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</pre><div class="example-wrap"><pre class="rust ">
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<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">decode_config_slice</span>, <span class="ident">Config</span>, <span class="ident">DecodeError</span>};
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Read</span>;
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<span class="kw">use</span> <span class="ident">std</span>::{<span class="ident">cmp</span>, <span class="ident">fmt</span>, <span class="ident">io</span>};
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<span class="comment">// This should be large, but it has to fit on the stack.</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const</span> <span class="ident">BUF_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1024</span>;
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<span class="comment">// 4 bytes of base64 data encode 3 bytes of raw data (modulo padding).</span>
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<span class="kw">const</span> <span class="ident">BASE64_CHUNK_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">4</span>;
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<span class="kw">const</span> <span class="ident">DECODED_CHUNK_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">3</span>;
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<span class="doccomment">/// A `Read` implementation that decodes base64 data read from an underlying reader.</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// # Examples</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// ```</span>
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<span class="doccomment">/// use std::io::Read;</span>
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<span class="doccomment">/// use std::io::Cursor;</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// // use a cursor as the simplest possible `Read` -- in real code this is probably a file, etc.</span>
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<span class="doccomment">/// let mut wrapped_reader = Cursor::new(b"YXNkZg==");</span>
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<span class="doccomment">/// let mut decoder = base64::read::DecoderReader::new(</span>
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<span class="doccomment">/// &mut wrapped_reader, base64::STANDARD);</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// // handle errors as you normally would</span>
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<span class="doccomment">/// let mut result = Vec::new();</span>
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<span class="doccomment">/// decoder.read_to_end(&mut result).unwrap();</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// assert_eq!(b"asdf", &result[..]);</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// ```</span>
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<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DecoderReader</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">R</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">io</span>::<span class="ident">Read</span><span class="op">></span> {
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<span class="ident">config</span>: <span class="ident">Config</span>,
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<span class="doccomment">/// Where b64 data is read from</span>
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<span class="ident">r</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">R</span>,
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<span class="comment">// Holds b64 data read from the delegate reader.</span>
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<span class="ident">b64_buffer</span>: [<span class="ident">u8</span>; <span class="ident">BUF_SIZE</span>],
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<span class="comment">// The start of the pending buffered data in b64_buffer.</span>
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<span class="ident">b64_offset</span>: <span class="ident">usize</span>,
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<span class="comment">// The amount of buffered b64 data.</span>
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<span class="ident">b64_len</span>: <span class="ident">usize</span>,
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<span class="comment">// Since the caller may provide us with a buffer of size 1 or 2 that's too small to copy a</span>
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<span class="comment">// decoded chunk in to, we have to be able to hang on to a few decoded bytes.</span>
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<span class="comment">// Technically we only need to hold 2 bytes but then we'd need a separate temporary buffer to</span>
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<span class="comment">// decode 3 bytes into and then juggle copying one byte into the provided read buf and the rest</span>
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<span class="comment">// into here, which seems like a lot of complexity for 1 extra byte of storage.</span>
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<span class="ident">decoded_buffer</span>: [<span class="ident">u8</span>; <span class="number">3</span>],
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<span class="comment">// index of start of decoded data</span>
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<span class="ident">decoded_offset</span>: <span class="ident">usize</span>,
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<span class="comment">// length of decoded data</span>
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<span class="ident">decoded_len</span>: <span class="ident">usize</span>,
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<span class="comment">// used to provide accurate offsets in errors</span>
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<span class="ident">total_b64_decoded</span>: <span class="ident">usize</span>,
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}
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|
||||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">R</span>: <span class="ident">io</span>::<span class="ident">Read</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">DecoderReader</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">R</span><span class="op">></span> {
|
||||
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
|
||||
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"DecoderReader"</span>)
|
||||
.<span class="ident">field</span>(<span class="string">"config"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">config</span>)
|
||||
.<span class="ident">field</span>(<span class="string">"b64_offset"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">b64_offset</span>)
|
||||
.<span class="ident">field</span>(<span class="string">"b64_len"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">b64_len</span>)
|
||||
.<span class="ident">field</span>(<span class="string">"decoded_buffer"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">decoded_buffer</span>)
|
||||
.<span class="ident">field</span>(<span class="string">"decoded_offset"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">decoded_offset</span>)
|
||||
.<span class="ident">field</span>(<span class="string">"decoded_len"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">decoded_len</span>)
|
||||
.<span class="ident">field</span>(<span class="string">"total_b64_decoded"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">total_b64_decoded</span>)
|
||||
.<span class="ident">finish</span>()
|
||||
}
|
||||
}
|
||||
|
||||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">R</span>: <span class="ident">io</span>::<span class="ident">Read</span><span class="op">></span> <span class="ident">DecoderReader</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">R</span><span class="op">></span> {
|
||||
<span class="doccomment">/// Create a new decoder that will read from the provided reader `r`.</span>
|
||||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">r</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">R</span>, <span class="ident">config</span>: <span class="ident">Config</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
|
||||
<span class="ident">DecoderReader</span> {
|
||||
<span class="ident">config</span>,
|
||||
<span class="ident">r</span>,
|
||||
<span class="ident">b64_buffer</span>: [<span class="number">0</span>; <span class="ident">BUF_SIZE</span>],
|
||||
<span class="ident">b64_offset</span>: <span class="number">0</span>,
|
||||
<span class="ident">b64_len</span>: <span class="number">0</span>,
|
||||
<span class="ident">decoded_buffer</span>: [<span class="number">0</span>; <span class="ident">DECODED_CHUNK_SIZE</span>],
|
||||
<span class="ident">decoded_offset</span>: <span class="number">0</span>,
|
||||
<span class="ident">decoded_len</span>: <span class="number">0</span>,
|
||||
<span class="ident">total_b64_decoded</span>: <span class="number">0</span>,
|
||||
}
|
||||
}
|
||||
|
||||
<span class="doccomment">/// Write as much as possible of the decoded buffer into the target buffer.</span>
|
||||
<span class="doccomment">/// Must only be called when there is something to write and space to write into.</span>
|
||||
<span class="doccomment">/// Returns a Result with the number of (decoded) bytes copied.</span>
|
||||
<span class="kw">fn</span> <span class="ident">flush_decoded_buf</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">decoded_len</span> <span class="op">></span> <span class="number">0</span>);
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">0</span>);
|
||||
|
||||
<span class="kw">let</span> <span class="ident">copy_len</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">decoded_len</span>, <span class="ident">buf</span>.<span class="ident">len</span>());
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">copy_len</span> <span class="op">></span> <span class="number">0</span>);
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">copy_len</span> <span class="op"><</span><span class="op">=</span> <span class="self">self</span>.<span class="ident">decoded_len</span>);
|
||||
|
||||
<span class="ident">buf</span>[..<span class="ident">copy_len</span>].<span class="ident">copy_from_slice</span>(
|
||||
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">decoded_buffer</span>[<span class="self">self</span>.<span class="ident">decoded_offset</span>..<span class="self">self</span>.<span class="ident">decoded_offset</span> <span class="op">+</span> <span class="ident">copy_len</span>],
|
||||
);
|
||||
|
||||
<span class="self">self</span>.<span class="ident">decoded_offset</span> <span class="op">+</span><span class="op">=</span> <span class="ident">copy_len</span>;
|
||||
<span class="self">self</span>.<span class="ident">decoded_len</span> <span class="op">-</span><span class="op">=</span> <span class="ident">copy_len</span>;
|
||||
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">decoded_len</span> <span class="op"><</span> <span class="ident">DECODED_CHUNK_SIZE</span>);
|
||||
|
||||
<span class="prelude-val">Ok</span>(<span class="ident">copy_len</span>)
|
||||
}
|
||||
|
||||
<span class="doccomment">/// Read into the remaining space in the buffer after the current contents.</span>
|
||||
<span class="doccomment">/// Must only be called when there is space to read into in the buffer.</span>
|
||||
<span class="doccomment">/// Returns the number of bytes read.</span>
|
||||
<span class="kw">fn</span> <span class="ident">read_from_delegate</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">b64_len</span> <span class="op"><</span> <span class="ident">BUF_SIZE</span>);
|
||||
|
||||
<span class="kw">let</span> <span class="ident">read</span> <span class="op">=</span> <span class="self">self</span>
|
||||
.<span class="ident">r</span>
|
||||
.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">b64_buffer</span>[<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">b64_len</span>..])<span class="question-mark">?</span>;
|
||||
<span class="self">self</span>.<span class="ident">b64_len</span> <span class="op">+</span><span class="op">=</span> <span class="ident">read</span>;
|
||||
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">b64_len</span> <span class="op"><</span><span class="op">=</span> <span class="ident">BUF_SIZE</span>);
|
||||
|
||||
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">read</span>);
|
||||
}
|
||||
|
||||
<span class="doccomment">/// Decode the requested number of bytes from the b64 buffer into the provided buffer. It's the</span>
|
||||
<span class="doccomment">/// caller's responsibility to choose the number of b64 bytes to decode correctly.</span>
|
||||
<span class="doccomment">///</span>
|
||||
<span class="doccomment">/// Returns a Result with the number of decoded bytes written to `buf`.</span>
|
||||
<span class="kw">fn</span> <span class="ident">decode_to_buf</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">num_bytes</span>: <span class="ident">usize</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">b64_len</span> <span class="op">></span><span class="op">=</span> <span class="ident">num_bytes</span>);
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">b64_len</span> <span class="op"><</span><span class="op">=</span> <span class="ident">BUF_SIZE</span>);
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">></span> <span class="number">0</span>);
|
||||
|
||||
<span class="kw">let</span> <span class="ident">decoded</span> <span class="op">=</span> <span class="ident">decode_config_slice</span>(
|
||||
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">b64_buffer</span>[<span class="self">self</span>.<span class="ident">b64_offset</span>..<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">+</span> <span class="ident">num_bytes</span>],
|
||||
<span class="self">self</span>.<span class="ident">config</span>,
|
||||
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>[..],
|
||||
)
|
||||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="kw">match</span> <span class="ident">e</span> {
|
||||
<span class="ident">DecodeError</span>::<span class="ident">InvalidByte</span>(<span class="ident">offset</span>, <span class="ident">byte</span>) <span class="op">=</span><span class="op">></span> {
|
||||
<span class="ident">DecodeError</span>::<span class="ident">InvalidByte</span>(<span class="self">self</span>.<span class="ident">total_b64_decoded</span> <span class="op">+</span> <span class="ident">offset</span>, <span class="ident">byte</span>)
|
||||
}
|
||||
<span class="ident">DecodeError</span>::<span class="ident">InvalidLength</span> <span class="op">=</span><span class="op">></span> <span class="ident">DecodeError</span>::<span class="ident">InvalidLength</span>,
|
||||
<span class="ident">DecodeError</span>::<span class="ident">InvalidLastSymbol</span>(<span class="ident">offset</span>, <span class="ident">byte</span>) <span class="op">=</span><span class="op">></span> {
|
||||
<span class="ident">DecodeError</span>::<span class="ident">InvalidLastSymbol</span>(<span class="self">self</span>.<span class="ident">total_b64_decoded</span> <span class="op">+</span> <span class="ident">offset</span>, <span class="ident">byte</span>)
|
||||
}
|
||||
})
|
||||
.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">InvalidData</span>, <span class="ident">e</span>))<span class="question-mark">?</span>;
|
||||
|
||||
<span class="self">self</span>.<span class="ident">total_b64_decoded</span> <span class="op">+</span><span class="op">=</span> <span class="ident">num_bytes</span>;
|
||||
<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">+</span><span class="op">=</span> <span class="ident">num_bytes</span>;
|
||||
<span class="self">self</span>.<span class="ident">b64_len</span> <span class="op">-</span><span class="op">=</span> <span class="ident">num_bytes</span>;
|
||||
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">b64_len</span> <span class="op"><</span><span class="op">=</span> <span class="ident">BUF_SIZE</span>);
|
||||
|
||||
<span class="prelude-val">Ok</span>(<span class="ident">decoded</span>)
|
||||
}
|
||||
}
|
||||
|
||||
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">DecoderReader</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">R</span><span class="op">></span> {
|
||||
<span class="doccomment">/// Decode input from the wrapped reader.</span>
|
||||
<span class="doccomment">///</span>
|
||||
<span class="doccomment">/// Under non-error circumstances, this returns `Ok` with the value being the number of bytes</span>
|
||||
<span class="doccomment">/// written in `buf`.</span>
|
||||
<span class="doccomment">///</span>
|
||||
<span class="doccomment">/// Where possible, this function buffers base64 to minimize the number of read() calls to the</span>
|
||||
<span class="doccomment">/// delegate reader.</span>
|
||||
<span class="doccomment">///</span>
|
||||
<span class="doccomment">/// # Errors</span>
|
||||
<span class="doccomment">///</span>
|
||||
<span class="doccomment">/// Any errors emitted by the delegate reader are returned. Decoding errors due to invalid</span>
|
||||
<span class="doccomment">/// base64 are also possible, and will have `io::ErrorKind::InvalidData`.</span>
|
||||
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-</span><span class="op">></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
|
||||
<span class="kw">if</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
|
||||
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="number">0</span>);
|
||||
}
|
||||
|
||||
<span class="comment">// offset == BUF_SIZE when we copied it all last time</span>
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op"><</span><span class="op">=</span> <span class="ident">BUF_SIZE</span>);
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">b64_len</span> <span class="op"><</span><span class="op">=</span> <span class="ident">BUF_SIZE</span>);
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="kw">if</span> <span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">=</span><span class="op">=</span> <span class="ident">BUF_SIZE</span> {
|
||||
<span class="self">self</span>.<span class="ident">b64_len</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span>
|
||||
} <span class="kw">else</span> {
|
||||
<span class="self">self</span>.<span class="ident">b64_len</span> <span class="op"><</span><span class="op">=</span> <span class="ident">BUF_SIZE</span>
|
||||
});
|
||||
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="kw">if</span> <span class="self">self</span>.<span class="ident">decoded_len</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
|
||||
<span class="comment">// can be = when we were able to copy the complete chunk</span>
|
||||
<span class="self">self</span>.<span class="ident">decoded_offset</span> <span class="op"><</span><span class="op">=</span> <span class="ident">DECODED_CHUNK_SIZE</span>
|
||||
} <span class="kw">else</span> {
|
||||
<span class="self">self</span>.<span class="ident">decoded_offset</span> <span class="op"><</span> <span class="ident">DECODED_CHUNK_SIZE</span>
|
||||
});
|
||||
|
||||
<span class="comment">// We shouldn't ever decode into here when we can't immediately write at least one byte into</span>
|
||||
<span class="comment">// the provided buf, so the effective length should only be 3 momentarily between when we</span>
|
||||
<span class="comment">// decode and when we copy into the target buffer.</span>
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">decoded_len</span> <span class="op"><</span> <span class="ident">DECODED_CHUNK_SIZE</span>);
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">decoded_len</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">decoded_offset</span> <span class="op"><</span><span class="op">=</span> <span class="ident">DECODED_CHUNK_SIZE</span>);
|
||||
|
||||
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">decoded_len</span> <span class="op">></span> <span class="number">0</span> {
|
||||
<span class="comment">// we have a few leftover decoded bytes; flush that rather than pull in more b64</span>
|
||||
<span class="self">self</span>.<span class="ident">flush_decoded_buf</span>(<span class="ident">buf</span>)
|
||||
} <span class="kw">else</span> {
|
||||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">at_eof</span> <span class="op">=</span> <span class="bool-val">false</span>;
|
||||
<span class="kw">while</span> <span class="self">self</span>.<span class="ident">b64_len</span> <span class="op"><</span> <span class="ident">BASE64_CHUNK_SIZE</span> {
|
||||
<span class="comment">// Work around lack of copy_within, which is only present in 1.37</span>
|
||||
<span class="comment">// Copy any bytes we have to the start of the buffer.</span>
|
||||
<span class="comment">// We know we have < 1 chunk, so we can use a tiny tmp buffer.</span>
|
||||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">memmove_buf</span> <span class="op">=</span> [<span class="number">0_u8</span>; <span class="ident">BASE64_CHUNK_SIZE</span>];
|
||||
<span class="ident">memmove_buf</span>[..<span class="self">self</span>.<span class="ident">b64_len</span>].<span class="ident">copy_from_slice</span>(
|
||||
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">b64_buffer</span>[<span class="self">self</span>.<span class="ident">b64_offset</span>..<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">+</span> <span class="self">self</span>.<span class="ident">b64_len</span>],
|
||||
);
|
||||
<span class="self">self</span>.<span class="ident">b64_buffer</span>[<span class="number">0</span>..<span class="self">self</span>.<span class="ident">b64_len</span>].<span class="ident">copy_from_slice</span>(<span class="kw-2">&</span><span class="ident">memmove_buf</span>[..<span class="self">self</span>.<span class="ident">b64_len</span>]);
|
||||
<span class="self">self</span>.<span class="ident">b64_offset</span> <span class="op">=</span> <span class="number">0</span>;
|
||||
|
||||
<span class="comment">// then fill in more data</span>
|
||||
<span class="kw">let</span> <span class="ident">read</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">read_from_delegate</span>()<span class="question-mark">?</span>;
|
||||
<span class="kw">if</span> <span class="ident">read</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
|
||||
<span class="comment">// we never pass in an empty buf, so 0 => we've hit EOF</span>
|
||||
<span class="ident">at_eof</span> <span class="op">=</span> <span class="bool-val">true</span>;
|
||||
<span class="kw">break</span>;
|
||||
}
|
||||
}
|
||||
|
||||
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">b64_len</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">at_eof</span>);
|
||||
<span class="comment">// we must be at EOF, and we have no data left to decode</span>
|
||||
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="number">0</span>);
|
||||
};
|
||||
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="kw">if</span> <span class="ident">at_eof</span> {
|
||||
<span class="comment">// if we are at eof, we may not have a complete chunk</span>
|
||||
<span class="self">self</span>.<span class="ident">b64_len</span> <span class="op">></span> <span class="number">0</span>
|
||||
} <span class="kw">else</span> {
|
||||
<span class="comment">// otherwise, we must have at least one chunk</span>
|
||||
<span class="self">self</span>.<span class="ident">b64_len</span> <span class="op">></span><span class="op">=</span> <span class="ident">BASE64_CHUNK_SIZE</span>
|
||||
});
|
||||
|
||||
<span class="macro">debug_assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="self">self</span>.<span class="ident">decoded_len</span>);
|
||||
|
||||
<span class="kw">if</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">DECODED_CHUNK_SIZE</span> {
|
||||
<span class="comment">// caller requested an annoyingly short read</span>
|
||||
<span class="comment">// have to write to a tmp buf first to avoid double mutable borrow</span>
|
||||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">decoded_chunk</span> <span class="op">=</span> [<span class="number">0_u8</span>; <span class="ident">DECODED_CHUNK_SIZE</span>];
|
||||
<span class="comment">// if we are at eof, could have less than BASE64_CHUNK_SIZE, in which case we have</span>
|
||||
<span class="comment">// to assume that these last few tokens are, in fact, valid (i.e. must be 2-4 b64</span>
|
||||
<span class="comment">// tokens, not 1, since 1 token can't decode to 1 byte).</span>
|
||||
<span class="kw">let</span> <span class="ident">to_decode</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">b64_len</span>, <span class="ident">BASE64_CHUNK_SIZE</span>);
|
||||
|
||||
<span class="kw">let</span> <span class="ident">decoded</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">decode_to_buf</span>(<span class="ident">to_decode</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">decoded_chunk</span>[..])<span class="question-mark">?</span>;
|
||||
<span class="self">self</span>.<span class="ident">decoded_buffer</span>[..<span class="ident">decoded</span>].<span class="ident">copy_from_slice</span>(<span class="kw-2">&</span><span class="ident">decoded_chunk</span>[..<span class="ident">decoded</span>]);
|
||||
|
||||
<span class="self">self</span>.<span class="ident">decoded_offset</span> <span class="op">=</span> <span class="number">0</span>;
|
||||
<span class="self">self</span>.<span class="ident">decoded_len</span> <span class="op">=</span> <span class="ident">decoded</span>;
|
||||
|
||||
<span class="comment">// can be less than 3 on last block due to padding</span>
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">decoded</span> <span class="op"><</span><span class="op">=</span> <span class="number">3</span>);
|
||||
|
||||
<span class="self">self</span>.<span class="ident">flush_decoded_buf</span>(<span class="ident">buf</span>)
|
||||
} <span class="kw">else</span> {
|
||||
<span class="kw">let</span> <span class="ident">b64_bytes_that_can_decode_into_buf</span> <span class="op">=</span> (<span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">/</span> <span class="ident">DECODED_CHUNK_SIZE</span>)
|
||||
.<span class="ident">checked_mul</span>(<span class="ident">BASE64_CHUNK_SIZE</span>)
|
||||
.<span class="ident">expect</span>(<span class="string">"too many chunks"</span>);
|
||||
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="ident">b64_bytes_that_can_decode_into_buf</span> <span class="op">></span><span class="op">=</span> <span class="ident">BASE64_CHUNK_SIZE</span>);
|
||||
|
||||
<span class="kw">let</span> <span class="ident">b64_bytes_available_to_decode</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">at_eof</span> {
|
||||
<span class="self">self</span>.<span class="ident">b64_len</span>
|
||||
} <span class="kw">else</span> {
|
||||
<span class="comment">// only use complete chunks</span>
|
||||
<span class="self">self</span>.<span class="ident">b64_len</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">b64_len</span> <span class="op">%</span> <span class="number">4</span>
|
||||
};
|
||||
|
||||
<span class="kw">let</span> <span class="ident">actual_decode_len</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(
|
||||
<span class="ident">b64_bytes_that_can_decode_into_buf</span>,
|
||||
<span class="ident">b64_bytes_available_to_decode</span>,
|
||||
);
|
||||
<span class="self">self</span>.<span class="ident">decode_to_buf</span>(<span class="ident">actual_decode_len</span>, <span class="ident">buf</span>)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
</pre></div>
|
||||
</section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="base64"></div>
|
||||
<script src="../../../main.js"></script><script src="../../../source-script.js"></script><script src="../../../source-files.js"></script><script defer src="../../../search-index.js"></script></body></html>
|
||||
@@ -0,0 +1,19 @@
|
||||
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|
||||
<link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../base64/index.html'><div class='logo-container rust-logo'><img src='../../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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||||
<a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1">1</span>
|
||||
<span id="2">2</span>
|
||||
<span id="3">3</span>
|
||||
<span id="4">4</span>
|
||||
<span id="5">5</span>
|
||||
<span id="6">6</span>
|
||||
</pre><div class="example-wrap"><pre class="rust ">
|
||||
<span class="doccomment">//! Implementations of `io::Read` to transparently decode base64.</span>
|
||||
<span class="kw">mod</span> <span class="ident">decoder</span>;
|
||||
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">decoder</span>::<span class="ident">DecoderReader</span>;
|
||||
|
||||
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
|
||||
<span class="kw">mod</span> <span class="ident">decoder_tests</span>;
|
||||
</pre></div>
|
||||
</section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="base64"></div>
|
||||
<script src="../../../main.js"></script><script src="../../../source-script.js"></script><script src="../../../source-files.js"></script><script defer src="../../../search-index.js"></script></body></html>
|
||||
Reference in New Issue
Block a user