Платформа ЦРНП "Мирокод" для разработки проектов
https://git.mirocod.ru
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38 lines
793 B
38 lines
793 B
package ber |
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import ( |
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"errors" |
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"fmt" |
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"io" |
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) |
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func readHeader(reader io.Reader) (identifier Identifier, length int, read int, err error) { |
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var ( |
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c, l int |
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i Identifier |
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) |
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if i, c, err = readIdentifier(reader); err != nil { |
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return Identifier{}, 0, read, err |
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} |
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identifier = i |
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read += c |
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if l, c, err = readLength(reader); err != nil { |
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return Identifier{}, 0, read, err |
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} |
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length = l |
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read += c |
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// Validate length type with identifier (x.600, 8.1.3.2.a) |
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if length == LengthIndefinite && identifier.TagType == TypePrimitive { |
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return Identifier{}, 0, read, errors.New("indefinite length used with primitive type") |
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} |
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if length < LengthIndefinite { |
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err = fmt.Errorf("length cannot be less than %d", LengthIndefinite) |
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return |
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} |
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return identifier, length, read, nil |
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}
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