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License: GNU General Public License v3.0
CGM Metafile info
License: GNU General Public License v3.0
Something is wrong with ALLELM02.CGM. It includes an ESCAPE
element towards the end (starting at byte 0x420) that seems to use a different format of data record (not conforming to what 8632-3 includes as NOTE 12 of Table 1 and 8632-1 in Annex H.2.2).
However, within the same package, there are other files (ESCAPE01.CGM
and ESCAPE02.CGM
) that include a working SDR.
ALLELM02.CGM
00000420h: 60 2F FF 9B 0C 60 45 73 63 61 70 65 44 61 74 61 ; \`/ÿ›.\`EscapeData
00000430h: 27 ; '
60 2F
is the Command Header (Class 6, Id 1, Length 15)
FF 9B
should be the ESCAPE
identifier (P1)
❗ a SDR length similar to S/SF type should follow?
0C
is the data type index String
❗ the data element count should follow?
60 45 73 63 61 70 65 44 61 74 61
is the encoded string "EscapeData"
ESCAPE01.CGM
0000012eh: 60 2E 00 16 0B 00 05 00 01 00 01 00 02 00 01 00 ; `...............
60 2E
is the Command Header (Class 6, Id 1, Length 14)
00 16
is the ESCAPE
identifier (P1) for item 22 "Transparent Cell Color"
0B
is the S/SF style SDR length
00 05
is the data type index Enumerated
00 01
is the data entry count 1 (one entry)
00 01
is the encoded value 1 (one), conforming to the Escape Transparency Indicator "on"
00 02
is the data type index ColorIndex
00 01
is the data entry count 1 (one entry)
00
is the encoded value 0 (zero), conforming to the Escape Transparent Cell Color Specifier "Color Index 0"
能实现CGM图形浏览吗?
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