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protocol.h: Make enums in GetDataMsg concrete values

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This concretizes the numbers and adds a comment to make it clear that
these numbers are fixed by the protocol, and may avoid people forgetting
to claim numbers in the future (e.g. issue #8500).

Also gets rid of a weird unused `MSG_TYPE_MAX` in the middle of the
enumeration (thanks @paveljanik for noticing).
This commit is contained in:
Wladimir J. van der Laan 2016-10-04 17:55:12 +02:00
parent 2c09a5209a
commit 1df311118d
1 changed files with 12 additions and 8 deletions
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20
src/protocol.h
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@ -312,20 +312,24 @@ public:
unsigned int nTime;
};
/** getdata message types */
/** getdata message type flags */
const uint32_t MSG_WITNESS_FLAG = 1 << 30;
const uint32_t MSG_TYPE_MASK = 0xffffffff >> 2;
/** getdata / inv message types.
* These numbers are defined by the protocol. When adding a new value, be sure
* to mention it in the respective BIP.
*/
enum GetDataMsg
{
UNDEFINED = 0,
MSG_TX,
MSG_BLOCK,
MSG_TYPE_MAX = MSG_BLOCK,
MSG_TX = 1,
MSG_BLOCK = 2,
// The following can only occur in getdata. Invs always use TX or BLOCK.
MSG_FILTERED_BLOCK,
MSG_CMPCT_BLOCK,
MSG_WITNESS_BLOCK = MSG_BLOCK | MSG_WITNESS_FLAG,
MSG_WITNESS_TX = MSG_TX | MSG_WITNESS_FLAG,
MSG_FILTERED_BLOCK = 3, //!< Defined in BIP37
MSG_CMPCT_BLOCK = 4, //!< Defined in BIP152
MSG_WITNESS_BLOCK = MSG_BLOCK | MSG_WITNESS_FLAG, //!< Defined in BIP144
MSG_WITNESS_TX = MSG_TX | MSG_WITNESS_FLAG, //!< Defined in BIP144
MSG_FILTERED_WITNESS_BLOCK = MSG_FILTERED_BLOCK | MSG_WITNESS_FLAG,
};