Decompile crcCalculateU32Pair
This commit is contained in:
Ryan Dwyer
parent
1d185c52e3
commit
53bb78d630
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@ -8,92 +8,27 @@
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u32 var8007e3c0 = 0xab8d9f77;
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u32 var8007e3c4 = 0x81280783;
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GLOBAL_ASM(
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glabel func0f128f30
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/* f128f30: 27bdffa8 */ addiu $sp,$sp,-88
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/* f128f34: 3c0e8f80 */ lui $t6,0x8f80
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/* f128f38: 3c0f3108 */ lui $t7,0x3108
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/* f128f3c: afb50028 */ sw $s5,0x28($sp)
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/* f128f40: afb40024 */ sw $s4,0x24($sp)
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/* f128f44: afb30020 */ sw $s3,0x20($sp)
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/* f128f48: afb10018 */ sw $s1,0x18($sp)
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/* f128f4c: afb00014 */ sw $s0,0x14($sp)
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/* f128f50: 35efb3c1 */ ori $t7,$t7,0xb3c1
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/* f128f54: 35ce9f47 */ ori $t6,$t6,0x9f47
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/* f128f58: 0085082b */ sltu $at,$a0,$a1
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/* f128f5c: 00a0a825 */ or $s5,$a1,$zero
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/* f128f60: afbf002c */ sw $ra,0x2c($sp)
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/* f128f64: afb2001c */ sw $s2,0x1c($sp)
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/* f128f68: afa60060 */ sw $a2,0x60($sp)
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/* f128f6c: 00803825 */ or $a3,$a0,$zero
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/* f128f70: 00008825 */ or $s1,$zero,$zero
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/* f128f74: afae0048 */ sw $t6,0x48($sp)
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/* f128f78: afaf004c */ sw $t7,0x4c($sp)
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/* f128f7c: 00009825 */ or $s3,$zero,$zero
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/* f128f80: 0000a025 */ or $s4,$zero,$zero
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/* f128f84: 10200016 */ beqz $at,.L0f128fe0
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/* f128f88: 00808025 */ or $s0,$a0,$zero
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/* f128f8c: afa40058 */ sw $a0,0x58($sp)
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/* f128f90: 27b20048 */ addiu $s2,$sp,0x48
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.L0f128f94:
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/* f128f94: 92180000 */ lbu $t8,0x0($s0)
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/* f128f98: 8fad004c */ lw $t5,0x4c($sp)
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/* f128f9c: 3239000f */ andi $t9,$s1,0xf
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/* f128fa0: 03384004 */ sllv $t0,$t8,$t9
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/* f128fa4: 8fac0048 */ lw $t4,0x48($sp)
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/* f128fa8: 010d7821 */ addu $t7,$t0,$t5
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/* f128fac: 000857c3 */ sra $t2,$t0,0x1f
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/* f128fb0: 01ed082b */ sltu $at,$t7,$t5
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/* f128fb4: 002a7021 */ addu $t6,$at,$t2
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/* f128fb8: 01cc7021 */ addu $t6,$t6,$t4
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/* f128fbc: afae0048 */ sw $t6,0x48($sp)
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/* f128fc0: afaf004c */ sw $t7,0x4c($sp)
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/* f128fc4: 0c004b87 */ jal func00012e1c
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/* f128fc8: 02402025 */ or $a0,$s2,$zero
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/* f128fcc: 26100001 */ addiu $s0,$s0,0x1
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/* f128fd0: 26310007 */ addiu $s1,$s1,0x7
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/* f128fd4: 1615ffef */ bne $s0,$s5,.L0f128f94
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/* f128fd8: 02629826 */ xor $s3,$s3,$v0
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/* f128fdc: 8fa70058 */ lw $a3,0x58($sp)
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.L0f128fe0:
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/* f128fe0: 26b0ffff */ addiu $s0,$s5,-1
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/* f128fe4: 0207082b */ sltu $at,$s0,$a3
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/* f128fe8: 14200014 */ bnez $at,.L0f12903c
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/* f128fec: 27b20048 */ addiu $s2,$sp,0x48
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/* f128ff0: 24f5ffff */ addiu $s5,$a3,-1
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.L0f128ff4:
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/* f128ff4: 92090000 */ lbu $t1,0x0($s0)
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/* f128ff8: 8fab004c */ lw $t3,0x4c($sp)
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/* f128ffc: 3238000f */ andi $t8,$s1,0xf
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/* f129000: 0309c804 */ sllv $t9,$t1,$t8
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/* f129004: 8faa0048 */ lw $t2,0x48($sp)
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/* f129008: 032b6821 */ addu $t5,$t9,$t3
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/* f12900c: 001947c3 */ sra $t0,$t9,0x1f
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/* f129010: 01ab082b */ sltu $at,$t5,$t3
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/* f129014: 00286021 */ addu $t4,$at,$t0
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/* f129018: 018a6021 */ addu $t4,$t4,$t2
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/* f12901c: afac0048 */ sw $t4,0x48($sp)
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/* f129020: afad004c */ sw $t5,0x4c($sp)
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/* f129024: 0c004b87 */ jal func00012e1c
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/* f129028: 02402025 */ or $a0,$s2,$zero
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/* f12902c: 2610ffff */ addiu $s0,$s0,-1
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/* f129030: 26310003 */ addiu $s1,$s1,0x3
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/* f129034: 1615ffef */ bne $s0,$s5,.L0f128ff4
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/* f129038: 0282a026 */ xor $s4,$s4,$v0
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.L0f12903c:
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/* f12903c: 8fae0060 */ lw $t6,0x60($sp)
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/* f129040: add30000 */ sw $s3,0x0($t6)
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/* f129044: add40004 */ sw $s4,0x4($t6)
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/* f129048: 8fbf002c */ lw $ra,0x2c($sp)
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/* f12904c: 8fb50028 */ lw $s5,0x28($sp)
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/* f129050: 8fb40024 */ lw $s4,0x24($sp)
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/* f129054: 8fb30020 */ lw $s3,0x20($sp)
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/* f129058: 8fb2001c */ lw $s2,0x1c($sp)
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/* f12905c: 8fb10018 */ lw $s1,0x18($sp)
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/* f129060: 8fb00014 */ lw $s0,0x14($sp)
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/* f129064: 03e00008 */ jr $ra
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/* f129068: 27bd0058 */ addiu $sp,$sp,0x58
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);
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void crcCalculateU32Pair(u8 *start, u8 *end, u32 *checksum)
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{
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u8 *ptr;
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u32 salt = 0;
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u64 seed = 0x8f809f473108b3c1;
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u32 sum1 = 0;
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u32 sum2 = 0;
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for (ptr = start; ptr < end; ptr++, salt += 7) {
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seed += *ptr << (salt & 0x0f);
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sum1 ^= rngRotateSeed(&seed);
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}
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for (ptr = end - 1; ptr >= start; ptr--, salt += 3) {
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seed += *ptr << (salt & 0x0f);
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sum2 ^= rngRotateSeed(&seed);
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}
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checksum[0] = sum1;
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checksum[1] = sum2;
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}
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void crcCalculateU16Pair(u8 *start, u8 *end, u16 *checksum)
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{
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@ -105,12 +40,12 @@ void crcCalculateU16Pair(u8 *start, u8 *end, u16 *checksum)
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for (ptr = start; ptr < end; ptr++, salt += 7) {
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seed += *ptr << (salt & 0x0f);
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sum1 ^= func00012e1c(&seed);
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sum1 ^= rngRotateSeed(&seed);
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}
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for (ptr = end - 1; ptr >= start; ptr--, salt += 3) {
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seed += *ptr << (salt & 0x0f);
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sum2 ^= func00012e1c(&seed);
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sum2 ^= rngRotateSeed(&seed);
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}
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checksum[0] = sum1 & 0xffff;
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@ -446,7 +446,7 @@ struct waygroup *func0f114810(s32 *groupnums, s32 value, u32 mask)
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} else {
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u64 sp50 = ((u64)g_WaypointHashes[0] << 32) | g_WaypointHashes[1];
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if (func00012e1c(&sp50) % 2 == 0) {
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if (rngRotateSeed(&sp50) % 2 == 0) {
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break;
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}
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}
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@ -567,7 +567,7 @@ struct waypoint *func0f114b7c(s32 *pointnums, s32 arg1, s32 groupnum, u32 mask)
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} else {
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u64 sp50 = ((u64)g_WaypointHashes[0] << 32) | g_WaypointHashes[1];
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if (func00012e1c(&sp50) % 2 == 0) {
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if (rngRotateSeed(&sp50) % 2 == 0) {
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break;
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}
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}
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@ -727,7 +727,7 @@ void func0f11505c(struct waygroup *groupa, struct waygroup *groupb, struct waypo
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} else {
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u64 sp50 = ((u64)g_WaypointHashes[0] << 32) | g_WaypointHashes[1];
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if ((func00012e1c(&sp50) % 2) == 0) {
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if ((rngRotateSeed(&sp50) % 2) == 0) {
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break;
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}
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}
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@ -4,7 +4,7 @@
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#include "data.h"
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#include "types.h"
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u32 func0f128f30(void);
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void crcCalculateU32Pair(u8 *start, u8 *end, u32 *checksum);
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void crcCalculateU16Pair(u8 *start, u8 *end, u16 *checksum);
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u32 func0f1291b0(void);
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u32 func0f1291f8(void);
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@ -6,6 +6,6 @@
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u32 random(void);
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void rngSetSeed(u32 seed);
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u32 func00012e1c(u64 *value);
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u32 rngRotateSeed(u64 *value);
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#endif
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@ -49,7 +49,7 @@ glabel rngSetSeed
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);
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GLOBAL_ASM(
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glabel func00012e1c
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glabel rngRotateSeed
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/* 12e1c: dc870000 */ ld $a3,0x0($a0)
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/* 12e20: 000737fc */ dsll32 $a2,$a3,0x1f
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/* 12e24: 00072ff8 */ dsll $a1,$a3,0x1f
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