Commit Graph

5 Commits

Author SHA1 Message Date
Piotr Jastrzebski
b602dea726 Add signed_vint::serialized_size_from_first_byte
Signed-off-by: Piotr Jastrzebski <piotr@scylladb.com>
2018-05-09 11:41:00 +02:00
Vladimir Krivopalov
a95664be08 Add building blocks for writing data in SSTables 3.0 format.
For #1969.

Signed-off-by: Vladimir Krivopalov <vladimir@scylladb.com>
2018-04-26 14:34:20 -07:00
Piotr Jastrzebski
e423529077 core: add unsigned_vint::serialized_size_from_first_byte
This method takes first byte and determins how many bytes
are used to represent an unsigned variant integer.

Signed-off-by: Piotr Jastrzebski <piotr@scylladb.com>
2018-04-16 20:12:03 +02:00
Piotr Jastrzebski
190cdd27f0 core: add #pragma once to vint-serialization.hh
Signed-off-by: Piotr Jastrzebski <piotr@scylladb.com>
2018-04-10 20:09:40 +02:00
Jesse Haber-Kucharsky
91dab1d998 CQL native protocol: Add support for vint serialization
Version 5 of the native protocol for CQL [1] adds the `vint` and `unsigned vint`
types.

An unsigned integer encoded as a `vint` has a variable size based on the
magnitude of the value. The first byte indicates the total number of bytes.

For signed integers, a "zig-zag" encoding scheme ensures that small negative
values are encoded as short-length `vint`s (0 -> 0, -1 -> 1, 1 -> 2, 2 -> 3, -2
-> 4, etc).

[1] https://github.com/apache/cassandra/blob/trunk/doc/native_protocol_v5.spec
2017-08-10 14:11:30 -04:00