Zig 0.17.0-dev (Split by item)

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hexToBytes

Decodes the sequence of bytes represented by the specified string of hexadecimal characters. Returns a slice of the output buffer containing the decoded bytes.

fmt.hexToBytes

pub fn hexToBytes(out: []u8, input: []const u8) ![]u8

File

lib/std/fmt.zig:1158

Code

pub fn hexToBytes(out: []u8, input: []const u8) ![]u8 {
    // Expect 0 or n pairs of hexadecimal digits.
    if (input.len & 1 != 0)
        return error.InvalidLength;
    if (out.len * 2 < input.len)
        return error.NoSpaceLeft;

    var in_i: usize = 0;
    while (in_i < input.len) : (in_i += 2) {
        const hi = try charToDigit(input[in_i], 16);
        const lo = try charToDigit(input[in_i + 1], 16);
        out[in_i / 2] = (hi << 4) | lo;
    }

    return out[0 .. in_i / 2];
}