=> R0 = flags
R1 = pointer to filename, file handle, or source in memory as determined by flag bits 1 & 2
R2 = pointer to destination address, if forcing destination address (bit 4)
<= if V set then
R0 = pointer to error block
other registers preserved
file pointer unchanged (if using file handle)
else
R0 preserved
R1 = end of data, if reading from memory
preserved, otherwise
R2 = load address found in the source data
R3 = length of uncrunched data
File pointer updated if reading from file
This SWI will decrunch crunched data. As the decompressor works in SVC mode, you can decrunch to a protected area of memory.
Decrunch_Decrunch 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
4 Force destination address
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