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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/3125/">https://reviewboard.asterisk.org/r/3125/</a>
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<p style="margin-top: 0;">On January 13th, 2014, 4:24 p.m. CST, <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/3125/diff/1/?file=52887#file52887line797" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/main/http.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int get_content_length(struct ast_variable *headers)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="cm">/* pre-allocate buffer */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="n">buf</span> <span class="o">=</span> <span class="n">ast_malloc</span><span class="p">(</span><span class="n">bufsize</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">buf</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">return</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">}</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You could actually defer allocating buffer here until you know content_length + chunk_length, then allocate the buffer. That would have the benefit of only allocating as much memory as you actually need.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The number of chunks isn't known ahead of time, and in most cases there will be a high quantity of small chunks, thus pre-allocating a reasonably sized buffer will most of the time avoid the cpu cost of reallocating.</pre>
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<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<p style="margin-top: 0;">On January 13th, 2014, 4:24 p.m. CST, <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/3125/diff/1/?file=52887#file52887line804" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/main/http.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int get_content_length(struct ast_variable *headers)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="k">while</span> <span class="p">(</span><span class="mi">1</span><span class="p">)</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="p">{</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You don't need the while(1) here, as you aren't breaking out of the block scope that it provides.</pre>
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<p>On January 13th, 2014, 5:08 p.m. CST, <b>rmudgett</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The curly is in the wrong place per guidelines.
Also I know some static checkers can complain of an always true while loop where they won't if you use for (;;)</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">It's a loop - there are multiple header/chunk sequences (minimum 2) that have to be read.</pre>
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<p style="margin-top: 0;">On January 13th, 2014, 4:24 p.m. CST, <b>Matt Jordan</b> wrote:</p>
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<a href="https://reviewboard.asterisk.org/r/3125/diff/1/?file=52887#file52887line831" style="color: black; font-weight: bold; text-decoration: underline;">/branches/12/main/http.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int get_content_length(struct ast_variable *headers)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="k">if</span> <span class="p">(</span><span class="n">content_length</span> <span class="o">+</span> <span class="n">chunk_length</span> <span class="o">>=</span> <span class="n">bufsize</span><span class="p">)</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="tb"> </span><span class="tb"> </span><span class="tb"> </span><span class="n">bufsize</span> <span class="o">*=</span> <span class="mi">2</span><span class="p">;</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Well, if chunk_length is *really* big, even bufsize *=2 might not be sufficient.
In fact, MAX_POST_CONTENT is 1025, so we should never actually hit this code, since we explicitly disallow a chunk_length + content_length greater than that.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This will allow it to continue to expand the buffer as needed to meet the incoming stream. However, in light of MAX_POST_CONTENT being that small, I should lower the initial allocation.
This algorithm is robust to handle future expansion should we ever need the ability to handle larger content.</pre>
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<p>- Scott</p>
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<p>On January 13th, 2014, 4:09 p.m. CST, Scott Griepentrog wrote:</p>
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<div>Review request for Asterisk Developers and Matt Jordan.</div>
<div>By Scott Griepentrog.</div>
<p style="color: grey;"><i>Updated Jan. 13, 2014, 4:09 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-23068">ASTERISK-23068</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
Asterisk
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Implements support for HTTP chunked mode Transfer-Encoding in JSON and Form (post vars) body content. Relocated code from ast_http_get_json() and ast_http_get_post_vars() that reads content from stream into new function ast_http_get_contents(), and added support for reading and decoding chunked mode transfers.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Testsuite test rest_api/chunked_transfer added (see https://reviewboard.asterisk.org/r/3126/) to insure correct operation of chunked and regular mode.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>/branches/12/main/http.c <span style="color: grey">(405282)</span></li>
<li>/branches/12/include/asterisk/http.h <span style="color: grey">(405282)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/3125/diff/" style="margin-left: 3em;">View Diff</a></p>
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