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Fix flate corrupt input error when reading ZIP entries with gzran #279

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Fix flate corrupt input error when reading ZIP entries with gzran #279

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Copilot Dec 4, 2025
a4d1c15
Fix flate corrupt input error by reading entire compressed data
Copilot Dec 4, 2025
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14 changes: 3 additions & 11 deletions pkg/archive/archive_zip.go
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Original file line number Diff line number Diff line change
Expand Up @@ -94,18 +94,10 @@ func (e *gozipArchiveEntry) Read(start int64, end int64) ([]byte, error) {
defer frdr.Close()
f = frdr
} else {
e.gm.Lock()
var lastCompressedOffset int64
for _, v := range e.gi {
if v.CompressedOffset > lastCompressedOffset && v.UncompressedOffset <= start {
lastCompressedOffset = v.CompressedOffset
}
}
e.gm.Unlock()

// Read the entire compressed data - we cannot skip compressed bytes
// because deflate streams cannot be decoded from arbitrary offsets
compressedData := make([]byte, e.file.CompressedSize64)
f.(io.Seeker).Seek(lastCompressedOffset, io.SeekStart)
_, err := io.ReadFull(f, compressedData[lastCompressedOffset:])
_, err := io.ReadFull(f, compressedData)
if err != nil {
return nil, err
}
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