Merge pull request #3 from oschwald/greg/perf-improvements

Small performance improvements

Author: marselester

src/decoder.zig

@@ -191,10 +191,12 @@ pub const Decoder = struct {
                     const Value = std.meta.FieldType(DecodedType.KV, .value);
                     var map = DecodedType.init(allocator);
                     const map_len = field.size;
+                    try map.ensureTotalCapacity(@intCast(map_len));
+
                     for (0..map_len) |_| {
                         const key = try self.decodeValue(allocator, Key);
                         const value = try self.decodeValue(allocator, Value);
-                        try map.put(key, value);
+                        map.putAssumeCapacity(key, value);
                     }
 
                     return map;

src/geoip2.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 
-pub const Names = std.hash_map.StringHashMap([]const u8);
+pub const Names = std.StringArrayHashMap([]const u8);
 
 /// Country represents a record in the GeoIP2-Country database, for example,
 /// https://github.com/maxmind/MaxMind-DB/blob/main/source-data/GeoIP2-Country-Test.json.

src/geolite2.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 
-pub const Names = std.hash_map.StringHashMap([]const u8);
+pub const Names = std.StringArrayHashMap([]const u8);
 
 /// Country represents a record in the GeoLite2-Country database, for example,
 /// https://github.com/maxmind/MaxMind-DB/blob/main/source-data/GeoLite2-Country-Test.json.

src/reader.zig

@@ -20,7 +20,7 @@ pub const Metadata = struct {
     binary_format_minor_version: u16 = 0,
     build_epoch: u64 = 0,
     database_type: []const u8 = "",
-    description: ?std.hash_map.StringHashMap([]const u8) = null,
+    description: ?std.StringArrayHashMap([]const u8) = null,
     ip_version: u16 = 0,
     languages: ?std.ArrayList([]const u8) = null,
     node_count: u32 = 0,