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-1 byte for 6809 LZSA2 depacker

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Emmanuel Marty 2020-06-19 08:57:01 +02:00 committed by GitHub
parent 26bf944d9f
commit e253d3e628
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 3 deletions
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asm/6809/unlzsa2.s
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@ -1,4 +1,4 @@
; unlzsa2.s - 6809 decompression routine for raw LZSA2 - 198 bytes ; unlzsa2.s - 6809 decompression routine for raw LZSA2 - 197 bytes
; compress with lzsa -f2 -r <original_file> <compressed_file> ; compress with lzsa -f2 -r <original_file> <compressed_file>
; ;
; in: x = start of compressed data ; in: x = start of compressed data
@ -84,7 +84,7 @@ lz2val5 orb #$aa ; merge offset bit 0 from A
lz2offs9 lslb ; push token's Z flag bit into carry lz2offs9 lslb ; push token's Z flag bit into carry
rola ; shift Z flag from carry into bit 0 of A rola ; shift Z flag from carry into bit 0 of A
eora #$ff ; set bits 9-15 of offset, reverse bit 8 coma ; set bits 9-15 of offset, reverse bit 8
ldb ,x+ ; load low 8 bits of (negative, signed) offset ldb ,x+ ; load low 8 bits of (negative, signed) offset
bra lz2gotof bra lz2gotof
@ -161,7 +161,7 @@ lz2cpymt lda ,u+ ; copy matched byte
bne lz2cpymt ; loop until all matched bytes are copied bne lz2cpymt ; loop until all matched bytes are copied
puls x ; restore source compressed data pointer puls x ; restore source compressed data pointer
jmp lz2token ; go decode next token lbra lz2token ; go decode next token
lz2nibct rmb 1 ; nibble ready flag lz2nibct rmb 1 ; nibble ready flag