/*
* 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;
}
}
/*
* 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(struct magic *m, char **p)
{
int slen;
if (m->type == STRING) {
*p = getstr(*p, m->value.s, sizeof(m->value.s), &slen);
m->vallen = slen;
}
else if (m->reln != 'x') {
m->value.l = signextend(m, strtoul(*p, p, 0));
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 int
magic_parse(char *p)
{
struct magic *m;
char *t, *s;
int i, j;
if (Magiccnt + 1 > Magicmax)
errx(1, "magic_parse: magic table full");
m = &Magic[Magiccnt];
m->flag = 0;
m->cont_level = 0;
while (*p == '>') {
p++; /* step over */
m->cont_level++;
}
if (m->cont_level != 0 && *p == '(') {
p++; /* step over */
m->flag |= INDIR;
}
if (m->cont_level != 0 && *p == '&') {
p++; /* step over */
m->flag |= ADD;
}
/* Get offset, then skip over it. */
m->offset = (int) strtoul(p, &t, 0);
if (p == t)
errx(1, "magic_parse: offset %s invalid", p);
p = t;
if (m->flag & INDIR) {
m->in.type = LONG;
m->in.offset = 0;
/* read [.lbs][+-]nnnnn) */
if (*p == '.') {
p++;
switch (LOWCASE(*p)) {
case 'l':
m->in.type = LONG;
break;
case 'h':
case 's':
m->in.type = SHORT;
break;
case 'c':
case 'b':
m->in.type = BYTE;
break;
default:
errx(1, "magic_parse: indirect offset "
"type '%c' invalid", *p);
break;
}
p++;
}
s = p;
if (*p == '+' || *p == '-') p++;
if (isdigit((u_char) *p)) {
m->in.offset = strtoul(p, &t, 0);
if (*s == '-') m->in.offset = - m->in.offset;
}
else t = p;
if (*t++ != ')')
errx(1, "magic_parse: missing ')' in indirect offset");
p = t;
}
while (isascii((u_char) *p) && isdigit((u_char) *p)) p++;
while (isascii((u_char) *p) && isspace((u_char) *p)) p++;
if (*p == 'u') {
p++;
m->flag |= UNSIGNED;
}
/* Get type, skip it. */
t = p;
for (i = 0; i < 12; i++) {
j = strlen(Magictypes[i]);
if (strncmp(p, Magictypes[i], j) == 0) {
m->type = i + 1;
p += j;
break;
}
}
if (p == t)
errx(1, "magic_parse: type %s invalid", p);
/* New-style and'ing: "0 byte&0x80 =0x80 dynamically linked" */
if (*p == '&') {
p++;
m->mask = signextend(m, strtoul(p, &p, 0));
eatsize(&p);
}
else m->mask = ~0L;
while (isascii((u_char) *p) && isspace((u_char) *p)) p++;
switch(*p) {
case '>':
case '<':
/* Old-style and'ing: "0 byte &0x80 dynamically linked" */
case '&':
case '^':
case '=':
m->reln = *p;
p++;
break;
case '!':
if (m->type != STRING) {
m->reln = *p;
p++;
break;
}
/* FALLTHRU */
default:
if (*p == 'x' && isascii((u_char) p[1]) &&
isspace((u_char) p[1])) {
m->reln = *p;
p++;
goto parse_get_desc; /* Bill The Cat */
}
m->reln = '=';
break;
}
while (isascii((u_char) *p) && isspace((u_char) *p)) p++;
if (getvalue(m, &p))
return (0);
parse_get_desc:
/* Now get last part - the description. */
while (isascii((u_char) *p) && isspace((u_char) *p)) p++;
strlcpy(m->desc, p, sizeof(m->desc));
if (Opt_debug) {
mdump(m);
}
Magiccnt++;
return (1);
}
