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130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
#include <asn_application.h>
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#include <asn_internal.h>
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#include <aper_encoder.h>
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/*
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* Argument type and callback necessary for aper_encode_to_buffer().
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*/
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typedef struct enc_to_buf_arg {
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void *buffer;
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size_t left;
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} enc_to_buf_arg;
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static int encode_to_buffer_cb(const void *buffer, size_t size, void *key) {
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enc_to_buf_arg *arg = (enc_to_buf_arg *)key;
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if(arg->left < size)
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return -1; /* Data exceeds the available buffer size */
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memcpy(arg->buffer, buffer, size);
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arg->buffer = ((char *)arg->buffer) + size;
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arg->left -= size;
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return 0;
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}
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asn_enc_rval_t
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aper_encode_to_buffer(const asn_TYPE_descriptor_t *td,
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const asn_per_constraints_t *constraints,
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const void *sptr, void *buffer, size_t buffer_size) {
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enc_to_buf_arg key;
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key.buffer = buffer;
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key.left = buffer_size;
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if(td) ASN_DEBUG("Encoding \"%s\" using ALIGNED PER", td->name);
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return aper_encode(td, constraints, sptr, encode_to_buffer_cb, &key);
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}
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ssize_t
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aper_encode_to_new_buffer(const asn_TYPE_descriptor_t *td,
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const asn_per_constraints_t *constraints,
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const void *sptr, void **buffer_r) {
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asn_enc_rval_t er = {0,0,0};
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enc_dyn_arg key;
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memset(&key, 0, sizeof(key));
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er = aper_encode(td, constraints, sptr, encode_dyn_cb, &key);
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switch(er.encoded) {
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case -1:
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FREEMEM(key.buffer);
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return -1;
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case 0:
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FREEMEM(key.buffer);
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key.buffer = MALLOC(1);
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if(key.buffer) {
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*(char *)key.buffer = '\0';
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*buffer_r = key.buffer;
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return 1;
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} else {
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return -1;
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}
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default:
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*buffer_r = key.buffer;
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ASN_DEBUG("Complete encoded in %ld bits", (long)er.encoded);
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return ((er.encoded + 7) >> 3);
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}
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}
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/*
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* Internally useful functions.
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*/
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/* Flush partially filled buffer */
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static int
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_aper_encode_flush_outp(asn_per_outp_t *po) {
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uint8_t *buf;
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if(po->nboff == 0 && po->buffer == po->tmpspace)
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return 0;
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buf = po->buffer + (po->nboff >> 3);
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/* Make sure we account for the last, partially filled */
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if(po->nboff & 0x07) {
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buf[0] &= 0xff << (8 - (po->nboff & 0x07));
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buf++;
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}
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if (po->output) {
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return po->output(po->tmpspace, buf - po->tmpspace, po->op_key);
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}
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return 0;
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}
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asn_enc_rval_t
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aper_encode(const asn_TYPE_descriptor_t *td,
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const asn_per_constraints_t *constraints,
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const void *sptr, asn_app_consume_bytes_f *cb, void *app_key) {
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asn_per_outp_t po;
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asn_enc_rval_t er = {0,0,0};
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/*
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* Invoke type-specific encoder.
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*/
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if(!td || !td->op->aper_encoder)
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ASN__ENCODE_FAILED; /* PER is not compiled in */
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po.buffer = po.tmpspace;
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po.nboff = 0;
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po.nbits = 8 * sizeof(po.tmpspace);
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po.output = cb ? cb : ignore_output;
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po.op_key = app_key;
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po.flushed_bytes = 0;
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er = td->op->aper_encoder(td, constraints, sptr, &po);
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if(er.encoded != -1) {
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size_t bits_to_flush;
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bits_to_flush = ((po.buffer - po.tmpspace) << 3) + po.nboff;
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/* Set number of bits encoded to a firm value */
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er.encoded = (po.flushed_bytes << 3) + bits_to_flush;
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if(_aper_encode_flush_outp(&po))
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ASN__ENCODE_FAILED;
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}
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return er;
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}
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