gnupg/g10/filter.h

/* filter.h
 *	Copyright (C) 1998, 1999, 2000 Free Software Foundation, Inc.
 *
 * This file is part of GnuPG.
 *
 * GnuPG 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.
 *
 * GnuPG 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */
#ifndef GPG_FILTER_H
#define GPG_FILTER_H

#include <gcrypt.h>

#include "basicdefs.h"
#include "iobuf.h"


typedef struct {
    GCRY_MD_HD md;	/* catch all */
    GCRY_MD_HD md2;	/* if we want to calculate an alternate hash */
    size_t maxbuf_size;
} md_filter_context_t;

typedef struct {
    /* these fields may be initialized */
    int what;		    /* what kind of armor headers to write */
    int only_keyblocks;     /* skip all headers but ".... key block" */
    const char *hdrlines;   /* write these headerlines */

    /* these fileds must be initialized to zero */
    int no_openpgp_data;    /* output flag: "No valid OpenPGP data found" */

    /* the following fields must be initialized to zero */
    int inp_checked;	    /* set if the input has been checked */
    int inp_bypass;	    /* set if the input is not armored */
    int in_cleartext;	    /* clear text message */
    int not_dash_escaped;   /* clear text is not dash escaped */
    int hashes; 	    /* detected hash algorithms */
    int faked;		    /* we are faking a literal data packet */
    int truncated;	    /* number of truncated lines */
    int qp_detected;
    int pgp2mode;

    byte *buffer;	    /* malloced buffer */
    unsigned buffer_size;   /* and size of this buffer */
    unsigned buffer_len;    /* used length of the buffer */
    unsigned buffer_pos;    /* read position */

    byte radbuf[4];
    int idx, idx2;
    u32 crc;

    int status; 	    /* an internal state flag */
    int cancel;
    int any_data;	    /* any valid armored data seen */
    int pending_lf;	    /* used together with faked */
} armor_filter_context_t;


typedef struct {
    int status;
    void *opaque;   /* (used for z_stream) */
    byte *inbuf;
    unsigned inbufsize;
    byte *outbuf;
    unsigned outbufsize;
    int algo;	 /* compress algo */
    int algo1hack;
} compress_filter_context_t;


typedef struct {
    DEK *dek;
    u32 datalen;
    GCRY_CIPHER_HD cipher_hd;
    int header;
    GCRY_MD_HD mdc_hash;
    byte enchash[20];
    int create_mdc; /* flag will be set by the cipher filter */
} cipher_filter_context_t;


typedef struct {
    int header_okay;
    PK_LIST pk_list;
    cipher_filter_context_t cfx;
} encrypt_filter_context_t;


typedef struct {
    byte *buffer;	    /* malloced buffer */
    unsigned buffer_size;   /* and size of this buffer */
    unsigned buffer_len;    /* used length of the buffer */
    unsigned buffer_pos;    /* read position */
    int truncated;	    /* number of truncated lines */
    int not_dash_escaped;
    int escape_from;
    GCRY_MD_HD md;
    int pending_lf;
    int pending_esc;
} text_filter_context_t;


/*-- mdfilter.c --*/
int md_filter( void *opaque, int control, IOBUF a, byte *buf, size_t *ret_len);
void free_md_filter_context( md_filter_context_t *mfx );

/*-- armor.c --*/
int use_armor_filter( IOBUF a );
int armor_filter( void *opaque, int control,
		  IOBUF chain, byte *buf, size_t *ret_len);

/*-- compress.c --*/
int compress_filter( void *opaque, int control,
		     IOBUF chain, byte *buf, size_t *ret_len);

/*-- cipher.c --*/
int cipher_filter( void *opaque, int control,
		   IOBUF chain, byte *buf, size_t *ret_len);

/*-- textfilter.c --*/
int text_filter( void *opaque, int control,
		 IOBUF chain, byte *buf, size_t *ret_len);
int copy_clearsig_text( IOBUF out, IOBUF inp, GCRY_MD_HD md,
			  int escape_dash, int escape_from, int pgp2mode );



#endif /*GPG_FILTER_H*/