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offset for frametype bug fixed

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Tom Early committed 2021-12-05 20:34:36 -07:00
1 parent 88a19fa7ec
commit 5ecdd733fa
1 file changed
+2 -2
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reflector/M17Protocol.cpp
+2 -2
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@@ -351,8 +351,8 @@ bool CM17Protocol::IsValidDvPacket(const CBuffer &Buffer, std::unique_ptr<CDvHea
{
uint8_t tag[] = { 'M', '1', '7', ' ' };
if ( (Buffer.size() == sizeof(SM17Frame)) && (0 == Buffer.Compare(tag, sizeof(tag))) && (0x4U == (0x1CU & Buffer[13])) )
// Buffer[13] is the lsb byte of the frametype. 0x4 means payload contains Codec2 voice data and there is no encryption.
if ( (Buffer.size() == sizeof(SM17Frame)) && (0 == Buffer.Compare(tag, sizeof(tag))) && (0x4U == (0x1CU & Buffer[19])) )
// Buffer[19] is the lsb byte of the frametype. 0x4 means payload contains Codec2 voice data and there is no encryption.
// the 0x1CU mask just lets us see the encryptions bytes (must be zero) and the msb of the payload type (must be set)
{
// Make the M17 header