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 <span id="projectnumber">4.14.2</span>
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<div class="title">String Pool API.<div class="ingroups"><a class="el" href="group__datatypes.html">Data types:</a></div></div> </div>
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<p>How to store strings in pools.
<a href="#details">More...</a></p>
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Collaboration diagram for String Pool API.:</div>
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Files</h2></td></tr>
<tr class="memitem:rpmstrpool_8h"><td class="memItemLeft" align="right" valign="top">file  </td><td class="memItemRight" valign="bottom"><a class="el" href="rpmstrpool_8h.html">rpmstrpool.h</a></td></tr>
<tr class="memdesc:rpmstrpool_8h"><td class="mdescLeft"> </td><td class="mdescRight">String pools manipulation helper functions. <br /></td></tr>
<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gaaeaf6e397a44a1672390718de7093ccc"><td class="memItemLeft" align="right" valign="top"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#gaaeaf6e397a44a1672390718de7093ccc">rpmstrPoolCreate</a> (void)</td></tr>
<tr class="memdesc:gaaeaf6e397a44a1672390718de7093ccc"><td class="mdescLeft"> </td><td class="mdescRight">Create a new, empty string pool. <a href="#gaaeaf6e397a44a1672390718de7093ccc">More...</a><br /></td></tr>
<tr class="separator:gaaeaf6e397a44a1672390718de7093ccc"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga75f228748043c504c8c7c79bd96c092a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#ga75f228748043c504c8c7c79bd96c092a">rpmstrPoolFree</a> (<a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> pool)</td></tr>
<tr class="memdesc:ga75f228748043c504c8c7c79bd96c092a"><td class="mdescLeft"> </td><td class="mdescRight">Free a string pool and its contents. <a href="#ga75f228748043c504c8c7c79bd96c092a">More...</a><br /></td></tr>
<tr class="separator:ga75f228748043c504c8c7c79bd96c092a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gacd81f4ddd01801fba5effa4f7aabf3e1"><td class="memItemLeft" align="right" valign="top"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#gacd81f4ddd01801fba5effa4f7aabf3e1">rpmstrPoolLink</a> (<a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> pool)</td></tr>
<tr class="memdesc:gacd81f4ddd01801fba5effa4f7aabf3e1"><td class="mdescLeft"> </td><td class="mdescRight">Reference a string pool. <a href="#gacd81f4ddd01801fba5effa4f7aabf3e1">More...</a><br /></td></tr>
<tr class="separator:gacd81f4ddd01801fba5effa4f7aabf3e1"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaa2514a67e3b9cf7fa67f7192f3d1cb35"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#gaa2514a67e3b9cf7fa67f7192f3d1cb35">rpmstrPoolFreeze</a> (<a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> pool, int keephash)</td></tr>
<tr class="memdesc:gaa2514a67e3b9cf7fa67f7192f3d1cb35"><td class="mdescLeft"> </td><td class="mdescRight">Freeze a string pool: new strings cannot be added to a frozen pool. <a href="#gaa2514a67e3b9cf7fa67f7192f3d1cb35">More...</a><br /></td></tr>
<tr class="separator:gaa2514a67e3b9cf7fa67f7192f3d1cb35"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga6c80f57f01682a79db4b55519e3d65b3"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#ga6c80f57f01682a79db4b55519e3d65b3">rpmstrPoolUnfreeze</a> (<a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> pool)</td></tr>
<tr class="memdesc:ga6c80f57f01682a79db4b55519e3d65b3"><td class="mdescLeft"> </td><td class="mdescRight">Unfreeze a string pool to allow new additions again. <a href="#ga6c80f57f01682a79db4b55519e3d65b3">More...</a><br /></td></tr>
<tr class="separator:ga6c80f57f01682a79db4b55519e3d65b3"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga9278a93023fc23e71b3228482c42fd5c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#ga9278a93023fc23e71b3228482c42fd5c">rpmstrPoolId</a> (<a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> pool, const char *s, int create)</td></tr>
<tr class="memdesc:ga9278a93023fc23e71b3228482c42fd5c"><td class="mdescLeft"> </td><td class="mdescRight">Look up the id of a string. <a href="#ga9278a93023fc23e71b3228482c42fd5c">More...</a><br /></td></tr>
<tr class="separator:ga9278a93023fc23e71b3228482c42fd5c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga92ef8912ef86d065208f24e196385c2b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#ga92ef8912ef86d065208f24e196385c2b">rpmstrPoolIdn</a> (<a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> pool, const char *s, size_t slen, int create)</td></tr>
<tr class="memdesc:ga92ef8912ef86d065208f24e196385c2b"><td class="mdescLeft"> </td><td class="mdescRight">Look up the id of a string with predetermined length. <a href="#ga92ef8912ef86d065208f24e196385c2b">More...</a><br /></td></tr>
<tr class="separator:ga92ef8912ef86d065208f24e196385c2b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gab66051b97032af5af6e6b6f0551b77ec"><td class="memItemLeft" align="right" valign="top">const char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#gab66051b97032af5af6e6b6f0551b77ec">rpmstrPoolStr</a> (<a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> pool, <a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> sid)</td></tr>
<tr class="memdesc:gab66051b97032af5af6e6b6f0551b77ec"><td class="mdescLeft"> </td><td class="mdescRight">Look up a string by its pool id. <a href="#gab66051b97032af5af6e6b6f0551b77ec">More...</a><br /></td></tr>
<tr class="separator:gab66051b97032af5af6e6b6f0551b77ec"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gafd879b64060d3f8bb1a092f0d40f689e"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#gafd879b64060d3f8bb1a092f0d40f689e">rpmstrPoolStrlen</a> (<a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> pool, <a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> sid)</td></tr>
<tr class="memdesc:gafd879b64060d3f8bb1a092f0d40f689e"><td class="mdescLeft"> </td><td class="mdescRight">Return length of a string by its pool id. <a href="#gafd879b64060d3f8bb1a092f0d40f689e">More...</a><br /></td></tr>
<tr class="separator:gafd879b64060d3f8bb1a092f0d40f689e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga59a73d80c0b5deaa76fdb8e4af4b06cb"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#ga59a73d80c0b5deaa76fdb8e4af4b06cb">rpmstrPoolStreq</a> (<a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> poolA, <a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> sidA, <a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> poolB, <a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> sidB)</td></tr>
<tr class="memdesc:ga59a73d80c0b5deaa76fdb8e4af4b06cb"><td class="mdescLeft"> </td><td class="mdescRight">Compare two strings for equality by their ids. <a href="#ga59a73d80c0b5deaa76fdb8e4af4b06cb">More...</a><br /></td></tr>
<tr class="separator:ga59a73d80c0b5deaa76fdb8e4af4b06cb"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga03b9d8578a493252ab545c8bd35cbf90"><td class="memItemLeft" align="right" valign="top"><a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__rpmstrpool.html#ga03b9d8578a493252ab545c8bd35cbf90">rpmstrPoolNumStr</a> (<a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> pool)</td></tr>
<tr class="memdesc:ga03b9d8578a493252ab545c8bd35cbf90"><td class="mdescLeft"> </td><td class="mdescRight">Return the number of strings stored in the pool. <a href="#ga03b9d8578a493252ab545c8bd35cbf90">More...</a><br /></td></tr>
<tr class="separator:ga03b9d8578a493252ab545c8bd35cbf90"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>How to store strings in pools. </p>
<h2 class="groupheader">Function Documentation</h2>
<a id="gaaeaf6e397a44a1672390718de7093ccc"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaaeaf6e397a44a1672390718de7093ccc">◆ </a></span>rpmstrPoolCreate()</h2>
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<td class="memname"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> rpmstrPoolCreate </td>
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<p>Create a new, empty string pool. </p>
<dl class="section return"><dt>Returns</dt><dd>new string pool </dd></dl>
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</div>
<a id="ga75f228748043c504c8c7c79bd96c092a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga75f228748043c504c8c7c79bd96c092a">◆ </a></span>rpmstrPoolFree()</h2>
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<td class="memname"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> rpmstrPoolFree </td>
<td>(</td>
<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td>
<td class="paramname"><em>pool</em></td><td>)</td>
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<p>Free a string pool and its contents. </p>
<p>While other references exist, this only decrements the reference count. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pool</td><td>string pool </td></tr>
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</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>NULL always </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaa2514a67e3b9cf7fa67f7192f3d1cb35">◆ </a></span>rpmstrPoolFreeze()</h2>
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<td class="memname">void rpmstrPoolFreeze </td>
<td>(</td>
<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td>
<td class="paramname"><em>pool</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">int </td>
<td class="paramname"><em>keephash</em> </td>
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<p>Freeze a string pool: new strings cannot be added to a frozen pool. </p>
<p>If keephash is 0, memory usage is minimized but string -> id lookups are no longer possible and unfreezing is an expensive operation. Id -> string lookups are always possible on a frozen pool too. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pool</td><td>string pool </td></tr>
<tr><td class="paramname">keephash</td><td>should string -> id hash be kept around? </td></tr>
</table>
</dd>
</dl>
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<a id="ga9278a93023fc23e71b3228482c42fd5c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga9278a93023fc23e71b3228482c42fd5c">◆ </a></span>rpmstrPoolId()</h2>
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<td class="memname"><a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> rpmstrPoolId </td>
<td>(</td>
<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td>
<td class="paramname"><em>pool</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">const char * </td>
<td class="paramname"><em>s</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>create</em> </td>
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<td>)</td>
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<p>Look up the id of a string. </p>
<p>If create is specified the string is added to the pool if it does not already exist. Creation can only fail if the pool is in frozen state. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pool</td><td>string pool </td></tr>
<tr><td class="paramname">s</td><td>\0-terminated string to look up </td></tr>
<tr><td class="paramname">create</td><td>should an id be created if not already present? </td></tr>
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</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>id of the string or 0 for not found </dd></dl>
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<a id="ga92ef8912ef86d065208f24e196385c2b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga92ef8912ef86d065208f24e196385c2b">◆ </a></span>rpmstrPoolIdn()</h2>
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<td class="memname"><a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> rpmstrPoolIdn </td>
<td>(</td>
<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td>
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<td class="paramname"><em>s</em>, </td>
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<td class="paramname"><em>slen</em>, </td>
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<td class="paramtype">int </td>
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<p>Look up the id of a string with predetermined length. </p>
<p>The string does not have to be \0-terminated. If create is specified the string is added to the pool if it does not already exist. Creation can only fail if the pool is in frozen state. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pool</td><td>string pool </td></tr>
<tr><td class="paramname">s</td><td>string to look up </td></tr>
<tr><td class="paramname">slen</td><td>number of characters from s to consider </td></tr>
<tr><td class="paramname">create</td><td>should an id be created if not already present? </td></tr>
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</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>id of the string or 0 for not found </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gacd81f4ddd01801fba5effa4f7aabf3e1">◆ </a></span>rpmstrPoolLink()</h2>
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<td class="memname"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> rpmstrPoolLink </td>
<td>(</td>
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<p>Reference a string pool. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pool</td><td>string pool </td></tr>
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</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>new string pool reference </dd></dl>
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<a id="ga03b9d8578a493252ab545c8bd35cbf90"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga03b9d8578a493252ab545c8bd35cbf90">◆ </a></span>rpmstrPoolNumStr()</h2>
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<td class="memname"><a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> rpmstrPoolNumStr </td>
<td>(</td>
<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td>
<td class="paramname"><em>pool</em></td><td>)</td>
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<p>Return the number of strings stored in the pool. </p>
<p>This number is also the highest legal id for the pool. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pool</td><td>string pool </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>number of strings in the pool </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gab66051b97032af5af6e6b6f0551b77ec">◆ </a></span>rpmstrPoolStr()</h2>
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<td class="memname">const char* rpmstrPoolStr </td>
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<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td>
<td class="paramname"><em>pool</em>, </td>
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<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> </td>
<td class="paramname"><em>sid</em> </td>
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<p>Look up a string by its pool id. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pool</td><td>string pool </td></tr>
<tr><td class="paramname">sid</td><td>pool id of a string </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>pointer to the string or NULL for invalid id </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga59a73d80c0b5deaa76fdb8e4af4b06cb">◆ </a></span>rpmstrPoolStreq()</h2>
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<td class="memname">int rpmstrPoolStreq </td>
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<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td>
<td class="paramname"><em>poolA</em>, </td>
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<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> </td>
<td class="paramname"><em>sidA</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td>
<td class="paramname"><em>poolB</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> </td>
<td class="paramname"><em>sidB</em> </td>
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<p>Compare two strings for equality by their ids. </p>
<p>The result is equal to calling <a class="el" href="rpmstring_8h.html#a1e5f8ebc49cc189053eb455e500d7e00" title="Test for string equality. ">rstreq()</a> on two strings retrieved through <a class="el" href="group__rpmstrpool.html#gab66051b97032af5af6e6b6f0551b77ec" title="Look up a string by its pool id. ">rpmstrPoolStr()</a> but when the id's are within the same pool, this runs in constant time. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">poolA</td><td>string pool of the first string </td></tr>
<tr><td class="paramname">sidA</td><td>pool id of the first string </td></tr>
<tr><td class="paramname">poolB</td><td>string pool of the second string </td></tr>
<tr><td class="paramname">sidB</td><td>pool id of the second string </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>1 if strings are equal, 0 otherwise </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gafd879b64060d3f8bb1a092f0d40f689e">◆ </a></span>rpmstrPoolStrlen()</h2>
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<td class="memname">size_t rpmstrPoolStrlen </td>
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<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td>
<td class="paramname"><em>pool</em>, </td>
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<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a16763b1c90e11e1e0cb4e6f578e286f7">rpmsid</a> </td>
<td class="paramname"><em>sid</em> </td>
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<p>Return length of a string by its pool id. </p>
<p>The result is equal to calling strlen() on a string retrieved through <a class="el" href="group__rpmstrpool.html#gab66051b97032af5af6e6b6f0551b77ec" title="Look up a string by its pool id. ">rpmstrPoolStr()</a>, but the pool might be able to optimize the calculation. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pool</td><td>string pool </td></tr>
<tr><td class="paramname">sid</td><td>pool id of a string </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>length of the string, 0 for invalid pool or id </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga6c80f57f01682a79db4b55519e3d65b3">◆ </a></span>rpmstrPoolUnfreeze()</h2>
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<td class="memname">void rpmstrPoolUnfreeze </td>
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<td class="paramtype"><a class="el" href="rpmtypes_8h.html#a947b759787d5420aec3c860be11bc0f3">rpmstrPool</a> </td>
<td class="paramname"><em>pool</em></td><td>)</td>
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<p>Unfreeze a string pool to allow new additions again. </p>
<p>If keephash was not specified on freezing, this requires rehashing the entire pool contents. </p><dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pool</td><td>string pool </td></tr>
</table>
</dd>
</dl>
</div>
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