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refactor: use _MiB consistently for Mebibyte conversions

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Replace hard-coded MiB byte conversions (e.g. `1024*1024`, `1<<20`, `1048576`) with the existing `_MiB` literal to improve readability and avoid repeating constants.
In the few spots where arithmetic involves signed values, the result is identical to the previous code assuming those quantities never turn negative.

Also switch to brace init on every declaration assigned from `_MiB`/`_GiB` literals so a future oversized value (e.g. `unsigned int x{4096_MiB}`) becomes a compile error through the C++11 narrowing check instead of silently truncating.

Extend unit tests to cover the 32-bit `size_t` overflow boundary and to assert equivalence for integer and floating-point conversions.

Co-authored-by: MarcoFalke <*~=`'#}+{/-|&$^_@721217.xyz>
Co-authored-by: w0xlt <94266259+w0xlt@users.noreply.github.com>
This commit is contained in:
Lőrinc
2026-01-28 14:38:24 +01:00
parent b3edd30aa2
commit af0ee28eb6
36 changed files with 138 additions and 82 deletions
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7
src/node/blockstorage.h
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@@ -18,6 +18,7 @@
#include <streams.h>
#include <sync.h>
#include <uint256.h>
#include <util/byte_units.h> // IWYU pragma: keep
#include <util/expected.h>
#include <util/fs.h>
#include <util/hasher.h>
@@ -116,11 +117,11 @@ using kernel::CBlockFileInfo;
using kernel::BlockTreeDB;
/** The pre-allocation chunk size for blk?????.dat files (since 0.8) */
static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB
static const unsigned int BLOCKFILE_CHUNK_SIZE{16_MiB};
/** The pre-allocation chunk size for rev?????.dat files (since 0.8) */
static const unsigned int UNDOFILE_CHUNK_SIZE = 0x100000; // 1 MiB
static const unsigned int UNDOFILE_CHUNK_SIZE{1_MiB};
/** The maximum size of a blk?????.dat file (since 0.8) */
static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB
static const unsigned int MAX_BLOCKFILE_SIZE{128_MiB};
/** Size of header written by WriteBlock before a serialized CBlock (8 bytes) */
static constexpr uint32_t STORAGE_HEADER_BYTES{std::tuple_size_v<MessageStartChars> + sizeof(unsigned int)};