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/** Implementation of bytea (binary string) conversions.
*
* Copyright (c) 2000-2019, Jeroen T. Vermeulen.
*
* See COPYING for copyright license. If you did not receive a file called
* COPYING with this source code, please notify the distributor of this mistake,
* or contact the author.
*/
#include "pqxx/compiler-internal.hxx"
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <new>
#include <stdexcept>
extern "C"
{
#include "libpq-fe.h"
}
#include "pqxx/binarystring"
#include "pqxx/field"
using namespace pqxx::internal;
namespace
{
using unsigned_char = unsigned char;
using buffer = std::pair<unsigned char *, size_t>;
buffer to_buffer(const void *data, size_t len)
{
void *const output{malloc(len + 1)};
if (output == nullptr) throw std::bad_alloc{};
static_cast<char *>(output)[len] = '\0';
memcpy(static_cast<char *>(output), data, len);
return buffer{static_cast<unsigned char *>(output), len};
}
buffer to_buffer(const std::string &source)
{
return to_buffer(source.c_str(), source.size());
}
buffer unescape(const unsigned char escaped[])
{
#ifdef _WIN32
/* On Windows only, the return value from PQunescapeBytea() must be freed
* using PQfreemem. Copy to a buffer allocated by libpqxx, so that the
* binarystring's buffer can be freed uniformly,
*/
size_t unescaped_len = 0;
// TODO: Use make_unique once we require C++14. Sooo much easier.
std::unique_ptr<unsigned char, void(*)(unsigned char *)> A(
PQunescapeBytea(const_cast<unsigned char *>(escaped), &unescaped_len),
freepqmem_templated<unsigned char>);
void *data = A.get();
if (data == nullptr) throw std::bad_alloc{};
return to_buffer(data, unescaped_len);
#else
/* On non-Windows platforms, it's okay to free libpq-allocated memory using
* free(). No extra copy needed.
*/
buffer unescaped;
unescaped.first = PQunescapeBytea(
const_cast<unsigned char *>(escaped), &unescaped.second);
if (unescaped.first == nullptr) throw std::bad_alloc{};
return unescaped;
#endif
}
} // namespace
pqxx::binarystring::binarystring(const field &F) :
m_buf{make_smart_pointer()},
m_size{0}
{
buffer unescaped{unescape(reinterpret_cast<const_pointer>(F.c_str()))};
m_buf = make_smart_pointer(unescaped.first);
m_size = unescaped.second;
}
pqxx::binarystring::binarystring(const std::string &s) :
m_buf{make_smart_pointer()},
m_size{s.size()}
{
m_buf = make_smart_pointer(to_buffer(s).first);
}
pqxx::binarystring::binarystring(const void *binary_data, size_t len) :
m_buf{make_smart_pointer()},
m_size{len}
{
m_buf = make_smart_pointer(to_buffer(binary_data, len).first);
}
bool pqxx::binarystring::operator==(const binarystring &rhs) const noexcept
{
if (rhs.size() != size()) return false;
return std::memcmp(data(), rhs.data(), size()) == 0;
}
pqxx::binarystring &pqxx::binarystring::operator=(const binarystring &rhs)
{
m_buf = rhs.m_buf;
m_size = rhs.m_size;
return *this;
}
pqxx::binarystring::const_reference pqxx::binarystring::at(size_type n) const
{
if (n >= m_size)
{
if (m_size == 0)
throw std::out_of_range{"Accessing empty binarystring"};
throw std::out_of_range{
"binarystring index out of range: " +
to_string(n) + " (should be below " + to_string(m_size) + ")"};
}
return data()[n];
}
void pqxx::binarystring::swap(binarystring &rhs)
{
m_buf.swap(rhs.m_buf);
// This part very obviously can't go wrong, so do it last
const auto s = m_size;
m_size = rhs.m_size;
rhs.m_size = s;
}
std::string pqxx::binarystring::str() const
{
return std::string{get(), m_size};
}
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