When opening a sevenzip archive, the init() method calls sr :=SevenZipReader()
but never checked if sr was nil before using it. This could cause a nil
pointer dereference when processing malformed or empty archives. Add an
explicit nil check returning errFormat early if the subreader is nil.
Also fixes a minor import grouping whitespace issue.
Vendored the sevenzip package to eliminate dependency chain:
- sevenzip -> go4.org -> 25+ Google/Cloud/telemetry packages
Changes:
- Added internal/sevenzip/ with full package source
- Inlined go4.org/readerutil into multireaderat.go
- Updated all internal imports to use bookhoard/internal/sevenzip
- Preserved .cb7 comic archive support
This reduces bloat by ~4.9 MB and removes unused telemetry
dependencies while maintaining all functionality.
john-okeefe