#ifndef	H_RPMIO_INTERNAL
#define	H_RPMIO_INTERNAL

/** \ingroup rpmio
 * \file rpmio/rpmio_internal.h
 */


#include <rpmio.h>
#include <rpmurl.h>

#if HAVE_BEECRYPT_API_H
#include <beecrypt/api.h>
#else
#include <beecrypt/beecrypt.api.h>
#endif

#include <rpmpgp.h>
#include <rpmsw.h>

/* Drag in the beecrypt includes. */
#include <beecrypt/beecrypt.h>
#include <beecrypt/base64.h>
#include <beecrypt/dsa.h>
#include <beecrypt/endianness.h>
#include <beecrypt/md5.h>
#include <beecrypt/mp.h>
#include <beecrypt/rsa.h>
#include <beecrypt/rsapk.h>
#include <beecrypt/sha1.h>
#if HAVE_BEECRYPT_API_H
#include <beecrypt/sha256.h>
#include <beecrypt/sha384.h>
#include <beecrypt/sha512.h>
#endif

/** \ingroup rpmio
 * Values parsed from OpenPGP signature/pubkey packet(s).
 */
struct pgpDigParams_s {
    const char * userid;
    const byte * hash;
    const char * params[4];
    byte tag;

    byte version;		/*!< version number. */
    byte time[4];		/*!< time that the key was created. */
    byte pubkey_algo;		/*!< public key algorithm. */

    byte hash_algo;
    byte sigtype;
    byte hashlen;
    byte signhash16[2];
    byte signid[8];
    byte saved;
#define	PGPDIG_SAVED_TIME	(1 << 0)
#define	PGPDIG_SAVED_ID		(1 << 1)

};

/** \ingroup rpmio
 * Container for values parsed from an OpenPGP signature and public key.
 */
struct pgpDig_s {
    struct pgpDigParams_s signature;
    struct pgpDigParams_s pubkey;

    size_t nbytes;		/*!< No. bytes of plain text. */

    DIGEST_CTX sha1ctx;		/*!< (dsa) sha1 hash context. */
    DIGEST_CTX hdrsha1ctx;	/*!< (dsa) header sha1 hash context. */
    void * sha1;		/*!< (dsa) V3 signature hash. */
    size_t sha1len;		/*!< (dsa) V3 signature hash length. */

    DIGEST_CTX md5ctx;		/*!< (rsa) md5 hash context. */
    DIGEST_CTX hdrmd5ctx;	/*!< (rsa) header md5 hash context. */
    void * md5;			/*!< (rsa) V3 signature hash. */
    size_t md5len;		/*!< (rsa) V3 signature hash length. */

    /* DSA parameters. */
    mpbarrett p;
    mpbarrett q;
    mpnumber g;
    mpnumber y;
    mpnumber hm;
    mpnumber r;
    mpnumber s;

    /* RSA parameters. */
    rsapk rsa_pk;
    mpnumber m;
    mpnumber c;
    mpnumber rsahm;
};

/** \ingroup rpmio
 */
typedef struct _FDSTACK_s {
    FDIO_t		io;
    void *		fp;
    int			fdno;
} FDSTACK_t;

/** \ingroup rpmio
 * Identify per-desciptor I/O operation statistics.
 */
typedef enum fdOpX_e {
    FDSTAT_READ		= 0,	/*!< Read statistics index. */
    FDSTAT_WRITE	= 1,	/*!< Write statistics index. */
    FDSTAT_SEEK		= 2,	/*!< Seek statistics index. */
    FDSTAT_CLOSE	= 3,	/*!< Close statistics index */
    FDSTAT_DIGEST	= 4,	/*!< Digest statistics index. */
    FDSTAT_MAX		= 5
} fdOpX;

/** \ingroup rpmio
 * Cumulative statistics for a descriptor.
 */
typedef	struct {
    struct rpmop_s	ops[FDSTAT_MAX];	/*!< Cumulative statistics. */
} * FDSTAT_t;

/** \ingroup rpmio
 */
typedef struct _FDDIGEST_s {
    pgpHashAlgo		hashalgo;
    DIGEST_CTX		hashctx;
} * FDDIGEST_t;

/** \ingroup rpmio
 * The FD_t File Handle data structure.
 */
struct _FD_s {
    int		nrefs;
    int		flags;
#define	RPMIO_DEBUG_IO		0x40000000
#define	RPMIO_DEBUG_REFS	0x20000000
    int		magic;
#define	FDMAGIC			0x04463138
    int		nfps;
    FDSTACK_t	fps[8];
    int		urlType;	/* ufdio: */

    int		rd_timeoutsecs;	/* ufdRead: per FD_t timer */
    ssize_t	bytesRemain;	/* ufdio: */
    ssize_t	contentLength;	/* ufdio: */
    int		persist;	/* ufdio: */
    int		wr_chunked;	/* ufdio: */

    int		syserrno;	/* last system errno encountered */
    const void *errcookie;	/* gzdio/bzdio/ufdio: */

    FDSTAT_t	stats;		/* I/O statistics */

    int		ndigests;
#define	FDDIGEST_MAX	4
    struct _FDDIGEST_s	digests[FDDIGEST_MAX];

    unsigned int firstFree;	/* fadio: */
    long int	fileSize;	/* fadio: */
    long int	fd_cpioPos;	/* cpio: */
};

#define	FDSANE(fd)	assert(fd && fd->magic == FDMAGIC)

extern int _rpmio_debug;

#define DBG(_f, _m, _x) \
    \
    if ((_rpmio_debug | ((_f) ? ((FD_t)(_f))->flags : 0)) & (_m)) fprintf _x \

#define DBGIO(_f, _x)   DBG((_f), RPMIO_DEBUG_IO, _x)
#define DBGREFS(_f, _x) DBG((_f), RPMIO_DEBUG_REFS, _x)

#ifdef __cplusplus
extern "C" {
#endif

/** \ingroup rpmio
 */
int fdFgets(FD_t fd, char * buf, size_t len);

/** \ingroup rpmio
 */
int ufdClose( void * cookie);

/** \ingroup rpmio
 */
static inline
FDIO_t fdGetIo(FD_t fd)
{
    FDSANE(fd);
    return fd->fps[fd->nfps].io;
}

/** \ingroup rpmio
 */
/* FIX: io may be NULL */
static inline
void fdSetIo(FD_t fd, FDIO_t io)
{
    FDSANE(fd);
    fd->fps[fd->nfps].io = io;
}

/** \ingroup rpmio
 */
static inline
FILE * fdGetFILE(FD_t fd)
{
    FDSANE(fd);
    return ((FILE *)fd->fps[fd->nfps].fp);
}

/** \ingroup rpmio
 */
static inline
void * fdGetFp(FD_t fd)
{
    FDSANE(fd);
    return fd->fps[fd->nfps].fp;
}

/** \ingroup rpmio
 */
/* FIX: fp may be NULL */
static inline
void fdSetFp(FD_t fd, void * fp)
{
    FDSANE(fd);
    fd->fps[fd->nfps].fp = fp;
}

/** \ingroup rpmio
 */
static inline
int fdGetFdno(FD_t fd)
{
    FDSANE(fd);
    return fd->fps[fd->nfps].fdno;
}

/** \ingroup rpmio
 */
static inline
void fdSetFdno(FD_t fd, int fdno)
{
    FDSANE(fd);
    fd->fps[fd->nfps].fdno = fdno;
}

/** \ingroup rpmio
 */
static inline
void fdSetContentLength(FD_t fd, ssize_t contentLength)
{
    FDSANE(fd);
    fd->contentLength = fd->bytesRemain = contentLength;
}

/** \ingroup rpmio
 */
static inline
void fdPush(FD_t fd, FDIO_t io, void * fp, int fdno)
{
    FDSANE(fd);
    if (fd->nfps >= (sizeof(fd->fps)/sizeof(fd->fps[0]) - 1))
	return;
    fd->nfps++;
    fdSetIo(fd, io);
    fdSetFp(fd, fp);
    fdSetFdno(fd, fdno);
}

/** \ingroup rpmio
 */
static inline
void fdPop(FD_t fd)
{
    FDSANE(fd);
    if (fd->nfps < 0) return;
    fdSetIo(fd, NULL);
    fdSetFp(fd, NULL);
    fdSetFdno(fd, -1);
    fd->nfps--;
}

/** \ingroup rpmio
 */
static inline
rpmop fdstat_op(FD_t fd, fdOpX opx)
{
    rpmop op = NULL;

    if (fd != NULL && fd->stats != NULL && opx >= 0 && opx < FDSTAT_MAX)
        op = fd->stats->ops + opx;
    return op;
}

/** \ingroup rpmio
 */
static inline
void fdstat_enter(FD_t fd, int opx)
{
    if (fd == NULL) return;
    if (fd->stats != NULL)
	(void) rpmswEnter(fdstat_op(fd, opx), 0);
}

/** \ingroup rpmio
 */
static inline
void fdstat_exit(FD_t fd, int opx, ssize_t rc)
{
    if (fd == NULL) return;
    if (rc == -1)
	fd->syserrno = errno;
    else if (rc > 0 && fd->bytesRemain > 0)
	switch (opx) {
	case FDSTAT_READ:
	case FDSTAT_WRITE:
	fd->bytesRemain -= rc;
	    break;
	default:
	    break;
	}
    if (fd->stats != NULL)
	(void) rpmswExit(fdstat_op(fd, opx), rc);
}

/** \ingroup rpmio
 */
static inline
void fdstat_print(FD_t fd, const char * msg, FILE * fp)
{
    static int usec_scale = (1000*1000);
    int opx;

    if (fd == NULL || fd->stats == NULL) return;
    for (opx = 0; opx < 4; opx++) {
	rpmop op = &fd->stats->ops[opx];
	if (op->count <= 0) continue;
	switch (opx) {
	case FDSTAT_READ:
	    if (msg) fprintf(fp, "%s:", msg);
	    fprintf(fp, "%8d reads, %8ld total bytes in %d.%06d secs\n",
		op->count, (long)op->bytes,
		(int)(op->usecs/usec_scale), (int)(op->usecs%usec_scale));
	    break;
	case FDSTAT_WRITE:
	    if (msg) fprintf(fp, "%s:", msg);
	    fprintf(fp, "%8d writes, %8ld total bytes in %d.%06d secs\n",
		op->count, (long)op->bytes,
		(int)(op->usecs/usec_scale), (int)(op->usecs%usec_scale));
	    break;
	case FDSTAT_SEEK:
	    break;
	case FDSTAT_CLOSE:
	    break;
	}
    }
}

/** \ingroup rpmio
 */
static inline
void fdSetSyserrno(FD_t fd, int syserrno, const void * errcookie)
{
    FDSANE(fd);
    fd->syserrno = syserrno;
    fd->errcookie = errcookie;
}

/** \ingroup rpmio
 */
static inline
int fdGetRdTimeoutSecs(FD_t fd)
{
    FDSANE(fd);
    return fd->rd_timeoutsecs;
}

/** \ingroup rpmio
 */
static inline
long int fdGetCpioPos(FD_t fd)
{
    FDSANE(fd);
    return fd->fd_cpioPos;
}

/** \ingroup rpmio
 */
static inline
void fdSetCpioPos(FD_t fd, long int cpioPos)
{
    FDSANE(fd);
    fd->fd_cpioPos = cpioPos;
}

/** \ingroup rpmio
 */
static inline
FD_t c2f(void * cookie)
{
    FD_t fd = (FD_t) cookie;
    FDSANE(fd);
    return fd;
}

/** \ingroup rpmio
 * Attach digest to fd.
 */
static inline
void fdInitDigest(FD_t fd, pgpHashAlgo hashalgo, int flags)
{
    FDDIGEST_t fddig = fd->digests + fd->ndigests;
    if (fddig != (fd->digests + FDDIGEST_MAX)) {
	fd->ndigests++;
	fddig->hashalgo = hashalgo;
	fdstat_enter(fd, FDSTAT_DIGEST);
	fddig->hashctx = rpmDigestInit(hashalgo, flags);
	fdstat_exit(fd, FDSTAT_DIGEST, 0);
    }
}

/** \ingroup rpmio
 * Update digest(s) attached to fd.
 */
static inline
void fdUpdateDigests(FD_t fd, const unsigned char * buf, ssize_t buflen)
{
    int i;

    if (buf != NULL && buflen > 0)
    for (i = fd->ndigests - 1; i >= 0; i--) {
	FDDIGEST_t fddig = fd->digests + i;
	if (fddig->hashctx == NULL)
	    continue;
	fdstat_enter(fd, FDSTAT_DIGEST);
	(void) rpmDigestUpdate(fddig->hashctx, buf, buflen);
	fdstat_exit(fd, FDSTAT_DIGEST, buflen);
    }
}

/** \ingroup rpmio
 */
static inline
void fdFiniDigest(FD_t fd, pgpHashAlgo hashalgo,
		void ** datap,
		size_t * lenp,
		int asAscii)
{
    int imax = -1;
    int i;

    for (i = fd->ndigests - 1; i >= 0; i--) {
	FDDIGEST_t fddig = fd->digests + i;
	if (fddig->hashctx == NULL)
	    continue;
	if (i > imax) imax = i;
	if (fddig->hashalgo != hashalgo)
	    continue;
	fdstat_enter(fd, FDSTAT_DIGEST);
	(void) rpmDigestFinal(fddig->hashctx, datap, lenp, asAscii);
	fdstat_exit(fd, FDSTAT_DIGEST, 0);
	fddig->hashctx = NULL;
	break;
    }
    if (i < 0) {
	if (datap) *datap = NULL;
	if (lenp) *lenp = 0;
    }

    fd->ndigests = imax;
    if (i < imax)
	fd->ndigests++;		/* convert index to count */
}

/**
 * Read an entire file into a buffer.
 * @param fn		file name to read
 * @retval *bp		(malloc'd) buffer address
 * @retval *blenp	(malloc'd) buffer length
 * @return		0 on success
 */
int rpmioSlurp(const char * fn,
                byte ** bp, ssize_t * blenp);

#ifdef __cplusplus
}
#endif

#endif	/* H_RPMIO_INTERNAL */