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1 747 jeremybenn 
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This test tests some internals of the flate package.
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// The tests in package compress/gzip serve as the
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// end-to-end test of the decompressor.
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package flate
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import (
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        "bytes"
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        "reflect"
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        "testing"
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)
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// The Huffman code lengths used by the fixed-format Huffman blocks.
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var fixedHuffmanBits = [...]int{
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        // 0-143 length 8
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        8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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        8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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        8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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        8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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        8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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        8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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        8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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        8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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        8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
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        // 144-255 length 9
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        9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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        9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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        9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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        9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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        9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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        9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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        9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
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        // 256-279 length 7
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        7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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        7, 7, 7, 7, 7, 7, 7, 7,
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        // 280-287 length 8
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        8, 8, 8, 8, 8, 8, 8, 8,
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}
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type InitDecoderTest struct {
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        in  []int
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        out huffmanDecoder
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        ok  bool
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}
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var initDecoderTests = []*InitDecoderTest{
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        // Example from Connell 1973,
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        {
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                []int{3, 5, 2, 4, 3, 5, 5, 4, 4, 3, 4, 5},
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                huffmanDecoder{
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                        2, 5,
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                        [maxCodeLen + 1]int{2: 0, 4, 13, 31},
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                        [maxCodeLen + 1]int{2: 0, 1, 6, 20},
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                        // Paper used different code assignment:
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                        // 2, 9, 4, 0, 10, 8, 3, 7, 1, 5, 11, 6
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                        // Reordered here so that codes of same length
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                        // are assigned to increasing numbers.
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                        []int{2, 0, 4, 9, 3, 7, 8, 10, 1, 5, 6, 11},
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                },
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                true,
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        },
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        // Example from RFC 1951 section 3.2.2
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        {
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                []int{2, 1, 3, 3},
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                huffmanDecoder{
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                        1, 3,
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                        [maxCodeLen + 1]int{1: 0, 2, 7},
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                        [maxCodeLen + 1]int{1: 0, 1, 4},
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                        []int{1, 0, 2, 3},
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                },
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                true,
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        },
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        // Second example from RFC 1951 section 3.2.2
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        {
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                []int{3, 3, 3, 3, 3, 2, 4, 4},
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                huffmanDecoder{
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                        2, 4,
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                        [maxCodeLen + 1]int{2: 0, 6, 15},
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                        [maxCodeLen + 1]int{2: 0, 1, 8},
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                        []int{5, 0, 1, 2, 3, 4, 6, 7},
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                },
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                true,
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        },
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        // Static Huffman codes (RFC 1951 section 3.2.6)
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        {
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                fixedHuffmanBits[0:],
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                fixedHuffmanDecoder,
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                true,
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        },
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        // Illegal input.
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        {
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                []int{},
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                huffmanDecoder{},
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                false,
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        },
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        // Illegal input.
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        {
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                []int{0, 0, 0, 0, 0, 0, 0},
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                huffmanDecoder{},
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                false,
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        },
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}
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func TestInitDecoder(t *testing.T) {
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        for i, tt := range initDecoderTests {
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                var h huffmanDecoder
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                if h.init(tt.in) != tt.ok {
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                        t.Errorf("test %d: init = %v", i, !tt.ok)
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                        continue
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                }
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                if !reflect.DeepEqual(&h, &tt.out) {
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                        t.Errorf("test %d:\nhave %v\nwant %v", i, h, tt.out)
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                }
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        }
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}
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func TestUncompressedSource(t *testing.T) {
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        decoder := NewReader(bytes.NewBuffer([]byte{0x01, 0x01, 0x00, 0xfe, 0xff, 0x11}))
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        output := make([]byte, 1)
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        n, error := decoder.Read(output)
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        if n != 1 || error != nil {
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                t.Fatalf("decoder.Read() = %d, %v, want 1, nil", n, error)
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        }
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        if output[0] != 0x11 {
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                t.Errorf("output[0] = %x, want 0x11", output[0])
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        }
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}

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