| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/sunhe/incubator-teaclave/third_party/rust-sgx-sdk/sgx_protected_fs/tfs/src/sys/file/read.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>read.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../sgx_tprotected_fs/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../sgx_tprotected_fs/index.html"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License.. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::sys::error::FsResult; |
| <span class="kw">use </span><span class="kw">crate</span>::sys::file::FileInner; |
| <span class="kw">use </span><span class="kw">crate</span>::sys::metadata::MD_USER_DATA_SIZE; |
| <span class="kw">use </span><span class="kw">crate</span>::sys::node::NODE_SIZE; |
| <span class="kw">use </span>sgx_types::error::errno::EACCES; |
| <span class="kw">use </span>sgx_types::error::SgxStatus; |
| <span class="kw">use </span>std::io::SeekFrom; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"tfs"</span>)] |
| </span><span class="kw">use </span>sgx_trts::trts::EnclaveRange; |
| |
| <span class="kw">impl </span>FileInner { |
| <span class="kw">pub fn </span>read(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8]) -> FsResult<usize> { |
| <span class="kw">if </span>buf.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="number">0</span>); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"tfs"</span>)] |
| </span><span class="macro">ensure!</span>(buf.is_enclave_range(), <span class="macro">esgx!</span>(SgxStatus::InvalidParameter)); |
| <span class="macro">ensure!</span>(<span class="self">self</span>.status.is_ok(), <span class="macro">esgx!</span>(SgxStatus::BadStatus)); |
| <span class="macro">ensure!</span>(<span class="self">self</span>.opts.read || <span class="self">self</span>.opts.update, <span class="macro">eos!</span>(EACCES)); |
| |
| <span class="kw">if </span><span class="self">self</span>.end_of_file { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="number">0</span>); |
| } |
| <span class="kw">let </span>file_size = <span class="self">self</span>.metadata.encrypted_plain.size; |
| <span class="kw">if </span><span class="self">self</span>.offset == file_size { |
| <span class="self">self</span>.end_of_file = <span class="bool-val">true</span>; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="number">0</span>); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>left_to_read = buf.len(); |
| <span class="kw">if </span>left_to_read > file_size - <span class="self">self</span>.offset { |
| left_to_read = file_size - <span class="self">self</span>.offset; |
| } |
| <span class="kw">let </span>attempted_to_read = left_to_read; |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0</span>; |
| |
| <span class="kw">if </span><span class="self">self</span>.offset < MD_USER_DATA_SIZE { |
| <span class="kw">let </span>len = left_to_read.min(MD_USER_DATA_SIZE - <span class="self">self</span>.offset); |
| buf[offset..offset + len].copy_from_slice( |
| <span class="kw-2">&</span><span class="self">self</span>.metadata.encrypted_plain.data[<span class="self">self</span>.offset..<span class="self">self</span>.offset + len], |
| ); |
| offset += len; |
| left_to_read -= len; |
| <span class="self">self</span>.offset += len; |
| } |
| |
| <span class="kw">while </span>left_to_read > <span class="number">0 </span>{ |
| <span class="kw">let </span>file_node = <span class="kw">match </span><span class="self">self</span>.get_data_node() { |
| <span class="prelude-val">Ok</span>(node) => node, |
| <span class="prelude-val">Err</span>(error) => { |
| <span class="self">self</span>.set_last_error(error); |
| <span class="kw">break</span>; |
| } |
| }; |
| |
| <span class="kw">let </span>offset_in_node = (<span class="self">self</span>.offset - MD_USER_DATA_SIZE) % NODE_SIZE; |
| <span class="kw">let </span>len = left_to_read.min(NODE_SIZE - offset_in_node); |
| buf[offset..offset + len].copy_from_slice( |
| <span class="kw-2">&</span>file_node.borrow().plaintext.as_ref()[offset_in_node..offset_in_node + len], |
| ); |
| offset += len; |
| left_to_read -= len; |
| <span class="self">self</span>.offset += len; |
| } |
| |
| <span class="comment">// user wanted to read more and we had to shrink the request |
| </span><span class="kw">if </span>left_to_read == <span class="number">0 </span>&& attempted_to_read != buf.len() { |
| <span class="macro">assert!</span>(<span class="self">self</span>.offset == file_size); |
| <span class="self">self</span>.end_of_file = <span class="bool-val">true</span>; |
| } |
| |
| <span class="prelude-val">Ok</span>(attempted_to_read - left_to_read) |
| } |
| |
| <span class="kw">pub fn </span>read_at(<span class="kw-2">&mut </span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8], offset: u64) -> FsResult<usize> { |
| <span class="kw">let </span>cur_offset = <span class="self">self</span>.offset; |
| <span class="kw">let </span>file_size = <span class="self">self</span>.metadata.encrypted_plain.size <span class="kw">as </span>u64; |
| |
| <span class="kw">if </span>offset > file_size { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="number">0</span>); |
| } |
| |
| <span class="self">self</span>.seek(SeekFrom::Start(offset))<span class="question-mark">?</span>; |
| <span class="kw">let </span>result = <span class="self">self</span>.read(buf); |
| <span class="self">self</span>.offset = cur_offset; |
| |
| result |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="sgx_tprotected_fs" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |