comdoc writeat: negative offset

[gabriel-vasile]

I'm not sure if this a bug in library code or a problem with the file that I used for test.

package main

import (
    "fmt"

    "github.com/sassoftware/relic/v7/lib/comdoc"
)

func main() {
    doc, err := comdoc.WritePath("xls.xls")
    if err != nil {
        fmt.Println(err)
    }

    if err := doc.AddFile("filename", []byte{1, 2, 3}); err != nil {
        fmt.Println(err)
    }
}

expected: doc.AddFile returns nil what happened: doc.AddFile returns writeat xls.xls: negative offset

xls.xls

[mtharp]

relic's comdoc package really only supports MSI files, and even then just the bare minimum to store and validate signatures. I'm happy to accept pull requests if they don't interfere with the main functionality but unfortunately I don't have time to chase down issues myself, sorry!