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/* $OpenBSD: text.c,v 1.3 2017/04/18 14:16:48 nicm Exp $ */
/*
* Copyright (c) 2015 Nicholas Marriott <nicm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include "file.h"
#include "magic.h"
#include "xmalloc.h"
static const char *text_words[][3] = {
{ "msgid", "PO (gettext message catalogue)", "text/x-po" },
{ "dnl", "M4 macro language pre-processor", "text/x-m4" },
{ "import", "Java program", "text/x-java" },
{ "\"libhdr\"", "BCPL program", "text/x-bcpl" },
{ "\"LIBHDR\"", "BCPL program", "text/x-bcpl" },
{ "//", "C++ program", "text/x-c++" },
{ "virtual", "C++ program", "text/x-c++" },
{ "class", "C++ program", "text/x-c++" },
{ "public:", "C++ program", "text/x-c++" },
{ "private:", "C++ program", "text/x-c++" },
{ "/*", "C program", "text/x-c" },
{ "#include", "C program", "text/x-c" },
{ "char", "C program", "text/x-c" },
{ "The", "English", "text/plain" },
{ "the", "English", "text/plain" },
{ "double", "C program", "text/x-c" },
{ "extern", "C program", "text/x-c" },
{ "float", "C program", "text/x-c" },
{ "struct", "C program", "text/x-c" },
{ "union", "C program", "text/x-c" },
{ "CFLAGS", "make commands", "text/x-makefile" },
{ "LDFLAGS", "make commands", "text/x-makefile" },
{ "all:", "make commands", "text/x-makefile" },
{ ".PRECIOUS", "make commands", "text/x-makefile" },
{ ".ascii", "assembler program", "text/x-asm" },
{ ".asciiz", "assembler program", "text/x-asm" },
{ ".byte", "assembler program", "text/x-asm" },
{ ".even", "assembler program", "text/x-asm" },
{ ".globl", "assembler program", "text/x-asm" },
{ ".text", "assembler program", "text/x-asm" },
{ "clr", "assembler program", "text/x-asm" },
{ "(input", "Pascal program", "text/x-pascal" },
{ "program", "Pascal program", "text/x-pascal" },
{ "record", "Pascal program", "text/x-pascal" },
{ "dcl", "PL/1 program", "text/x-pl1" },
{ "Received:", "mail", "text/x-mail" },
{ ">From", "mail", "text/x-mail" },
{ "Return-Path:", "mail", "text/x-mail" },
{ "Cc:", "mail", "text/x-mail" },
{ "Newsgroups:", "news", "text/x-news" },
{ "Path:", "news", "text/x-news" },
{ "Organization:", "news", "text/x-news" },
{ "href=", "HTML document", "text/html" },
{ "HREF=", "HTML document", "text/html" },
{ "<body", "HTML document", "text/html" },
{ "<BODY", "HTML document", "text/html" },
{ "<html", "HTML document", "text/html" },
{ "<HTML", "HTML document", "text/html" },
{ "<!--", "HTML document", "text/html" },
{ NULL, NULL, NULL }
};
static int
text_is_ascii(u_char c)
{
const char cc[] = "\007\010\011\012\014\015\033";
if (c == '\0')
return (0);
if (strchr(cc, c) != NULL)
return (1);
return (c > 31 && c < 127);
}
static int
text_is_latin1(u_char c)
{
if (c >= 160)
return (1);
return (text_is_ascii(c));
}
static int
text_is_extended(u_char c)
{
if (c >= 128)
return (1);
return (text_is_ascii(c));
}
static int
text_try_test(const void *base, size_t size, int (*f)(u_char))
{
const u_char *data = base;
size_t offset;
for (offset = 0; offset < size; offset++) {
if (!f(data[offset]))
return (0);
}
return (1);
}
const char *
text_get_type(const void *base, size_t size)
{
if (text_try_test(base, size, text_is_ascii))
return ("ASCII");
if (text_try_test(base, size, text_is_latin1))
return ("ISO-8859");
if (text_try_test(base, size, text_is_extended))
return ("Non-ISO extended-ASCII");
return (NULL);
}
const char *
text_try_words(const void *base, size_t size, int flags)
{
const char *cp, *end, *next, *word;
size_t wordlen;
u_int i;
end = (const char *)base + size;
for (cp = base; cp != end; /* nothing */) {
while (cp != end && isspace((u_char)*cp))
cp++;
next = cp;
while (next != end && !isspace((u_char)*next))
next++;
for (i = 0; /* nothing */; i++) {
word = text_words[i][0];
if (word == NULL)
break;
wordlen = strlen(word);
if ((size_t)(next - cp) != wordlen)
continue;
if (memcmp(cp, word, wordlen) != 0)
continue;
if (flags & MAGIC_TEST_MIME)
return (text_words[i][2]);
return (text_words[i][1]);
}
cp = next;
}
return (NULL);
}
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