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#!/usr/bin/python
#
# linearize-data.py: Construct a linear, no-fork version of the chain.
#
# Copyright (c) 2013 The Bitcoin developers
# Distributed under the MIT/X11 software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
#
import json
import struct
import re
import base64
import httplib
import sys
import hashlib
MAX_OUT_SZ = 128 * 1024 * 1024
settings = {}
def uint32(x):
return x & 0xffffffffL
def bytereverse(x):
return uint32(( ((x) << 24) | (((x) << 8) & 0x00ff0000) |
(((x) >> 8) & 0x0000ff00) | ((x) >> 24) ))
def bufreverse(in_buf):
out_words = []
for i in range(0, len(in_buf), 4):
word = struct.unpack('@I', in_buf[i:i+4])[0]
out_words.append(struct.pack('@I', bytereverse(word)))
return ''.join(out_words)
def wordreverse(in_buf):
out_words = []
for i in range(0, len(in_buf), 4):
out_words.append(in_buf[i:i+4])
out_words.reverse()
return ''.join(out_words)
def calc_hdr_hash(rawblock):
blk_hdr = rawblock[:80]
hash1 = hashlib.sha256()
hash1.update(blk_hdr)
hash1_o = hash1.digest()
hash2 = hashlib.sha256()
hash2.update(hash1_o)
hash2_o = hash2.digest()
return hash2_o
def calc_hash_str(rawblock):
hash = calc_hdr_hash(rawblock)
hash = bufreverse(hash)
hash = wordreverse(hash)
hash_str = hash.encode('hex')
return hash_str
def get_block_hashes(settings):
blkindex = []
f = open(settings['hashlist'], "r")
for line in f:
line = line.rstrip()
blkindex.append(line)
print("Read " + str(len(blkindex)) + " hashes")
return blkindex
def mkblockset(blkindex):
blkmap = {}
for hash in blkindex:
blkmap[hash] = True
return blkmap
def copydata(settings, blkindex, blkset):
inFn = 0
inF = None
outFn = 0
outsz = 0
outF = None
blkCount = 0
fileOutput = True
if 'output' in settings:
fileOutput = False
while True:
if not inF:
fname = "%s/blk%05d.dat" % (settings['input'], inFn)
print("Input file" + fname)
inF = open(fname, "rb")
inhdr = inF.read(8)
if (not inhdr or (inhdr[0] == "\0")):
inF.close()
inF = None
inFn = inFn + 1
continue
inMagic = inhdr[:4]
if (inMagic != settings['netmagic']):
print("Invalid magic:" + inMagic)
return
inLenLE = inhdr[4:]
su = struct.unpack("<I", inLenLE)
inLen = su[0]
rawblock = inF.read(inLen)
hash_str = calc_hash_str(rawblock)
if not hash_str in blkset:
print("Skipping unknown block " + hash_str)
continue
if not fileOutput and ((outsz + inLen) > MAX_OUT_SZ):
outF.close()
outF = None
outFn = outFn + 1
outsz = 0
if not outF:
if fileOutput:
fname = settings['output_file']
else:
fname = "%s/blk%05d.dat" % (settings['output'], outFn)
print("Output file" + fname)
outF = open(fname, "wb")
outF.write(inhdr)
outF.write(rawblock)
outsz = outsz + inLen + 8
blkCount = blkCount + 1
if (blkCount % 1000) == 0:
print("Wrote " + str(blkCount) + " blocks")
if __name__ == '__main__':
if len(sys.argv) != 2:
print "Usage: linearize-data.py CONFIG-FILE"
sys.exit(1)
f = open(sys.argv[1])
for line in f:
# skip comment lines
m = re.search('^\s*#', line)
if m:
continue
# parse key=value lines
m = re.search('^(\w+)\s*=\s*(\S.*)$', line)
if m is None:
continue
settings[m.group(1)] = m.group(2)
f.close()
if 'netmagic' not in settings:
settings['netmagic'] = 'f9beb4d9'
if 'input' not in settings:
settings['input'] = 'input'
if 'hashlist' not in settings:
settings['hashlist'] = 'hashlist.txt'
settings['netmagic'] = settings['netmagic'].decode('hex')
if 'output_file' not in settings and 'output' not in settings:
print("Missing output file / directory")
sys.exit(1)
blkindex = get_block_hashes(settings)
blkset = mkblockset(blkindex)
if not "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f" in blkset:
print("not found")
else:
copydata(settings, blkindex, blkset)
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