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Code Issues Releases Wiki Activity

Fix asymmetry between newUnicodeString and getUTF8Value

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This commit is contained in:
Jay Berkenbilt 2022-02-15 19:22:35 -05:00
parent e35abe2fb7
commit e810fe678a
3 changed files with 30 additions and 4 deletions
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5
ChangeLog
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@ -1,5 +1,10 @@
2022-02-15 Jay Berkenbilt <ejb@ql.org>
* Fix asymmetrical logic between
QPDFObjectHandle::newUnicodeString() and
QPDFObjectHandle::getUTF8Val(). The asymmetrical logic didn't
matter before fixing the PDF Doc transcoding bugs.
* When analyzing PDF strings, recognize UTF-16LE as UTF-16. The
PDF spec only allows UTF-16BE, but most readers seem to allow
both. Fixes #649.

3
libqpdf/QPDF_String.cc
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@ -32,8 +32,7 @@ QPDF_String*
QPDF_String::new_utf16(std::string const& utf8_val)
{
std::string result;
if (! (QUtil::utf8_to_ascii(utf8_val, result, '?') ||
QUtil::utf8_to_pdf_doc(utf8_val, result, '?')))
if (! QUtil::utf8_to_pdf_doc(utf8_val, result, '?'))
{
result = QUtil::utf8_to_utf16(utf8_val);
}

26
qpdf/test_driver.cc
View File

@ -3325,12 +3325,34 @@ static void test_85(QPDF& pdf, char const* arg2)
assert(s == "/Test");
}
static void test_86(QPDF& pdf, char const* arg2)
{
// Test symmetry between newUnicodeString and getUTF8Value for
// strings that can't be encoded as PDFDoc but don't contain any
// high code points.
std::string utf8_val("\x1f");
std::string utf16_val("\xfe\xff\x00\x1f", 4);
std::string result;
assert(QUtil::utf8_to_ascii(utf8_val, result, '?'));
assert(result == "\x1f");
assert(! QUtil::utf8_to_pdf_doc(utf8_val, result, '?'));
assert(result == "?");
assert(QUtil::utf8_to_utf16(utf8_val) == utf16_val);
assert(QUtil::utf16_to_utf8(utf16_val) == utf8_val);
auto h = QPDFObjectHandle::newUnicodeString("\x1f");
assert(h.getStringValue() == std::string("\xfe\xff\x00\x1f", 4));
assert(h.getUTF8Value() == "\x1f");
}
void runtest(int n, char const* filename1, char const* arg2)
{
// Most tests here are crafted to work on specific files. Look at
// the test suite to see how the test is invoked to find the file
// that the test is supposed to operate on.
std::set<int> ignore_filename = {61, 81, 83, 84, 85, 86};
if (n == 0)
{
// Throw in some random test cases that don't fit anywhere
@ -3391,7 +3413,7 @@ void runtest(int n, char const* filename1, char const* arg2)
pdf.processMemoryFile((std::string(filename1) + ".pdf").c_str(),
p, size);
}
else if ((n == 61) || (n == 81) || (n == 83) || (n == 84) || (n == 85))
else if (ignore_filename.count(n))
{
// Ignore filename argument entirely
}
@ -3439,7 +3461,7 @@ void runtest(int n, char const* filename1, char const* arg2)
{72, test_72}, {73, test_73}, {74, test_74}, {75, test_75},
{76, test_76}, {77, test_77}, {78, test_78}, {79, test_79},
{80, test_80}, {81, test_81}, {82, test_82}, {83, test_83},
{84, test_84}, {85, test_85},
{84, test_84}, {85, test_85}, {86, test_86},
};
auto fn = test_functions.find(n);