/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include <tinycbor/cbor.h>
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#include <tinycbor/cbor_buf_writer.h>
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static inline int
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would_overflow(struct cbor_buf_writer *cb, size_t len)
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{
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ptrdiff_t remaining = (ptrdiff_t)cb->end;
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remaining -= (ptrdiff_t)cb->ptr;
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remaining -= (ptrdiff_t)len;
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return (remaining < 0);
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}
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int
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cbor_buf_writer(struct cbor_encoder_writer *arg, const char *data, int len)
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{
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struct cbor_buf_writer *cb = (struct cbor_buf_writer *) arg;
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if (would_overflow(cb, len)) {
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return CborErrorOutOfMemory;
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}
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memcpy(cb->ptr, data, len);
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cb->ptr += len;
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cb->enc.bytes_written += len;
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return CborNoError;
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}
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void
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cbor_buf_writer_init(struct cbor_buf_writer *cb, uint8_t *buffer, size_t size)
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{
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cb->ptr = buffer;
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cb->end = buffer + size;
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cb->enc.bytes_written = 0;
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cb->enc.write = cbor_buf_writer;
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}
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size_t
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cbor_buf_writer_buffer_size(struct cbor_buf_writer *cb, const uint8_t *buffer)
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{
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return (size_t)(cb->ptr - buffer);
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}
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