boolean ber_read_integer(STREAM* s, uint32* value)
{
int length;
ber_read_universal_tag(s, BER_TAG_INTEGER, false);
ber_read_length(s, &length);
if (value == NULL)
{
stream_seek(s, length);
return true;
}
if (length == 1)
stream_read_uint8(s, *value);
else if (length == 2)
stream_read_uint16_be(s, *value);
else if (length == 3)
{
uint8 byte;
stream_read_uint8(s, byte);
stream_read_uint16_be(s, *value);
*value += (byte << 16);
}
else if (length == 4)
stream_read_uint32_be(s, *value);
else
return false;
return true;
}
void ber_read_length(STREAM* s, int* length)
{
uint8 byte;
stream_read_uint8(s, byte);
if (byte & 0x80)
{
byte &= ~(0x80);
if (byte == 1)
stream_read_uint8(s, *length);
if (byte == 2)
stream_read_uint16_be(s, *length);
}
else
{
*length = byte;
}
}
uint16
tpkt_read_header(STREAM* s)
{
uint8 version;
uint16 length;
stream_peek_uint8(s, version);
if (version == 3)
{
stream_seek(s, 2);
stream_read_uint16_be(s, length);
}
else
{
/* not a TPKT header */
length = 0;
}
return length;
}
