65 lines
1016 B
Go
65 lines
1016 B
Go
package download
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import (
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"context"
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"errors"
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"io"
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"os"
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"github.com/mathismqn/godeez/internal/deezer"
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)
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const chunkSize = 2048
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func (d *Downloader) streamToFile(ctx context.Context, stream io.ReadCloser, outputPath string, key []byte) error {
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defer stream.Close()
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file, err := os.Create(outputPath)
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if err != nil {
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return err
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}
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defer file.Close()
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buffer := make([]byte, chunkSize)
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for chunk := 0; ; chunk++ {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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totalRead := 0
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for totalRead < chunkSize {
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n, err := stream.Read(buffer[totalRead:])
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totalRead += n
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if err != nil {
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if errors.Is(err, io.EOF) {
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break
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}
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return err
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}
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}
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if totalRead == 0 {
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break
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}
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if chunk%3 == 0 && totalRead == chunkSize {
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buffer, err = deezer.DecryptBlowfish(buffer, key)
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if err != nil {
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return err
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}
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}
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if _, err = file.Write(buffer[:totalRead]); err != nil {
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return err
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}
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if totalRead < chunkSize {
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break
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}
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}
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return nil
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}
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