extractcode's behaviour and error message output on damaged archives

when running `extractcode` on `gcc-4.9` (download here https://packages.debian.org/jessie/all/gcc-4.9-source/download) extractcode fails with these error messages:

```
nakami@debian:~/Downloads/scancode-toolkit-developNEW$ ./extractcode samples/gcc-4.9-source_4.9.2-10_all.deb
Extracting archives...
[####################################]
ERROR extracting: writer-big.tar: 'Truncated tar archive'
ERROR extracting: test-trailing-junk.zip: 'Invalid central directory signature'
ERROR extracting: issue6550.gz: 'Error -3 while decompressing: too many length or distance symbols'
Extracting done.
```

with the `--verbose` flag the error messages look like this:

```
nakami@debian:~/Downloads/scancode-toolkit-developNEW$ ./extractcode --verbose samples/gcc-4.9-source_4.9.2-10_all.deb
Extracting archives...
Extracting: gcc-4.9-source_4.9.2-10_all.deb
[...]
Extracting: changelog.Debian.gz

ERROR extracting: writer-big.tar: 'Truncated tar archive'
ERROR extracting: test-trailing-junk.zip: 'Invalid central directory signature'
ERROR extracting: issue6550.gz: 'Error -3 while decompressing: too many length or distance symbols'
ERROR extracting: writer-big.tar: 'Truncated tar archive'
ERROR extracting: test-trailing-junk.zip: 'Invalid central directory signature'
ERROR extracting: issue6550.gz: 'Error -3 while decompressing: too many length or distance symbols'
ERROR extracting: writer-big.tar: 'Truncated tar archive'
ERROR extracting: test-trailing-junk.zip: 'Invalid central directory signature'
ERROR extracting: issue6550.gz: 'Error -3 while decompressing: too many length or distance symbols'
ERROR extracting: writer-big.tar: 'Truncated tar archive'
ERROR extracting: test-trailing-junk.zip: 'Invalid central directory signature'
ERROR extracting: issue6550.gz: 'Error -3 while decompressing: too many length or distance symbols'
Extracting done.
```
are you aware of this problem?
it seems that either the depth of further archives within the initial archive, the depth that those have or both depths sumed up is the problem here.