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-------------------------------------------

LGE KDZ Utilities
originally
Copyright 2013 "IOMonster" (thecubed on XDA and GitHub)
Copyright 2016 Elliott Mitchell

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These two scripts will allow you to extract both KDZ files and DZ files

Run unkdz.py or undz.py with the -h option to get more options.

	-l or --list
		Lists all files contained in the archive

	-x or --extract
		Extract all portions or as chunk-files.  See -h or below for
		more detail.

	-c or --chunks
		(undz-only) Extract archive as chunks, unless a specific
		chunk number is give, all chunks will be extracted.

	-s ID or --single ID
		Extract a single slice/partition by ID (can be found with
		--list).  With undz multiple IDs can be given and the whole
		slice/partition will be extracted

	-i or --image
		(undz-only) Extract who archive as a disk image

	-d DIR or --dir DIR
		Set directory instead of the default "[kdz|dz]extracted"
		directory in the current path

	-f FILE or --file FILE
		File to operate on

A sample workflow can look like:

$ unkdz -f H90120e_00_0316.kdz -l
[+] KDZ Partition List (format v2)
=========================================
 0 : H90120e_00.dz (1927680393 bytes)
 1 : LGUP_c.dll (2875560 bytes)
 2 : LGUP_c.dylib (1170000 bytes)
$ unkdz -f H90120e_00_0316.kdz -x
[+] Extracting all partitions from v2 file!

[+] Extracting H90120e_00.dz to kdzextracted/H90120e_00.dz
[+] Extracting LGUP_c.dll to kdzextracted/LGUP_c.dll
[+] Extracting LGUP_c.dylib to kdzextracted/LGUP_c.dylib
$ undz -f kdzextracted/H90120e_00.dz -l
[!] Warning: Chunk is part of "BackupGPT", but starts in front of slice?!
[+] DZ Partition List
=========================================
 1/ 1 : PrimaryGPT_0.bin (5198 bytes)
 2/?? : _unallocated_0 (<empty>)
 3/ 2 : modem_16384.bin (42883013 bytes)
 4/?? : spare1 (<empty>)
 5/ 3 : pmic_196608.bin (11067 bytes)
 6/ 4 : sbl1_197632.bin (290344 bytes)
 7/ 5 : tz_199680.bin (258139 bytes)
 8/ 6 : sdi_201728.bin (14691 bytes)
 9/ 7 : hyp_202752.bin (23672 bytes)
10/ 8 : rpm_203776.bin (111303 bytes)
11/ 9 : aboot_204800.bin (407421 bytes)
12/10 : sbl1bak_208896.bin (290344 bytes)
13/11 : pmicbak_210944.bin (11067 bytes)
14/12 : hypbak_211968.bin (23672 bytes)
15/13 : tzbak_212992.bin (258139 bytes)
16/14 : rpmbak_215040.bin (111303 bytes)
17/15 : abootbak_216064.bin (407421 bytes)
18/16 : sdibak_220160.bin (14691 bytes)
19/?? : limits (<empty>)
20/?? : apdp (<empty>)
21/?? : msadp (<empty>)
22/?? : dpo (<empty>)
23/?? : spare2 (<empty>)
24/?? : persistent (<empty>)
25/?? : devinfo (<empty>)
26/?? : spare3 (<empty>)
27/?? : misc (<empty>)
28/17 : persist_278528.bin (23385 bytes)
29/?? : modemst1 (<empty>)
30/?? : modemst2 (<empty>)
31/?? : fsg (<empty>)
32/?? : fsc (<empty>)
33/?? : ssd (<empty>)
34/?? : keystore (<empty>)
35/?? : DDR (<empty>)
36/18 : sec_360448.bin (2603 bytes)
37/?? : encrypt (<empty>)
38/?? : eksst (<empty>)
39/19 : rct_363520.bin (2317 bytes)
40/?? : spare4 (<empty>)
41/20 : laf_376832.bin (19557377 bytes)
42/21 : boot_475136.bin (16717367 bytes)
43/22 : recovery_557056.bin (17915348 bytes)
44/?? : drm (<empty>)
45/?? : sns (<empty>)
46/?? : mpt (<empty>)
47/23 : raw_resources_737280.bin (888299 bytes)
48/24 : raw_resourcesbak_745472.bin (888299 bytes)
49/25 : factory_753664.bin (2317 bytes)
50/?? : spare5 (<empty>)
51/?? : fota (<empty>)
52/?? : fau (<empty>)
53/26 : system_901120.bin (26667953 bytes)
53/27 : system_1165448.bin (58109153 bytes)
53/28 : system_1429456.bin (54709752 bytes)
53/29 : system_1689736.bin (2313 bytes)
53/30 : system_1693784.bin (52095781 bytes)
53/31 : system_1953744.bin (70617703 bytes)
53/32 : system_2214024.bin (2313 bytes)
53/33 : system_2218072.bin (78577875 bytes)
53/34 : system_2478032.bin (48937084 bytes)
53/35 : system_2738312.bin (2313 bytes)
53/36 : system_2742360.bin (70024761 bytes)
53/37 : system_3002320.bin (66564653 bytes)
53/38 : system_3262600.bin (2313 bytes)
53/39 : system_3266648.bin (60402536 bytes)
53/40 : system_3526608.bin (62078376 bytes)
53/41 : system_3788752.bin (73287391 bytes)
53/42 : system_4050896.bin (69724602 bytes)
53/43 : system_4313040.bin (56306774 bytes)
53/44 : system_4575184.bin (55839047 bytes)
53/45 : system_4837328.bin (61357275 bytes)
53/46 : system_5099472.bin (59119265 bytes)
53/47 : system_5361616.bin (91752309 bytes)
53/48 : system_5623760.bin (62343057 bytes)
53/49 : system_5885904.bin (76765526 bytes)
53/50 : system_6148048.bin (72957287 bytes)
53/51 : system_6410192.bin (59918862 bytes)
53/52 : system_6672336.bin (61370224 bytes)
53/53 : system_6934480.bin (59869427 bytes)
53/54 : system_7196624.bin (58921312 bytes)
53/55 : system_7456904.bin (2313 bytes)
53/56 : system_7460952.bin (66004602 bytes)
53/57 : system_7720912.bin (61648352 bytes)
53/58 : system_7981192.bin (2313 bytes)
53/59 : system_7985240.bin (65414717 bytes)
53/60 : system_8245200.bin (30703423 bytes)
53/61 : system_8503296.bin (2314 bytes)
53/62 : system_8765440.bin (2314 bytes)
53/63 : system_9027584.bin (2314 bytes)
53/64 : system_9289728.bin (2314 bytes)
53/65 : system_9551872.bin (2317 bytes)
53/66 : system_9554936.bin (34407069 bytes)
54/?? : cache (<empty>)
55/?? : userdata (<empty>)
56/?? : grow (<empty>)
57/67 : BackupGPT_122141696.bin (5181 bytes)
$ undz -f kdzextracted/H90120e_00.dz -x
[!] Warning: Chunk is part of "BackupGPT", but starts in front of slice?!
[+] Extracting all chunkfiles!

[+] Extracting PrimaryGPT_0.bin to PrimaryGPT_0.bin.chunk
[+] Extracting modem_16384.bin to modem_16384.bin.chunk
[+] Extracting pmic_196608.bin to pmic_196608.bin.chunk
[+] Extracting sbl1_197632.bin to sbl1_197632.bin.chunk
[+] Extracting tz_199680.bin to tz_199680.bin.chunk
[+] Extracting sdi_201728.bin to sdi_201728.bin.chunk
[+] Extracting hyp_202752.bin to hyp_202752.bin.chunk
[+] Extracting rpm_203776.bin to rpm_203776.bin.chunk
[+] Extracting aboot_204800.bin to aboot_204800.bin.chunk
[+] Extracting sbl1bak_208896.bin to sbl1bak_208896.bin.chunk
[+] Extracting pmicbak_210944.bin to pmicbak_210944.bin.chunk
[+] Extracting hypbak_211968.bin to hypbak_211968.bin.chunk
[+] Extracting tzbak_212992.bin to tzbak_212992.bin.chunk
[+] Extracting rpmbak_215040.bin to rpmbak_215040.bin.chunk
[+] Extracting abootbak_216064.bin to abootbak_216064.bin.chunk
[+] Extracting sdibak_220160.bin to sdibak_220160.bin.chunk
[+] Extracting persist_278528.bin to persist_278528.bin.chunk
[+] Extracting sec_360448.bin to sec_360448.bin.chunk
[+] Extracting rct_363520.bin to rct_363520.bin.chunk
[+] Extracting laf_376832.bin to laf_376832.bin.chunk
[+] Extracting boot_475136.bin to boot_475136.bin.chunk
[+] Extracting recovery_557056.bin to recovery_557056.bin.chunk
[+] Extracting raw_resources_737280.bin to raw_resources_737280.bin.chunk
[+] Extracting raw_resourcesbak_745472.bin to raw_resourcesbak_745472.bin.chunk
[+] Extracting factory_753664.bin to factory_753664.bin.chunk
[+] Extracting system_901120.bin to system_901120.bin.chunk
[+] Extracting system_1165448.bin to system_1165448.bin.chunk
[+] Extracting system_1429456.bin to system_1429456.bin.chunk
[+] Extracting system_1689736.bin to system_1689736.bin.chunk
[+] Extracting system_1693784.bin to system_1693784.bin.chunk
[+] Extracting system_1953744.bin to system_1953744.bin.chunk
[+] Extracting system_2214024.bin to system_2214024.bin.chunk
[+] Extracting system_2218072.bin to system_2218072.bin.chunk
[+] Extracting system_2478032.bin to system_2478032.bin.chunk
[+] Extracting system_2738312.bin to system_2738312.bin.chunk
[+] Extracting system_2742360.bin to system_2742360.bin.chunk
[+] Extracting system_3002320.bin to system_3002320.bin.chunk
[+] Extracting system_3262600.bin to system_3262600.bin.chunk
[+] Extracting system_3266648.bin to system_3266648.bin.chunk
[+] Extracting system_3526608.bin to system_3526608.bin.chunk
[+] Extracting system_3788752.bin to system_3788752.bin.chunk
[+] Extracting system_4050896.bin to system_4050896.bin.chunk
[+] Extracting system_4313040.bin to system_4313040.bin.chunk
[+] Extracting system_4575184.bin to system_4575184.bin.chunk
[+] Extracting system_4837328.bin to system_4837328.bin.chunk
[+] Extracting system_5099472.bin to system_5099472.bin.chunk
[+] Extracting system_5361616.bin to system_5361616.bin.chunk
[+] Extracting system_5623760.bin to system_5623760.bin.chunk
[+] Extracting system_5885904.bin to system_5885904.bin.chunk
[+] Extracting system_6148048.bin to system_6148048.bin.chunk
[+] Extracting system_6410192.bin to system_6410192.bin.chunk
[+] Extracting system_6672336.bin to system_6672336.bin.chunk
[+] Extracting system_6934480.bin to system_6934480.bin.chunk
[+] Extracting system_7196624.bin to system_7196624.bin.chunk
[+] Extracting system_7456904.bin to system_7456904.bin.chunk
[+] Extracting system_7460952.bin to system_7460952.bin.chunk
[+] Extracting system_7720912.bin to system_7720912.bin.chunk
[+] Extracting system_7981192.bin to system_7981192.bin.chunk
[+] Extracting system_7985240.bin to system_7985240.bin.chunk
[+] Extracting system_8245200.bin to system_8245200.bin.chunk
[+] Extracting system_8503296.bin to system_8503296.bin.chunk
[+] Extracting system_8765440.bin to system_8765440.bin.chunk
[+] Extracting system_9027584.bin to system_9027584.bin.chunk
[+] Extracting system_9289728.bin to system_9289728.bin.chunk
[+] Extracting system_9551872.bin to system_9551872.bin.chunk
[+] Extracting system_9554936.bin to system_9554936.bin.chunk
[+] Extracting BackupGPT_122141696.bin to BackupGPT_122141696.bin.chunk
$ rm dzextracted/system_[0-9]*[0-9].bin.chunk
$ undz -f kdzextracted/H90120e_00.dz -s 53
[!] Warning: Chunk is part of "BackupGPT", but starts in front of slice?!
[+] Extracting single slice^Wpartition!

[+] Extracting system_901120.bin to system.image
[+] Extracting system_1165448.bin to system.image
[+] Extracting system_1429456.bin to system.image
[+] Extracting system_1689736.bin to system.image
[+] Extracting system_1693784.bin to system.image
[+] Extracting system_1953744.bin to system.image
[+] Extracting system_2214024.bin to system.image
[+] Extracting system_2218072.bin to system.image
[+] Extracting system_2478032.bin to system.image
[+] Extracting system_2738312.bin to system.image
[+] Extracting system_2742360.bin to system.image
[+] Extracting system_3002320.bin to system.image
[+] Extracting system_3262600.bin to system.image
[+] Extracting system_3266648.bin to system.image
[+] Extracting system_3526608.bin to system.image
[+] Extracting system_3788752.bin to system.image
[+] Extracting system_4050896.bin to system.image
[+] Extracting system_4313040.bin to system.image
[+] Extracting system_4575184.bin to system.image
[+] Extracting system_4837328.bin to system.image
[+] Extracting system_5099472.bin to system.image
[+] Extracting system_5361616.bin to system.image
[+] Extracting system_5623760.bin to system.image
[+] Extracting system_5885904.bin to system.image
[+] Extracting system_6148048.bin to system.image
[+] Extracting system_6410192.bin to system.image
[+] Extracting system_6672336.bin to system.image
[+] Extracting system_6934480.bin to system.image
[+] Extracting system_7196624.bin to system.image
[+] Extracting system_7456904.bin to system.image
[+] Extracting system_7460952.bin to system.image
[+] Extracting system_7720912.bin to system.image
[+] Extracting system_7981192.bin to system.image
[+] Extracting system_7985240.bin to system.image
[+] Extracting system_8245200.bin to system.image
[+] Extracting system_8503296.bin to system.image
[+] Extracting system_8765440.bin to system.image
[+] Extracting system_9027584.bin to system.image
[+] Extracting system_9289728.bin to system.image
[+] Extracting system_9551872.bin to system.image
[+] Extracting system_9554936.bin to system.image
$ 

At this point you can modify out/system.image to your liking.  For this
particular device (LG H901), system.image is an EXT4 filesystem.  Many tools
exist for modifying EXT4 filesystems and these should work fine.

The next step would be reconstructing the file.  There are three steps, turning
the files into chunks, merging them together into a DZ file, and then merging
everything back into a KDZ file.  The first step has some quirks.

"image2chunks.py" currently has 3 strategies for breaking image files into
chunks.  At of this writing the prefered strategy is to make use of ext2simg
from the Android image utilities.  This produces results that differ somewhat
from LG's images, but is believed to produce sane results.  The differences
have me wondering whether LG's images are either unsafe, or else relying on
special knowledge of the hardware (is the eMMC certain to give back zero blocks
for TRIMmed areas?).

The next two strategies are utilizing support for SEEK_DATA and SEEK_HOLE, or
probing for the presence of holes.  Operating System support for
SEEK_DATA/SEEK_HOLE is decent, though to my knowledge no versions of Windows
include this.  This seems a bit of a cheat since it is relying on knowledge of
which areas of the image haven't been written to.  Probing marks an awful lot
of areas as holes, which leaves me uncomfortable believing the results to be
sane.  As such I reccommend the first if available (ext2simg is known to work
for Linux, but I'm unsure Windows binaries are available).

$ image2chunks --ext4 dzextracted/system.image
[+] Compressing system.image to system_901120.bin (0 empty blocks)
[+] Compressing system.image to system_1163264.bin (8 empty blocks)
[+] Compressing system.image to system_1425408.bin (8 empty blocks)
[+] Compressing system.image to system_1687552.bin (8 empty blocks)
[+] Compressing system.image to system_1949696.bin (8 empty blocks)
[+] Compressing system.image to system_2211840.bin (8 empty blocks)
[+] Compressing system.image to system_2473984.bin (8 empty blocks)
[+] Compressing system.image to system_2736128.bin (8 empty blocks)
[+] Compressing system.image to system_2998272.bin (8 empty blocks)
[+] Compressing system.image to system_3260416.bin (8 empty blocks)
[+] Compressing system.image to system_3522560.bin (8 empty blocks)
[+] Compressing system.image to system_3784704.bin (8 empty blocks)
[+] Compressing system.image to system_4046848.bin (8 empty blocks)
[+] Compressing system.image to system_4308992.bin (8 empty blocks)
[+] Compressing system.image to system_4571136.bin (8 empty blocks)
[+] Compressing system.image to system_4833280.bin (8 empty blocks)
[+] Compressing system.image to system_5095424.bin (8 empty blocks)
[+] Compressing system.image to system_5357568.bin (8 empty blocks)
[+] Compressing system.image to system_5619712.bin (8 empty blocks)
[+] Compressing system.image to system_5881856.bin (8 empty blocks)
[+] Compressing system.image to system_6144000.bin (8 empty blocks)
[+] Compressing system.image to system_6406144.bin (8 empty blocks)
[+] Compressing system.image to system_6668288.bin (8 empty blocks)
[+] Compressing system.image to system_6930432.bin (8 empty blocks)
[+] Compressing system.image to system_7192576.bin (8 empty blocks)
[+] Compressing system.image to system_7454720.bin (8 empty blocks)
[+] Compressing system.image to system_7716864.bin (8 empty blocks)
[+] Compressing system.image to system_7979008.bin (8 empty blocks)
[+] Compressing system.image to system_8241152.bin (132312 empty blocks)
[+] Compressing system.image to system_8503296.bin (258096 empty blocks)
[+] Compressing system.image to system_8765440.bin (258096 empty blocks)
[+] Compressing system.image to system_9027584.bin (258096 empty blocks)
[+] Compressing system.image to system_9289728.bin (258096 empty blocks)
[+] Compressing system.image to system_9551872.bin (8 empty blocks)
[+] done

$ mkdz -f kdzextracted/H90120e_00.dz -m
[+] Writing 60 chunks to H90120e_00.dz:

[+] Writing PrimaryGPT_0.bin.chunk to H90120e_00.dz (5710 bytes)
[+] Writing modem_16384.bin.chunk to H90120e_00.dz (42883525 bytes)
[+] Writing pmic_196608.bin.chunk to H90120e_00.dz (11579 bytes)
[+] Writing sbl1_197632.bin.chunk to H90120e_00.dz (290856 bytes)
[+] Writing tz_199680.bin.chunk to H90120e_00.dz (258651 bytes)
[+] Writing sdi_201728.bin.chunk to H90120e_00.dz (15203 bytes)
[+] Writing hyp_202752.bin.chunk to H90120e_00.dz (24184 bytes)
[+] Writing rpm_203776.bin.chunk to H90120e_00.dz (111815 bytes)
[+] Writing aboot_204800.bin.chunk to H90120e_00.dz (407933 bytes)
[+] Writing sbl1bak_208896.bin.chunk to H90120e_00.dz (290856 bytes)
[+] Writing pmicbak_210944.bin.chunk to H90120e_00.dz (11579 bytes)
[+] Writing hypbak_211968.bin.chunk to H90120e_00.dz (24184 bytes)
[+] Writing tzbak_212992.bin.chunk to H90120e_00.dz (258651 bytes)
[+] Writing rpmbak_215040.bin.chunk to H90120e_00.dz (111815 bytes)
[+] Writing abootbak_216064.bin.chunk to H90120e_00.dz (407933 bytes)
[+] Writing sdibak_220160.bin.chunk to H90120e_00.dz (15203 bytes)
[+] Writing persist_278528.bin.chunk to H90120e_00.dz (23897 bytes)
[+] Writing sec_360448.bin.chunk to H90120e_00.dz (3115 bytes)
[+] Writing rct_363520.bin.chunk to H90120e_00.dz (2829 bytes)
[+] Writing laf_376832.bin.chunk to H90120e_00.dz (19557889 bytes)
[+] Writing boot_475136.bin.chunk to H90120e_00.dz (16717879 bytes)
[+] Writing recovery_557056.bin.chunk to H90120e_00.dz (17915860 bytes)
[+] Writing raw_resources_737280.bin.chunk to H90120e_00.dz (888811 bytes)
[+] Writing raw_resourcesbak_745472.bin.chunk to H90120e_00.dz (888811 bytes)
[+] Writing factory_753664.bin.chunk to H90120e_00.dz (2829 bytes)
[+] Writing system_901120.bin.chunk to H90120e_00.dz (26665075 bytes)
[+] Writing system_1163264.bin.chunk to H90120e_00.dz (58115452 bytes)
[+] Writing system_1425408.bin.chunk to H90120e_00.dz (54704375 bytes)
[+] Writing system_1687552.bin.chunk to H90120e_00.dz (52101156 bytes)
[+] Writing system_1949696.bin.chunk to H90120e_00.dz (70629440 bytes)
[+] Writing system_2211840.bin.chunk to H90120e_00.dz (78588381 bytes)
[+] Writing system_2473984.bin.chunk to H90120e_00.dz (48942302 bytes)
[+] Writing system_2736128.bin.chunk to H90120e_00.dz (70046985 bytes)
[+] Writing system_2998272.bin.chunk to H90120e_00.dz (66573462 bytes)
[+] Writing system_3260416.bin.chunk to H90120e_00.dz (60415920 bytes)
[+] Writing system_3522560.bin.chunk to H90120e_00.dz (62080251 bytes)
[+] Writing system_3784704.bin.chunk to H90120e_00.dz (73292434 bytes)
[+] Writing system_4046848.bin.chunk to H90120e_00.dz (69740045 bytes)
[+] Writing system_4308992.bin.chunk to H90120e_00.dz (56316206 bytes)
[+] Writing system_4571136.bin.chunk to H90120e_00.dz (55851208 bytes)
[+] Writing system_4833280.bin.chunk to H90120e_00.dz (61368784 bytes)
[+] Writing system_5095424.bin.chunk to H90120e_00.dz (59140184 bytes)
[+] Writing system_5357568.bin.chunk to H90120e_00.dz (91760790 bytes)
[+] Writing system_5619712.bin.chunk to H90120e_00.dz (62347819 bytes)
[+] Writing system_5881856.bin.chunk to H90120e_00.dz (76785134 bytes)
[+] Writing system_6144000.bin.chunk to H90120e_00.dz (72970032 bytes)
[+] Writing system_6406144.bin.chunk to H90120e_00.dz (59925585 bytes)
[+] Writing system_6668288.bin.chunk to H90120e_00.dz (61374764 bytes)
[+] Writing system_6930432.bin.chunk to H90120e_00.dz (59874700 bytes)
[+] Writing system_7192576.bin.chunk to H90120e_00.dz (58924350 bytes)
[+] Writing system_7454720.bin.chunk to H90120e_00.dz (66024525 bytes)
[+] Writing system_7716864.bin.chunk to H90120e_00.dz (61645767 bytes)
[+] Writing system_7979008.bin.chunk to H90120e_00.dz (65437165 bytes)
[+] Writing system_8241152.bin.chunk to H90120e_00.dz (30711429 bytes)
[+] Writing system_8503296.bin.chunk to H90120e_00.dz (9577 bytes)
[+] Writing system_8765440.bin.chunk to H90120e_00.dz (9577 bytes)
[+] Writing system_9027584.bin.chunk to H90120e_00.dz (9577 bytes)
[+] Writing system_9289728.bin.chunk to H90120e_00.dz (9577 bytes)
[+] Writing system_9551872.bin.chunk to H90120e_00.dz (34419508 bytes)
[+] Writing BackupGPT_122141696.bin.chunk to H90120e_00.dz (5693 bytes)
$ mkkdz -f myH901_20e.kdz -m
[+] Writing LGUP_c.dll to output file myH901_20e.kdz
[+] Writing LGUP_c.dylib to output file myH901_20e.kdz
[+] Writing H90120e_00.dz to output file myH901_20e.kdz

[+] Writing headers to test.kdz
[+] Done!
$ 

At this point myH901_20e.kdz should be installable using LG's tools.  If the
image was unmodified, and image2chunks.py was used with its --sparse option,
it should be identical to the original file.  This second statement relies on
behavior of the OS and may not work precisely on all systems.  Exactly
identical files have only been shown on Linux with system.image being unpacked
onto a EXT4 FS (dzextracted being on EXT4).  EXT2/3 may also work if mounted
using the EXT4's backwards compatibility mode, rather than the native
implementation of EXT2/3.  Most other flavors of Unix should get sane output,
but not as likely to be identical.

There is a value in the chunk headers referred to as "trimCount" in the code,
as well as in the .params files (these are simply text files) generated for
extracted slices.  My suspicion is this is this is a count of blocks to be
TRIMed prior to writing the data from the DZ file.  There are some oddities
though, notably several slices/partitions are marked as being wiped by a
large value on the prior chunk.  I'm unsure what this means, perhaps LG's tools
ignore super large wipes.

There is also the quirk of the backup GPT's chunk extending near the front of
the "grow" slice/partition.  My suspicion is this is a weakness of the tools LG
is using to generate the files.  Perhaps they don't understand the concept of
chunks which don't start at a slice/partition boundary, they also may not
correctly handle the case of chunks which *begin* with a hole.

Lastly, I'm concerned about the number of unknowns in the DZ header.  Several
look to be harmless to simply copy the value from an existing file, but others
are totally unknown to me at this time.  Two fields look to be date codes of
some flavor (easy, simply copy).  I worry more of these need to be regenerated,
but I've got no idea what to put in new files.


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Permission was granted to rerelease this software as long as attribution was
given.  This version is distributed under the terms of the GNU Public License
version 3.

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