103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
#include "global.h"
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#include <string.h>
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u8 sYaz0DataBuffer[0x400];
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uintptr_t sYaz0CurDataEnd;
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uintptr_t sYaz0CurRomStart;
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u32 sYaz0CurSize;
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uintptr_t sYaz0MaxPtr;
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void* Yaz0_FirstDMA(void) {
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u32 pad0;
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u32 pad1;
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u32 dmaSize;
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u32 curSize;
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sYaz0MaxPtr = sYaz0CurDataEnd - 0x19;
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curSize = sYaz0CurDataEnd - (uintptr_t)sYaz0DataBuffer;
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dmaSize = (curSize > sYaz0CurSize) ? sYaz0CurSize : curSize;
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DmaMgr_DmaRomToRam(sYaz0CurRomStart, sYaz0DataBuffer, dmaSize);
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sYaz0CurRomStart += dmaSize;
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sYaz0CurSize -= dmaSize;
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return sYaz0DataBuffer;
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}
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void* Yaz0_NextDMA(void* curSrcPos) {
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u8* dst;
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u32 restSize;
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u32 dmaSize;
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restSize = sYaz0CurDataEnd - (uintptr_t)curSrcPos;
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dst = (restSize & 7) ? (sYaz0DataBuffer - (restSize & 7)) + 8 : sYaz0DataBuffer;
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memcpy(dst, curSrcPos, restSize);
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dmaSize = (sYaz0CurDataEnd - (uintptr_t)dst) - restSize;
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if (sYaz0CurSize < dmaSize) {
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dmaSize = sYaz0CurSize;
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}
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if (dmaSize != 0) {
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DmaMgr_DmaRomToRam(sYaz0CurRomStart, (uintptr_t)dst + restSize, dmaSize);
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sYaz0CurRomStart += dmaSize;
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sYaz0CurSize -= dmaSize;
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if (!sYaz0CurSize) {
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sYaz0MaxPtr = (uintptr_t)dst + restSize + dmaSize;
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}
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}
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return dst;
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}
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void Yaz0_DecompressImpl(Yaz0Header* hdr, u8* dst) {
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u32 bitIdx = 0;
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u8* src = (u8*)hdr->data;
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u8* dstEnd = dst + hdr->decSize;
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u32 chunkHeader;
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u32 nibble;
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u8* backPtr;
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u32 chunkSize;
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u32 off;
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do {
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if (bitIdx == 0) {
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if ((sYaz0MaxPtr < (uintptr_t)src) && (sYaz0CurSize != 0)) {
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src = Yaz0_NextDMA(src);
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}
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chunkHeader = *src++;
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bitIdx = 8;
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}
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if (chunkHeader & (1 << 7)) { // uncompressed
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*dst = *src;
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dst++;
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src++;
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} else { // compressed
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off = ((*src & 0xF) << 8 | *(src + 1));
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nibble = *src >> 4;
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backPtr = dst - off;
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src += 2;
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chunkSize = (nibble == 0) // N = chunkSize; B = back offset
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? (u32)(*src++ + 0x12) // 3 bytes 0B BB NN
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: nibble + 2; // 2 bytes NB BB
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do {
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*dst++ = *(backPtr++ - 1);
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chunkSize--;
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} while (chunkSize != 0);
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}
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chunkHeader <<= 1;
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bitIdx--;
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} while (dst != dstEnd);
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}
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void Yaz0_Decompress(uintptr_t romStart, void* dst, size_t size) {
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sYaz0CurRomStart = romStart;
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sYaz0CurSize = size;
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sYaz0CurDataEnd = sYaz0DataBuffer + sizeof(sYaz0DataBuffer);
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Yaz0_DecompressImpl(Yaz0_FirstDMA(), dst);
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}
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