88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
#include "BlobOnBlocks.h"
|
|
|
|
#include "datatreestore/DataTree.h"
|
|
#include "datanodestore/DataLeafNode.h"
|
|
#include "utils/Math.h"
|
|
#include <cmath>
|
|
|
|
using std::unique_ptr;
|
|
using std::function;
|
|
using blobstore::onblocks::datanodestore::DataLeafNode;
|
|
using blobstore::onblocks::datanodestore::DataNodeLayout;
|
|
using blockstore::Key;
|
|
|
|
namespace blobstore {
|
|
namespace onblocks {
|
|
|
|
using datatreestore::DataTree;
|
|
|
|
BlobOnBlocks::BlobOnBlocks(unique_ptr<DataTree> datatree)
|
|
: _datatree(std::move(datatree)) {
|
|
}
|
|
|
|
BlobOnBlocks::~BlobOnBlocks() {
|
|
}
|
|
|
|
uint64_t BlobOnBlocks::size() const {
|
|
return _datatree->numStoredBytes();
|
|
}
|
|
|
|
void BlobOnBlocks::resize(uint64_t numBytes) {
|
|
_datatree->resizeNumBytes(numBytes);
|
|
}
|
|
|
|
void BlobOnBlocks::traverseLeaves(uint64_t beginByte, uint64_t sizeBytes, function<void (uint64_t, DataLeafNode *leaf, uint32_t, uint32_t)> func) const {
|
|
uint64_t endByte = beginByte + sizeBytes;
|
|
assert(endByte <= size());
|
|
uint32_t firstLeaf = beginByte / _datatree->maxBytesPerLeaf();
|
|
uint32_t endLeaf = utils::ceilDivision(endByte, _datatree->maxBytesPerLeaf());
|
|
_datatree->traverseLeaves(firstLeaf, endLeaf, [&func, beginByte, endByte](DataLeafNode *leaf, uint32_t leafIndex) {
|
|
uint64_t indexOfFirstLeafByte = leafIndex * leaf->maxStoreableBytes();
|
|
uint32_t dataBegin = utils::maxZeroSubtraction(beginByte, indexOfFirstLeafByte);
|
|
uint32_t dataEnd = std::min((uint64_t)leaf->maxStoreableBytes(), endByte - indexOfFirstLeafByte);
|
|
func(indexOfFirstLeafByte, leaf, dataBegin, dataEnd-dataBegin);
|
|
});
|
|
}
|
|
|
|
void BlobOnBlocks::read(void *target, uint64_t offset, uint64_t count) const {
|
|
assert(offset <= _datatree->numStoredBytes() && offset + count <= size());
|
|
uint64_t read = tryRead(target, offset, count);
|
|
assert(read == count);
|
|
}
|
|
|
|
uint64_t BlobOnBlocks::tryRead(void *target, uint64_t offset, uint64_t count) const {
|
|
//TODO Quite inefficient to call size() here, because that has to traverse the tree
|
|
uint64_t realCount = std::max(0uL, std::min(count, size()-offset));
|
|
traverseLeaves(offset, realCount, [target, offset] (uint64_t indexOfFirstLeafByte, const DataLeafNode *leaf, uint32_t leafDataOffset, uint32_t leafDataSize) {
|
|
//TODO Simplify formula, make it easier to understand
|
|
leaf->read((uint8_t*)target + indexOfFirstLeafByte - offset + leafDataOffset, leafDataOffset, leafDataSize);
|
|
});
|
|
return realCount;
|
|
}
|
|
|
|
void BlobOnBlocks::write(const void *source, uint64_t offset, uint64_t size) {
|
|
resizeIfSmallerThan(offset + size);
|
|
traverseLeaves(offset, size, [source, offset] (uint64_t indexOfFirstLeafByte, DataLeafNode *leaf, uint32_t leafDataOffset, uint32_t leafDataSize) {
|
|
//TODO Simplify formula, make it easier to understand
|
|
leaf->write((uint8_t*)source + indexOfFirstLeafByte - offset + leafDataOffset, leafDataOffset, leafDataSize);
|
|
});
|
|
}
|
|
|
|
void BlobOnBlocks::resizeIfSmallerThan(uint64_t neededSize) {
|
|
//TODO This is inefficient, because size() and resizeNumBytes() both traverse the tree. Better: _datatree->ensureMinSize(x)
|
|
if (neededSize > size()) {
|
|
_datatree->resizeNumBytes(neededSize);
|
|
}
|
|
}
|
|
|
|
Key BlobOnBlocks::key() const {
|
|
return _datatree->key();
|
|
}
|
|
|
|
unique_ptr<DataTree> BlobOnBlocks::releaseTree() {
|
|
return std::move(_datatree);
|
|
}
|
|
|
|
}
|
|
}
|