ZLIB reader for go.

R=rsc
APPROVED=rsc
DELTA=204  (204 added, 0 deleted, 0 changed)
OCL=33437
CL=33440

1 files changed, 102 insertions, 0 deletions

diff --git a/src/pkg/compress/zlib/reader_test.go b/src/pkg/compress/zlib/reader_test.go
new file mode 100644
index 000000000..f178cb5f0
--- /dev/null
+++ b/src/pkg/compress/zlib/reader_test.go
@@ -0,0 +1,102 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package zlib
+
+import (
+	"bytes";
+	"io";
+	"os";
+	"testing";
+)
+
+type zlibTest struct {
+	desc string;
+	raw string;
+	compressed []byte;
+	err os.Error;
+}
+
+// Compare-to-golden test data was generated by the ZLIB example program at
+// http://www.zlib.net/zpipe.c
+
+var zlibTests = []zlibTest {
+	zlibTest {
+		"empty",
+		"",
+		[]byte {
+			0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01,
+		},
+		nil
+	},
+	zlibTest {
+		"goodbye",
+		"goodbye, world",
+		[]byte {
+			0x78, 0x9c, 0x4b, 0xcf, 0xcf, 0x4f, 0x49, 0xaa,
+			0x4c, 0xd5, 0x51, 0x28, 0xcf, 0x2f, 0xca, 0x49,
+			0x01, 0x00, 0x28, 0xa5, 0x05, 0x5e,
+		},
+		nil
+	},
+	zlibTest {
+		"bad header",
+		"",
+		[]byte {
+			0x78, 0x9f, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01,
+		},
+		HeaderError
+	},
+	zlibTest {
+		"bad checksum",
+		"",
+		[]byte {
+			0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0xff,
+		},
+		ChecksumError,
+	},
+	zlibTest {
+		"not enough data",
+		"",
+		[]byte {
+			0x78, 0x9c, 0x03, 0x00, 0x00, 0x00,
+		},
+		io.ErrUnexpectedEOF,
+	},
+	zlibTest {
+		"excess data is silently ignored",
+		"",
+		[]byte {
+			0x78, 0x9c, 0x03, 0x00, 0x00, 0x00, 0x00, 0x01,
+			0x78, 0x9c, 0xff,
+		},
+		nil,
+	},
+}
+
+func TestZlibInflater(t *testing.T) {
+	b := new(bytes.Buffer);
+	for i, tt := range zlibTests {
+		in := io.NewByteReader(tt.compressed);
+		zlib, err := NewZlibInflater(in);
+		if err != nil {
+			if err != tt.err {
+				t.Errorf("%s: NewZlibInflater: %s", tt.desc, err);
+			}
+			continue;
+		}
+		b.Reset();
+		n, err := io.Copy(zlib, b);
+		if err != nil {
+			if err != tt.err {
+				t.Errorf("%s: io.Copy: %v want %v", tt.desc, err, tt.err);
+			}
+			continue;
+		}
+		s := string(b.Data());
+		if s != tt.raw {
+			t.Errorf("%s: got %d-byte %q want %d-byte %q", tt.desc, n, s, len(tt.raw), tt.raw);
+		}
+	}
+}