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