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https://github.com/pmret/papermario.git
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45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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typedef struct {
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uint32_t magic;
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uint32_t uncompressedLength;
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uint32_t opPtr;
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uint32_t dataPtr;
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} Yay0Header;
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void decompress(Yay0Header* hdr, uint8_t* srcPtr, uint8_t* dstPtr, bool isBigEndian) {
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uint8_t byte = 0, mask = 0;
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uint8_t* ctrl, * ops, * data;
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uint16_t copy, op;
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uint32_t written = 0;
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ctrl = srcPtr + sizeof(Yay0Header);
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ops = srcPtr + hdr->opPtr;
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data = srcPtr + hdr->dataPtr;
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while (written < hdr->uncompressedLength) {
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if ((mask >>= 1) == 0) {
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byte = *ctrl++;
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mask = 0x80;
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}
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if (byte & mask) {
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*dstPtr++ = *data++;
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written++;
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} else {
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op = isBigEndian ? (ops[0] << 8) | ops[1] : (ops[1] << 8) | ops[0];
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ops += 2;
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written += copy = (op >> 12) ? (2 + (op >> 12)) : (18 + *data++);
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while (copy--) {
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*dstPtr = dstPtr[-(op & 0xfff) - 1];
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dstPtr++;
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}
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}
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}
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}
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