Load Sapling testnet parameters into memory
This PR depends on https://github.com/zcash/librustzcash/pull/4.
The parameters are not loaded into memory if `zcashd` is configured as a mainnet node -- this is something we can change in the weeks before `2.0.0`.
Details of Sapling datatypes will be filled in later; for now, they are treated
as binary blobs.
Includes code cherry-picked from upstream commit:
7030d9eb47254499bba14f1c00abc6bf493efd91
BIP144: Serialization, hashes, relay (sender side)
Upstream serialization improvements
Cherry-picked from the following upstream PRs:
- bitcoin/bitcoin#5264
- bitcoin/bitcoin#6914
- bitcoin/bitcoin#6215
- bitcoin/bitcoin#8068
- Only the `COMPACTSIZE` wrapper commit
- bitcoin/bitcoin#8658
- bitcoin/bitcoin#8708
- Only the serializer variadics commit
- bitcoin/bitcoin#9039
- bitcoin/bitcoin#9125
- Only the first two commits (the last two block on other upstream PRs)
Part of #2074.
Dbwrapper used GetSerializeSize() to compute the size of the buffer
to preallocate. For some cases (specifically: CCoins) this requires
a costly compression call. Avoid this by just using fixed size
preallocations instead.
To get the advantages of faster GetSerializeSize() implementations
back that were removed in "Make GetSerializeSize a wrapper on top of
CSizeComputer", reintroduce them in the few places in the form of a
specialized Serialize() implementation. This actually gets us in a
better state than before, as these even get used when they're invoked
indirectly in the serialization of another object.
The CSerAction's ForRead() method does not depend on any runtime
data, so guarantee that requests to it can be optimized out by
making it constexpr.
Suggested by Cory Fields.
Remove the nType and nVersion as parameters to all serialization methods
and functions. There is only one place where it's read and has an impact
(in CAddress), and even there it does not impact any of the recursively
invoked serializers.
Instead, the few places that need nType or nVersion are changed to read
it directly from the stream object, through GetType() and GetVersion()
methods which are added to all stream classes.
Given that in default GetSerializeSize implementations created by
ADD_SERIALIZE_METHODS we're already using CSizeComputer(), get rid
of the specialized GetSerializeSize methods everywhere, and just use
CSizeComputer. This removes a lot of code which isn't actually used
anywhere.
For CCompactSize and CVarInt this actually removes a more efficient
size computing algorithm, which is brought back in a later commit.
The stream implementations had two cascading layers (the upper one
with operator<< and operator>>, and a lower one with read and write).
The lower layer's functions are never cascaded (nor should they, as
they should only be used from the higher layer), so make them return
void instead.
These changes decode valid SIGHASH types on signatures in assembly (asm) representations of scriptSig scripts.
This squashed commit incorporates substantial helpful feedback from jtimon, laanwj, and sipa.
