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ircd: Add some b64 size expression utils.

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Jason Volk 2018-04-22 14:22:34 -07:00
parent 2557834a96
commit 3badab59a5
1 changed files with 42 additions and 0 deletions
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42
include/ircd/base.h
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@ -26,18 +26,60 @@ namespace ircd
std::string b58decode(const string_view &in);
// Binary -> Base64 conversion suite
constexpr size_t b64encode_size(const size_t &);
size_t b64encode_size(const const_buffer &in);
string_view b64encode(const mutable_buffer &out, const const_buffer &in);
std::string b64encode(const const_buffer &in);
// Binary -> Base64 conversion without padding
constexpr size_t b64encode_unpadded_size(const size_t &);
size_t b64encode_unpadded_size(const const_buffer &in);
string_view b64encode_unpadded(const mutable_buffer &out, const const_buffer &in);
std::string b64encode_unpadded(const const_buffer &in);
// Base64 -> Binary conversion (padded or unpadded)
constexpr size_t b64decode_size(const size_t &);
size_t b64decode_size(const string_view &in);
const_buffer b64decode(const mutable_buffer &out, const string_view &in);
std::string b64decode(const string_view &in);
}
inline size_t
ircd::b64decode_size(const string_view &in)
{
return b64decode_size(size(in));
}
constexpr size_t
ircd::b64decode_size(const size_t &in)
{
return ceil(in * 0.75);
}
inline size_t
ircd::b64encode_unpadded_size(const const_buffer &in)
{
return b64encode_unpadded_size(size(in));
}
constexpr size_t
ircd::b64encode_unpadded_size(const size_t &in)
{
return ceil(in * (4.0 / 3.0));
}
inline size_t
ircd::b64encode_size(const const_buffer &in)
{
return b64encode_size(size(in));
}
constexpr size_t
ircd::b64encode_size(const size_t &in)
{
return ceil(in * (4.0 / 3.0)) + (3 - in % 3) % 3;
}
inline size_t
ircd::b58decode_size(const string_view &in)
{