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Need a 'walkTo' function. That walks as far as possible to tree

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position.
This commit is contained in:
JoelKatz
2012-01-31 15:52:44 -08:00
parent ca26a22314
commit eec4bfddff
2 changed files with 25 additions and 0 deletions
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23
SHAMap.cpp
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@@ -118,6 +118,29 @@ SHAMapLeafNode::pointer SHAMap::walkToLeaf(const uint256& id, bool create, bool
return returnLeaf(ln, modify);
}
SHAMapInnerNode::pointer SHAMap::walkTo(const SHAMapNode& id)
{ // walk down to this ID, as far as possible
SHAMapInnerNode::pointer inNode=root;
int i=0;
do
{
int branch=inNode->selectBranch(id.getNodeID());
if(branch<0) // somehow we got on the wrong branch
throw SHAMapException(InvalidNode);
if (inNode->isEmptyBranch(branch)) // we know no branches below this one
return inNode;
if(!inNode->isChildLeaf()) // this is the last inner node
return inNode;
SHAMapInnerNode::pointer next=getInner(inNode->getChildNodeID(branch), inNode->getChildHash(branch), false);
if(!next) // we don't have the next node
return inNode;
assert(next->getDepth() == (inNode->getDepth()+1));
inNode=next;
assert(i++ < SHAMapNode::leafDepth);
} while(1);
}
SHAMapLeafNode::pointer SHAMap::getLeaf(const SHAMapNode& id, const uint256& hash, bool modify)
{ // retrieve a leaf whose node hash is known
assert(!!hash);

2
SHAMap.h
View File

@@ -234,6 +234,7 @@ protected:
SHAMapLeafNode::pointer returnLeaf(SHAMapLeafNode::pointer leaf, bool modify);
SHAMapInnerNode::pointer getInner(const SHAMapNode& id, const uint256& hash, bool modify);
SHAMapInnerNode::pointer returnNode(SHAMapInnerNode::pointer node, bool modify);
SHAMapInnerNode::pointer walkTo(const SHAMapNode& id);
SHAMapItem::pointer firstBelow(SHAMapInnerNode::pointer);
SHAMapItem::pointer lastBelow(SHAMapInnerNode::pointer);
@@ -289,6 +290,7 @@ public:
void getMissingNodes(std::vector<SHAMapNode>& nodeIDs, std::vector<uint256>& hashes, int max);
bool getNodeFat(const SHAMapNode& node, std::vector<SHAMapNode>& nodeIDs,
std::list<std::vector<unsigned char> >& rawNode);
bool addRootNode(const uint256& hash, const std::vector<unsigned char>& rootNode);
bool addKnownNode(const SHAMapNode& nodeID, const std::vector<unsigned char>& rawNode);
// caution: otherMap must be accessed only by this function