54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
package libolmpickle
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import (
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"fmt"
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"maunium.net/go/mautrix/crypto/goolm"
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)
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func isZeroByteSlice(bytes []byte) bool {
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b := byte(0)
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for _, s := range bytes {
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b |= s
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}
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return b == 0
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}
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func UnpickleUInt8(value []byte) (uint8, int, error) {
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if len(value) < 1 {
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return 0, 0, fmt.Errorf("unpickle uint8: %w", goolm.ErrValueTooShort)
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}
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return value[0], 1, nil
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}
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func UnpickleBool(value []byte) (bool, int, error) {
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if len(value) < 1 {
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return false, 0, fmt.Errorf("unpickle bool: %w", goolm.ErrValueTooShort)
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}
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return value[0] != uint8(0x00), 1, nil
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}
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func UnpickleBytes(value []byte, length int) ([]byte, int, error) {
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if len(value) < length {
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return nil, 0, fmt.Errorf("unpickle bytes: %w", goolm.ErrValueTooShort)
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}
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resp := value[:length]
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if isZeroByteSlice(resp) {
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return nil, length, nil
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}
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return resp, length, nil
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}
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func UnpickleUInt32(value []byte) (uint32, int, error) {
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if len(value) < 4 {
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return 0, 0, fmt.Errorf("unpickle uint32: %w", goolm.ErrValueTooShort)
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}
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var res uint32
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count := 0
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for i := 3; i >= 0; i-- {
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res |= uint32(value[count]) << (8 * i)
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count++
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}
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return res, 4, nil
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}
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