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/* Copyright (C) 2023 Aryadev Chavali
* You may distribute and modify this code under the terms of the
* GPLv2 license. You should have received a copy of the GPLv2
* license with this file. If not, please write to:
* aryadev@aryadevchavali.com.
* Created: 2023-10-26
* Author: Aryadev Chavali
* Description: Implementation of basic library functions
*/
#include "./base.h"
#include <string.h>
union hword_pun
{
hword h;
byte bytes[HWORD_SIZE];
};
union word_pun
{
word h;
byte bytes[WORD_SIZE];
};
hword hword_htobc(hword w)
{
#if __LITTLE_ENDIAN__
return w;
#else
union hword_pun x = {w};
union hword_pun y = {0};
for (size_t i = 0, j = HWORD_SIZE; i < HWORD_SIZE; ++i, --j)
y.bytes[j - 1] = x.bytes[i];
return y.h;
#endif
}
hword hword_bctoh(hword w)
{
#if __LITTLE_ENDIAN__
return w;
#else
union hword_pun x = {w};
union hword_pun y = {0};
for (size_t i = 0, j = HWORD_SIZE; i < HWORD_SIZE; ++i, --j)
y.bytes[j - 1] = x.bytes[i];
return y.h;
#endif
}
word word_htobc(word w)
{
#if __LITTLE_ENDIAN__
return w;
#else
union word_pun x = {w};
union word_pun y = {0};
for (size_t i = 0, j = WORD_SIZE; i < WORD_SIZE; ++i, --j)
y.bytes[j - 1] = x.bytes[i];
return y.h;
#endif
}
word word_bctoh(word w)
{
#if __LITTLE_ENDIAN__
return w;
#else
union word_pun x = {w};
union word_pun y = {0};
for (size_t i = 0, j = WORD_SIZE; i < WORD_SIZE; ++i, --j)
y.bytes[j - 1] = x.bytes[i];
return y.h;
#endif
}
hword convert_bytes_to_hword(byte *bytes)
{
hword be_h = 0;
memcpy(&be_h, bytes, HWORD_SIZE);
hword h = hword_bctoh(be_h);
return h;
}
void convert_hword_to_bytes(hword w, byte *bytes)
{
hword be_h = hword_htobc(w);
memcpy(bytes, &be_h, HWORD_SIZE);
}
void convert_word_to_bytes(word w, byte *bytes)
{
word be_w = word_htobc(w);
memcpy(bytes, &be_w, WORD_SIZE);
}
word convert_bytes_to_word(byte *bytes)
{
word be_w = 0;
memcpy(&be_w, bytes, WORD_SIZE);
word w = word_bctoh(be_w);
return w;
}
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