/*
 * Copyright (c) 2004-2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
#include <asn_internal.h>
#include <ANY.h>
#include <errno.h>

asn_OCTET_STRING_specifics_t asn_SPC_ANY_specs = {
	sizeof(ANY_t),
	offsetof(ANY_t, _asn_ctx),
	ASN_OSUBV_ANY
};
asn_TYPE_operation_t asn_OP_ANY = {
	OCTET_STRING_free,
	OCTET_STRING_print,
	OCTET_STRING_compare,
	OCTET_STRING_decode_ber,
	OCTET_STRING_encode_der,
	OCTET_STRING_decode_xer_hex,
	ANY_encode_xer,
#ifdef	ASN_DISABLE_OER_SUPPORT
	0,
	0,
#else
	0,
	0,
#endif  /* ASN_DISABLE_OER_SUPPORT */
#ifdef	ASN_DISABLE_PER_SUPPORT
	0, 0,
#else
	ANY_decode_uper,
	ANY_encode_uper,
#endif  /* ASN_DISABLE_PER_SUPPORT */
	0	/* Use generic outmost tag fetcher */
};
asn_TYPE_descriptor_t asn_DEF_ANY = {
	"ANY",
	"ANY",
	&asn_OP_ANY,
	asn_generic_no_constraint,
	0, 0, 0, 0,
	0,	/* No OER visible constraints */
	0,	/* No PER visible constraints */
	0, 0,	/* No members */
	&asn_SPC_ANY_specs,
};

#undef RETURN
#define RETURN(_code)                       \
    do {                                    \
        asn_dec_rval_t tmprval;             \
        tmprval.code = _code;               \
        tmprval.consumed = consumed_myself; \
        return tmprval;                     \
    } while(0)

asn_enc_rval_t
ANY_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
	int ilevel, enum xer_encoder_flags_e flags,
		asn_app_consume_bytes_f *cb, void *app_key) {

	if(flags & XER_F_CANONICAL) {
		/*
		 * Canonical XER-encoding of ANY type is not supported.
		 */
		ASN__ENCODE_FAILED;
	}

	/* Dump as binary */
	return OCTET_STRING_encode_xer(td, sptr, ilevel, flags, cb, app_key);
}

struct _callback_arg {
	uint8_t *buffer;
	size_t offset;
	size_t size;
};

static int ANY__consume_bytes(const void *buffer, size_t size, void *key);

int
ANY_fromType(ANY_t *st, asn_TYPE_descriptor_t *td, void *sptr) {
	struct _callback_arg arg;
	asn_enc_rval_t erval;

	if(!st || !td) {
		errno = EINVAL;
		return -1;
	}

	if(!sptr) {
		if(st->buf) FREEMEM(st->buf);
		st->size = 0;
		return 0;
	}

	arg.offset = arg.size = 0;
	arg.buffer = 0;

	erval = der_encode(td, sptr, ANY__consume_bytes, &arg);
	if(erval.encoded == -1) {
		if(arg.buffer) FREEMEM(arg.buffer);
		return -1;
	}
	assert((size_t)erval.encoded == arg.offset);

	if(st->buf) FREEMEM(st->buf);
	st->buf = arg.buffer;
	st->size = arg.offset;

	return 0;
}

ANY_t *
ANY_new_fromType(asn_TYPE_descriptor_t *td, void *sptr) {
	ANY_t tmp;
	ANY_t *st;

	if(!td || !sptr) {
		errno = EINVAL;
		return 0;
	}

	memset(&tmp, 0, sizeof(tmp));

	if(ANY_fromType(&tmp, td, sptr)) return 0;

	st = (ANY_t *)CALLOC(1, sizeof(ANY_t));
	if(st) {
		*st = tmp;
		return st;
	} else {
		FREEMEM(tmp.buf);
		return 0;
	}
}

int
ANY_to_type(ANY_t *st, asn_TYPE_descriptor_t *td, void **struct_ptr) {
	asn_dec_rval_t rval;
	void *newst = 0;

	if(!st || !td || !struct_ptr) {
		errno = EINVAL;
		return -1;
	}

	if(st->buf == 0) {
		/* Nothing to convert, make it empty. */
		*struct_ptr = (void *)0;
		return 0;
	}

	rval = ber_decode(0, td, (void **)&newst, st->buf, st->size);
	if(rval.code == RC_OK) {
		*struct_ptr = newst;
		return 0;
	} else {
		/* Remove possibly partially decoded data. */
		ASN_STRUCT_FREE(*td, newst);
		return -1;
	}
}

static int ANY__consume_bytes(const void *buffer, size_t size, void *key) {
	struct _callback_arg *arg = (struct _callback_arg *)key;

	if((arg->offset + size) >= arg->size) {
		size_t nsize = (arg->size ? arg->size << 2 : 16) + size;
		void *p = REALLOC(arg->buffer, nsize);
		if(!p) return -1;
		arg->buffer = (uint8_t *)p;
		arg->size = nsize;
	}

	memcpy(arg->buffer + arg->offset, buffer, size);
	arg->offset += size;
	assert(arg->offset < arg->size);

	return 0;
}

#ifndef ASN_DISABLE_PER_SUPPORT

asn_dec_rval_t
ANY_decode_uper(const asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
                const asn_per_constraints_t *constraints, void **sptr,
                asn_per_data_t *pd) {
    asn_OCTET_STRING_specifics_t *specs =
        td->specifics ? (asn_OCTET_STRING_specifics_t *)td->specifics
                      : &asn_SPC_ANY_specs;
    size_t consumed_myself = 0;
    int repeat;
    ANY_t *st = (ANY_t *)*sptr;

    (void)opt_codec_ctx;
    (void)constraints;

    /*
     * Allocate the structure.
     */
    if(!st) {
        st = (ANY_t *)(*sptr = CALLOC(1, specs->struct_size));
        if(!st) RETURN(RC_FAIL);
    }

    ASN_DEBUG("PER Decoding ANY type");


    st->size = 0;
    do {
        ssize_t raw_len;
        ssize_t len_bytes;
        ssize_t len_bits;
        void *p;
        int ret;

        /* Get the PER length */
        raw_len = uper_get_length(pd, -1, &repeat);
        if(raw_len < 0) RETURN(RC_WMORE);

        ASN_DEBUG("Got PER length len %zu, %s (%s)", raw_len,
                  repeat ? "repeat" : "once", td->name);
        len_bytes = raw_len;
        len_bits = len_bytes * 8;

        p = REALLOC(st->buf, st->size + len_bytes + 1);
        if(!p) RETURN(RC_FAIL);
        st->buf = (uint8_t *)p;

        ret = per_get_many_bits(pd, &st->buf[st->size], 0, len_bits);
        if(ret < 0) RETURN(RC_WMORE);
        consumed_myself += len_bits;
        st->size += len_bytes;
    } while(repeat);
    st->buf[st->size] = 0; /* nul-terminate */

    RETURN(RC_OK);
}

asn_enc_rval_t
ANY_encode_uper(asn_TYPE_descriptor_t *td,
                const asn_per_constraints_t *constraints, void *sptr,
                asn_per_outp_t *po) {
    const ANY_t *st = (const ANY_t *)sptr;
    asn_enc_rval_t er = {0, 0, 0};
    const uint8_t *buf;
    size_t size;
    int ret;

    (void)constraints;

    if(!st || (!st->buf && st->size)) ASN__ENCODE_FAILED;

    buf = st->buf;
    size = st->size;
    while(size) {
        ssize_t may_save = uper_put_length(po, size);
        if(may_save < 0) ASN__ENCODE_FAILED;

        ret = per_put_many_bits(po, buf, may_save * 8);
        if(ret) ASN__ENCODE_FAILED;

        buf += may_save;
        size -= may_save;
        assert(!(may_save & 0x07) || !size);
    }

    ASN__ENCODED_OK(er);
}

#endif /* ASN_DISABLE_PER_SUPPORT */