diff options
Diffstat (limited to 'src/per_decoder.c')
| -rw-r--r-- | src/per_decoder.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/per_decoder.c b/src/per_decoder.c index 16dee36..2b3d2e2 100644 --- a/src/per_decoder.c +++ b/src/per_decoder.c @@ -2,6 +2,40 @@ #include <asn_internal.h> #include <per_decoder.h> +/* + * Decode a "Production of a complete encoding", X.691#10.1. + * The complete encoding contains at least one byte, and is an integral + * multiple of 8 bytes. + */ +asn_dec_rval_t +uper_decode_complete(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td, void **sptr, const void *buffer, size_t size) { + asn_dec_rval_t rval; + + rval = uper_decode(opt_codec_ctx, td, sptr, buffer, size, 0, 0); + if(rval.consumed) { + /* + * We've always given 8-aligned data, + * so convert bits to integral bytes. + */ + rval.consumed += 7; + rval.consumed >>= 3; + } else if(rval.code == RC_OK) { + if(size) { + if(((uint8_t *)buffer)[0] == 0) { + rval.consumed = 1; /* 1 byte */ + } else { + ASN_DEBUG("Expecting single zeroed byte"); + rval.code = RC_FAIL; + } + } else { + /* Must contain at least 8 bits. */ + rval.code = RC_WMORE; + } + } + + return rval; +} + 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; @@ -30,6 +64,7 @@ uper_decode(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td, void **sp } /* Fill in the position indicator */ + memset(&pd, 0, sizeof(pd)); pd.buffer = (const uint8_t *)buffer; pd.nboff = skip_bits; pd.nbits = 8 * size - unused_bits; /* 8 is CHAR_BIT from <limits.h> */ @@ -46,6 +81,9 @@ uper_decode(asn_codec_ctx_t *opt_codec_ctx, asn_TYPE_descriptor_t *td, void **sp /* Return the number of consumed bits */ rval.consumed = ((pd.buffer - (const uint8_t *)buffer) << 3) + pd.nboff - skip_bits; + ASN_DEBUG("PER decoding consumed %d, counted %d", + rval.consumed, pd.moved); + assert(rval.consumed == pd.moved); } else { /* PER codec is not a restartable */ rval.consumed = 0; |