265 lines
6.1 KiB
C
265 lines
6.1 KiB
C
/*
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* Copyright (c) Christos Zoulas 2003.
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* All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "file.h"
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#include "magic.h"
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#if defined(HAVE_WCHAR_H)
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#include <wchar.h>
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#endif
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#ifndef lint
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FILE_RCSID("@(#)$Id: funcs.c,v 1.19 2006/03/02 22:10:26 christos Exp $")
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#endif /* lint */
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#ifndef HAVE_VSNPRINTF
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int vsnprintf(char *, size_t, const char *, va_list);
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#endif
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/*
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* Like printf, only we print to a buffer and advance it.
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*/
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protected int
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file_printf(struct magic_set *ms, const char *fmt, ...)
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{
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va_list ap;
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size_t len;
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char *buf;
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va_start(ap, fmt);
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if ((len = vsnprintf(ms->o.ptr, ms->o.len, fmt, ap)) >= ms->o.len) {
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va_end(ap);
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if ((buf = realloc(ms->o.buf, len + 1024)) == NULL) {
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file_oomem(ms);
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return -1;
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}
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ms->o.ptr = buf + (ms->o.ptr - ms->o.buf);
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ms->o.buf = buf;
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ms->o.len = ms->o.size - (ms->o.ptr - ms->o.buf);
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ms->o.size = len + 1024;
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va_start(ap, fmt);
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len = vsnprintf(ms->o.ptr, ms->o.len, fmt, ap);
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}
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ms->o.ptr += len;
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ms->o.len -= len;
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va_end(ap);
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return 0;
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}
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/*
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* error - print best error message possible
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*/
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/*VARARGS*/
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protected void
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file_error(struct magic_set *ms, int error, const char *f, ...)
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{
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va_list va;
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/* Only the first error is ok */
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if (ms->haderr)
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return;
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va_start(va, f);
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(void)vsnprintf(ms->o.buf, ms->o.size, f, va);
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va_end(va);
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if (error > 0) {
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size_t len = strlen(ms->o.buf);
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(void)snprintf(ms->o.buf + len, ms->o.size - len, " (%s)",
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strerror(error));
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}
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ms->haderr++;
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ms->error = error;
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}
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protected void
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file_oomem(struct magic_set *ms)
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{
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file_error(ms, errno, "cannot allocate memory");
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}
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protected void
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file_badseek(struct magic_set *ms)
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{
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file_error(ms, errno, "error seeking");
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}
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protected void
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file_badread(struct magic_set *ms)
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{
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file_error(ms, errno, "error reading");
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}
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#ifndef COMPILE_ONLY
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protected int
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file_buffer(struct magic_set *ms, int fd, const void *buf, size_t nb)
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{
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int m;
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/* try compression stuff */
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if ((m = file_zmagic(ms, fd, buf, nb)) == 0) {
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/* Check if we have a tar file */
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if ((m = file_is_tar(ms, buf, nb)) == 0) {
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/* try tests in /etc/magic (or surrogate magic file) */
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if ((m = file_softmagic(ms, buf, nb)) == 0) {
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/* try known keywords, check whether it is ASCII */
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if ((m = file_ascmagic(ms, buf, nb)) == 0) {
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/* abandon hope, all ye who remain here */
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if (file_printf(ms, ms->flags & MAGIC_MIME ?
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(nb ? "application/octet-stream" :
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"application/empty") :
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(nb ? "data" :
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"empty")) == -1)
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return -1;
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m = 1;
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}
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}
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}
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}
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return m;
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}
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#endif
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protected int
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file_reset(struct magic_set *ms)
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{
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if (ms->mlist == NULL) {
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file_error(ms, 0, "no magic files loaded");
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return -1;
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}
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ms->o.ptr = ms->o.buf;
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ms->haderr = 0;
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ms->error = -1;
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return 0;
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}
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#define OCTALIFY(n, o) \
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*(n)++ = '\\', \
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*(n)++ = (((uint32_t)*(o) >> 6) & 3) + '0', \
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*(n)++ = (((uint32_t)*(o) >> 3) & 7) + '0', \
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*(n)++ = (((uint32_t)*(o) >> 0) & 7) + '0', \
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(o)++
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protected const char *
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file_getbuffer(struct magic_set *ms)
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{
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char *nbuf, *op, *np;
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size_t nsize;
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if (ms->haderr)
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return NULL;
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if (ms->flags & MAGIC_RAW)
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return ms->o.buf;
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nsize = ms->o.len * 4 + 1;
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if (ms->o.psize < nsize) {
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if ((nbuf = realloc(ms->o.pbuf, nsize)) == NULL) {
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file_oomem(ms);
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return NULL;
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}
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ms->o.psize = nsize;
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ms->o.pbuf = nbuf;
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}
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#if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
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{
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mbstate_t state;
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wchar_t nextchar;
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int mb_conv = 1;
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size_t bytesconsumed;
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char *eop;
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(void)memset(&state, 0, sizeof(mbstate_t));
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np = ms->o.pbuf;
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op = ms->o.buf;
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eop = op + strlen(ms->o.buf);
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while (op < eop) {
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bytesconsumed = mbrtowc(&nextchar, op, eop - op,
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&state);
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if (bytesconsumed == (size_t)(-1) ||
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bytesconsumed == (size_t)(-2)) {
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mb_conv = 0;
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break;
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}
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if (iswprint(nextchar) ) {
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(void)memcpy(np, op, bytesconsumed);
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op += bytesconsumed;
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np += bytesconsumed;
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} else {
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while (bytesconsumed-- > 0)
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OCTALIFY(np, op);
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}
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}
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*np = '\0';
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/* Parsing succeeded as a multi-byte sequence */
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if (mb_conv != 0)
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return ms->o.pbuf;
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}
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#endif
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for (np = ms->o.pbuf, op = ms->o.buf; *op; op++) {
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if (isprint((unsigned char)*op)) {
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*np++ = *op;
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} else {
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OCTALIFY(np, op);
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}
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}
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*np = '\0';
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return ms->o.pbuf;
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}
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/*
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* Yes these suffer from buffer overflows, but if your OS does not have
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* these functions, then maybe you should consider replacing your OS?
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*/
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#ifndef HAVE_VSNPRINTF
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int
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vsnprintf(char *buf, size_t len, const char *fmt, va_list ap)
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{
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return vsprintf(buf, fmt, ap);
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}
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#endif
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#ifndef HAVE_SNPRINTF
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/*ARGSUSED*/
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int
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snprintf(char *buf, size_t len, const char *fmt, ...)
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{
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int rv;
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va_list ap;
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va_start(ap, fmt);
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rv = vsprintf(buf, fmt, ap);
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va_end(ap);
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return rv;
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}
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#endif
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