ref: 94e26e7576fabcaacd8fa8f75c4f87f9eb6e56f3
dir: /sys/src/cmd/paqfs/mkpaqfs.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <flate.h>
#include <mp.h>
#include <libsec.h>
#include "paqfs.h"
enum {
OffsetSize = 4, /* size of block offset */
};
void paqfs(char *root, char *label);
PaqDir *paqFile(char *name, Dir *dir);
PaqDir *paqDir(char *name, Dir *dir);
PaqDir *paqDirAlloc(Dir *d, ulong offset);
void paqDirFree(PaqDir *pd);
void writeHeader(char *label);
void writeTrailer(ulong root);
ulong writeBlock(uchar *buf, int type);
void usage(void);
void outWrite(void *buf, int n);
int paqDirSize(PaqDir *dir);
void putDir(uchar *p, PaqDir *dir);
void putHeader(uchar *p, PaqHeader *h);
void putBlock(uchar *p, PaqBlock *h);
void putTrailer(uchar *p, PaqTrailer *t);
void putl(uchar *p, ulong v);
void puts(uchar *p, int x);
uchar *putstr(uchar *p, char *s);
void *emallocz(int size);
void warn(char *fmt, ...);
int uflag=0; /* uncompressed */
long blocksize = 4*1024;
Biobuf *out;
DigestState *outdg;
void
main(int argc, char *argv[])
{
char *s, *ss;
char *outfile = nil;
char *label = nil;
char *file;
ARGBEGIN {
case 'u':
uflag=1;
break;
case 'o':
outfile = ARGF();
break;
case 'l':
label = ARGF();
if(label == nil)
usage();
break;
case 'b':
s = ARGF();
if(s) {
blocksize = strtoul(s, &ss, 0);
if(s == ss)
usage();
if(*ss == 'k')
blocksize *= 1024;
}
if(blocksize < MinBlockSize)
sysfatal("blocksize too small: must be at least %d", MinBlockSize);
if(blocksize > MaxBlockSize)
sysfatal("blocksize too large: must be no greater than %d", MaxBlockSize);
break;
} ARGEND
if(outfile == nil) {
out = emallocz(sizeof(Biobuf));
Binit(out, 1, OWRITE);
} else {
out = Bopen(outfile, OWRITE|OTRUNC);
if(out == nil)
sysfatal("could not create file: %s: %r", outfile);
}
deflateinit();
file = argv[0];
if(file == nil)
file = ".";
if(label == nil) {
if(strrchr(file, '/'))
label = strrchr(file, '/') + 1;
else
label = file;
}
paqfs(file, label);
Bterm(out);
exits(0);
}
void
usage(void)
{
fprint(2, "usage: %s [-u] [-b blocksize] -o output [root]\n", argv0);
exits("usage");
}
void
paqfs(char *root, char *label)
{
Dir *dir;
PaqDir *pd;
ulong offset;
uchar *buf;
dir = dirstat(root);
if(dir == nil)
sysfatal("could not stat root: %s: %r", root);
writeHeader(label);
if(dir->mode & DMDIR)
pd = paqDir(root, dir);
else
pd = paqFile(root, dir);
buf = emallocz(blocksize);
putDir(buf, pd);
offset = writeBlock(buf, DirBlock);
writeTrailer(offset);
paqDirFree(pd);
free(dir);
}
PaqDir *
paqFile(char *name, Dir *dir)
{
int fd, n, nn, nb;
vlong tot;
uchar *block, *pointer;
ulong offset;
fd = open(name, OREAD);
if(fd < 0) {
warn("could not open file: %s: %r", name);
return nil;
}
block = emallocz(blocksize);
pointer = emallocz(blocksize);
nb = 0;
n = 0;
tot = 0;
for(;;) {
nn = read(fd, block+n, blocksize-n);
if(nn < 0) {
warn("read failed: %s: %r", name);
goto Err;
}
tot += nn;
if(nn == 0) {
if(n == 0)
break;
/* pad out last block */
memset(block+n, 0, blocksize-n);
nn = blocksize - n;
}
n += nn;
if(n < blocksize)
continue;
if(nb >= blocksize/OffsetSize) {
warn("file too big for blocksize: %s", name);
goto Err;
}
offset = writeBlock(block, DataBlock);
putl(pointer+nb*OffsetSize, offset);
nb++;
n = 0;
}
offset = writeBlock(pointer, PointerBlock);
close(fd);
free(pointer);
free(block);
dir->length = tot;
return paqDirAlloc(dir, offset);
Err:
close(fd);
free(pointer);
free(block);
return nil;
}
PaqDir *
paqDir(char *name, Dir *dir)
{
Dir *dirs, *p;
PaqDir *pd;
int i, n, nb, fd, ndir;
uchar *block, *pointer;
char *nname;
ulong offset;
fd = open(name, OREAD);
if(fd < 0) {
warn("could not open directory: %s: %r", name);
return nil;
}
ndir = dirreadall(fd, &dirs);
close(fd);
if(ndir < 0) {
warn("could not read directory: %s: %r", name);
return nil;
}
block = emallocz(blocksize);
pointer = emallocz(blocksize);
nb = 0;
n = 0;
nname = nil;
pd = nil;
for(i=0; i<ndir; i++) {
p = dirs + i;
free(nname);
nname = emallocz(strlen(name) + strlen(p->name) + 2);
sprint(nname, "%s/%s", name, p->name);
if(p->mode & DMDIR)
pd = paqDir(nname, p);
else
pd = paqFile(nname, p);
if(pd == nil)
continue;
if(n+paqDirSize(pd) >= blocksize) {
/* zero fill the block */
memset(block+n, 0, blocksize-n);
offset = writeBlock(block, DirBlock);
n = 0;
if(nb >= blocksize/OffsetSize) {
warn("directory too big for blocksize: %s", nname);
goto Err;
}
putl(pointer+nb*OffsetSize, offset);
nb++;
}
if(n+paqDirSize(pd) >= blocksize) {
warn("directory entry does not fit in a block: %s", nname);
paqDirFree(pd);
continue;
}
putDir(block+n, pd);
n += paqDirSize(pd);
paqDirFree(pd);
pd = nil;
}
if(n > 0) {
/* zero fill the block */
memset(block+n, 0, blocksize-n);
offset = writeBlock(block, DirBlock);
if(nb >= blocksize/OffsetSize) {
warn("directory too big for blocksize: %s", nname);
goto Err;
}
putl(pointer+nb*OffsetSize, offset);
}
offset = writeBlock(pointer, PointerBlock);
free(nname);
free(dirs);
paqDirFree(pd);
free(block);
free(pointer);
return paqDirAlloc(dir, offset);
Err:
free(nname);
free(dirs);
paqDirFree(pd);
free(block);
free(pointer);
return nil;
}
PaqDir *
paqDirAlloc(Dir *dir, ulong offset)
{
PaqDir *pd;
static ulong qid = 1;
pd = emallocz(sizeof(PaqDir));
pd->name = strdup(dir->name);
pd->qid = qid++;
pd->mode = dir->mode & (DMDIR|DMAPPEND|0777);
pd->mtime = dir->mtime;
pd->length = dir->length;
pd->uid = strdup(dir->uid);
pd->gid = strdup(dir->gid);
pd->offset = offset;
return pd;
}
void
paqDirFree(PaqDir *pd)
{
if(pd == nil)
return;
free(pd->name);
free(pd->uid);
free(pd->gid);
free(pd);
}
void
writeHeader(char *label)
{
PaqHeader hdr;
uchar buf[HeaderSize];
memset(&hdr, 0, sizeof(hdr));
hdr.magic = HeaderMagic;
hdr.version = Version;
hdr.blocksize = blocksize;
hdr.time = time(nil);
strncpy(hdr.label, label, sizeof(hdr.label));
hdr.label[sizeof(hdr.label)-1] = 0;
putHeader(buf, &hdr);
outWrite(buf, sizeof(buf));
}
void
writeTrailer(ulong root)
{
PaqTrailer tlr;
uchar buf[TrailerSize];
memset(&tlr, 0, sizeof(tlr));
tlr.magic = TrailerMagic;
tlr.root = root;
putTrailer(buf, &tlr);
outWrite(buf, sizeof(buf));
}
ulong
writeBlock(uchar *b, int type)
{
uchar *cb, *ob;
int n;
PaqBlock bh;
uchar buf[BlockSize];
ulong offset;
offset = Boffset(out);
bh.magic = BlockMagic;
bh.size = blocksize;
bh.type = type;
bh.encoding = NoEnc;
bh.adler32 = adler32(0, b, blocksize);
ob = b;
if(!uflag) {
cb = emallocz(blocksize);
n = deflateblock(cb, blocksize, b, blocksize, 6, 0);
if(n > 0 && n < blocksize) {
bh.encoding = DeflateEnc;
bh.size = n;
ob = cb;
}
}
putBlock(buf, &bh);
outWrite(buf, sizeof(buf));
outWrite(ob, bh.size);
if(ob != b)
free(ob);
return offset;
}
void
outWrite(void *buf, int n)
{
if(Bwrite(out, buf, n) < n)
sysfatal("write failed: %r");
outdg = sha1((uchar*)buf, n, nil, outdg);
}
int
paqDirSize(PaqDir *d)
{
return MinDirSize + strlen(d->name) + strlen(d->uid) + strlen(d->gid);
}
void
putHeader(uchar *p, PaqHeader *h)
{
if(h->blocksize < 65536){
putl(p, h->magic);
puts(p+4, h->version);
puts(p+6, h->blocksize);
}else{
assert(h->magic == HeaderMagic);
puts(p, BigHeaderMagic);
puts(p+2, h->version);
putl(p+4, h->blocksize);
}
putl(p+8, h->time);
memmove(p+12, h->label, sizeof(h->label));
}
void
putTrailer(uchar *p, PaqTrailer *h)
{
putl(p, h->magic);
putl(p+4, h->root);
outdg = sha1(p, 8, p+8, outdg);
}
void
putBlock(uchar *p, PaqBlock *b)
{
if(b->size < 65536){
putl(p, b->magic);
puts(p+4, b->size);
}else{
assert(b->magic == BlockMagic);
puts(p, BigBlockMagic);
putl(p+2, b->size);
}
p[6] = b->type;
p[7] = b->encoding;
putl(p+8, b->adler32);
}
void
putDir(uchar *p, PaqDir *d)
{
uchar *q;
puts(p, paqDirSize(d));
putl(p+2, d->qid);
putl(p+6, d->mode);
putl(p+10, d->mtime);
putl(p+14, d->length);
putl(p+18, d->offset);
q = putstr(p+22, d->name);
q = putstr(q, d->uid);
q = putstr(q, d->gid);
assert(q-p == paqDirSize(d));
}
void
putl(uchar *p, ulong v)
{
p[0] = v>>24;
p[1] = v>>16;
p[2] = v>>8;
p[3] = v;
}
void
puts(uchar *p, int v)
{
assert(v < (1<<16));
p[0] = v>>8;
p[1] = v;
}
uchar *
putstr(uchar *p, char *s)
{
int n = strlen(s);
puts(p, n+2);
memmove(p+2, s, n);
return p+2+n;
}
void *
emallocz(int size)
{
void *p;
p = malloc(size);
if(p == nil)
sysfatal("malloc failed");
memset(p, 0, size);
return p;
}
void
warn(char *fmt, ...)
{
char buf[1024];
va_list arg;
va_start(arg, fmt);
vseprint(buf, buf+sizeof(buf), fmt, arg);
va_end(arg);
fprint(2, "%s: %s\n", argv0, buf);
}