| #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) { |
| asn_codec_ctx_t s_codec_ctx; |
| asn_per_data_t pd; |
| |
| /* |
| * 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 = 0; |
| pd.nbits = 8 * size; /* 8 is CHAR_BIT from <limits.h> */ |
| |
| /* |
| * Invoke type-specific decoder. |
| */ |
| if(!td->uper_decoder) |
| _ASN_DECODE_FAILED; /* PER is not compiled in */ |
| return td->uper_decoder(opt_codec_ctx, td, 0, sptr, &pd); |
| } |
| |