166 lines
3.4 KiB
C++
166 lines
3.4 KiB
C++
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#include <cerrno>
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#include <cstdlib>
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#include <cstring>
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#include <unistd.h>
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#include <fcntl.h>
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#include <cstdio>
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#include <algorithm>
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#include <Device/DavexDiskImage.h>
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#include <File/MappedFile.h>
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#include <Device/Adaptor.h>
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#include <Endian/Endian.h>
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#include <Endian/IOBuffer.h>
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#include <Cache/MappedBlockCache.h>
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using namespace Device;
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using namespace LittleEndian;
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using ProFUSE::Exception;
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using ProFUSE::POSIXException;
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/*
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http://www.umich.edu/~archive/apple2/technotes/ftn/FTN.E0.8004
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*/
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static const char *IdentityCheck = "\x60VSTORE [Davex]\x00";
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// private, validation already performed.
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DavexDiskImage::DavexDiskImage(MappedFile *file) :
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DiskImage(file)
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{
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// at this point, file is no longer valid.
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// 512-bytes header
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setBlocks((length() / 512) - 1);
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setAdaptor(new POAdaptor(512 + (uint8_t *)address()));
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}
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DavexDiskImage::~DavexDiskImage()
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{
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// scan and update usedBlocks?
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}
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void DavexDiskImage::Validate(MappedFile *f)
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{
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#undef __METHOD__
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#define __METHOD__ "DavexDiskImage::Validate"
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size_t size = f->length();
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const void * data = f->address();
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bool ok = false;
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unsigned blocks = (size / 512) - 1;
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do {
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if (size < 512) break;
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if (size % 512) break;
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// identity.
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if (std::memcmp(data, IdentityCheck, 16))
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break;
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// file format.
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if (Read8(data, 0x10) != 0)
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break;
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// total blocks
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if (Read32(data, 33) != blocks)
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break;
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// file number -- must be 1
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if (Read8(data, 64) != 1)
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break;
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ok = true;
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} while (false);
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if (!ok)
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throw Exception(__METHOD__ ": Invalid file format.");
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}
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DavexDiskImage *DavexDiskImage::Open(MappedFile *file)
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{
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#undef __METHOD__
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#define __METHOD__ "DavexDiskImage::Open"
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Validate(file);
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return new DavexDiskImage(file);
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}
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DavexDiskImage *DavexDiskImage::Create(const char *name, size_t blocks)
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{
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return Create(name, blocks, "Untitled");
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}
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DavexDiskImage *DavexDiskImage::Create(const char *name, size_t blocks, const char *vname)
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{
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#undef __METHOD__
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#define __METHOD__ "DavexDiskImage::Create"
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uint8_t *data;
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uint8_t tmp[512];
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IOBuffer header(tmp,512);
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MappedFile *file = MappedFile::Create(name, blocks * 512 + 512);
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data = (uint8_t *)file->address();
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header.writeBytes(IdentityCheck, 16);
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// file Format
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header.write8(0);
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//version
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header.write8(0);
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// version
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header.write8(0x10);
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// reserved.
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header.setOffset(32, true);
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//deviceNum
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header.write8(1);
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// total blocks
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header.write32(blocks);
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// unused blocks
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header.write32(0);
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// volume Name
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if (!vname || !*vname) vname = "Untitled";
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unsigned l = std::strlen(vname);
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header.write8(std::min(l, 15u));
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header.writeBytes(vname, std::min(l, 15u));
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// name + reserved.
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header.setOffset(64, true);
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// file number
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header.write8(1);
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//starting block
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header.write32(0);
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// reserved
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header.setOffset(512, true);
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std::memcpy(file->address(), header.buffer(), 512);
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file->sync();
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return new DavexDiskImage(file);
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}
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BlockCache *DavexDiskImage::createBlockCache()
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{
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return new MappedBlockCache(this, 512 + (uint8_t *)address());
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}
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