// 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 gzip

import (
	"bytes";
	"compress/gzip";
	"fmt";
	"io";
	"testing";
	"os";
)

type gzipTest struct {
	name string;
	desc string;
	raw string;
	gzip []byte;
	err os.Error;
}

var gzipTests = []gzipTest {
	gzipTest {	// has 1 empty fixed-huffman block
		"empty.txt",
		"empty.txt",
		"",
		[]byte {
			0x1f, 0x8b, 0x08, 0x08, 0xf7, 0x5e, 0x14, 0x4a,
			0x00, 0x03, 0x65, 0x6d, 0x70, 0x74, 0x79, 0x2e,
			0x74, 0x78, 0x74, 0x00, 0x03, 0x00, 0x00, 0x00,
			0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		},
		nil
	},
	gzipTest {	// has 1 non-empty fixed huffman block
		"hello.txt",
		"hello.txt",
		"hello world\n",
		[]byte {
			0x1f, 0x8b, 0x08, 0x08, 0xc8, 0x58, 0x13, 0x4a,
			0x00, 0x03, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2e,
			0x74, 0x78, 0x74, 0x00, 0xcb, 0x48, 0xcd, 0xc9,
			0xc9, 0x57, 0x28, 0xcf, 0x2f, 0xca, 0x49, 0xe1,
			0x02, 0x00, 0x2d, 0x3b, 0x08, 0xaf, 0x0c, 0x00,
			0x00, 0x00,
		},
		nil
	},
	gzipTest {	// concatenation
		"hello.txt",
		"hello.txt x2",
		"hello world\n"
		"hello world\n",
		[]byte {
			0x1f, 0x8b, 0x08, 0x08, 0xc8, 0x58, 0x13, 0x4a,
			0x00, 0x03, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2e,
			0x74, 0x78, 0x74, 0x00, 0xcb, 0x48, 0xcd, 0xc9,
			0xc9, 0x57, 0x28, 0xcf, 0x2f, 0xca, 0x49, 0xe1,
			0x02, 0x00, 0x2d, 0x3b, 0x08, 0xaf, 0x0c, 0x00,
			0x00, 0x00,
			0x1f, 0x8b, 0x08, 0x08, 0xc8, 0x58, 0x13, 0x4a,
			0x00, 0x03, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2e,
			0x74, 0x78, 0x74, 0x00, 0xcb, 0x48, 0xcd, 0xc9,
			0xc9, 0x57, 0x28, 0xcf, 0x2f, 0xca, 0x49, 0xe1,
			0x02, 0x00, 0x2d, 0x3b, 0x08, 0xaf, 0x0c, 0x00,
			0x00, 0x00,
		},
		nil
	},
	gzipTest {	// has dynamic huffman blocks
		"gettysburg",
		"gettysburg",
		"  Four score and seven years ago our fathers brought forth on\n"
		"this continent, a new nation, conceived in Liberty, and dedicated\n"
		"to the proposition that all men are created equal.\n"
		"  Now we are engaged in a great Civil War, testing whether that\n"
		"nation, or any nation so conceived and so dedicated, can long\n"
		"endure.\n"
		"  We are met on a great battle-field of that war.\n"
		"  We have come to dedicate a portion of that field, as a final\n"
		"resting place for those who here gave their lives that that\n"
		"nation might live.  It is altogether fitting and proper that\n"
		"we should do this.\n"
		"  But, in a larger sense, we can not dedicate — we can not\n"
		"consecrate — we can not hallow — this ground.\n"
		"  The brave men, living and dead, who struggled here, have\n"
		"consecrated it, far above our poor power to add or detract.\n"
		"The world will little note, nor long remember what we say here,\n"
		"but it can never forget what they did here.\n"
		"  It is for us the living, rather, to be dedicated here to the\n"
		"unfinished work which they who fought here have thus far so\n"
		"nobly advanced.  It is rather for us to be here dedicated to\n"
		"the great task remaining before us — that from these honored\n"
		"dead we take increased devotion to that cause for which they\n"
		"gave the last full measure of devotion —\n"
		"  that we here highly resolve that these dead shall not have\n"
		"died in vain — that this nation, under God, shall have a new\n"
		"birth of freedom — and that government of the people, by the\n"
		"people, for the people, shall not perish from this earth.\n"
		"\n"
		"Abraham Lincoln, November 19, 1863, Gettysburg, Pennsylvania\n",
		[]byte {
			0x1f, 0x8b, 0x08, 0x08, 0xd1, 0x12, 0x2b, 0x4a,
			0x00, 0x03, 0x67, 0x65, 0x74, 0x74, 0x79, 0x73,
			0x62, 0x75, 0x72, 0x67, 0x00, 0x65, 0x54, 0xcd,
			0x6e, 0xd4, 0x30, 0x10, 0xbe, 0xfb, 0x29, 0xe6,
			0x01, 0x42, 0xa5, 0x0a, 0x09, 0xc1, 0x11, 0x90,
			0x40, 0x48, 0xa8, 0xe2, 0x80, 0xd4, 0xf3, 0x24,
			0x9e, 0x24, 0x56, 0xbd, 0x9e, 0xc5, 0x76, 0x76,
			0x95, 0x1b, 0x0f, 0xc1, 0x13, 0xf2, 0x24, 0x7c,
			0x63, 0x77, 0x9b, 0x4a, 0x5c, 0xaa, 0x6e, 0x6c,
			0xcf, 0x7c, 0x7f, 0x33, 0x44, 0x5f, 0x74, 0xcb,
			0x54, 0x26, 0xcd, 0x42, 0x9c, 0x3c, 0x15, 0xb9,
			0x48, 0xa2, 0x5d, 0x38, 0x17, 0xe2, 0x45, 0xc9,
			0x4e, 0x67, 0xae, 0xab, 0xe0, 0xf7, 0x98, 0x75,
			0x5b, 0xd6, 0x4a, 0xb3, 0xe6, 0xba, 0x92, 0x26,
			0x57, 0xd7, 0x50, 0x68, 0xd2, 0x54, 0x43, 0x92,
			0x54, 0x07, 0x62, 0x4a, 0x72, 0xa5, 0xc4, 0x35,
			0x68, 0x1a, 0xec, 0x60, 0x92, 0x70, 0x11, 0x4f,
			0x21, 0xd1, 0xf7, 0x30, 0x4a, 0xae, 0xfb, 0xd0,
			0x9a, 0x78, 0xf1, 0x61, 0xe2, 0x2a, 0xde, 0x55,
			0x25, 0xd4, 0xa6, 0x73, 0xd6, 0xb3, 0x96, 0x60,
			0xef, 0xf0, 0x9b, 0x2b, 0x71, 0x8c, 0x74, 0x02,
			0x10, 0x06, 0xac, 0x29, 0x8b, 0xdd, 0x25, 0xf9,
			0xb5, 0x71, 0xbc, 0x73, 0x44, 0x0f, 0x7a, 0xa5,
			0xab, 0xb4, 0x33, 0x49, 0x0b, 0x2f, 0xbd, 0x03,
			0xd3, 0x62, 0x17, 0xe9, 0x73, 0xb8, 0x84, 0x48,
			0x8f, 0x9c, 0x07, 0xaa, 0x52, 0x00, 0x6d, 0xa1,
			0xeb, 0x2a, 0xc6, 0xa0, 0x95, 0x76, 0x37, 0x78,
			0x9a, 0x81, 0x65, 0x7f, 0x46, 0x4b, 0x45, 0x5f,
			0xe1, 0x6d, 0x42, 0xe8, 0x01, 0x13, 0x5c, 0x38,
			0x51, 0xd4, 0xb4, 0x38, 0x49, 0x7e, 0xcb, 0x62,
			0x28, 0x1e, 0x3b, 0x82, 0x93, 0x54, 0x48, 0xf1,
			0xd2, 0x7d, 0xe4, 0x5a, 0xa3, 0xbc, 0x99, 0x83,
			0x44, 0x4f, 0x3a, 0x77, 0x36, 0x57, 0xce, 0xcf,
			0x2f, 0x56, 0xbe, 0x80, 0x90, 0x9e, 0x84, 0xea,
			0x51, 0x1f, 0x8f, 0xcf, 0x90, 0xd4, 0x60, 0xdc,
			0x5e, 0xb4, 0xf7, 0x10, 0x0b, 0x26, 0xe0, 0xff,
			0xc4, 0xd1, 0xe5, 0x67, 0x2e, 0xe7, 0xc8, 0x93,
			0x98, 0x05, 0xb8, 0xa8, 0x45, 0xc0, 0x4d, 0x09,
			0xdc, 0x84, 0x16, 0x2b, 0x0d, 0x9a, 0x21, 0x53,
			0x04, 0x8b, 0xd2, 0x0b, 0xbd, 0xa2, 0x4c, 0xa7,
			0x60, 0xee, 0xd9, 0xe1, 0x1d, 0xd1, 0xb7, 0x4a,
			0x30, 0x8f, 0x63, 0xd5, 0xa5, 0x8b, 0x33, 0x87,
			0xda, 0x1a, 0x18, 0x79, 0xf3, 0xe3, 0xa6, 0x17,
			0x94, 0x2e, 0xab, 0x6e, 0xa0, 0xe3, 0xcd, 0xac,
			0x50, 0x8c, 0xca, 0xa7, 0x0d, 0x76, 0x37, 0xd1,
			0x23, 0xe7, 0x05, 0x57, 0x8b, 0xa4, 0x22, 0x83,
			0xd9, 0x62, 0x52, 0x25, 0xad, 0x07, 0xbb, 0xbf,
			0xbf, 0xff, 0xbc, 0xfa, 0xee, 0x20, 0x73, 0x91,
			0x29, 0xff, 0x7f, 0x02, 0x71, 0x62, 0x84, 0xb5,
			0xf6, 0xb5, 0x25, 0x6b, 0x41, 0xde, 0x92, 0xb7,
			0x76, 0x3f, 0x91, 0x91, 0x31, 0x1b, 0x41, 0x84,
			0x62, 0x30, 0x0a, 0x37, 0xa4, 0x5e, 0x18, 0x3a,
			0x99, 0x08, 0xa5, 0xe6, 0x6d, 0x59, 0x22, 0xec,
			0x33, 0x39, 0x86, 0x26, 0xf5, 0xab, 0x66, 0xc8,
			0x08, 0x20, 0xcf, 0x0c, 0xd7, 0x47, 0x45, 0x21,
			0x0b, 0xf6, 0x59, 0xd5, 0xfe, 0x5c, 0x8d, 0xaa,
			0x12, 0x7b, 0x6f, 0xa1, 0xf0, 0x52, 0x33, 0x4f,
			0xf5, 0xce, 0x59, 0xd3, 0xab, 0x66, 0x10, 0xbf,
			0x06, 0xc4, 0x31, 0x06, 0x73, 0xd6, 0x80, 0xa2,
			0x78, 0xc2, 0x45, 0xcb, 0x03, 0x65, 0x39, 0xc9,
			0x09, 0xd1, 0x06, 0x04, 0x33, 0x1a, 0x5a, 0xf1,
			0xde, 0x01, 0xb8, 0x71, 0x83, 0xc4, 0xb5, 0xb3,
			0xc3, 0x54, 0x65, 0x33, 0x0d, 0x5a, 0xf7, 0x9b,
			0x90, 0x7c, 0x27, 0x1f, 0x3a, 0x58, 0xa3, 0xd8,
			0xfd, 0x30, 0x5f, 0xb7, 0xd2, 0x66, 0xa2, 0x93,
			0x1c, 0x28, 0xb7, 0xe9, 0x1b, 0x0c, 0xe1, 0x28,
			0x47, 0x26, 0xbb, 0xe9, 0x7d, 0x7e, 0xdc, 0x96,
			0x10, 0x92, 0x50, 0x56, 0x7c, 0x06, 0xe2, 0x27,
			0xb4, 0x08, 0xd3, 0xda, 0x7b, 0x98, 0x34, 0x73,
			0x9f, 0xdb, 0xf6, 0x62, 0xed, 0x31, 0x41, 0x13,
			0xd3, 0xa2, 0xa8, 0x4b, 0x3a, 0xc6, 0x1d, 0xe4,
			0x2f, 0x8c, 0xf8, 0xfb, 0x97, 0x64, 0xf4, 0xb6,
			0x2f, 0x80, 0x5a, 0xf3, 0x56, 0xe0, 0x40, 0x50,
			0xd5, 0x19, 0xd0, 0x1e, 0xfc, 0xca, 0xe5, 0xc9,
			0xd4, 0x60, 0x00, 0x81, 0x2e, 0xa3, 0xcc, 0xb6,
			0x52, 0xf0, 0xb4, 0xdb, 0x69, 0x99, 0xce, 0x7a,
			0x32, 0x4c, 0x08, 0xed, 0xaa, 0x10, 0x10, 0xe3,
			0x6f, 0xee, 0x99, 0x68, 0x95, 0x9f, 0x04, 0x71,
			0xb2, 0x49, 0x2f, 0x62, 0xa6, 0x5e, 0xb4, 0xef,
			0x02, 0xed, 0x4f, 0x27, 0xde, 0x4a, 0x0f, 0xfd,
			0xc1, 0xcc, 0xdd, 0x02, 0x8f, 0x08, 0x16, 0x54,
			0xdf, 0xda, 0xca, 0xe0, 0x82, 0xf1, 0xb4, 0x31,
			0x7a, 0xa9, 0x81, 0xfe, 0x90, 0xb7, 0x3e, 0xdb,
			0xd3, 0x35, 0xc0, 0x20, 0x80, 0x33, 0x46, 0x4a,
			0x63, 0xab, 0xd1, 0x0d, 0x29, 0xd2, 0xe2, 0x84,
			0xb8, 0xdb, 0xfa, 0xe9, 0x89, 0x44, 0x86, 0x7c,
			0xe8, 0x0b, 0xe6, 0x02, 0x6a, 0x07, 0x9b, 0x96,
			0xd0, 0xdb, 0x2e, 0x41, 0x4c, 0xa1, 0xd5, 0x57,
			0x45, 0x14, 0xfb, 0xe3, 0xa6, 0x72, 0x5b, 0x87,
			0x6e, 0x0c, 0x6d, 0x5b, 0xce, 0xe0, 0x2f, 0xe2,
			0x21, 0x81, 0x95, 0xb0, 0xe8, 0xb6, 0x32, 0x0b,
			0xb2, 0x98, 0x13, 0x52, 0x5d, 0xfb, 0xec, 0x63,
			0x17, 0x8a, 0x9e, 0x23, 0x22, 0x36, 0xee, 0xcd,
			0xda, 0xdb, 0xcf, 0x3e, 0xf1, 0xc7, 0xf1, 0x01,
			0x12, 0x93, 0x0a, 0xeb, 0x6f, 0xf2, 0x02, 0x15,
			0x96, 0x77, 0x5d, 0xef, 0x9c, 0xfb, 0x88, 0x91,
			0x59, 0xf9, 0x84, 0xdd, 0x9b, 0x26, 0x8d, 0x80,
			0xf9, 0x80, 0x66, 0x2d, 0xac, 0xf7, 0x1f, 0x06,
			0xba, 0x7f, 0xff, 0xee, 0xed, 0x40, 0x5f, 0xa5,
			0xd6, 0xbd, 0x8c, 0x5b, 0x46, 0xd2, 0x7e, 0x48,
			0x4a, 0x65, 0x8f, 0x08, 0x42, 0x60, 0xf7, 0x0f,
			0xb9, 0x16, 0x0b, 0x0c, 0x1a, 0x06, 0x00, 0x00,
		},
		nil
	},
	gzipTest {	// has 1 non-empty fixed huffman block then garbage
		"hello.txt",
		"hello.txt + garbage",
		"hello world\n",
		[]byte {
			0x1f, 0x8b, 0x08, 0x08, 0xc8, 0x58, 0x13, 0x4a,
			0x00, 0x03, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2e,
			0x74, 0x78, 0x74, 0x00, 0xcb, 0x48, 0xcd, 0xc9,
			0xc9, 0x57, 0x28, 0xcf, 0x2f, 0xca, 0x49, 0xe1,
			0x02, 0x00, 0x2d, 0x3b, 0x08, 0xaf, 0x0c, 0x00,
			0x00, 0x00, 'g', 'a', 'r', 'b', 'a', 'g', 'e', '!', '!', '!',
		},
		HeaderError,
	},
	gzipTest {	// has 1 non-empty fixed huffman block not enough header
		"hello.txt",
		"hello.txt + garbage",
		"hello world\n",
		[]byte {
			0x1f, 0x8b, 0x08, 0x08, 0xc8, 0x58, 0x13, 0x4a,
			0x00, 0x03, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2e,
			0x74, 0x78, 0x74, 0x00, 0xcb, 0x48, 0xcd, 0xc9,
			0xc9, 0x57, 0x28, 0xcf, 0x2f, 0xca, 0x49, 0xe1,
			0x02, 0x00, 0x2d, 0x3b, 0x08, 0xaf, 0x0c, 0x00,
			0x00, 0x00, gzipID1,
		},
		io.ErrUnexpectedEOF,
	},
	gzipTest {	// has 1 non-empty fixed huffman block but corrupt checksum
		"hello.txt",
		"hello.txt + corrupt checksum",
		"hello world\n",
		[]byte {
			0x1f, 0x8b, 0x08, 0x08, 0xc8, 0x58, 0x13, 0x4a,
			0x00, 0x03, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2e,
			0x74, 0x78, 0x74, 0x00, 0xcb, 0x48, 0xcd, 0xc9,
			0xc9, 0x57, 0x28, 0xcf, 0x2f, 0xca, 0x49, 0xe1,
			0x02, 0x00, 0xff, 0xff, 0xff, 0xff, 0x0c, 0x00,
			0x00, 0x00,
		},
		ChecksumError,
	},
	gzipTest {	// has 1 non-empty fixed huffman block but corrupt size
		"hello.txt",
		"hello.txt + corrupt size",
		"hello world\n",
		[]byte {
			0x1f, 0x8b, 0x08, 0x08, 0xc8, 0x58, 0x13, 0x4a,
			0x00, 0x03, 0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x2e,
			0x74, 0x78, 0x74, 0x00, 0xcb, 0x48, 0xcd, 0xc9,
			0xc9, 0x57, 0x28, 0xcf, 0x2f, 0xca, 0x49, 0xe1,
			0x02, 0x00, 0x2d, 0x3b, 0x08, 0xaf, 0xff, 0x00,
			0x00, 0x00,
		},
		ChecksumError,
	},
}

func TestGzipInflater(t *testing.T) {
	b := new(bytes.Buffer);
	for i, tt := range gzipTests {
		in := io.NewByteReader(tt.gzip);
		gzip, err := NewGzipInflater(in);
		if err != nil {
			t.Errorf("%s: NewGzipInflater: %s", tt.name, err);
			continue;
		}
		if tt.name != gzip.Name {
			t.Errorf("%s: got name %s", tt.name, gzip.Name);
		}
		b.Reset();
		n, err := io.Copy(gzip, b);
		if err != tt.err {
			t.Errorf("%s: io.Copy: %v want %v", tt.name, err, tt.err);
		}
		s := string(b.Data());
		if s != tt.raw {
			t.Errorf("%s: got %d-byte %q want %d-byte %q", tt.name, n, s, len(tt.raw), tt.raw);
		}
	}
}