#------------------------------------------------------------------------------
-# $File: map,v 1.3 2015/07/09 15:16:41 christos Exp $
+# $File: map,v 1.5 2018/12/28 00:22:34 christos Exp $
# map: file(1) magic for Map data
#
>>53 byte 8 \b (Elevations)
>>53 byte 10 \b (Totals)
+# Summary: Garmin map
+# From: Joerg Jenderek
+# URL: https://en.wikipedia.org/wiki/Garmin_.img
+# Reference: https://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin/IMG_File_Format
+# sourceforge.net/projects/garmin-img/files/IMG%20File%20Format/1.0/imgformat-1.0.pdf
+# GRR: similar to MBR boot sector handled by ./filesystems
+0x1FE leshort =0xAA55
+# look for valid map signature
+>0x13 string =IMG\0
+>>0 use garmin-map
+0 name garmin-map
+>0 ubyte x Garmin
+!:mime application/x-garmin-map
+# If non-zero, every byte of the entire .img file is to be XORed with this value
+>0 ubyte !0 \b, 0x%x XORed
+# goto block before FAT
+>(0x40.b*512) ubyte x
+# 1st fat name "DLLINFO TXT" only found for vpm
+>>&512 string =DLLINFO\ TXT map (Voice Processing)
+# there exist 2 other Garmin VPM formats; see ./audio
+!:ext vpm
+# Deutsch__Yannick_D4481-00_0210.vpm
+#>>>512 search/0x0116da60/s RIFF \b; with
+# determine type voice type by ./riff
+#>>>>&0 indirect x \b
+>>&512 string !DLLINFO\ TXT map
+!:ext img
+# 9 zeros
+>1 ubelong !0 \b, zeroes 0x%x
+# Map's version major
+>8 ubyte x v%u
+# Map's version minor
+>9 ubyte x \b.%.2u
+# Map description[20], 0x20 padded
+>0x49 string x %.20s
+# Map name, continued (0x20 padded, \0 terminated)
+>0x65 string >\ \b%.31s
+# Update year (+1900 for val >= 0x63, +2000 for val <= 0x62)
+>0xB ubyte x \b, updated
+>>0xB ubyte >0x62
+>>>0xB ubyte-100 x 20%.2u
+>>0xB ubyte <0x63
+>>>0xB ubyte x 20%.2u
+# Update month (0-11)
+>0xA ubyte x \b-%.2u
+# All zeroes
+>0xc uleshort !0 \b, zeroes 0x%x
+# Mapsource flag, 1 - file created by Mapsource, 0 - Garmin map visible in Basecamp and Homeport
+#>0xE ubyte !0 \b, Mapsource flag 0x%x
+>0xE ubyte 1 \b, Mapsource
+# Checksum, sum of all bytes modulo 256 should be 0
+#>0xF ubyte x \b, Checksum 0x%x
+# Signature: DSKIMG 0x00 or DSDIMG 0x00 for demo map
+>0x10 string !DSKIMG \b, signature "%.7s"
+# Creation year
+>0x39 uleshort x \b, created %u
+# Creation month (0-11)
+>0x3b ubyte x \b-%.2u
+# Creation day (1-31)
+>0x3c ubyte x \b-%.2u
+# Creation hour (0-23)
+>0x3d ubyte x %u
+# Creation minute (0-59)
+>0x3e ubyte x \b:%.2u
+# Creation second (0-59)
+>0x3f ubyte x \b:%.2u
+# Map file identifier like GARMIN\0
+>0x41 string !GARMIN \b, id "%.7s"
+# Block size exponent, E1; appears to always be 0x09; minimum block size 512 bytes
+>0x61 ubyte !0x09 \b, E1=%u
+# Block size exponent, E2 ; file blocksize=2**(E1+E2)
+>>0x62 ubyte x \b, E2=%u
+>0x61 ubyte =0x09 \b, blocksize
+>>0x62 ubyte 0 512
+>>0x62 ubyte 1 1024
+>>0x62 ubyte 2 2048
+>>0x62 ubyte 3 4096
+>>0x62 ubyte 4 8192
+>>0x62 ubyte 5 16384
+>>0x62 default x
+>>>0x62 ubyte x E2=%u
+# MBR signature
+>0x1FE leshort !0xAA55 \b, invalid MBR
+# 512 zeros
+>0x200 uquad !0 \b, zeroes 0x%llx
+# First sub-file offset (absolute); sometimes NO/UNKNOWN sub file!
+>0x40C ulelong >0 \b, at 0x%x
+# sub-file Header length
+#>>(0x40C.l) uleshort x \b, header len 0x%x
+>>(0x40C.l) uleshort x %u bytes
+# sub-file Type[10] like "GARMIN RGN" "GARMIN TRE", "GARMIN TYP", etc.
+>>(0x40C.l+2) ubyte >0x1F
+>>>(0x40C.l+2) ubyte <0xFF
+>>>>(0x40C.l+2) string x "%.10s"
+# 0x00 for most maps, 0x80 for locked maps (City Nav, City Select, etc.)
+>>>>(0x40C.l+13) ubyte >0 \b, locked 0x%x
+# Block sequence numbers like 0000 0100 0200 ... FFFF
+# >0x420 ubequad >0 \b, seq. 0x%16.16llx
+# >>0x428 ubequad >0 \b%16.16llx
+# >>>0x430 ubequad >0 \b%16.16llx
+# >>>>0x438 ubequad >0 \b%16.16llx
+# >>>>>0x440 ubequad >0 \b%16.16llx
+# >>>>>>0x448 ubequad >0 \b%16.16llx
+# >>>>>>>0x450 ubequad >0 \b%16.16llx
+# >>>>>>>>0x458 ubequad >0 \b%16.16llx
+# >>>>>>>>>0x460 ubequad >0 \b%16.16llx
+# >>>>>>>>>>0x468 ubequad >0 \b%16.16llx
+# >>>>>>>>>>>0x470 ubequad >0 \b%16.16llx
+# >>>>>>>>>>>>0x478 ubequad >0 \b%16.16llx
+# >>>>>>>>>>>>>0x480 ubequad >0 \b%16.16llx
+# >>>>>>>>>>>>>>0x488 ubequad >0 \b%16.16llx
+# >>>>>>>>>>>>>>>0x490 ubequad >0 \b%16.16llx
+# >>>>>>>>>>>>>>>>0x498 ubequad >0 \b%16.16llx
+# >>>>>>>>>>>>>>>>>0x4A0 ubequad >0 \b%16.16llx
+# >>>>>>>>>>>>>>>>>>0x4A8 ubequad >0 \b%16.16llx
+# look for end of FAT
+#>>0x420 search/512/s \xff\xff FAT END
+# Physical block number of FAT header
+#>0x40 ubyte x \b, FAT at phy. block %u
+>0x40 ubyte x
+>>(0x40.b*512) ubyte x
+# 1st FAT block
+>>>&511 use garmin-fat
+# 2nd FAT block
+>>>&1023 use garmin-fat
+# 3th FAT block
+>>>&1535 use garmin-fat
+# 4th FAT block
+>>>&2047 use garmin-fat
+# ... xth FAT block
+#
+# 314 zeros but not in vpm and also gmaptz.img
+>0x84 uquad !0 \b, at 0x84 0x%llx
+# display FileAllocationTable block entry in garmin map
+0 name garmin-fat
+>0 ubyte x \b;
+# sub file part; 0x0003 seems to be garbage
+>0x10 uleshort !0 next 0x%4.4x
+>0x10 uleshort =0
+# fat flag 0~dummy block 1~true sub file
+>>0 ubyte !1 flag %u
+>>0 ubyte =1
+# sub-file name like MAKEGMAP 12345678
+>>>0x1 string x %.8s
+# sub-file typ like RGN TRE MDR LBL
+>>>0x9 string x \b.%.3s
+# size of sub file
+>>>0xC ulelong x \b, %u bytes
+# 32-bit block sequence numbers
+#>>>0x20 ubequad x \b, seq. 0x%16.16llx
+
# TOM TOM GPS watches ttbin files:
# http://github.com/ryanbinns/ttwatch/tree/master/ttbin
# From: Daniel Lenski
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