Blame SOURCES/file-5.11-qcow3.patch
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diff --git a/magic/Magdir/msdos b/magic/Magdir/msdos
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index 8f3e532..21f055d 100644
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--- a/magic/Magdir/msdos
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+++ b/magic/Magdir/msdos
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@@ -811,6 +811,21 @@
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>>24 bequad x \b, %lld bytes
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>>32 belong 1 \b, AES-encrypted
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+>4 belong 3 (v3)
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+# Using the existence of the Backing File Offset to determine whether
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+# to read Backing File Information
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+>>8 bequad >0 \b, has backing file
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+# Note that this isn't a null-terminated string; the length is actually
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+# (16.L). Assuming a null-terminated string happens to work usually, but it
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+# may spew junk until it reaches a \0 in some cases. Also, since there's no
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+# .Q modifier, we just use the bottom four bytes as an offset. Note that if
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+# the file is over 4G, and the backing file path is stored after the first 4G,
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+# the wrong filename will be printed. (This should be (8.Q), when that syntax
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+# is introduced.)
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+>>>(12.L) string >\0 (path %s)
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+>>24 bequad x \b, %lld bytes
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+>>32 belong 1 \b, AES-encrypted
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+
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>4 default x (unknown version)
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0 string/b QEVM QEMU suspend to disk image
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