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41 lines
912 B
41 lines
912 B
4 years ago
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package ntlmssp
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import (
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"errors"
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)
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type varField struct {
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Len uint16
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MaxLen uint16
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BufferOffset uint32
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}
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func (f varField) ReadFrom(buffer []byte) ([]byte, error) {
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if len(buffer) < int(f.BufferOffset+uint32(f.Len)) {
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return nil, errors.New("Error reading data, varField extends beyond buffer")
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}
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return buffer[f.BufferOffset : f.BufferOffset+uint32(f.Len)], nil
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}
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func (f varField) ReadStringFrom(buffer []byte, unicode bool) (string, error) {
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d, err := f.ReadFrom(buffer)
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if err != nil {
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return "", err
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}
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if unicode { // UTF-16LE encoding scheme
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return fromUnicode(d)
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}
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// OEM encoding, close enough to ASCII, since no code page is specified
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return string(d), err
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}
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func newVarField(ptr *int, fieldsize int) varField {
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f := varField{
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Len: uint16(fieldsize),
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MaxLen: uint16(fieldsize),
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BufferOffset: uint32(*ptr),
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}
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*ptr += fieldsize
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return f
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}
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