Source
pub fn parse(allocator: std.mem.Allocator, reader: anytype) !Tz {
var legacy_header = try reader.readStruct(Header);
if (!std.mem.eql(u8, &legacy_header.magic, "TZif")) return error.BadHeader;
if (legacy_header.version != 0 and legacy_header.version != '2' and legacy_header.version != '3') return error.BadVersion;
if (builtin.target.cpu.arch.endian() != std.builtin.Endian.big) {
std.mem.byteSwapAllFields(@TypeOf(legacy_header.counts), &legacy_header.counts);
}
if (legacy_header.version == 0) {
return parseBlock(allocator, reader, legacy_header, true);
} else {
// If the format is modern, just skip over the legacy data
const skipv = legacy_header.counts.timecnt * 5 + legacy_header.counts.typecnt * 6 + legacy_header.counts.charcnt + legacy_header.counts.leapcnt * 8 + legacy_header.counts.isstdcnt + legacy_header.counts.isutcnt;
try reader.skipBytes(skipv, .{});
var header = try reader.readStruct(Header);
if (!std.mem.eql(u8, &header.magic, "TZif")) return error.BadHeader;
if (header.version != '2' and header.version != '3') return error.BadVersion;
if (builtin.target.cpu.arch.endian() != std.builtin.Endian.big) {
std.mem.byteSwapAllFields(@TypeOf(header.counts), &header.counts);
}
return parseBlock(allocator, reader, header, false);
}
}