mirror of
https://github.com/zeldaret/oot.git
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c521f1f8ae
* Remove gSystemHeap and use _buffersSegmentEnd instead, make buffer alignments explicit for gcc * ALIGNEDn -> ALIGNED(n), reposition alignment attribute for PreNmiBuff * Correct positioning of ALIGNED for filter data in audio/lib/data.c * Add ALIGNED to TypenameMacros * ALIGNED(4) on same line for PreNmiBuff * Revert audio load.c change, to be submitted separately
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
#include "global.h"
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ALIGNED(16) u8 sYaz0DataBuffer[0x400];
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u8* sYaz0DataBufferEnd;
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uintptr_t sYaz0CurRomStart;
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size_t sYaz0CurSize;
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u8* sYaz0MaxPtr;
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void* Yaz0_FirstDMA(void) {
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s32 pad[2];
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size_t dmaSize;
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size_t bufferSize;
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sYaz0MaxPtr = sYaz0DataBufferEnd - 0x19;
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bufferSize = sYaz0DataBufferEnd - sYaz0DataBuffer;
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dmaSize = (bufferSize > sYaz0CurSize) ? sYaz0CurSize : bufferSize;
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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(u8* curSrcPos) {
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u8* dst;
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size_t restSize;
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size_t dmaSize;
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restSize = sYaz0DataBufferEnd - curSrcPos;
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dst = (restSize & 7) ? (sYaz0DataBuffer - (restSize & 7)) + 8 : sYaz0DataBuffer;
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bcopy(curSrcPos, dst, restSize);
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dmaSize = (sYaz0DataBufferEnd - 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, dst + restSize, dmaSize);
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sYaz0CurRomStart += dmaSize;
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sYaz0CurSize -= dmaSize;
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if (sYaz0CurSize == 0) {
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sYaz0MaxPtr = 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(u8* src, u8* dst) {
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Yaz0Header* header = (Yaz0Header*)src;
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u32 bitIdx = 0;
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u8* dstEnd = dst + header->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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src += sizeof(Yaz0Header);
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do {
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if (bitIdx == 0) {
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if ((sYaz0MaxPtr < 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, u8* dst, size_t size) {
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sYaz0CurRomStart = romStart;
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sYaz0CurSize = size;
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sYaz0DataBufferEnd = sYaz0DataBuffer + sizeof(sYaz0DataBuffer);
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Yaz0_DecompressImpl(Yaz0_FirstDMA(), dst);
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}
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