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/*
* Copyright (c) 2007 Lev Walkin <vlm@lionet.info>. All rights reserved.
* Redistribution and modifications are permitted subject to BSD license.
*/
#include <asn_internal.h>
#include <per_support.h>
#include <constr_TYPE.h>
#include <per_opentype.h>

typedef struct uper_ugot_key {
asn_per_data_t oldpd; /* Old per data source */
size_t unclaimed;
size_t ot_moved; /* Number of bits moved by OT processing */
int repeat;
} uper_ugot_key;

static int uper_ugot_refill(asn_per_data_t *pd);
static int per_skip_bits(asn_per_data_t *pd, int skip_nbits);
static asn_dec_rval_t uper_sot_suck(asn_codec_ctx_t *, asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd);

int asn_debug_indent;

/*
* Encode an "open type field".
* #10.1, #10.2
*/
int
uper_open_type_put(asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po) {
void *buf;
void *bptr;
ssize_t size;
size_t toGo;

ASN_DEBUG("Open type put %s ...", td->name);

size = uper_encode_to_new_buffer(td, constraints, sptr, &buf);
if(size <= 0) return -1;

for(bptr = buf, toGo = size; toGo;) {
ssize_t maySave = uper_put_length(po, toGo);
if(maySave < 0) break;
if(per_put_many_bits(po, bptr, maySave * 8)) break;
bptr = (char *)bptr + maySave;
toGo -= maySave;
}

FREEMEM(buf);
if(toGo) return -1;

ASN_DEBUG("Open type put %s of length %d + overhead (1byte?)",
td->name, size);

return 0;
}

static asn_dec_rval_t
uper_open_type_get_simple(asn_codec_ctx_t *ctx, asn_TYPE_descriptor_t *td,
asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
asn_dec_rval_t rv;
ssize_t chunk_bytes;
int repeat;
uint8_t *buf = 0;
size_t bufLen = 0;
size_t bufSize = 0;
asn_per_data_t spd;
size_t padding;

_ASN_STACK_OVERFLOW_CHECK(ctx);

ASN_DEBUG("Getting open type %s...", td->name);

do {
chunk_bytes = uper_get_length(pd, -1, &repeat);
if(chunk_bytes < 0) {
FREEMEM(buf);
_ASN_DECODE_STARVED;
}
if(bufLen + chunk_bytes > bufSize) {
void *ptr;
bufSize = chunk_bytes + (bufSize << 2);
ptr = REALLOC(buf, bufSize);
if(!ptr) {
FREEMEM(buf);
_ASN_DECODE_FAILED;
}
buf = ptr;
}
if(per_get_many_bits(pd, buf + bufLen, 0, chunk_bytes << 3)) {
FREEMEM(buf);
_ASN_DECODE_STARVED;
}
bufLen += chunk_bytes;
} while(repeat);

ASN_DEBUG("Getting open type %s encoded in %d bytes", td->name,
bufLen);

memset(&spd, 0, sizeof(spd));
spd.buffer = buf;
spd.nbits = bufLen << 3;

asn_debug_indent += 4;
rv = td->uper_decoder(ctx, td, constraints, sptr, &spd);
asn_debug_indent -= 4;

if(rv.code == RC_OK) {
/* Check padding validity */
padding = spd.nbits - spd.nboff;
if(padding < 8 && per_get_few_bits(&spd, padding) == 0) {
/* Everything is cool */
FREEMEM(buf);
return rv;
}
FREEMEM(buf);
if(padding >= 8) {
ASN_DEBUG("Too large padding %d in open type", padding);
_ASN_DECODE_FAILED;
} else {
ASN_DEBUG("Non-zero padding");
_ASN_DECODE_FAILED;
}
} else {
FREEMEM(buf);
/* rv.code could be RC_WMORE, nonsense in this context */
rv.code = RC_FAIL; /* Noone would give us more */
}

return rv;
}

static asn_dec_rval_t GCC_NOTUSED
uper_open_type_get_complex(asn_codec_ctx_t *ctx, asn_TYPE_descriptor_t *td,
asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
uper_ugot_key arg;
asn_dec_rval_t rv;
ssize_t padding;

_ASN_STACK_OVERFLOW_CHECK(ctx);

ASN_DEBUG("Getting open type %s from %s", td->name,
per_data_string(pd));
arg.oldpd = *pd;
arg.unclaimed = 0;
arg.ot_moved = 0;
arg.repeat = 1;
pd->refill = uper_ugot_refill;
pd->refill_key = &arg;
pd->nbits = pd->nboff; /* 0 good bits at this point, will refill */
pd->moved = 0; /* This now counts the open type size in bits */

asn_debug_indent += 4;
rv = td->uper_decoder(ctx, td, constraints, sptr, pd);
asn_debug_indent -= 4;

#define UPDRESTOREPD do { \
/* buffer and nboff are valid, preserve them. */ \
pd->nbits = arg.oldpd.nbits - (pd->moved - arg.ot_moved); \
pd->moved = arg.oldpd.moved + (pd->moved - arg.ot_moved); \
pd->refill = arg.oldpd.refill; \
pd->refill_key = arg.oldpd.refill_key; \
} while(0)

if(rv.code != RC_OK) {
UPDRESTOREPD;
return rv;
}

ASN_DEBUG("OpenType %s pd%s old%s unclaimed=%d, repeat=%d"
, td->name,
per_data_string(pd),
per_data_string(&arg.oldpd),
arg.unclaimed, arg.repeat);

padding = pd->moved % 8;
if(padding) {
int32_t pvalue;
if(padding > 7) {
ASN_DEBUG("Too large padding %d in open type",
padding);
rv.code = RC_FAIL;
UPDRESTOREPD;
return rv;
}
padding = 8 - padding;
ASN_DEBUG("Getting padding of %d bits", padding);
pvalue = per_get_few_bits(pd, padding);
switch(pvalue) {
case -1:
ASN_DEBUG("Padding skip failed");
UPDRESTOREPD;
_ASN_DECODE_STARVED;
case 0: break;
default:
ASN_DEBUG("Non-blank padding (%d bits 0x%02x)",
padding, (int)pvalue);
UPDRESTOREPD;
_ASN_DECODE_FAILED;
}
}
if(pd->nboff != pd->nbits) {
ASN_DEBUG("Open type %s overhead pd%s old%s", td->name,
per_data_string(pd), per_data_string(&arg.oldpd));
if(1) {
UPDRESTOREPD;
_ASN_DECODE_FAILED;
} else {
arg.unclaimed += pd->nbits - pd->nboff;
}
}

/* Adjust pd back so it points to original data */
UPDRESTOREPD;

/* Skip data not consumed by the decoder */
if(arg.unclaimed) ASN_DEBUG("Getting unclaimed %d", arg.unclaimed);
if(arg.unclaimed) {
switch(per_skip_bits(pd, arg.unclaimed)) {
case -1:
ASN_DEBUG("Claim of %d failed", arg.unclaimed);
_ASN_DECODE_STARVED;
case 0:
ASN_DEBUG("Got claim of %d", arg.unclaimed);
break;
default:
/* Padding must be blank */
ASN_DEBUG("Non-blank unconsumed padding");
_ASN_DECODE_FAILED;
}
arg.unclaimed = 0;
}

if(arg.repeat) {
ASN_DEBUG("Not consumed the whole thing");
rv.code = RC_FAIL;
return rv;
}

return rv;
}


asn_dec_rval_t
uper_open_type_get(asn_codec_ctx_t *ctx, asn_TYPE_descriptor_t *td,
asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {

return uper_open_type_get_simple(ctx, td, constraints,
sptr, pd);

}

int
uper_open_type_skip(asn_codec_ctx_t *ctx, asn_per_data_t *pd) {
asn_TYPE_descriptor_t s_td;
asn_dec_rval_t rv;

s_td.name = "<unknown extension>";
s_td.uper_decoder = uper_sot_suck;

rv = uper_open_type_get(ctx, &s_td, 0, 0, pd);
if(rv.code != RC_OK)
return -1;
else
return 0;
}

/*
* Internal functions.
*/

static asn_dec_rval_t
uper_sot_suck(asn_codec_ctx_t *ctx, asn_TYPE_descriptor_t *td,
asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
asn_dec_rval_t rv;

(void)ctx;
(void)td;
(void)constraints;
(void)sptr;

while(per_get_few_bits(pd, 24) >= 0);

rv.code = RC_OK;
rv.consumed = pd->moved;

return rv;
}

static int
uper_ugot_refill(asn_per_data_t *pd) {
uper_ugot_key *arg = pd->refill_key;
ssize_t next_chunk_bytes, next_chunk_bits;
ssize_t avail;

asn_per_data_t *oldpd = &arg->oldpd;

ASN_DEBUG("REFILLING pd->moved=%d, oldpd->moved=%d",
pd->moved, oldpd->moved);

/* Advance our position to where pd is */
oldpd->buffer = pd->buffer;
oldpd->nboff = pd->nboff;
oldpd->nbits -= pd->moved - arg->ot_moved;
oldpd->moved += pd->moved - arg->ot_moved;
arg->ot_moved = pd->moved;

if(arg->unclaimed) {
/* Refill the container */
if(per_get_few_bits(oldpd, 1))
return -1;
if(oldpd->nboff == 0) {
assert(0);
return -1;
}
pd->buffer = oldpd->buffer;
pd->nboff = oldpd->nboff - 1;
pd->nbits = oldpd->nbits;
ASN_DEBUG("UNCLAIMED <- return from (pd->moved=%d)", pd->moved);
return 0;
}

if(!arg->repeat) {
ASN_DEBUG("Want more but refill doesn't have it");
return -1;
}

next_chunk_bytes = uper_get_length(oldpd, -1, &arg->repeat);
ASN_DEBUG("Open type LENGTH %d bytes at off %d, repeat %d",
next_chunk_bytes, oldpd->moved, arg->repeat);
if(next_chunk_bytes < 0) return -1;
if(next_chunk_bytes == 0) {
pd->refill = 0; /* No more refills, naturally */
assert(!arg->repeat); /* Implementation guarantee */
}
next_chunk_bits = next_chunk_bytes << 3;
avail = oldpd->nbits - oldpd->nboff;
if(avail >= next_chunk_bits) {
pd->nbits = oldpd->nboff + next_chunk_bits;
arg->unclaimed = 0;
ASN_DEBUG("!+Parent frame %d bits, alloting %d [%d..%d] (%d)",
next_chunk_bits, oldpd->moved,
oldpd->nboff, oldpd->nbits,
oldpd->nbits - oldpd->nboff);
} else {
pd->nbits = oldpd->nbits;
arg->unclaimed = next_chunk_bits - avail;
ASN_DEBUG("!-Parent frame %d, require %d, will claim %d", avail, next_chunk_bits, arg->unclaimed);
}
pd->buffer = oldpd->buffer;
pd->nboff = oldpd->nboff;
ASN_DEBUG("Refilled pd%s old%s",
per_data_string(pd), per_data_string(oldpd));
return 0;
}

static int
per_skip_bits(asn_per_data_t *pd, int skip_nbits) {
int hasNonZeroBits = 0;
while(skip_nbits > 0) {
int skip;
if(skip_nbits < skip)
skip = skip_nbits;
else
skip = 24;
skip_nbits -= skip;

switch(per_get_few_bits(pd, skip)) {
case -1: return -1; /* Starving */
case 0: continue; /* Skipped empty space */
default: hasNonZeroBits = 1; continue;
}
}
return hasNonZeroBits;
}
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