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#include <asn_application.h>
#include <asn_internal.h>
#include <per_decoder.h>
asn_dec_rval_t uper_decode(asn_codec_ctx_t * opt_codec_ctx,
asn_TYPE_descriptor_t * td, void **sptr,
const void *buffer, size_t size, int skip_bits,
int unused_bits)
{
asn_codec_ctx_t s_codec_ctx;
asn_dec_rval_t rval;
asn_per_data_t pd;
if (skip_bits < 0 || skip_bits > 7 || unused_bits < 0 || unused_bits > 7 ||
(unused_bits > 0 && !size))
_ASN_DECODE_FAILED;
/*
* 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;
}
/* Fill in the position indicator */
pd.buffer = (const uint8_t *)buffer;
pd.nboff = skip_bits;
pd.nbits = 8 * size - unused_bits; /* 8 is CHAR_BIT from <limits.h> */
if (pd.nboff > pd.nbits)
_ASN_DECODE_FAILED;
/*
* Invoke type-specific decoder.
*/
if (!td->uper_decoder)
_ASN_DECODE_FAILED; /* PER is not compiled in */
rval = td->uper_decoder(opt_codec_ctx, td, 0, sptr, &pd);
if (rval.code == RC_OK) {
/* Return the number of consumed bits */
rval.consumed = ((pd.buffer - (const uint8_t *)buffer) << 3)
+ pd.nboff - skip_bits;
} else {
/* PER codec is not a restartable */
rval.consumed = 0;
}
return rval;
}
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