
+ break;
}
+
+ return UTF8MaskInvalid | 1;
}
int UTF8DrawBytes(const unsigned char *us, int len) {
diff --git a/test/unit/testUniConversion.cxx b/test/unit/testUniConversion.cxx
index 4bb7d361a..63b56c426 100644
--- a/test/unit/testUniConversion.cxx
+++ b/test/unit/testUniConversion.cxx
@@ -257,8 +257,8 @@ int UTFClass(const char *s) {
TEST_CASE("UTF8Classify") {
- // These tests are supposed to hit every return statement in UTF8Classify once in order
- // except the last which is hit twice.
+ // These tests are supposed to hit every return statement in UTF8Classify in order
+ // with some hit multiple times.
// Single byte
@@ -268,34 +268,45 @@ TEST_CASE("UTF8Classify") {
SECTION("UTF8Classify Invalid Too large lead") {
REQUIRE(UTFClass("\xF5") == (1|UTF8MaskInvalid));
}
+ SECTION("UTF8Classify Overlong") {
+ REQUIRE(UTFClass("\xC0\x80") == (1 | UTF8MaskInvalid));
+ }
+ SECTION("UTF8Classify single trail byte") {
+ REQUIRE(UTFClass("\x80") == (1 | UTF8MaskInvalid));
+ }
- // 4 byte lead
+ // Invalid length tests
- SECTION("UTF8Classify 4 byte lead, string less than 4 long") {
- REQUIRE(UTFClass("\xF0") == (1 | UTF8MaskInvalid));
+ SECTION("UTF8Classify 2 byte lead, string less than 2 long") {
+ REQUIRE(UTFClass("\xD0") == (1 | UTF8MaskInvalid));
}
- SECTION("UTF8Classify 1FFFF non-character") {
- REQUIRE(UTFClass("\xF0\x9F\xBF\xBF") == (4 | UTF8MaskInvalid));
+ SECTION("UTF8Classify 3 byte lead, string less than 3 long") {
+ REQUIRE(UTFClass("\xEF") == (1 | UTF8MaskInvalid));
}
- SECTION("UTF8Classify 1 Greater than max Unicode 110000") {
- // Maximum Unicode value is 10FFFF so 110000 is out of range
- REQUIRE(UTFClass("\xF4\x90\x80\x80") == (1 | UTF8MaskInvalid));
+ SECTION("UTF8Classify 4 byte lead, string less than 4 long") {
+ REQUIRE(UTFClass("\xF0") == (1 | UTF8MaskInvalid));
}
- SECTION("UTF8Classify 4 byte overlong") {
- REQUIRE(UTFClass("\xF0\x80\x80\x80") == (1 | UTF8MaskInvalid));
+
+ // Invalid first trail byte tests
+
+ SECTION("UTF8Classify 2 byte lead trail is invalid") {
+ REQUIRE(UTFClass("\xD0q") == (1 | UTF8MaskInvalid));
}
- SECTION("UTF8Classify 4 byte valid character") {
- REQUIRE(UTFClass("\xF0\x9F\x8C\x90") == 4);
+ SECTION("UTF8Classify 3 byte lead invalid trails") {
+ REQUIRE(UTFClass("\xE2qq") == (1 | UTF8MaskInvalid));
}
SECTION("UTF8Classify 4 byte bad trails") {
REQUIRE(UTFClass("\xF0xyz") == (1 | UTF8MaskInvalid));
}
- // 3 byte lead
+ // 2 byte lead
- SECTION("UTF8Classify 3 byte lead, string less than 3 long") {
- REQUIRE(UTFClass("\xEF") == (1 | UTF8MaskInvalid));
+ SECTION("UTF8Classify 2 byte valid character") {
+ REQUIRE(UTFClass("\xD0\x80") == 2);
}
+
+ // 3 byte lead
+
SECTION("UTF8Classify 3 byte lead, overlong") {
REQUIRE(UTFClass("\xE0\x80\xAF") == (1 | UTF8MaskInvalid));
}
@@ -314,25 +325,31 @@ TEST_CASE("UTF8Classify") {
SECTION("UTF8Classify 3 byte valid character") {
REQUIRE(UTFClass("\xE2\x82\xAC") == 3);
}
- SECTION("UTF8Classify 3 byte bad trails") {
- REQUIRE(UTFClass("\xE2qq") == (1 | UTF8MaskInvalid));
- }
- // 2 byte lead
+ // 4 byte lead
- SECTION("UTF8Classify 2 byte lead, string less than 2 long") {
- REQUIRE(UTFClass("\xD0") == (1 | UTF8MaskInvalid));
+ SECTION("UTF8Classify 1FFFF non-character") {
+ REQUIRE(UTFClass("\xF0\x9F\xBF\xBF") == (4 | UTF8MaskInvalid));
}
- SECTION("UTF8Classify 2 byte valid character") {
- REQUIRE(UTFClass("\xD0\x80") == 2);
+ SECTION("UTF8Classify 1 Greater than max Unicode 110000") {
+ // Maximum Unicode value is 10FFFF so 110000 is out of range
+ REQUIRE(UTFClass("\xF4\x90\x80\x80") == (1 | UTF8MaskInvalid));
}
- SECTION("UTF8Classify 2 byte lead trail is invalid") {
- REQUIRE(UTFClass("\xD0q") == (1 | UTF8MaskInvalid));
+ SECTION("UTF8Classify 4 byte overlong") {
+ REQUIRE(UTFClass("\xF0\x80\x80\x80") == (1 | UTF8MaskInvalid));
}
- SECTION("UTF8Classify Overlong") {
- REQUIRE(UTFClass("\xC0") == (1 | UTF8MaskInvalid));
+ SECTION("UTF8Classify 4 byte valid character") {
+ REQUIRE(UTFClass("\xF0\x9F\x8C\x90") == 4);
}
- SECTION("UTF8Classify single trail byte") {
- REQUIRE(UTFClass("\x80") == (1 | UTF8MaskInvalid));
+
+ // Invalid 2nd or 3rd continuation bytes
+ SECTION("UTF8Classify 3 byte lead invalid 2nd trail") {
+ REQUIRE(UTFClass("\xE2\x82q") == (1 | UTF8MaskInvalid));
+ }
+ SECTION("UTF8Classify 4 byte lead invalid 2nd trail") {
+ REQUIRE(UTFClass("\xF0\x9Fq\x9F") == (1 | UTF8MaskInvalid));
+ }
+ SECTION("UTF8Classify 4 byte lead invalid 3rd trail") {
+ REQUIRE(UTFClass("\xF0\x9F\x9Fq") == (1 | UTF8MaskInvalid));
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 04:14:05 +0000