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flate: Fix reset with dictionary on custom window encodes #912

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merged 1 commit into from
Jan 19, 2024
Merged

flate: Fix reset with dictionary on custom window encodes #912

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2 changes: 1 addition & 1 deletion flate/deflate.go
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Original file line number Diff line number Diff line change
Expand Up @@ -212,7 +212,7 @@ func (d *compressor) writeBlockSkip(tok *tokens, index int, eof bool) error {
// Should only be used after a start/reset.
func (d *compressor) fillWindow(b []byte) {
// Do not fill window if we are in store-only or huffman mode.
if d.level <= 0 {
if d.level <= 0 && d.level > -MinCustomWindowSize {
return
}
if d.fast != nil {
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8 changes: 8 additions & 0 deletions flate/deflate_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -538,6 +538,14 @@ func TestWriterReset(t *testing.T) {
return w2, nil
})
}
testResetOutput(t, fmt.Sprint("dict-reset-window"), func(w io.Writer) (*Writer, error) {
w2, err := NewWriterWindow(nil, 1024)
if err != nil {
return w2, err
}
w2.ResetDict(w, dict)
return w2, nil
})
}

func testResetOutput(t *testing.T, name string, newWriter func(w io.Writer) (*Writer, error)) {
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