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mistydemeo joshvarga xushiwei gumpyoung qwerty22121998 winnux gunnsth phaag nigaea sefi2 unidoc jedrzejj rio198 samuel isgasho alenafedyaeva chennqqi

mscfb's Issues

panic on govdocs file

A file in the govdocs corpus triggers a traversal bug that blows the stack. Reported by @euanc

runtime: goroutine stack exceeds 1000000000-byte limit
fatal error: stack overflow

runtime stack:
runtime.throw(0x84c044, 0xe)
	/home/travis/.gimme/versions/go1.12.9.linux.amd64/src/runtime/panic.go:617 +0x72
runtime.newstack()
	/home/travis/.gimme/versions/go1.12.9.linux.amd64/src/runtime/stack.go:1041 +0x6f0
runtime.morestack()
	/home/travis/.gimme/versions/go1.12.9.linux.amd64/src/runtime/asm_amd64.s:429 +0x8f

goroutine 10 [running]:
github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb.(*Reader).traverse.func1(0x0, 0xbdbcf8, 0x0, 0x0)
	/home/travis/gopath/src/github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb/file.go:150 +0x3fb fp=0xc024000390 sp=0xc024000388 pc=0x6dcfdb
github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb.(*Reader).traverse.func1(0x0, 0xbdbcf8, 0x0, 0x0)
	/home/travis/gopath/src/github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb/file.go:157 +0x3d5 fp=0xc024000430 sp=0xc024000390 pc=0x6dcfb5
github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb.(*Reader).traverse.func1(0x0, 0xbdbcf8, 0x0, 0x0)
	/home/travis/gopath/src/github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb/file.go:157 +0x3d5 fp=0xc0240004d0 sp=0xc024000430 pc=0x6dcfb5
github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb.(*Reader).traverse.func1(0x0, 0xbdbcf8, 0x0, 0x0)
	/home/travis/gopath/src/github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb/file.go:157 +0x3d5 fp=0xc024000570 sp=0xc0240004d0 pc=0x6dcfb5
github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb.(*Reader).traverse.func1(0x0, 0xbdbcf8, 0x0, 0x0)
	/home/travis/gopath/src/github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb/file.go:157 +0x3d5 fp=0xc024000610 sp=0xc024000570 pc=0x6dcfb5
github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb.(*Reader).traverse.func1(0x0, 0xbdbcf8, 0x0, 0x0)
	/home/travis/gopath/src/github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb/file.go:157 +0x3d5 fp=0xc0240006b0 sp=0xc024000610 pc=0x6dcfb5
github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb.(*Reader).traverse.func1(0x0, 0xbdbcf8, 0x0, 0x0)
	/home/travis/gopath/src/github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb/file.go:157 +0x3d5 fp=0xc024000750 sp=0xc0240006b0 pc=0x6dcfb5
github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb.(*Reader).traverse.func1(0x0, 0xbdbcf8, 0x0, 0x0)
	/home/travis/gopath/src/github.com/richardlehane/siegfried/vendor/github.com/richardlehane/mscfb/file.go:157 +0x3d5 fp=0xc0240007f0 sp=0xc024000750 pc=0x6dcfb5

Ability to modify content in a stream

I'm in the middle of trying to transition some code that I have written in C/C++ over to go and one of the pieces that I have is something that will go into the file and turn off macros in .doc files so as to make them safer to process in ms word. In order to do this, I merely go into the doc file and flip the length of the micro section to be 0 so that word no longer picks up the macros.

To enable this in go I would need the ability to be able to modify streams. I'm wondering if you would be open to the idea of having File object allow overwriting (not appending as that sounds much more complicated).

How To Ouptput doc worddocuemt sector?

as you code

if entry.Name == "WordDocument" {
	fmt.Println(buf[:i])
        fmt.Println(string(buf[:i]))
}

will output unknow code ,

I expect output person read string or text

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