def compute_hash(self, fp, algorithm, size=None):
"""
:type fp: file
:param fp: File pointer to the file to hash. The file
pointer will be reset to the same position before the
method returns.
:type algorithm: zero-argument constructor for hash objects that
implements update() and digest() (e.g. hashlib.md5)
:type size: int
:param size: (optional) The Maximum number of bytes to read
from the file pointer (fp). This is useful when uploading
a file in multiple parts where the file is being split
in place into different parts. Less bytes may be available.
"""
hex_digest, b64_digest, data_size = compute_hash(
fp, size=size, hash_algorithm=algorithm)
# The internal implementation of compute_hash() needs to return the
# data size, but we don't want to return that value to the external
# caller because it changes the class interface (i.e. it might
# break some code), so we consume the third tuple value here and
# return the remainder of the tuple to the caller, thereby preserving
# the existing interface.
self.size = data_size
return (hex_digest, b64_digest)
def compute_hash(self, fp, algorithm, size=None):
"""
:type fp: file
:param fp: File pointer to the file to hash. The file
pointer will be reset to the same position before the
method returns.
:type algorithm: zero-argument constructor for hash objects that
implements update() and digest() (e.g. hashlib.md5)
:type size: int
:param size: (optional) The Maximum number of bytes to read
from the file pointer (fp). This is useful when uploading
a file in multiple parts where the file is being split
in place into different parts. Less bytes may be available.
"""
hex_digest, b64_digest, data_size = compute_hash(
fp, size=size, hash_algorithm=algorithm)
# The internal implementation of compute_hash() needs to return the
# data size, but we don't want to return that value to the external
# caller because it changes the class interface (i.e. it might
# break some code), so we consume the third tuple value here and
# return the remainder of the tuple to the caller, thereby preserving
# the existing interface.
self.size = data_size
return (hex_digest, b64_digest)
