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import binascii
import os
import zlib
from git.utils import make_sha
__all__ = ('FDSha1Writer', )
#{ Routines
hex_to_bin = binascii.a2b_hex
bin_to_hex = binascii.b2a_hex
def to_hex_sha(sha):
""":return: hexified version of sha"""
if len(sha) == 40:
return sha
return bin_to_hex(sha)
def to_bin_sha(sha):
if len(sha) == 20:
return sha
return hex_to_bin(sha)
# os shortcuts
exists = os.path.exists
mkdir = os.mkdir
isdir = os.path.isdir
rename = os.rename
dirname = os.path.dirname
join = os.path.join
read = os.read
write = os.write
close = os.close
#} END Routines
#{ Classes
class FDCompressedSha1Writer(object):
"""Digests data written to it, making the sha available, then compress the
data and write it to the file descriptor
:note: operates on raw file descriptors
:note: for this to work, you have to use the close-method of this instance"""
__slots__ = ("fd", "sha1", "zip")
# default exception
exc = IOError("Failed to write all bytes to filedescriptor")
def __init__(self, fd):
self.fd = fd
self.sha1 = make_sha("")
self.zip = zlib.compressobj()
def write(self, data):
""":raise IOError: If not all bytes could be written
:return: lenght of incoming data"""
self.sha1.update(data)
cdata = self.zip.compress(data)
bytes_written = write(self.fd, cdata)
if bytes_written != len(cdata):
raise self.exc
return bytes_written
def sha(self, as_hex = False):
""":return: sha so far
:param as_hex: if True, sha will be hex-encoded, binary otherwise"""
if as_hex:
return self.sha1.hexdigest()
return self.sha1.digest()
def close(self):
remainder = self.zip.flush()
if write(self.fd, remainder) != len(remainder):
raise self.exc
return close(self.fd)
#} END classes
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