Util.hh
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#ifndef UTIL_HH
#define UTIL_HH
#include <qpdf/assert_debug.h>
#include <stdexcept>
#include <string>
#include <utility>
using namespace std::literals;
namespace qpdf::util
{
// qpdf::util is a collection of useful utility functions for qpdf internal use. It includes
// inline functions, some of which are exposed as regular functions in QUtil. Implementations
// are in QUtil.cc.
// Throw a logic_error if 'cond' does not hold.
//
// DO NOT USE unless it is impractical or unnecessary to cover violations during CI Testing.
template <typename T>
inline void
assertion(bool cond, T&& msg)
{
if (!cond) {
throw std::logic_error(std::forward<T>(msg));
}
}
template <typename T>
inline void
internal_error_if(bool cond, T&& msg)
{
if (cond) {
throw std::logic_error("INTERNAL ERROR: "s.append(std::forward<T>(msg))
.append(
"\nThis is a qpdf bug. Please report at "
"https://github.com/qpdf/qpdf/issues"));
}
}
template <typename T>
inline void
no_ci_rt_error_if(bool cond, T&& msg)
{
if (cond) {
throw std::runtime_error(std::forward<T>(msg));
}
}
inline constexpr char
hex_decode_char(char digit)
{
return digit <= '9' && digit >= '0'
? char(digit - '0')
: (digit >= 'a' ? char(digit - 'a' + 10)
: (digit >= 'A' ? char(digit - 'A' + 10) : '\20'));
}
inline constexpr bool
is_hex_digit(char ch)
{
return hex_decode_char(ch) < '\20';
}
inline constexpr bool
is_space(char ch)
{
return ch == ' ' || ch == '\n' || ch == '\r' || ch == '\t' || ch == '\f' || ch == '\v';
}
inline bool
is_digit(char ch)
{
return (ch >= '0' && ch <= '9');
}
// Returns lower-case hex-encoded version of the char including a leading "#".
inline std::string
hex_encode_char(char c)
{
static auto constexpr hexchars = "0123456789abcdef";
return {'#', hexchars[static_cast<unsigned char>(c) >> 4], hexchars[c & 0x0f]};
}
// Numerically increment a digit string. Ignore the last 'tail' characters.
inline void
increment(std::string& s, int tail = 0)
{
auto end = s.rend();
for (auto it = s.rbegin() + tail; it != end; ++it) {
++*it;
if (*it != ':') {
return;
}
*it = '0';
}
s.insert(0, 1, '1');
}
inline bool
is_utf16(std::string const& str)
{
return str.starts_with("\xfe\xff") || str.starts_with("\xff\xfe");
}
inline bool
is_explicit_utf8(std::string const& str)
{
// QPDF_String.cc knows that this is a 3-byte sequence.
return str.starts_with("\xef\xbb\xbf");
}
std::string random_string(size_t len);
} // namespace qpdf::util
#endif // UTIL_HH