110 lines
2.4 KiB
C++
110 lines
2.4 KiB
C++
#include "UniversalDiskImage.h"
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#include "MappedFile.h"
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#include "Buffer.h"
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using namespace ProFUSE;
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UniversalDiskImage::UniversalDiskImage(const char *name, bool readOnly) :
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DiskImage(name, readOnly)
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{
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Validate(file());
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}
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UniversalDiskImage::UniversalDiskImage(MappedFile *file) :
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DiskImage(file)
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{
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}
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UniversalDiskImage *UniversalDiskImage::Create(const char *name, size_t blocks)
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{
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// 64-byte header.
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MappedFile *file = new MappedFile(name, blocks * 512 + 64);
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Buffer header(64);
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// magic + creator
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header.pushBytes("2IMGPRFS", 8);
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// header size.
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header.push16le(64);
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// version
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header.push16le(1);
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//image format -- ProDOS order
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header.push32le(1);
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// flags
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header.push32le(0);
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// # blocks. s/b 0 unless prodos-order
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header.push32le(blocks);
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// offset to disk data
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header.push32le(64);
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// data length
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header.push32le(512 * blocks);
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// comment offset, creator, reserved -- 0.
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header.resize(64);
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std::memcpy(file->fileData(), header.buffer(), 64);
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file->setOffset(64);
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file->setBlocks(blocks);
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return new UniversalDiskImage(file);
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}
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UniversalDiskImage *UniversalDiskImage::Open(MappedFile *file)
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{
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Validate(file);
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return new UniversalDiskImage(file);
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}
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/*
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* TODO -- support dos-order & nibblized
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* TODO -- honor read-only flag.
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*
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*/
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void UniversalDiskImage::Validate(MappedFile *file)
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{
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#undef __METHOD__
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#define __METHOD__ "DavexDiskImage::Validate"
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uint8_t *data = (uint8_t *)file->fileData();
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size_t size = file->fileSize();
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bool ok = false;
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unsigned blocks = 0;
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unsigned offset = 0;
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do {
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if (size < 64) break;
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if (std::memcmp(data, "2IMG", 4)) break;
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// only prodos supported, for now...
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if (file->read32(0x0c, LittleEndian) != 1) break;
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offset = file->read32(0x20, LittleEndian);
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blocks = file->read32(0x14, LittleEndian);
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// file size == blocks * 512
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if (file->read32(0x1c, LittleEndian) != blocks * 512) break;
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if (offset + blocks * 512 > size) 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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file->reset();
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file->setOffset(offset);
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file->setBlocks(blocks);
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} |