1 files changed, 83 insertions, 0 deletions

diff --git a/src/GenCatData.zig b/src/GenCatData.zig
new file mode 100644
index 0000000..5496e4e
--- /dev/null
+++ b/src/GenCatData.zig
@@ -0,0 +1,83 @@
+const std = @import("std");
+const builtin = @import("builtin");
+const compress = std.compress;
+const mem = std.mem;
+
+/// General Category
+pub const Gc = enum {
+    Cc,
+    Cf,
+    Cn,
+    Co,
+    Cs,
+    Ll,
+    Lm,
+    Lo,
+    Lt,
+    Lu,
+    Mc,
+    Me,
+    Mn,
+    Nd,
+    Nl,
+    No,
+    Pc,
+    Pd,
+    Pe,
+    Pf,
+    Pi,
+    Po,
+    Ps,
+    Sc,
+    Sk,
+    Sm,
+    So,
+    Zl,
+    Zp,
+    Zs,
+};
+
+allocator: mem.Allocator,
+s1: []u16 = undefined,
+s2: []u5 = undefined,
+s3: []u5 = undefined,
+
+const Self = @This();
+
+pub fn init(allocator: mem.Allocator) !Self {
+    const decompressor = compress.deflate.decompressor;
+    const in_bytes = @embedFile("gencat");
+    var in_fbs = std.io.fixedBufferStream(in_bytes);
+    var in_decomp = try decompressor(allocator, in_fbs.reader(), null);
+    defer in_decomp.deinit();
+    var reader = in_decomp.reader();
+
+    const endian = builtin.cpu.arch.endian();
+
+    var self = Self{ .allocator = allocator };
+
+    const s1_len: u16 = try reader.readInt(u16, endian);
+    self.s1 = try allocator.alloc(u16, s1_len);
+    for (0..s1_len) |i| self.s1[i] = try reader.readInt(u16, endian);
+
+    const s2_len: u16 = try reader.readInt(u16, endian);
+    self.s2 = try allocator.alloc(u5, s2_len);
+    for (0..s2_len) |i| self.s2[i] = @intCast(try reader.readInt(u8, endian));
+
+    const s3_len: u16 = try reader.readInt(u8, endian);
+    self.s3 = try allocator.alloc(u5, s3_len);
+    for (0..s3_len) |i| self.s3[i] = @intCast(try reader.readInt(u8, endian));
+
+    return self;
+}
+
+pub fn deinit(self: *Self) void {
+    self.allocator.free(self.s1);
+    self.allocator.free(self.s2);
+    self.allocator.free(self.s3);
+}
+
+/// Lookup the General Category for `cp`.
+pub inline fn gc(self: Self, cp: u21) Gc {
+    return @enumFromInt(self.s3[self.s2[self.s1[cp >> 8] + (cp & 0xff)]]);
+}