From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libgo/go/archive/tar/common.go | 75 ++++++++ libgo/go/archive/tar/reader.go | 226 ++++++++++++++++++++++ libgo/go/archive/tar/reader_test.go | 274 +++++++++++++++++++++++++++ libgo/go/archive/tar/testdata/gnu.tar | Bin 0 -> 3072 bytes libgo/go/archive/tar/testdata/small.txt | 1 + libgo/go/archive/tar/testdata/small2.txt | 1 + libgo/go/archive/tar/testdata/star.tar | Bin 0 -> 3072 bytes libgo/go/archive/tar/testdata/v7.tar | Bin 0 -> 3584 bytes libgo/go/archive/tar/testdata/writer-big.tar | Bin 0 -> 4096 bytes libgo/go/archive/tar/testdata/writer.tar | Bin 0 -> 3072 bytes libgo/go/archive/tar/writer.go | 205 ++++++++++++++++++++ libgo/go/archive/tar/writer_test.go | 154 +++++++++++++++ 12 files changed, 936 insertions(+) create mode 100644 libgo/go/archive/tar/common.go create mode 100644 libgo/go/archive/tar/reader.go create mode 100644 libgo/go/archive/tar/reader_test.go create mode 100644 libgo/go/archive/tar/testdata/gnu.tar create mode 100644 libgo/go/archive/tar/testdata/small.txt create mode 100644 libgo/go/archive/tar/testdata/small2.txt create mode 100644 libgo/go/archive/tar/testdata/star.tar create mode 100644 libgo/go/archive/tar/testdata/v7.tar create mode 100644 libgo/go/archive/tar/testdata/writer-big.tar create mode 100644 libgo/go/archive/tar/testdata/writer.tar create mode 100644 libgo/go/archive/tar/writer.go create mode 100644 libgo/go/archive/tar/writer_test.go (limited to 'libgo/go/archive/tar') diff --git a/libgo/go/archive/tar/common.go b/libgo/go/archive/tar/common.go new file mode 100644 index 000000000..5b781ff3d --- /dev/null +++ b/libgo/go/archive/tar/common.go @@ -0,0 +1,75 @@ +// 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. + +// The tar package implements access to tar archives. +// It aims to cover most of the variations, including those produced +// by GNU and BSD tars. +// +// References: +// http://www.freebsd.org/cgi/man.cgi?query=tar&sektion=5 +// http://www.gnu.org/software/tar/manual/html_node/Standard.html +package tar + +const ( + blockSize = 512 + + // Types + TypeReg = '0' + TypeRegA = '\x00' + TypeLink = '1' + TypeSymlink = '2' + TypeChar = '3' + TypeBlock = '4' + TypeDir = '5' + TypeFifo = '6' + TypeCont = '7' + TypeXHeader = 'x' + TypeXGlobalHeader = 'g' +) + +// A Header represents a single header in a tar archive. +// Some fields may not be populated. +type Header struct { + Name string + Mode int64 + Uid int + Gid int + Size int64 + Mtime int64 + Typeflag byte + Linkname string + Uname string + Gname string + Devmajor int64 + Devminor int64 + Atime int64 + Ctime int64 +} + +var zeroBlock = make([]byte, blockSize) + +// POSIX specifies a sum of the unsigned byte values, but the Sun tar uses signed byte values. +// We compute and return both. +func checksum(header []byte) (unsigned int64, signed int64) { + for i := 0; i < len(header); i++ { + if i == 148 { + // The chksum field (header[148:156]) is special: it should be treated as space bytes. + unsigned += ' ' * 8 + signed += ' ' * 8 + i += 7 + continue + } + unsigned += int64(header[i]) + signed += int64(int8(header[i])) + } + return +} + +type slicer []byte + +func (sp *slicer) next(n int) (b []byte) { + s := *sp + b, *sp = s[0:n], s[n:] + return +} diff --git a/libgo/go/archive/tar/reader.go b/libgo/go/archive/tar/reader.go new file mode 100644 index 000000000..35a15f74b --- /dev/null +++ b/libgo/go/archive/tar/reader.go @@ -0,0 +1,226 @@ +// 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 tar + +// TODO(dsymonds): +// - pax extensions + +import ( + "bytes" + "io" + "os" + "strconv" +) + +var ( + HeaderError os.Error = os.ErrorString("invalid tar header") +) + +// A Reader provides sequential access to the contents of a tar archive. +// A tar archive consists of a sequence of files. +// The Next method advances to the next file in the archive (including the first), +// and then it can be treated as an io.Reader to access the file's data. +// +// Example: +// tr := tar.NewReader(r) +// for { +// hdr, err := tr.Next() +// if err != nil { +// // handle error +// } +// if hdr == nil { +// // end of tar archive +// break +// } +// io.Copy(data, tr) +// } +type Reader struct { + r io.Reader + err os.Error + nb int64 // number of unread bytes for current file entry + pad int64 // amount of padding (ignored) after current file entry +} + +// NewReader creates a new Reader reading from r. +func NewReader(r io.Reader) *Reader { return &Reader{r: r} } + +// Next advances to the next entry in the tar archive. +func (tr *Reader) Next() (*Header, os.Error) { + var hdr *Header + if tr.err == nil { + tr.skipUnread() + } + if tr.err == nil { + hdr = tr.readHeader() + } + return hdr, tr.err +} + +// Parse bytes as a NUL-terminated C-style string. +// If a NUL byte is not found then the whole slice is returned as a string. +func cString(b []byte) string { + n := 0 + for n < len(b) && b[n] != 0 { + n++ + } + return string(b[0:n]) +} + +func (tr *Reader) octal(b []byte) int64 { + // Removing leading spaces. + for len(b) > 0 && b[0] == ' ' { + b = b[1:] + } + // Removing trailing NULs and spaces. + for len(b) > 0 && (b[len(b)-1] == ' ' || b[len(b)-1] == '\x00') { + b = b[0 : len(b)-1] + } + x, err := strconv.Btoui64(cString(b), 8) + if err != nil { + tr.err = err + } + return int64(x) +} + +type ignoreWriter struct{} + +func (ignoreWriter) Write(b []byte) (n int, err os.Error) { + return len(b), nil +} + +// Skip any unread bytes in the existing file entry, as well as any alignment padding. +func (tr *Reader) skipUnread() { + nr := tr.nb + tr.pad // number of bytes to skip + tr.nb, tr.pad = 0, 0 + if sr, ok := tr.r.(io.Seeker); ok { + if _, err := sr.Seek(nr, 1); err == nil { + return + } + } + _, tr.err = io.Copyn(ignoreWriter{}, tr.r, nr) +} + +func (tr *Reader) verifyChecksum(header []byte) bool { + if tr.err != nil { + return false + } + + given := tr.octal(header[148:156]) + unsigned, signed := checksum(header) + return given == unsigned || given == signed +} + +func (tr *Reader) readHeader() *Header { + header := make([]byte, blockSize) + if _, tr.err = io.ReadFull(tr.r, header); tr.err != nil { + return nil + } + + // Two blocks of zero bytes marks the end of the archive. + if bytes.Equal(header, zeroBlock[0:blockSize]) { + if _, tr.err = io.ReadFull(tr.r, header); tr.err != nil { + return nil + } + if bytes.Equal(header, zeroBlock[0:blockSize]) { + tr.err = os.EOF + } else { + tr.err = HeaderError // zero block and then non-zero block + } + return nil + } + + if !tr.verifyChecksum(header) { + tr.err = HeaderError + return nil + } + + // Unpack + hdr := new(Header) + s := slicer(header) + + hdr.Name = cString(s.next(100)) + hdr.Mode = tr.octal(s.next(8)) + hdr.Uid = int(tr.octal(s.next(8))) + hdr.Gid = int(tr.octal(s.next(8))) + hdr.Size = tr.octal(s.next(12)) + hdr.Mtime = tr.octal(s.next(12)) + s.next(8) // chksum + hdr.Typeflag = s.next(1)[0] + hdr.Linkname = cString(s.next(100)) + + // The remainder of the header depends on the value of magic. + // The original (v7) version of tar had no explicit magic field, + // so its magic bytes, like the rest of the block, are NULs. + magic := string(s.next(8)) // contains version field as well. + var format string + switch magic { + case "ustar\x0000": // POSIX tar (1003.1-1988) + if string(header[508:512]) == "tar\x00" { + format = "star" + } else { + format = "posix" + } + case "ustar \x00": // old GNU tar + format = "gnu" + } + + switch format { + case "posix", "gnu", "star": + hdr.Uname = cString(s.next(32)) + hdr.Gname = cString(s.next(32)) + devmajor := s.next(8) + devminor := s.next(8) + if hdr.Typeflag == TypeChar || hdr.Typeflag == TypeBlock { + hdr.Devmajor = tr.octal(devmajor) + hdr.Devminor = tr.octal(devminor) + } + var prefix string + switch format { + case "posix", "gnu": + prefix = cString(s.next(155)) + case "star": + prefix = cString(s.next(131)) + hdr.Atime = tr.octal(s.next(12)) + hdr.Ctime = tr.octal(s.next(12)) + } + if len(prefix) > 0 { + hdr.Name = prefix + "/" + hdr.Name + } + } + + if tr.err != nil { + tr.err = HeaderError + return nil + } + + // Maximum value of hdr.Size is 64 GB (12 octal digits), + // so there's no risk of int64 overflowing. + tr.nb = int64(hdr.Size) + tr.pad = -tr.nb & (blockSize - 1) // blockSize is a power of two + + return hdr +} + +// Read reads from the current entry in the tar archive. +// It returns 0, os.EOF when it reaches the end of that entry, +// until Next is called to advance to the next entry. +func (tr *Reader) Read(b []byte) (n int, err os.Error) { + if tr.nb == 0 { + // file consumed + return 0, os.EOF + } + + if int64(len(b)) > tr.nb { + b = b[0:tr.nb] + } + n, err = tr.r.Read(b) + tr.nb -= int64(n) + + if err == os.EOF && tr.nb > 0 { + err = io.ErrUnexpectedEOF + } + tr.err = err + return +} diff --git a/libgo/go/archive/tar/reader_test.go b/libgo/go/archive/tar/reader_test.go new file mode 100644 index 000000000..aa4c797fb --- /dev/null +++ b/libgo/go/archive/tar/reader_test.go @@ -0,0 +1,274 @@ +// 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 tar + +import ( + "bytes" + "crypto/md5" + "fmt" + "io" + "os" + "reflect" + "testing" +) + +type untarTest struct { + file string + headers []*Header + cksums []string +} + +var gnuTarTest = &untarTest{ + file: "testdata/gnu.tar", + headers: []*Header{ + &Header{ + Name: "small.txt", + Mode: 0640, + Uid: 73025, + Gid: 5000, + Size: 5, + Mtime: 1244428340, + Typeflag: '0', + Uname: "dsymonds", + Gname: "eng", + }, + &Header{ + Name: "small2.txt", + Mode: 0640, + Uid: 73025, + Gid: 5000, + Size: 11, + Mtime: 1244436044, + Typeflag: '0', + Uname: "dsymonds", + Gname: "eng", + }, + }, + cksums: []string{ + "e38b27eaccb4391bdec553a7f3ae6b2f", + "c65bd2e50a56a2138bf1716f2fd56fe9", + }, +} + +var untarTests = []*untarTest{ + gnuTarTest, + &untarTest{ + file: "testdata/star.tar", + headers: []*Header{ + &Header{ + Name: "small.txt", + Mode: 0640, + Uid: 73025, + Gid: 5000, + Size: 5, + Mtime: 1244592783, + Typeflag: '0', + Uname: "dsymonds", + Gname: "eng", + Atime: 1244592783, + Ctime: 1244592783, + }, + &Header{ + Name: "small2.txt", + Mode: 0640, + Uid: 73025, + Gid: 5000, + Size: 11, + Mtime: 1244592783, + Typeflag: '0', + Uname: "dsymonds", + Gname: "eng", + Atime: 1244592783, + Ctime: 1244592783, + }, + }, + }, + &untarTest{ + file: "testdata/v7.tar", + headers: []*Header{ + &Header{ + Name: "small.txt", + Mode: 0444, + Uid: 73025, + Gid: 5000, + Size: 5, + Mtime: 1244593104, + Typeflag: '\x00', + }, + &Header{ + Name: "small2.txt", + Mode: 0444, + Uid: 73025, + Gid: 5000, + Size: 11, + Mtime: 1244593104, + Typeflag: '\x00', + }, + }, + }, +} + +func TestReader(t *testing.T) { +testLoop: + for i, test := range untarTests { + f, err := os.Open(test.file, os.O_RDONLY, 0444) + if err != nil { + t.Errorf("test %d: Unexpected error: %v", i, err) + continue + } + tr := NewReader(f) + for j, header := range test.headers { + hdr, err := tr.Next() + if err != nil || hdr == nil { + t.Errorf("test %d, entry %d: Didn't get entry: %v", i, j, err) + f.Close() + continue testLoop + } + if !reflect.DeepEqual(hdr, header) { + t.Errorf("test %d, entry %d: Incorrect header:\nhave %+v\nwant %+v", + i, j, *hdr, *header) + } + } + hdr, err := tr.Next() + if err == os.EOF { + break + } + if hdr != nil || err != nil { + t.Errorf("test %d: Unexpected entry or error: hdr=%v err=%v", i, hdr, err) + } + f.Close() + } +} + +func TestPartialRead(t *testing.T) { + f, err := os.Open("testdata/gnu.tar", os.O_RDONLY, 0444) + if err != nil { + t.Fatalf("Unexpected error: %v", err) + } + defer f.Close() + + tr := NewReader(f) + + // Read the first four bytes; Next() should skip the last byte. + hdr, err := tr.Next() + if err != nil || hdr == nil { + t.Fatalf("Didn't get first file: %v", err) + } + buf := make([]byte, 4) + if _, err := io.ReadFull(tr, buf); err != nil { + t.Fatalf("Unexpected error: %v", err) + } + if expected := []byte("Kilt"); !bytes.Equal(buf, expected) { + t.Errorf("Contents = %v, want %v", buf, expected) + } + + // Second file + hdr, err = tr.Next() + if err != nil || hdr == nil { + t.Fatalf("Didn't get second file: %v", err) + } + buf = make([]byte, 6) + if _, err := io.ReadFull(tr, buf); err != nil { + t.Fatalf("Unexpected error: %v", err) + } + if expected := []byte("Google"); !bytes.Equal(buf, expected) { + t.Errorf("Contents = %v, want %v", buf, expected) + } +} + + +func TestIncrementalRead(t *testing.T) { + test := gnuTarTest + f, err := os.Open(test.file, os.O_RDONLY, 0444) + if err != nil { + t.Fatalf("Unexpected error: %v", err) + } + defer f.Close() + + tr := NewReader(f) + + headers := test.headers + cksums := test.cksums + nread := 0 + + // loop over all files + for ; ; nread++ { + hdr, err := tr.Next() + if hdr == nil || err == os.EOF { + break + } + + // check the header + if !reflect.DeepEqual(hdr, headers[nread]) { + t.Errorf("Incorrect header:\nhave %+v\nwant %+v", + *hdr, headers[nread]) + } + + // read file contents in little chunks EOF, + // checksumming all the way + h := md5.New() + rdbuf := make([]uint8, 8) + for { + nr, err := tr.Read(rdbuf) + if err == os.EOF { + break + } + if err != nil { + t.Errorf("Read: unexpected error %v\n", err) + break + } + h.Write(rdbuf[0:nr]) + } + // verify checksum + have := fmt.Sprintf("%x", h.Sum()) + want := cksums[nread] + if want != have { + t.Errorf("Bad checksum on file %s:\nhave %+v\nwant %+v", hdr.Name, have, want) + } + } + if nread != len(headers) { + t.Errorf("Didn't process all files\nexpected: %d\nprocessed %d\n", len(headers), nread) + } +} + +func TestNonSeekable(t *testing.T) { + test := gnuTarTest + f, err := os.Open(test.file, os.O_RDONLY, 0444) + if err != nil { + t.Fatalf("Unexpected error: %v", err) + } + defer f.Close() + + // pipe the data in + r, w, err := os.Pipe() + if err != nil { + t.Fatalf("Unexpected error %s", err) + } + go func() { + rdbuf := make([]uint8, 1<<16) + for { + nr, err := f.Read(rdbuf) + w.Write(rdbuf[0:nr]) + if err == os.EOF { + break + } + } + w.Close() + }() + + tr := NewReader(r) + nread := 0 + + for ; ; nread++ { + hdr, err := tr.Next() + if hdr == nil || err == os.EOF { + break + } + } + + if nread != len(test.headers) { + t.Errorf("Didn't process all files\nexpected: %d\nprocessed %d\n", len(test.headers), nread) + } +} diff --git a/libgo/go/archive/tar/testdata/gnu.tar b/libgo/go/archive/tar/testdata/gnu.tar new file mode 100644 index 000000000..fc899dc8d Binary files /dev/null and b/libgo/go/archive/tar/testdata/gnu.tar differ diff --git a/libgo/go/archive/tar/testdata/small.txt b/libgo/go/archive/tar/testdata/small.txt new file mode 100644 index 000000000..b249bfc51 --- /dev/null +++ b/libgo/go/archive/tar/testdata/small.txt @@ -0,0 +1 @@ +Kilts \ No newline at end of file diff --git a/libgo/go/archive/tar/testdata/small2.txt b/libgo/go/archive/tar/testdata/small2.txt new file mode 100644 index 000000000..394ee3ecd --- /dev/null +++ b/libgo/go/archive/tar/testdata/small2.txt @@ -0,0 +1 @@ +Google.com diff --git a/libgo/go/archive/tar/testdata/star.tar b/libgo/go/archive/tar/testdata/star.tar new file mode 100644 index 000000000..59e2d4e60 Binary files /dev/null and b/libgo/go/archive/tar/testdata/star.tar differ diff --git a/libgo/go/archive/tar/testdata/v7.tar b/libgo/go/archive/tar/testdata/v7.tar new file mode 100644 index 000000000..eb65fc941 Binary files /dev/null and b/libgo/go/archive/tar/testdata/v7.tar differ diff --git a/libgo/go/archive/tar/testdata/writer-big.tar b/libgo/go/archive/tar/testdata/writer-big.tar new file mode 100644 index 000000000..753e883ce Binary files /dev/null and b/libgo/go/archive/tar/testdata/writer-big.tar differ diff --git a/libgo/go/archive/tar/testdata/writer.tar b/libgo/go/archive/tar/testdata/writer.tar new file mode 100644 index 000000000..0358f91b9 Binary files /dev/null and b/libgo/go/archive/tar/testdata/writer.tar differ diff --git a/libgo/go/archive/tar/writer.go b/libgo/go/archive/tar/writer.go new file mode 100644 index 000000000..8673bad31 --- /dev/null +++ b/libgo/go/archive/tar/writer.go @@ -0,0 +1,205 @@ +// 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 tar + +// TODO(dsymonds): +// - catch more errors (no first header, write after close, etc.) + +import ( + "io" + "os" + "strconv" +) + +var ( + ErrWriteTooLong = os.NewError("write too long") + ErrFieldTooLong = os.NewError("header field too long") + ErrWriteAfterClose = os.NewError("write after close") +) + +// A Writer provides sequential writing of a tar archive in POSIX.1 format. +// A tar archive consists of a sequence of files. +// Call WriteHeader to begin a new file, and then call Write to supply that file's data, +// writing at most hdr.Size bytes in total. +// +// Example: +// tw := tar.NewWriter(w) +// hdr := new(Header) +// hdr.Size = length of data in bytes +// // populate other hdr fields as desired +// if err := tw.WriteHeader(hdr); err != nil { +// // handle error +// } +// io.Copy(tw, data) +// tw.Close() +type Writer struct { + w io.Writer + err os.Error + nb int64 // number of unwritten bytes for current file entry + pad int64 // amount of padding to write after current file entry + closed bool + usedBinary bool // whether the binary numeric field extension was used +} + +// NewWriter creates a new Writer writing to w. +func NewWriter(w io.Writer) *Writer { return &Writer{w: w} } + +// Flush finishes writing the current file (optional). +func (tw *Writer) Flush() os.Error { + n := tw.nb + tw.pad + for n > 0 && tw.err == nil { + nr := n + if nr > blockSize { + nr = blockSize + } + var nw int + nw, tw.err = tw.w.Write(zeroBlock[0:nr]) + n -= int64(nw) + } + tw.nb = 0 + tw.pad = 0 + return tw.err +} + +// Write s into b, terminating it with a NUL if there is room. +func (tw *Writer) cString(b []byte, s string) { + if len(s) > len(b) { + if tw.err == nil { + tw.err = ErrFieldTooLong + } + return + } + copy(b, s) + if len(s) < len(b) { + b[len(s)] = 0 + } +} + +// Encode x as an octal ASCII string and write it into b with leading zeros. +func (tw *Writer) octal(b []byte, x int64) { + s := strconv.Itob64(x, 8) + // leading zeros, but leave room for a NUL. + for len(s)+1 < len(b) { + s = "0" + s + } + tw.cString(b, s) +} + +// Write x into b, either as octal or as binary (GNUtar/star extension). +func (tw *Writer) numeric(b []byte, x int64) { + // Try octal first. + s := strconv.Itob64(x, 8) + if len(s) < len(b) { + tw.octal(b, x) + return + } + // Too big: use binary (big-endian). + tw.usedBinary = true + for i := len(b) - 1; x > 0 && i >= 0; i-- { + b[i] = byte(x) + x >>= 8 + } + b[0] |= 0x80 // highest bit indicates binary format +} + +// WriteHeader writes hdr and prepares to accept the file's contents. +// WriteHeader calls Flush if it is not the first header. +// Calling after a Close will return ErrWriteAfterClose. +func (tw *Writer) WriteHeader(hdr *Header) os.Error { + if tw.closed { + return ErrWriteAfterClose + } + if tw.err == nil { + tw.Flush() + } + if tw.err != nil { + return tw.err + } + + tw.nb = int64(hdr.Size) + tw.pad = -tw.nb & (blockSize - 1) // blockSize is a power of two + + header := make([]byte, blockSize) + s := slicer(header) + + // TODO(dsymonds): handle names longer than 100 chars + copy(s.next(100), []byte(hdr.Name)) + + tw.octal(s.next(8), hdr.Mode) // 100:108 + tw.numeric(s.next(8), int64(hdr.Uid)) // 108:116 + tw.numeric(s.next(8), int64(hdr.Gid)) // 116:124 + tw.numeric(s.next(12), hdr.Size) // 124:136 + tw.numeric(s.next(12), hdr.Mtime) // 136:148 + s.next(8) // chksum (148:156) + s.next(1)[0] = hdr.Typeflag // 156:157 + s.next(100) // linkname (157:257) + copy(s.next(8), []byte("ustar\x0000")) // 257:265 + tw.cString(s.next(32), hdr.Uname) // 265:297 + tw.cString(s.next(32), hdr.Gname) // 297:329 + tw.numeric(s.next(8), hdr.Devmajor) // 329:337 + tw.numeric(s.next(8), hdr.Devminor) // 337:345 + + // Use the GNU magic instead of POSIX magic if we used any GNU extensions. + if tw.usedBinary { + copy(header[257:265], []byte("ustar \x00")) + } + + // The chksum field is terminated by a NUL and a space. + // This is different from the other octal fields. + chksum, _ := checksum(header) + tw.octal(header[148:155], chksum) + header[155] = ' ' + + if tw.err != nil { + // problem with header; probably integer too big for a field. + return tw.err + } + + _, tw.err = tw.w.Write(header) + + return tw.err +} + +// Write writes to the current entry in the tar archive. +// Write returns the error ErrWriteTooLong if more than +// hdr.Size bytes are written after WriteHeader. +func (tw *Writer) Write(b []byte) (n int, err os.Error) { + if tw.closed { + err = ErrWriteTooLong + return + } + overwrite := false + if int64(len(b)) > tw.nb { + b = b[0:tw.nb] + overwrite = true + } + n, err = tw.w.Write(b) + tw.nb -= int64(n) + if err == nil && overwrite { + err = ErrWriteTooLong + return + } + tw.err = err + return +} + +// Close closes the tar archive, flushing any unwritten +// data to the underlying writer. +func (tw *Writer) Close() os.Error { + if tw.err != nil || tw.closed { + return tw.err + } + tw.Flush() + tw.closed = true + + // trailer: two zero blocks + for i := 0; i < 2; i++ { + _, tw.err = tw.w.Write(zeroBlock) + if tw.err != nil { + break + } + } + return tw.err +} diff --git a/libgo/go/archive/tar/writer_test.go b/libgo/go/archive/tar/writer_test.go new file mode 100644 index 000000000..48b891140 --- /dev/null +++ b/libgo/go/archive/tar/writer_test.go @@ -0,0 +1,154 @@ +// 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 tar + +import ( + "bytes" + "fmt" + "io" + "io/ioutil" + "testing" + "testing/iotest" +) + +type writerTestEntry struct { + header *Header + contents string +} + +type writerTest struct { + file string // filename of expected output + entries []*writerTestEntry +} + +var writerTests = []*writerTest{ + &writerTest{ + file: "testdata/writer.tar", + entries: []*writerTestEntry{ + &writerTestEntry{ + header: &Header{ + Name: "small.txt", + Mode: 0640, + Uid: 73025, + Gid: 5000, + Size: 5, + Mtime: 1246508266, + Typeflag: '0', + Uname: "dsymonds", + Gname: "eng", + }, + contents: "Kilts", + }, + &writerTestEntry{ + header: &Header{ + Name: "small2.txt", + Mode: 0640, + Uid: 73025, + Gid: 5000, + Size: 11, + Mtime: 1245217492, + Typeflag: '0', + Uname: "dsymonds", + Gname: "eng", + }, + contents: "Google.com\n", + }, + }, + }, + // The truncated test file was produced using these commands: + // dd if=/dev/zero bs=1048576 count=16384 > /tmp/16gig.txt + // tar -b 1 -c -f- /tmp/16gig.txt | dd bs=512 count=8 > writer-big.tar + &writerTest{ + file: "testdata/writer-big.tar", + entries: []*writerTestEntry{ + &writerTestEntry{ + header: &Header{ + Name: "tmp/16gig.txt", + Mode: 0640, + Uid: 73025, + Gid: 5000, + Size: 16 << 30, + Mtime: 1254699560, + Typeflag: '0', + Uname: "dsymonds", + Gname: "eng", + }, + // no contents + }, + }, + }, +} + +// Render byte array in a two-character hexadecimal string, spaced for easy visual inspection. +func bytestr(offset int, b []byte) string { + const rowLen = 32 + s := fmt.Sprintf("%04x ", offset) + for _, ch := range b { + switch { + case '0' <= ch && ch <= '9', 'A' <= ch && ch <= 'Z', 'a' <= ch && ch <= 'z': + s += fmt.Sprintf(" %c", ch) + default: + s += fmt.Sprintf(" %02x", ch) + } + } + return s +} + +// Render a pseudo-diff between two blocks of bytes. +func bytediff(a []byte, b []byte) string { + const rowLen = 32 + s := fmt.Sprintf("(%d bytes vs. %d bytes)\n", len(a), len(b)) + for offset := 0; len(a)+len(b) > 0; offset += rowLen { + na, nb := rowLen, rowLen + if na > len(a) { + na = len(a) + } + if nb > len(b) { + nb = len(b) + } + sa := bytestr(offset, a[0:na]) + sb := bytestr(offset, b[0:nb]) + if sa != sb { + s += fmt.Sprintf("-%v\n+%v\n", sa, sb) + } + a = a[na:] + b = b[nb:] + } + return s +} + +func TestWriter(t *testing.T) { +testLoop: + for i, test := range writerTests { + expected, err := ioutil.ReadFile(test.file) + if err != nil { + t.Errorf("test %d: Unexpected error: %v", i, err) + continue + } + + buf := new(bytes.Buffer) + tw := NewWriter(iotest.TruncateWriter(buf, 4<<10)) // only catch the first 4 KB + for j, entry := range test.entries { + if err := tw.WriteHeader(entry.header); err != nil { + t.Errorf("test %d, entry %d: Failed writing header: %v", i, j, err) + continue testLoop + } + if _, err := io.WriteString(tw, entry.contents); err != nil { + t.Errorf("test %d, entry %d: Failed writing contents: %v", i, j, err) + continue testLoop + } + } + if err := tw.Close(); err != nil { + t.Errorf("test %d: Failed closing archive: %v", i, err) + continue testLoop + } + + actual := buf.Bytes() + if !bytes.Equal(expected, actual) { + t.Errorf("test %d: Incorrect result: (-=expected, +=actual)\n%v", + i, bytediff(expected, actual)) + } + } +} -- cgit v1.2.3