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std/fmt/index.zig: add hexToBytes function under std.fmt; 

Depends on #1454 being implemented;
master
kristopher tate 2018-09-02 18:02:24 +09:00
parent 86e55567b4
commit fbd9bac5e7
1 changed files with 20 additions and 0 deletions
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20
std/fmt/index.zig
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@ -1331,3 +1331,23 @@ pub fn isWhiteSpace(byte: u8) bool {
else => false,
};
}
// depends on https://github.com/ziglang/zig/pull/1454
pub fn hexToBytes(input: []const u8, out: []u8) !void {
if (out.len * 2 < input.len)
return error.InvalidLength;
var i: usize = 0;
while (i < input.len) : (i += 2) {
out[i/2] = (try charToDigit(input[i], 36)) << 4;
out[i/2] += try charToDigit(input[i+1], 36);
}
}
test "fmt.hexToBytes" {
const test_hex_str = "909A312BB12ED1F819B3521AC4C1E896F2160507FFC1C8381E3B07BB16BD1706";
var pb: [32]u8 = undefined;
try hexToBytes(test_hex_str, pb[0..]);
try testFmt(test_hex_str, "{X}", pb);
}