sek1ro/libbasen
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

fix(baseN): sizeEnc/Dec: zeros counting

Browse Source
This commit is contained in:
SEK1RO
2024-09-19 07:54:46 +03:00
parent 817f6c4fb1
commit f49c0463d4
4 changed files with 31 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
src/baseN.cpp
View File

@ -20,15 +20,21 @@ namespace baseN
}
uint64_t sizeEncoded(std::span<const uint8_t> data, uint8_t base)
{
if (data.size() > std::numeric_limits<uint64_t>::max() / log256)
std::span<const uint8_t> dv(std::find_if(data.begin(), data.end(), [](uint8_t item)
{ return item != 0; }),
data.end());
if (dv.size() > std::numeric_limits<uint64_t>::max() / log256)
{
throw std::overflow_error("baseN::sizeEncoded: overflow");
}
return data.size() * log256 / std::log(base) + 1;
return dv.size() * log256 / std::log(base) + 1 + (data.size() - dv.size());
}
uint64_t sizeDecoded(std::string_view str, uint8_t base) noexcept
uint64_t sizeDecoded(std::string_view str, uint8_t base, const char *digits) noexcept
{
return str.size() * std::log(base) / log256 + 1;
std::string_view sv(std::find_if(str.begin(), str.end(), [digits](uint8_t ch)
{ return ch != digits[0]; }),
str.end());
return sv.size() * std::log(base) / log256 + 1 + (str.size() - sv.size());
}
void encode(const uint8_t *data, uint64_t data_size, char *str, uint64_t str_size, uint8_t base, const char *digits)
{
@ -119,7 +125,7 @@ namespace baseN
}
std::vector<uint8_t> decode(std::string_view str, uint8_t base, const char *digits, const int8_t *map) noexcept
{
std::vector<uint8_t> data(baseN::sizeDecoded(str, base));
std::vector<uint8_t> data(baseN::sizeDecoded(str, base, digits));
baseN::decode(str.data(), str.size(), data.data(), data.size(), base, digits, map);
data.erase(data.begin(), std::find_if(data.begin(), data.end(), [](uint8_t item)
{ return item != 0; }));