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header.c
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/* ------------------------------------------------------------------------ */
/* LHa for UNIX */
/* header.c -- header manipulate functions */
/* */
/* Modified Nobutaka Watazaki */
/* */
/* Original Y.Tagawa */
/* modified 1991.12.16 M.Oki */
/* Ver. 1.10 Symbolic Link added 1993.10.01 N.Watazaki */
/* Ver. 1.13b Symbolic Link Bug Fix 1994.08.22 N.Watazaki */
/* Ver. 1.14 Source All chagned 1995.01.14 N.Watazaki */
/* Ver. 1.14i bug fixed 2000.10.06 t.okamoto */
/* Ver. 1.14i Contributed UTF-8 convertion for Mac OS X */
/* 2002.06.29 Hiroto Sakai */
/* Ver. 1.14i autoconfiscated & rewritten 2003.02.23 Koji Arai */
/* ------------------------------------------------------------------------ */
#include "lha.h"
#define DUMP_HEADER 1 /* for debugging */
#if !STRCHR_8BIT_CLEAN
/* should use 8 bit clean version */
#undef strchr
#undef strrchr
#define strchr xstrchr
#define strrchr xstrrchr
#endif
static char *get_ptr;
static char *start_ptr;
static off_t storage_size;
#define setup_get(PTR, SIZE) (start_ptr = get_ptr = (PTR), storage_size = (SIZE))
#if DUMP_HEADER
#define get_byte() dump_get_byte()
#define skip_bytes(len) dump_skip_bytes(len)
#else
#define get_byte() _get_byte()
#define skip_bytes(len) _skip_bytes(len)
#endif
#define put_ptr get_ptr
#define setup_put(PTR) (put_ptr = (PTR))
#define put_byte(c) (*put_ptr++ = (char)(c))
int optional_archive_kanji_code = NONE;
int optional_system_kanji_code = NONE;
char *optional_archive_delim = NULL;
char *optional_system_delim = NULL;
int optional_filename_case = NONE;
#ifdef MULTIBYTE_FILENAME
int default_system_kanji_code = MULTIBYTE_FILENAME;
#else
int default_system_kanji_code = NONE;
#endif
int
calc_sum(p, len)
void *p;
int len;
{
int sum = 0;
unsigned char *pc = (unsigned char*)p;
while (len--) sum += *pc++;
return sum & 0xff;
}
static void
_skip_bytes(len)
int len;
{
if (len < 0) {
error("Invalid header: %d", len);
exit(1);
}
get_ptr += len;
}
static int
_get_byte()
{
if (get_ptr < start_ptr || get_ptr - start_ptr >= storage_size) {
error("Invalid header");
exit(1);
}
return (*get_ptr++ & 0xff);
}
#if DUMP_HEADER
static int
dump_get_byte()
{
int c;
if (verbose_listing && verbose > 1)
printf("%02d %2d: ", get_ptr - start_ptr, 1);
c = _get_byte();
if (verbose_listing && verbose > 1) {
if (isprint(c))
printf("%d(0x%02x) '%c'\n", c, c, c);
else
printf("%d(0x%02x)\n", c, c);
}
return c;
}
static void
dump_skip_bytes(len)
int len;
{
if (len == 0) return;
if (verbose_listing && verbose > 1) {
printf("%02d %2d: ", get_ptr - start_ptr, len);
if (len < 0) {
error("Invalid header: %d", len);
exit(1);
}
while (len--)
printf("0x%02x ", _get_byte());
printf("... ignored\n");
}
else
_skip_bytes(len);
}
#endif
static int
get_word()
{
int b0, b1;
int w;
#if DUMP_HEADER
if (verbose_listing && verbose > 1)
printf("%02d %2d: ", get_ptr - start_ptr, 2);
#endif
b0 = _get_byte();
b1 = _get_byte();
w = (b1 << 8) + b0;
#if DUMP_HEADER
if (verbose_listing && verbose > 1)
printf("%d(0x%04x)\n", w, w);
#endif
return w;
}
static void
put_word(v)
unsigned int v;
{
put_byte(v);
put_byte(v >> 8);
}
static long
get_longword()
{
long b0, b1, b2, b3;
long l;
#if DUMP_HEADER
if (verbose_listing && verbose > 1)
printf("%02d %2d: ", get_ptr - start_ptr, 4);
#endif
b0 = _get_byte();
b1 = _get_byte();
b2 = _get_byte();
b3 = _get_byte();
l = (b3 << 24) + (b2 << 16) + (b1 << 8) + b0;
#if DUMP_HEADER
if (verbose_listing && verbose > 1)
printf("%ld(0x%08lx)\n", l, l);
#endif
return l;
}
static void
put_longword(long v)
{
put_byte(v);
put_byte(v >> 8);
put_byte(v >> 16);
put_byte(v >> 24);
}
#ifdef HAVE_UINT64_T
static uint64_t
get_longlongword()
{
uint64_t b0, b1, b2, b3, b4, b5, b6, b7;
uint64_t l;
#if DUMP_HEADER
if (verbose_listing && verbose > 1)
printf("%02d %2d: ", get_ptr - start_ptr, 4);
#endif
b0 = _get_byte();
b1 = _get_byte();
b2 = _get_byte();
b3 = _get_byte();
b4 = _get_byte();
b5 = _get_byte();
b6 = _get_byte();
b7 = _get_byte();
l = (b7 << 24) + (b6 << 16) + (b5 << 8) + b4;
l <<= 32;
l |= (b3 << 24) + (b2 << 16) + (b1 << 8) + b0;
#if DUMP_HEADER
if (verbose_listing && verbose > 1)
printf("%lld(%#016llx)\n", l, l);
#endif
return l;
}
static void
put_longlongword(uint64_t v)
{
put_byte(v);
put_byte(v >> 8);
put_byte(v >> 16);
put_byte(v >> 24);
put_byte(v >> 32);
put_byte(v >> 40);
put_byte(v >> 48);
put_byte(v >> 56);
}
#endif
static int
get_bytes(buf, len, size)
char *buf;
int len, size;
{
int i;
#if DUMP_HEADER
if (verbose_listing && verbose > 1)
printf("%02d %2d: \"", get_ptr - start_ptr, len);
if (len < 0) {
error("Invalid header: %d", len);
exit(1);
}
for (i = 0; i < len && i < size; i++) {
buf[i] = get_ptr[i];
if (verbose_listing && verbose > 1) {
if (isprint(buf[i]))
printf("%c", buf[i]);
else
printf("\\x%02x", (unsigned char)buf[i]);
}
}
if (verbose_listing && verbose > 1)
printf("\"\n");
#else
if (len < 0) {
error("Invalid header: %d", len);
exit(1);
}
for (i = 0; i < len && i < size; i++)
buf[i] = get_ptr[i];
#endif
get_ptr += len;
return i;
}
static void
put_bytes(buf, len)
char *buf;
int len;
{
int i;
for (i = 0; i < len; i++)
put_byte(buf[i]);
}
void
convert_filename(name, len, size,
from_code, to_code,
from_delim, to_delim,
case_to)
char *name;
int len; /* length of name */
int size; /* size of name buffer */
int from_code, to_code, case_to;
char *from_delim, *to_delim;
{
int i;
#ifdef MULTIBYTE_FILENAME
char tmp[FILENAME_LENGTH];
int to_code_save = NONE;
if (from_code == CODE_CAP) {
len = cap_to_sjis(tmp, name, sizeof(tmp));
strncpy(name, tmp, size);
name[size-1] = 0;
len = strlen(name);
from_code = CODE_SJIS;
}
if (to_code == CODE_CAP) {
to_code_save = CODE_CAP;
to_code = CODE_SJIS;
}
#endif
/* special case: if `name' has small lettter, not convert case. */
if (from_code == CODE_SJIS && case_to == TO_LOWER) {
for (i = 0; i < len; i++) {
#ifdef MULTIBYTE_FILENAME
if (SJIS_FIRST_P(name[i]) && SJIS_SECOND_P(name[i+1]))
i++;
else
#endif
if (islower(name[i])) {
case_to = NONE;
break;
}
}
}
#ifdef MULTIBYTE_FILENAME
if ((from_code == CODE_SJIS || from_code == CODE_EUC) && to_code == CODE_UTF8) {
for (i = 0; i < len; i++) {
if (from_code == CODE_SJIS && (SJIS_FIRST_P(name[i]) && SJIS_SECOND_P(name[i+1])))
i++;
else {
/* FIXME: provisionally fix for the Mac OS CoreFoundation */
if (strchr(from_delim, name[i]))
name[i] = '/';
}
}
conv_to_utf8(tmp, name, sizeof(tmp), from_code);
strncpy(name, tmp, size);
name[size-1] = 0;
len = strlen(name);
for (i = 0; i < len; i++)
if (name[i] == '/') name[i] = LHA_PATHSEP;
from_code = CODE_UTF8;
}
else if (from_code == CODE_UTF8 && (to_code == CODE_SJIS || to_code == CODE_EUC)) {
for (i = 0; i < len; i++)
/* FIXME: provisionally fix for the Mac OS CoreFoundation */
if ((unsigned char)name[i] == LHA_PATHSEP) name[i] = '/';
conv_from_utf8(tmp, name, sizeof(tmp), to_code);
strncpy(name, tmp, size);
name[size-1] = 0;
len = strlen(name);
for (i = 0; i < len; i++)
if (name[i] == '/') name[i] = LHA_PATHSEP;
from_code = to_code;
}
#endif
for (i = 0; i < len; i ++) {
#ifdef MULTIBYTE_FILENAME
if (from_code == CODE_EUC &&
(unsigned char)name[i] == 0x8e) {
if (to_code != CODE_SJIS) {
i++;
continue;
}
/* X0201 KANA */
memmove(name + i, name + i + 1, len - i);
len--;
continue;
}
if (from_code == CODE_SJIS && X0201_KANA_P(name[i])) {
if (to_code != CODE_EUC) {
continue;
}
if (len == size - 1) /* check overflow */
len--;
memmove(name+i+1, name+i, len-i);
name[i] = 0x8e;
i++;
len++;
continue;
}
if (from_code == CODE_EUC && (unsigned char)name[i] != LHA_PATHSEP &&
(name[i] & 0x80) && (name[i+1] & 0x80)) {
int c1, c2;
if (to_code != CODE_SJIS) {
i++;
continue;
}
c1 = (unsigned char)name[i];
c2 = (unsigned char)name[i+1];
euc2sjis(&c1, &c2);
name[i] = c1;
name[i+1] = c2;
i++;
continue;
}
if (from_code == CODE_SJIS &&
SJIS_FIRST_P(name[i]) &&
SJIS_SECOND_P(name[i+1])) {
int c1, c2;
if (to_code != CODE_EUC) {
i++;
continue;
}
c1 = (unsigned char)name[i];
c2 = (unsigned char)name[i+1];
sjis2euc(&c1, &c2);
name[i] = c1;
name[i+1] = c2;
i++;
continue;
}
#endif /* MULTIBYTE_FILENAME */
{
char *ptr;
/* transpose from_delim to to_delim */
if ((ptr = strchr(from_delim, name[i])) != NULL) {
name[i] = to_delim[ptr - from_delim];
continue;
}
}
if (case_to == TO_UPPER && islower(name[i])) {
name[i] = toupper(name[i]);
continue;
}
if (case_to == TO_LOWER && isupper(name[i])) {
name[i] = tolower(name[i]);
continue;
}
}
#ifdef MULTIBYTE_FILENAME
if (to_code_save == CODE_CAP) {
len = sjis_to_cap(tmp, name, sizeof(tmp));
strncpy(name, tmp, size);
name[size-1] = 0;
len = strlen(name);
}
#endif /* MULTIBYTE_FILENAME */
}
/*
* Generic (MS-DOS style) time stamp format (localtime):
*
* 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
* |<---- year-1980 --->|<- month ->|<--- day ---->|
*
* 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
* |<--- hour --->|<---- minute --->|<- second/2 ->|
*
*/
static time_t
generic_to_unix_stamp(t)
long t;
{
struct tm tm;
#define subbits(n, off, len) (((n) >> (off)) & ((1 << (len))-1))
tm.tm_sec = subbits(t, 0, 5) * 2;
tm.tm_min = subbits(t, 5, 6);
tm.tm_hour = subbits(t, 11, 5);
tm.tm_mday = subbits(t, 16, 5);
tm.tm_mon = subbits(t, 21, 4) - 1;
tm.tm_year = subbits(t, 25, 7) + 80;
tm.tm_isdst = -1;
#if HAVE_MKTIME
return mktime(&tm);
#else
return timelocal(&tm);
#endif
}
static long
unix_to_generic_stamp(t)
time_t t;
{
struct tm *tm = localtime(&t);
tm->tm_year -= 80;
tm->tm_mon += 1;
return ((long)(tm->tm_year << 25) +
(tm->tm_mon << 21) +
(tm->tm_mday << 16) +
(tm->tm_hour << 11) +
(tm->tm_min << 5) +
(tm->tm_sec / 2));
}
static unsigned long
wintime_to_unix_stamp()
{
#if HAVE_UINT64_T
uint64_t t;
uint64_t epoch = ((uint64_t)0x019db1de << 32) + 0xd53e8000;
/* 0x019db1ded53e8000ULL: 1970-01-01 00:00:00 (UTC) */
t = (unsigned long)get_longword();
t |= (uint64_t)(unsigned long)get_longword() << 32;
t = (t - epoch) / 10000000;
return t;
#else
int i, borrow;
unsigned long t, q, x;
unsigned long wintime[8];
unsigned long epoch[8] = {0x01,0x9d,0xb1,0xde, 0xd5,0x3e,0x80,0x00};
/* 1970-01-01 00:00:00 (UTC) */
/* wintime -= epoch */
borrow = 0;
for (i = 7; i >= 0; i--) {
wintime[i] = (unsigned)get_byte() - epoch[i] - borrow;
borrow = (wintime[i] > 0xff) ? 1 : 0;
wintime[i] &= 0xff;
}
/* q = wintime / 10000000 */
t = q = 0;
x = 10000000; /* x: 24bit */
for (i = 0; i < 8; i++) {
t = (t << 8) + wintime[i]; /* 24bit + 8bit. t must be 32bit variable */
q <<= 8; /* q must be 32bit (time_t) */
q += t / x;
t %= x; /* 24bit */
}
return q;
#endif
}
/*
* extended header
*
* size field name
* --------------------------------
* base header: :
* 2 or 4 next-header size [*1]
* --------------------------------------
* ext header: 1 ext-type ^
* ? contents | [*1] next-header size
* 2 or 4 next-header size v
* --------------------------------------
*
* on level 1, 2 header:
* size field is 2 bytes
* on level 3 header:
* size field is 4 bytes
*/
static ssize_t
get_extended_header(fp, hdr, header_size, hcrc)
FILE *fp;
LzHeader *hdr;
size_t header_size;
unsigned int *hcrc;
{
char data[LZHEADER_STORAGE];
int name_length;
char dirname[FILENAME_LENGTH];
int dir_length = 0;
int i;
ssize_t whole_size = header_size;
int ext_type;
int n = 1 + hdr->size_field_length; /* `ext-type' + `next-header size' */
if (hdr->header_level == 0)
return 0;
name_length = strlen(hdr->name);
while (header_size) {
#if DUMP_HEADER
if (verbose_listing && verbose > 1)
printf("---\n");
#endif
setup_get(data, sizeof(data));
if (sizeof(data) < header_size) {
error("header size (%ld) too large.", header_size);
exit(1);
}
if (fread(data, header_size, 1, fp) == 0) {
error("Invalid header (LHa file ?)");
return -1;
}
ext_type = get_byte();
switch (ext_type) {
case 0:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < header crc >\n");
#endif
/* header crc (CRC-16) */
hdr->header_crc = get_word();
/* clear buffer for CRC calculation. */
data[1] = data[2] = 0;
skip_bytes(header_size - n - 2);
break;
case 1:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < filename >\n");
#endif
/* filename */
name_length =
get_bytes(hdr->name, header_size-n, sizeof(hdr->name)-1);
hdr->name[name_length] = 0;
break;
case 2:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < directory >\n");
#endif
/* directory */
dir_length = get_bytes(dirname, header_size-n, sizeof(dirname)-1);
dirname[dir_length] = 0;
break;
case 0x40:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < MS-DOS attribute >\n");
#endif
/* MS-DOS attribute */
hdr->attribute = get_word();
break;
case 0x41:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < Windows time stamp (FILETIME) >\n");
#endif
/* Windows time stamp (FILETIME structure) */
/* it is time in 100 nano seconds since 1601-01-01 00:00:00 */
skip_bytes(8); /* create time is ignored */
/* set last modified time */
if (hdr->header_level >= 2)
skip_bytes(8); /* time_t has been already set */
else
hdr->unix_last_modified_stamp = wintime_to_unix_stamp();
skip_bytes(8); /* last access time is ignored */
break;
case 0x42:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < 64bits file size header >\n");
#endif
#ifdef HAVE_UINT64_T
/* 64bits file size header (UNLHA32 extension) */
hdr->packed_size = get_longlongword();
hdr->original_size = get_longlongword();
#else
skip_bytes(8);
skip_bytes(8);
#endif
break;
case 0x50:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < UNIX permission >\n");
#endif
/* UNIX permission */
hdr->unix_mode = get_word();
break;
case 0x51:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < UNIX gid and uid >\n");
#endif
/* UNIX gid and uid */
hdr->unix_gid = get_word();
hdr->unix_uid = get_word();
break;
case 0x52:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < UNIX group name >\n");
#endif
/* UNIX group name */
i = get_bytes(hdr->group, header_size-n, sizeof(hdr->group)-1);
hdr->group[i] = '\0';
break;
case 0x53:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < UNIX user name >\n");
#endif
/* UNIX user name */
i = get_bytes(hdr->user, header_size-n, sizeof(hdr->user)-1);
hdr->user[i] = '\0';
break;
case 0x54:
#if DUMP_HEADER
if (verbose_listing && verbose > 1) printf(" < UNIX last modifed time (time_t) >\n");
#endif
/* UNIX last modified time */
hdr->unix_last_modified_stamp = (time_t) get_longword();
break;
default:
/* other headers */
/* 0x39: multi-disk header
0x3f: uncompressed comment
0x42: 64bit large file size
0x48-0x4f(?): reserved for authenticity verification
0x7d: encapsulation
0x7e: extended attribute - platform information
0x7f: extended attribute - permission, owner-id and timestamp
(level 3 on OS/2)
0xc4: compressed comment (dict size: 4096)
0xc5: compressed comment (dict size: 8192)
0xc6: compressed comment (dict size: 16384)
0xc7: compressed comment (dict size: 32768)
0xc8: compressed comment (dict size: 65536)
0xd0-0xdf(?): operating systemm specific information
0xfc: encapsulation (another opinion)
0xfe: extended attribute - platform information(another opinion)
0xff: extended attribute - permission, owner-id and timestamp
(level 3 on UNLHA32) */
if (verbose)
warning("unknown extended header 0x%02x", ext_type);
skip_bytes(header_size - n);
break;
}
if (hcrc)
*hcrc = calccrc(*hcrc, data, header_size);
if (hdr->size_field_length == 2)
whole_size += header_size = get_word();
else
whole_size += header_size = get_longword();
}
/* concatenate dirname and filename */
if (dir_length) {
if (name_length + dir_length >= sizeof(hdr->name)) {
warning("the length of pathname \"%s%s\" is too long.",
dirname, hdr->name);
name_length = sizeof(hdr->name) - dir_length - 1;
hdr->name[name_length] = 0;
}
strcat(dirname, hdr->name); /* ok */
strcpy(hdr->name, dirname); /* ok */
name_length += dir_length;
}
return whole_size;
}
#define I_HEADER_SIZE 0 /* level 0,1,2 */
#define I_HEADER_CHECKSUM 1 /* level 0,1 */
#define I_METHOD 2 /* level 0,1,2,3 */
#define I_PACKED_SIZE 7 /* level 0,1,2,3 */
#define I_ATTRIBUTE 19 /* level 0,1,2,3 */
#define I_HEADER_LEVEL 20 /* level 0,1,2,3 */
#define COMMON_HEADER_SIZE 21 /* size of common part */
#define I_GENERIC_HEADER_SIZE 24 /* + name_length */
#define I_LEVEL0_HEADER_SIZE 36 /* + name_length (unix extended) */
#define I_LEVEL1_HEADER_SIZE 27 /* + name_length */
#define I_LEVEL2_HEADER_SIZE 26 /* + padding */
#define I_LEVEL3_HEADER_SIZE 32
/*
* level 0 header
*
*
* offset size field name
* ----------------------------------
* 0 1 header size [*1]
* 1 1 header sum
* ---------------------------------------
* 2 5 method ID ^
* 7 4 packed size [*2] |
* 11 4 original size |
* 15 2 time |
* 17 2 date |
* 19 1 attribute | [*1] header size (X+Y+22)
* 20 1 level (0x00 fixed) |
* 21 1 name length |
* 22 X pathname |
* X +22 2 file crc (CRC-16) |
* X +24 Y ext-header(old style) v
* -------------------------------------------------
* X+Y+24 data ^
* : | [*2] packed size
* : v
* -------------------------------------------------
*
* ext-header(old style)
* 0 1 ext-type ('U')
* 1 1 minor version
* 2 4 UNIX time
* 6 2 mode
* 8 2 uid
* 10 2 gid
*
* attribute (MS-DOS)
* bit1 read only
* bit2 hidden
* bit3 system
* bit4 volume label
* bit5 directory
* bit6 archive bit (need to backup)
*
*/
static int
get_header_level0(fp, hdr, data)
FILE *fp;
LzHeader *hdr;
char *data;
{
size_t header_size;
ssize_t remain_size;
ssize_t extend_size;
int checksum;
int name_length;
int i;
hdr->size_field_length = 2; /* in bytes */
hdr->header_size = header_size = get_byte();
checksum = get_byte();
/* The data variable has been already read as COMMON_HEADER_SIZE bytes.
So we must read the remaining header size by the header_size. */
remain_size = header_size + 2 - COMMON_HEADER_SIZE;
if (remain_size <= 0) {
error("Invalid header size (LHarc file ?)");
return FALSE;
}
if (fread(data + COMMON_HEADER_SIZE, remain_size, 1, fp) == 0) {
error("Invalid header (LHarc file ?)");
return FALSE; /* finish */
}
if (calc_sum(data + I_METHOD, header_size) != checksum) {
error("Checksum error (LHarc file?)");
return FALSE;
}
get_bytes(hdr->method, 5, sizeof(hdr->method));
hdr->packed_size = (unsigned long)get_longword();
hdr->original_size = (unsigned long)get_longword();
hdr->unix_last_modified_stamp = generic_to_unix_stamp(get_longword());
hdr->attribute = get_byte(); /* MS-DOS attribute */
hdr->header_level = get_byte();
name_length = get_byte();
i = get_bytes(hdr->name, name_length, sizeof(hdr->name)-1);
hdr->name[i] = '\0';
/* defaults for other type */
hdr->unix_mode = UNIX_FILE_REGULAR | UNIX_RW_RW_RW;
hdr->unix_gid = 0;
hdr->unix_uid = 0;
extend_size = header_size+2 - name_length - 24;
if (extend_size < 0) {
if (extend_size == -2) {
/* CRC field is not given */
hdr->extend_type = EXTEND_GENERIC;
hdr->has_crc = FALSE;
return TRUE;
}
error("Unkonwn header (lha file?)");
exit(1);
}
hdr->has_crc = TRUE;
hdr->crc = get_word();
if (extend_size != 0) {
hdr->extend_type = get_byte();
extend_size--;
if (hdr->extend_type == EXTEND_UNIX) {
if (extend_size >= 11) {
hdr->minor_version = get_byte();
hdr->unix_last_modified_stamp = (time_t) get_longword();
hdr->unix_mode = get_word();
hdr->unix_uid = get_word();
hdr->unix_gid = get_word();
extend_size -= 11;
} else {
hdr->extend_type = EXTEND_GENERIC;
}
}
if (extend_size > 0)
skip_bytes(extend_size);
}
hdr->header_size += 2;
return TRUE;
}
/*
* level 1 header
*
*
* offset size field name
* -----------------------------------
* 0 1 header size [*1]
* 1 1 header sum
* -------------------------------------
* 2 5 method ID ^
* 7 4 skip size [*2] |
* 11 4 original size |
* 15 2 time |
* 17 2 date |
* 19 1 attribute (0x20 fixed) | [*1] header size (X+Y+25)
* 20 1 level (0x01 fixed) |
* 21 1 name length |
* 22 X filename |
* X+ 22 2 file crc (CRC-16) |
* X+ 24 1 OS ID |
* X +25 Y ??? |
* X+Y+25 2 next-header size v
* -------------------------------------------------
* X+Y+27 Z ext-header ^
* : |
* ----------------------------------- | [*2] skip size
* X+Y+Z+27 data |
* : v
* -------------------------------------------------
*
*/
static int
get_header_level1(fp, hdr, data)
FILE *fp;
LzHeader *hdr;
char *data;
{
size_t header_size;
ssize_t remain_size;
ssize_t extend_size;
int checksum;
int name_length;
int i, dummy;
hdr->size_field_length = 2; /* in bytes */
hdr->header_size = header_size = get_byte();
checksum = get_byte();
/* The data variable has been already read as COMMON_HEADER_SIZE bytes.
So we must read the remaining header size by the header_size. */
remain_size = header_size + 2 - COMMON_HEADER_SIZE;
if (remain_size <= 0) {
error("Invalid header size (LHarc file ?)");
return FALSE;
}
if (fread(data + COMMON_HEADER_SIZE, remain_size, 1, fp) == 0) {
error("Invalid header (LHarc file ?)");
return FALSE; /* finish */
}
if (calc_sum(data + I_METHOD, header_size) != checksum) {
error("Checksum error (LHarc file?)");
return FALSE;
}
get_bytes(hdr->method, 5, sizeof(hdr->method));
hdr->packed_size = (unsigned long)get_longword(); /* skip size */
hdr->original_size = (unsigned long)get_longword();
hdr->unix_last_modified_stamp = generic_to_unix_stamp(get_longword());
hdr->attribute = get_byte(); /* 0x20 fixed */
hdr->header_level = get_byte();
name_length = get_byte();
i = get_bytes(hdr->name, name_length, sizeof(hdr->name)-1);
hdr->name[i] = '\0';
/* defaults for other type */
hdr->unix_mode = UNIX_FILE_REGULAR | UNIX_RW_RW_RW;
hdr->unix_gid = 0;
hdr->unix_uid = 0;
hdr->has_crc = TRUE;
hdr->crc = get_word();
hdr->extend_type = get_byte();
dummy = header_size+2 - name_length - I_LEVEL1_HEADER_SIZE;
if (dummy > 0)
skip_bytes(dummy); /* skip old style extend header */
extend_size = get_word();
extend_size = get_extended_header(fp, hdr, extend_size, 0);
if (extend_size == -1)