mirror of https://github.com/AxioDL/metaforce.git
47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#include <cstdio>
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#include "athena/MemoryReader.hpp"
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#include "athena/FileWriter.hpp"
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#include "athena/Checksums.hpp"
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#if __BYTE_ORDER__ == __BIG_ENDIAN
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#define SBIG(q) q
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#else
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#define SBIG(q) (((q)&0x000000FF) << 24 | ((q)&0x0000FF00) << 8 | ((q)&0x00FF0000) >> 8 | ((q)&0xFF000000) >> 24)
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#endif
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int main(int argc, char* argv[]) {
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if (argc < 2) {
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printf("mpcksum <save> [output]\n");
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return 1;
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}
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athena::io::MemoryCopyReader in(argv[1]);
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std::unique_ptr<athena::io::FileWriter> out;
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if (argc > 2)
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out.reset(new athena::io::FileWriter(argv[2]));
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else
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out.reset(new athena::io::FileWriter(argv[1]));
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atUint32 magic;
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in.readUBytesToBuf(&magic, 4);
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if (magic != SBIG('GM8E') && magic != SBIG('GM8P') && magic != SBIG('GM8J')) {
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printf("Unsupported file, MP .gci file expected\n");
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return 1;
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}
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if (in.length() != 8256) {
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printf("File too small expected 8,256 bytes got %" PRIu64, in.length());
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return 1;
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}
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atUint8* data = in.data();
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atUint32 newCkSum = athena::checksums::crc32(data + 68, 8188, ~0, 0);
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*(atUint32*)(data + 64) = SBIG(newCkSum);
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out->writeBytes(data, 8256);
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delete data;
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return 0;
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}
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