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fbdb46f5cb
Reviewed By: chadaustin Differential Revision: D17872966 fbshipit-source-id: cd60a364a2146f0dadbeca693b1d4a5d7c97ff63
66 lines
1.5 KiB
C++
66 lines
1.5 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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#pragma once
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#include <folly/FBVector.h>
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#include <folly/io/IOBuf.h>
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namespace facebook {
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namespace eden {
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/**
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* Represents data that may come from a buffer or a file descriptor.
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*
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* While we don't currently have a fuse client lib that supports this,
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* we want to make sure we're ready to use it, so this looks like
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* a dumb wrapper around IOBuf at the moment.
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*/
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class BufVec {
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struct Buf {
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std::unique_ptr<folly::IOBuf> buf;
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int fd{-1};
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size_t fd_size{0};
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off_t fd_pos{-1};
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Buf(const Buf&) = delete;
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Buf& operator=(const Buf&) = delete;
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Buf(Buf&&) = default;
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Buf& operator=(Buf&&) = default;
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explicit Buf(std::unique_ptr<folly::IOBuf> buf);
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};
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folly::fbvector<std::shared_ptr<Buf>> items_;
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public:
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BufVec(const BufVec&) = delete;
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BufVec& operator=(const BufVec&) = delete;
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BufVec(BufVec&&) = default;
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BufVec& operator=(BufVec&&) = default;
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explicit BufVec(std::unique_ptr<folly::IOBuf> buf);
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/**
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* Return an iovector suitable for e.g. writev()
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* auto iov = buf->getIov();
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* auto xfer = writev(fd, iov.data(), iov.size());
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*/
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folly::fbvector<struct iovec> getIov() const;
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/**
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* Returns the total number of bytes in the BufVec.
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*/
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size_t size() const;
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/**
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* Copies the buffer into a std::string.
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*/
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std::string copyData() const;
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};
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} // namespace eden
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} // namespace facebook
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