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Code Issues Releases Wiki Activity

Tweak utf8 checks

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This commit is contained in:
Jay Berkenbilt 2023-12-27 10:48:54 -05:00
parent f5a1e2872e
commit a3b939ce58
5 changed files with 32 additions and 27 deletions
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10
libqpdf/QUtil.cc
View File

@ -1825,16 +1825,12 @@ QUtil::analyze_encoding(
bool any_errors = false;
while (pos < len) {
bool error = false;
auto old_pos = pos;
unsigned long codepoint = get_next_utf8_codepoint(val, pos, error);
auto o_pos = pos;
get_next_utf8_codepoint(val, pos, error);
if (error) {
any_errors = true;
for (auto p = old_pos; p < pos; p++) {
if (static_cast<unsigned char>(val.at(p)) >= 128) {
has_8bit_chars = true;
}
}
} else if (codepoint >= 128) {
if (pos - o_pos > 1 || val[o_pos] & 0x80) {
has_8bit_chars = true;
}
}

29
libtests/qutil.cc
View File

@ -269,20 +269,21 @@ to_utf8_test()
// Overlong characters: characters represented by more bytes than necessary.
size_t pos = 0;
std::string utf8 = "\xC0\x80" // 1 << 7
"\xE0\x80\x80" // 1 << 11
"\xF0\x80\x80\x80" // 1 << 16
"\xF8\x80\x80\x80\x80" // 1 << 21
"\xFC\x80\x80\x80\x80\x80"; // 1 << 26
auto check = [&pos, &utf8](unsigned long wanted_pos) {
std::string utf8 = "\xC0\x81" // 1 << 7
"\xE0\x80\x82" // 1 << 11
"\xF0\x80\x80\x83" // 1 << 16
"\xF8\x80\x80\x80\x84" // 1 << 21
"\xFC\x80\x80\x80\x80\x85"; // 1 << 26
auto check = [&pos, &utf8](unsigned long val, unsigned long wanted_pos) {
bool error = false;
assert(QUtil::get_next_utf8_codepoint(utf8, pos, error) == 0 && error && pos == wanted_pos);
assert(
QUtil::get_next_utf8_codepoint(utf8, pos, error) == val && error && pos == wanted_pos);
};
check(2);
check(5);
check(9);
check(14);
check(20);
check(1, 2);
check(2, 5);
check(3, 9);
check(4, 14);
check(5, 20);
}
static void
@ -361,7 +362,8 @@ check_analyze(std::string const& str, bool has8bit, bool utf8, bool utf16)
bool is_utf16 = false;
QUtil::analyze_encoding(str, has_8bit_chars, is_valid_utf8, is_utf16);
if (!((has_8bit_chars == has8bit) && (is_valid_utf8 == utf8) && (is_utf16 == utf16))) {
std::cout << "analysis failed: " << str << std::endl;
std::cout << "analysis failed: " << str << ": 8bit: " << has_8bit_chars
<< ", utf8: " << is_valid_utf8 << ", utf16: " << is_utf16 << std::endl;
}
}
@ -389,6 +391,7 @@ transcoding_test()
check_analyze("pi = \317\200", true, true, false);
check_analyze("pi != \317", true, false, false);
check_analyze("pi != 22/7", false, false, false);
check_analyze("\xE0\x80\x82", true, false, false);
check_analyze(std::string("\xfe\xff\x00\x51", 4), true, false, true);
check_analyze(std::string("\xff\xfe\x51\x00", 4), true, false, true);
std::cout << "analysis done" << std::endl;

2
qpdf/qtest/qpdf/weird-tokens-alt.json
View File

@ -16,6 +16,8 @@
"n:/OVERLONG+#c0#81",
"n:/OVERLONG+#e0#81#82",
"n:/OVERLONG+#f0#81#82#83",
"n:/range+#01",
"n:/low+#18",
"/ABCEDEF+π",
"n:/one+#a0two",
"n:/text#2fplain",

2
qpdf/qtest/qpdf/weird-tokens.json
View File

@ -16,6 +16,8 @@
"n:/OVERLONG+#c0#81",
"n:/OVERLONG+#e0#81#82",
"n:/OVERLONG+#f0#81#82#83",
"/range+\u0001",
"/low+\u0018",
"/ABCEDEF+π",
"n:/one+#a0two",
"/text/plain",

14
qpdf/qtest/qpdf/weird-tokens.pdf
View File

@ -10,6 +10,8 @@
/OVERLONG+#c0#81
/OVERLONG+#e0#81#82
/OVERLONG+#f0#81#82#83
/range+#01
/low+#18
/ABCEDEF+#cf#80
/one+#a0two
/text#2fplain
@ -83,16 +85,16 @@ xref
0 7
0000000000 65535 f
0000000025 00000 n
0000000333 00000 n
0000000415 00000 n
0000000611 00000 n
0000000710 00000 n
0000000729 00000 n
0000000361 00000 n
0000000443 00000 n
0000000639 00000 n
0000000738 00000 n
0000000757 00000 n
trailer <<
/Root 1 0 R
/Size 7
/ID [<42841c13bbf709d79a200fa1691836f8><728c020f464c3cf7e02c12605fa7d88b>]
>>
startxref
835
863
%%EOF