138 lines
3.5 KiB
C++
138 lines
3.5 KiB
C++
#include <ResourceFile.h>
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#include <BinaryIO.h>
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#include <iostream>
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#include <sstream>
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#include <fstream>
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#include <cassert>
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#include <vector>
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void decompressADC(std::vector<uint8_t>& outbuf, const std::vector<uint8_t>& inbuf)
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{
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outbuf.reserve(0x40000);
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auto p = inbuf.begin();
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while(p != inbuf.end())
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{
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auto cmd = *p++;
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if(cmd & 0x80)
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{
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int n = (cmd & 0x7f) + 1;
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outbuf.insert(outbuf.end(), p, p + n);
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p += n;
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assert(p <= inbuf.end());
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}
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else
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{
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int off;
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int n;
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if(cmd & 0x40)
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{
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n = (cmd & 0x3f) + 4;
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off = *p++ << 8;
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off |= *p++;
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}
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else
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{
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n = ((cmd & 0x3c) >> 2) + 3;
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off = ((cmd & 3) << 8) | *p++;
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}
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++off;
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assert(n > 0);
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assert(off > 0);
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assert(outbuf.size() - off >= 0);
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outbuf.resize(outbuf.size() + n);
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auto dst = outbuf.end() - n;
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auto src = dst - off;
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while(n--)
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*dst++ = *src++;
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}
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}
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}
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int main(int argc, char* argv[])
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{
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if(argc != 3)
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{
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std::cerr << "Usage: ConvertDiskImage input.img output.dsk\n";
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return 1;
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}
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ResourceFile file;
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if(!file.read(argv[1]))
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{
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std::cerr << "Couldn't read input.\n";
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return 1;
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}
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std::istringstream bcem(file.resources.resources[ResRef("bcem",128)].getData());
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std::istringstream ndif(file.data);
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std::ofstream output(argv[2], std::ios::binary | std::ios::trunc);
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word(bcem);
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word(bcem);
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for(int i = 0; i<64; i++)
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byte(bcem); // volume name
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int blockCount [[maybe_unused]] = longword(bcem);
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int blockSize = longword(bcem) & ~1; // ???
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std::cout << blockCount << " blocks of " << blockSize << std::endl;
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int hhBSZeroOffset [[maybe_unused]] = longword(bcem);
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int checksum [[maybe_unused]] = longword(bcem);
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int unknown1 [[maybe_unused]] = longword(bcem);
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int unknown2 [[maybe_unused]] = longword(bcem);
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int unknown3 [[maybe_unused]] = longword(bcem);
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for(int i = 0; i < 7; i++)
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longword(bcem); // reserved
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int nChunks = longword(bcem);
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std::vector<uint8_t> inbuf;
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std::vector<uint8_t> outbuf;
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for(int i = 0; i < nChunks; i++)
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{
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unsigned tmp = longword(bcem);
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unsigned dstStartOffset = blockSize * (tmp >> 8);
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unsigned compression = tmp & 0xFF;
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unsigned offset = longword(bcem);
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unsigned size = longword(bcem);
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std::cout << std::hex << "starting at " << dstStartOffset << " from " << offset << " size " << size << " compression " << compression << std::endl;
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if(output.tellp() < dstStartOffset)
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{
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std::cout << std::hex << "zero bytes from " << output.tellp() << std::endl;
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output.seekp(dstStartOffset - 1);
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output.put(0);
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}
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inbuf.clear();
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outbuf.clear();
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inbuf.resize(size);
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ndif.seekg(offset);
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ndif.read((char*)inbuf.data(), size);
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switch(compression)
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{
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case 0:
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case 0xFF:
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break;
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case 2:
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outbuf = std::move(inbuf);
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break;
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case 0x83:
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decompressADC(outbuf, inbuf);
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break;
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}
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output.write((char*)outbuf.data(), outbuf.size());
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}
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return 0;
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}
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