mirror of
https://github.com/oven-sh/bun
synced 2026-02-10 10:58:56 +00:00
113 lines
3.6 KiB
Zig
113 lines
3.6 KiB
Zig
//https://github.com/dmgk/zig-uuid
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const std = @import("std");
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const crypto = std.crypto;
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const fmt = std.fmt;
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const testing = std.testing;
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pub const Error = error{InvalidUUID};
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const UUID = @This();
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bytes: [16]u8,
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pub fn init() UUID {
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var uuid = UUID{ .bytes = undefined };
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crypto.random.bytes(&uuid.bytes);
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// Version 4
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uuid.bytes[6] = (uuid.bytes[6] & 0x0f) | 0x40;
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// Variant 1
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uuid.bytes[8] = (uuid.bytes[8] & 0x3f) | 0x80;
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return uuid;
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}
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// Indices in the UUID string representation for each byte.
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const encoded_pos = [16]u8{ 0, 2, 4, 6, 9, 11, 14, 16, 19, 21, 24, 26, 28, 30, 32, 34 };
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// Hex to nibble mapping.
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const hex_to_nibble = [256]u8{
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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};
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pub fn format(
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self: UUID,
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comptime layout: []const u8,
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options: fmt.FormatOptions,
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writer: anytype,
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) !void {
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_ = options; // currently unused
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if (layout.len != 0 and layout[0] != 's')
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@compileError("Unsupported format specifier for UUID type: '" ++ layout ++ "'.");
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var buf: [36]u8 = undefined;
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const hex = "0123456789abcdef";
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buf[8] = '-';
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buf[13] = '-';
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buf[18] = '-';
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buf[23] = '-';
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inline for (encoded_pos) |i, j| {
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buf[i + 0] = hex[self.bytes[j] >> 4];
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buf[i + 1] = hex[self.bytes[j] & 0x0f];
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}
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try fmt.format(writer, "{s}", .{buf});
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}
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pub fn parse(buf: []const u8) Error!UUID {
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var uuid = UUID{ .bytes = undefined };
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if (buf.len != 36 or buf[8] != '-' or buf[13] != '-' or buf[18] != '-' or buf[23] != '-')
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return Error.InvalidUUID;
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inline for (encoded_pos) |i, j| {
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const hi = hex_to_nibble[buf[i + 0]];
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const lo = hex_to_nibble[buf[i + 1]];
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if (hi == 0xff or lo == 0xff) {
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return Error.InvalidUUID;
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}
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uuid.bytes[j] = hi << 4 | lo;
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}
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return uuid;
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}
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// Zero UUID
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pub const zero: UUID = .{ .bytes = .{0} ** 16 };
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// Convenience function to return a new v4 UUID.
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pub fn newV4() UUID {
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return UUID.init();
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}
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