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rpmpkg.c
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rpmpkg.c
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <fcntl.h>
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include "rpmpkg.h"
#define RPMRC_FAIL 2
#define RPMRC_NOTFOUND 1
#define RPMRC_OK 0
#ifdef RPMPKG_LZO
static int rpmpkgLZOCompress(unsigned char **blobp, unsigned int *bloblp);
static int rpmpkgLZODecompress(unsigned char **blobp, unsigned int *bloblp);
#endif
typedef struct pkgslot_s {
unsigned int pkgidx;
unsigned int blkoff;
unsigned int blkcnt;
unsigned int slotno;
} pkgslot;
typedef struct rpmpkgdb_s {
int fd; /* our file descriptor */
int flags;
int mode;
int rdonly;
unsigned int locked_shared;
unsigned int locked_excl;
int header_ok; /* header data (e.g. generation) is valid */
unsigned int generation;
unsigned int slotnpages;
unsigned int nextpkgidx;
struct pkgslot_s *slots;
unsigned int aslots; /* allocated slots */
unsigned int nslots; /* used slots */
unsigned int *slothash;
unsigned int nslothash;
unsigned int freeslot; /* first free slot */
int slotorder;
char *filename;
unsigned int fileblks; /* file size in blks */
int dofsync;
} * rpmpkgdb;
#define SLOTORDER_UNORDERED 0
#define SLOTORDER_BLKOFF 1
static inline unsigned int le2h(unsigned char *p)
{
return p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
}
static inline void h2le(unsigned int x, unsigned char *p)
{
p[0] = x;
p[1] = x >> 8;
p[2] = x >> 16;
p[3] = x >> 24;
}
/* adler 32 algorithm taken from RFC 1950 */
#define ADLER32_INIT 1
static unsigned int update_adler32(unsigned int adler, unsigned char *buf, unsigned int len)
{
unsigned int s1 = adler & 0xffff;
unsigned int s2 = (adler >> 16) & 0xffff;
int n;
for (; len >= 5552; len -= 5552) {
for (n = 0; n < 5552; n++) {
s1 += *buf++;
s2 += s1;
}
s1 %= 65521;
s2 %= 65521;
}
for (n = 0; n < len; n++) {
s1 += *buf++;
s2 += s1;
}
return ((s2 % 65521) << 16) + (s1 % 65521);
}
/*** Header management ***/
#define PKGDB_MAGIC ('R' | 'p' << 8 | 'm' << 16 | 'P' << 24)
#define PKGDB_VERSION 0
/* must be a multiple of SLOT_SIZE! */
#define PKGDB_HEADER_SIZE 32
#define PKGDB_OFFSET_MAGIC 0
#define PKGDB_OFFSET_VERSION 4
#define PKGDB_OFFSET_GENERATION 8
#define PKGDB_OFFSET_SLOTNPAGES 12
#define PKGDB_OFFSET_NEXTPKGIDX 16
static int rpmpkgReadHeader(rpmpkgdb pkgdb)
{
unsigned int generation, slotnpages, nextpkgidx;
unsigned char header[PKGDB_HEADER_SIZE];
/* if we always head the write lock then our data matches */
if (pkgdb->header_ok)
return RPMRC_OK;
if (pread(pkgdb->fd, header, PKGDB_HEADER_SIZE, 0) != PKGDB_HEADER_SIZE) {
return RPMRC_FAIL;
}
if (le2h(header + PKGDB_OFFSET_MAGIC) != PKGDB_MAGIC) {
return RPMRC_FAIL;
}
generation = le2h(header + PKGDB_OFFSET_GENERATION);
slotnpages = le2h(header + PKGDB_OFFSET_SLOTNPAGES);
nextpkgidx = le2h(header + PKGDB_OFFSET_NEXTPKGIDX);
/* free slots if our internal data no longer matches */
if (pkgdb->slots && (pkgdb->generation != generation || pkgdb->slotnpages != slotnpages)) {
free(pkgdb->slots);
pkgdb->slots = 0;
if (pkgdb->slothash) {
free(pkgdb->slothash);
pkgdb->slothash = 0;
}
}
pkgdb->generation = generation;
pkgdb->slotnpages = slotnpages;
pkgdb->nextpkgidx = nextpkgidx;
pkgdb->header_ok = 1;
return RPMRC_OK;
}
static int rpmpkgWriteHeader(rpmpkgdb pkgdb)
{
unsigned char header[PKGDB_HEADER_SIZE];
memset(header, 0, sizeof(header));
h2le(PKGDB_MAGIC, header + PKGDB_OFFSET_MAGIC);
h2le(PKGDB_VERSION, header + PKGDB_OFFSET_VERSION);
h2le(pkgdb->generation, header + PKGDB_OFFSET_GENERATION);
h2le(pkgdb->slotnpages, header + PKGDB_OFFSET_SLOTNPAGES);
h2le(pkgdb->nextpkgidx, header + PKGDB_OFFSET_NEXTPKGIDX);
if (pwrite(pkgdb->fd, header, sizeof(header), 0) != sizeof(header)) {
return RPMRC_FAIL;
}
if (pkgdb->dofsync && fdatasync(pkgdb->fd))
return RPMRC_FAIL; /* write error */
return RPMRC_OK;
}
/*** Slot management ***/
#define SLOT_MAGIC ('S' | 'l' << 8 | 'o' << 16 | 't' << 24)
#define SLOT_SIZE 16
#define BLK_SIZE 16
#define PAGE_SIZE 4096
/* the first slots (i.e. 32 bytes) are used for the header */
#define SLOT_START (PKGDB_HEADER_SIZE / SLOT_SIZE)
static inline unsigned int hashpkgidx(unsigned int h)
{
h *= 0x5bd1e995;
h ^= h >> 16;
return h;
}
static int rpmpkgHashSlots(rpmpkgdb pkgdb)
{
unsigned int nslots, num;
unsigned int *hash;
unsigned int h, hh, hmask;
int i;
pkgslot *slot;
pkgdb->nslothash = 0;
num = pkgdb->nslots;
while (num & (num - 1))
num = num & (num - 1);
num *= 4;
hash = pkgdb->slothash;
if (!hash || pkgdb->nslothash != num) {
free(pkgdb->slothash);
hash = pkgdb->slothash = calloc(num, sizeof(unsigned int));
if (!hash)
return RPMRC_FAIL;
pkgdb->nslothash = num;
} else {
memset(hash, 0, num * sizeof(unsigned int));
}
hmask = num - 1;
nslots = pkgdb->nslots;
for (i = 0, slot = pkgdb->slots; i < nslots; i++, slot++) {
for (h = hashpkgidx(slot->pkgidx) & hmask, hh = 7; hash[h] != 0; h = (h + hh++) & hmask)
;
hash[h] = i + 1;
}
pkgdb->slothash = hash;
pkgdb->nslothash = num;
return RPMRC_OK;
}
static int rpmpkgReadSlots(rpmpkgdb pkgdb)
{
unsigned int slotnpages = pkgdb->slotnpages;
struct stat stb;
unsigned char pagebuf[PAGE_SIZE];
unsigned int page;
unsigned int i, minblkoff, fileblks, slotno, freeslot, o;
pkgslot *slot;
/* free old slot data */
if (pkgdb->slots) {
free(pkgdb->slots);
pkgdb->slots = 0;
}
if (pkgdb->slothash) {
free(pkgdb->slothash);
pkgdb->slothash = 0;
}
pkgdb->nslots = 0;
pkgdb->freeslot = 0;
/* calculate current database size in blks */
if (fstat(pkgdb->fd, &stb))
return RPMRC_FAIL;
if (stb.st_size % BLK_SIZE)
return RPMRC_FAIL; /* hmm */
fileblks = stb.st_size / BLK_SIZE;
/* read (and somewhat verify) all slots */
pkgdb->aslots = slotnpages * (PAGE_SIZE / SLOT_SIZE);
pkgdb->slots = calloc(pkgdb->aslots, sizeof(*pkgdb->slots));
if (!pkgdb->slots) {
return RPMRC_FAIL;
}
i = 0;
slot = pkgdb->slots;
minblkoff = slotnpages * (PAGE_SIZE / BLK_SIZE);
slotno = SLOT_START;
freeslot = 0;
for (page = 0; page < slotnpages; page++) {
if (pread(pkgdb->fd, pagebuf, PAGE_SIZE, page * PAGE_SIZE) != PAGE_SIZE)
return RPMRC_FAIL;
for (o = page ? 0 : SLOT_START * SLOT_SIZE; o < PAGE_SIZE; o += SLOT_SIZE, slotno++) {
unsigned char *pp = pagebuf + o;
unsigned int blkoff, blkcnt, pkgidx;
if (le2h(pp) != SLOT_MAGIC) {
return RPMRC_FAIL;
}
blkoff = le2h(pp + 8);
if (!blkoff) {
if (!freeslot)
freeslot = slotno;
continue;
}
pkgidx = le2h(pp + 4);
blkcnt = le2h(pp + 12);
slot->pkgidx = pkgidx;
slot->blkoff = blkoff;
slot->blkcnt = blkcnt;
slot->slotno = slotno;
if (slot->blkoff + slot->blkcnt > fileblks)
return RPMRC_FAIL; /* truncated database */
if (!slot->pkgidx || !slot->blkcnt || slot->blkoff < minblkoff)
return RPMRC_FAIL; /* bad entry */
i++;
slot++;
}
}
pkgdb->nslots = i;
pkgdb->slotorder = SLOTORDER_UNORDERED; /* XXX: always order? */
pkgdb->fileblks = fileblks;
pkgdb->freeslot = freeslot;
if (rpmpkgHashSlots(pkgdb)) {
free(pkgdb->slots);
pkgdb->slots = 0;
return RPMRC_FAIL;
}
return RPMRC_OK;
}
static int orderslots_blkoff_cmp(const void *a, const void *b)
{
unsigned int blkoffa = ((const pkgslot *)a)->blkoff;
unsigned int blkoffb = ((const pkgslot *)b)->blkoff;
return blkoffa > blkoffb ? 1 : blkoffa < blkoffb ? -1 : 0;
}
static void rpmpkgOrderSlots(rpmpkgdb pkgdb, int slotorder)
{
if (pkgdb->slotorder == slotorder)
return;
if (slotorder == SLOTORDER_BLKOFF) {
if (pkgdb->nslots > 1)
qsort(pkgdb->slots, pkgdb->nslots, sizeof(*pkgdb->slots), orderslots_blkoff_cmp);
}
pkgdb->slotorder = slotorder;
rpmpkgHashSlots(pkgdb);
}
static inline pkgslot *rpmpkgFindSlot(rpmpkgdb pkgdb, unsigned int pkgidx)
{
unsigned int i, h, hh, hmask = pkgdb->nslothash - 1;
unsigned int *hash = pkgdb->slothash;
for (h = hashpkgidx(pkgidx) & hmask, hh = 7; (i = hash[h]) != 0; h = (h + hh++) & hmask)
if (pkgdb->slots[i - 1].pkgidx == pkgidx)
return pkgdb->slots + (i - 1);
return 0;
}
static int rpmpkgFindEmptyOffset(rpmpkgdb pkgdb, unsigned int pkgidx, unsigned int blkcnt, unsigned *blkoffp, pkgslot **oldslotp, int dontprepend)
{
unsigned int i, nslots = pkgdb->nslots;
unsigned int bestblkoff = 0;
unsigned int freecnt, bestfreecnt = 0;
unsigned int lastblkend = pkgdb->slotnpages * (PAGE_SIZE / BLK_SIZE);
pkgslot *slot, *oldslot = 0;
if (pkgdb->slotorder != SLOTORDER_BLKOFF)
rpmpkgOrderSlots(pkgdb, SLOTORDER_BLKOFF);
if (dontprepend && nslots) {
lastblkend = pkgdb->slots[0].blkoff;
}
/* best fit strategy */
for (i = 0, slot = pkgdb->slots; i < nslots; i++, slot++) {
if (slot->blkoff < lastblkend) {
return RPMRC_FAIL; /* eek, slots overlap! */
}
if (slot->pkgidx == pkgidx) {
if (oldslot) {
return RPMRC_FAIL; /* eek, two slots with our pkgid ! */
}
oldslot = slot;
}
freecnt = slot->blkoff - lastblkend;
if (freecnt >= blkcnt) {
if (!bestblkoff || bestfreecnt > freecnt) {
bestblkoff = lastblkend;
bestfreecnt = freecnt;
}
}
lastblkend = slot->blkoff + slot->blkcnt;
}
if (!bestblkoff) {
bestblkoff = lastblkend; /* append to end */
}
*oldslotp = oldslot;
*blkoffp = bestblkoff;
return RPMRC_OK;
}
static int rpmpkgWriteslot(rpmpkgdb pkgdb, unsigned int slotno, unsigned int pkgidx, unsigned int blkoff, unsigned int blkcnt)
{
unsigned char buf[SLOT_SIZE];
/* sanity */
if (slotno < SLOT_START)
return RPMRC_FAIL;
if (blkoff && slotno == pkgdb->freeslot)
pkgdb->freeslot = 0;
h2le(SLOT_MAGIC, buf);
h2le(pkgidx, buf + 4);
h2le(blkoff, buf + 8);
h2le(blkcnt, buf + 12);
if (pwrite(pkgdb->fd, buf, sizeof(buf), slotno * SLOT_SIZE) != sizeof(buf)) {
return RPMRC_FAIL;
}
pkgdb->generation++;
if (rpmpkgWriteHeader(pkgdb)) {
return RPMRC_FAIL;
}
return RPMRC_OK;
}
static int rpmpkgWriteEmptySlotpage(rpmpkgdb pkgdb, int pageno)
{
unsigned char page[PAGE_SIZE];
int i, off = pageno ? 0 : SLOT_START * SLOT_SIZE;
memset(page, 0, sizeof(page));
for (i = 0; i < PAGE_SIZE / SLOT_SIZE; i++)
h2le(SLOT_MAGIC, page + i * SLOT_SIZE);
if (pwrite(pkgdb->fd, page, PAGE_SIZE - off, pageno * PAGE_SIZE + off) != PAGE_SIZE - off) {
return RPMRC_FAIL;
}
if (pkgdb->dofsync && fdatasync(pkgdb->fd)) {
return RPMRC_FAIL; /* write error */
}
return RPMRC_OK;
}
/*** Blk primitives ***/
static int rpmpkgZeroBlks(rpmpkgdb pkgdb, unsigned int blkoff, unsigned int blkcnt)
{
unsigned char buf[65536];
unsigned int towrite;
off_t fileoff;
memset(buf, 0, sizeof(buf));
fileoff = (off_t)blkoff * BLK_SIZE;
for (towrite = blkcnt * BLK_SIZE; towrite; ) {
unsigned int chunk = towrite > 65536 ? 65536 : towrite;
if (pwrite(pkgdb->fd, buf, chunk, fileoff) != chunk) {
return RPMRC_FAIL; /* write error */
}
fileoff += chunk;
towrite -= chunk;
}
if (blkoff + blkcnt > pkgdb->fileblks)
pkgdb->fileblks = blkoff + blkcnt;
return RPMRC_OK;
}
static int rpmpkgValidateZero(rpmpkgdb pkgdb, unsigned int blkoff, unsigned int blkcnt)
{
unsigned long long buf[(65536 / sizeof(unsigned long long)) + 1];
off_t fileoff;
off_t tocheck;
int i;
if (blkoff > pkgdb->fileblks)
return RPMRC_FAIL; /* huh? */
fileoff = (off_t)blkoff * BLK_SIZE;
tocheck = blkoff + blkcnt > pkgdb->fileblks ? pkgdb->fileblks - blkoff : blkcnt;
tocheck *= BLK_SIZE;
while (tocheck >= 65536) {
if (pread(pkgdb->fd, (void *)buf, 65536, fileoff) != 65536)
return RPMRC_FAIL; /* read error */
for (i = 0; i < 65536 / sizeof(unsigned long long); i++)
if (buf[i])
return RPMRC_FAIL; /* not empty */
fileoff += 65536;
tocheck -= 65536;
}
if (tocheck) {
int cnt = (int)tocheck / sizeof(unsigned long long);
buf[cnt++] = 0;
if (pread(pkgdb->fd, (void *)buf, tocheck, fileoff) != tocheck)
return RPMRC_FAIL; /* read error */
for (i = 0; i < cnt; i++)
if (buf[i])
return RPMRC_FAIL; /* not empty */
}
return RPMRC_OK;
}
/*** Blob primitives ***/
/* head: magic + pkgidx + timestamp + bloblen */
/* tail: adler32 + bloblen + magic */
#define BLOBHEAD_MAGIC ('B' | 'l' << 8 | 'b' << 16 | 'S' << 24)
#define BLOBTAIL_MAGIC ('B' | 'l' << 8 | 'b' << 16 | 'E' << 24)
#define BLOBHEAD_SIZE (4 + 4 + 4 + 4)
#define BLOBTAIL_SIZE (4 + 4 + 4)
static int rpmpkgReadBlob(rpmpkgdb pkgdb, unsigned int pkgidx, unsigned int blkoff, unsigned int blkcnt, unsigned char *blob, unsigned int *bloblp, unsigned int *tstampp)
{
unsigned char buf[BLOBHEAD_SIZE > BLOBTAIL_SIZE ? BLOBHEAD_SIZE : BLOBTAIL_SIZE];
unsigned int bloblen, toread, tstamp;
off_t fileoff;
unsigned int adl;
int verifyadler = bloblp ? 0 : 1;
/* sanity */
if (blkcnt < (BLOBHEAD_SIZE + BLOBTAIL_SIZE + BLK_SIZE - 1) / BLK_SIZE)
return RPMRC_FAIL; /* blkcnt too small */
/* read header */
fileoff = (off_t)blkoff * BLK_SIZE;
if (pread(pkgdb->fd, buf, BLOBHEAD_SIZE, fileoff) != BLOBHEAD_SIZE)
return RPMRC_FAIL; /* read error */
if (le2h(buf) != BLOBHEAD_MAGIC)
return RPMRC_FAIL; /* bad blob */
if (le2h(buf + 4) != pkgidx)
return RPMRC_FAIL; /* bad blob */
tstamp = le2h(buf + 8);
bloblen = le2h(buf + 12);
if (blkcnt != (BLOBHEAD_SIZE + bloblen + BLOBTAIL_SIZE + BLK_SIZE - 1) / BLK_SIZE)
return RPMRC_FAIL; /* bad blob */
adl = ADLER32_INIT;
if (verifyadler)
adl = update_adler32(adl, buf, BLOBHEAD_SIZE);
/* read in 64K chunks */
fileoff += BLOBHEAD_SIZE;
toread = blkcnt * BLK_SIZE - BLOBHEAD_SIZE;
if (!bloblp)
toread -= BLOBTAIL_SIZE;
while (toread) {
unsigned int chunk = toread > 65536 ? 65536 : toread;
if (pread(pkgdb->fd, blob, chunk, fileoff) != chunk) {
return RPMRC_FAIL; /* read error */
}
if (verifyadler) {
if (!bloblp)
adl = update_adler32(adl, blob, chunk);
else if (toread > BLOBTAIL_SIZE)
adl = update_adler32(adl, blob, toread - BLOBTAIL_SIZE > chunk ? chunk : toread - BLOBTAIL_SIZE);
}
if (bloblp)
blob += chunk;
toread -= chunk;
fileoff += chunk;
}
/* read trailer */
if (bloblp) {
memcpy(buf, blob - BLOBTAIL_SIZE, BLOBTAIL_SIZE);
} else if (pread(pkgdb->fd, buf, BLOBTAIL_SIZE, fileoff) != BLOBTAIL_SIZE) {
return RPMRC_FAIL; /* read error */
}
if (verifyadler && le2h(buf) != adl) {
return RPMRC_FAIL; /* bad blob, adler32 mismatch */
}
if (le2h(buf + 4) != bloblen) {
return RPMRC_FAIL; /* bad blob, bloblen mismatch */
}
if (le2h(buf + 8) != BLOBTAIL_MAGIC) {
return RPMRC_FAIL; /* bad blob */
}
if (bloblp)
*bloblp = bloblen;
if (tstampp)
*tstampp = tstamp;
return RPMRC_OK;
}
static int rpmpkgVerifyblob(rpmpkgdb pkgdb, unsigned int pkgidx, unsigned int blkoff, unsigned int blkcnt)
{
unsigned char buf[65536];
return rpmpkgReadBlob(pkgdb, pkgidx, blkoff, blkcnt, buf, 0, 0);
}
static int rpmpkgWriteBlob(rpmpkgdb pkgdb, unsigned int pkgidx, unsigned int blkoff, unsigned int blkcnt, unsigned char *blob, unsigned int blobl, unsigned int now)
{
unsigned char buf[(BLOBHEAD_SIZE > BLOBTAIL_SIZE ? BLOBHEAD_SIZE : BLOBTAIL_SIZE) + BLK_SIZE];
unsigned int towrite, pad;
unsigned int adl;
off_t fileoff;
/* sanity */
if (blkcnt < (BLOBHEAD_SIZE + BLOBTAIL_SIZE + BLK_SIZE - 1) / BLK_SIZE)
return RPMRC_FAIL; /* blkcnt too small */
if (blkcnt != (BLOBHEAD_SIZE + blobl + BLOBTAIL_SIZE + BLK_SIZE - 1) / BLK_SIZE)
return RPMRC_FAIL; /* blkcnt mismatch */
fileoff = (off_t)blkoff * BLK_SIZE;
h2le(BLOBHEAD_MAGIC, buf);
h2le(pkgidx, buf + 4);
h2le(now, buf + 8);
h2le(blobl, buf + 12);
if (pwrite(pkgdb->fd, buf, BLOBHEAD_SIZE, fileoff) != BLOBHEAD_SIZE) {
return RPMRC_FAIL; /* write error */
}
adl = ADLER32_INIT;
adl = update_adler32(adl, buf, BLOBHEAD_SIZE);
/* write in 64K chunks */
fileoff += BLOBHEAD_SIZE;
for (towrite = blobl; towrite;) {
unsigned int chunk = towrite > 65536 ? 65536 : towrite;
if (pwrite(pkgdb->fd, blob, chunk, fileoff) != chunk) {
return RPMRC_FAIL; /* write error */
}
adl = update_adler32(adl, blob, chunk);
blob += chunk;
towrite -= chunk;
fileoff += chunk;
}
/* pad if needed */
pad = blkcnt * BLK_SIZE - (BLOBHEAD_SIZE + blobl + BLOBTAIL_SIZE);
if (pad) {
memset(buf + (sizeof(buf) - BLOBTAIL_SIZE) - pad, 0, pad);
adl = update_adler32(adl, buf + (sizeof(buf) - BLOBTAIL_SIZE) - pad, pad);
}
h2le(adl, buf + (sizeof(buf) - BLOBTAIL_SIZE));
h2le(blobl, buf + (sizeof(buf) - BLOBTAIL_SIZE) + 4);
h2le(BLOBTAIL_MAGIC, buf + (sizeof(buf) - BLOBTAIL_SIZE) + 8);
if (pwrite(pkgdb->fd, buf + (sizeof(buf) - BLOBTAIL_SIZE) - pad, pad + BLOBTAIL_SIZE, fileoff) != pad + BLOBTAIL_SIZE) {
return RPMRC_FAIL; /* write error */
}
/* update file length */
if (blkoff + blkcnt > pkgdb->fileblks)
pkgdb->fileblks = blkoff + blkcnt;
if (pkgdb->dofsync && fdatasync(pkgdb->fd)) {
return RPMRC_FAIL; /* write error */
}
return RPMRC_OK;
}
static int rpmpkgDelBlob(rpmpkgdb pkgdb, unsigned int pkgidx, unsigned int blkoff, unsigned int blkcnt)
{
if (rpmpkgVerifyblob(pkgdb, pkgidx, blkoff, blkcnt))
return RPMRC_FAIL;
if (rpmpkgZeroBlks(pkgdb, blkoff, blkcnt))
return RPMRC_FAIL;
if (pkgdb->dofsync && fdatasync(pkgdb->fd))
return RPMRC_FAIL; /* write error */
return RPMRC_OK;
}
static int rpmpkgMoveBlob(rpmpkgdb pkgdb, pkgslot *slot, unsigned int newblkoff)
{
unsigned int pkgidx = slot->pkgidx;
unsigned int blkoff = slot->blkoff;
unsigned int blkcnt = slot->blkcnt;
unsigned char *blob;
unsigned int tstamp, blobl;
blob = malloc((size_t)blkcnt * BLK_SIZE);
if (rpmpkgReadBlob(pkgdb, pkgidx, blkoff, blkcnt, blob, &blobl, &tstamp)) {
free(blob);
return RPMRC_FAIL;
}
if (rpmpkgWriteBlob(pkgdb, pkgidx, newblkoff, blkcnt, blob, blobl, tstamp)) {
free(blob);
return RPMRC_FAIL;
}
free(blob);
if (rpmpkgWriteslot(pkgdb, slot->slotno, pkgidx, newblkoff, blkcnt)) {
return RPMRC_FAIL;
}
if (rpmpkgDelBlob(pkgdb, pkgidx, blkoff, blkcnt)) {
return RPMRC_FAIL;
}
slot->blkoff = newblkoff;
pkgdb->slotorder = SLOTORDER_UNORDERED;
return RPMRC_OK;
}
static int rpmpkgAddSlotPage(rpmpkgdb pkgdb)
{
unsigned int cutoff;
if (pkgdb->slotorder != SLOTORDER_BLKOFF)
rpmpkgOrderSlots(pkgdb, SLOTORDER_BLKOFF);
cutoff = (pkgdb->slotnpages + 1) * (PAGE_SIZE / BLK_SIZE);
/* now move every blob before cutoff */
while (pkgdb->nslots && pkgdb->slots[0].blkoff < cutoff) {
unsigned int newblkoff;
pkgslot *slot = pkgdb->slots, *oldslot;
oldslot = 0;
if (rpmpkgFindEmptyOffset(pkgdb, slot->pkgidx, slot->blkcnt, &newblkoff, &oldslot, 1)) {
return RPMRC_FAIL;
}
if (!oldslot || oldslot != slot) {
return RPMRC_FAIL;
}
if (rpmpkgMoveBlob(pkgdb, slot, newblkoff)) {
return RPMRC_FAIL;
}
rpmpkgOrderSlots(pkgdb, SLOTORDER_BLKOFF);
}
/* make sure our new page is empty */
if (rpmpkgValidateZero(pkgdb, pkgdb->slotnpages * (PAGE_SIZE / BLK_SIZE), PAGE_SIZE / BLK_SIZE)) {
return RPMRC_FAIL;
}
if (rpmpkgWriteEmptySlotpage(pkgdb, pkgdb->slotnpages)) {
return RPMRC_FAIL;
}
/* announce free page */
pkgdb->freeslot = pkgdb->slotnpages * (PAGE_SIZE / SLOT_SIZE);
pkgdb->slotnpages++;
pkgdb->generation++;
if (rpmpkgWriteHeader(pkgdb)) {
return RPMRC_FAIL;
}
return RPMRC_OK;
}
static inline int is_correct_db(rpmpkgdb pkgdb)
{
struct stat stb1, stb2;
if (stat(pkgdb->filename, &stb1))
return 0;
if (fstat(pkgdb->fd, &stb2))
return 0;
return stb1.st_dev == stb2.st_dev && stb1.st_ino == stb1.st_ino;
}
static inline int reopen_db(rpmpkgdb pkgdb)
{
close(pkgdb->fd);
if ((pkgdb->fd = open(pkgdb->filename, pkgdb->flags, pkgdb->mode)) == -1) {
return RPMRC_FAIL;
}
return RPMRC_OK;
}
static int rpmpkgGetLock(rpmpkgdb pkgdb, int type)
{
if (!pkgdb->fd)
return RPMRC_FAIL;
for (;;) {
if (flock(pkgdb->fd, type)) {
return RPMRC_FAIL;
}
if (!is_correct_db(pkgdb)) {
if (reopen_db(pkgdb)) {
return RPMRC_FAIL;
}
continue;
}
break;
}
return RPMRC_OK;
}
int rpmpkgLock(rpmpkgdb pkgdb, int excl)
{
unsigned int *lockcntp = excl ? &pkgdb->locked_excl : &pkgdb->locked_shared;
if (excl && pkgdb->rdonly)
return RPMRC_FAIL;
if (*lockcntp > 0 || (!excl && pkgdb->locked_excl)) {
(*lockcntp)++;
return RPMRC_OK;
}
pkgdb->header_ok = 0;
if (rpmpkgGetLock(pkgdb, excl ? LOCK_EX : LOCK_SH)) {
return RPMRC_FAIL;
}
(*lockcntp)++;
return RPMRC_OK;
}
int rpmpkgUnlock(rpmpkgdb pkgdb, int excl)
{
unsigned int *lockcntp = excl ? &pkgdb->locked_excl : &pkgdb->locked_shared;
if (*lockcntp == 0) {
return RPMRC_FAIL;
}
if (*lockcntp > 1 || (!excl && pkgdb->locked_excl)) {
(*lockcntp)--;
return RPMRC_OK;
}
if (excl && pkgdb->locked_shared) {
/* excl -> shared switch */
if (rpmpkgGetLock(pkgdb, LOCK_SH)) {
return RPMRC_FAIL;
}
(*lockcntp)--;
return RPMRC_OK;
}
flock(pkgdb->fd, LOCK_UN);
(*lockcntp)--;
pkgdb->header_ok = 0;
return RPMRC_OK;
}
static int rpmpkgLockReadHeader(rpmpkgdb pkgdb, int excl)
{
if (rpmpkgLock(pkgdb, excl))
return RPMRC_FAIL;
if (rpmpkgReadHeader(pkgdb)) {
rpmpkgUnlock(pkgdb, excl);
return RPMRC_FAIL;
}
return RPMRC_OK;
}
static int rpmpkgInitInternal(rpmpkgdb pkgdb)
{
struct stat stb;
if (fstat(pkgdb->fd, &stb)) {
return RPMRC_FAIL;
}
if (stb.st_size == 0) {
if (rpmpkgWriteEmptySlotpage(pkgdb, 0)) {
return RPMRC_FAIL;
}
pkgdb->slotnpages = 1;
if (!pkgdb->nextpkgidx)
pkgdb->nextpkgidx = 1;
pkgdb->generation++;
if (rpmpkgWriteHeader(pkgdb)) {
return RPMRC_FAIL;
}
}
return RPMRC_OK;
}
static int rpmpkgInit(rpmpkgdb pkgdb)
{
int rc;
if (rpmpkgLock(pkgdb, 1))
return RPMRC_FAIL;
rc = rpmpkgInitInternal(pkgdb);
rpmpkgUnlock(pkgdb, 1);
return rc;
}
int rpmpkgOpen(rpmpkgdb *pkgdbp, const char *filename, int flags, int mode)
{
struct stat stb;
rpmpkgdb pkgdb;
*pkgdbp = 0;
pkgdb = calloc(1, sizeof(*pkgdb));
pkgdb->filename = strdup(filename);
if (!pkgdb->filename) {
free(pkgdb);
return RPMRC_FAIL;
}
if ((flags & (O_RDONLY|O_RDWR)) == O_RDONLY)
pkgdb->rdonly = 1;
if ((pkgdb->fd = open(filename, flags, mode)) == -1) {
return RPMRC_FAIL;
}
if (fstat(pkgdb->fd, &stb)) {
close(pkgdb->fd);
free(pkgdb);
return RPMRC_FAIL;
}
if (stb.st_size == 0) {
if (rpmpkgInit(pkgdb)) {
close(pkgdb->fd);
free(pkgdb);
return RPMRC_FAIL;
}
}
pkgdb->flags = flags;
pkgdb->mode = mode;
pkgdb->dofsync = 1;
*pkgdbp = pkgdb;
return RPMRC_OK;
}
void rpmpkgClose(rpmpkgdb pkgdb)
{
if (pkgdb->fd >= 0) {
close(pkgdb->fd);
pkgdb->fd = -1;
}
if (pkgdb->slots)
free(pkgdb->slots);
pkgdb->slots = 0;
if (pkgdb->slothash)
free(pkgdb->slothash);
pkgdb->slothash = 0;
free(pkgdb->filename);
free(pkgdb);
}
void rpmpkgSetFsync(rpmpkgdb pkgdb, int dofsync)
{
pkgdb->dofsync = dofsync;
}
static int rpmpkgGetInternal(rpmpkgdb pkgdb, unsigned int pkgidx, unsigned char **blobp, unsigned int *bloblp)
{
pkgslot *slot;
unsigned char *blob;
if (!pkgdb->slots && rpmpkgReadSlots(pkgdb)) {
return RPMRC_FAIL;
}
slot = rpmpkgFindSlot(pkgdb, pkgidx);
if (!slot) {
return RPMRC_NOTFOUND;
}
blob = malloc((size_t)slot->blkcnt * BLK_SIZE);
if (rpmpkgReadBlob(pkgdb, pkgidx, slot->blkoff, slot->blkcnt, blob, bloblp, (unsigned int *)0)) {
free(blob);
return RPMRC_FAIL;
}
*blobp = blob;
return RPMRC_OK;
}
static int rpmpkgPutInternal(rpmpkgdb pkgdb, unsigned int pkgidx, unsigned char *blob, unsigned int blobl)
{
unsigned int blkcnt, blkoff, slotno;
pkgslot *oldslot;
/* we always read all slots when writing, just in case */
if (rpmpkgReadSlots(pkgdb)) {
return RPMRC_FAIL;
}
blkcnt = (BLOBHEAD_SIZE + blobl + BLOBTAIL_SIZE + BLK_SIZE - 1) / BLK_SIZE;
/* find a nice place for the blob */
if (rpmpkgFindEmptyOffset(pkgdb, pkgidx, blkcnt, &blkoff, &oldslot, 0)) {
return RPMRC_FAIL;
}
/* create new slot page if we don't have a free slot and can't reuse an old one */
if (!oldslot && !pkgdb->freeslot) {
if (rpmpkgAddSlotPage(pkgdb)) {
return RPMRC_FAIL;
}
/* redo rpmpkgFindEmptyOffset to get another free area */
if (rpmpkgFindEmptyOffset(pkgdb, pkgidx, blkcnt, &blkoff, &oldslot, 0)) {
return RPMRC_FAIL;
}
}
/* make sure that we don't overwrite data */
if (rpmpkgValidateZero(pkgdb, blkoff, blkcnt)) {
return RPMRC_FAIL;
}
/* write new blob */
if (rpmpkgWriteBlob(pkgdb, pkgidx, blkoff, blkcnt, blob, blobl, (unsigned int)time(0))) {
return RPMRC_FAIL;
}
/* write slot */
slotno = oldslot ? oldslot->slotno : pkgdb->freeslot;
if (!slotno) {
return RPMRC_FAIL;
}
if (rpmpkgWriteslot(pkgdb, slotno, pkgidx, blkoff, blkcnt)) {
free(pkgdb->slots);
pkgdb->slots = 0;
return RPMRC_FAIL;
}
/* erase old blob */
if (oldslot && oldslot->blkoff) {
if (rpmpkgDelBlob(pkgdb, pkgidx, oldslot->blkoff, oldslot->blkcnt)) {
free(pkgdb->slots);
pkgdb->slots = 0;
return RPMRC_FAIL;
}
}
if (oldslot) {
/* just update the slot, no need to free the slot data */
oldslot->blkoff = blkoff;
oldslot->blkcnt = blkcnt;
} else {
free(pkgdb->slots);
pkgdb->slots = 0;
}
return RPMRC_OK;
}
static int rpmpkgDelInternal(rpmpkgdb pkgdb, unsigned int pkgidx)
{
pkgslot *slot;
unsigned int blkoff, blkcnt;
/* we always read all slots when writing, just in case */
if (rpmpkgReadSlots(pkgdb)) {
return RPMRC_FAIL;
}
rpmpkgOrderSlots(pkgdb, SLOTORDER_BLKOFF);
slot = rpmpkgFindSlot(pkgdb, pkgidx);
if (!slot) {
return RPMRC_OK;
}
if (rpmpkgWriteslot(pkgdb, slot->slotno, 0, 0, 0)) {
return RPMRC_FAIL;
}
if (rpmpkgDelBlob(pkgdb, pkgidx, slot->blkoff, slot->blkcnt)) {
return RPMRC_FAIL;
}
if (pkgdb->nslots > 1 && slot->blkoff < pkgdb->fileblks / 2) {
/* we freed a blob in the first half of our data. do some extra work */
int i;
if (slot == pkgdb->slots) {
blkoff = pkgdb->slotnpages * (PAGE_SIZE / BLK_SIZE);
} else {
blkoff = slot[-1].blkoff + slot[-1].blkcnt;
}
if (slot < pkgdb->slots + pkgdb->nslots - 1) {
blkcnt = slot[1].blkoff - blkoff;
} else {
blkcnt = slot->blkoff + slot->blkcnt - blkoff;
}
slot->blkoff = 0;
slot->blkcnt = 0;
slot = pkgdb->slots + pkgdb->nslots - 2;
if (slot->blkoff < slot[1].blkoff)
slot++; /* bigger slot first */
for (i = 0; i < 2; i++, slot++) {
if (slot == pkgdb->slots + pkgdb->nslots)
slot -= 2;
if (!slot->blkoff || slot->blkoff < blkoff)
continue;
if (slot->blkoff < pkgdb->fileblks / 2)
continue;
if (slot->blkcnt > blkcnt)
continue;
rpmpkgMoveBlob(pkgdb, slot, blkoff);
blkoff += slot->blkcnt;