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Don't assume char is signed in int conversion tests (fixes #361)

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This commit is contained in:
Jay Berkenbilt 2019-09-17 12:13:19 -04:00
parent 8c34d67b88
commit 6d81f01476
4 changed files with 21 additions and 5 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2019-09-17 Jay Berkenbilt <ejb@ql.org>
* QIntC tests: don't assume char is signed. Fixes #361.
2019-08-31 Jay Berkenbilt <ejb@ql.org>
* 9.0.0: release

7
include/qpdf/QIntC.hh
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@ -50,6 +50,13 @@ namespace QIntC // QIntC = qpdf Integer Conversion
typedef unsigned char type;
};
template <>
class to_u<signed char>
{
public:
typedef unsigned char type;
};
template <>
class to_u<short>
{

11
libtests/qintc.cc
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@ -32,12 +32,13 @@ int main()
uint64_t ul1 = 1099511627776LL; // Too big for 32-bit
uint64_t ul2 = 12345; // Fits into 32-bit
int32_t i2 = 81; // Fits in char and uchar
char c1 = '\xf7'; // Signed value when char
signed char c1 = static_cast<signed char>('\xf7'); // Signed value when char
char c2 = 'W'; // char; may be signed or unsigned
// Verify i1 and u1 have same bit pattern
assert(static_cast<uint32_t>(i1) == u1);
// Verify that we can unsafely convert between char and unsigned char
assert(c1 == static_cast<char>(static_cast<unsigned char>(c1)));
// Verify that we can unsafely convert between signed and unsigned char
assert(c1 == static_cast<signed char>(static_cast<unsigned char>(c1)));
try_convert(true, QIntC::to_int<int32_t>, i1);
try_convert(true, QIntC::to_uint<uint32_t>, u1);
@ -51,7 +52,9 @@ int main()
try_convert(false, QIntC::to_ulonglong<int32_t>, i1);
try_convert(true, QIntC::to_char<int32_t>, i2);
try_convert(true, QIntC::to_uchar<int32_t>, i2);
try_convert(false, QIntC::to_uchar<char>, c1);
try_convert(false, QIntC::to_uchar<signed char>, c1);
try_convert(true, QIntC::to_uchar<char>, c2);
try_convert(true, QIntC::to_char<char>, c2);
return 0;
}

4
libtests/qtest/qintc/qintc.out
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@ -10,4 +10,6 @@ QIntC::to_offset<int32_t>(i1): -1153374643 -1153374643 PASSED
QIntC::to_ulonglong<int32_t>(i1): integer out of range converting -1153374643 from a 4-byte signed type to a 8-byte unsigned type PASSED
QIntC::to_char<int32_t>(i2): 81 Q PASSED
QIntC::to_uchar<int32_t>(i2): 81 Q PASSED
QIntC::to_uchar<char>(c1): integer out of range converting ÷ from a 1-byte signed type to a 1-byte unsigned type PASSED
QIntC::to_uchar<signed char>(c1): integer out of range converting ÷ from a 1-byte signed type to a 1-byte unsigned type PASSED
QIntC::to_uchar<char>(c2): W W PASSED
QIntC::to_char<char>(c2): W W PASSED