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光驱cdrom读写源代码,scsi命令解析

<a class="l" name="75">     75 </a>	 * they cannot be read.
<a class="l" name="76">     76 </a>	 */</span>
<a class="l" name="77">     77 </a>
<a class="l" name="78">     78 </a>	<b>if</b> (<a href="/source/s?defs=dev">dev</a>-&gt;<a href="/source/s?defs=d_blksize">d_blksize</a> == <span class="n">512</span>) {
<a class="l" name="79">     79 </a>		<a href="/source/s?defs=blksize">blksize</a> = <span class="n">512</span>;
<a class="hl" name="80">     80 </a>		<a href="/source/s?defs=link_blks_count">link_blks_count</a> = <span class="n">8</span>;
<a class="l" name="81">     81 </a>	} <b>else</b> {
<a class="l" name="82">     82 </a>		<a href="/source/s?defs=blksize">blksize</a> = <span class="n">2048</span>;
<a class="l" name="83">     83 </a>		<a href="/source/s?defs=link_blks_count">link_blks_count</a> = <span class="n">2</span>;
<a class="l" name="84">     84 </a>	}
<a class="l" name="85">     85 </a>
<a class="l" name="86">     86 </a>	<a href="/source/s?defs=buf">buf</a> = (<a href="/source/s?defs=uchar_t">uchar_t</a> *)<a href="/source/s?defs=my_zalloc">my_zalloc</a>(<a href="/source/s?defs=READ_BURST">READ_BURST</a> * <a href="/source/s?defs=blksize">blksize</a>);
<a class="l" name="87">     87 </a>
<a class="l" name="88">     88 </a>	<a href="/source/s?defs=print_n_flush">print_n_flush</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Reading track %d..."</span>), <a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_track_no">ti_track_no</a>);
<a class="l" name="89">     89 </a>
<a class="hl" name="90">     90 </a>	<b>if</b> (<a href="/source/s?defs=verbose">verbose</a>)
<a class="l" name="91">     91 </a>		<a href="/source/s?defs=print_n_flush">print_n_flush</a>(<span class="s">"Track size is %u..."</span>, <a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_track_size">ti_track_size</a>);
<a class="l" name="92">     92 </a>
<a class="l" name="93">     93 </a>	<a href="/source/s?defs=init_progress">init_progress</a>();
<a class="l" name="94">     94 </a>	<a href="/source/s?defs=cblk">cblk</a> = <a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_start_address">ti_start_address</a>;
<a class="l" name="95">     95 </a>	<a href="/source/s?defs=blks_read">blks_read</a> = <span class="n">0</span>;
<a class="l" name="96">     96 </a>	<b>while</b> (<a href="/source/s?defs=blks_read">blks_read</a> &lt; <a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_track_size">ti_track_size</a>) {
<a class="l" name="97">     97 </a>		<span class="c">/* Last few are special */</span>
<a class="l" name="98">     98 </a>		<a href="/source/s?defs=read_chunk">read_chunk</a> = <a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_track_size">ti_track_size</a> - <a href="/source/s?defs=blks_read">blks_read</a> - <a href="/source/s?defs=link_blks_count">link_blks_count</a>;
<a class="l" name="99">     99 </a>		<a href="/source/s?defs=read_chunk">read_chunk</a> = (<a href="/source/s?defs=read_chunk">read_chunk</a> &gt; <a href="/source/s?defs=READ_BURST">READ_BURST</a>) ? <a href="/source/s?defs=READ_BURST">READ_BURST</a> :
<a class="hl" name="100">    100 </a>		    <a href="/source/s?defs=read_chunk">read_chunk</a>;
<a class="l" name="101">    101 </a>		<b>if</b> (<a href="/source/s?defs=read_chunk">read_chunk</a> == <span class="n">0</span>) {
<a class="l" name="102">    102 </a>			<span class="c">/* Time for last link blocks */</span>
<a class="l" name="103">    103 </a>			<a href="/source/s?defs=read_chunk">read_chunk</a> = <a href="/source/s?defs=link_blks_count">link_blks_count</a>;
<a class="l" name="104">    104 </a>		}
<a class="l" name="105">    105 </a>		<a href="/source/s?defs=read_size">read_size</a> = <a href="/source/s?defs=read_chunk">read_chunk</a> * <a href="/source/s?defs=blksize">blksize</a>;
<a class="l" name="106">    106 </a>		<b>if</b> (<a href="/source/s?defs=read10">read10</a>(<a href="/source/s?defs=dev">dev</a>-&gt;<a href="/source/s?defs=d_fd">d_fd</a>, <a href="/source/s?defs=cblk">cblk</a>, <a href="/source/s?defs=read_chunk">read_chunk</a>, <a href="/source/s?defs=buf">buf</a>, <a href="/source/s?defs=read_size">read_size</a>)) {
<a class="l" name="107">    107 </a>			<b>if</b> (h-&gt;<a href="/source/s?defs=bstr_write">bstr_write</a>(h, <a href="/source/s?defs=buf">buf</a>, <a href="/source/s?defs=read_size">read_size</a>) != <a href="/source/s?defs=read_size">read_size</a>) {
<a class="l" name="108">    108 </a>				<b>goto</b> <a href="/source/s?defs=read_data_track_failed">read_data_track_failed</a>;
<a class="l" name="109">    109 </a>			}
<a class="hl" name="110">    110 </a>		} <b>else</b> {
<a class="l" name="111">    111 </a>			<b>if</b> (<a href="/source/s?defs=blks_read">blks_read</a> !=
<a class="l" name="112">    112 </a>			    (<a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_track_size">ti_track_size</a> - <a href="/source/s?defs=link_blks_count">link_blks_count</a>)) {
<a class="l" name="113">    113 </a>				<b>goto</b> <a href="/source/s?defs=read_data_track_failed">read_data_track_failed</a>;
<a class="l" name="114">    114 </a>			} <b>else</b> {
<a class="l" name="115">    115 </a>			<span class="c">/* Read can fail for last link sectors */</span>
<a class="l" name="116">    116 </a>				<a href="/source/s?defs=errno">errno</a> = <span class="n">0</span>;
<a class="l" name="117">    117 </a>			}
<a class="l" name="118">    118 </a>		}
<a class="l" name="119">    119 </a>		<a href="/source/s?defs=blks_read">blks_read</a> += <a href="/source/s?defs=read_chunk">read_chunk</a>;
<a class="hl" name="120">    120 </a>		<a href="/source/s?defs=cblk">cblk</a> += <a href="/source/s?defs=read_chunk">read_chunk</a>;
<a class="l" name="121">    121 </a>		(<b>void</b>) <a href="/source/s?defs=progress">progress</a>((<a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_track_size">ti_track_size</a>), <a href="/source/s?defs=blks_read">blks_read</a>);
<a class="l" name="122">    122 </a>	}
<a class="l" name="123">    123 </a>	<span class="c">/* l10n_NOTE : 'done' as in "Reading track 1...done"  */</span>
<a class="l" name="124">    124 </a>	(<b>void</b>) <a href="/source/s?defs=str_print">str_print</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"done.\n"</span>), <a href="/source/s?defs=progress_pos">progress_pos</a>);
<a class="l" name="125">    125 </a>	<a href="/source/s?defs=ret">ret</a> = <span class="n">1</span>;
<a class="l" name="126">    126 </a><a href="/source/s?defs=read_data_track_failed">read_data_track_failed</a>:
<a class="l" name="127">    127 </a>	<a href="/source/s?defs=sav">sav</a> = <a href="/source/s?defs=errno">errno</a>;
<a class="l" name="128">    128 </a>
<a class="l" name="129">    129 </a>	<a href="/source/s?defs=free">free</a>(<a href="/source/s?defs=buf">buf</a>);
<a class="hl" name="130">    130 </a>	<a href="/source/s?defs=errno">errno</a> = <a href="/source/s?defs=sav">sav</a>;
<a class="l" name="131">    131 </a>	<b>return</b> (<a href="/source/s?defs=ret">ret</a>);
<a class="l" name="132">    132 </a>}
<a class="l" name="133">    133 </a>
<a class="l" name="134">    134 </a><b>static</b> <b>void</b>
<a class="l" name="135">    135 </a><a href="/source/s?defs=ensure_media_space">ensure_media_space</a>(<a href="/source/s?defs=uint32_t">uint32_t</a> <a href="/source/s?defs=total_nblks">total_nblks</a>, <a href="/source/s?defs=uchar_t">uchar_t</a> <a href="/source/s?defs=end_tno">end_tno</a>)
<a class="l" name="136">    136 </a>{
<a class="l" name="137">    137 </a>	<a href="/source/s?defs=uint32_t">uint32_t</a> <a href="/source/s?defs=nblks_avail">nblks_avail</a>;
<a class="l" name="138">    138 </a>	<a href="/source/s?defs=uint_t">uint_t</a> <a href="/source/s?defs=bsize">bsize</a>;
<a class="l" name="139">    139 </a>	<a href="/source/s?defs=uint_t">uint_t</a> <a href="/source/s?defs=leadin_size">leadin_size</a> = <span class="n">0</span>;
<a class="hl" name="140">    140 </a>
<a class="l" name="141">    141 </a>	<a href="/source/s?defs=get_media_type">get_media_type</a>(<a href="/source/s?defs=target">target</a>-&gt;<a href="/source/s?defs=d_fd">d_fd</a>);
<a class="l" name="142">    142 </a>
<a class="l" name="143">    143 </a>	<b>if</b> (<a href="/source/s?defs=device_type">device_type</a> == <a href="/source/s?defs=CD_RW">CD_RW</a>) {
<a class="l" name="144">    144 </a>		<a href="/source/s?defs=nblks_avail">nblks_avail</a> = <a href="/source/s?defs=get_last_possible_lba">get_last_possible_lba</a>(<a href="/source/s?defs=target">target</a>);
<a class="l" name="145">    145 </a>
<a class="l" name="146">    146 </a>		<b>if</b> (<a href="/source/s?defs=nblks_avail">nblks_avail</a> == <span class="n">0</span>) {
<a class="l" name="147">    147 </a>
<a class="l" name="148">    148 </a>			<span class="c">/* most newer drives use READ FORMAT CAPACITY */</span>
<a class="l" name="149">    149 </a>			<a href="/source/s?defs=nblks_avail">nblks_avail</a> = <a href="/source/s?defs=read_format_capacity">read_format_capacity</a>(<a href="/source/s?defs=target">target</a>-&gt;<a href="/source/s?defs=d_fd">d_fd</a>,
<a class="hl" name="150">    150 </a>			    &amp;<a href="/source/s?defs=bsize">bsize</a>);
<a class="l" name="151">    151 </a>
<a class="l" name="152">    152 </a>			<span class="c">/* if both methods fail, fall back on defaults */</span>
<a class="l" name="153">    153 </a>			<b>if</b> (<a href="/source/s?defs=nblks_avail">nblks_avail</a> == <span class="n">0</span>) {
<a class="l" name="154">    154 </a>				<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Unable to determine media "</span>
<a class="l" name="155">    155 </a>				    <span class="s">"capacity. Defaulting to 650 MB (74 minute)"</span>
<a class="l" name="156">    156 </a>				    <span class="s">" disc.\n"</span>));
<a class="l" name="157">    157 </a>				<a href="/source/s?defs=nblks_avail">nblks_avail</a> = <a href="/source/s?defs=MAX_CD_BLKS">MAX_CD_BLKS</a>;
<a class="l" name="158">    158 </a>			}
<a class="l" name="159">    159 </a>		<a href="/source/s?defs=leadin_size">leadin_size</a> = <a href="/source/s?defs=end_tno">end_tno</a>*<span class="n">300</span>;
<a class="hl" name="160">    160 </a>		}
<a class="l" name="161">    161 </a>	} <b>else</b> {
<a class="l" name="162">    162 </a>		<span class="c">/*
<a class="l" name="163">    163 </a>		 * For DVD drives use read_format_capacity as default
<a class="l" name="164">    164 </a>		 * retrieve the media size, it can be 3.6, 3.9, 4.2,
<a class="l" name="165">    165 </a>		 * 4.7, or 9.2 GB
<a class="l" name="166">    166 </a>		 */</span>
<a class="l" name="167">    167 </a>		<a href="/source/s?defs=nblks_avail">nblks_avail</a> = <a href="/source/s?defs=read_format_capacity">read_format_capacity</a>(<a href="/source/s?defs=target">target</a>-&gt;<a href="/source/s?defs=d_fd">d_fd</a>, &amp;<a href="/source/s?defs=bsize">bsize</a>);
<a class="l" name="168">    168 </a>
<a class="l" name="169">    169 </a>		<span class="c">/* sanity check. if not reasonable default to 4.7 GB */</span>
<a class="hl" name="170">    170 </a>		<b>if</b> (<a href="/source/s?defs=nblks_avail">nblks_avail</a> &lt; <a href="/source/s?defs=MAX_CD_BLKS">MAX_CD_BLKS</a>) {
<a class="l" name="171">    171 </a>			<a href="/source/s?defs=nblks_avail">nblks_avail</a> = <a href="/source/s?defs=MAX_DVD_BLKS">MAX_DVD_BLKS</a>;
<a class="l" name="172">    172 </a>		}
<a class="l" name="173">    173 </a>	}
<a class="l" name="174">    174 </a>
<a class="l" name="175">    175 </a>	<b>if</b> ((<a href="/source/s?defs=total_nblks">total_nblks</a> + <a href="/source/s?defs=leadin_size">leadin_size</a>) &gt; <a href="/source/s?defs=nblks_avail">nblks_avail</a>) {
<a class="l" name="176">    176 </a>		<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Not enough space on the media.\n"</span>));
<a class="l" name="177">    177 </a>		<b>if</b> (<a href="/source/s?defs=debug">debug</a>) {
<a class="l" name="178">    178 </a>			(<b>void</b>) <a href="/source/s?defs=printf">printf</a>(<span class="s">"Need %u  only found %u \n"</span>,
<a class="l" name="179">    179 </a>			    (<a href="/source/s?defs=total_nblks">total_nblks</a> + <a href="/source/s?defs=leadin_size">leadin_size</a>),
<a class="hl" name="180">    180 </a>			    (<a href="/source/s?defs=uint32_t">uint32_t</a>)<a href="/source/s?defs=nblks_avail">nblks_avail</a>);
<a class="l" name="181">    181 </a>		}
<a class="l" name="182">    182 </a>
<a class="l" name="183">    183 </a>		<a href="/source/s?defs=exit">exit</a>(<span class="n">1</span>);
<a class="l" name="184">    184 </a>	}
<a class="l" name="185">    185 </a>}
<a class="l" name="186">    186 </a>
<a class="l" name="187">    187 </a><span class="c">/*
<a class="l" name="188">    188 </a> * This copies both audio and data CDs. It first reads the TOC of the source CD
<a class="l" name="189">    189 </a> * and creates a temp file with the CD image. After this is completed it creates
<a class="hl" name="190">    190 </a> * the target CD using TAO mode.
<a class="l" name="191">    191 </a> */</span>
<a class="l" name="192">    192 </a><b>void</b>
<a class="l" name="193">    193 </a><a href="/source/s?defs=copy_cd">copy_cd</a>(<b>void</b>)
<a class="l" name="194">    194 </a>{
<a class="l" name="195">    195 </a>	<a href="/source/s?defs=cd_device">cd_device</a> *<a href="/source/s?defs=src">src</a>;
<a class="l" name="196">    196 </a>	<b>char</b> *p;
<a class="l" name="197">    197 </a>	<a href="/source/s?defs=uchar_t">uchar_t</a> *<a href="/source/s?defs=toc">toc</a>, <a href="/source/s?defs=end_tno">end_tno</a>;
<a class="l" name="198">    198 </a>	<b>int</b> <a href="/source/s?defs=blksize">blksize</a>, i;
<a class="l" name="199">    199 </a>	<b>int</b> <a href="/source/s?defs=audio_cd">audio_cd</a>, <a href="/source/s?defs=data_cd">data_cd</a>;
<a class="hl" name="200">    200 </a>	<a href="/source/s?defs=uint32_t">uint32_t</a> <a href="/source/s?defs=total_nblks">total_nblks</a>;
<a class="l" name="201">    201 </a>	<b>int</b> <a href="/source/s?defs=ret">ret</a>;
<a class="l" name="202">    202 </a>	<b>struct</b> <a href="/source/s?defs=t_data">t_data</a> *<a href="/source/s?defs=tlist">tlist</a>;
<a class="l" name="203">    203 </a>
<a class="l" name="204">    204 </a>	<a href="/source/s?defs=print_n_flush">print_n_flush</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Analyzing source CD..."</span>));
<a class="l" name="205">    205 </a>	(<b>void</b>) <a href="/source/s?defs=check_device">check_device</a>(<a href="/source/s?defs=target">target</a>,
<a class="l" name="206">    206 </a>	    <a href="/source/s?defs=CHECK_DEVICE_NOT_WRITABLE">CHECK_DEVICE_NOT_WRITABLE</a>|<a href="/source/s?defs=EXIT_IF_CHECK_FAILED">EXIT_IF_CHECK_FAILED</a>);
<a class="l" name="207">    207 </a>
<a class="l" name="208">    208 </a>	<span class="c">/* if source drive is specified on the command line */</span>
<a class="l" name="209">    209 </a>
<a class="hl" name="210">    210 </a>	<b>if</b> (<a href="/source/s?defs=copy_src">copy_src</a>) {
<a class="l" name="211">    211 </a>		p = <a href="/source/s?defs=my_zalloc">my_zalloc</a>(<a href="/source/s?defs=PATH_MAX">PATH_MAX</a>);
<a class="l" name="212">    212 </a>		<b>if</b> (<a href="/source/s?defs=lookup_device">lookup_device</a>(<a href="/source/s?defs=copy_src">copy_src</a>, p) == <span class="n">0</span>) {
<a class="l" name="213">    213 </a>			<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Cannot find device %s"</span>), <a href="/source/s?defs=copy_src">copy_src</a>);
<a class="l" name="214">    214 </a>			<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">" or no media in the drive\n"</span>));
<a class="l" name="215">    215 </a>			<a href="/source/s?defs=exit">exit</a>(<span class="n">1</span>);
<a class="l" name="216">    216 </a>		}