Function percentDecodeBackwards [src]

Percent decodes all %XX where XX is a valid hex number. output may alias input if output.ptr <= input.ptr. Mutates and returns a subslice of output.

Prototype

pub fn percentDecodeBackwards(output: []u8, input: []const u8) []u8

Parameters

output: []u8input: []const u8

Source

  pub fn percentDecodeBackwards(output: []u8, input: []const u8) []u8 {
    var input_index = input.len;
    var output_index = output.len;
    while (input_index > 0) {
        if (input_index >= 3) {
            const maybe_percent_encoded = input[input_index - 3 ..][0..3];
            if (maybe_percent_encoded[0] == '%') {
                if (std.fmt.parseInt(u8, maybe_percent_encoded[1..], 16)) |percent_encoded_char| {
                    input_index -= maybe_percent_encoded.len;
                    output_index -= 1;
                    output[output_index] = percent_encoded_char;
                    continue;
                } else |_| {}
            }
        }
        input_index -= 1;
        output_index -= 1;
        output[output_index] = input[input_index];
    }
    return output[output_index..];
}  