88 lines
3.1 KiB
Lua
88 lines
3.1 KiB
Lua
--
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-- vdi.lua: VirtualBox Disk Image
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--
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-- Copyright (c) 2017, Přemysl Eric Janouch <p@janouch.name>
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--
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-- Permission to use, copy, modify, and/or distribute this software for any
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-- purpose with or without fee is hereby granted.
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--
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-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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-- WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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-- MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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-- SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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-- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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-- OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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-- CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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--
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local detect = function (c)
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c.position = 65
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return c:read (4) == "\x7F\x10\xDA\xBE"
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end
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-- As described by https://forums.virtualbox.org/viewtopic.php?t=8046
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local decode = function (c)
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if not detect (c ()) then error ("not a VDI file") end
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c.endianity = "le"
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-- The header is preceded by an arbitrary string
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c.position = 65
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local signature = c:u32 ("image signature")
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local p, vmajor, vminor = c.position, c:u16 (), c:u16 ()
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c (p, c.position - 1):mark ("VDI version: %d.%d", vmajor, vminor)
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local size = c:u32 ("size of header: %d")
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c (64 + 1, 64 + size):mark ("VDI header")
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local type = c:u32 ("image type: %s", function (u32)
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if u32 == 1 then return "dynamic" end
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if u32 == 2 then return "static" end
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return "unknown: %d", u32
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end)
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local flags = c:u32 ("image flags: %#x")
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local p, desc = c.position, c:read (256)
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c (p, c.position - 1):mark ("image description: %s", desc:match ("%C+"))
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local offset_blocks = c:u32 ("offset to blocks: %#x")
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local offset_data = c:u32 ("offset to data: %#x")
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local n_cylinders = c:u32 ("#cylinders: %d")
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local n_heads = c:u32 ("#heads: %d")
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local n_sectors = c:u32 ("#sectors: %d")
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local sector_size = c:u32 ("sector size: %d")
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local unused = c:read (4)
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local disk_size = c:u64 ("disk size: %d bytes")
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local block_size = c:u32 ("block size: %d")
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-- TODO: we should probably count that in -> is it in "blocks" or "data"?
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local block_extra_data = c:u32 ("block extra data: %d")
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local n_blocks = c:u32 ("#blocks in HDD: %d")
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local n_blocks_allocated = c:u32 ("#blocks allocated: %d")
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local function read_uuid4 (c, name)
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local p, uuid = c.position, c:read (16)
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local b = table.pack (uuid:byte (1, #uuid))
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c (p, c.position - 1):mark ("%s: %02x%02x%02x%02x-"
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.. "%02x%02x-%02x%02x-%02x%02x-"
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.. "%02x%02x%02x%02x%02x%02x", name,
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b[1], b[2], b[3], b[4],
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b[5], b[6], b[7], b[8], b[9], b[10],
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b[11], b[12], b[13], b[14], b[15], b[16])
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return uuid
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end
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local uuid_vdi = read_uuid4 (c, "UUID of VDI")
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local uuid_last_snap = read_uuid4 (c, "UUID of last snapshot")
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local uuid_link = read_uuid4 (c, "UUID of link")
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local uuid_parent = read_uuid4 (c, "UUID of parent")
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-- TODO: perhaps this should be more granular and identify all blocks
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c (offset_blocks + 1, offset_blocks + 4 * n_blocks)
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:mark ("VDI blocks")
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c (offset_data + 1, offset_data + block_size * n_blocks_allocated)
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:mark ("VDI data")
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end
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hex.register { type="vdi", detect=detect, decode=decode }
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