// SPDX-FileCopyrightText: © 2026 Jeffrey C. Ollie
// SPDX-License-Identifier: MIT

const std = @import("std");

const OSMPBF = @import("proto/OSMPBF.pb.zig");

pub fn dupe(alloc: std.mem.Allocator, block: *const OSMPBF.PrimitiveBlock, index_: ?u32) !?[]const u8 {
    const string = try lookup(block, index_) orelse return null;
    return try alloc.dupe(u8, string);
}

pub fn lookup(block: *const OSMPBF.PrimitiveBlock, index_: ?u32) !?[]const u8 {
    const index = index_ orelse return null;
    const stringtable = (block.stringtable orelse return null).s.items;
    if (index >= stringtable.len) return error.StringIndexOutOfRange;
    return stringtable[@intCast(index)];
}