New safe type converters in QIntC

1 files changed, 57 insertions, 0 deletions

diff --git a/libtests/qintc.cc b/libtests/qintc.cc
new file mode 100644
index 00000000..79fc6f53
--- /dev/null
+++ b/libtests/qintc.cc
@@ -0,0 +1,57 @@
+#include <qpdf/QIntC.hh>
+#include <stdint.h>
+#include <cassert>
+
+#define try_convert(exp_pass, fn, i) \
+    try_convert_real(#fn "(" #i ")", exp_pass, fn, i)
+
+template <typename From, typename To>
+static void try_convert_real(
+    char const* description, bool exp_pass,
+    To (*fn)(From const&), From const& i)
+{
+    bool passed = false;
+    try
+    {
+        To result = fn(i);
+        passed = true;
+        std::cout << description << ": " << i << " " << result;
+    }
+    catch (std::range_error& e)
+    {
+        std::cout << description << ": " << e.what();
+        passed = false;
+    }
+    std::cout << ((passed == exp_pass) ? " PASSED" : " FAILED") << std::endl;
+}
+
+int main()
+{
+    uint32_t u1 = 3141592653U;      // Too big for signed type
+    int32_t i1 = -1153374643;       // Same bit pattern as u1
+    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 vaule when char
+
+    // 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)));
+
+    try_convert(true,  QIntC::to_int<int32_t>, i1);
+    try_convert(true,  QIntC::to_uint<uint32_t>, u1);
+    try_convert(false, QIntC::to_int<uint32_t>, u1);
+    try_convert(false, QIntC::to_uint<int32_t>, i1);
+    try_convert(false, QIntC::to_int<uint64_t>, ul1);
+    try_convert(true,  QIntC::to_int<uint64_t>, ul2);
+    try_convert(true,  QIntC::to_uint<uint64_t>, ul2);
+    try_convert(true,  QIntC::to_offset<uint32_t>, u1);
+    try_convert(true,  QIntC::to_offset<int32_t>, i1);
+    try_convert(false, QIntC::to_size<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);
+
+    return 0;
+}