shared stuff split off to per_opentype.[ch]

1 files changed, 245 insertions, 0 deletions

diff --git a/skeletons/per_opentype.c b/skeletons/per_opentype.c
new file mode 100644
index 00000000..f2cac938
--- /dev/null
+++ b/skeletons/per_opentype.c
@@ -0,0 +1,245 @@
+/*
+ * 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 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);
+
+/*
+ * #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;
+	ssize_t size;
+
+	ASN_DEBUG("Encoding as open type %s", td->name);
+	size = uper_encode_to_new_buffer(td, constraints, sptr, &buf);
+	if(size <= 0) return -1;
+
+	ASN_DEBUG("Putting %s of length %d", td->name, size);
+	while(size) {
+		ssize_t maySave = uper_put_length(po, size);
+		if(maySave < 0) break;
+		if(per_put_many_bits(po, buf, maySave * 8)) break;
+		buf = (char *)buf + maySave;
+		size -= maySave;
+	}
+
+	if(size) {
+		FREEMEM(buf);
+		return -1;
+	}
+
+	return 0;
+}
+
+asn_dec_rval_t
+uper_open_type_get(asn_codec_ctx_t *opt_codec_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(opt_codec_ctx);
+
+	ASN_DEBUG("Getting open type off %d (%d+%d), %p", pd->moved, pd->nboff, pd->nbits, pd->buffer);
+	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 */
+
+	rv = td->uper_decoder(opt_codec_ctx, td, constraints, sptr, pd);
+
+	ASN_DEBUG("Open type %s consumed %d off of %d unclaimed=%d, repeat=%d",
+		td->name, pd->moved, arg.oldpd.moved,
+		arg.unclaimed, arg.repeat);
+
+	ASN_DEBUG("OT1 moved %d, estimated %d uncl=%d",
+		arg.oldpd.moved,
+		arg.oldpd.nboff + ((((int)arg.oldpd.buffer) & 0x7) << 3),
+		arg.unclaimed
+	);
+
+	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;
+			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");
+			_ASN_DECODE_STARVED;
+		case 0: break;
+		default:
+			ASN_DEBUG("Non-blank padding (%d bits 0x%02x)",
+				padding, pvalue);
+			_ASN_DECODE_FAILED;
+		}
+	}
+	if(pd->nbits != pd->nboff) {
+		ASN_DEBUG("Open type container overhead of %d bits!", pd->nbits - pd->nboff);
+		if(1) _ASN_DECODE_FAILED;
+		arg.unclaimed += pd->nbits - pd->nboff;
+	}
+
+	/* Adjust pd back so it points to original data */
+	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;
+
+	/* Skip data not consumed by the decoder */
+	if(arg.unclaimed) ASN_DEBUG("Getting unclaimed %d", arg.unclaimed);
+	while(arg.unclaimed) {
+		size_t toget = 24;
+		if(arg.unclaimed < toget)
+			toget = arg.unclaimed;
+		arg.unclaimed -= toget;
+		switch(per_get_few_bits(pd, toget)) {
+		case -1:
+			ASN_DEBUG("Claim of %d failed", toget);
+			_ASN_DECODE_STARVED;
+		case 0:
+			ASN_DEBUG("Got claim of %d", toget);
+			continue;
+		default:
+			/* Padding must be blank */
+			ASN_DEBUG("Non-blank unconsumed padding");
+			_ASN_DECODE_FAILED;
+		}
+	}
+
+	assert(pd->moved == pd->nboff + ((((int)pd->buffer) & 0x7) << 3));
+
+	if(arg.repeat) {
+		ASN_DEBUG("Not consumed the whole thing");
+		rv.code = RC_FAIL;
+		return rv;
+	}
+
+	return rv;
+}
+
+int
+uper_open_type_skip(asn_codec_ctx_t *opt_codec_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(opt_codec_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 *opt_codec_ctx, asn_TYPE_descriptor_t *td,
+	asn_per_constraints_t *constraints, void **sptr, asn_per_data_t *pd) {
+	asn_dec_rval_t rv;
+
+	(void)opt_codec_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 (%+db) [from %d (%d->%d)_%d] now [%d (%d->%d)_%d] uncl %d",
+		pd->buffer - oldpd->buffer,
+		oldpd->nbits - oldpd->nboff, oldpd->nboff, oldpd->nbits, oldpd->moved,
+		pd->nbits - pd->nboff, pd->nboff, pd->nbits, pd->moved, arg->unclaimed);
+
+	/* 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("Return from UNCLAIMED");
+		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;
+	} else {
+		pd->nbits = oldpd->nbits;
+		arg->unclaimed = next_chunk_bits - avail;
+		ASN_DEBUG("Parent has %d, require %d, will claim %d", avail, next_chunk_bits, arg->unclaimed);
+	}
+	pd->buffer = oldpd->buffer;
+	pd->nboff = oldpd->nboff;
+	return 0;
+}