+static int
+OCTET_STRING_per_get_characters(asn_per_data_t *po, uint8_t *buf,
+ size_t units, unsigned int bpc, unsigned int unit_bits,
+ long lb, long ub, asn_per_constraints_t *pc) {
+ uint8_t *end = buf + units * bpc;
+
+ ASN_DEBUG("Expanding %d characters into (%ld..%ld):%d",
+ (int)units, lb, ub, unit_bits);
+
+ /* X.691: 27.5.4 */
+ if((unsigned long)ub <= ((unsigned long)2 << (unit_bits - 1))) {
+ /* Decode without translation */
+ lb = 0;
+ } else if(pc && pc->code2value) {
+ if(unit_bits > 16)
+ return 1; /* FATAL: can't have constrained
+ * UniversalString with more than
+ * 16 million code points */
+ for(; buf < end; buf += bpc) {
+ int value;
+ int code = per_get_few_bits(po, unit_bits);
+ if(code < 0) return -1; /* WMORE */
+ value = pc->code2value(code);
+ if(value < 0) {
+ ASN_DEBUG("Code %d (0x%02x) is"
+ " not in map (%ld..%ld)",
+ code, code, lb, ub);
+ return 1; /* FATAL */
+ }
+ switch(bpc) {
+ case 1: *buf = value; break;
+ case 2: buf[0] = value >> 8; buf[1] = value; break;
+ case 4: buf[0] = value >> 24; buf[1] = value >> 16;
+ buf[2] = value >> 8; buf[3] = value; break;
+ }
+ }
+ return 0;
+ }
+
+ /* Shortcut the no-op copying to the aligned structure */
+ if(lb == 0 && (unit_bits == 8 * bpc)) {
+ return per_get_many_bits(po, buf, 0, unit_bits * units);
+ }
+
+ for(; buf < end; buf += bpc) {
+ int code = per_get_few_bits(po, unit_bits);
+ int ch = code + lb;
+ if(code < 0) return -1; /* WMORE */
+ if(ch > ub) {
+ ASN_DEBUG("Code %d is out of range (%ld..%ld)",
+ ch, lb, ub);
+ return 1; /* FATAL */
+ }
+ switch(bpc) {
+ case 1: *buf = ch; break;
+ case 2: buf[0] = ch >> 8; buf[1] = ch; break;
+ case 4: buf[0] = ch >> 24; buf[1] = ch >> 16;
+ buf[2] = ch >> 8; buf[3] = ch; break;
+ }
+ }
+
+ return 0;
+}
+
+static int
+OCTET_STRING_per_put_characters(asn_per_outp_t *po, const uint8_t *buf,
+ size_t units, unsigned int bpc, unsigned int unit_bits,
+ long lb, long ub, asn_per_constraints_t *pc) {
+ const uint8_t *end = buf + units * bpc;
+
+ ASN_DEBUG("Squeezing %d characters into (%ld..%ld):%d (%d bpc)",
+ (int)units, lb, ub, unit_bits, bpc);
+
+ /* X.691: 27.5.4 */
+ if((unsigned long)ub <= ((unsigned long)2 << (unit_bits - 1))) {
+ /* Encode as is */
+ lb = 0;
+ } else if(pc && pc->value2code) {
+ for(; buf < end; buf += bpc) {
+ int code;
+ uint32_t value;
+ switch(bpc) {
+ case 1: value = *(const uint8_t *)buf; break;
+ case 2: value = (buf[0] << 8) | buf[1]; break;
+ case 4: value = (buf[0] << 24) | (buf[1] << 16)
+ | (buf[2] << 8) | buf[3]; break;
+ default: return -1;
+ }
+ code = pc->value2code(value);
+ if(code < 0) {
+ ASN_DEBUG("Character %d (0x%02x) is"
+ " not in map (%ld..%ld)",
+ *buf, *buf, lb, ub);
+ return -1;
+ }
+ if(per_put_few_bits(po, code, unit_bits))
+ return -1;
+ }
+ }
+
+ /* Shortcut the no-op copying to the aligned structure */
+ if(lb == 0 && (unit_bits == 8 * bpc)) {
+ return per_put_many_bits(po, buf, unit_bits * units);
+ }
+
+ for(ub -= lb; buf < end; buf += bpc) {
+ int ch;
+ uint32_t value;
+ switch(bpc) {
+ case 1: value = *(const uint8_t *)buf; break;
+ case 2: value = (buf[0] << 8) | buf[1]; break;
+ case 4: value = (buf[0] << 24) | (buf[1] << 16)
+ | (buf[2] << 8) | buf[3]; break;
+ default: return -1;
+ }
+ ch = value - lb;
+ if(ch < 0 || ch > ub) {
+ ASN_DEBUG("Character %d (0x%02x)"
+ " is out of range (%ld..%ld)",
+ *buf, *buf, lb, ub + lb);
+ return -1;
+ }
+ if(per_put_few_bits(po, ch, unit_bits))
+ return -1;
+ }
+
+ return 0;
+}
+
git.stg.codes / stg.git / blobdiff