Virgin import of Christos Zoulas's FILE 4.10.

*- file is now broken into a library containing and processing the magic
   and a consumer binary.

1 files changed, 186 insertions, 0 deletions

diff --git a/contrib/file/funcs.c b/contrib/file/funcs.c
new file mode 100644
index 0000000..44cbdf1
--- /dev/null
+++ b/contrib/file/funcs.c
@@ -0,0 +1,186 @@
+/*
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *  
+ * 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 1.12 2004/06/04 14:40:20 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;
+}