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+ Version 3, 29 June 2007
+ Copyright (C) 2007 Free Software Foundation, Inc. <>
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+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
41 README.txt
@@ -0,0 +1,41 @@
+This library was created by SpiderOak, Inc. and is released under the GPLv3.
+SpiderOak zipstream module
+ is a zip archive generator based on It was created to
+generate a zip file on-the-fly for download in a (
+application. This is beneficial for when you want to provide a downloadable
+archive of a large collection of regular files, which would be infeasible to
+generate the archive prior to downloading.
+The archive is generated as an iterator of strings, which, when joined, form
+the zip archive. For example, the following code snippet would write a zip
+archive containing files from 'path' to a normal file:
+zf = open('', 'wb')
+for data in ZipStream(path):
+ zf.write(data)
+Since recent versions of support returning iterators of strings to be
+sent to the browser, to download a dynamically generated archive, you could
+use something like this snippet:
+def GET(self):
+ path = '/path/to/dir/of/files'
+ zip_filename = ''
+ web.header('Content-type' , 'application/zip')
+ web.header('Content-Disposition', 'attachment; filename="%s"' % (
+ zip_filename,))
+ return ZipStream(path)
+If the zlib module is available, ZipStream can generate compressed zip
+Contact the SpiderOak team at
+And be sure to back up your files!
@@ -0,0 +1,13 @@
+#!/usr/bin/env python
+from distutils.core import setup
+ name='zipstream',
+ version='1.0.1',
+ description='SpiderOak ZipStream Module',
+ author='SpiderOak Team',
+ author_email='',
+ url='',
+ py_modules=['zipstream'],
@@ -0,0 +1,410 @@
+Iterable ZIP archive genrator.
+Derived directly from
+import struct, os, time, sys
+import binascii
+ import zlib # We may need its compression method
+except ImportError:
+ zlib = None
+__all__ = ["ZIP_STORED", "ZIP_DEFLATED", "ZipStream"]
+ZIP64_LIMIT= (1 << 31) - 1
+# constants for Zip file compression methods
+# Other ZIP compression methods not supported
+# Here are some struct module formats for reading headers
+structEndArchive = "<4s4H2lH" # 9 items, end of archive, 22 bytes
+stringEndArchive = "PK\005\006" # magic number for end of archive record
+structCentralDir = "<4s4B4HlLL5HLl"# 19 items, central directory, 46 bytes
+stringCentralDir = "PK\001\002" # magic number for central directory
+structFileHeader = "<4s2B4HlLL2H" # 12 items, file header record, 30 bytes
+stringFileHeader = "PK\003\004" # magic number for file header
+structEndArchive64Locator = "<4slql" # 4 items, locate Zip64 header, 20 bytes
+stringEndArchive64Locator = "PK\x06\x07" # magic token for locator header
+structEndArchive64 = "<4sqhhllqqqq" # 10 items, end of archive (Zip64), 56 bytes
+stringEndArchive64 = "PK\x06\x06" # magic token for Zip64 header
+stringDataDescriptor = "PK\x07\x08" # magic number for data descriptor
+# indexes of entries in the central directory structure
+_CD_EXTRACT_SYSTEM = 4 # is this meaningful?
+_CD_TIME = 7
+_CD_DATE = 8
+_CD_CRC = 9
+# indexes of entries in the local file header structure
+_FH_EXTRACT_SYSTEM = 2 # is this meaningful?
+_FH_CRC = 7
+class ZipInfo (object):
+ """Class with attributes describing each file in the ZIP archive."""
+ __slots__ = (
+ 'orig_filename',
+ 'filename',
+ 'date_time',
+ 'compress_type',
+ 'comment',
+ 'extra',
+ 'create_system',
+ 'create_version',
+ 'extract_version',
+ 'reserved',
+ 'flag_bits',
+ 'volume',
+ 'internal_attr',
+ 'external_attr',
+ 'header_offset',
+ 'CRC',
+ 'compress_size',
+ 'file_size',
+ )
+ def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)):
+ self.orig_filename = filename # Original file name in archive
+ # Terminate the file name at the first null byte. Null bytes in file
+ # names are used as tricks by viruses in archives.
+ null_byte = filename.find(chr(0))
+ if null_byte >= 0:
+ filename = filename[0:null_byte]
+ # This is used to ensure paths in generated ZIP files always use
+ # forward slashes as the directory separator, as required by the
+ # ZIP format specification.
+ if os.sep != "/" and os.sep in filename:
+ filename = filename.replace(os.sep, "/")
+ self.filename = filename # Normalized file name
+ self.date_time = date_time # year, month, day, hour, min, sec
+ # Standard values:
+ self.compress_type = ZIP_STORED # Type of compression for the file
+ self.comment = "" # Comment for each file
+ self.extra = "" # ZIP extra data
+ if sys.platform == 'win32':
+ self.create_system = 0 # System which created ZIP archive
+ else:
+ # Assume everything else is unix-y
+ self.create_system = 3 # System which created ZIP archive
+ self.create_version = 20 # Version which created ZIP archive
+ self.extract_version = 20 # Version needed to extract archive
+ self.reserved = 0 # Must be zero
+ self.flag_bits = 0x08 # ZIP flag bits, bit 3 indicates presence of data descriptor
+ self.volume = 0 # Volume number of file header
+ self.internal_attr = 0 # Internal attributes
+ self.external_attr = 0 # External file attributes
+ # Other attributes are set by class ZipFile:
+ # header_offset Byte offset to the file header
+ # CRC CRC-32 of the uncompressed file
+ # compress_size Size of the compressed file
+ # file_size Size of the uncompressed file
+ def DataDescriptor(self):
+ if self.compress_size > ZIP64_LIMIT or self.file_size > ZIP64_LIMIT:
+ fmt = "<4slQQ"
+ else:
+ fmt = "<4slLL"
+ return struct.pack(fmt, stringDataDescriptor, self.CRC, self.compress_size, self.file_size)
+ def FileHeader(self):
+ """Return the per-file header as a string."""
+ dt = self.date_time
+ dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
+ dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
+ if self.flag_bits & 0x08:
+ # Set these to zero because we write them after the file data
+ CRC = compress_size = file_size = 0
+ else:
+ CRC = self.CRC
+ compress_size = self.compress_size
+ file_size = self.file_size
+ extra = self.extra
+ if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT:
+ # File is larger than what fits into a 4 byte integer,
+ # fall back to the ZIP64 extension
+ fmt = '<hhqq'
+ extra = extra + struct.pack(fmt,
+ 1, struct.calcsize(fmt)-4, file_size, compress_size)
+ file_size = 0xffffffff # -1
+ compress_size = 0xffffffff # -1
+ self.extract_version = max(45, self.extract_version)
+ self.create_version = max(45, self.extract_version)
+ header = struct.pack(structFileHeader, stringFileHeader,
+ self.extract_version, self.reserved, self.flag_bits,
+ self.compress_type, dostime, dosdate, CRC,
+ compress_size, file_size,
+ len(self.filename), len(extra))
+ return header + self.filename + extra
+class ZipStream:
+ """
+ """
+ def __init__(self, path, arc_path='', compression=ZIP_DEFLATED):
+ if compression == ZIP_STORED:
+ pass
+ elif compression == ZIP_DEFLATED:
+ if not zlib:
+ raise RuntimeError,\
+ "Compression requires the (missing) zlib module"
+ else:
+ raise RuntimeError, "That compression method is not supported"
+ self.filelist = [] # List of ZipInfo instances for archive
+ self.compression = compression # Method of compression
+ self.path = path # source path
+ self.arc_path = arc_path # top level path in archive
+ self.data_ptr = 0 # Keep track of location inside archive
+ def __iter__(self):
+ for data in self.zip_path(self.path, self.arc_path):
+ yield data
+ yield self.archive_footer()
+ def update_data_ptr(self, data):
+ """As data is added to the archive, update a pointer so we can determine
+ the location of various structures as they are generated.
+ data -- data to be added to archive
+ Returns data
+ """
+ self.data_ptr += len(data)
+ return data
+ def zip_path(self, path, archive_dir_name):
+ """Recursively generate data to add directory tree or file pointed to by
+ path to the archive. Results in archive containing
+ archive_dir_name/basename(path)
+ archive_dir_name/basename(path)/*
+ archive_dir_name/basename(path)/*/*
+ .
+ .
+ .
+ path -- path to file or directory
+ archive_dir_name -- name of containing directory in archive
+ """
+ if os.path.isdir(path):
+ dir_name = os.path.basename(path)
+ for name in os.listdir(path):
+ r_path = os.path.join(path, name)
+ r_archive_dir_name = os.path.join(archive_dir_name, dir_name)
+ for data in self.zip_path(r_path, r_archive_dir_name):
+ yield data
+ else:
+ archive_path = os.path.join(archive_dir_name, os.path.basename(path))
+ for data in self.zip_file(path, archive_path):
+ yield data
+ def zip_file(self, filename, arcname=None, compress_type=None):
+ """Generates data to add file at 'filename' to an archive.
+ filename -- path to file to add to arcive
+ arcname -- path of file inside the archive
+ compress_type -- unused in ZipStream, just use self.compression
+ This function generates the data corresponding to the fields:
+ [local file header n]
+ [file data n]
+ [data descriptor n]
+ as described in section V. of the PKZIP Application Note:
+ """
+ st = os.stat(filename)
+ mtime = time.localtime(st.st_mtime)
+ date_time = mtime[0:6]
+ # Create ZipInfo instance to store file information
+ if arcname is None:
+ arcname = filename
+ arcname = os.path.normpath(os.path.splitdrive(arcname)[1])
+ while arcname[0] in (os.sep, os.altsep):
+ arcname = arcname[1:]
+ zinfo = ZipInfo(arcname, date_time)
+ zinfo.external_attr = (st[0] & 0xFFFF) << 16L # Unix attributes
+ if compress_type is None:
+ zinfo.compress_type = self.compression
+ else:
+ zinfo.compress_type = compress_type
+ zinfo.file_size = st.st_size
+ zinfo.header_offset = self.data_ptr # Start of header bytes
+ fp = open(filename, "rb")
+ zinfo.CRC = CRC = 0
+ zinfo.compress_size = compress_size = 0
+ zinfo.file_size = file_size = 0
+ yield self.update_data_ptr(zinfo.FileHeader())
+ if zinfo.compress_type == ZIP_DEFLATED:
+ cmpr = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
+ zlib.DEFLATED, -15)
+ else:
+ cmpr = None
+ while 1:
+ buf = * 8)
+ if not buf:
+ break
+ file_size = file_size + len(buf)
+ CRC = binascii.crc32(buf, CRC)
+ if cmpr:
+ buf = cmpr.compress(buf)
+ compress_size = compress_size + len(buf)
+ yield self.update_data_ptr(buf)
+ fp.close()
+ if cmpr:
+ buf = cmpr.flush()
+ compress_size = compress_size + len(buf)
+ yield self.update_data_ptr(buf)
+ zinfo.compress_size = compress_size
+ else:
+ zinfo.compress_size = file_size
+ zinfo.CRC = CRC
+ zinfo.file_size = file_size
+ yield self.update_data_ptr(zinfo.DataDescriptor())
+ self.filelist.append(zinfo)
+ def archive_footer(self):
+ """Returns data to finish off an archive based on the files already
+ added via zip_file(...). The data returned corresponds to the fields:
+ [archive decryption header]
+ [archive extra data record]
+ [central directory]
+ [zip64 end of central directory record]
+ [zip64 end of central directory locator]
+ [end of central directory record]
+ as described in section V. of the PKZIP Application Note:
+ """
+ data = []
+ count = 0
+ pos1 = self.data_ptr
+ for zinfo in self.filelist: # write central directory
+ count = count + 1
+ dt = zinfo.date_time
+ dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
+ dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
+ extra = []
+ if zinfo.file_size > ZIP64_LIMIT or zinfo.compress_size > ZIP64_LIMIT:
+ extra.append(zinfo.file_size)
+ extra.append(zinfo.compress_size)
+ file_size = 0xffffffff #-1
+ compress_size = 0xffffffff #-1
+ else:
+ file_size = zinfo.file_size
+ compress_size = zinfo.compress_size
+ if zinfo.header_offset > ZIP64_LIMIT:
+ extra.append(zinfo.header_offset)
+ header_offset = -1 # struct "l" format: 32 one bits
+ else:
+ header_offset = zinfo.header_offset
+ extra_data = zinfo.extra
+ if extra:
+ # Append a ZIP64 field to the extra's
+ extra_data = struct.pack('<hh' + 'q'*len(extra),1, 8*len(extra), *extra) + extra_data
+ extract_version = max(45, zinfo.extract_version)
+ create_version = max(45, zinfo.create_version)
+ else:
+ extract_version = zinfo.extract_version
+ create_version = zinfo.create_version
+ centdir = struct.pack(structCentralDir,
+ stringCentralDir, create_version,
+ zinfo.create_system, extract_version, zinfo.reserved,
+ zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
+ zinfo.CRC, compress_size, file_size,
+ len(zinfo.filename), len(extra_data), len(zinfo.comment),
+ 0, zinfo.internal_attr, zinfo.external_attr,
+ header_offset)
+ data.append( self.update_data_ptr(centdir))
+ data.append( self.update_data_ptr(zinfo.filename))
+ data.append( self.update_data_ptr(extra_data))
+ data.append( self.update_data_ptr(zinfo.comment))
+ pos2 = self.data_ptr
+ # Write end-of-zip-archive record
+ if pos1 > ZIP64_LIMIT:
+ # Need to write the ZIP64 end-of-archive records
+ zip64endrec = struct.pack(structEndArchive64, stringEndArchive64,
+ 44, 45, 45, 0, 0, count, count, pos2 - pos1, pos1)
+ data.append( self.update_data_ptr(zip64endrec))
+ zip64locrec = struct.pack(structEndArchive64Locator,
+ stringEndArchive64Locator, 0, pos2, 1)
+ data.append( self.update_data_ptr(zip64locrec))
+ # XXX Why is `pos3` computed next? It's never referenced.
+ pos3 = self.data_ptr
+ endrec = struct.pack(structEndArchive, stringEndArchive,
+ 0, 0, count, count, pos2 - pos1, -1, 0)
+ data.append( self.update_data_ptr(endrec))
+ else:
+ endrec = struct.pack(structEndArchive, stringEndArchive,
+ 0, 0, count, count, pos2 - pos1, pos1, 0)
+ data.append( self.update_data_ptr(endrec))
+ return ''.join(data)
+if __name__ == "__main__":
+ zipfile = sys.argv[1]
+ path = sys.argv[2]
+ zf = open(zipfile, 'wb')
+ for data in ZipStream(path):
+ zf.write(data)
+ zf.close()

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