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refactor gzip test cases

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zig newbies love using for loops in unit tests
This commit is contained in:
Andrew Kelley 2025-07-28 16:53:01 -07:00
parent e73ca2444e
commit 5f571f53d6
1 changed files with 47 additions and 57 deletions
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104
lib/std/compress/flate/Decompress.zig
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@ -864,7 +864,7 @@ test "dynamic block (type 2)" {
fn testBasicCase(in: []const u8, out: []const u8) !void {
var reader: Reader = .fixed(in);
var aw: Writer.Allocating = .init(testing.allocator);
try aw.ensureUnusedCapacity(flate.history_len + 1);
try aw.ensureUnusedCapacity(flate.history_len);
defer aw.deinit();
var decompress: Decompress = .init(&reader, .raw, &.{});
@ -873,63 +873,53 @@ fn testBasicCase(in: []const u8, out: []const u8) !void {
try testing.expectEqualStrings(out, aw.getWritten());
}
test "gzip decompress" {
const cases = [_]struct {
in: []const u8,
out: []const u8,
}{
// non compressed block (type 0)
.{
.in = &[_]u8{
0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, // gzip header (10 bytes)
0b0000_0001, 0b0000_1100, 0x00, 0b1111_0011, 0xff, // deflate fixed buffer header len, nlen
'H', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', 0x0a, // non compressed data
0xd5, 0xe0, 0x39, 0xb7, // gzip footer: checksum
0x0c, 0x00, 0x00, 0x00, // gzip footer: size
},
.out = "Hello world\n",
},
// fixed code block (type 1)
.{
.in = &[_]u8{
0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x03, // gzip header (10 bytes)
0xf3, 0x48, 0xcd, 0xc9, 0xc9, 0x57, 0x28, 0xcf, // deflate data block type 1
0x2f, 0xca, 0x49, 0xe1, 0x02, 0x00,
0xd5, 0xe0, 0x39, 0xb7, 0x0c, 0x00, 0x00, 0x00, // gzip footer (chksum, len)
},
.out = "Hello world\n",
},
// dynamic block (type 2)
.{
.in = &[_]u8{
0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, // gzip header (10 bytes)
0x3d, 0xc6, 0x39, 0x11, 0x00, 0x00, 0x0c, 0x02, // deflate data block type 2
0x30, 0x2b, 0xb5, 0x52, 0x1e, 0xff, 0x96, 0x38,
0x16, 0x96, 0x5c, 0x1e, 0x94, 0xcb, 0x6d, 0x01,
0x17, 0x1c, 0x39, 0xb4, 0x13, 0x00, 0x00, 0x00, // gzip footer (chksum, len)
},
.out = "ABCDEABCD ABCDEABCD",
},
// gzip header with name
.{
.in = &[_]u8{
0x1f, 0x8b, 0x08, 0x08, 0xe5, 0x70, 0xb1, 0x65, 0x00, 0x03, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2e,
0x74, 0x78, 0x74, 0x00, 0xf3, 0x48, 0xcd, 0xc9, 0xc9, 0x57, 0x28, 0xcf, 0x2f, 0xca, 0x49, 0xe1,
0x02, 0x00, 0xd5, 0xe0, 0x39, 0xb7, 0x0c, 0x00, 0x00, 0x00,
},
.out = "Hello world\n",
},
};
for (cases) |c| {
var fb: Reader = .fixed(c.in);
var aw: Writer.Allocating = .init(testing.allocator);
defer aw.deinit();
test "gzip non compressed block (type 0)" {
try testGzipDecompress(&[_]u8{
0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, // gzip header (10 bytes)
0b0000_0001, 0b0000_1100, 0x00, 0b1111_0011, 0xff, // deflate fixed buffer header len, nlen
'H', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd', 0x0a, // non compressed data
0xd5, 0xe0, 0x39, 0xb7, // gzip footer: checksum
0x0c, 0x00, 0x00, 0x00, // gzip footer: size
}, "Hello world\n");
}
var decompress: Decompress = .init(&fb, .gzip, &.{});
const r = &decompress.reader;
_ = try r.streamRemaining(&aw.writer);
try testing.expectEqualStrings(c.out, aw.getWritten());
}
test "gzip fixed code block (type 1)" {
try testGzipDecompress(&[_]u8{
0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x03, // gzip header (10 bytes)
0xf3, 0x48, 0xcd, 0xc9, 0xc9, 0x57, 0x28, 0xcf, // deflate data block type 1
0x2f, 0xca, 0x49, 0xe1, 0x02, 0x00,
0xd5, 0xe0, 0x39, 0xb7, 0x0c, 0x00, 0x00, 0x00, // gzip footer (chksum, len)
}, "Hello world\n");
}
test "gzip dynamic block (type 2)" {
try testGzipDecompress(&[_]u8{
0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, // gzip header (10 bytes)
0x3d, 0xc6, 0x39, 0x11, 0x00, 0x00, 0x0c, 0x02, // deflate data block type 2
0x30, 0x2b, 0xb5, 0x52, 0x1e, 0xff, 0x96, 0x38,
0x16, 0x96, 0x5c, 0x1e, 0x94, 0xcb, 0x6d, 0x01,
0x17, 0x1c, 0x39, 0xb4, 0x13, 0x00, 0x00, 0x00, // gzip footer (chksum, len)
}, "ABCDEABCD ABCDEABCD");
}
test "gzip header with name" {
try testGzipDecompress(&[_]u8{
0x1f, 0x8b, 0x08, 0x08, 0xe5, 0x70, 0xb1, 0x65, 0x00, 0x03, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2e,
0x74, 0x78, 0x74, 0x00, 0xf3, 0x48, 0xcd, 0xc9, 0xc9, 0x57, 0x28, 0xcf, 0x2f, 0xca, 0x49, 0xe1,
0x02, 0x00, 0xd5, 0xe0, 0x39, 0xb7, 0x0c, 0x00, 0x00, 0x00,
}, "Hello world\n");
}
fn testGzipDecompress(in: []const u8, out: []const u8) !void {
var reader: Reader = .fixed(in);
var aw: Writer.Allocating = .init(testing.allocator);
try aw.ensureUnusedCapacity(flate.history_len);
defer aw.deinit();
var decompress: Decompress = .init(&reader, .gzip, &.{});
const r = &decompress.reader;
_ = try r.streamRemaining(&aw.writer);
try testing.expectEqualStrings(out, aw.getWritten());
}
test "zlib decompress" {