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"""
*******************************************************************************
* BTChip Bitcoin Hardware Wallet Python API
* (c) 2014 BTChip - 1BTChip7VfTnrPra5jqci7ejnMguuHogTn
*
* 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.
********************************************************************************
"""
import decimal
import re
# from pycoin
SATOSHI_PER_COIN = decimal.Decimal(100_000_000)
COIN_PER_SATOSHI = decimal.Decimal('0.00000001')
def satoshi_to_btc(satoshi_count):
if satoshi_count == 0:
return decimal.Decimal(0)
r = satoshi_count * COIN_PER_SATOSHI
return r.normalize()
def btc_to_satoshi(btc):
return int(decimal.Decimal(btc) * SATOSHI_PER_COIN)
# /from pycoin
def writeUint32BE(value, buffer):
buffer.append((value >> 24) & 0xff)
buffer.append((value >> 16) & 0xff)
buffer.append((value >> 8) & 0xff)
buffer.append(value & 0xff)
return buffer
def writeUint32LE(value, buffer):
buffer.append(value & 0xff)
buffer.append((value >> 8) & 0xff)
buffer.append((value >> 16) & 0xff)
buffer.append((value >> 24) & 0xff)
return buffer
def writeHexAmount(value, buffer):
buffer.append(value & 0xff)
buffer.append((value >> 8) & 0xff)
buffer.append((value >> 16) & 0xff)
buffer.append((value >> 24) & 0xff)
buffer.append((value >> 32) & 0xff)
buffer.append((value >> 40) & 0xff)
buffer.append((value >> 48) & 0xff)
buffer.append((value >> 56) & 0xff)
return buffer
def writeHexAmountBE(value, buffer):
buffer.append((value >> 56) & 0xff)
buffer.append((value >> 48) & 0xff)
buffer.append((value >> 40) & 0xff)
buffer.append((value >> 32) & 0xff)
buffer.append((value >> 24) & 0xff)
buffer.append((value >> 16) & 0xff)
buffer.append((value >> 8) & 0xff)
buffer.append(value & 0xff)
return buffer
def parse_bip32_path(path):
if len(path) == 0:
return bytearray([ 0 ])
result = []
elements = path.split('/')
if len(elements) > 10:
raise BTChipException("Path too long")
for pathElement in elements:
element = re.split('\'|h|H', pathElement)
if len(element) == 1:
writeUint32BE(int(element[0]), result)
else:
writeUint32BE(0x80000000 | int(element[0]), result)
return bytearray([ len(elements) ] + result)
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