/*
  *  Copyright (C) 2002 Nigel Horne <njh@bandsman.co.uk>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

  *
  * $Log: text.c,v $

  * Revision 1.10  2004/08/22 10:34:24  nigelhorne
  * Use fileblob
  *

  * Revision 1.9  2004/08/21 11:57:57  nigelhorne
  * Use line.[ch]
  *

  * Revision 1.8  2004/07/20 14:35:29  nigelhorne
  * Some MYDOOM.I were getting through
  *

  * Revision 1.7  2004/06/22 04:08:02  nigelhorne
  * Optimise empty lines
  *

  * Revision 1.6  2004/05/05 09:37:52  nigelhorne
  * Removed textClean - not needed in clamAV
  *

  * Revision 1.5  2004/03/25 22:40:46  nigelhorne
  * Removed even more calls to realloc and some duplicated code
  *

  * Revision 1.4  2004/02/26 13:26:34  nigelhorne
  * Handle spaces at the end of uuencoded lines
  *

  */
 

 static	char	const	rcsid[] = "$Id: text.c,v 1.10 2004/08/22 10:34:24 nigelhorne Exp $";

 #if HAVE_CONFIG_H
 #include "clamav-config.h"
 #endif
 

 #include <stdlib.h>
 #if	C_DARWIN
 #include <sys/types.h>
 #include <sys/malloc.h>
 #else
 #ifdef HAVE_MALLOC_H /* tk: FreeBSD-CURRENT doesn't support malloc.h */

 #ifndef	C_BSD	/* BSD now uses stdlib.h */

 #include <malloc.h>
 #endif
 #endif

 #endif

 #include <string.h>
 #include <ctype.h>
 #include <assert.h>

 #include <stdio.h>

 #include "line.h"

 #include "mbox.h"
 #include "blob.h"
 #include "text.h"
 #include "others.h"
 
 void
 textDestroy(text *t_head)
 {
 	while(t_head) {

 		text *t_next = t_head->t_next;

 		if(t_head->t_line)
 			lineUnlink(t_head->t_line);

 		free(t_head);
 		t_head = t_next;
 	}
 }
 
 /*
  * Remove trailing spaces from the lines and trailing blank lines
  */
 text *
 textClean(text *t_head)
 {

 #if	0	/* not needed in ClamAV */

 	text *t_lastnonempty = NULL, *t_ret;
 
 	while(t_head) {
 		char *line = t_head->t_text;
 		const size_t len = strlen(line);

 		int uuencoded = 0;

 		if((len > 0) && !uuencoded) {

 			int last = len;
 

 			if((strncasecmp(line, "begin ", 6) == 0) &&
 			   (isdigit(line[6])) &&
 			   (isdigit(line[7])) &&
 			   (isdigit(line[8])) &&
 			   (line[9] == ' '))
 				uuencoded = 1;
 			else
 				/*
 				 * Don't remove trailing spaces since that may
 				 * break uuencoded files
 				 */
 				while((--last >= 0) && isspace(line[last]))
 					;

 			if(++last > 0) {
 				t_lastnonempty = t_head;
 				if(last < len) {
 					line[last] = '\0';

 					t_head->t_text = cli_realloc(line, ++last);

 				}
 			} else {

 				t_head->t_text = cli_realloc(line, 1);

 				t_head->t_text[0] = '\0';
 			}
 		}
 		t_head = t_head->t_next;
 	}
 
 	if(t_lastnonempty == NULL)
 		return(NULL);	/* empty message I presume */
 
 	t_ret = t_lastnonempty;
 	t_lastnonempty = t_lastnonempty->t_next;
 
 	while(t_lastnonempty) {
 		text *t_next = t_lastnonempty->t_next;
 
 		assert(strlen(t_lastnonempty->t_text) == 0);
 
 		free(t_lastnonempty->t_text);
 		free(t_lastnonempty);
 
 		t_lastnonempty = t_next;
 	}
 
 	t_ret->t_next = NULL;
 
 	return t_ret;

 #else
 	return t_head;
 #endif

 }
 
 /* Clone the current object */
 text *
 textCopy(const text *t_head)
 {
 	text *first = NULL, *last = NULL;
 
 	while(t_head) {
 		if(first == NULL)
 			last = first = (text *)cli_malloc(sizeof(text));
 		else {
 			last->t_next = (text *)cli_malloc(sizeof(text));
 			last = last->t_next;
 		}
 
 		assert(last != NULL);
 

 		if(t_head->t_line)
 			last->t_line = lineLink(t_head->t_line);
 		else
 			last->t_line = NULL;

 
 		t_head = t_head->t_next;
 	}
 
 	if(first)
 		last->t_next = NULL;
 
 	return first;
 }
 

 /* Add a copy of a text to the end of the current object */

 text *
 textAdd(text *t_head, const text *t)
 {
 	text *ret;
 
 	if(t_head == NULL)
 		return textCopy(t);
 

 	if(t == NULL)
 		return t_head;

 	ret = t_head;

 
 	while(t_head->t_next)
 		t_head = t_head->t_next;
 
 	while(t) {
 		t_head->t_next = (text *)cli_malloc(sizeof(text));
 		t_head = t_head->t_next;
 
 		assert(t_head != NULL);
 

 		if(t->t_line)
 			t_head->t_line = lineLink(t->t_line);
 		else
 			t_head->t_line = NULL;

 
 		t = t->t_next;
 	}
 
 	t_head->t_next = NULL;
 
 	return ret;
 }
 
 /*
  * Add a message's content to the end of the current object
  */
 text *

 textAddMessage(text *aText, message *aMessage)

 {

 	assert(aMessage != NULL);
 

 	if(messageGetEncoding(aMessage) == NOENCODING)
 		return textAdd(aText, messageGetBody(aMessage));
 	else {
 		text *anotherText = messageToText(aMessage);
 
 		if(aText) {
 			aText = textAdd(aText, anotherText);
 			textDestroy(anotherText);
 			return aText;
 		}
 		return anotherText;
 	}
 }

 
 /*
  * Transfer the contents of the text into a blob
  * The caller must free the returned blob if b is NULL
  */
 blob *
 textToBlob(const text *t, blob *b)
 {
 	const text *t1;
 	size_t s = 0;
 
 	assert(t != NULL);
 
 	if(b == NULL) {
 		b = blobCreate();
 
 		if(b == NULL)
 			return NULL;
 	}
 
 	for(t1 = t; t1; t1 = t1->t_next)

 		if(t1->t_line)
 			s += strlen(lineGetData(t1->t_line)) + 1;

 		else
 			s++;

 
 	blobGrow(b, s);
 
 	do {

 		if(t->t_line) {
 			const char *l = lineGetData(t->t_line);
 
 			blobAddData(b, (unsigned char *)l, strlen(l));
 		}

 		blobAddData(b, (unsigned char *)"\n", 1);
 	} while((t = t->t_next) != NULL);
 
 	blobClose(b);
 

 	return b;

 }

 
 fileblob *
 textToFileblob(const text *t, fileblob *fb)
 {
 	assert(fb != NULL);
 	assert(t != NULL);
 
 	if(fb == NULL) {
 		fb = fileblobCreate();
 
 		if(fb == NULL)
 			return NULL;
 	}
 
 	do {
 		if(t->t_line) {
 			const char *l = lineGetData(t->t_line);
 
 			fileblobAddData(fb, (unsigned char *)l, strlen(l));
 		}
 		fileblobAddData(fb, (unsigned char *)"\n", 1);
 	} while((t = t->t_next) != NULL);
 
 	return fb;
 }