mirror of
https://github.com/tmux/tmux.git
synced 2025-11-04 09:26:05 +00:00
Add UTF-8 regress test.
This commit is contained in:
Nicholas Marriott
301
regress/utf8-test.result
Normal file
301
regress/utf8-test.result
Normal file
@@ -0,0 +1,301 @@
|
||||
UTF-8 decoder capability and stress test
|
||||
----------------------------------------
|
||||
|
||||
Markus Kuhn <http://www.cl.cam.ac.uk/~mgk25/> - 2015-08-28 - CC BY 4.0
|
||||
|
||||
This test file can help you examine, how your UTF-8 decoder handles
|
||||
various types of correct, malformed, or otherwise interesting UTF-8
|
||||
sequences. This file is not meant to be a conformance test. It does
|
||||
not prescribe any particular outcome. Therefore, there is no way to
|
||||
"pass" or "fail" this test file, even though the text does suggest a
|
||||
preferable decoder behaviour at some places. Its aim is, instead, to
|
||||
help you think about, and test, the behaviour of your UTF-8 decoder on a
|
||||
systematic collection of unusual inputs. Experience so far suggests
|
||||
that most first-time authors of UTF-8 decoders find at least one
|
||||
serious problem in their decoder using this file.
|
||||
|
||||
The test lines below cover boundary conditions, malformed UTF-8
|
||||
sequences, as well as correctly encoded UTF-8 sequences of Unicode code
|
||||
points that should never occur in a correct UTF-8 file.
|
||||
|
||||
According to ISO 10646-1:2000, sections D.7 and 2.3c, a device
|
||||
receiving UTF-8 shall interpret a "malformed sequence in the same way
|
||||
that it interprets a character that is outside the adopted subset" and
|
||||
"characters that are not within the adopted subset shall be indicated
|
||||
to the user" by a receiving device. One commonly used approach in
|
||||
UTF-8 decoders is to replace any malformed UTF-8 sequence by a
|
||||
replacement character (U+FFFD), which looks a bit like an inverted
|
||||
question mark, or a similar symbol. It might be a good idea to
|
||||
visually distinguish a malformed UTF-8 sequence from a correctly
|
||||
encoded Unicode character that is just not available in the current
|
||||
font but otherwise fully legal, even though ISO 10646-1 doesn't
|
||||
mandate this. In any case, just ignoring malformed sequences or
|
||||
unavailable characters does not conform to ISO 10646, will make
|
||||
debugging more difficult, and can lead to user confusion.
|
||||
|
||||
Please check, whether a malformed UTF-8 sequence is (1) represented at
|
||||
all, (2) represented by exactly one single replacement character (or
|
||||
equivalent signal), and (3) the following quotation mark after an
|
||||
illegal UTF-8 sequence is correctly displayed, i.e. proper
|
||||
resynchronization takes place immediately after any malformed
|
||||
sequence. This file says "THE END" in the last line, so if you don't
|
||||
see that, your decoder crashed somehow before, which should always be
|
||||
cause for concern.
|
||||
|
||||
All lines in this file are exactly 79 characters long (plus the line
|
||||
feed). In addition, all lines end with "|", except for the two test
|
||||
lines 2.1.1 and 2.2.1, which contain non-printable ASCII controls
|
||||
U+0000 and U+007F. If you display this file with a fixed-width font,
|
||||
these "|" characters should all line up in column 79 (right margin).
|
||||
This allows you to test quickly, whether your UTF-8 decoder finds the
|
||||
correct number of characters in every line, that is whether each
|
||||
malformed sequences is replaced by a single replacement character.
|
||||
|
||||
Note that, as an alternative to the notion of malformed sequence used
|
||||
here, it is also a perfectly acceptable (and in some situations even
|
||||
preferable) solution to represent each individual byte of a malformed
|
||||
sequence with a replacement character. If you follow this strategy in
|
||||
your decoder, then please ignore the "|" column.
|
||||
|
||||
|
||||
Here come the tests: |
|
||||
|
|
||||
1 Some correct UTF-8 text |
|
||||
|
|
||||
You should see the Greek word 'kosme': "κόσμε" |
|
||||
|
|
||||
2 Boundary condition test cases |
|
||||
|
|
||||
2.1 First possible sequence of a certain length |
|
||||
|
|
||||
2.1.1 1 byte (U-00000000): ""
|
||||
2.1.2 2 bytes (U-00000080): "" |
|
||||
2.1.3 3 bytes (U-00000800): "ࠀ" |
|
||||
2.1.4 4 bytes (U-00010000): "𐀀" |
|
||||
2.1.5 5 bytes (U-00200000): "<22><><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
2.1.6 6 bytes (U-04000000): "<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
|
|
||||
2.2 Last possible sequence of a certain length |
|
||||
|
|
||||
2.2.1 1 byte (U-0000007F): ""
|
||||
2.2.2 2 bytes (U-000007FF): "߿" |
|
||||
2.2.3 3 bytes (U-0000FFFF): "" |
|
||||
2.2.4 4 bytes (U-001FFFFF): "<22><><EFBFBD><EFBFBD>" |
|
||||
2.2.5 5 bytes (U-03FFFFFF): "<22><><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
2.2.6 6 bytes (U-7FFFFFFF): "<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
|
|
||||
2.3 Other boundary conditions |
|
||||
|
|
||||
2.3.1 U-0000D7FF = ed 9f bf = "" |
|
||||
2.3.2 U-0000E000 = ee 80 80 = "" |
|
||||
2.3.3 U-0000FFFD = ef bf bd = "<22>" |
|
||||
2.3.4 U-0010FFFF = f4 8f bf bf = "" |
|
||||
2.3.5 U-00110000 = f4 90 80 80 = "<22>" |
|
||||
|
|
||||
3 Malformed sequences |
|
||||
|
|
||||
3.1 Unexpected continuation bytes |
|
||||
|
|
||||
Each unexpected continuation byte should be separately signalled as a |
|
||||
malformed sequence of its own. |
|
||||
|
|
||||
3.1.1 First continuation byte 0x80: "<22>" |
|
||||
3.1.2 Last continuation byte 0xbf: "<22>" |
|
||||
|
|
||||
3.1.3 2 continuation bytes: "<22><>" |
|
||||
3.1.4 3 continuation bytes: "<22><><EFBFBD>" |
|
||||
3.1.5 4 continuation bytes: "<22><><EFBFBD><EFBFBD>" |
|
||||
3.1.6 5 continuation bytes: "<22><><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
3.1.7 6 continuation bytes: "<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
3.1.8 7 continuation bytes: "<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
|
|
||||
3.1.9 Sequence of all 64 possible continuation bytes (0x80-0xbf): |
|
||||
|
|
||||
"<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
|
||||
<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
|
||||
<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
|
||||
<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
|
|
||||
3.2 Lonely start characters |
|
||||
|
|
||||
3.2.1 All 32 first bytes of 2-byte sequences (0xc0-0xdf), |
|
||||
each followed by a space character: |
|
||||
|
|
||||
"<22> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> |
|
||||
<20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> " |
|
||||
|
|
||||
3.2.2 All 16 first bytes of 3-byte sequences (0xe0-0xef), |
|
||||
each followed by a space character: |
|
||||
|
|
||||
"<22> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> <20> " |
|
||||
|
|
||||
3.2.3 All 8 first bytes of 4-byte sequences (0xf0-0xf7), |
|
||||
each followed by a space character: |
|
||||
|
|
||||
"<22> <20> <20> <20> <20> <20> <20> <20> " |
|
||||
|
|
||||
3.2.4 All 4 first bytes of 5-byte sequences (0xf8-0xfb), |
|
||||
each followed by a space character: |
|
||||
|
|
||||
"<22> <20> <20> <20> " |
|
||||
|
|
||||
3.2.5 All 2 first bytes of 6-byte sequences (0xfc-0xfd), |
|
||||
each followed by a space character: |
|
||||
|
|
||||
"<22> <20> " |
|
||||
|
|
||||
3.3 Sequences with last continuation byte missing |
|
||||
|
|
||||
All bytes of an incomplete sequence should be signalled as a single |
|
||||
malformed sequence, i.e., you should see only a single replacement |
|
||||
character in each of the next 10 tests. (Characters as in section 2) |
|
||||
|
|
||||
3.3.1 2-byte sequence with last byte missing (U+0000): "<22>" |
|
||||
3.3.2 3-byte sequence with last byte missing (U+0000): "<22>" |
|
||||
3.3.3 4-byte sequence with last byte missing (U+0000): "<22>" |
|
||||
3.3.4 5-byte sequence with last byte missing (U+0000): "<22><><EFBFBD><EFBFBD>" |
|
||||
3.3.5 6-byte sequence with last byte missing (U+0000): "<22><><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
3.3.6 2-byte sequence with last byte missing (U-000007FF): "<22>" |
|
||||
3.3.7 3-byte sequence with last byte missing (U-0000FFFF): "<22>" |
|
||||
3.3.8 4-byte sequence with last byte missing (U-001FFFFF): "<22><><EFBFBD>" |
|
||||
3.3.9 5-byte sequence with last byte missing (U-03FFFFFF): "<22><><EFBFBD><EFBFBD>" |
|
||||
3.3.10 6-byte sequence with last byte missing (U-7FFFFFFF): "<22><><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
|
|
||||
3.4 Concatenation of incomplete sequences |
|
||||
|
|
||||
All the 10 sequences of 3.3 concatenated, you should see 10 malformed |
|
||||
sequences being signalled: |
|
||||
|
|
||||
"<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
|
|
||||
3.5 Impossible bytes |
|
||||
|
|
||||
The following two bytes cannot appear in a correct UTF-8 string |
|
||||
|
|
||||
3.5.1 fe = "<22>" |
|
||||
3.5.2 ff = "<22>" |
|
||||
3.5.3 fe fe ff ff = "<22><><EFBFBD><EFBFBD>" |
|
||||
|
|
||||
4 Overlong sequences |
|
||||
|
|
||||
The following sequences are not malformed according to the letter of |
|
||||
the Unicode 2.0 standard. However, they are longer then necessary and |
|
||||
a correct UTF-8 encoder is not allowed to produce them. A "safe UTF-8 |
|
||||
decoder" should reject them just like malformed sequences for two |
|
||||
reasons: (1) It helps to debug applications if overlong sequences are |
|
||||
not treated as valid representations of characters, because this helps |
|
||||
to spot problems more quickly. (2) Overlong sequences provide |
|
||||
alternative representations of characters, that could maliciously be |
|
||||
used to bypass filters that check only for ASCII characters. For |
|
||||
instance, a 2-byte encoded line feed (LF) would not be caught by a |
|
||||
line counter that counts only 0x0a bytes, but it would still be |
|
||||
processed as a line feed by an unsafe UTF-8 decoder later in the |
|
||||
pipeline. From a security point of view, ASCII compatibility of UTF-8 |
|
||||
sequences means also, that ASCII characters are *only* allowed to be |
|
||||
represented by ASCII bytes in the range 0x00-0x7f. To ensure this |
|
||||
aspect of ASCII compatibility, use only "safe UTF-8 decoders" that |
|
||||
reject overlong UTF-8 sequences for which a shorter encoding exists. |
|
||||
|
|
||||
4.1 Examples of an overlong ASCII character |
|
||||
|
|
||||
With a safe UTF-8 decoder, all of the following five overlong |
|
||||
representations of the ASCII character slash ("/") should be rejected |
|
||||
like a malformed UTF-8 sequence, for instance by substituting it with |
|
||||
a replacement character. If you see a slash below, you do not have a |
|
||||
safe UTF-8 decoder! |
|
||||
|
|
||||
4.1.1 U+002F = c0 af = "<22><>" |
|
||||
4.1.2 U+002F = e0 80 af = "<22>" |
|
||||
4.1.3 U+002F = f0 80 80 af = "<22>" |
|
||||
4.1.4 U+002F = f8 80 80 80 af = "<22><><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
4.1.5 U+002F = fc 80 80 80 80 af = "<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
|
|
||||
4.2 Maximum overlong sequences |
|
||||
|
|
||||
Below you see the highest Unicode value that is still resulting in an |
|
||||
overlong sequence if represented with the given number of bytes. This |
|
||||
is a boundary test for safe UTF-8 decoders. All five characters should |
|
||||
be rejected like malformed UTF-8 sequences. |
|
||||
|
|
||||
4.2.1 U-0000007F = c1 bf = "<22><>" |
|
||||
4.2.2 U-000007FF = e0 9f bf = "<22>" |
|
||||
4.2.3 U-0000FFFF = f0 8f bf bf = "<22>" |
|
||||
4.2.4 U-001FFFFF = f8 87 bf bf bf = "<22><><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
4.2.5 U-03FFFFFF = fc 83 bf bf bf bf = "<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
|
|
||||
4.3 Overlong representation of the NUL character |
|
||||
|
|
||||
The following five sequences should also be rejected like malformed |
|
||||
UTF-8 sequences and should not be treated like the ASCII NUL |
|
||||
character. |
|
||||
|
|
||||
4.3.1 U+0000 = c0 80 = "<22><>" |
|
||||
4.3.2 U+0000 = e0 80 80 = "<22>" |
|
||||
4.3.3 U+0000 = f0 80 80 80 = "<22>" |
|
||||
4.3.4 U+0000 = f8 80 80 80 80 = "<22><><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
4.3.5 U+0000 = fc 80 80 80 80 80 = "<22><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>" |
|
||||
|
|
||||
5 Illegal code positions |
|
||||
|
|
||||
The following UTF-8 sequences should be rejected like malformed |
|
||||
sequences, because they never represent valid ISO 10646 characters and |
|
||||
a UTF-8 decoder that accepts them might introduce security problems |
|
||||
comparable to overlong UTF-8 sequences. |
|
||||
|
|
||||
5.1 Single UTF-16 surrogates |
|
||||
|
|
||||
5.1.1 U+D800 = ed a0 80 = "<22>" |
|
||||
5.1.2 U+DB7F = ed ad bf = "<22>" |
|
||||
5.1.3 U+DB80 = ed ae 80 = "<22>" |
|
||||
5.1.4 U+DBFF = ed af bf = "<22>" |
|
||||
5.1.5 U+DC00 = ed b0 80 = "<22>" |
|
||||
5.1.6 U+DF80 = ed be 80 = "<22>" |
|
||||
5.1.7 U+DFFF = ed bf bf = "<22>" |
|
||||
|
|
||||
5.2 Paired UTF-16 surrogates |
|
||||
|
|
||||
5.2.1 U+D800 U+DC00 = ed a0 80 ed b0 80 = "<22><>" |
|
||||
5.2.2 U+D800 U+DFFF = ed a0 80 ed bf bf = "<22><>" |
|
||||
5.2.3 U+DB7F U+DC00 = ed ad bf ed b0 80 = "<22><>" |
|
||||
5.2.4 U+DB7F U+DFFF = ed ad bf ed bf bf = "<22><>" |
|
||||
5.2.5 U+DB80 U+DC00 = ed ae 80 ed b0 80 = "<22><>" |
|
||||
5.2.6 U+DB80 U+DFFF = ed ae 80 ed bf bf = "<22><>" |
|
||||
5.2.7 U+DBFF U+DC00 = ed af bf ed b0 80 = "<22><>" |
|
||||
5.2.8 U+DBFF U+DFFF = ed af bf ed bf bf = "<22><>" |
|
||||
|
|
||||
5.3 Noncharacter code positions |
|
||||
|
|
||||
The following "noncharacters" are "reserved for internal use" by |
|
||||
applications, and according to older versions of the Unicode Standard |
|
||||
"should never be interchanged". Unicode Corrigendum #9 dropped the |
|
||||
latter restriction. Nevertheless, their presence in incoming UTF-8 data |
|
||||
can remain a potential security risk, depending on what use is made of |
|
||||
these codes subsequently. Examples of such internal use: |
|
||||
|
|
||||
- Some file APIs with 16-bit characters may use the integer value -1 |
|
||||
= U+FFFF to signal an end-of-file (EOF) or error condition. |
|
||||
|
|
||||
- In some UTF-16 receivers, code point U+FFFE might trigger a |
|
||||
byte-swap operation (to convert between UTF-16LE and UTF-16BE). |
|
||||
|
|
||||
With such internal use of noncharacters, it may be desirable and safer |
|
||||
to block those code points in UTF-8 decoders, as they should never |
|
||||
occur legitimately in incoming UTF-8 data, and could trigger unsafe |
|
||||
behaviour in subsequent processing. |
|
||||
|
|
||||
Particularly problematic noncharacters in 16-bit applications: |
|
||||
|
|
||||
5.3.1 U+FFFE = ef bf be = "" |
|
||||
5.3.2 U+FFFF = ef bf bf = "" |
|
||||
|
|
||||
Other noncharacters: |
|
||||
|
|
||||
5.3.3 U+FDD0 .. U+FDEF = ""|
|
||||
|
|
||||
5.3.4 U+nFFFE U+nFFFF (for n = 1..10) |
|
||||
|
|
||||
" |
|
||||
" |
|
||||
|
|
||||
THE END |
|
||||
|
||||
Reference in New Issue
Block a user