/*
* Read a numeric value from a pointer, into the value union of a magic
* pointer, according to the magic type. Update the string pointer to point
* just after the number read. Return 0 for success, non-zero for failure.
*/
static int getvalue(RMagic *ms, struct r_magic *m, const char **p, int action) {
int slen;
switch (m->type) {
case FILE_BESTRING16:
case FILE_LESTRING16:
case FILE_STRING:
case FILE_PSTRING:
case FILE_REGEX:
case FILE_SEARCH:
*p = getstr(ms, *p, m->value.s, sizeof (m->value.s), &slen, action);
if (!*p) {
if (ms->flags & R_MAGIC_CHECK)
file_magwarn(ms, "cannot get string from `%s'",
m->value.s);
return -1;
}
m->vallen = slen;
if (m->type == FILE_PSTRING)
m->vallen++;
return 0;
case FILE_FLOAT:
case FILE_BEFLOAT:
case FILE_LEFLOAT:
if (m->reln != 'x') {
char *ep;
#ifdef HAVE_STRTOF
m->value.f = strtof(*p, &ep);
#else
m->value.f = (float)strtod(*p, &ep);
#endif
*p = ep;
}
return 0;
case FILE_DOUBLE:
case FILE_BEDOUBLE:
case FILE_LEDOUBLE:
if (m->reln != 'x') {
char *ep;
m->value.d = strtod(*p, &ep);
*p = ep;
}
return 0;
default:
if (m->reln != 'x') {
char *ep;
m->value.q = file_signextend(ms, m,
(ut64)strtoull(*p, &ep, 0));
*p = ep;
eatsize(p);
}
return 0;
}
}
/*
* parse one line from magic file, put into magic[index++] if valid
*/
static int parse(RMagic *ms, struct r_magic_entry **mentryp, ut32 *nmentryp, const char *line, size_t lineno, int action) {
static ut32 last_cont_level = 0;
size_t i;
struct r_magic_entry *me;
struct r_magic *m;
const char *l = line;
char *t;
int op;
ut32 cont_level = 0;
for (; *l == '>'; l++, cont_level++);
if (cont_level == 0 || cont_level > last_cont_level)
if (file_check_mem (ms, cont_level) == -1)
return -1;
last_cont_level = cont_level;
#define ALLOC_CHUNK (size_t)10
#define ALLOC_INCR (size_t)200
if (cont_level != 0) {
if (*nmentryp == 0) {
file_error(ms, 0, "No current entry for continuation");
return -1;
}
me = &(*mentryp)[*nmentryp - 1];
if (me->cont_count == me->max_count) {
struct r_magic *nm;
size_t cnt = me->max_count + ALLOC_CHUNK;
if (!(nm = realloc(me->mp, sizeof (*nm) * cnt))) {
file_oomem(ms, sizeof (*nm) * cnt);
return -1;
}
me->mp = nm;
me->max_count = cnt;
}
m = &me->mp[me->cont_count++];
(void)memset(m, 0, sizeof (*m));
m->cont_level = cont_level;
} else {
if (*nmentryp == maxmagic) {
struct r_magic_entry *mp;
maxmagic += ALLOC_INCR;
if (!(mp = realloc (*mentryp, sizeof (*mp) * maxmagic))) {
file_oomem (ms, sizeof (*mp) * maxmagic);
return -1;
}
(void)memset(&mp[*nmentryp], 0, sizeof (*mp) *
ALLOC_INCR);
*mentryp = mp;
}
me = &(*mentryp)[*nmentryp];
if (!me->mp) {
if (!(m = malloc (sizeof (*m) * ALLOC_CHUNK))) {
file_oomem (ms, sizeof (*m) * ALLOC_CHUNK);
return -1;
}
me->mp = m;
me->max_count = ALLOC_CHUNK;
} else
m = me->mp;
(void)memset(m, 0, sizeof (*m));
m->cont_level = 0;
me->cont_count = 1;
}
m->lineno = lineno;
if (*l == '&') { /* m->cont_level == 0 checked below. */
++l; /* step over */
m->flag |= OFFADD;
}
if (*l == '(') {
++l; /* step over */
m->flag |= INDIR;
if (m->flag & OFFADD)
m->flag = (m->flag & ~OFFADD) | INDIROFFADD;
if (*l == '&') { /* m->cont_level == 0 checked below */
++l; /* step over */
m->flag |= OFFADD;
}
}
/* Indirect offsets are not valid at level 0. */
if (m->cont_level == 0 && (m->flag & (OFFADD | INDIROFFADD)))
if (ms->flags & R_MAGIC_CHECK)
file_magwarn(ms, "relative offset at level 0");
/* get offset, then skip over it */
m->offset = (ut32)strtoul(l, &t, 0);
if ((l == t) && (ms->flags & R_MAGIC_CHECK))
file_magwarn(ms, "offset `%s' invalid", l);
l = t;
if (m->flag & INDIR) {
m->in_type = FILE_LONG;
m->in_offset = 0;
/*
* read [.lbs][+-]nnnnn)
*/
if (*l == '.') {
l++;
switch (*l) {
case 'l':
m->in_type = FILE_LELONG;
break;
case 'L':
m->in_type = FILE_BELONG;
break;
case 'm':
m->in_type = FILE_MELONG;
break;
case 'h':
case 's':
m->in_type = FILE_LESHORT;
break;
case 'H':
case 'S':
m->in_type = FILE_BESHORT;
break;
case 'c':
case 'b':
case 'C':
case 'B':
m->in_type = FILE_BYTE;
break;
case 'e':
case 'f':
case 'g':
m->in_type = FILE_LEDOUBLE;
break;
case 'E':
case 'F':
case 'G':
m->in_type = FILE_BEDOUBLE;
break;
default:
if (ms->flags & R_MAGIC_CHECK)
file_magwarn(ms,
"indirect offset type `%c' invalid",
*l);
break;
}
l++;
}
m->in_op = 0;
if (*l == '~') {
m->in_op |= FILE_OPINVERSE;
l++;
}
if ((op = get_op(*l)) != -1) {
m->in_op |= op;
l++;
}
if (*l == '(') {
m->in_op |= FILE_OPINDIRECT;
l++;
}
if (isdigit((ut8)*l) || *l == '-') {
m->in_offset = (int32_t)strtol(l, &t, 0);
if (l == t)
if (ms->flags & R_MAGIC_CHECK)
file_magwarn(ms,
"in_offset `%s' invalid", l);
l = t;
}
if (*l++ != ')' ||
((m->in_op & FILE_OPINDIRECT) && *l++ != ')'))
if (ms->flags & R_MAGIC_CHECK)
file_magwarn(ms,
"missing ')' in indirect offset");
}
EATAB;
m->cond = get_cond(l, &l);
if (check_cond(ms, m->cond, cont_level) == -1)
return -1;
EATAB;
if (*l == 'u') {
++l;
m->flag |= UNSIGNED;
}
m->type = get_type(l, &l);
if (m->type == FILE_INVALID) {
if (ms->flags & R_MAGIC_CHECK)
file_magwarn(ms, "type `%s' invalid", l);
return -1;
}
/* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */
/* New and improved: ~ & | ^ + - * / % -- exciting, isn't it? */
m->mask_op = 0;
if (*l == '~') {
if (!MAGIC_IS_STRING (m->type))
m->mask_op |= FILE_OPINVERSE;
else if (ms->flags & R_MAGIC_CHECK)
file_magwarn (ms, "'~' invalid for string types");
++l;
}
m->str_range = 0;
m->str_flags = 0;
m->num_mask = 0;
if ((op = get_op (*l)) != -1) {
if (!MAGIC_IS_STRING (m->type)) {
ut64 val;
++l;
m->mask_op |= op;
val = (ut64)strtoull (l, &t, 0);
l = t;
m->num_mask = file_signextend (ms, m, val);
eatsize (&l);
}
else if (op == FILE_OPDIVIDE) {
int have_range = 0;
while (!isspace ((ut8)*++l)) {
switch (*l) {
case '0': case '1': case '2':
case '3': case '4': case '5':
case '6': case '7': case '8':
case '9':
if (have_range &&
(ms->flags & R_MAGIC_CHECK))
file_magwarn(ms,
"multiple ranges");
have_range = 1;
m->str_range = strtoul(l, &t, 0);
if (m->str_range == 0)
file_magwarn(ms,
"zero range");
l = t - 1;
break;
case CHAR_COMPACT_BLANK:
m->str_flags |= STRING_COMPACT_BLANK;
break;
case CHAR_COMPACT_OPTIONAL_BLANK:
m->str_flags |=
STRING_COMPACT_OPTIONAL_BLANK;
break;
case CHAR_IGNORE_LOWERCASE:
m->str_flags |= STRING_IGNORE_LOWERCASE;
break;
case CHAR_IGNORE_UPPERCASE:
m->str_flags |= STRING_IGNORE_UPPERCASE;
break;
case CHAR_REGEX_OFFSET_START:
m->str_flags |= REGEX_OFFSET_START;
break;
default:
if (ms->flags & R_MAGIC_CHECK)
file_magwarn(ms,
"string extension `%c' invalid",
*l);
return -1;
}
/* allow multiple '/' for readability */
if (l[1] == '/' && !isspace ((ut8)l[2]))
l++;
}
if (string_modifier_check(ms, m) == -1)
return -1;
} else {
if (ms->flags & R_MAGIC_CHECK)
file_magwarn(ms, "invalid string op: %c", *t);
return -1;
}
}
/*
* We used to set mask to all 1's here, instead let's just not do
* anything if mask = 0 (unless you have a better idea)
*/
EATAB;
switch (*l) {
case '>':
case '<':
/* Old-style anding: "0 byte &0x80 dynamically linked" */
case '&':
case '^':
case '=':
m->reln = *l;
++l;
if (*l == '=') {
/* HP compat: ignore &= etc. */
++l;
}
break;
case '!':
m->reln = *l;
++l;
break;
default:
m->reln = '='; /* the default relation */
if (*l == 'x' && ((isascii((ut8)l[1]) &&
isspace ((ut8)l[1])) || !l[1])) {
m->reln = *l;
++l;
}
break;
}
/*
* Grab the value part, except for an 'x' reln.
*/
if (m->reln != 'x' && getvalue (ms, m, &l, action))
return -1;
/*
* TODO finish this macro and start using it!
* #define offsetcheck {if (offset > HOWMANY-1)
* magwarn("offset too big"); }
*/
/*
* Now get last part - the description
*/
EATAB;
if (l[0] == '\b') {
++l;
m->flag |= NOSPACE;
} else if ((l[0] == '\\') && (l[1] == 'b')) {
++l;
++l;
m->flag |= NOSPACE;
}
for (i = 0; (m->desc[i++] = *l++) != '\0' && i < sizeof (m->desc); )
continue;
if (i == sizeof (m->desc)) {
m->desc[sizeof (m->desc) - 1] = '\0';
if (ms->flags & R_MAGIC_CHECK)
file_magwarn(ms, "description `%s' truncated", m->desc);
}
/*
* We only do this check while compiling, or if any of the magic
* files were not compiled.
*/
if (ms->flags & R_MAGIC_CHECK)
if (check_format (ms, m) == -1)
return -1;
if (action == FILE_CHECK)
file_mdump (m);
m->mimetype[0] = '\0'; /* initialise MIME type to none */
if (m->cont_level == 0)
++(*nmentryp); /* make room for next */
return 0;
}
static st32 mprint(RMagic *ms, struct r_magic *m) {
ut64 v;
float vf;
double vd;
ut64 t = 0;
char *buf = NULL;
union VALUETYPE *p = &ms->ms_value;
switch (m->type) {
case FILE_BYTE:
v = file_signextend(ms, m, (ut64)p->b);
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
buf = malloc (2);
if (snprintf (buf, 2, "%c", (ut8)v)<0) {
free (buf);
return -1;
}
if (file_printf (ms, R_MAGIC_DESC, buf) == -1) {
free (buf);
return -1;
}
break;
default:
if (file_printf(ms, R_MAGIC_DESC, (ut8) v) == -1)
return -1;
break;
}
t = ms->offset + sizeof(char);
break;
case FILE_SHORT:
case FILE_BESHORT:
case FILE_LESHORT:
v = file_signextend (ms, m, (ut64)p->h);
switch (check_fmt (ms, m)) {
case -1:
return -1;
case 1:
buf = malloc (32);
if (snprintf (buf, 32, "%hu", (unsigned short)v) < 0) {
free (buf);
return -1;
}
if (file_printf(ms, R_MAGIC_DESC, buf) == -1) {
free (buf);
return -1;
}
break;
default:
if (file_printf(ms, R_MAGIC_DESC, (unsigned short) v) == -1)
return -1;
break;
}
t = ms->offset + sizeof(short);
break;
case FILE_LONG:
case FILE_BELONG:
case FILE_LELONG:
case FILE_MELONG:
v = file_signextend(ms, m, (ut64)p->l);
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
buf = malloc (32);
if (snprintf (buf, 32, "%u", (ut32)v) < 0) {
free (buf);
return -1;
}
if (file_printf(ms, R_MAGIC_DESC, buf) == -1) {
free (buf);
return -1;
}
break;
default:
if (file_printf(ms, R_MAGIC_DESC, (ut32) v) == -1)
return -1;
break;
}
t = ms->offset + sizeof(st32);
break;
case FILE_QUAD:
case FILE_BEQUAD:
case FILE_LEQUAD:
v = file_signextend(ms, m, p->q);
if (file_printf(ms, R_MAGIC_DESC, (ut64) v) == -1)
return -1;
t = ms->offset + sizeof(ut64);
break;
case FILE_STRING:
case FILE_PSTRING:
case FILE_BESTRING16:
case FILE_LESTRING16:
if (m->reln == '=' || m->reln == '!') {
if (file_printf (ms, R_MAGIC_DESC, m->value.s) == -1)
return -1;
t = ms->offset + m->vallen;
}
else {
if (*m->value.s == '\0')
p->s[strcspn (p->s, "\n")] = '\0';
if (file_printf (ms, R_MAGIC_DESC, p->s) == -1)
return -1;
t = ms->offset + strlen (p->s);
if (m->type == FILE_PSTRING)
t++;
}
break;
case FILE_DATE:
case FILE_BEDATE:
case FILE_LEDATE:
case FILE_MEDATE:
if (file_printf(ms, R_MAGIC_DESC, file_fmttime(p->l, 1)) == -1)
return -1;
t = ms->offset + sizeof(time_t);
break;
case FILE_LDATE:
case FILE_BELDATE:
case FILE_LELDATE:
case FILE_MELDATE:
if (file_printf(ms, R_MAGIC_DESC, file_fmttime(p->l, 0)) == -1)
return -1;
t = ms->offset + sizeof(time_t);
break;
case FILE_QDATE:
case FILE_BEQDATE:
case FILE_LEQDATE:
if (file_printf(ms, R_MAGIC_DESC, file_fmttime((ut32)p->q, 1))
== -1)
return -1;
t = ms->offset + sizeof(ut64);
break;
case FILE_QLDATE:
case FILE_BEQLDATE:
case FILE_LEQLDATE:
if (file_printf(ms, R_MAGIC_DESC, file_fmttime((ut32)p->q, 0))
== -1)
return -1;
t = ms->offset + sizeof(ut64);
break;
case FILE_FLOAT:
case FILE_BEFLOAT:
case FILE_LEFLOAT:
vf = p->f;
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
buf = malloc (32);
if (snprintf (buf, 32, "%g", vf) < 0) {
free (buf);
return -1;
}
if (file_printf (ms, R_MAGIC_DESC, buf) == -1) {
free (buf);
return -1;
}
break;
default:
if (file_printf(ms, R_MAGIC_DESC, vf) == -1)
return -1;
break;
}
t = ms->offset + sizeof(float);
break;
case FILE_DOUBLE:
case FILE_BEDOUBLE:
case FILE_LEDOUBLE:
vd = p->d;
switch (check_fmt(ms, m)) {
case -1:
return -1;
case 1:
buf = malloc (32);
if (snprintf (buf, 32, "%g", vd) < 0) {
free (buf);
return -1;
}
if (file_printf (ms, R_MAGIC_DESC, buf) == -1) {
free (buf);
return -1;
}
break;
default:
if (file_printf(ms, R_MAGIC_DESC, vd) == -1)
return -1;
break;
}
t = ms->offset + sizeof(double);
break;
case FILE_REGEX: {
char *cp;
int rval;
cp = strdupn((const char *)ms->search.s, ms->search.rm_len);
if (cp == NULL) {
file_oomem(ms, ms->search.rm_len);
return -1;
}
rval = file_printf(ms, R_MAGIC_DESC, cp);
free(cp);
if (rval == -1)
return -1;
if ((m->str_flags & REGEX_OFFSET_START))
t = ms->search.offset;
else
t = ms->search.offset + ms->search.rm_len;
break;
}
case FILE_SEARCH:
if (file_printf(ms, R_MAGIC_DESC, m->value.s) == -1)
return -1;
if ((m->str_flags & REGEX_OFFSET_START))
t = ms->search.offset;
else t = ms->search.offset + m->vallen;
break;
case FILE_DEFAULT:
if (file_printf(ms, R_MAGIC_DESC, m->value.s) == -1)
return -1;
t = ms->offset;
break;
default:
file_magerror(ms, "invalid m->type (%d) in mprint()", m->type);
return -1;
}
free (buf);
return(t);
}
