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 <!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/.cargo/registry/src/github.com-1ecc6299db9ec823/snap-0.2.5/src/error.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>error.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="../../snap/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="../../snap/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="kw">use </span>std::error;
 <span class="kw">use </span>std::fmt;
 <span class="kw">use </span>std::io;
 <span class="kw">use </span>std::result;

 <span class="doccomment">/// A convenient type alias for `Result&lt;T, snap::Error&gt;`.
 </span><span class="kw">pub type </span><span class="prelude-ty">Result</span>&lt;T&gt; = result::Result&lt;T, Error&gt;;

 <span class="doccomment">/// `IntoInnerError` occurs when consuming a `Writer` fails.
 ///
 /// Consuming the `Writer` causes a flush to happen. If the flush fails, then
 /// this error is returned, which contains both the original `Writer` and
 /// the error that occurred.
 ///
 /// The type parameter `W` is the unconsumed writer.
 </span><span class="kw">pub struct </span>IntoInnerError&lt;W&gt; {
     wtr: W,
     err: io::Error,
 }

 <span class="doccomment">/// Creates a new `IntoInnerError`.
 ///
 /// (This is a visibility hack. It&#39;s public in this module, but not in the
 /// crate.)
 </span><span class="kw">pub fn </span>new_into_inner_error&lt;W&gt;(wtr: W, err: io::Error) -&gt; IntoInnerError&lt;W&gt; {
     IntoInnerError { wtr: wtr, err: err }
 }

 <span class="kw">impl</span>&lt;W&gt; IntoInnerError&lt;W&gt; {
     <span class="doccomment">/// Returns the error which caused the call to `into_inner` to fail.
     ///
     /// This error was returned when attempting to flush the internal buffer.
     </span><span class="kw">pub fn </span>error(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>io::Error {
         <span class="kw-2">&amp;</span><span class="self">self</span>.err
     }

     <span class="doccomment">/// Returns the underlying writer which generated the error.
     ///
     /// The returned value can be used for error recovery, such as
     /// re-inspecting the buffer.
     </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -&gt; W {
         <span class="self">self</span>.wtr
     }
 }

 <span class="kw">impl</span>&lt;W: ::std::any::Any&gt; error::Error <span class="kw">for </span>IntoInnerError&lt;W&gt; {
     <span class="kw">fn </span>description(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="self">self</span>.err.description()
     }

     <span class="kw">fn </span>cause(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>error::Error&gt; {
         <span class="self">self</span>.err.cause()
     }
 }

 <span class="kw">impl</span>&lt;W&gt; fmt::Display <span class="kw">for </span>IntoInnerError&lt;W&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="self">self</span>.err.fmt(f)
     }
 }

 <span class="kw">impl</span>&lt;W&gt; fmt::Debug <span class="kw">for </span>IntoInnerError&lt;W&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="self">self</span>.err.fmt(f)
     }
 }

 <span class="doccomment">/// Error describes all the possible errors that may occur during Snappy
 /// compression or decompression.
 ///
 /// Note that it&#39;s unlikely that you&#39;ll need to care about the specific error
 /// reported since all of them indicate a corrupt Snappy data or a limitation
 /// that cannot be worked around. Therefore,
 /// `From&lt;snap::Error&gt; for std::io::Error` is provided so that any Snappy
 /// errors will be converted to a `std::io::Error` automatically when using
 /// `try!`.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub enum </span>Error {
     <span class="doccomment">/// This error occurs when the given input is too big. This can happen
     /// during compression or decompression.
     </span>TooBig {
         <span class="doccomment">/// The size of the given input.
         </span>given: u64,
         <span class="doccomment">/// The maximum allowed size of an input buffer.
         </span>max: u64,
     },
     <span class="doccomment">/// This error occurs when the given buffer is too small to contain the
     /// maximum possible compressed bytes or the total number of decompressed
     /// bytes.
     </span>BufferTooSmall {
         <span class="doccomment">/// The size of the given output buffer.
         </span>given: u64,
         <span class="doccomment">/// The minimum size of the output buffer.
         </span>min: u64,
     },
     <span class="doccomment">/// This error occurs when trying to decompress a zero length buffer.
     </span>Empty,
     <span class="doccomment">/// This error occurs when an invalid header is found during decompression.
     </span>Header,
     <span class="doccomment">/// This error occurs when there is a mismatch between the number of
     /// decompressed bytes reported in the header and the number of
     /// actual decompressed bytes. In this error case, the number of actual
     /// decompressed bytes is always less than the number reported in the
     /// header.
     </span>HeaderMismatch {
         <span class="doccomment">/// The total number of decompressed bytes expected (i.e., the header
         /// value).
         </span>expected_len: u64,
         <span class="doccomment">/// The total number of actual decompressed bytes.
         </span>got_len: u64,
     },
     <span class="doccomment">/// This error occurs during decompression when there was a problem
     /// reading a literal.
     </span>Literal {
         <span class="doccomment">/// The expected length of the literal.
         </span>len: u64,
         <span class="doccomment">/// The number of remaining bytes in the compressed bytes.
         </span>src_len: u64,
         <span class="doccomment">/// The number of remaining slots in the decompression buffer.
         </span>dst_len: u64,
     },
     <span class="doccomment">/// This error occurs during decompression when there was a problem
     /// reading a copy.
     </span>CopyRead {
         <span class="doccomment">/// The expected length of the copy (as encoded in the compressed
         /// bytes).
         </span>len: u64,
         <span class="doccomment">/// The number of remaining bytes in the compressed bytes.
         </span>src_len: u64,
     },
     <span class="doccomment">/// This error occurs during decompression when there was a problem
     /// writing a copy to the decompression buffer.
     </span>CopyWrite {
         <span class="doccomment">/// The length of the copy (i.e., the total number of bytes to be
         /// produced by this copy in the decompression buffer).
         </span>len: u64,
         <span class="doccomment">/// The number of remaining bytes in the decompression buffer.
         </span>dst_len: u64,
     },
     <span class="doccomment">/// This error occurs during decompression when an invalid copy offset
     /// is found. An offset is invalid if it is zero or if it is out of bounds.
     </span>Offset {
         <span class="doccomment">/// The offset that was read.
         </span>offset: u64,
         <span class="doccomment">/// The current position in the decompression buffer. If the offset is
         /// non-zero, then the offset must be greater than this position.
         </span>dst_pos: u64,
     },
     <span class="doccomment">/// This error occurs when a stream header chunk type was expected but got
     /// a different chunk type.
     /// This error only occurs when reading a Snappy frame formatted stream.
     </span>StreamHeader {
         <span class="doccomment">/// The chunk type byte that was read.
         </span>byte: u8,
     },
     <span class="doccomment">/// This error occurs when the magic stream headers bytes do not match
     /// what is expected.
     /// This error only occurs when reading a Snappy frame formatted stream.
     </span>StreamHeaderMismatch {
         <span class="doccomment">/// The bytes that were read.
         </span>bytes: Vec&lt;u8&gt;,
     },
     <span class="doccomment">/// This error occurs when an unsupported chunk type is seen.
     /// This error only occurs when reading a Snappy frame formatted stream.
     </span>UnsupportedChunkType {
         <span class="doccomment">/// The chunk type byte that was read.
         </span>byte: u8,
     },
     <span class="doccomment">/// This error occurs when trying to read a chunk with length greater than
     /// that supported by this library when reading a Snappy frame formatted
     /// stream.
     /// This error only occurs when reading a Snappy frame formatted stream.
     </span>UnsupportedChunkLength {
         <span class="doccomment">/// The length of the chunk encountered.
         </span>len: u64,
         <span class="doccomment">/// True when this error occured while reading the stream header.
         </span>header: bool,
     },
     <span class="doccomment">/// This error occurs when a checksum validity check fails.
     /// This error only occurs when reading a Snappy frame formatted stream.
     </span>Checksum {
         <span class="doccomment">/// The expected checksum read from the stream.
         </span>expected: u32,
         <span class="doccomment">/// The computed checksum.
         </span>got: u32,
     },
 }

 <span class="kw">impl </span>From&lt;Error&gt; <span class="kw">for </span>io::Error {
     <span class="kw">fn </span>from(err: Error) -&gt; io::Error {
         io::Error::new(io::ErrorKind::Other, err)
     }
 }

 <span class="kw">impl </span>Eq <span class="kw">for </span>Error {}

 <span class="doccomment">/// This implementation of `PartialEq` returns `false` when comparing two
 /// errors whose underlying type is `std::io::Error`.
 </span><span class="kw">impl </span>PartialEq <span class="kw">for </span>Error {
     <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Error) -&gt; bool {
         <span class="kw">use </span><span class="self">self</span>::Error::<span class="kw-2">*</span>;
         <span class="kw">match </span>(<span class="self">self</span>, other) {
             (<span class="kw-2">&amp;</span>TooBig { given: given1, max: max1 },
              <span class="kw-2">&amp;</span>TooBig { given: given2, max: max2 }) =&gt; {
                 (given1, max1) == (given2, max2)
             }
             (<span class="kw-2">&amp;</span>BufferTooSmall { given: given1, min: min1 },
              <span class="kw-2">&amp;</span>BufferTooSmall { given: given2, min: min2 }) =&gt; {
                 (given1, min1) == (given2, min2)
             }
             (<span class="kw-2">&amp;</span>Empty, <span class="kw-2">&amp;</span>Empty) |
             (<span class="kw-2">&amp;</span>Header, <span class="kw-2">&amp;</span>Header) =&gt; <span class="bool-val">true</span>,
             (<span class="kw-2">&amp;</span>HeaderMismatch { expected_len: elen1, got_len: glen1 },
              <span class="kw-2">&amp;</span>HeaderMismatch { expected_len: elen2, got_len: glen2 }) =&gt; {
                 (elen1, glen1) == (elen2, glen2)
             }
             (<span class="kw-2">&amp;</span>Literal { len: len1, src_len: src_len1, dst_len: dst_len1 },
              <span class="kw-2">&amp;</span>Literal { len: len2, src_len: src_len2, dst_len: dst_len2 }) =&gt; {
                 (len1, src_len1, dst_len1) == (len2, src_len2, dst_len2)
             }
             (<span class="kw-2">&amp;</span>CopyRead { len: len1, src_len: src_len1 },
              <span class="kw-2">&amp;</span>CopyRead { len: len2, src_len: src_len2 }) =&gt; {
                 (len1, src_len1) == (len2, src_len2)
             }
             (<span class="kw-2">&amp;</span>CopyWrite { len: len1, dst_len: dst_len1 },
              <span class="kw-2">&amp;</span>CopyWrite { len: len2, dst_len: dst_len2 }) =&gt; {
                 (len1, dst_len1) == (len2, dst_len2)
             }
             (<span class="kw-2">&amp;</span>Offset { offset: offset1, dst_pos: dst_pos1 },
              <span class="kw-2">&amp;</span>Offset { offset: offset2, dst_pos: dst_pos2 }) =&gt; {
                 (offset1, dst_pos1) == (offset2, dst_pos2)
             }
             (<span class="kw-2">&amp;</span>StreamHeader { byte: byte1 }, <span class="kw-2">&amp;</span>StreamHeader { byte: byte2 }) =&gt; {
                 byte1 == byte2
             }
             (<span class="kw-2">&amp;</span>StreamHeaderMismatch { bytes: <span class="kw-2">ref </span>bytes1 },
              <span class="kw-2">&amp;</span>StreamHeaderMismatch { bytes: <span class="kw-2">ref </span>bytes2 }) =&gt; {
                 bytes1 == bytes2
             }
             (<span class="kw-2">&amp;</span>UnsupportedChunkType { byte: byte1 },
              <span class="kw-2">&amp;</span>UnsupportedChunkType { byte: byte2 }) =&gt; {
                 byte1 == byte2
             }
             (<span class="kw-2">&amp;</span>UnsupportedChunkLength { len: len1, header: header1 },
              <span class="kw-2">&amp;</span>UnsupportedChunkLength { len: len2, header: header2 }) =&gt; {
                 (len1, header1) == (len2, header2)
             }
             (<span class="kw-2">&amp;</span>Checksum { expected: e1, got: g1 },
              <span class="kw-2">&amp;</span>Checksum { expected: e2, got: g2 }) =&gt; {
                 (e1, g1) == (e2, g2)
             }
             <span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
         }
     }
 }

 <span class="kw">impl </span>error::Error <span class="kw">for </span>Error {
     <span class="kw">fn </span>description(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             Error::TooBig { .. } =&gt; <span class="string">&quot;snappy: input buffer too big&quot;</span>,
             Error::BufferTooSmall { .. } =&gt; <span class="string">&quot;snappy: output buffer too small&quot;</span>,
             Error::Empty =&gt; <span class="string">&quot;snappy: corrupt input (empty)&quot;</span>,
             Error::Header =&gt; <span class="string">&quot;snappy: corrupt input (invalid header)&quot;</span>,
             Error::HeaderMismatch { .. } =&gt; <span class="string">&quot;snappy: corrupt input \
                                              (header mismatch)&quot;</span>,
             Error::Literal { .. } =&gt; <span class="string">&quot;snappy: corrupt input (bad literal)&quot;</span>,
             Error::CopyRead { .. } =&gt; <span class="string">&quot;snappy: corrupt input (bad copy read)&quot;</span>,
             Error::CopyWrite { .. } =&gt; <span class="string">&quot;snappy: corrupt input \
                                         (bad copy write)&quot;</span>,
             Error::Offset { .. } =&gt; <span class="string">&quot;snappy: corrupt input (bad offset)&quot;</span>,
             Error::StreamHeader { .. } =&gt; {
                 <span class="string">&quot;snappy: corrupt input (missing stream header)&quot;
             </span>}
             Error::StreamHeaderMismatch { .. } =&gt; {
                 <span class="string">&quot;snappy: corrupt input (stream header mismatch)&quot;
             </span>}
             Error::UnsupportedChunkType { .. } =&gt; {
                 <span class="string">&quot;snappy: corrupt input (unsupported chunk type)&quot;
             </span>}
             Error::UnsupportedChunkLength { header: <span class="bool-val">false</span>, .. } =&gt; {
                 <span class="string">&quot;snappy: corrupt input (unsupported chunk length)&quot;
             </span>}
             Error::UnsupportedChunkLength { header: <span class="bool-val">true</span>, .. } =&gt; {
                 <span class="string">&quot;snappy: corrupt input (invalid stream header)&quot;
             </span>}
             Error::Checksum { .. } =&gt; <span class="string">&quot;snappy: corrupt input (bad checksum)&quot;</span>,
         }
     }

     <span class="kw">fn </span>cause(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>error::Error&gt; {
         <span class="prelude-val">None
     </span>}
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Error {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             Error::TooBig { given, max } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: input buffer (size = {}) is larger than \
                            allowed (size = {})&quot;</span>, given, max)
             }
             Error::BufferTooSmall { given, min } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: output buffer (size = {}) is smaller than \
                            required (size = {})&quot;</span>, given, min)
             }
             Error::Empty =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (empty)&quot;</span>)
             }
             Error::Header =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (invalid header)&quot;</span>)
             }
             Error::HeaderMismatch { expected_len, got_len } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (header mismatch; expected \
                            {} decompressed bytes but got {})&quot;</span>,
                            expected_len, got_len)
             }
             Error::Literal { len, src_len, dst_len } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (expected literal read of \
                            length {}; remaining src: {}; remaining dst: {})&quot;</span>,
                        len, src_len, dst_len)
             }
             Error::CopyRead { len, src_len } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (expected copy read of \
                            length {}; remaining src: {})&quot;</span>, len, src_len)
             }
             Error::CopyWrite { len, dst_len } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (expected copy write of \
                            length {}; remaining dst: {})&quot;</span>, len, dst_len)
             }
             Error::Offset { offset, dst_pos } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (expected valid offset but \
                            got offset {}; dst position: {})&quot;</span>, offset, dst_pos)
             }
             Error::StreamHeader { byte } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (expected stream header but \
                            got unexpected chunk type byte {})&quot;</span>, byte)
             }
             Error::StreamHeaderMismatch { <span class="kw-2">ref </span>bytes } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (expected sNaPpY stream \
                            header but got {})&quot;</span>, escape(<span class="kw-2">&amp;**</span>bytes))
             }
             Error::UnsupportedChunkType { byte } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (unsupported chunk type: {})&quot;</span>,
                        byte)
             }
             Error::UnsupportedChunkLength { len, header: <span class="bool-val">false </span>} =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input \
                            (unsupported chunk length: {})&quot;</span>, len)
             }
             Error::UnsupportedChunkLength { len, header: <span class="bool-val">true </span>} =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input \
                            (invalid stream header length: {})&quot;</span>, len)
             }
             Error::Checksum { expected, got } =&gt; {
                 <span class="macro">write!</span>(f, <span class="string">&quot;snappy: corrupt input (bad checksum; \
                            expected: {}, got: {})&quot;</span>, expected, got)
             }
         }
     }
 }

 <span class="kw">fn </span>escape(bytes: <span class="kw-2">&amp;</span>[u8]) -&gt; String {
     <span class="kw">use </span>std::ascii::escape_default;
     bytes.iter().flat_map(|<span class="kw-2">&amp;</span>b| escape_default(b)).map(|b| b <span class="kw">as </span>char).collect()
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="snap" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>