def __init__(self, archivePathname):
"""Create a ZipArchive, treating the archive at archivePathname as a zip file.
@param archivePathname: a str, naming a path in the filesystem.
"""
self.zipfile = ChunkingZipFile(archivePathname)
self.path = archivePathname
self.pathInArchive = ''
# zipfile is already wasting O(N) memory on cached ZipInfo instances,
# so there's no sense in trying to do this lazily or intelligently
self.childmap = {} # map parent: list of children
for name in self.zipfile.namelist():
name = name.split(ZIP_PATH_SEP)
for x in range(len(name)):
child = name[-x]
parent = ZIP_PATH_SEP.join(name[:-x])
if parent not in self.childmap:
self.childmap[parent] = {}
self.childmap[parent][child] = 1
parent = ''
