+++ /dev/null
-/*
- * Copyright (c) 2017 Lev Walkin <vlm@lionet.info>. All rights reserved.
- * Redistribution and modifications are permitted subject to BSD license.
- */
-#include <asn_internal.h>
-#include <asn_codecs_prim.h>
-
-/*
- * The OER decoder of any type.
- */
-asn_dec_rval_t
-oer_decode(const asn_codec_ctx_t *opt_codec_ctx,
- const asn_TYPE_descriptor_t *type_descriptor, void **struct_ptr,
- const void *ptr, size_t size) {
- asn_codec_ctx_t s_codec_ctx;
-
- /*
- * Stack checker requires that the codec context
- * must be allocated on the stack.
- */
- if(opt_codec_ctx) {
- if(opt_codec_ctx->max_stack_size) {
- s_codec_ctx = *opt_codec_ctx;
- opt_codec_ctx = &s_codec_ctx;
- }
- } else {
- /* If context is not given, be security-conscious anyway */
- memset(&s_codec_ctx, 0, sizeof(s_codec_ctx));
- s_codec_ctx.max_stack_size = ASN__DEFAULT_STACK_MAX;
- opt_codec_ctx = &s_codec_ctx;
- }
-
- /*
- * Invoke type-specific decoder.
- */
- return type_descriptor->op->oer_decoder(opt_codec_ctx, type_descriptor, 0,
- struct_ptr, /* Pointer to the destination structure */
- ptr, size /* Buffer and its size */
- );
-}
-
-/*
- * Open Type is encoded as a length (#8.6) followed by that number of bytes.
- * Since we're just skipping, reading the length would be enough.
- */
-ssize_t
-oer_open_type_skip(const void *bufptr, size_t size) {
- size_t len = 0;
- return oer_fetch_length(bufptr, size, &len);
-}
-
-/*
- * Read the Open Type (X.696 (08/2015), #30).
- * RETURN VALUES:
- * 0: More data expected than bufptr contains.
- * -1: Fatal error deciphering length.
- * >0: Number of bytes used from bufptr.
- */
-ssize_t
-oer_open_type_get(const asn_codec_ctx_t *opt_codec_ctx,
- const struct asn_TYPE_descriptor_s *td,
- const asn_oer_constraints_t *constraints, void **struct_ptr,
- const void *bufptr, size_t size) {
- asn_dec_rval_t dr;
- size_t container_len = 0;
- ssize_t len_len;
- enum asn_struct_free_method dispose_method =
- (*struct_ptr) ? ASFM_FREE_UNDERLYING_AND_RESET : ASFM_FREE_EVERYTHING;
-
- /* Get the size of a length determinant */
- len_len = oer_fetch_length(bufptr, size, &container_len);
- if(len_len <= 0) {
- return len_len; /* Error or more data expected */
- }
-
- /*
- * len_len can't be bigger than size, but size without len_len
- * should be bigger or equal to container length
- */
- if(size - len_len < container_len) {
- /* More data is expected */
- return 0;
- }
-
- dr = td->op->oer_decoder(opt_codec_ctx, td, constraints, struct_ptr,
- (const uint8_t *)bufptr + len_len, container_len);
- if(dr.code == RC_OK) {
- return len_len + container_len;
- } else {
- /* Even if RC_WMORE, we can't get more data into a closed container. */
- td->op->free_struct(td, *struct_ptr, dispose_method);
- *struct_ptr = NULL;
- return -1;
- }
-}
-
-
-asn_dec_rval_t
-oer_decode_primitive(const asn_codec_ctx_t *opt_codec_ctx,
- const asn_TYPE_descriptor_t *td,
- const asn_oer_constraints_t *constraints, void **sptr,
- const void *ptr, size_t size) {
- ASN__PRIMITIVE_TYPE_t *st = (ASN__PRIMITIVE_TYPE_t *)*sptr;
- asn_dec_rval_t rval = {RC_OK, 0};
- size_t expected_length = 0;
- ssize_t len_len;
-
- (void)td;
- (void)opt_codec_ctx;
- (void)constraints;
-
- if(!st) {
- st = (ASN__PRIMITIVE_TYPE_t *)(*sptr = CALLOC(
- 1, sizeof(ASN__PRIMITIVE_TYPE_t)));
- if(!st) ASN__DECODE_FAILED;
- }
-
-
- /*
- * X.696 (08/2015) #27.2
- * Encode length determinant as _number of octets_, but only
- * if upper bound is not equal to lower bound.
- */
- len_len = oer_fetch_length(ptr, size, &expected_length);
- if(len_len > 0) {
- rval.consumed = len_len;
- ptr = (const char *)ptr + len_len;
- size -= len_len;
- } else if(len_len == 0) {
- ASN__DECODE_STARVED;
- } else if(len_len < 0) {
- ASN__DECODE_FAILED;
- }
-
- if(size < expected_length) {
- ASN__DECODE_STARVED;
- } else {
- uint8_t *buf = MALLOC(expected_length + 1);
- if(buf == NULL) {
- ASN__DECODE_FAILED;
- } else {
- memcpy(buf, ptr, expected_length);
- buf[expected_length] = '\0';
- }
- FREEMEM(st->buf);
- st->buf = buf;
- st->size = expected_length;
-
- rval.consumed += expected_length;
- return rval;
- }
-}