From 5382bcf8cd23c36a435c29080770a79b5e28af42 Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Mon, 13 Aug 2012 19:11:05 +0200
Subject: Multiple blocks per file

Change the block storage layer again, this time with multiple files
per block, but tracked by txindex.dat database entries. The file
format is exactly the same as the earlier blk00001.dat, but with
smaller files (128 MiB for now).

The database entries track how many bytes each block file already
uses, how many blocks are in it, which range of heights is present
and which range of dates.
---
 src/db.cpp | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'src/db.cpp')

diff --git a/src/db.cpp b/src/db.cpp
index cef395c444..53be48cb0f 100644
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -546,6 +546,22 @@ bool CTxDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
     return Write(make_pair(string("blockindex"), blockindex.GetBlockHash()), blockindex);
 }
 
+bool CTxDB::WriteBlockFileInfo(int nFile, const CBlockFileInfo &info) {
+    return Write(make_pair(string("blockfile"), nFile), info);
+}
+
+bool CTxDB::ReadBlockFileInfo(int nFile, CBlockFileInfo &info) {
+    return Read(make_pair(string("blockfile"), nFile), info);
+}
+
+bool CTxDB::WriteLastBlockFile(int nFile) {
+    return Write(string("lastblockfile"), nFile);
+}
+
+bool CTxDB::ReadLastBlockFile(int &nFile) {
+    return Read(string("lastblockfile"), nFile);
+}
+
 bool CTxDB::ReadHashBestChain(uint256& hashBestChain)
 {
     return Read(string("hashBestChain"), hashBestChain);
@@ -609,6 +625,12 @@ bool CTxDB::LoadBlockIndex()
         pindex->bnChainWork = (pindex->pprev ? pindex->pprev->bnChainWork : 0) + pindex->GetBlockWork();
     }
 
+    // Load block file info
+    ReadLastBlockFile(nLastBlockFile);
+    printf("LoadBlockIndex(): last block file = %i\n", nLastBlockFile);
+    if (ReadBlockFileInfo(nLastBlockFile, infoLastBlockFile))
+        printf("LoadBlockIndex(): last block file: %s\n", infoLastBlockFile.ToString().c_str());
+ 
     // Load hashBestChain pointer to end of best chain
     if (!ReadHashBestChain(hashBestChain))
     {
@@ -788,7 +810,8 @@ bool CTxDB::LoadBlockIndexGuts()
             pindexNew->pprev          = InsertBlockIndex(diskindex.hashPrev);
             pindexNew->pnext          = InsertBlockIndex(diskindex.hashNext);
             pindexNew->nHeight        = diskindex.nHeight;
-            pindexNew->nAlternative   = diskindex.nAlternative;
+            pindexNew->pos            = diskindex.pos;
+            pindexNew->nUndoPos       = diskindex.nUndoPos;
             pindexNew->nVersion       = diskindex.nVersion;
             pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
             pindexNew->nTime          = diskindex.nTime;
-- 
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