1 #include <asn_application.h>
2 #include <asn_internal.h>
3 #include <per_decoder.h>
6 * Decode a "Production of a complete encoding", X.691#10.1.
7 * The complete encoding contains at least one byte, and is an integral
11 uper_decode_complete(const asn_codec_ctx_t *opt_codec_ctx,
12 const asn_TYPE_descriptor_t *td, void **sptr,
13 const void *buffer, size_t size) {
16 rval = uper_decode(opt_codec_ctx, td, sptr, buffer, size, 0, 0);
19 * We've always given 8-aligned data,
20 * so convert bits to integral bytes.
24 } else if(rval.code == RC_OK) {
26 if(((const uint8_t *)buffer)[0] == 0) {
27 rval.consumed = 1; /* 1 byte */
29 ASN_DEBUG("Expecting single zeroed byte");
33 /* Must contain at least 8 bits. */
42 uper_decode(const asn_codec_ctx_t *opt_codec_ctx,
43 const asn_TYPE_descriptor_t *td, void **sptr, const void *buffer,
44 size_t size, int skip_bits, int unused_bits) {
45 asn_codec_ctx_t s_codec_ctx;
49 if(skip_bits < 0 || skip_bits > 7
50 || unused_bits < 0 || unused_bits > 7
51 || (unused_bits > 0 && !size))
55 * Stack checker requires that the codec context
56 * must be allocated on the stack.
59 if(opt_codec_ctx->max_stack_size) {
60 s_codec_ctx = *opt_codec_ctx;
61 opt_codec_ctx = &s_codec_ctx;
64 /* If context is not given, be security-conscious anyway */
65 memset(&s_codec_ctx, 0, sizeof(s_codec_ctx));
66 s_codec_ctx.max_stack_size = ASN__DEFAULT_STACK_MAX;
67 opt_codec_ctx = &s_codec_ctx;
70 /* Fill in the position indicator */
71 memset(&pd, 0, sizeof(pd));
72 pd.buffer = (const uint8_t *)buffer;
74 pd.nbits = 8 * size - unused_bits; /* 8 is CHAR_BIT from <limits.h> */
75 if(pd.nboff > pd.nbits)
79 * Invoke type-specific decoder.
81 if(!td->op->uper_decoder)
82 ASN__DECODE_FAILED; /* PER is not compiled in */
83 rval = td->op->uper_decoder(opt_codec_ctx, td, 0, sptr, &pd);
84 if(rval.code == RC_OK) {
85 /* Return the number of consumed bits */
86 rval.consumed = ((pd.buffer - (const uint8_t *)buffer) << 3)
87 + pd.nboff - skip_bits;
88 ASN_DEBUG("PER decoding consumed %ld, counted %ld",
89 (long)rval.consumed, (long)pd.moved);
90 assert(rval.consumed == pd.moved);
92 /* PER codec is not a restartable */
99 aper_decode_complete(const asn_codec_ctx_t *opt_codec_ctx,
100 const asn_TYPE_descriptor_t *td, void **sptr,
101 const void *buffer, size_t size) {
104 rval = aper_decode(opt_codec_ctx, td, sptr, buffer, size, 0, 0);
107 * We've always given 8-aligned data,
108 * so convert bits to integral bytes.
112 } else if(rval.code == RC_OK) {
114 if(((const uint8_t *)buffer)[0] == 0) {
115 rval.consumed = 1; /* 1 byte */
117 ASN_DEBUG("Expecting single zeroed byte");
121 /* Must contain at least 8 bits. */
122 rval.code = RC_WMORE;
130 aper_decode(const asn_codec_ctx_t *opt_codec_ctx,
131 const asn_TYPE_descriptor_t *td, void **sptr, const void *buffer,
132 size_t size, int skip_bits, int unused_bits) {
133 asn_codec_ctx_t s_codec_ctx;
137 if(skip_bits < 0 || skip_bits > 7
138 || unused_bits < 0 || unused_bits > 7
139 || (unused_bits > 0 && !size))
143 * Stack checker requires that the codec context
144 * must be allocated on the stack.
147 if(opt_codec_ctx->max_stack_size) {
148 s_codec_ctx = *opt_codec_ctx;
149 opt_codec_ctx = &s_codec_ctx;
152 /* If context is not given, be security-conscious anyway */
153 memset(&s_codec_ctx, 0, sizeof(s_codec_ctx));
154 s_codec_ctx.max_stack_size = ASN__DEFAULT_STACK_MAX;
155 opt_codec_ctx = &s_codec_ctx;
158 /* Fill in the position indicator */
159 memset(&pd, 0, sizeof(pd));
160 pd.buffer = (const uint8_t *)buffer;
161 pd.nboff = skip_bits;
162 pd.nbits = 8 * size - unused_bits; /* 8 is CHAR_BIT from <limits.h> */
163 if(pd.nboff > pd.nbits)
167 * Invoke type-specific decoder.
169 if(!td->op->aper_decoder)
170 ASN__DECODE_FAILED; /* PER is not compiled in */
171 rval = td->op->aper_decoder(opt_codec_ctx, td, 0, sptr, &pd);
172 if(rval.code == RC_OK) {
173 /* Return the number of consumed bits */
174 rval.consumed = ((pd.buffer - (const uint8_t *)buffer) << 3)
175 + pd.nboff - skip_bits;
176 ASN_DEBUG("PER decoding consumed %zu, counted %zu",
177 rval.consumed, pd.moved);
178 assert(rval.consumed == pd.moved);
180 /* PER codec is not a restartable */