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- /*
- * Copyright (c) Christos Zoulas 2003.
- * All Rights Reserved.
- *
- * 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.
- */
- #include "file.h"
- #include "magic.h"
- #include <stdarg.h>
- #include <stdlib.h>
- #include <string.h>
- #include <ctype.h>
- #ifndef lint
- FILE_RCSID("@(#)$Id: funcs.c,v 1.13 2004/09/11 19:15:57 christos Exp $")
- #endif /* lint */
- /*
- * Like printf, only we print to a buffer and advance it.
- */
- protected int
- file_printf(struct magic_set *ms, const char *fmt, ...)
- {
- va_list ap;
- size_t len;
- char *buf;
- va_start(ap, fmt);
- if ((len = vsnprintf(ms->o.ptr, ms->o.len, fmt, ap)) >= ms->o.len) {
- va_end(ap);
- if ((buf = realloc(ms->o.buf, len + 1024)) == NULL) {
- file_oomem(ms);
- return -1;
- }
- ms->o.ptr = buf + (ms->o.ptr - ms->o.buf);
- ms->o.buf = buf;
- ms->o.len = ms->o.size - (ms->o.ptr - ms->o.buf);
- ms->o.size = len + 1024;
- va_start(ap, fmt);
- len = vsnprintf(ms->o.ptr, ms->o.len, fmt, ap);
- }
- ms->o.ptr += len;
- ms->o.len -= len;
- va_end(ap);
- return 0;
- }
- /*
- * error - print best error message possible
- */
- /*VARARGS*/
- protected void
- file_error(struct magic_set *ms, int error, const char *f, ...)
- {
- va_list va;
- /* Only the first error is ok */
- if (ms->haderr)
- return;
- va_start(va, f);
- (void)vsnprintf(ms->o.buf, ms->o.size, f, va);
- va_end(va);
- if (error > 0) {
- size_t len = strlen(ms->o.buf);
- (void)snprintf(ms->o.buf + len, ms->o.size - len, " (%s)",
- strerror(error));
- }
- ms->haderr++;
- ms->error = error;
- }
- protected void
- file_oomem(struct magic_set *ms)
- {
- file_error(ms, errno, "cannot allocate memory");
- }
- protected void
- file_badseek(struct magic_set *ms)
- {
- file_error(ms, errno, "error seeking");
- }
- protected void
- file_badread(struct magic_set *ms)
- {
- file_error(ms, errno, "error reading");
- }
- #ifndef COMPILE_ONLY
- protected int
- file_buffer(struct magic_set *ms, const void *buf, size_t nb)
- {
- int m;
- /* try compression stuff */
- if ((m = file_zmagic(ms, buf, nb)) == 0) {
- /* Check if we have a tar file */
- if ((m = file_is_tar(ms, buf, nb)) == 0) {
- /* try tests in /etc/magic (or surrogate magic file) */
- if ((m = file_softmagic(ms, buf, nb)) == 0) {
- /* try known keywords, check whether it is ASCII */
- if ((m = file_ascmagic(ms, buf, nb)) == 0) {
- /* abandon hope, all ye who remain here */
- if (file_printf(ms, ms->flags & MAGIC_MIME ?
- "application/octet-stream" : "data") == -1)
- return -1;
- m = 1;
- }
- }
- }
- }
- return m;
- }
- #endif
- protected int
- file_reset(struct magic_set *ms)
- {
- if (ms->mlist == NULL) {
- file_error(ms, 0, "no magic files loaded");
- return -1;
- }
- ms->o.ptr = ms->o.buf;
- ms->haderr = 0;
- ms->error = -1;
- return 0;
- }
- protected const char *
- file_getbuffer(struct magic_set *ms)
- {
- char *nbuf, *op, *np;
- size_t nsize;
- if (ms->haderr)
- return NULL;
- if (ms->flags & MAGIC_RAW)
- return ms->o.buf;
- nsize = ms->o.len * 4 + 1;
- if (ms->o.psize < nsize) {
- if ((nbuf = realloc(ms->o.pbuf, nsize)) == NULL) {
- file_oomem(ms);
- return NULL;
- }
- ms->o.psize = nsize;
- ms->o.pbuf = nbuf;
- }
- for (np = ms->o.pbuf, op = ms->o.buf; *op; op++) {
- if (isprint((unsigned char)*op)) {
- *np++ = *op;
- } else {
- *np++ = '\\';
- *np++ = ((*op >> 6) & 3) + '0';
- *np++ = ((*op >> 3) & 7) + '0';
- *np++ = ((*op >> 0) & 7) + '0';
- }
- }
- *np = '\0';
- return ms->o.pbuf;
- }
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