266 lines
7.0 KiB
C
266 lines
7.0 KiB
C
/**
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* \file rpmdb/fprint.c
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*/
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#include "system.h"
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#include "rpmdb.h"
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#include "rpmmacro.h" /* XXX for rpmCleanPath */
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#include "fprint.h"
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#include "debug.h"
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fingerPrintCache fpCacheCreate(int sizeHint)
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{
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fingerPrintCache fpc;
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fpc = xmalloc(sizeof(*fpc));
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fpc->ht = htCreate(sizeHint * 2, 0, 1, hashFunctionString,
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hashEqualityString);
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return fpc;
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}
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void fpCacheFree(fingerPrintCache cache)
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{
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htFree(cache->ht);
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free(cache);
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}
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/**
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* Find directory name entry in cache.
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* @param cache pointer to fingerprint cache
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* @param dirName string to locate in cache
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* @return pointer to directory name entry (or NULL if not found).
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*/
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static /*@null@*/ const struct fprintCacheEntry_s * cacheContainsDirectory(
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fingerPrintCache cache,
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const char * dirName)
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/*@*/
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{
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const void ** data;
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if (htGetEntry(cache->ht, dirName, &data, NULL, NULL))
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return NULL;
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return data[0];
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}
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/**
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* Return finger print of a file path.
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* @param cache pointer to fingerprint cache
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* @param dirName leading directory name of path
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* @param baseName file name of path
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* @param scareMemory
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* @return pointer to the finger print associated with a file path.
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*/
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static fingerPrint doLookup(fingerPrintCache cache,
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const char * dirName, const char * baseName, int scareMemory)
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/*@modifies cache @*/
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{
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char dir[PATH_MAX];
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const char * cleanDirName;
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size_t cdnl;
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char * end; /* points to the '\0' at the end of "buf" */
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fingerPrint fp;
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struct stat sb;
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char * buf;
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const struct fprintCacheEntry_s * cacheHit;
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/* assert(*dirName == '/' || !scareMemory); */
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/* XXX WATCHOUT: fp.subDir is set below from relocated dirName arg */
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cleanDirName = dirName;
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cdnl = strlen(cleanDirName);
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if (*cleanDirName == '/') {
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/*@-branchstate@*/
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if (!scareMemory)
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cleanDirName =
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rpmCleanPath(strcpy(alloca(cdnl+1), dirName));
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/*@=branchstate@*/
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} else {
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scareMemory = 0; /* XXX causes memory leak */
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/* Using realpath on the arg isn't correct if the arg is a symlink,
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* especially if the symlink is a dangling link. What we
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* do instead is use realpath() on `.' and then append arg to
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* the result.
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*/
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/* if the current directory doesn't exist, we might fail.
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oh well. likewise if it's too long. */
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dir[0] = '\0';
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/*@-branchstate@*/
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if (realpath(".", dir) != NULL) {
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end = dir + strlen(dir);
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if (end[-1] != '/') *end++ = '/';
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end = stpncpy(end, cleanDirName, sizeof(dir) - (end - dir));
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*end = '\0';
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(void)rpmCleanPath(dir); /* XXX possible /../ from concatenation */
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end = dir + strlen(dir);
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if (end[-1] != '/') *end++ = '/';
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*end = '\0';
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cleanDirName = dir;
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cdnl = end - dir;
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}
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/*@=branchstate@*/
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}
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fp.entry = NULL;
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fp.subDir = NULL;
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fp.baseName = NULL;
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/*@-nullret@*/
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if (cleanDirName == NULL) return fp; /* XXX can't happen */
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/*@=nullret@*/
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buf = strcpy(alloca(cdnl + 1), cleanDirName);
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end = buf + cdnl;
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/* no need to pay attention to that extra little / at the end of dirName */
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if (buf[1] && end[-1] == '/') {
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end--;
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*end = '\0';
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}
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while (1) {
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/* as we're stating paths here, we want to follow symlinks */
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cacheHit = cacheContainsDirectory(cache, (*buf != '\0' ? buf : "/"));
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if (cacheHit != NULL) {
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fp.entry = cacheHit;
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} else if (!stat((*buf != '\0' ? buf : "/"), &sb)) {
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size_t nb = sizeof(*fp.entry) + (*buf != '\0' ? (end-buf) : 1) + 1;
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char * dn = xmalloc(nb);
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struct fprintCacheEntry_s * newEntry = (void *)dn;
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/*@-usereleased@*/ /* LCL: contiguous malloc confusion */
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dn += sizeof(*newEntry);
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strcpy(dn, (*buf != '\0' ? buf : "/"));
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newEntry->ino = sb.st_ino;
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newEntry->dev = sb.st_dev;
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newEntry->isFake = 0;
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newEntry->dirName = dn;
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fp.entry = newEntry;
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/*@-kepttrans -dependenttrans @*/
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htAddEntry(cache->ht, dn, fp.entry);
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/*@=kepttrans =dependenttrans @*/
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/*@=usereleased@*/
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}
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if (fp.entry) {
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fp.subDir = cleanDirName + (end - buf);
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if (fp.subDir[0] == '/' && fp.subDir[1] != '\0')
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fp.subDir++;
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if (fp.subDir[0] == '\0' ||
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/* XXX don't bother saving '/' as subdir */
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(fp.subDir[0] == '/' && fp.subDir[1] == '\0'))
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fp.subDir = NULL;
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fp.baseName = baseName;
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if (!scareMemory && fp.subDir != NULL)
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fp.subDir = xstrdup(fp.subDir);
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/*@-compdef@*/ /* FIX: fp.entry.{dirName,dev,ino,isFake} undef @*/
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return fp;
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/*@=compdef@*/
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}
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/* stat of '/' just failed! */
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if (end == buf + 1)
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abort();
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end--;
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while ((end > buf) && *end != '/') end--;
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if (end == buf) /* back to stat'ing just '/' */
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end++;
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*end = '\0';
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}
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/*@notreached@*/
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/*@-compdef@*/ /* FIX: fp.entry.{dirName,dev,ino,isFake} undef @*/
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/*@-nullret@*/ return fp; /*@=nullret@*/ /* LCL: can't happen. */
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/*@=compdef@*/
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}
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fingerPrint fpLookup(fingerPrintCache cache, const char * dirName,
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const char * baseName, int scareMemory)
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{
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return doLookup(cache, dirName, baseName, scareMemory);
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}
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unsigned int fpHashFunction(const void * key)
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{
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const fingerPrint * fp = key;
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unsigned int hash = 0;
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char ch;
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const char * chptr;
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ch = 0;
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chptr = fp->baseName;
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while (*chptr != '\0') ch ^= *chptr++;
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hash |= ((unsigned)ch) << 24;
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hash |= (((((unsigned)fp->entry->dev) >> 8) ^ fp->entry->dev) & 0xFF) << 16;
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hash |= fp->entry->ino & 0xFFFF;
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return hash;
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}
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int fpEqual(const void * key1, const void * key2)
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{
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const fingerPrint *k1 = key1;
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const fingerPrint *k2 = key2;
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/* If the addresses are the same, so are the values. */
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if (k1 == k2)
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return 0;
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/* Otherwise, compare fingerprints by value. */
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/*@-nullpass@*/ /* LCL: whines about (*k2).subdir */
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if (FP_EQUAL(*k1, *k2))
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return 0;
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/*@=nullpass@*/
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return 1;
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}
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void fpLookupList(fingerPrintCache cache, const char ** dirNames,
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const char ** baseNames, const int * dirIndexes,
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int fileCount, fingerPrint * fpList)
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{
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int i;
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for (i = 0; i < fileCount; i++) {
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/* If this is in the same directory as the last file, don't bother
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redoing all of this work */
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if (i > 0 && dirIndexes[i - 1] == dirIndexes[i]) {
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fpList[i].entry = fpList[i - 1].entry;
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fpList[i].subDir = fpList[i - 1].subDir;
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fpList[i].baseName = baseNames[i];
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} else {
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fpList[i] = doLookup(cache, dirNames[dirIndexes[i]], baseNames[i],
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1);
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}
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}
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}
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void fpLookupHeader(fingerPrintCache cache, Header h, fingerPrint * fpList)
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{
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HGE_t hge = (HGE_t)headerGetEntryMinMemory;
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HFD_t hfd = headerFreeData;
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const char ** baseNames, ** dirNames;
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rpmTagType bnt, dnt;
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int_32 * dirIndexes;
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int fileCount;
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int xx;
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if (!hge(h, RPMTAG_BASENAMES, &bnt, (void **) &baseNames, &fileCount))
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return;
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xx = hge(h, RPMTAG_DIRNAMES, &dnt, (void **) &dirNames, NULL);
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xx = hge(h, RPMTAG_DIRINDEXES, NULL, (void **) &dirIndexes, NULL);
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fpLookupList(cache, dirNames, baseNames, dirIndexes, fileCount, fpList);
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dirNames = hfd(dirNames, dnt);
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baseNames = hfd(baseNames, bnt);
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}
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