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Clean up borrowed base64 code to match repo standards

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This commit is contained in:
kannibalox
2024-11-02 12:14:22 -04:00
committed by Jari Sundell
parent 902de0b258
commit e355eb561f
1 changed files with 10 additions and 6 deletions
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src/utils/base64.h
+10 -6
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@@ -3,22 +3,26 @@
#include <torrent/exceptions.h>
namespace utils {
constexpr static char padCharacter = '=';
// Modified from the public domain code in
// https://en.wikibooks.org/wiki/Algorithm_Implementation/Miscellaneous/Base64#C++_2
constexpr char base64_pad_character = '=';
static std::string
base64decode(const std::string& input) {
if (input.length() % 4) // Sanity check
throw torrent::input_error("Invalid base64.");
size_t padding = 0;
if (input.length()) {
if (input[input.length() - 1] == padCharacter)
if (input[input.length() - 1] == base64_pad_character)
padding++;
if (input[input.length() - 2] == padCharacter)
if (input[input.length() - 2] == base64_pad_character)
padding++;
}
// Setup a vector to hold the result
std::string decodedBytes;
decodedBytes.reserve(((input.length() / 4) * 3) - padding);
long temp = 0; // Holds decoded quanta
long temp = 0; // Holds decoded quanta
std::string::const_iterator cursor = input.begin();
while (cursor < input.end()) {
for (size_t quantumPosition = 0; quantumPosition < 4; quantumPosition++) {
@@ -32,8 +36,8 @@ base64decode(const std::string& input) {
else if (*cursor == 0x2B)
temp |= 0x3E; // change to 0x2D for URL alphabet
else if (*cursor == 0x2F)
temp |= 0x3F; // change to 0x5F for URL alphabet
else if (*cursor == padCharacter) // pad
temp |= 0x3F; // change to 0x5F for URL alphabet
else if (*cursor == base64_pad_character) // pad
{
switch (input.end() - cursor) {
case 1: // One pad character