profuse/Pascal/VolumeEntry.cpp

243 lines
4.7 KiB
C++

#include <memory>
#include <Pascal/File.h>
#include <ProFUSE/auto.h>
#include <ProFUSE/Exception.h>
#include <Endian/Endian.h>
#include <Endian/IOBuffer.h>
#include <Device/BlockDevice.h>
#include <Cache/BlockCache.h>
#pragma mark -
#pragma mark VolumeEntry
using namespace LittleEndian;
using namespace Pascal;
using namespace Device;
unsigned VolumeEntry::ValidName(const char *cp)
{
// 7 chars max. Legal values: ascii, printable,
// no space/tab,
// no $=?,:
return Entry::ValidName(cp, 7);
}
VolumeEntry::VolumeEntry()
{
_fileNameLength = 0;
std::memset(_fileName, 0, 8);
_lastVolumeBlock = 0;
_fileCount = 0;
_accessTime = 0;
setInode(1);
_inodeGenerator = 1;
_cache = NULL;
_device = NULL;
}
VolumeEntry::VolumeEntry(const char *name, Device::BlockDevice *device)
{
#undef __METHOD__
#define __METHOD__ "VolumeEntry::VolumeEntry"
unsigned length;
length = ValidName(name);
if (!length)
throw ProFUSE::Exception(__METHOD__ ": Invalid volume name.");
_firstBlock = 0;
_lastBlock = 6;
_fileKind = kUntypedFile;
_inode = 1;
_inodeGenerator = 1;
_fileNameLength = length;
std::memset(_fileName, 0, sizeof(_fileName));
for (unsigned i = 0; i < _fileNameLength; ++i)
{
_fileName[i] = std::toupper(name[i]);
}
_lastVolumeBlock = device->blocks();
_fileCount = 0;
_accessTime = 0;
_lastBoot = Date::Today();
_cache = BlockCache::Create(device);
_device = device;
for (unsigned i = 2; i < 6; ++i)
{
_cache->zeroBlock(i);
}
void *vp = _cache->acquire(2);
IOBuffer b(vp, 0x1a);
writeDirectoryEntry(&b);
_cache->release(2, true);
_cache->sync();
}
VolumeEntry::VolumeEntry(Device::BlockDevice *device)
{
ProFUSE::auto_array<uint8_t> buffer(new uint8_t[512]);
unsigned blockCount;
// read the header block, then load up all the header
// blocks.
_device = device;
_cache = BlockCache::Create(device);
_cache->read(2, buffer.get());
init(buffer.get());
// todo -- verify reasonable values.
//printf("%u %u\n", blocks(), _lastBlock - _firstBlock);
blockCount = blocks();
if (blockCount > 1)
{
buffer.reset(new uint8_t[512 * blockCount]);
for (unsigned i = 0; i < blockCount; ++i)
{
_cache->read(2 + i, buffer.get() + 512 * i);
}
}
// now load up all the children.
// if this throws, memory could be lost...
try
{
for (unsigned i = 1; i <= _fileCount; ++i)
{
std::auto_ptr<FileEntry> child;
//
child.reset(new FileEntry(buffer.get() + i * 0x1a));
child->setInode(++_inodeGenerator);
child->_parent = this;
_files.push_back(child.release());
}
}
catch (...)
{
std::vector<FileEntry *>::iterator iter;
for(iter = _files.begin(); iter != _files.end(); ++iter)
{
if (*iter) delete *iter;
}
throw;
}
}
VolumeEntry::~VolumeEntry()
{
std::vector<FileEntry *>::iterator iter;
for(iter = _files.begin(); iter != _files.end(); ++iter)
{
if (*iter) delete *iter;
}
delete _cache;
// _device is deleted by _cache.
//delete _device;
}
void VolumeEntry::init(void *vp)
{
Entry::init(vp);
_fileNameLength = Read8(vp, 6);
// verify filenamelength <= 7
// verify fileKind == 0
std::memcpy(_fileName, 7 + (uint8_t *)vp, _fileNameLength);
_lastVolumeBlock = Read16(vp, 0x0e);
_fileCount = Read16(vp, 0x10);
_accessTime = Read16(vp, 0x12);
_lastBoot = Date(Read16(vp, 0x14));
setInode(1);
_inodeGenerator = 1;
}
FileEntry *VolumeEntry::fileAtIndex(unsigned i) const
{
return i < _files.size() ? _files[i] : NULL;
}
void *VolumeEntry::loadBlock(unsigned block)
{
return _cache->acquire(block);
}
void VolumeEntry::unloadBlock(unsigned block, bool dirty)
{
return _cache->release(block, dirty);
}
void VolumeEntry::readBlock(unsigned block, void *buffer)
{
_cache->read(block, buffer);
}
void VolumeEntry::writeBlock(unsigned block, void *buffer)
{
_cache->write(block, buffer);
}
void VolumeEntry::sync()
{
_cache->sync();
}
void VolumeEntry::writeDirectoryEntry(IOBuffer *b)
{
Entry::writeDirectoryEntry(b);
b->write8(0); // reserved
b->write8(_fileNameLength);
b->writeBytes(_fileName, 7);
b->write16(_lastVolumeBlock);
b->write16(_fileCount);
b->write16(_accessTime);
b->write16(_lastBoot);
// rest is reserved.
b->writeZero(4);
}