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https://github.com/facebook/sapling.git
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fbdb46f5cb
Reviewed By: chadaustin Differential Revision: D17872966 fbshipit-source-id: cd60a364a2146f0dadbeca693b1d4a5d7c97ff63
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#include "eden/fs/fuse/DirList.h"
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#include "eden/fs/fuse/FuseTypes.h"
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#include "eden/fs/fuse/InodeNumber.h"
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using folly::StringPiece;
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namespace facebook {
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namespace eden {
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DirList::DirList(size_t maxSize)
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: buf_(new char[maxSize]), end_(buf_.get() + maxSize), cur_(buf_.get()) {}
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bool DirList::add(StringPiece name, ino_t inode, dtype_t type, off_t off) {
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const size_t avail = end_ - cur_;
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const auto entLength = FUSE_NAME_OFFSET + name.size();
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const auto fullSize = FUSE_DIRENT_ALIGN(entLength);
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if (fullSize > avail) {
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return false;
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}
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fuse_dirent* const dirent = reinterpret_cast<fuse_dirent*>(cur_);
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dirent->ino = inode;
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dirent->off = off;
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dirent->namelen = name.size();
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dirent->type = static_cast<decltype(dirent->type)>(type);
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memcpy(dirent->name, name.data(), name.size());
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if (fullSize > entLength) {
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// 0 out any padding
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memset(cur_ + entLength, 0, fullSize - entLength);
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}
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cur_ += fullSize;
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DCHECK_LE(cur_, end_);
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return true;
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}
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StringPiece DirList::getBuf() const {
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return StringPiece(buf_.get(), cur_ - buf_.get());
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}
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std::vector<DirList::ExtractedEntry> DirList::extract() const {
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std::vector<DirList::ExtractedEntry> result;
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char* p = buf_.get();
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while (p != cur_) {
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auto entry = reinterpret_cast<fuse_dirent*>(p);
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result.emplace_back(
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ExtractedEntry{std::string{entry->name, entry->name + entry->namelen},
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entry->ino,
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static_cast<dtype_t>(entry->type),
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static_cast<off_t>(entry->off)});
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p += FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + entry->namelen);
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}
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return result;
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}
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} // namespace eden
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} // namespace facebook
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