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Add utility functions for big-endian int storage

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Use instead of htonl().
This commit is contained in:
Andrew Ayer
2014-03-22 11:41:18 -07:00
parent 73bf395b3b
commit 2f02161042
3 changed files with 42 additions and 4 deletions
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34
util.cpp
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@@ -126,3 +126,37 @@ std::string escape_shell_arg (const std::string& str)
return new_str;
}
uint32_t load_be32 (const unsigned char* p)
{
return (static_cast<uint32_t>(p[3]) << 0) |
(static_cast<uint32_t>(p[2]) << 8) |
(static_cast<uint32_t>(p[1]) << 16) |
(static_cast<uint32_t>(p[0]) << 24);
}
void store_be32 (unsigned char* p, uint32_t i)
{
p[3] = i; i >>= 8;
p[2] = i; i >>= 8;
p[1] = i; i >>= 8;
p[0] = i;
}
bool read_be32 (std::istream& in, uint32_t& i)
{
unsigned char buffer[4];
in.read(reinterpret_cast<char*>(buffer), 4);
if (in.gcount() != 4) {
return false;
}
i = load_be32(buffer);
return true;
}
void write_be32 (std::ostream& out, uint32_t i)
{
unsigned char buffer[4];
store_be32(buffer, i);
out.write(reinterpret_cast<const char*>(buffer), 4);
}