libcoap 4.3.2rc2

Functions
Encode / Decode API
Application API

API for endoding/decoding CoAP options. More...

## Functions
unsigned int | coap_decode_var_bytes (const uint8_t *buf, size_t length)
| Decodes multiple-length byte sequences. More...
uint64_t | coap_decode_var_bytes8 (const uint8_t *buf, size_t length)
| Decodes multiple-length byte sequences. More...
unsigned int | coap_encode_var_safe (uint8_t *buf, size_t length, unsigned int value)
| Encodes multiple-length byte sequences. More...
unsigned int | coap_encode_var_safe8 (uint8_t *buf, size_t length, uint64_t value)
| Encodes multiple-length byte sequences. More...

## Detailed Description

API for endoding/decoding CoAP options.

## Function Documentation

## ◆ coap_decode_var_bytes()

unsigned int coap_decode_var_bytes | ( | const uint8_t * | buf,
|  | size_t | length
| ) |  |

Decodes multiple-length byte sequences.

`buf` points to an input byte sequence of length `length`. Returns the up to 4 byte decoded value.

Parameters

  buf | The input byte sequence to decode from
  length | The length of the input byte sequence

Returns
  The decoded value

Definition at line 38 of file coap_encode.c.

## ◆ coap_decode_var_bytes8()

uint64_t coap_decode_var_bytes8 | ( | const uint8_t * | buf,
|  | size_t | length
| ) |  |

Decodes multiple-length byte sequences.

`buf` points to an input byte sequence of length `length`. Returns the up to 8 byte decoded value.

Parameters

  buf | The input byte sequence to decode from
  length | The length of the input byte sequence

Returns
  The decoded value

Definition at line 67 of file coap_encode.c.

## ◆ coap_encode_var_safe()

unsigned int coap_encode_var_safe | ( | uint8_t * | buf,
|  | size_t | length,
|  | unsigned int | value
| ) |  |

Encodes multiple-length byte sequences.

`buf` points to an output buffer of sufficient length to store the encoded bytes. `value` is the 4 byte value to encode. Returns the number of bytes used to encode `value` or 0 on error.

Parameters

  buf | The output buffer to encode into
  length | The output buffer size to encode into (must be sufficient)
  value | The value to encode into the buffer

Returns
  The number of bytes used to encode `value` (which can be 0 when encoding value of 0) or `0` on error.

Definition at line 47 of file coap_encode.c.

## ◆ coap_encode_var_safe8()

unsigned int coap_encode_var_safe8 | ( | uint8_t * | buf,
|  | size_t | length,
|  | uint64_t | value
| ) |  |

Encodes multiple-length byte sequences.

`buf` points to an output buffer of sufficient length to store the encoded bytes. `value` is the 8 byte value to encode. Returns the number of bytes used to encode `value` or 0 on error.

Parameters

  buf | The output buffer to encode into
  length | The output buffer size to encode into (must be sufficient)
  value | The value to encode into the buffer

Returns
  The number of bytes used to encode `value` (which can be 0 when encoding value of 0) or `0` on error.

Definition at line 77 of file coap_encode.c.