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7b27e506f1
PSSH decoding probably got broken in some refactoring. system id is 16 bytes, also scalar mapper should use cloned reader to not affect reader which in the case broke reading system id bytes. Add test with playread and widevine pssh boxes Related to #282
36 lines
714 B
Go
36 lines
714 B
Go
package bitio
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import (
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"io"
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)
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// LimitReader is a bitio.Reader that reads a limited amount of bits from a bitio.Reader.
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// Similar to bytes.LimitedReader.
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type LimitReader struct {
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r Reader
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n int64
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}
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// NewLimitReader returns a new bitio.LimitReader.
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func NewLimitReader(r Reader, n int64) *LimitReader { return &LimitReader{r, n} }
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func (l *LimitReader) ReadBits(p []byte, nBits int64) (n int64, err error) {
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if l.n <= 0 {
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return 0, io.EOF
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}
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if nBits > l.n {
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nBits = l.n
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}
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n, err = l.r.ReadBits(p, nBits)
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l.n -= n
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return n, err
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}
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func (l *LimitReader) CloneReader() (Reader, error) {
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rc, err := CloneReader(l.r)
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if err != nil {
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return nil, err
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}
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return &LimitReader{r: rc, n: l.n}, nil
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}
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