1 files changed, 53 insertions, 0 deletions
diff --git a/vendor/maunium.net/go/mautrix/crypto/goolm/libolmpickle/unpickle.go b/vendor/maunium.net/go/mautrix/crypto/goolm/libolmpickle/unpickle.go
new file mode 100644
index 0000000..dbd275a
--- /dev/null
+++ b/vendor/maunium.net/go/mautrix/crypto/goolm/libolmpickle/unpickle.go
@@ -0,0 +1,53 @@
+package libolmpickle
+
+import (
+	"fmt"
+
+	"maunium.net/go/mautrix/crypto/olm"
+)
+
+func isZeroByteSlice(bytes []byte) bool {
+	b := byte(0)
+	for _, s := range bytes {
+		b |= s
+	}
+	return b == 0
+}
+
+func UnpickleUInt8(value []byte) (uint8, int, error) {
+	if len(value) < 1 {
+		return 0, 0, fmt.Errorf("unpickle uint8: %w", olm.ErrValueTooShort)
+	}
+	return value[0], 1, nil
+}
+
+func UnpickleBool(value []byte) (bool, int, error) {
+	if len(value) < 1 {
+		return false, 0, fmt.Errorf("unpickle bool: %w", olm.ErrValueTooShort)
+	}
+	return value[0] != uint8(0x00), 1, nil
+}
+
+func UnpickleBytes(value []byte, length int) ([]byte, int, error) {
+	if len(value) < length {
+		return nil, 0, fmt.Errorf("unpickle bytes: %w", olm.ErrValueTooShort)
+	}
+	resp := value[:length]
+	if isZeroByteSlice(resp) {
+		return nil, length, nil
+	}
+	return resp, length, nil
+}
+
+func UnpickleUInt32(value []byte) (uint32, int, error) {
+	if len(value) < 4 {
+		return 0, 0, fmt.Errorf("unpickle uint32: %w", olm.ErrValueTooShort)
+	}
+	var res uint32
+	count := 0
+	for i := 3; i >= 0; i-- {
+		res |= uint32(value[count]) << (8 * i)
+		count++
+	}
+	return res, 4, nil
+}