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