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Add compressed DMG support (based on dmgwiz) #149

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Add compressed DMG support (based on dmgwiz) #149

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49e771f
First implementation based on dmgwiz source code
Lazza Mar 22, 2026
d77fdbe
Refactor AppleDiskImage class to vastly improve performance (partitio…
Lazza Mar 22, 2026
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36 changes: 34 additions & 2 deletions mac_apt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@
from plugins.helpers.aff4_helper import EvidenceImageStream
from plugins.helpers.apfs_reader import ApfsContainer, ApfsDbInfo
from plugins.helpers.apple_sparse_image import AppleSparseImage
from plugins.helpers.apple_disk_image import AppleDiskImage
from plugins.helpers.disk_report import *
from plugins.helpers.writer import *
from plugins.helpers.extract_vr_zip import extract_zip
Expand Down Expand Up @@ -206,6 +207,30 @@ def GetImgInfoObjectForSparse(path):

#### End special handling for .sparseimage ####

##### FOR HANDLING Apple UDIF compressed .dmg ####
class DMG_Info(pytsk3.Img_Info):
def __init__(self, disk_image):
self._disk_image = disk_image
super(DMG_Info, self).__init__(
url="", type=pytsk3.TSK_IMG_TYPE_EXTERNAL)

def close(self):
self._disk_image.close()

def read(self, offset, size):
return self._disk_image.read(offset, size)

def get_size(self):
return self._disk_image.size


def GetImgInfoObjectForDMG(path):
disk_image = AppleDiskImage()
disk_image.open(path)
return DMG_Info(disk_image)

#### End special handling for UDIF .dmg ####

def FindMacOsFiles(mac_info):
if mac_info.IsValidFilePath('/System/Library/CoreServices/SystemVersion.plist'):
if mac_info.IsValidFilePath("/System/Library/Kernels/kernel") or \
Expand Down Expand Up @@ -627,8 +652,15 @@ def ReadPasswordFromFile(path):
elif args.input_type.upper() == 'SPARSE':
img = GetImgInfoObjectForSparse(args.input_path)
mac_info = macinfo.MacInfo(output_params)
elif args.input_type.upper() in ('DD', 'DMG'):
img = pytsk3.Img_Info(args.input_path) # Works for split dd images too! Works for DMG too, if no compression/encryption is used!
elif args.input_type.upper() == 'DMG':
if os.path.isfile(args.input_path) and AppleDiskImage.is_compressed(args.input_path):
img = GetImgInfoObjectForDMG(args.input_path)
else:
# Uncompressed / raw DMG
img = pytsk3.Img_Info(args.input_path)
mac_info = macinfo.MacInfo(output_params)
elif args.input_type.upper() == 'DD':
img = pytsk3.Img_Info(args.input_path) # Works for split dd images too!
mac_info = macinfo.MacInfo(output_params)
elif args.input_type.upper() == 'MOUNTED':
if os.path.isdir(args.input_path):
Expand Down
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