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80 lines
1.7 KiB
C++
80 lines
1.7 KiB
C++
#include "lib/core/globals.h"
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#include <string.h>
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#include "lib/core/bytes.h"
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#include "lib/external/ldbs.h"
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LDBS::LDBS() {}
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uint32_t LDBS::put(const Bytes& data, uint32_t type)
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{
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uint32_t address = top;
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Block& block = blocks[address];
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block.type = type;
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block.data = data;
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top += data.size() + 20;
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return address;
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}
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uint32_t LDBS::read(const Bytes& data)
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{
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ByteReader br(data);
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br.seek(0);
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if ((br.read_be32() != LDBS_FILE_MAGIC) ||
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(br.read_be32() != LDBS_FILE_TYPE))
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error("not a valid LDBS file");
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uint32_t address = br.read_le32();
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br.skip(4);
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uint32_t trackDirectory = br.read_le32();
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while (address)
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{
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br.seek(address);
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if (br.read_be32() != LDBS_BLOCK_MAGIC)
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error("invalid block at address 0x{:x}", address);
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Block& block = blocks[address];
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block.type = br.read_be32();
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uint32_t size = br.read_le32();
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br.skip(4);
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address = br.read_le32();
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block.data.writer().append(br.read(size));
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}
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top = data.size();
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return trackDirectory;
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}
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const Bytes LDBS::write(uint32_t trackDirectory)
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{
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Bytes data(top);
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ByteWriter bw(data);
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uint32_t previous = 0;
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for (const auto& e : blocks)
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{
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bw.seek(e.first);
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bw.write_be32(LDBS_BLOCK_MAGIC);
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bw.write_be32(e.second.type);
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bw.write_le32(e.second.data.size());
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bw.write_le32(e.second.data.size());
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bw.write_le32(previous);
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bw.append(e.second.data);
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previous = e.first;
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}
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bw.seek(0);
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bw.write_be32(LDBS_FILE_MAGIC);
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bw.write_be32(LDBS_FILE_TYPE);
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bw.write_le32(previous);
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bw.write_le32(0);
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bw.write_le32(trackDirectory);
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return data;
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}
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