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