2007-06-27 04:09:37 +00:00
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/*
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* Copyright (c) 2007 Lev Walkin <vlm@lionet.info>. All rights reserved.
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* Redistribution and modifications are permitted subject to BSD license.
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*/
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#include <asn_internal.h>
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#include <per_support.h>
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#include <constr_TYPE.h>
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#include <per_opentype.h>
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typedef struct uper_ugot_key {
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asn_per_data_t oldpd; /* Old per data source */
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size_t unclaimed;
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size_t ot_moved; /* Number of bits moved by OT processing */
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int repeat;
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} uper_ugot_key;
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static int uper_ugot_refill(asn_per_data_t *pd);
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static asn_dec_rval_t uper_sot_suck(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd);
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/*
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* #10.1, #10.2
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*/
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int
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uper_open_type_put(asn_TYPE_descriptor_t *td, asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po) {
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void *buf;
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ssize_t size;
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ASN_DEBUG("Encoding as open type %s", td->name);
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size = uper_encode_to_new_buffer(td, constraints, sptr, &buf);
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if(size <= 0) return -1;
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ASN_DEBUG("Putting %s of length %d", td->name, size);
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while(size) {
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ssize_t maySave = uper_put_length(po, size);
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if(maySave < 0) break;
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if(per_put_many_bits(po, buf, maySave * 8)) break;
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buf = (char *)buf + maySave;
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size -= maySave;
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}
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if(size) {
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FREEMEM(buf);
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return -1;
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}
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return 0;
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}
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asn_dec_rval_t
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uper_open_type_get(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
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asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
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uper_ugot_key arg;
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asn_dec_rval_t rv;
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ssize_t padding;
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_ASN_STACK_OVERFLOW_CHECK(opt_codec_ctx);
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ASN_DEBUG("Getting open type off %d (%d+%d), %p", pd->moved, pd->nboff, pd->nbits, pd->buffer);
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arg.oldpd = *pd;
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arg.unclaimed = 0;
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arg.ot_moved = 0;
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arg.repeat = 1;
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pd->refill = uper_ugot_refill;
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pd->refill_key = &arg;
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pd->nbits = pd->nboff; /* 0 good bits at this point, will refill */
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pd->moved = 0; /* This now counts the open type size in bits */
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rv = td->uper_decoder(opt_codec_ctx, td, constraints, sptr, pd);
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ASN_DEBUG("Open type %s consumed %d off of %d unclaimed=%d, repeat=%d",
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td->name, pd->moved, arg.oldpd.moved,
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arg.unclaimed, arg.repeat);
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ASN_DEBUG("OT1 moved %d, estimated %d uncl=%d",
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arg.oldpd.moved,
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arg.oldpd.nboff + ((((int)arg.oldpd.buffer) & 0x7) << 3),
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arg.unclaimed
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);
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padding = pd->moved % 8;
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if(padding) {
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int32_t pvalue;
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if(padding > 7) {
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ASN_DEBUG("Too large padding %d in open type",
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padding);
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rv.code = RC_FAIL;
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return rv;
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}
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padding = 8 - padding;
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ASN_DEBUG("Getting padding of %d bits", padding);
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pvalue = per_get_few_bits(pd, padding);
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switch(pvalue) {
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case -1:
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ASN_DEBUG("Padding skip failed");
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_ASN_DECODE_STARVED;
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case 0: break;
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default:
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ASN_DEBUG("Non-blank padding (%d bits 0x%02x)",
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padding, pvalue);
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_ASN_DECODE_FAILED;
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}
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}
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if(pd->nbits != pd->nboff) {
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ASN_DEBUG("Open type container overhead of %d bits!", pd->nbits - pd->nboff);
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if(1) _ASN_DECODE_FAILED;
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arg.unclaimed += pd->nbits - pd->nboff;
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}
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/* Adjust pd back so it points to original data */
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pd->nbits = arg.oldpd.nbits - (pd->moved - arg.ot_moved);
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pd->moved = arg.oldpd.moved + (pd->moved - arg.ot_moved);
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pd->refill = arg.oldpd.refill;
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pd->refill_key = arg.oldpd.refill_key;
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/* Skip data not consumed by the decoder */
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if(arg.unclaimed) ASN_DEBUG("Getting unclaimed %d", arg.unclaimed);
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while(arg.unclaimed) {
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size_t toget = 24;
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if(arg.unclaimed < toget)
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toget = arg.unclaimed;
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arg.unclaimed -= toget;
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switch(per_get_few_bits(pd, toget)) {
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case -1:
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ASN_DEBUG("Claim of %d failed", toget);
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_ASN_DECODE_STARVED;
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case 0:
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ASN_DEBUG("Got claim of %d", toget);
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continue;
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default:
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/* Padding must be blank */
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ASN_DEBUG("Non-blank unconsumed padding");
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_ASN_DECODE_FAILED;
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}
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}
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2007-06-27 04:17:51 +00:00
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if(0) /* Special debugging assert */
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2007-06-27 04:09:37 +00:00
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assert(pd->moved == pd->nboff + ((((int)pd->buffer) & 0x7) << 3));
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if(arg.repeat) {
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ASN_DEBUG("Not consumed the whole thing");
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rv.code = RC_FAIL;
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return rv;
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}
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return rv;
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}
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int
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uper_open_type_skip(asn_codec_ctx_t *opt_codec_ctx, asn_per_data_t *pd) {
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asn_TYPE_descriptor_t s_td;
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asn_dec_rval_t rv;
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s_td.name = "<unknown extension>";
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s_td.uper_decoder = uper_sot_suck;
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rv = uper_open_type_get(opt_codec_ctx, &s_td, 0, 0, pd);
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if(rv.code != RC_OK)
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return -1;
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else
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return 0;
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}
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/*
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* Internal functions.
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*/
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static asn_dec_rval_t
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uper_sot_suck(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td,
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asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
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asn_dec_rval_t rv;
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(void)opt_codec_ctx;
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(void)td;
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(void)constraints;
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(void)sptr;
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while(per_get_few_bits(pd, 24) >= 0);
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rv.code = RC_OK;
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rv.consumed = pd->moved;
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return rv;
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}
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static int
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uper_ugot_refill(asn_per_data_t *pd) {
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uper_ugot_key *arg = pd->refill_key;
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ssize_t next_chunk_bytes, next_chunk_bits;
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ssize_t avail;
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asn_per_data_t *oldpd = &arg->oldpd;
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ASN_DEBUG("REFILLING (%+db) [from %d (%d->%d)_%d] now [%d (%d->%d)_%d] uncl %d",
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pd->buffer - oldpd->buffer,
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oldpd->nbits - oldpd->nboff, oldpd->nboff, oldpd->nbits, oldpd->moved,
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pd->nbits - pd->nboff, pd->nboff, pd->nbits, pd->moved, arg->unclaimed);
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/* Advance our position to where pd is */
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oldpd->buffer = pd->buffer;
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oldpd->nboff = pd->nboff;
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oldpd->nbits -= pd->moved - arg->ot_moved;
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oldpd->moved += pd->moved - arg->ot_moved;
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arg->ot_moved = pd->moved;
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if(arg->unclaimed) {
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/* Refill the container */
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if(per_get_few_bits(oldpd, 1))
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return -1;
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if(oldpd->nboff == 0) {
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assert(0);
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return -1;
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}
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pd->buffer = oldpd->buffer;
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pd->nboff = oldpd->nboff - 1;
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pd->nbits = oldpd->nbits;
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ASN_DEBUG("Return from UNCLAIMED");
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return 0;
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}
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if(!arg->repeat) {
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ASN_DEBUG("Want more but refill doesn't have it");
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return -1;
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}
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next_chunk_bytes = uper_get_length(oldpd, -1, &arg->repeat);
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ASN_DEBUG("Open type LENGTH %d bytes at off %d, repeat %d",
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next_chunk_bytes, oldpd->moved, arg->repeat);
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if(next_chunk_bytes < 0) return -1;
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if(next_chunk_bytes == 0) {
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pd->refill = 0; /* No more refills, naturally */
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assert(!arg->repeat); /* Implementation guarantee */
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}
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next_chunk_bits = next_chunk_bytes << 3;
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avail = oldpd->nbits - oldpd->nboff;
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if(avail >= next_chunk_bits) {
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pd->nbits = oldpd->nboff + next_chunk_bits;
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arg->unclaimed = 0;
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} else {
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pd->nbits = oldpd->nbits;
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arg->unclaimed = next_chunk_bits - avail;
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ASN_DEBUG("Parent has %d, require %d, will claim %d", avail, next_chunk_bits, arg->unclaimed);
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}
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pd->buffer = oldpd->buffer;
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pd->nboff = oldpd->nboff;
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return 0;
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}
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