=> R0 = flags
R1 = pointer to filename, file handle, or source in memory as determined by flag bits 1 & 2
<= if V set then
R0 = pointer to error block
other registers preserved
else
R0,R1 preserved
R2 = load address found in the source data
R3 = length of uncrunched data
File pointer unchanged (if using file handle)
This SWI will get information about crunched data.
Decrunch_Get flags
Bit Meaning if set
0 Assume magic string not present
1 Use a file handle instead of a filename pointer
2 Decrunch data from memory
3 Use hourglass
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