Binary file parsing with Python












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Please, can anyone advice how to rise python script speed. I know that the best way to encrease performance is to write this on C or C++, but what about Python.



The script parses Bitcoin database (blkXXXXX.dat) files directly from raw binary to txt human readable view. And I think about how to encrease the speed of processing.



Example cut from code (full code avaible here):



import os
import hashlib

def reverse(input):
L = len(input)
if (L % 2) != 0:
return None
else:
Res = ''
L = L // 2
for i in range(L):
T = input[i*2] + input[i*2+1]
Res = T + Res
T = ''
return (Res);

f = open('blk01234.dat','rb')
tmpHex = ''
fSize = os.path.getsize(t)
while f.tell() != fSize:
for j in range(4):
b = f.read(1)
b = b.encode('hex').upper()
tmpHex = b + tmpHex
tmpHex = ''
for j in range(4):
b = f.read(1)
b = b.encode('hex').upper()
tmpHex = b + tmpHex
resList.append('Block size = ' + tmpHex)
tmpHex = ''
tmpPos3 = f.tell()
while f.tell() != tmpPos3 + 80:
b = f.read(1)
b = b.encode('hex').upper()
tmpHex = tmpHex + b
tmpHex = tmpHex.decode('hex')
tmpHex = hashlib.new('sha256', tmpHex).digest()
tmpHex = hashlib.new('sha256', tmpHex).digest()
tmpHex = tmpHex.encode('hex')
tmpHex = tmpHex.upper()
tmpHex = reverse(tmpHex)
resList.append('SHA256 hash of the current block hash = ' + tmpHex)
f.seek(tmpPos3,0)
tmpHex = ''
for j in range(4):
b = f.read(1)
b = b.encode('hex').upper()
tmpHex = b + tmpHex
resList.append('Version number = ' + tmpHex)
tmpHex = ''
#.....next part of code
f.close()
f = open('blk01234.txt','w')
for j in resList:
f.write(j + 'n')
f.close()


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    $begingroup$


    Please, can anyone advice how to rise python script speed. I know that the best way to encrease performance is to write this on C or C++, but what about Python.



    The script parses Bitcoin database (blkXXXXX.dat) files directly from raw binary to txt human readable view. And I think about how to encrease the speed of processing.



    Example cut from code (full code avaible here):



    import os
    import hashlib

    def reverse(input):
    L = len(input)
    if (L % 2) != 0:
    return None
    else:
    Res = ''
    L = L // 2
    for i in range(L):
    T = input[i*2] + input[i*2+1]
    Res = T + Res
    T = ''
    return (Res);

    f = open('blk01234.dat','rb')
    tmpHex = ''
    fSize = os.path.getsize(t)
    while f.tell() != fSize:
    for j in range(4):
    b = f.read(1)
    b = b.encode('hex').upper()
    tmpHex = b + tmpHex
    tmpHex = ''
    for j in range(4):
    b = f.read(1)
    b = b.encode('hex').upper()
    tmpHex = b + tmpHex
    resList.append('Block size = ' + tmpHex)
    tmpHex = ''
    tmpPos3 = f.tell()
    while f.tell() != tmpPos3 + 80:
    b = f.read(1)
    b = b.encode('hex').upper()
    tmpHex = tmpHex + b
    tmpHex = tmpHex.decode('hex')
    tmpHex = hashlib.new('sha256', tmpHex).digest()
    tmpHex = hashlib.new('sha256', tmpHex).digest()
    tmpHex = tmpHex.encode('hex')
    tmpHex = tmpHex.upper()
    tmpHex = reverse(tmpHex)
    resList.append('SHA256 hash of the current block hash = ' + tmpHex)
    f.seek(tmpPos3,0)
    tmpHex = ''
    for j in range(4):
    b = f.read(1)
    b = b.encode('hex').upper()
    tmpHex = b + tmpHex
    resList.append('Version number = ' + tmpHex)
    tmpHex = ''
    #.....next part of code
    f.close()
    f = open('blk01234.txt','w')
    for j in resList:
    f.write(j + 'n')
    f.close()


    Is this style of programming is good?









    share







    New contributor




    Norman Volt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      0












      0








      0





      $begingroup$


      Please, can anyone advice how to rise python script speed. I know that the best way to encrease performance is to write this on C or C++, but what about Python.



      The script parses Bitcoin database (blkXXXXX.dat) files directly from raw binary to txt human readable view. And I think about how to encrease the speed of processing.



      Example cut from code (full code avaible here):



      import os
      import hashlib

      def reverse(input):
      L = len(input)
      if (L % 2) != 0:
      return None
      else:
      Res = ''
      L = L // 2
      for i in range(L):
      T = input[i*2] + input[i*2+1]
      Res = T + Res
      T = ''
      return (Res);

      f = open('blk01234.dat','rb')
      tmpHex = ''
      fSize = os.path.getsize(t)
      while f.tell() != fSize:
      for j in range(4):
      b = f.read(1)
      b = b.encode('hex').upper()
      tmpHex = b + tmpHex
      tmpHex = ''
      for j in range(4):
      b = f.read(1)
      b = b.encode('hex').upper()
      tmpHex = b + tmpHex
      resList.append('Block size = ' + tmpHex)
      tmpHex = ''
      tmpPos3 = f.tell()
      while f.tell() != tmpPos3 + 80:
      b = f.read(1)
      b = b.encode('hex').upper()
      tmpHex = tmpHex + b
      tmpHex = tmpHex.decode('hex')
      tmpHex = hashlib.new('sha256', tmpHex).digest()
      tmpHex = hashlib.new('sha256', tmpHex).digest()
      tmpHex = tmpHex.encode('hex')
      tmpHex = tmpHex.upper()
      tmpHex = reverse(tmpHex)
      resList.append('SHA256 hash of the current block hash = ' + tmpHex)
      f.seek(tmpPos3,0)
      tmpHex = ''
      for j in range(4):
      b = f.read(1)
      b = b.encode('hex').upper()
      tmpHex = b + tmpHex
      resList.append('Version number = ' + tmpHex)
      tmpHex = ''
      #.....next part of code
      f.close()
      f = open('blk01234.txt','w')
      for j in resList:
      f.write(j + 'n')
      f.close()


      Is this style of programming is good?









      share







      New contributor




      Norman Volt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.







      $endgroup$




      Please, can anyone advice how to rise python script speed. I know that the best way to encrease performance is to write this on C or C++, but what about Python.



      The script parses Bitcoin database (blkXXXXX.dat) files directly from raw binary to txt human readable view. And I think about how to encrease the speed of processing.



      Example cut from code (full code avaible here):



      import os
      import hashlib

      def reverse(input):
      L = len(input)
      if (L % 2) != 0:
      return None
      else:
      Res = ''
      L = L // 2
      for i in range(L):
      T = input[i*2] + input[i*2+1]
      Res = T + Res
      T = ''
      return (Res);

      f = open('blk01234.dat','rb')
      tmpHex = ''
      fSize = os.path.getsize(t)
      while f.tell() != fSize:
      for j in range(4):
      b = f.read(1)
      b = b.encode('hex').upper()
      tmpHex = b + tmpHex
      tmpHex = ''
      for j in range(4):
      b = f.read(1)
      b = b.encode('hex').upper()
      tmpHex = b + tmpHex
      resList.append('Block size = ' + tmpHex)
      tmpHex = ''
      tmpPos3 = f.tell()
      while f.tell() != tmpPos3 + 80:
      b = f.read(1)
      b = b.encode('hex').upper()
      tmpHex = tmpHex + b
      tmpHex = tmpHex.decode('hex')
      tmpHex = hashlib.new('sha256', tmpHex).digest()
      tmpHex = hashlib.new('sha256', tmpHex).digest()
      tmpHex = tmpHex.encode('hex')
      tmpHex = tmpHex.upper()
      tmpHex = reverse(tmpHex)
      resList.append('SHA256 hash of the current block hash = ' + tmpHex)
      f.seek(tmpPos3,0)
      tmpHex = ''
      for j in range(4):
      b = f.read(1)
      b = b.encode('hex').upper()
      tmpHex = b + tmpHex
      resList.append('Version number = ' + tmpHex)
      tmpHex = ''
      #.....next part of code
      f.close()
      f = open('blk01234.txt','w')
      for j in resList:
      f.write(j + 'n')
      f.close()


      Is this style of programming is good?







      performance





      share







      New contributor




      Norman Volt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.










      share







      New contributor




      Norman Volt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.








      share



      share






      New contributor




      Norman Volt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      asked 3 mins ago









      Norman VoltNorman Volt

      1011




      1011




      New contributor




      Norman Volt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





      New contributor





      Norman Volt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






      Norman Volt is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






















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