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View Code? Open in Web Editor NEWNative Go XZ decompression package
License: Other
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wstewartii rmg pombredanne kdevb0x im-kulikov machinechatllc therootcompany blacktop tomcruise81 imkos jelmervdl mbartisanxz's Issues
panic: runtime error: index out of range in bcjX86Filter
package main
import (
"bytes"
"encoding/hex"
"fmt"
"io/ioutil"
"xi2.org/x/xz"
)
func main() {
in, err := hex.DecodeString(`fd377a585a000004e6d6b4460201040021010800d2b974cbe0303030305d3030914584683bdedea84b03d83553a49173a3e51b1e5b1d4af106c1ae79ea4562760c29cd4bafb0003030303030303030303030303030303030303030303030`)
if err != nil {
panic(err)
}
r, err := xz.NewReader(bytes.NewReader(in), 0)
if err != nil {
fmt.Println(err)
}
_, err = ioutil.ReadAll(r)
if err != nil {
fmt.Println(err)
}
}panic: runtime error: index out of range [recovered]
panic: runtime error: index out of range
goroutine 1 [running]:
io/ioutil.readAll.func1(0xc82003be48)
/src/go/src/io/ioutil/ioutil.go:30 +0x11e
xi2.org/x/xz.bcjX86Filter(0xc820054070, 0xc82009a000, 0x49, 0x2000, 0x10000)
/go/src/xi2.org/x/xz/dec_bcj.go:111 +0x3eb
xi2.org/x/xz.bcjApply(0xc820054070, 0xc82009a000, 0x49, 0x2000, 0xc82003ba40)
/go/src/xi2.org/x/xz/dec_bcj.go:289 +0x8b
xi2.org/x/xz.xzDecBCJRun(0xc820054070, 0xc82009e000, 0xc82005a0c0, 0x10000)
/go/src/xi2.org/x/xz/dec_bcj.go:370 +0x4fa
xi2.org/x/xz.decBlock(0xc82009c000, 0xc82005a0c0, 0xc82007b801)
/go/src/xi2.org/x/xz/dec_stream.go:251 +0x7a
xi2.org/x/xz.decMain(0xc82009c000, 0xc82005a0c0, 0x5e)
/go/src/xi2.org/x/xz/dec_stream.go:651 +0x56b
xi2.org/x/xz.xzDecRun(0xc82009c000, 0xc82005a0c0, 0x2000)
/go/src/xi2.org/x/xz/dec_stream.go:755 +0x41
xi2.org/x/xz.(*Reader).decode(0xc8200a6000, 0xc8200a6020)
/go/src/xi2.org/x/xz/reader.go:117 +0x2c9
xi2.org/x/xz.(*Reader).Read(0xc8200a6000, 0xc8200b4000, 0x200, 0x200, 0x0, 0x0, 0x0)
/go/src/xi2.org/x/xz/reader.go:163 +0x370
bytes.(*Buffer).ReadFrom(0xc82003bda0, 0x7f0d9782d1e8, 0xc8200a6000, 0x0, 0x0, 0x0)
/src/go/src/bytes/buffer.go:173 +0x23f
io/ioutil.readAll(0x7f0d9782d1e8, 0xc8200a6000, 0x200, 0x0, 0x0, 0x0, 0x0, 0x0)
/src/go/src/io/ioutil/ioutil.go:33 +0x154
io/ioutil.ReadAll(0x7f0d9782d1e8, 0xc8200a6000, 0x0, 0x0, 0x0, 0x0, 0x0)
/src/go/src/io/ioutil/ioutil.go:42 +0x51
main.main()
/t.go:22 +0x277
exit status 2
found using https://github.com/dvyukov/go-fuzz.
403 error when accessing package
When attempting to download this package with go get it returns an error.
Input
GO111MODULE=on go get github.com/xi2/[email protected]
Output
go: downloading github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8
go get github.com/xi2/[email protected]: github.com/xi2/[email protected]: reading https://proxy.golang.org/github.com/xi2/xz/@v/v0.0.0-20171230120015-48954b6210f8.zip: 403 ruleengineerror
xi2.org is unreachable
xi2.org is currently unreachable, meaning that it's not possible to sucessfully run go get xi2.org/x/xz.
memory leak
There is a memory leak. When I decompressed all the kernel modules for analysis（about 2500 xz files）, the VmRSS occupancy increased to 200M
Wishlist: It'd be nice if docs said something about relative speed vs /usr/bin/xz
This seems like the natural first question anyone is going to have.
License
Are you able to update the license to a standard one such as MIT or Apache 2?
Complete support for all XZ filters
For full XZ support, package xz is currently missing the following features:
Support for full length filter chains (up to 4 filters)Support for the "delta" filterSupport for a non-zero start offset for BCJ filters
These features appear to be little used, but xz should support them ASAP so that package users can add "xz support" to their programs without needing to specify caveats about subformats.
Also test files should be added exercising all the above.
Support 4GB dictionary size
Package xz currently supports an LZMA2 dictionary size up to 3072 MiB, but the xz specification says it can go up to 4096 MiB - 1 B. Although unlikely in practice, this should be supported for completeness.
It'd be great to support compressing via an io.Writer
It'd be awesome if in addition to reading xz files (works awesomely, thanks a ton for your work), that it'd be able to write out .xz files.
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