#pragma prototyped

#include <paxlib.h>

#include <codex.h>

#include <swap.h>

#include <tm.h>

#define MAGIC 0xea60

#define SUM "sum-crc-0xedb88320-init-done"

typedef struct Ar_s

{

Codexdisc_t codexdisc;

Pax_t* pax;

Paxarchive_t* ap;

Sfio_t* sum;

char method[64];

unsigned int index;

unsigned long checksum;

unsigned char system;

unsigned char type;

} Ar_t;

static int

arj_done(Pax_t* pax, register Paxarchive_t* ap)

{

register Ar_t* ar = (Ar_t*)ap->data;

if (!ar)

return -1;

if (ar->sum)

sfdisc(ar->sum, SF_POPDISC);

free(ar);

ap->data = 0;

return 0;

}

static int

arj_getprologue(Pax_t* pax, Paxformat_t* fp, register Paxarchive_t* ap, Paxfile_t* f, unsigned char* buf, size_t size)

{

register Ar_t* ar;

register char* s;

int n;

int r;

uint32_t checksum;

Codexdata_t sum;

if (size < 4 || swapget(3, buf, 2) != MAGIC || size < ((n = swapget(3, buf+2, 2)) + 8) || n > 2600)

return 0;

if (!(ar = newof(0, Ar_t, 1, 0)))

return paxnospace(pax);

ar->pax = pax;

ar->ap = ap;

ap->data = ar;

codexinit(&ar->codexdisc, pax->errorf);

r = -1;

if (!(ar->sum = codexnull()) || codex(ar->sum, NiL, SUM, 0, &ar->codexdisc, NiL) <= 0)

{

ar->sum = 0;

goto bad;

}

sfwrite(ar->sum, buf + 4, n);

codexdata(ar->sum, &sum);

checksum = swapget(3, buf + 4 + n, 4);

if (checksum != sum.num)

{

r = 0;

goto bad;

}

if (paxseek(pax, ap, n + 8, SEEK_SET, 0) < 0)

goto bad;

while ((s = paxget(pax, ap, 2, NiL)) && (n = swapget(3, s, 2)))

if (paxseek(pax, ap, n + 2, SEEK_CUR, 0) < 0)

goto bad;

return 1;

bad:

arj_done(pax, ap);

return r;

}

static int

arj_getheader(Pax_t* pax, register Paxarchive_t* ap, register Paxfile_t* f)

{

register Ar_t* ar = (Ar_t*)ap->data;

register unsigned char* buf;

char* s;

Tm_t tm;

unsigned long dostime;

long n;

int mode;

uint32_t checksum;

Codexdata_t sum;

for (;;)

{

if (!(buf = (unsigned char*)paxget(pax, ap, -4, NiL)) || !(n = swapget(3, buf+2, 2)))

return 0;

if (n < 32 || n > 2600 || swapget(3, buf, 2) != MAGIC || !(buf = (unsigned char*)paxget(pax, ap, n + 4, NiL)))

break;

sfsync(ar->sum);

sfwrite(ar->sum, buf, n);

codexdata(ar->sum, &sum);

checksum = swapget(3, buf + n, 4);

if (checksum != sum.num)

break;

ar->system = buf[3];

ar->type = buf[4];

dostime = swapget(3, buf+8, 4);

f->st->st_size = swapget(3, buf+12, 4);

f->uncompressed = swapget(3, buf+16, 4);

switch (ar->index = buf[5])

{

case 0:

sfsprintf(ar->method, sizeof(ar->method), "copy|%s", SUM);

break;

case 1:

case 2:

case 3:

sfsprintf(ar->method, sizeof(ar->method), "lzh-26624-s1+SIZE=%I*u|%s", sizeof(f->uncompressed), f->uncompressed, SUM);

break;

default:

*ar->method = 0;

break;

}

ar->checksum = swapget(3, buf+20, 4);

mode = swapget(3, buf+26, 2);

s = (char*)buf + buf[0];

f->name = paxstash(pax, &ap->stash.head, NiL, strlen(s) + 1);

strcpy(f->name, s);

while ((s = paxget(pax, ap, 2, NiL)) && (n = swapget(3, s, 2)))

if (paxseek(pax, ap, n + 4, SEEK_CUR, 0) < 0)

goto bad;

f->linkpath = 0;

f->st->st_dev = 0;

f->st->st_ino = 0;

if (ar->system != 3)

{

if (mode & 0x10)

mode = X_IFDIR|X_IRUSR|X_IWUSR|X_IXUSR|X_IRGRP|X_IWGRP|X_IXGRP|X_IROTH|X_IWOTH|X_IXOTH;

else if (mode & 0x01)

mode = X_IFREG|X_IRUSR|X_IRGRP|X_IROTH;

else

{

mode = X_IFREG|X_IRUSR|X_IWUSR|X_IRGRP|X_IWGRP|X_IROTH|X_IWOTH;

if ((s = strrchr(f->name, '.')) && (s[1]=='e' || s[1]=='E') && (s[1]=='x' || s[1]=='X') && (s[1]=='e' || s[1]=='E'))

mode |= X_IXUSR|X_IXGRP|X_IXOTH;

}

}

f->st->st_mode = mode & pax->modemask;

f->st->st_uid = pax->uid;

f->st->st_gid = pax->gid;

f->st->st_nlink = 1;

IDEVICE(f->st, 0);

memset(&tm, 0, sizeof(tm));

tm.tm_year = ((dostime >> (16+9)) & 0x7f) + 80;

tm.tm_mon = ((dostime >> (16+5)) & 0x0f) - 1;

tm.tm_mday = ((dostime >> (16+0)) & 0x1f);

tm.tm_hour = ((dostime >> 11) & 0x1f);

tm.tm_min = ((dostime >> 5) & 0x3f);

tm.tm_sec = ((dostime ) & 0x1f) * 2;

f->st->st_mtime = f->st->st_ctime = f->st->st_atime = tmtime(&tm, TM_LOCALZONE);

return 1;

}

bad:

return paxcorrupt(pax, ap, f, NiL);

}

static int

arj_getdata(Pax_t* pax, register Paxarchive_t* ap, register Paxfile_t* f, int fd)

{

register Ar_t* ar = (Ar_t*)ap->data;

Sfio_t* sp;

off_t pos;

ssize_t n;

int r;

int pop;

Codexdata_t sum;

if (!(n = f->st->st_size))

return 1;

pos = paxseek(pax, ap, 0, SEEK_CUR, 0) + f->st->st_size;

r = -1;

if (fd < 0)

r = 1;

else if (sp = paxpart(pax, ap, f->st->st_size))

{

if (!*ar->method || (pop = codex(sp, NiL, ar->method, 0, &ar->codexdisc, NiL)) < 0)

(*pax->errorf)(NiL, pax, 2, "%s: %s: cannot decode method %d", ap->name, f->name, ar->index);

else

{

for (;;)

{

if ((n = sfread(sp, pax->buf, sizeof(pax->buf))) < 0)

{

(*pax->errorf)(NiL, pax, 2, "%s: %s: unexpected EOF", ap->name, f->name);

break;

}

else if (n == 0)

{

if (codexdata(sp, &sum) <= 0)

(*pax->errorf)(NiL, pax, 2, "%s: %s: checksum discipline error", ap->name, f->name);

else if (!paxchecksum(pax, ap, f, ar->checksum, sum.num))

r = 1;

break;

}

if (paxdata(pax, ap, f, fd, pax->buf, n))

break;

}

codexpop(sp, NiL, pop);

}

}

if (paxseek(pax, ap, pos, SEEK_SET, 0) != pos)

{

(*pax->errorf)(NiL, pax, 2, "%s: %s: cannot seek past %s format data", ap->name, f->name, ap->format->name);

r = -1;

}

return r;

}

Paxformat_t pax_arj_format =

{

"arj",

0,

"arj archive",

0,

PAX_ARCHIVE|PAX_DOS|PAX_NOHARDLINKS|PAX_IN,

PAX_DEFBUFFER,

PAX_DEFBLOCKS,

0,

PAXNEXT(arj),

0,

arj_done,

arj_getprologue,

arj_getheader,

arj_getdata,

};

PAXLIB(arj)