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Add a BlockImporter tool to examples.

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Matt Corallo 2012-08-12 02:44:08 +02:00 committed by Mike Hearn
parent bf11bf08c3
commit 282b58c5ea
1 changed files with 76 additions and 0 deletions
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examples/src/main/java/com/google/bitcoin/examples/BlockImporter.java Normal file
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/*
* Copyright 2012 Matt Corallo.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.bitcoin.examples;
import com.google.bitcoin.core.Block;
import com.google.bitcoin.core.FullPrunedBlockChain;
import com.google.bitcoin.core.NetworkParameters;
import com.google.bitcoin.core.Utils;
import com.google.bitcoin.store.FullPrunedBlockStore;
import com.google.bitcoin.store.H2FullPrunedBlockStore;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
/**
* This class reads block files stored in the reference/Satoshi clients format. This is simply a way to concatenate
* blocks together. Importing block data with this tool can be a lot faster than syncing over the network, if you
* have the files available.
*/
public class BlockImporter {
public static void main(String[] args) throws Exception {
NetworkParameters params = NetworkParameters.prodNet();
FullPrunedBlockStore store = new H2FullPrunedBlockStore(params, "toy-full.blockchain", 100);
FullPrunedBlockChain chain = new FullPrunedBlockChain(params, store);
String defaultDataDir;
if (System.getProperty("os.name").toLowerCase().indexOf("win") >= 0) {
defaultDataDir = System.getenv("APPDATA") + "\\.bitcoin/";
} else {
defaultDataDir = System.getProperty("user.home") + "/.bitcoin/";
}
// TODO: Move this to a library function
FileInputStream stream = new FileInputStream(new File(defaultDataDir + "blk0001.dat"));
int i = 0;
while (stream.available() > 0) {
try {
while(stream.read() != ((params.packetMagic >>> 24) & 0xff) || stream.read() != ((params.packetMagic >>> 16) & 0xff) ||
stream.read() != ((params.packetMagic >>> 8) & 0xff) || stream.read() != (params.packetMagic & 0xff))
;
} catch (IOException e) {
break;
}
byte[] bytes = new byte[4];
stream.read(bytes, 0, 4);
long size = Utils.readUint32BE(Utils.reverseBytes(bytes), 0);
if (size > Block.MAX_BLOCK_SIZE || size <= 0)
continue;
bytes = new byte[(int) size];
stream.read(bytes, 0, (int)size);
Block block = new Block(params, bytes);
if (store.get(block.getHash()) == null)
chain.add(block);
if (i % 10000 == 0)
System.out.println(i);
i++;
}
System.out.println("Imported " + chain.getChainHead().getHeight() + " blocks.");
}
}