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62 lines
909 B
62 lines
909 B
#include "libmfcrc.h"
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#define crc_msb_byte crc_crc32_msb_byte
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#define crc_msbtable crc_crc32_msbtable
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#define crc_msbtable_asm _crc_crc32_msbtable
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#if defined(SDCC)
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__reentrantb uint32_t crc_msb_byte(uint32_t crc, uint8_t c) __reentrant __naked
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{
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crc;
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c;
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__asm;
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mov r2,a
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mov a,sp
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add a,#-2
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mov r0,a
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mov a,@r0
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xrl a,r2
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rl a
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rl a
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mov r3,a
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anl a,#0xfc
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add a,#crc_msbtable_asm
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xch a,dpl
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mov r2,a
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mov a,r3
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anl a,#0x03
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addc a,#(crc_msbtable_asm >> 8)
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xch a,dph
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mov r3,a
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mov a,#1
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movc a,@a+dptr
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xrl a,r2
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mov r2,a
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mov a,#2
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movc a,@a+dptr
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xrl a,r3
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mov r3,a
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mov a,#3
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movc a,@a+dptr
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xrl a,b
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mov r4,a
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clr a
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movc a,@a+dptr
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mov dpl,a
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mov dph,r2
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mov b,r3
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mov a,r4
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ret
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__endasm;
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}
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#else
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__reentrantb uint32_t crc_msb_byte(uint32_t crc, uint8_t c) __reentrant
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{
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return (crc << 8) ^ crc_msbtable[((uint8_t)(crc >> 24) ^ c) & (uint8_t)0xff];
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}
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#endif
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