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/*
* Copyright (c) 2014-2020 Pavel Kalvoda <[email protected]>
*
* libcbor is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#include "encoders.h"
#include <string.h>
size_t _cbor_encode_uint8(uint8_t value, unsigned char* buffer,
size_t buffer_size, uint8_t offset) {
if (value <= 23) {
if (buffer_size >= 1) {
buffer[0] = value + offset;
return 1;
}
} else {
if (buffer_size >= 2) {
buffer[0] = 0x18 + offset;
buffer[1] = value;
return 2;
}
}
return 0;
}
size_t _cbor_encode_uint16(uint16_t value, unsigned char* buffer,
size_t buffer_size, uint8_t offset) {
if (buffer_size < 3) {
return 0;
}
buffer[0] = 0x19 + offset;
#ifdef IS_BIG_ENDIAN
memcpy(buffer + 1, &value, 2);
#else
buffer[1] = (unsigned char)(value >> 8);
buffer[2] = (unsigned char)value;
#endif
return 3;
}
size_t _cbor_encode_uint32(uint32_t value, unsigned char* buffer,
size_t buffer_size, uint8_t offset) {
if (buffer_size < 5) {
return 0;
}
buffer[0] = 0x1A + offset;
#ifdef IS_BIG_ENDIAN
memcpy(buffer + 1, &value, 4);
#else
buffer[1] = (unsigned char)(value >> 24);
buffer[2] = (unsigned char)(value >> 16);
buffer[3] = (unsigned char)(value >> 8);
buffer[4] = (unsigned char)value;
#endif
return 5;
}
size_t _cbor_encode_uint64(uint64_t value, unsigned char* buffer,
size_t buffer_size, uint8_t offset) {
if (buffer_size >= 9) {
buffer[0] = 0x1B + offset;
#ifdef IS_BIG_ENDIAN
memcpy(buffer + 1, &value, 8);
#else
buffer[1] = (unsigned char)(value >> 56);
buffer[2] = (unsigned char)(value >> 48);
buffer[3] = (unsigned char)(value >> 40);
buffer[4] = (unsigned char)(value >> 32);
buffer[5] = (unsigned char)(value >> 24);
buffer[6] = (unsigned char)(value >> 16);
buffer[7] = (unsigned char)(value >> 8);
buffer[8] = (unsigned char)value;
#endif
return 9;
} else
return 0;
}
size_t _cbor_encode_uint(uint64_t value, unsigned char* buffer,
size_t buffer_size, uint8_t offset) {
if (value <= UINT16_MAX)
if (value <= UINT8_MAX)
return _cbor_encode_uint8((uint8_t)value, buffer, buffer_size, offset);
else
return _cbor_encode_uint16((uint16_t)value, buffer, buffer_size, offset);
else if (value <= UINT32_MAX)
return _cbor_encode_uint32((uint32_t)value, buffer, buffer_size, offset);
else
return _cbor_encode_uint64((uint64_t)value, buffer, buffer_size, offset);
}
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