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Diffstat (limited to 'src/softmagic.c')
| -rw-r--r-- | src/softmagic.c | 2162 |
1 files changed, 2162 insertions, 0 deletions
diff --git a/src/softmagic.c b/src/softmagic.c new file mode 100644 index 0000000..038a1ff --- /dev/null +++ b/src/softmagic.c @@ -0,0 +1,2162 @@ +/* + * Copyright (c) Ian F. Darwin 1986-1995. + * Software written by Ian F. Darwin and others; + * maintained 1995-present by Christos Zoulas and others. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice immediately at the beginning of the file, without modification, + * this list of conditions, and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ +/* + * softmagic - interpret variable magic from MAGIC + */ + +#include "file.h" + +#ifndef lint +FILE_RCSID("@(#)$File: softmagic.c,v 1.159 2013/02/17 22:28:27 christos Exp $") +#endif /* lint */ + +#include "magic.h" +#include <string.h> +#include <ctype.h> +#include <stdlib.h> +#include <time.h> + + +private int match(struct magic_set *, struct magic *, uint32_t, + const unsigned char *, size_t, size_t, int, int, int, int *); +private int mget(struct magic_set *, const unsigned char *, + struct magic *, size_t, size_t, unsigned int, int, int, int, int *); +private int magiccheck(struct magic_set *, struct magic *); +private int32_t mprint(struct magic_set *, struct magic *); +private int32_t moffset(struct magic_set *, struct magic *); +private void mdebug(uint32_t, const char *, size_t); +private int mcopy(struct magic_set *, union VALUETYPE *, int, int, + const unsigned char *, uint32_t, size_t, size_t); +private int mconvert(struct magic_set *, struct magic *, int); +private int print_sep(struct magic_set *, int); +private int handle_annotation(struct magic_set *, struct magic *); +private void cvt_8(union VALUETYPE *, const struct magic *); +private void cvt_16(union VALUETYPE *, const struct magic *); +private void cvt_32(union VALUETYPE *, const struct magic *); +private void cvt_64(union VALUETYPE *, const struct magic *); + +/* + * softmagic - lookup one file in parsed, in-memory copy of database + * Passed the name and FILE * of one file to be typed. + */ +/*ARGSUSED1*/ /* nbytes passed for regularity, maybe need later */ +protected int +file_softmagic(struct magic_set *ms, const unsigned char *buf, size_t nbytes, + int mode, int text) +{ + struct mlist *ml; + int rv; + for (ml = ms->mlist[0]->next; ml != ms->mlist[0]; ml = ml->next) + if ((rv = match(ms, ml->magic, ml->nmagic, buf, nbytes, 0, mode, + text, 0, NULL)) != 0) + return rv; + + return 0; +} + +/* + * Go through the whole list, stopping if you find a match. Process all + * the continuations of that match before returning. + * + * We support multi-level continuations: + * + * At any time when processing a successful top-level match, there is a + * current continuation level; it represents the level of the last + * successfully matched continuation. + * + * Continuations above that level are skipped as, if we see one, it + * means that the continuation that controls them - i.e, the + * lower-level continuation preceding them - failed to match. + * + * Continuations below that level are processed as, if we see one, + * it means we've finished processing or skipping higher-level + * continuations under the control of a successful or unsuccessful + * lower-level continuation, and are now seeing the next lower-level + * continuation and should process it. The current continuation + * level reverts to the level of the one we're seeing. + * + * Continuations at the current level are processed as, if we see + * one, there's no lower-level continuation that may have failed. + * + * If a continuation matches, we bump the current continuation level + * so that higher-level continuations are processed. + */ +private int +match(struct magic_set *ms, struct magic *magic, uint32_t nmagic, + const unsigned char *s, size_t nbytes, size_t offset, int mode, int text, + int flip, int *returnval) +{ + uint32_t magindex = 0; + unsigned int cont_level = 0; + int need_separator = 0; + int returnvalv = 0, e; /* if a match is found it is set to 1*/ + int firstline = 1; /* a flag to print X\n X\n- X */ + int printed_something = 0; + int print = (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) == 0; + + if (returnval == NULL) + returnval = &returnvalv; + + if (file_check_mem(ms, cont_level) == -1) + return -1; + + for (magindex = 0; magindex < nmagic; magindex++) { + int flush = 0; + struct magic *m = &magic[magindex]; + + if (m->type != FILE_NAME) + if ((IS_STRING(m->type) && + ((text && (m->str_flags & (STRING_BINTEST | STRING_TEXTTEST)) == STRING_BINTEST) || + (!text && (m->str_flags & (STRING_TEXTTEST | STRING_BINTEST)) == STRING_TEXTTEST))) || + (m->flag & mode) != mode) { + /* Skip sub-tests */ + while (magindex + 1 < nmagic && + magic[magindex + 1].cont_level != 0 && + ++magindex) + continue; + continue; /* Skip to next top-level test*/ + } + + ms->offset = m->offset; + ms->line = m->lineno; + + /* if main entry matches, print it... */ + switch (mget(ms, s, m, nbytes, offset, cont_level, mode, text, + flip, returnval)) { + case -1: + return -1; + case 0: + flush = m->reln != '!'; + break; + default: + if (m->type == FILE_INDIRECT) + *returnval = 1; + + switch (magiccheck(ms, m)) { + case -1: + return -1; + case 0: + flush++; + break; + default: + flush = 0; + break; + } + break; + } + if (flush) { + /* + * main entry didn't match, + * flush its continuations + */ + while (magindex < nmagic - 1 && + magic[magindex + 1].cont_level != 0) + magindex++; + continue; + } + + if ((e = handle_annotation(ms, m)) != 0) { + *returnval = 1; + return e; + } + /* + * If we are going to print something, we'll need to print + * a blank before we print something else. + */ + if (*m->desc) { + need_separator = 1; + printed_something = 1; + if (print_sep(ms, firstline) == -1) + return -1; + } + + + if (print && mprint(ms, m) == -1) + return -1; + + ms->c.li[cont_level].off = moffset(ms, m); + + /* and any continuations that match */ + if (file_check_mem(ms, ++cont_level) == -1) + return -1; + + while (magic[magindex+1].cont_level != 0 && + ++magindex < nmagic) { + m = &magic[magindex]; + ms->line = m->lineno; /* for messages */ + + if (cont_level < m->cont_level) + continue; + if (cont_level > m->cont_level) { + /* + * We're at the end of the level + * "cont_level" continuations. + */ + cont_level = m->cont_level; + } + ms->offset = m->offset; + if (m->flag & OFFADD) { + ms->offset += + ms->c.li[cont_level - 1].off; + } + +#ifdef ENABLE_CONDITIONALS + if (m->cond == COND_ELSE || + m->cond == COND_ELIF) { + if (ms->c.li[cont_level].last_match == 1) + continue; + } +#endif + switch (mget(ms, s, m, nbytes, offset, cont_level, mode, + text, flip, returnval)) { + case -1: + return -1; + case 0: + if (m->reln != '!') + continue; + flush = 1; + break; + default: + if (m->type == FILE_INDIRECT) + *returnval = 1; + flush = 0; + break; + } + + switch (flush ? 1 : magiccheck(ms, m)) { + case -1: + return -1; + case 0: +#ifdef ENABLE_CONDITIONALS + ms->c.li[cont_level].last_match = 0; +#endif + break; + default: +#ifdef ENABLE_CONDITIONALS + ms->c.li[cont_level].last_match = 1; +#endif + if (m->type != FILE_DEFAULT) + ms->c.li[cont_level].got_match = 1; + else if (ms->c.li[cont_level].got_match) { + ms->c.li[cont_level].got_match = 0; + break; + } + if ((e = handle_annotation(ms, m)) != 0) { + *returnval = 1; + return e; + } + /* + * If we are going to print something, + * make sure that we have a separator first. + */ + if (*m->desc) { + if (!printed_something) { + printed_something = 1; + if (print_sep(ms, firstline) + == -1) + return -1; + } + } + /* + * This continuation matched. Print + * its message, with a blank before it + * if the previous item printed and + * this item isn't empty. + */ + /* space if previous printed */ + if (need_separator + && ((m->flag & NOSPACE) == 0) + && *m->desc) { + if (print && + file_printf(ms, " ") == -1) + return -1; + need_separator = 0; + } + if (print && mprint(ms, m) == -1) + return -1; + + ms->c.li[cont_level].off = moffset(ms, m); + + if (*m->desc) + need_separator = 1; + + /* + * If we see any continuations + * at a higher level, + * process them. + */ + if (file_check_mem(ms, ++cont_level) == -1) + return -1; + break; + } + } + if (printed_something) { + firstline = 0; + if (print) + *returnval = 1; + } + if ((ms->flags & MAGIC_CONTINUE) == 0 && printed_something) { + return *returnval; /* don't keep searching */ + } + } + return *returnval; /* This is hit if -k is set or there is no match */ +} + +private int +check_fmt(struct magic_set *ms, struct magic *m) +{ + regex_t rx; + int rc; + + if (strchr(m->desc, '%') == NULL) + return 0; + + rc = regcomp(&rx, "%[-0-9\\.]*s", REG_EXTENDED|REG_NOSUB); + if (rc) { + char errmsg[512]; + (void)regerror(rc, &rx, errmsg, sizeof(errmsg)); + file_magerror(ms, "regex error %d, (%s)", rc, errmsg); + return -1; + } else { + rc = regexec(&rx, m->desc, 0, 0, 0); + regfree(&rx); + return !rc; + } +} + +#ifndef HAVE_STRNDUP +char * strndup(const char *, size_t); + +char * +strndup(const char *str, size_t n) +{ + size_t len; + char *copy; + + for (len = 0; len < n && str[len]; len++) + continue; + if ((copy = malloc(len + 1)) == NULL) + return NULL; + (void)memcpy(copy, str, len); + copy[len] = '\0'; + return copy; +} +#endif /* HAVE_STRNDUP */ + +private int32_t +mprint(struct magic_set *ms, struct magic *m) +{ + uint64_t v; + float vf; + double vd; + int64_t t = 0; + char buf[128], tbuf[26]; + union VALUETYPE *p = &ms->ms_value; + + switch (m->type) { + case FILE_BYTE: + v = file_signextend(ms, m, (uint64_t)p->b); + switch (check_fmt(ms, m)) { + case -1: + return -1; + case 1: + (void)snprintf(buf, sizeof(buf), "%c", + (unsigned char)v); + if (file_printf(ms, m->desc, buf) == -1) + return -1; + break; + default: + if (file_printf(ms, m->desc, (unsigned char) 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, (uint64_t)p->h); + switch (check_fmt(ms, m)) { + case -1: + return -1; + case 1: + (void)snprintf(buf, sizeof(buf), "%hu", + (unsigned short)v); + if (file_printf(ms, m->desc, buf) == -1) + return -1; + break; + default: + if ( + file_printf(ms, m->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, (uint64_t)p->l); + switch (check_fmt(ms, m)) { + case -1: + return -1; + case 1: + (void)snprintf(buf, sizeof(buf), "%u", (uint32_t)v); + if (file_printf(ms, m->desc, buf) == -1) + return -1; + break; + default: + if (file_printf(ms, m->desc, (uint32_t) v) == -1) + return -1; + break; + } + t = ms->offset + sizeof(int32_t); + break; + + case FILE_QUAD: + case FILE_BEQUAD: + case FILE_LEQUAD: + v = file_signextend(ms, m, p->q); + if (file_printf(ms, m->desc, (uint64_t) v) == -1) + return -1; + t = ms->offset + sizeof(int64_t); + break; + + case FILE_STRING: + case FILE_PSTRING: + case FILE_BESTRING16: + case FILE_LESTRING16: + if (m->reln == '=' || m->reln == '!') { + if (file_printf(ms, m->desc, m->value.s) == -1) + return -1; + t = ms->offset + m->vallen; + } + else { + char *str = p->s; + + /* compute t before we mangle the string? */ + t = ms->offset + strlen(str); + + if (*m->value.s == '\0') + str[strcspn(str, "\n")] = '\0'; + + if (m->str_flags & STRING_TRIM) { + char *last; + while (isspace((unsigned char)*str)) + str++; + last = str; + while (*last) + last++; + --last; + while (isspace((unsigned char)*last)) + last--; + *++last = '\0'; + } + + if (file_printf(ms, m->desc, str) == -1) + return -1; + + if (m->type == FILE_PSTRING) + t += file_pstring_length_size(m); + } + break; + + case FILE_DATE: + case FILE_BEDATE: + case FILE_LEDATE: + case FILE_MEDATE: + if (file_printf(ms, m->desc, file_fmttime(p->l, FILE_T_LOCAL, + tbuf)) == -1) + return -1; + t = ms->offset + sizeof(uint32_t); + break; + + case FILE_LDATE: + case FILE_BELDATE: + case FILE_LELDATE: + case FILE_MELDATE: + if (file_printf(ms, m->desc, file_fmttime(p->l, 0, tbuf)) == -1) + return -1; + t = ms->offset + sizeof(uint32_t); + break; + + case FILE_QDATE: + case FILE_BEQDATE: + case FILE_LEQDATE: + if (file_printf(ms, m->desc, file_fmttime(p->q, FILE_T_LOCAL, + tbuf)) == -1) + return -1; + t = ms->offset + sizeof(uint64_t); + break; + + case FILE_QLDATE: + case FILE_BEQLDATE: + case FILE_LEQLDATE: + if (file_printf(ms, m->desc, file_fmttime(p->q, 0, tbuf)) == -1) + return -1; + t = ms->offset + sizeof(uint64_t); + break; + + case FILE_QWDATE: + case FILE_BEQWDATE: + case FILE_LEQWDATE: + if (file_printf(ms, m->desc, file_fmttime(p->q, FILE_T_WINDOWS, + tbuf)) == -1) + return -1; + t = ms->offset + sizeof(uint64_t); + break; + + case FILE_FLOAT: + case FILE_BEFLOAT: + case FILE_LEFLOAT: + vf = p->f; + switch (check_fmt(ms, m)) { + case -1: + return -1; + case 1: + (void)snprintf(buf, sizeof(buf), "%g", vf); + if (file_printf(ms, m->desc, buf) == -1) + return -1; + break; + default: + if (file_printf(ms, m->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: + (void)snprintf(buf, sizeof(buf), "%g", vd); + if (file_printf(ms, m->desc, buf) == -1) + return -1; + break; + default: + if (file_printf(ms, m->desc, vd) == -1) + return -1; + break; + } + t = ms->offset + sizeof(double); + break; + + case FILE_REGEX: { + char *cp; + int rval; + + cp = strndup((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, m->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, m->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, m->desc, m->value.s) == -1) + return -1; + t = ms->offset; + break; + + case FILE_INDIRECT: + case FILE_USE: + case FILE_NAME: + t = ms->offset; + break; + + default: + file_magerror(ms, "invalid m->type (%d) in mprint()", m->type); + return -1; + } + return (int32_t)t; +} + +private int32_t +moffset(struct magic_set *ms, struct magic *m) +{ + switch (m->type) { + case FILE_BYTE: + return CAST(int32_t, (ms->offset + sizeof(char))); + + case FILE_SHORT: + case FILE_BESHORT: + case FILE_LESHORT: + return CAST(int32_t, (ms->offset + sizeof(short))); + + case FILE_LONG: + case FILE_BELONG: + case FILE_LELONG: + case FILE_MELONG: + return CAST(int32_t, (ms->offset + sizeof(int32_t))); + + case FILE_QUAD: + case FILE_BEQUAD: + case FILE_LEQUAD: + return CAST(int32_t, (ms->offset + sizeof(int64_t))); + + case FILE_STRING: + case FILE_PSTRING: + case FILE_BESTRING16: + case FILE_LESTRING16: + if (m->reln == '=' || m->reln == '!') + return ms->offset + m->vallen; + else { + union VALUETYPE *p = &ms->ms_value; + uint32_t t; + + if (*m->value.s == '\0') + p->s[strcspn(p->s, "\n")] = '\0'; + t = CAST(uint32_t, (ms->offset + strlen(p->s))); + if (m->type == FILE_PSTRING) + t += (uint32_t)file_pstring_length_size(m); + return t; + } + + case FILE_DATE: + case FILE_BEDATE: + case FILE_LEDATE: + case FILE_MEDATE: + return CAST(int32_t, (ms->offset + sizeof(uint32_t))); + + case FILE_LDATE: + case FILE_BELDATE: + case FILE_LELDATE: + case FILE_MELDATE: + return CAST(int32_t, (ms->offset + sizeof(uint32_t))); + + case FILE_QDATE: + case FILE_BEQDATE: + case FILE_LEQDATE: + return CAST(int32_t, (ms->offset + sizeof(uint64_t))); + + case FILE_QLDATE: + case FILE_BEQLDATE: + case FILE_LEQLDATE: + return CAST(int32_t, (ms->offset + sizeof(uint64_t))); + + case FILE_FLOAT: + case FILE_BEFLOAT: + case FILE_LEFLOAT: + return CAST(int32_t, (ms->offset + sizeof(float))); + + case FILE_DOUBLE: + case FILE_BEDOUBLE: + case FILE_LEDOUBLE: + return CAST(int32_t, (ms->offset + sizeof(double))); + + case FILE_REGEX: + if ((m->str_flags & REGEX_OFFSET_START) != 0) + return CAST(int32_t, ms->search.offset); + else + return CAST(int32_t, (ms->search.offset + + ms->search.rm_len)); + + case FILE_SEARCH: + if ((m->str_flags & REGEX_OFFSET_START) != 0) + return CAST(int32_t, ms->search.offset); + else + return CAST(int32_t, (ms->search.offset + m->vallen)); + + case FILE_DEFAULT: + return ms->offset; + + case FILE_INDIRECT: + return ms->offset; + + default: + return 0; + } +} + +private int +cvt_flip(int type, int flip) +{ + if (flip == 0) + return type; + switch (type) { + case FILE_BESHORT: + return FILE_LESHORT; + case FILE_BELONG: + return FILE_LELONG; + case FILE_BEDATE: + return FILE_LEDATE; + case FILE_BELDATE: + return FILE_LELDATE; + case FILE_BEQUAD: + return FILE_LEQUAD; + case FILE_BEQDATE: + return FILE_LEQDATE; + case FILE_BEQLDATE: + return FILE_LEQLDATE; + case FILE_BEQWDATE: + return FILE_LEQWDATE; + case FILE_LESHORT: + return FILE_BESHORT; + case FILE_LELONG: + return FILE_BELONG; + case FILE_LEDATE: + return FILE_BEDATE; + case FILE_LELDATE: + return FILE_BELDATE; + case FILE_LEQUAD: + return FILE_BEQUAD; + case FILE_LEQDATE: + return FILE_BEQDATE; + case FILE_LEQLDATE: + return FILE_BEQLDATE; + case FILE_LEQWDATE: + return FILE_BEQWDATE; + case FILE_BEFLOAT: + return FILE_LEFLOAT; + case FILE_LEFLOAT: + return FILE_BEFLOAT; + case FILE_BEDOUBLE: + return FILE_LEDOUBLE; + case FILE_LEDOUBLE: + return FILE_BEDOUBLE; + default: + return type; + } +} +#define DO_CVT(fld, cast) \ + if (m->num_mask) \ + switch (m->mask_op & FILE_OPS_MASK) { \ + case FILE_OPAND: \ + p->fld &= cast m->num_mask; \ + break; \ + case FILE_OPOR: \ + p->fld |= cast m->num_mask; \ + break; \ + case FILE_OPXOR: \ + p->fld ^= cast m->num_mask; \ + break; \ + case FILE_OPADD: \ + p->fld += cast m->num_mask; \ + break; \ + case FILE_OPMINUS: \ + p->fld -= cast m->num_mask; \ + break; \ + case FILE_OPMULTIPLY: \ + p->fld *= cast m->num_mask; \ + break; \ + case FILE_OPDIVIDE: \ + p->fld /= cast m->num_mask; \ + break; \ + case FILE_OPMODULO: \ + p->fld %= cast m->num_mask; \ + break; \ + } \ + if (m->mask_op & FILE_OPINVERSE) \ + p->fld = ~p->fld \ + +private void +cvt_8(union VALUETYPE *p, const struct magic *m) +{ + DO_CVT(b, (uint8_t)); +} + +private void +cvt_16(union VALUETYPE *p, const struct magic *m) +{ + DO_CVT(h, (uint16_t)); +} + +private void +cvt_32(union VALUETYPE *p, const struct magic *m) +{ + DO_CVT(l, (uint32_t)); +} + +private void +cvt_64(union VALUETYPE *p, const struct magic *m) +{ + DO_CVT(q, (uint64_t)); +} + +#define DO_CVT2(fld, cast) \ + if (m->num_mask) \ + switch (m->mask_op & FILE_OPS_MASK) { \ + case FILE_OPADD: \ + p->fld += cast m->num_mask; \ + break; \ + case FILE_OPMINUS: \ + p->fld -= cast m->num_mask; \ + break; \ + case FILE_OPMULTIPLY: \ + p->fld *= cast m->num_mask; \ + break; \ + case FILE_OPDIVIDE: \ + p->fld /= cast m->num_mask; \ + break; \ + } \ + +private void +cvt_float(union VALUETYPE *p, const struct magic *m) +{ + DO_CVT2(f, (float)); +} + +private void +cvt_double(union VALUETYPE *p, const struct magic *m) +{ + DO_CVT2(d, (double)); +} + +/* + * Convert the byte order of the data we are looking at + * While we're here, let's apply the mask operation + * (unless you have a better idea) + */ +private int +mconvert(struct magic_set *ms, struct magic *m, int flip) +{ + union VALUETYPE *p = &ms->ms_value; + + switch (cvt_flip(m->type, flip)) { + case FILE_BYTE: + cvt_8(p, m); + return 1; + case FILE_SHORT: + cvt_16(p, m); + return 1; + case FILE_LONG: + case FILE_DATE: + case FILE_LDATE: + cvt_32(p, m); + return 1; + case FILE_QUAD: + case FILE_QDATE: + case FILE_QLDATE: + case FILE_QWDATE: + cvt_64(p, m); + return 1; + case FILE_STRING: + case FILE_BESTRING16: + case FILE_LESTRING16: { + /* Null terminate and eat *trailing* return */ + p->s[sizeof(p->s) - 1] = '\0'; + return 1; + } + case FILE_PSTRING: { + char *ptr1 = p->s, *ptr2 = ptr1 + file_pstring_length_size(m); + size_t len = file_pstring_get_length(m, ptr1); + if (len >= sizeof(p->s)) + len = sizeof(p->s) - 1; + while (len--) + *ptr1++ = *ptr2++; + *ptr1 = '\0'; + return 1; + } + case FILE_BESHORT: + p->h = (short)((p->hs[0]<<8)|(p->hs[1])); + cvt_16(p, m); + return 1; + case FILE_BELONG: + case FILE_BEDATE: + case FILE_BELDATE: + p->l = (int32_t) + ((p->hl[0]<<24)|(p->hl[1]<<16)|(p->hl[2]<<8)|(p->hl[3])); + cvt_32(p, m); + return 1; + case FILE_BEQUAD: + case FILE_BEQDATE: + case FILE_BEQLDATE: + case FILE_BEQWDATE: + p->q = (uint64_t) + (((uint64_t)p->hq[0]<<56)|((uint64_t)p->hq[1]<<48)| + ((uint64_t)p->hq[2]<<40)|((uint64_t)p->hq[3]<<32)| + ((uint64_t)p->hq[4]<<24)|((uint64_t)p->hq[5]<<16)| + ((uint64_t)p->hq[6]<<8)|((uint64_t)p->hq[7])); + cvt_64(p, m); + return 1; + case FILE_LESHORT: + p->h = (short)((p->hs[1]<<8)|(p->hs[0])); + cvt_16(p, m); + return 1; + case FILE_LELONG: + case FILE_LEDATE: + case FILE_LELDATE: + p->l = (int32_t) + ((p->hl[3]<<24)|(p->hl[2]<<16)|(p->hl[1]<<8)|(p->hl[0])); + cvt_32(p, m); + return 1; + case FILE_LEQUAD: + case FILE_LEQDATE: + case FILE_LEQLDATE: + case FILE_LEQWDATE: + p->q = (uint64_t) + (((uint64_t)p->hq[7]<<56)|((uint64_t)p->hq[6]<<48)| + ((uint64_t)p->hq[5]<<40)|((uint64_t)p->hq[4]<<32)| + ((uint64_t)p->hq[3]<<24)|((uint64_t)p->hq[2]<<16)| + ((uint64_t)p->hq[1]<<8)|((uint64_t)p->hq[0])); + cvt_64(p, m); + return 1; + case FILE_MELONG: + case FILE_MEDATE: + case FILE_MELDATE: + p->l = (int32_t) + ((p->hl[1]<<24)|(p->hl[0]<<16)|(p->hl[3]<<8)|(p->hl[2])); + cvt_32(p, m); + return 1; + case FILE_FLOAT: + cvt_float(p, m); + return 1; + case FILE_BEFLOAT: + p->l = ((uint32_t)p->hl[0]<<24)|((uint32_t)p->hl[1]<<16)| + ((uint32_t)p->hl[2]<<8) |((uint32_t)p->hl[3]); + cvt_float(p, m); + return 1; + case FILE_LEFLOAT: + p->l = ((uint32_t)p->hl[3]<<24)|((uint32_t)p->hl[2]<<16)| + ((uint32_t)p->hl[1]<<8) |((uint32_t)p->hl[0]); + cvt_float(p, m); + return 1; + case FILE_DOUBLE: + cvt_double(p, m); + return 1; + case FILE_BEDOUBLE: + p->q = ((uint64_t)p->hq[0]<<56)|((uint64_t)p->hq[1]<<48)| + ((uint64_t)p->hq[2]<<40)|((uint64_t)p->hq[3]<<32)| + ((uint64_t)p->hq[4]<<24)|((uint64_t)p->hq[5]<<16)| + ((uint64_t)p->hq[6]<<8) |((uint64_t)p->hq[7]); + cvt_double(p, m); + return 1; + case FILE_LEDOUBLE: + p->q = ((uint64_t)p->hq[7]<<56)|((uint64_t)p->hq[6]<<48)| + ((uint64_t)p->hq[5]<<40)|((uint64_t)p->hq[4]<<32)| + ((uint64_t)p->hq[3]<<24)|((uint64_t)p->hq[2]<<16)| + ((uint64_t)p->hq[1]<<8) |((uint64_t)p->hq[0]); + cvt_double(p, m); + return 1; + case FILE_REGEX: + case FILE_SEARCH: + case FILE_DEFAULT: + case FILE_NAME: + case FILE_USE: + return 1; + default: + file_magerror(ms, "invalid type %d in mconvert()", m->type); + return 0; + } +} + + +private void +mdebug(uint32_t offset, const char *str, size_t len) +{ + (void) fprintf(stderr, "mget/%zu @%d: ", len, offset); + file_showstr(stderr, str, len); + (void) fputc('\n', stderr); + (void) fputc('\n', stderr); +} + +private int +mcopy(struct magic_set *ms, union VALUETYPE *p, int type, int indir, + const unsigned char *s, uint32_t offset, size_t nbytes, size_t linecnt) +{ + /* + * Note: FILE_SEARCH and FILE_REGEX do not actually copy + * anything, but setup pointers into the source + */ + if (indir == 0) { + switch (type) { + case FILE_SEARCH: + ms->search.s = RCAST(const char *, s) + offset; + ms->search.s_len = nbytes - offset; + ms->search.offset = offset; + return 0; + + case FILE_REGEX: { + const char *b; + const char *c; + const char *last; /* end of search region */ + const char *buf; /* start of search region */ + const char *end; + size_t lines; + + if (s == NULL) { + ms->search.s_len = 0; + ms->search.s = NULL; + return 0; + } + buf = RCAST(const char *, s) + offset; + end = last = RCAST(const char *, s) + nbytes; + /* mget() guarantees buf <= last */ + for (lines = linecnt, b = buf; lines && b < end && + ((b = CAST(const char *, + memchr(c = b, '\n', CAST(size_t, (end - b))))) + || (b = CAST(const char *, + memchr(c, '\r', CAST(size_t, (end - c)))))); + lines--, b++) { + last = b; + if (b[0] == '\r' && b[1] == '\n') + b++; + } + if (lines) + last = RCAST(const char *, s) + nbytes; + + ms->search.s = buf; + ms->search.s_len = last - buf; + ms->search.offset = offset; + ms->search.rm_len = 0; + return 0; + } + case FILE_BESTRING16: + case FILE_LESTRING16: { + const unsigned char *src = s + offset; + const unsigned char *esrc = s + nbytes; + char *dst = p->s; + char *edst = &p->s[sizeof(p->s) - 1]; + + if (type == FILE_BESTRING16) + src++; + + /* check that offset is within range */ + if (offset >= nbytes) { + file_magerror(ms, "invalid offset %u in mcopy()", + offset); + return -1; + } + for (/*EMPTY*/; src < esrc; src += 2, dst++) { + if (dst < edst) + *dst = *src; + else + break; + if (*dst == '\0') { + if (type == FILE_BESTRING16 ? + *(src - 1) != '\0' : + *(src + 1) != '\0') + *dst = ' '; + } + } + *edst = '\0'; + return 0; + } + case FILE_STRING: /* XXX - these two should not need */ + case FILE_PSTRING: /* to copy anything, but do anyway. */ + default: + break; + } + } + + if (offset >= nbytes) { + (void)memset(p, '\0', sizeof(*p)); + return 0; + } + if (nbytes - offset < sizeof(*p)) + nbytes = nbytes - offset; + else + nbytes = sizeof(*p); + + (void)memcpy(p, s + offset, nbytes); + + /* + * the usefulness of padding with zeroes eludes me, it + * might even cause problems + */ + if (nbytes < sizeof(*p)) + (void)memset(((char *)(void *)p) + nbytes, '\0', + sizeof(*p) - nbytes); + return 0; +} + +private int +mget(struct magic_set *ms, const unsigned char *s, struct magic *m, + size_t nbytes, size_t o, unsigned int cont_level, int mode, int text, + int flip, int *returnval) +{ + uint32_t offset = ms->offset; + uint32_t count = m->str_range; + int rv; + char *sbuf, *rbuf; + union VALUETYPE *p = &ms->ms_value; + struct mlist ml; + + if (mcopy(ms, p, m->type, m->flag & INDIR, s, (uint32_t)(offset + o), + (uint32_t)nbytes, count) == -1) + return -1; + + if ((ms->flags & MAGIC_DEBUG) != 0) { + fprintf(stderr, "mget(type=%d, flag=%x, offset=%u, o=%zu, " + "nbytes=%zu, count=%u)\n", m->type, m->flag, offset, o, + nbytes, count); + mdebug(offset, (char *)(void *)p, sizeof(union VALUETYPE)); +#ifndef COMPILE_ONLY + file_mdump(m); +#endif + } + + if (m->flag & INDIR) { + int off = m->in_offset; + if (m->in_op & FILE_OPINDIRECT) { + const union VALUETYPE *q = CAST(const union VALUETYPE *, + ((const void *)(s + offset + off))); + switch (cvt_flip(m->in_type, flip)) { + case FILE_BYTE: + off = q->b; + break; + case FILE_SHORT: + off = q->h; + break; + case FILE_BESHORT: + off = (short)((q->hs[0]<<8)|(q->hs[1])); + break; + case FILE_LESHORT: + off = (short)((q->hs[1]<<8)|(q->hs[0])); + break; + case FILE_LONG: + off = q->l; + break; + case FILE_BELONG: + case FILE_BEID3: + off = (int32_t)((q->hl[0]<<24)|(q->hl[1]<<16)| + (q->hl[2]<<8)|(q->hl[3])); + break; + case FILE_LEID3: + case FILE_LELONG: + off = (int32_t)((q->hl[3]<<24)|(q->hl[2]<<16)| + (q->hl[1]<<8)|(q->hl[0])); + break; + case FILE_MELONG: + off = (int32_t)((q->hl[1]<<24)|(q->hl[0]<<16)| + (q->hl[3]<<8)|(q->hl[2])); + break; + } + if ((ms->flags & MAGIC_DEBUG) != 0) + fprintf(stderr, "indirect offs=%u\n", off); + } + switch (cvt_flip(m->in_type, flip)) { + case FILE_BYTE: + if (nbytes < (offset + 1)) + return 0; + if (off) { + switch (m->in_op & FILE_OPS_MASK) { + case FILE_OPAND: + offset = p->b & off; + break; + case FILE_OPOR: + offset = p->b | off; + break; + case FILE_OPXOR: + offset = p->b ^ off; + break; + case FILE_OPADD: + offset = p->b + off; + break; + case FILE_OPMINUS: + offset = p->b - off; + break; + case FILE_OPMULTIPLY: + offset = p->b * off; + break; + case FILE_OPDIVIDE: + offset = p->b / off; + break; + case FILE_OPMODULO: + offset = p->b % off; + break; + } + } else + offset = p->b; + if (m->in_op & FILE_OPINVERSE) + offset = ~offset; + break; + case FILE_BESHORT: + if (nbytes < (offset + 2)) + return 0; + if (off) { + switch (m->in_op & FILE_OPS_MASK) { + case FILE_OPAND: + offset = (short)((p->hs[0]<<8)| + (p->hs[1])) & + off; + break; + case FILE_OPOR: + offset = (short)((p->hs[0]<<8)| + (p->hs[1])) | + off; + break; + case FILE_OPXOR: + offset = (short)((p->hs[0]<<8)| + (p->hs[1])) ^ + off; + break; + case FILE_OPADD: + offset = (short)((p->hs[0]<<8)| + (p->hs[1])) + + off; + break; + case FILE_OPMINUS: + offset = (short)((p->hs[0]<<8)| + (p->hs[1])) - + off; + break; + case FILE_OPMULTIPLY: + offset = (short)((p->hs[0]<<8)| + (p->hs[1])) * + off; + break; + case FILE_OPDIVIDE: + offset = (short)((p->hs[0]<<8)| + (p->hs[1])) / + off; + break; + case FILE_OPMODULO: + offset = (short)((p->hs[0]<<8)| + (p->hs[1])) % + off; + break; + } + } else + offset = (short)((p->hs[0]<<8)| + (p->hs[1])); + if (m->in_op & FILE_OPINVERSE) + offset = ~offset; + break; + case FILE_LESHORT: + if (nbytes < (offset + 2)) + return 0; + if (off) { + switch (m->in_op & FILE_OPS_MASK) { + case FILE_OPAND: + offset = (short)((p->hs[1]<<8)| + (p->hs[0])) & + off; + break; + case FILE_OPOR: + offset = (short)((p->hs[1]<<8)| + (p->hs[0])) | + off; + break; + case FILE_OPXOR: + offset = (short)((p->hs[1]<<8)| + (p->hs[0])) ^ + off; + break; + case FILE_OPADD: + offset = (short)((p->hs[1]<<8)| + (p->hs[0])) + + off; + break; + case FILE_OPMINUS: + offset = (short)((p->hs[1]<<8)| + (p->hs[0])) - + off; + break; + case FILE_OPMULTIPLY: + offset = (short)((p->hs[1]<<8)| + (p->hs[0])) * + off; + break; + case FILE_OPDIVIDE: + offset = (short)((p->hs[1]<<8)| + (p->hs[0])) / + off; + break; + case FILE_OPMODULO: + offset = (short)((p->hs[1]<<8)| + (p->hs[0])) % + off; + break; + } + } else + offset = (short)((p->hs[1]<<8)| + (p->hs[0])); + if (m->in_op & FILE_OPINVERSE) + offset = ~offset; + break; + case FILE_SHORT: + if (nbytes < (offset + 2)) + return 0; + if (off) { + switch (m->in_op & FILE_OPS_MASK) { + case FILE_OPAND: + offset = p->h & off; + break; + case FILE_OPOR: + offset = p->h | off; + break; + case FILE_OPXOR: + offset = p->h ^ off; + break; + case FILE_OPADD: + offset = p->h + off; + break; + case FILE_OPMINUS: + offset = p->h - off; + break; + case FILE_OPMULTIPLY: + offset = p->h * off; + break; + case FILE_OPDIVIDE: + offset = p->h / off; + break; + case FILE_OPMODULO: + offset = p->h % off; + break; + } + } + else + offset = p->h; + if (m->in_op & FILE_OPINVERSE) + offset = ~offset; + break; + case FILE_BELONG: + case FILE_BEID3: + if (nbytes < (offset + 4)) + return 0; + if (off) { + switch (m->in_op & FILE_OPS_MASK) { + case FILE_OPAND: + offset = (int32_t)((p->hl[0]<<24)| + (p->hl[1]<<16)| + (p->hl[2]<<8)| + (p->hl[3])) & + off; + break; + case FILE_OPOR: + offset = (int32_t)((p->hl[0]<<24)| + (p->hl[1]<<16)| + (p->hl[2]<<8)| + (p->hl[3])) | + off; + break; + case FILE_OPXOR: + offset = (int32_t)((p->hl[0]<<24)| + (p->hl[1]<<16)| + (p->hl[2]<<8)| + (p->hl[3])) ^ + off; + break; + case FILE_OPADD: + offset = (int32_t)((p->hl[0]<<24)| + (p->hl[1]<<16)| + (p->hl[2]<<8)| + (p->hl[3])) + + off; + break; + case FILE_OPMINUS: + offset = (int32_t)((p->hl[0]<<24)| + (p->hl[1]<<16)| + (p->hl[2]<<8)| + (p->hl[3])) - + off; + break; + case FILE_OPMULTIPLY: + offset = (int32_t)((p->hl[0]<<24)| + (p->hl[1]<<16)| + (p->hl[2]<<8)| + (p->hl[3])) * + off; + break; + case FILE_OPDIVIDE: + offset = (int32_t)((p->hl[0]<<24)| + (p->hl[1]<<16)| + (p->hl[2]<<8)| + (p->hl[3])) / + off; + break; + case FILE_OPMODULO: + offset = (int32_t)((p->hl[0]<<24)| + (p->hl[1]<<16)| + (p->hl[2]<<8)| + (p->hl[3])) % + off; + break; + } + } else + offset = (int32_t)((p->hl[0]<<24)| + (p->hl[1]<<16)| + (p->hl[2]<<8)| + (p->hl[3])); + if (m->in_op & FILE_OPINVERSE) + offset = ~offset; + break; + case FILE_LELONG: + case FILE_LEID3: + if (nbytes < (offset + 4)) + return 0; + if (off) { + switch (m->in_op & FILE_OPS_MASK) { + case FILE_OPAND: + offset = (int32_t)((p->hl[3]<<24)| + (p->hl[2]<<16)| + (p->hl[1]<<8)| + (p->hl[0])) & + off; + break; + case FILE_OPOR: + offset = (int32_t)((p->hl[3]<<24)| + (p->hl[2]<<16)| + (p->hl[1]<<8)| + (p->hl[0])) | + off; + break; + case FILE_OPXOR: + offset = (int32_t)((p->hl[3]<<24)| + (p->hl[2]<<16)| + (p->hl[1]<<8)| + (p->hl[0])) ^ + off; + break; + case FILE_OPADD: + offset = (int32_t)((p->hl[3]<<24)| + (p->hl[2]<<16)| + (p->hl[1]<<8)| + (p->hl[0])) + + off; + break; + case FILE_OPMINUS: + offset = (int32_t)((p->hl[3]<<24)| + (p->hl[2]<<16)| + (p->hl[1]<<8)| + (p->hl[0])) - + off; + break; + case FILE_OPMULTIPLY: + offset = (int32_t)((p->hl[3]<<24)| + (p->hl[2]<<16)| + (p->hl[1]<<8)| + (p->hl[0])) * + off; + break; + case FILE_OPDIVIDE: + offset = (int32_t)((p->hl[3]<<24)| + (p->hl[2]<<16)| + (p->hl[1]<<8)| + (p->hl[0])) / + off; + break; + case FILE_OPMODULO: + offset = (int32_t)((p->hl[3]<<24)| + (p->hl[2]<<16)| + (p->hl[1]<<8)| + (p->hl[0])) % + off; + break; + } + } else + offset = (int32_t)((p->hl[3]<<24)| + (p->hl[2]<<16)| + (p->hl[1]<<8)| + (p->hl[0])); + if (m->in_op & FILE_OPINVERSE) + offset = ~offset; + break; + case FILE_MELONG: + if (nbytes < (offset + 4)) + return 0; + if (off) { + switch (m->in_op & FILE_OPS_MASK) { + case FILE_OPAND: + offset = (int32_t)((p->hl[1]<<24)| + (p->hl[0]<<16)| + (p->hl[3]<<8)| + (p->hl[2])) & + off; + break; + case FILE_OPOR: + offset = (int32_t)((p->hl[1]<<24)| + (p->hl[0]<<16)| + (p->hl[3]<<8)| + (p->hl[2])) | + off; + break; + case FILE_OPXOR: + offset = (int32_t)((p->hl[1]<<24)| + (p->hl[0]<<16)| + (p->hl[3]<<8)| + (p->hl[2])) ^ + off; + break; + case FILE_OPADD: + offset = (int32_t)((p->hl[1]<<24)| + (p->hl[0]<<16)| + (p->hl[3]<<8)| + (p->hl[2])) + + off; + break; + case FILE_OPMINUS: + offset = (int32_t)((p->hl[1]<<24)| + (p->hl[0]<<16)| + (p->hl[3]<<8)| + (p->hl[2])) - + off; + break; + case FILE_OPMULTIPLY: + offset = (int32_t)((p->hl[1]<<24)| + (p->hl[0]<<16)| + (p->hl[3]<<8)| + (p->hl[2])) * + off; + break; + case FILE_OPDIVIDE: + offset = (int32_t)((p->hl[1]<<24)| + (p->hl[0]<<16)| + (p->hl[3]<<8)| + (p->hl[2])) / + off; + break; + case FILE_OPMODULO: + offset = (int32_t)((p->hl[1]<<24)| + (p->hl[0]<<16)| + (p->hl[3]<<8)| + (p->hl[2])) % + off; + break; + } + } else + offset = (int32_t)((p->hl[1]<<24)| + (p->hl[0]<<16)| + (p->hl[3]<<8)| + (p->hl[2])); + if (m->in_op & FILE_OPINVERSE) + offset = ~offset; + break; + case FILE_LONG: + if (nbytes < (offset + 4)) + return 0; + if (off) { + switch (m->in_op & FILE_OPS_MASK) { + case FILE_OPAND: + offset = p->l & off; + break; + case FILE_OPOR: + offset = p->l | off; + break; + case FILE_OPXOR: + offset = p->l ^ off; + break; + case FILE_OPADD: + offset = p->l + off; + break; + case FILE_OPMINUS: + offset = p->l - off; + break; + case FILE_OPMULTIPLY: + offset = p->l * off; + break; + case FILE_OPDIVIDE: + offset = p->l / off; + break; + case FILE_OPMODULO: + offset = p->l % off; + break; + } + } else + offset = p->l; + if (m->in_op & FILE_OPINVERSE) + offset = ~offset; + break; + } + + switch (cvt_flip(m->in_type, flip)) { + case FILE_LEID3: + case FILE_BEID3: + offset = ((((offset >> 0) & 0x7f) << 0) | + (((offset >> 8) & 0x7f) << 7) | + (((offset >> 16) & 0x7f) << 14) | + (((offset >> 24) & 0x7f) << 21)) + 10; + break; + default: + break; + } + + if (m->flag & INDIROFFADD) { + offset += ms->c.li[cont_level-1].off; + if ((ms->flags & MAGIC_DEBUG) != 0) + fprintf(stderr, "indirect +offs=%u\n", offset); + } + if (mcopy(ms, p, m->type, 0, s, offset, nbytes, count) == -1) + return -1; + ms->offset = offset; + + if ((ms->flags & MAGIC_DEBUG) != 0) { + mdebug(offset, (char *)(void *)p, + sizeof(union VALUETYPE)); +#ifndef COMPILE_ONLY + file_mdump(m); +#endif + } + } + + /* Verify we have enough data to match magic type */ + switch (m->type) { + case FILE_BYTE: + if (nbytes < (offset + 1)) /* should alway be true */ + return 0; + break; + + case FILE_SHORT: + case FILE_BESHORT: + case FILE_LESHORT: + if (nbytes < (offset + 2)) + return 0; + break; + + case FILE_LONG: + case FILE_BELONG: + case FILE_LELONG: + case FILE_MELONG: + case FILE_DATE: + case FILE_BEDATE: + case FILE_LEDATE: + case FILE_MEDATE: + case FILE_LDATE: + case FILE_BELDATE: + case FILE_LELDATE: + case FILE_MELDATE: + case FILE_FLOAT: + case FILE_BEFLOAT: + case FILE_LEFLOAT: + if (nbytes < (offset + 4)) + return 0; + break; + + case FILE_DOUBLE: + case FILE_BEDOUBLE: + case FILE_LEDOUBLE: + if (nbytes < (offset + 8)) + return 0; + break; + + case FILE_STRING: + case FILE_PSTRING: + case FILE_SEARCH: + if (nbytes < (offset + m->vallen)) + return 0; + break; + + case FILE_REGEX: + if (nbytes < offset) + return 0; + break; + + case FILE_INDIRECT: + if (nbytes < offset) + return 0; + sbuf = ms->o.buf; + ms->o.buf = NULL; + ms->offset = 0; + rv = file_softmagic(ms, s + offset, nbytes - offset, + BINTEST, text); + if ((ms->flags & MAGIC_DEBUG) != 0) + fprintf(stderr, "indirect @offs=%u[%d]\n", offset, rv); + if (rv == 1) { + rbuf = ms->o.buf; + ms->o.buf = sbuf; + if ((ms->flags & (MAGIC_MIME|MAGIC_APPLE)) == 0 && + file_printf(ms, m->desc, offset) == -1) + return -1; + if (file_printf(ms, "%s", rbuf) == -1) + return -1; + free(rbuf); + } else + ms->o.buf = sbuf; + return rv; + + case FILE_USE: + if (nbytes < offset) + return 0; + sbuf = m->value.s; + if (*sbuf == '^') { + sbuf++; + flip = 1; + } else + flip = 0; + if (file_magicfind(ms, sbuf, &ml) == -1) { + file_error(ms, 0, "cannot find entry `%s'", sbuf); + return -1; + } + return match(ms, ml.magic, ml.nmagic, s, nbytes, offset, + mode, text, flip, returnval); + + case FILE_NAME: + if (file_printf(ms, "%s", m->desc) == -1) + return -1; + return 1; + case FILE_DEFAULT: /* nothing to check */ + default: + break; + } + if (!mconvert(ms, m, flip)) + return 0; + return 1; +} + +private uint64_t +file_strncmp(const char *s1, const char *s2, size_t len, uint32_t flags) +{ + /* + * Convert the source args to unsigned here so that (1) the + * compare will be unsigned as it is in strncmp() and (2) so + * the ctype functions will work correctly without extra + * casting. + */ + const unsigned char *a = (const unsigned char *)s1; + const unsigned char *b = (const unsigned char *)s2; + uint64_t v; + + /* + * What we want here is v = strncmp(s1, s2, len), + * but ignoring any nulls. + */ + v = 0; + if (0L == flags) { /* normal string: do it fast */ + while (len-- > 0) + if ((v = *b++ - *a++) != '\0') + break; + } + else { /* combine the others */ + while (len-- > 0) { + if ((flags & STRING_IGNORE_LOWERCASE) && + islower(*a)) { + if ((v = tolower(*b++) - *a++) != '\0') + break; + } + else if ((flags & STRING_IGNORE_UPPERCASE) && + isupper(*a)) { + if ((v = toupper(*b++) - *a++) != '\0') + break; + } + else if ((flags & STRING_COMPACT_WHITESPACE) && + isspace(*a)) { + a++; + if (isspace(*b++)) { + if (!isspace(*a)) + while (isspace(*b)) + b++; + } + else { + v = 1; + break; + } + } + else if ((flags & STRING_COMPACT_OPTIONAL_WHITESPACE) && + isspace(*a)) { + a++; + while (isspace(*b)) + b++; + } + else { + if ((v = *b++ - *a++) != '\0') + break; + } + } + } + return v; +} + +private uint64_t +file_strncmp16(const char *a, const char *b, size_t len, uint32_t flags) +{ + /* + * XXX - The 16-bit string compare probably needs to be done + * differently, especially if the flags are to be supported. + * At the moment, I am unsure. + */ + flags = 0; + return file_strncmp(a, b, len, flags); +} + +private int +magiccheck(struct magic_set *ms, struct magic *m) +{ + uint64_t l = m->value.q; + uint64_t v; + float fl, fv; + double dl, dv; + int matched; + union VALUETYPE *p = &ms->ms_value; + + switch (m->type) { + case FILE_BYTE: + v = p->b; + break; + + case FILE_SHORT: + case FILE_BESHORT: + case FILE_LESHORT: + v = p->h; + break; + + case FILE_LONG: + case FILE_BELONG: + case FILE_LELONG: + case FILE_MELONG: + case FILE_DATE: + case FILE_BEDATE: + case FILE_LEDATE: + case FILE_MEDATE: + case FILE_LDATE: + case FILE_BELDATE: + case FILE_LELDATE: + case FILE_MELDATE: + v = p->l; + break; + + case FILE_QUAD: + case FILE_LEQUAD: + case FILE_BEQUAD: + case FILE_QDATE: + case FILE_BEQDATE: + case FILE_LEQDATE: + case FILE_QLDATE: + case FILE_BEQLDATE: + case FILE_LEQLDATE: + case FILE_QWDATE: + case FILE_BEQWDATE: + case FILE_LEQWDATE: + v = p->q; + break; + + case FILE_FLOAT: + case FILE_BEFLOAT: + case FILE_LEFLOAT: + fl = m->value.f; + fv = p->f; + switch (m->reln) { + case 'x': + matched = 1; + break; + + case '!': + matched = fv != fl; + break; + + case '=': + matched = fv == fl; + break; + + case '>': + matched = fv > fl; + break; + + case '<': + matched = fv < fl; + break; + + default: + matched = 0; + file_magerror(ms, "cannot happen with float: invalid relation `%c'", + m->reln); + return -1; + } + return matched; + + case FILE_DOUBLE: + case FILE_BEDOUBLE: + case FILE_LEDOUBLE: + dl = m->value.d; + dv = p->d; + switch (m->reln) { + case 'x': + matched = 1; + break; + + case '!': + matched = dv != dl; + break; + + case '=': + matched = dv == dl; + break; + + case '>': + matched = dv > dl; + break; + + case '<': + matched = dv < dl; + break; + + default: + matched = 0; + file_magerror(ms, "cannot happen with double: invalid relation `%c'", m->reln); + return -1; + } + return matched; + + case FILE_DEFAULT: + l = 0; + v = 0; + break; + + case FILE_STRING: + case FILE_PSTRING: + l = 0; + v = file_strncmp(m->value.s, p->s, (size_t)m->vallen, m->str_flags); + break; + + case FILE_BESTRING16: + case FILE_LESTRING16: + l = 0; + v = file_strncmp16(m->value.s, p->s, (size_t)m->vallen, m->str_flags); + break; + + case FILE_SEARCH: { /* search ms->search.s for the string m->value.s */ + size_t slen; + size_t idx; + + if (ms->search.s == NULL) + return 0; + + slen = MIN(m->vallen, sizeof(m->value.s)); + l = 0; + v = 0; + + for (idx = 0; m->str_range == 0 || idx < m->str_range; idx++) { + if (slen + idx > ms->search.s_len) + break; + + v = file_strncmp(m->value.s, ms->search.s + idx, slen, m->str_flags); + if (v == 0) { /* found match */ + ms->search.offset += idx; + break; + } + } + break; + } + case FILE_REGEX: { + int rc; + regex_t rx; + char errmsg[512]; + + if (ms->search.s == NULL) + return 0; + + l = 0; + rc = regcomp(&rx, m->value.s, + REG_EXTENDED|REG_NEWLINE| + ((m->str_flags & STRING_IGNORE_CASE) ? REG_ICASE : 0)); + if (rc) { + (void)regerror(rc, &rx, errmsg, sizeof(errmsg)); + file_magerror(ms, "regex error %d, (%s)", + rc, errmsg); + v = (uint64_t)-1; + } + else { + regmatch_t pmatch[1]; +#ifndef REG_STARTEND +#define REG_STARTEND 0 + size_t l = ms->search.s_len - 1; + char c = ms->search.s[l]; + ((char *)(intptr_t)ms->search.s)[l] = '\0'; +#else + pmatch[0].rm_so = 0; + pmatch[0].rm_eo = ms->search.s_len; +#endif + rc = regexec(&rx, (const char *)ms->search.s, + 1, pmatch, REG_STARTEND); +#if REG_STARTEND == 0 + ((char *)(intptr_t)ms->search.s)[l] = c; +#endif + switch (rc) { + case 0: + ms->search.s += (int)pmatch[0].rm_so; + ms->search.offset += (size_t)pmatch[0].rm_so; + ms->search.rm_len = + (size_t)(pmatch[0].rm_eo - pmatch[0].rm_so); + v = 0; + break; + + case REG_NOMATCH: + v = 1; + break; + + default: + (void)regerror(rc, &rx, errmsg, sizeof(errmsg)); + file_magerror(ms, "regexec error %d, (%s)", + rc, errmsg); + v = (uint64_t)-1; + break; + } + regfree(&rx); + } + if (v == (uint64_t)-1) + return -1; + break; + } + case FILE_INDIRECT: + case FILE_USE: + case FILE_NAME: + return 1; + default: + file_magerror(ms, "invalid type %d in magiccheck()", m->type); + return -1; + } + + v = file_signextend(ms, m, v); + + switch (m->reln) { + case 'x': + if ((ms->flags & MAGIC_DEBUG) != 0) + (void) fprintf(stderr, "%" INT64_T_FORMAT + "u == *any* = 1\n", (unsigned long long)v); + matched = 1; + break; + + case '!': + matched = v != l; + if ((ms->flags & MAGIC_DEBUG) != 0) + (void) fprintf(stderr, "%" INT64_T_FORMAT "u != %" + INT64_T_FORMAT "u = %d\n", (unsigned long long)v, + (unsigned long long)l, matched); + break; + + case '=': + matched = v == l; + if ((ms->flags & MAGIC_DEBUG) != 0) + (void) fprintf(stderr, "%" INT64_T_FORMAT "u == %" + INT64_T_FORMAT "u = %d\n", (unsigned long long)v, + (unsigned long long)l, matched); + break; + + case '>': + if (m->flag & UNSIGNED) { + matched = v > l; + if ((ms->flags & MAGIC_DEBUG) != 0) + (void) fprintf(stderr, "%" INT64_T_FORMAT + "u > %" INT64_T_FORMAT "u = %d\n", + (unsigned long long)v, + (unsigned long long)l, matched); + } + else { + matched = (int64_t) v > (int64_t) l; + if ((ms->flags & MAGIC_DEBUG) != 0) + (void) fprintf(stderr, "%" INT64_T_FORMAT + "d > %" INT64_T_FORMAT "d = %d\n", + (long long)v, (long long)l, matched); + } + break; + + case '<': + if (m->flag & UNSIGNED) { + matched = v < l; + if ((ms->flags & MAGIC_DEBUG) != 0) + (void) fprintf(stderr, "%" INT64_T_FORMAT + "u < %" INT64_T_FORMAT "u = %d\n", + (unsigned long long)v, + (unsigned long long)l, matched); + } + else { + matched = (int64_t) v < (int64_t) l; + if ((ms->flags & MAGIC_DEBUG) != 0) + (void) fprintf(stderr, "%" INT64_T_FORMAT + "d < %" INT64_T_FORMAT "d = %d\n", + (long long)v, (long long)l, matched); + } + break; + + case '&': + matched = (v & l) == l; + if ((ms->flags & MAGIC_DEBUG) != 0) + (void) fprintf(stderr, "((%" INT64_T_FORMAT "x & %" + INT64_T_FORMAT "x) == %" INT64_T_FORMAT + "x) = %d\n", (unsigned long long)v, + (unsigned long long)l, (unsigned long long)l, + matched); + break; + + case '^': + matched = (v & l) != l; + if ((ms->flags & MAGIC_DEBUG) != 0) + (void) fprintf(stderr, "((%" INT64_T_FORMAT "x & %" + INT64_T_FORMAT "x) != %" INT64_T_FORMAT + "x) = %d\n", (unsigned long long)v, + (unsigned long long)l, (unsigned long long)l, + matched); + break; + + default: + matched = 0; + file_magerror(ms, "cannot happen: invalid relation `%c'", + m->reln); + return -1; + } + + return matched; +} + +private int +handle_annotation(struct magic_set *ms, struct magic *m) +{ + if (ms->flags & MAGIC_APPLE) { + if (file_printf(ms, "%.8s", m->apple) == -1) + return -1; + return 1; + } + if ((ms->flags & MAGIC_MIME_TYPE) && m->mimetype[0]) { + if (file_printf(ms, "%s", m->mimetype) == -1) + return -1; + return 1; + } + return 0; +} + +private int +print_sep(struct magic_set *ms, int firstline) +{ + if (ms->flags & MAGIC_MIME) + return 0; + if (firstline) + return 0; + /* + * we found another match + * put a newline and '-' to do some simple formatting + */ + return file_printf(ms, "\n- "); +} |