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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/utility/safe_browsing/mac/dmg_iterator.h"
#include "chrome/utility/safe_browsing/mac/hfs.h"
#include "chrome/utility/safe_browsing/mac/read_stream.h"
namespace safe_browsing {
namespace dmg {
DMGIterator::DMGIterator(ReadStream* stream)
: udif_(stream),
partitions_(),
current_partition_(0),
hfs_() {
}
DMGIterator::~DMGIterator() {}
bool DMGIterator::Open() {
if (!udif_.Parse())
return false;
// Collect all the HFS partitions up-front. The data are accessed lazily, so
// this is relatively inexpensive.
for (size_t i = 0; i < udif_.GetNumberOfPartitions(); ++i) {
if (udif_.GetPartitionType(i) == "Apple_HFS" ||
udif_.GetPartitionType(i) == "Apple_HFSX") {
partitions_.push_back(udif_.GetPartitionReadStream(i));
}
}
return partitions_.size() > 0;
}
bool DMGIterator::Next() {
// Iterate through all the HFS partitions in the DMG file.
for (; current_partition_ < partitions_.size(); ++current_partition_) {
if (!hfs_) {
hfs_.reset(new HFSIterator(partitions_[current_partition_]));
if (!hfs_->Open())
continue;
}
// Iterate through the HFS filesystem until a concrete file is found.
while (true) {
if (!hfs_->Next())
break;
// Skip directories and symlinks.
if (hfs_->IsDirectory() || hfs_->IsSymbolicLink())
continue;
// Hard links are not supported by the HFSIterator.
if (hfs_->IsHardLink())
continue;
// Decmpfs compression is not supported by the HFSIterator.
if (hfs_->IsDecmpfsCompressed())
continue;
// This must be a normal file!
return true;
}
hfs_.reset();
}
return false;
}
base::string16 DMGIterator::GetPath() {
return hfs_->GetPath();
}
scoped_ptr<ReadStream> DMGIterator::GetReadStream() {
return hfs_->GetReadStream();
}
} // namespace dmg
} // namespace safe_browsing
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