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from common import WiiStringTableBuilder, alignUp, alignDown
from filesystem import *
import struct
import os
import cStringIO
class WiiArchiveU8:
class ReadInfo:
# startPos, stringTable, currentNode
pass
class WriteInfo:
# startPos, stringTableBuilder, currentRecursionLevel,
# currentNode, nextDataOffset
pass
def __init__(self, handle=None):
self.root = WiiDirectory()
if handle:
if not hasattr(handle, 'read'):
handle = cStringIO.StringIO(handle)
info = WiiArchiveU8.ReadInfo()
info.startPos = handle.tell()
magic = handle.read(4)
if magic != "U\xAA8\x2D":
print("WiiArchiveU8: tried to load an archive without the U8 magic")
fstStart, fstSize, dataOffset = struct.unpack('>III', handle.read(12))
# read the FST
handle.seek(info.startPos + fstStart)
# read the root node
handle.seek(8, os.SEEK_CUR) # ignore type, nameOffset and dataOffset
rootNodeLastChild = struct.unpack('>I', handle.read(4))[0]
# but before we do this, read the string table
savePos = handle.tell()
handle.seek(savePos + ((rootNodeLastChild - 1) * 12))
stringTableLength = fstSize - (rootNodeLastChild * 12)
info.stringTable = handle.read(stringTableLength)
# now read the root node
handle.seek(savePos)
info.currentNode = 1
self._readDir(handle, self.root, rootNodeLastChild, info)
def _readDir(self, handle, directory, lastChild, info):
# read every node in this directory
while info.currentNode < lastChild:
info.currentNode += 1
value, dataOffset, size = struct.unpack('>III', handle.read(12))
nameOffset = value & 0xFFFFFF
objType = value >> 24
if objType == 0:
newObj = WiiFile()
elif objType == 1:
newObj = WiiDirectory()
else:
raise "oh crap! unknown FS obj type %d" % objType
nameEnd = info.stringTable.find("\0", nameOffset)
newObj.name = info.stringTable[nameOffset:nameEnd]
if newObj.isFile():
savePos = handle.tell()
handle.seek(info.startPos + dataOffset)
newObj.data = handle.read(size)
handle.seek(savePos)
elif newObj.isDirectory():
self._readDir(handle, newObj, size, info)
directory.addChild(newObj)
def pack(self, handle=None):
returnData = False
if handle is None:
handle = cStringIO.StringIO()
returnData = True
info = WiiArchiveU8.WriteInfo()
# first off, before we do anything else, create the string table
info.stringTableBuilder = WiiStringTableBuilder()
self._addNodeToStringTable(self.root, info.stringTableBuilder)
stringTable = info.stringTableBuilder.data
# calculate various fun offsets/sizes
nodeCount = self._countNode(self.root)
info.startPos = handle.tell()
fstStart = 0x20
nodeDataSize = nodeCount * 12
stringTableSize = len(stringTable)
fstSize = nodeDataSize + stringTableSize
dataOffset = alignUp(fstStart + fstSize, 0x20)
# now write the header
handle.write("U\xAA8\x2D")
handle.write(struct.pack('>III', fstStart, fstSize, dataOffset))
handle.write("\0"*16)
# write root node
info.currentNode = 1
info.currentRecursionLevel = 0
info.nextDataOffset = dataOffset
handle.write(struct.pack('>III',
0x01000000 | info.stringTableBuilder.add(''),
0, nodeCount))
self._writeDir(handle, self.root, info)
# write string table
handle.write(stringTable)
# write data (after padding)
handle.write("\0" * (dataOffset - fstSize - fstStart))
self._writeNodeData(handle, self.root)
# looks like we are finally done
if returnData:
data = handle.getvalue()
handle.close()
return data
def _addNodeToStringTable(self, node, table):
table.add(node.name)
if node.isDirectory():
for obj in node.children:
self._addNodeToStringTable(obj, table)
def _countNode(self, node):
if node.isDirectory():
return 1 + sum(map(self._countNode, node.children))
else:
return 1
def _writeDir(self, handle, directory, info):
for obj in directory.children:
info.currentNode += 1
if obj.isDirectory():
handle.write(struct.pack('>III',
0x01000000 | info.stringTableBuilder.add(obj.name),
info.currentRecursionLevel, 0))
lastChildFieldPos = handle.tell() - 4
info.currentRecursionLevel += 1
self._writeDir(handle, obj, info)
info.currentRecursionLevel -= 1
# write lastChild field
dirEndPos = handle.tell()
handle.seek(lastChildFieldPos)
handle.write(struct.pack('>I', info.currentNode))
handle.seek(dirEndPos)
elif obj.isFile():
handle.write(struct.pack('>III',
info.stringTableBuilder.add(obj.name),
info.nextDataOffset, len(obj.data)))
info.nextDataOffset = alignUp(info.nextDataOffset + len(obj.data), 0x20)
def _writeNodeData(self, handle, node):
if node.isDirectory():
for obj in node.children:
self._writeNodeData(handle, obj)
elif node.isFile():
size = len(node.data)
handle.write(node.data)
handle.write("\0" * (alignUp(size, 0x20) - size))
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