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| <a href="#glib-Data-Checksums.synopsis" class="shortcut">Top</a> |
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| <a href="#glib-Data-Checksums.description" class="shortcut">Description</a> |
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| <div class="refentry" title="Data Checksums"> |
| <a name="glib-Data-Checksums"></a><div class="titlepage"></div> |
| <div class="refnamediv"><table width="100%"><tr> |
| <td valign="top"> |
| <h2><span class="refentrytitle"><a name="glib-Data-Checksums.top_of_page"></a>Data Checksums</span></h2> |
| <p>Data Checksums — Computes the checksum for data</p> |
| </td> |
| <td valign="top" align="right"></td> |
| </tr></table></div> |
| <div class="refsynopsisdiv" title="Synopsis"> |
| <a name="glib-Data-Checksums.synopsis"></a><h2>Synopsis</h2> |
| <pre class="synopsis"> |
| #include <glib.h> |
| |
| enum <a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType">GChecksumType</a>; |
| <a class="link" href="glib-Basic-Types.html#gssize" title="gssize"><span class="returnvalue">gssize</span></a> <a class="link" href="glib-Data-Checksums.html#g-checksum-type-get-length" title="g_checksum_type_get_length ()">g_checksum_type_get_length</a> (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> checksum_type</code></em>); |
| <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum">GChecksum</a>; |
| <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="returnvalue">GChecksum</span></a> * <a class="link" href="glib-Data-Checksums.html#g-checksum-new" title="g_checksum_new ()">g_checksum_new</a> (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> checksum_type</code></em>); |
| <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="returnvalue">GChecksum</span></a> * <a class="link" href="glib-Data-Checksums.html#g-checksum-copy" title="g_checksum_copy ()">g_checksum_copy</a> (<em class="parameter"><code>const <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>); |
| <span class="returnvalue">void</span> <a class="link" href="glib-Data-Checksums.html#g-checksum-free" title="g_checksum_free ()">g_checksum_free</a> (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>); |
| <span class="returnvalue">void</span> <a class="link" href="glib-Data-Checksums.html#g-checksum-reset" title="g_checksum_reset ()">g_checksum_reset</a> (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>); |
| <span class="returnvalue">void</span> <a class="link" href="glib-Data-Checksums.html#g-checksum-update" title="g_checksum_update ()">g_checksum_update</a> (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>, |
| <em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#guchar" title="guchar"><span class="type">guchar</span></a> *data</code></em>, |
| <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gssize" title="gssize"><span class="type">gssize</span></a> length</code></em>); |
| const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="glib-Data-Checksums.html#g-checksum-get-string" title="g_checksum_get_string ()">g_checksum_get_string</a> (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>); |
| <span class="returnvalue">void</span> <a class="link" href="glib-Data-Checksums.html#g-checksum-get-digest" title="g_checksum_get_digest ()">g_checksum_get_digest</a> (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>, |
| <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint8" title="guint8"><span class="type">guint8</span></a> *buffer</code></em>, |
| <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *digest_len</code></em>); |
| |
| <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="glib-Data-Checksums.html#g-compute-checksum-for-data" title="g_compute_checksum_for_data ()">g_compute_checksum_for_data</a> (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> checksum_type</code></em>, |
| <em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#guchar" title="guchar"><span class="type">guchar</span></a> *data</code></em>, |
| <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> length</code></em>); |
| <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="glib-Data-Checksums.html#g-compute-checksum-for-string" title="g_compute_checksum_for_string ()">g_compute_checksum_for_string</a> (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> checksum_type</code></em>, |
| <em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *str</code></em>, |
| <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gssize" title="gssize"><span class="type">gssize</span></a> length</code></em>); |
| </pre> |
| </div> |
| <div class="refsect1" title="Description"> |
| <a name="glib-Data-Checksums.description"></a><h2>Description</h2> |
| <p> |
| GLib provides a generic API for computing checksums (or "digests") |
| for a sequence of arbitrary bytes, using various hashing algorithms |
| like MD5, SHA-1 and SHA-256. Checksums are commonly used in various |
| environments and specifications. |
| </p> |
| <p> |
| GLib supports incremental checksums using the GChecksum data |
| structure, by calling <a class="link" href="glib-Data-Checksums.html#g-checksum-update" title="g_checksum_update ()"><code class="function">g_checksum_update()</code></a> as long as there's data |
| available and then using <a class="link" href="glib-Data-Checksums.html#g-checksum-get-string" title="g_checksum_get_string ()"><code class="function">g_checksum_get_string()</code></a> or |
| <a class="link" href="glib-Data-Checksums.html#g-checksum-get-digest" title="g_checksum_get_digest ()"><code class="function">g_checksum_get_digest()</code></a> to compute the checksum and return it either |
| as a string in hexadecimal form, or as a raw sequence of bytes. To |
| compute the checksum for binary blobs and NUL-terminated strings in |
| one go, use the convenience functions <a class="link" href="glib-Data-Checksums.html#g-compute-checksum-for-data" title="g_compute_checksum_for_data ()"><code class="function">g_compute_checksum_for_data()</code></a> |
| and <a class="link" href="glib-Data-Checksums.html#g-compute-checksum-for-string" title="g_compute_checksum_for_string ()"><code class="function">g_compute_checksum_for_string()</code></a>, respectively. |
| </p> |
| <p> |
| Support for checksums has been added in GLib 2.16 |
| </p> |
| </div> |
| <div class="refsect1" title="Details"> |
| <a name="glib-Data-Checksums.details"></a><h2>Details</h2> |
| <div class="refsect2" title="enum GChecksumType"> |
| <a name="GChecksumType"></a><h3>enum GChecksumType</h3> |
| <pre class="programlisting">typedef enum { |
| G_CHECKSUM_MD5, |
| G_CHECKSUM_SHA1, |
| G_CHECKSUM_SHA256 |
| } GChecksumType; |
| </pre> |
| <p> |
| The hashing algorithm to be used by <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> when performing the |
| digest of some data. |
| </p> |
| <p> |
| Note that the <a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> enumeration may be extended at a later |
| date to include new hashing algorithm types. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><a name="G-CHECKSUM-MD5:CAPS"></a><span class="term"><code class="literal">G_CHECKSUM_MD5</code></span></p></td> |
| <td>Use the MD5 hashing algorithm |
| </td> |
| </tr> |
| <tr> |
| <td><p><a name="G-CHECKSUM-SHA1:CAPS"></a><span class="term"><code class="literal">G_CHECKSUM_SHA1</code></span></p></td> |
| <td>Use the SHA-1 hashing algorithm |
| </td> |
| </tr> |
| <tr> |
| <td><p><a name="G-CHECKSUM-SHA256:CAPS"></a><span class="term"><code class="literal">G_CHECKSUM_SHA256</code></span></p></td> |
| <td>Use the SHA-256 hashing algorithm |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p class="since">Since 2.16</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="g_checksum_type_get_length ()"> |
| <a name="g-checksum-type-get-length"></a><h3>g_checksum_type_get_length ()</h3> |
| <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gssize" title="gssize"><span class="returnvalue">gssize</span></a> g_checksum_type_get_length (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> checksum_type</code></em>);</pre> |
| <p> |
| Gets the length in bytes of digests of type <em class="parameter"><code>checksum_type</code></em> |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>checksum_type</code></em> :</span></p></td> |
| <td>a <a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> the checksum length, or -1 if <em class="parameter"><code>checksum_type</code></em> is |
| not supported. |
| |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p class="since">Since 2.16</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="GChecksum"> |
| <a name="GChecksum"></a><h3>GChecksum</h3> |
| <pre class="programlisting">typedef struct _GChecksum GChecksum;</pre> |
| <p> |
| An opaque structure representing a checksumming operation. |
| To create a new GChecksum, use <a class="link" href="glib-Data-Checksums.html#g-checksum-new" title="g_checksum_new ()"><code class="function">g_checksum_new()</code></a>. To free |
| a GChecksum, use <a class="link" href="glib-Data-Checksums.html#g-checksum-free" title="g_checksum_free ()"><code class="function">g_checksum_free()</code></a>. |
| </p> |
| <p class="since">Since 2.16</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="g_checksum_new ()"> |
| <a name="g-checksum-new"></a><h3>g_checksum_new ()</h3> |
| <pre class="programlisting"><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="returnvalue">GChecksum</span></a> * g_checksum_new (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> checksum_type</code></em>);</pre> |
| <p> |
| Creates a new <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a>, using the checksum algorithm <em class="parameter"><code>checksum_type</code></em>. |
| If the <em class="parameter"><code>checksum_type</code></em> is not known, <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a> is returned. |
| A <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> can be used to compute the checksum, or digest, of an |
| arbitrary binary blob, using different hashing algorithms. |
| </p> |
| <p> |
| A <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> works by feeding a binary blob through <a class="link" href="glib-Data-Checksums.html#g-checksum-update" title="g_checksum_update ()"><code class="function">g_checksum_update()</code></a> |
| until there is data to be checked; the digest can then be extracted |
| using <a class="link" href="glib-Data-Checksums.html#g-checksum-get-string" title="g_checksum_get_string ()"><code class="function">g_checksum_get_string()</code></a>, which will return the checksum as a |
| hexadecimal string; or <a class="link" href="glib-Data-Checksums.html#g-checksum-get-digest" title="g_checksum_get_digest ()"><code class="function">g_checksum_get_digest()</code></a>, which will return a |
| vector of raw bytes. Once either <a class="link" href="glib-Data-Checksums.html#g-checksum-get-string" title="g_checksum_get_string ()"><code class="function">g_checksum_get_string()</code></a> or |
| <a class="link" href="glib-Data-Checksums.html#g-checksum-get-digest" title="g_checksum_get_digest ()"><code class="function">g_checksum_get_digest()</code></a> have been called on a <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a>, the checksum |
| will be closed and it won't be possible to call <a class="link" href="glib-Data-Checksums.html#g-checksum-update" title="g_checksum_update ()"><code class="function">g_checksum_update()</code></a> |
| on it anymore. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>checksum_type</code></em> :</span></p></td> |
| <td>the desired type of checksum |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> the newly created <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a>, or <a class="link" href="glib-Standard-Macros.html#NULL:CAPS" title="NULL"><code class="literal">NULL</code></a>. |
| Use <a class="link" href="glib-Data-Checksums.html#g-checksum-free" title="g_checksum_free ()"><code class="function">g_checksum_free()</code></a> to free the memory allocated by it. |
| |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p class="since">Since 2.16</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="g_checksum_copy ()"> |
| <a name="g-checksum-copy"></a><h3>g_checksum_copy ()</h3> |
| <pre class="programlisting"><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="returnvalue">GChecksum</span></a> * g_checksum_copy (<em class="parameter"><code>const <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>);</pre> |
| <p> |
| Copies a <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a>. If <em class="parameter"><code>checksum</code></em> has been closed, by calling |
| <a class="link" href="glib-Data-Checksums.html#g-checksum-get-string" title="g_checksum_get_string ()"><code class="function">g_checksum_get_string()</code></a> or <a class="link" href="glib-Data-Checksums.html#g-checksum-get-digest" title="g_checksum_get_digest ()"><code class="function">g_checksum_get_digest()</code></a>, the copied |
| checksum will be closed as well. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>checksum</code></em> :</span></p></td> |
| <td>the <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> to copy |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> the copy of the passed <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a>. Use <a class="link" href="glib-Data-Checksums.html#g-checksum-free" title="g_checksum_free ()"><code class="function">g_checksum_free()</code></a> |
| when finished using it. |
| |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p class="since">Since 2.16</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="g_checksum_free ()"> |
| <a name="g-checksum-free"></a><h3>g_checksum_free ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> g_checksum_free (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>);</pre> |
| <p> |
| Frees the memory allocated for <em class="parameter"><code>checksum</code></em>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody><tr> |
| <td><p><span class="term"><em class="parameter"><code>checksum</code></em> :</span></p></td> |
| <td>a <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <p class="since">Since 2.16</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="g_checksum_reset ()"> |
| <a name="g-checksum-reset"></a><h3>g_checksum_reset ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> g_checksum_reset (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>);</pre> |
| <p> |
| Resets the state of the <em class="parameter"><code>checksum</code></em> back to its initial state. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody><tr> |
| <td><p><span class="term"><em class="parameter"><code>checksum</code></em> :</span></p></td> |
| <td>the <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> to reset |
| </td> |
| </tr></tbody> |
| </table></div> |
| <p class="since">Since 2.18</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="g_checksum_update ()"> |
| <a name="g-checksum-update"></a><h3>g_checksum_update ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> g_checksum_update (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>, |
| <em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#guchar" title="guchar"><span class="type">guchar</span></a> *data</code></em>, |
| <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gssize" title="gssize"><span class="type">gssize</span></a> length</code></em>);</pre> |
| <p> |
| Feeds <em class="parameter"><code>data</code></em> into an existing <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a>. The checksum must still be |
| open, that is <a class="link" href="glib-Data-Checksums.html#g-checksum-get-string" title="g_checksum_get_string ()"><code class="function">g_checksum_get_string()</code></a> or <a class="link" href="glib-Data-Checksums.html#g-checksum-get-digest" title="g_checksum_get_digest ()"><code class="function">g_checksum_get_digest()</code></a> must |
| not have been called on <em class="parameter"><code>checksum</code></em>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>checksum</code></em> :</span></p></td> |
| <td>a <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td> |
| <td>buffer used to compute the checksum |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td> |
| <td>size of the buffer, or -1 if it is a null-terminated string. |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p class="since">Since 2.16</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="g_checksum_get_string ()"> |
| <a name="g-checksum-get-string"></a><h3>g_checksum_get_string ()</h3> |
| <pre class="programlisting">const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_checksum_get_string (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>);</pre> |
| <p> |
| Gets the digest as an hexadecimal string. |
| </p> |
| <p> |
| Once this function has been called the <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> can no longer be |
| updated with <a class="link" href="glib-Data-Checksums.html#g-checksum-update" title="g_checksum_update ()"><code class="function">g_checksum_update()</code></a>. |
| </p> |
| <p> |
| The hexadecimal characters will be lower case. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>checksum</code></em> :</span></p></td> |
| <td>a <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> the hexadecimal representation of the checksum. The |
| returned string is owned by the checksum and should not be modified |
| or freed. |
| |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p class="since">Since 2.16</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="g_checksum_get_digest ()"> |
| <a name="g-checksum-get-digest"></a><h3>g_checksum_get_digest ()</h3> |
| <pre class="programlisting"><span class="returnvalue">void</span> g_checksum_get_digest (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> *checksum</code></em>, |
| <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#guint8" title="guint8"><span class="type">guint8</span></a> *buffer</code></em>, |
| <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> *digest_len</code></em>);</pre> |
| <p> |
| Gets the digest from <em class="parameter"><code>checksum</code></em> as a raw binary vector and places it |
| into <em class="parameter"><code>buffer</code></em>. The size of the digest depends on the type of checksum. |
| </p> |
| <p> |
| Once this function has been called, the <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> is closed and can |
| no longer be updated with <a class="link" href="glib-Data-Checksums.html#g-checksum-update" title="g_checksum_update ()"><code class="function">g_checksum_update()</code></a>. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>checksum</code></em> :</span></p></td> |
| <td>a <a class="link" href="glib-Data-Checksums.html#GChecksum" title="GChecksum"><span class="type">GChecksum</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td> |
| <td>output buffer |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>digest_len</code></em> :</span></p></td> |
| <td>an inout parameter. The caller initializes it to the size of <em class="parameter"><code>buffer</code></em>. |
| After the call it contains the length of the digest. |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p class="since">Since 2.16</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="g_compute_checksum_for_data ()"> |
| <a name="g-compute-checksum-for-data"></a><h3>g_compute_checksum_for_data ()</h3> |
| <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_compute_checksum_for_data (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> checksum_type</code></em>, |
| <em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#guchar" title="guchar"><span class="type">guchar</span></a> *data</code></em>, |
| <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> length</code></em>);</pre> |
| <p> |
| Computes the checksum for a binary <em class="parameter"><code>data</code></em> of <em class="parameter"><code>length</code></em>. This is a |
| convenience wrapper for <a class="link" href="glib-Data-Checksums.html#g-checksum-new" title="g_checksum_new ()"><code class="function">g_checksum_new()</code></a>, <a class="link" href="glib-Data-Checksums.html#g-checksum-get-string" title="g_checksum_get_string ()"><code class="function">g_checksum_get_string()</code></a> |
| and <a class="link" href="glib-Data-Checksums.html#g-checksum-free" title="g_checksum_free ()"><code class="function">g_checksum_free()</code></a>. |
| </p> |
| <p> |
| The hexadecimal string returned will be in lower case. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>checksum_type</code></em> :</span></p></td> |
| <td>a <a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td> |
| <td>binary blob to compute the digest of |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td> |
| <td>length of <em class="parameter"><code>data</code></em> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> the digest of the binary data as a string in hexadecimal. |
| The returned string should be freed with <a class="link" href="glib-Memory-Allocation.html#g-free" title="g_free ()"><code class="function">g_free()</code></a> when done using it. |
| |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p class="since">Since 2.16</p> |
| </div> |
| <hr> |
| <div class="refsect2" title="g_compute_checksum_for_string ()"> |
| <a name="g-compute-checksum-for-string"></a><h3>g_compute_checksum_for_string ()</h3> |
| <pre class="programlisting"><a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="returnvalue">gchar</span></a> * g_compute_checksum_for_string (<em class="parameter"><code><a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> checksum_type</code></em>, |
| <em class="parameter"><code>const <a class="link" href="glib-Basic-Types.html#gchar" title="gchar"><span class="type">gchar</span></a> *str</code></em>, |
| <em class="parameter"><code><a class="link" href="glib-Basic-Types.html#gssize" title="gssize"><span class="type">gssize</span></a> length</code></em>);</pre> |
| <p> |
| Computes the checksum of a string. |
| </p> |
| <p> |
| The hexadecimal string returned will be in lower case. |
| </p> |
| <div class="variablelist"><table border="0"> |
| <col align="left" valign="top"> |
| <tbody> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>checksum_type</code></em> :</span></p></td> |
| <td>a <a class="link" href="glib-Data-Checksums.html#GChecksumType" title="enum GChecksumType"><span class="type">GChecksumType</span></a> |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>str</code></em> :</span></p></td> |
| <td>the string to compute the checksum of |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><em class="parameter"><code>length</code></em> :</span></p></td> |
| <td>the length of the string, or -1 if the string is null-terminated. |
| </td> |
| </tr> |
| <tr> |
| <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td> |
| <td> the checksum as a hexadecimal string. The returned string |
| should be freed with <a class="link" href="glib-Memory-Allocation.html#g-free" title="g_free ()"><code class="function">g_free()</code></a> when done using it. |
| |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p class="since">Since 2.16</p> |
| </div> |
| </div> |
| </div> |
| <div class="footer"> |
| <hr> |
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