init
Function parameters
Parameters
- alphabet_chars:[64]u8
- pad_char:?u8
Base64 codecs
Types
- Codecs
- Base64 codecs
Error sets in this namespace
Error Sets
The Base64 alphabet defined in
Values
- standard_alphabet_chars
- The Base64 alphabet defined in
- standard
- Standard Base64 codecs, with padding, as defined in
- standard_no_pad
- Standard Base64 codecs, without padding, as defined in
- url_safe_alphabet_chars
- The URL-safe Base64 alphabet defined in
- url_safe
- URL-safe Base64 codecs, with padding, as defined in
- url_safe_no_pad
- URL-safe Base64 codecs, without padding, as defined in
Source
Implementation
pub fn init(alphabet_chars: [64]u8, pad_char: ?u8) Base64Decoder {
var result = Base64Decoder{
.char_to_index = [_]u8{invalid_char} ** 256,
.fast_char_to_index = .{[_]u32{invalid_char_tst} ** 256} ** 4,
.pad_char = pad_char,
};
var char_in_alphabet = [_]bool{false} ** 256;
for (alphabet_chars, 0..) |c, i| {
assert(!char_in_alphabet[c]);
assert(pad_char == null or c != pad_char.?);
const ci = @as(u32, @intCast(i));
result.fast_char_to_index[0][c] = ci << 2;
result.fast_char_to_index[1][c] = (ci >> 4) | ((ci & 0x0f) << 12);
result.fast_char_to_index[2][c] = ((ci & 0x3) << 22) | ((ci & 0x3c) << 6);
result.fast_char_to_index[3][c] = ci << 16;
result.char_to_index[c] = @as(u8, @intCast(i));
char_in_alphabet[c] = true;
}
return result;
}