Sophie: libsword1-devel-1.5.5-2mdk ppc

libsword1-devel-1.5.5-2mdk.ppc.rpm

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<hr><h1>entriesblk.cpp</h1><div class="fragment"><pre>00001 <font class="preprocessor">#include &lt;entriesblk.h&gt;</font>
00002 <font class="preprocessor">#include &lt;stdlib.h&gt;</font>
00003 <font class="preprocessor">#include &lt;string.h&gt;</font>
00004 
00005 <font class="keyword">const</font> <font class="keywordtype">int</font> EntriesBlock::METAHEADERSIZE = 4;
00006         <font class="comment">// count(4);</font>
00007 <font class="keyword">const</font> <font class="keywordtype">int</font> EntriesBlock::METAENTRYSIZE = 8;
00008         <font class="comment">// offset(4); size(4);</font>
00009 
00010 EntriesBlock::EntriesBlock(<font class="keyword">const</font> <font class="keywordtype">char</font> *iBlock, <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> size) {
00011         block = (<font class="keywordtype">char</font> *)calloc(1, size);
00012         memcpy(block, iBlock, size);
00013 }
00014 
00015 
00016 EntriesBlock::EntriesBlock() {
00017         block = (<font class="keywordtype">char</font> *)calloc(1, <font class="keyword">sizeof</font>(__u32));
00018 }
00019 
00020 
00021 EntriesBlock::~EntriesBlock() {
00022         free(block);
00023 }
00024 
00025 
00026 <font class="keywordtype">void</font> EntriesBlock::setCount(<font class="keywordtype">int</font> count) {
00027         __u32 rawCount = archtosword32(count);
00028         memcpy(block, &amp;rawCount, <font class="keyword">sizeof</font>(__u32));
00029 }
00030 
00031 
00032 <font class="keywordtype">int</font> EntriesBlock::getCount() {
00033         __u32 count = 0;
00034         memcpy(&amp;count, block, <font class="keyword">sizeof</font>(__u32));
00035         count = swordtoarch32(count);
00036         <font class="keywordflow">return</font> count;
00037 }
00038 
00039 
00040 <font class="keywordtype">void</font> EntriesBlock::getMetaEntry(<font class="keywordtype">int</font> index, <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> *offset, <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> *size) {
00041         __u32 rawOffset = 0;
00042         __u32 rawSize = 0;
00043         *offset = 0;
00044         *size = 0;
00045         <font class="keywordflow">if</font> (index &gt;= getCount())        <font class="comment">// assert index &lt; count</font>
00046                 <font class="keywordflow">return</font>;
00047 
00048         <font class="comment">// first 4 bytes is count, each 6 bytes after is each meta entry</font>
00049         memcpy(&amp;rawOffset, block + METAHEADERSIZE + (index * METAENTRYSIZE), <font class="keyword">sizeof</font>(rawOffset));
00050         memcpy(&amp;rawSize, block + METAHEADERSIZE + (index * METAENTRYSIZE) + <font class="keyword">sizeof</font>(rawOffset), <font class="keyword">sizeof</font>(rawSize));
00051 
00052         *offset = (<font class="keywordtype">unsigned</font> <font class="keywordtype">long</font>)swordtoarch32(rawOffset);
00053         *size   = (<font class="keywordtype">unsigned</font> <font class="keywordtype">long</font>)swordtoarch32(rawSize);
00054 }
00055 
00056 
00057 <font class="keywordtype">void</font> EntriesBlock::setMetaEntry(<font class="keywordtype">int</font> index, <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> offset, <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> size) {
00058         __u32 rawOffset = archtosword32(offset);
00059         __u32 rawSize = archtosword32(size);
00060 
00061         <font class="keywordflow">if</font> (index &gt;= getCount())        <font class="comment">// assert index &lt; count</font>
00062                 <font class="keywordflow">return</font>;
00063 
00064         <font class="comment">// first 4 bytes is count, each 6 bytes after is each meta entry</font>
00065         memcpy(block + METAHEADERSIZE + (index * METAENTRYSIZE), &amp;rawOffset, <font class="keyword">sizeof</font>(rawOffset));
00066         memcpy(block + METAHEADERSIZE + (index * METAENTRYSIZE) + <font class="keyword">sizeof</font>(rawOffset), &amp;rawSize, <font class="keyword">sizeof</font>(rawSize));
00067 }
00068 
00069 
00070 <font class="keyword">const</font> <font class="keywordtype">char</font> *EntriesBlock::getRawData(<font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> *retSize) {
00071         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> max = 4;
00072         <font class="keywordtype">int</font> loop;
00073         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> offset;
00074         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> size;
00075         <font class="keywordflow">for</font> (loop = 0; loop &lt; getCount(); loop++) {
00076                 getMetaEntry(loop, &amp;offset, &amp;size);
00077                 max = ((offset + size) &gt; max) ? (offset + size) : max;
00078         }
00079         *retSize = max;
00080         <font class="keywordflow">return</font> block;
00081 }
00082 
00083 
00084 <font class="keywordtype">int</font> EntriesBlock::addEntry(<font class="keyword">const</font> <font class="keywordtype">char</font> *entry) {
00085         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> dataSize;
00086         getRawData(&amp;dataSize);
00087         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font>  len = strlen(entry);
00088         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> offset;
00089         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> size;
00090         <font class="keywordtype">int</font> count = getCount();
00091         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> dataStart = METAHEADERSIZE + (count * METAENTRYSIZE);
00092         <font class="comment">// new meta entry + new data size + 1 because null </font>
00093         block = (<font class="keywordtype">char</font> *)realloc(block, dataSize + METAENTRYSIZE + len + 1);
00094         <font class="comment">// shift right to make room for new meta entry</font>
00095         memmove(block + dataStart + METAENTRYSIZE, block + dataStart, dataSize - dataStart);
00096 
00097         <font class="keywordflow">for</font> (<font class="keywordtype">int</font> loop = 0; loop &lt; count; loop++) {
00098                 getMetaEntry(loop, &amp;offset, &amp;size);
00099                 <font class="keywordflow">if</font> (offset) {   <font class="comment">// if not a deleted entry</font>
00100                         offset += METAENTRYSIZE;
00101                         setMetaEntry(loop, offset, size);
00102                 }
00103         }
00104 
00105         offset = dataSize;      <font class="comment">// original dataSize before realloc</font>
00106         size = len + 1;
00107         <font class="comment">// add our text to the end</font>
00108         memcpy(block + offset + METAENTRYSIZE, entry, size);
00109         <font class="comment">// increment count</font>
00110         setCount(count + 1);
00111         <font class="comment">// add our meta entry</font>
00112         setMetaEntry(count, offset + METAENTRYSIZE, size);
00113         <font class="comment">// return index of our new entry</font>
00114         <font class="keywordflow">return</font> count;
00115 }
00116 
00117 
00118 <font class="keyword">const</font> <font class="keywordtype">char</font> *EntriesBlock::getEntry(<font class="keywordtype">int</font> entryIndex) {
00119         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> offset;
00120         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> size;
00121         <font class="keyword">static</font> <font class="keywordtype">char</font> *empty = <font class="stringliteral">""</font>;
00122 
00123         getMetaEntry(entryIndex, &amp;offset, &amp;size);
00124         <font class="keywordflow">return</font> (offset) ? block+offset : empty;
00125 }
00126 
00127 
00128 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> EntriesBlock::getEntrySize(<font class="keywordtype">int</font> entryIndex) {
00129         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> offset;
00130         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> size;
00131 
00132         getMetaEntry(entryIndex, &amp;offset, &amp;size);
00133         <font class="keywordflow">return</font> (offset) ? size : 0;
00134 }
00135 
00136 
00137 <font class="keywordtype">void</font> EntriesBlock::removeEntry(<font class="keywordtype">int</font> entryIndex) {
00138         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> offset;
00139         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> size, size2;
00140         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> dataSize;
00141         getRawData(&amp;dataSize);
00142         getMetaEntry(entryIndex, &amp;offset, &amp;size);
00143         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> len = size - 1;
00144         <font class="keywordtype">int</font> count = getCount();
00145         <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> dataStart = METAHEADERSIZE + (count * METAENTRYSIZE);
00146 
00147         <font class="keywordflow">if</font> (!offset)    <font class="comment">// already deleted</font>
00148                 <font class="keywordflow">return</font>;
00149 
00150         <font class="comment">// shift left to retrieve space used for old entry</font>
00151         memmove(block + offset, block + offset + size, dataSize - (offset + size));
00152 
00153         <font class="comment">// fix offset for all entries after our entry that were shifted left</font>
00154         <font class="keywordflow">for</font> (<font class="keywordtype">int</font> loop = entryIndex + 1; loop &lt; count; loop++) {
00155                 getMetaEntry(loop, &amp;offset, &amp;size2);
00156                 <font class="keywordflow">if</font> (offset) {   <font class="comment">// if not a deleted entry</font>
00157                         offset -= size;
00158                         setMetaEntry(loop, offset, size2);
00159                 }
00160         }
00161 
00162         <font class="comment">// zero out our meta entry</font>
00163         setMetaEntry(entryIndex, 0L, 0);
00164 }
00165 
00166 
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