import collections
import struct
import sys
def ReadFile(filename, encoding):
  mode = 'rb' if encoding == 0 else 'rU'
  with open(filename, mode) as f:
    data = f.read()
  if encoding not in (0, 1):
    data = data.decode(encoding)
  return data

PACK_FILE_VERSION = 4
HEADER_LENGTH = 2 * 4 + 1  # Two uint32s. (file version, number of entries) and
                           # one uint8 (encoding of text resources)
def UnpackDataPack(input_file):
  """Reads a data pack file and returns a dictionary."""
  data = ReadFile(input_file, 0)
  original_data = data

  # Read the header.
  version, num_entries, encoding = struct.unpack("<IIB", data[:HEADER_LENGTH])
  if version != PACK_FILE_VERSION:
    print "Wrong file version in ", input_file
    raise WrongFileVersion

  resources = {}
  if num_entries == 0:
    return DataPackCo