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Issue-24 Fixes big-endian conversion check and CRAN warning. #25

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Issue-24 Fixes big-endian conversion check and CRAN warning. #25

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32 changes: 24 additions & 8 deletions src/to_bigend.c
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Original file line number Diff line number Diff line change
Expand Up @@ -38,20 +38,36 @@ void to_bigend( unsigned char *intp, size_t size)
}

/* test code */
long init_value(size_t value_sz, unsigned char *num_pattern)
{
long value = 0;
for (size_t x = 0, ls = 0; x < value_sz; x++, ls += 8)
{
value += (long)num_pattern[value_sz - 1 - x] << ls;
}
return value;
}

void test_to_bigend()
{
unsigned char byte_pattern[1] = { 0x00 };
unsigned char byte_value = 0x00;

unsigned char num_pattern[sizeof(long)];
for (size_t x = 0; x < sizeof(long); x++)
{
num_pattern[x] = sizeof(long) - 1 - x;
}

unsigned char short_pattern[2] = { 0x01, 0x00 }; /* NB: big endian byte pattern */
short short_value = 0x0100; /* NB: hex is also written big endian */
unsigned char *byte_pattern = num_pattern + sizeof(long) - sizeof(unsigned char);
unsigned char byte_value = init_value(sizeof byte_value, byte_pattern);

unsigned char int_pattern[4] = { 0x03, 0x02, 0x01, 0x00 };
int int_value = 0x03020100;
unsigned char *short_pattern = num_pattern + sizeof(long) - sizeof(short);
short short_value = init_value(sizeof short_value, short_pattern);

unsigned char long_pattern[4] = { 0x03, 0x02, 0x01, 0x00 };
long long_value = 0x03020100;
unsigned char *int_pattern = num_pattern + sizeof(long) - sizeof(int);
int int_value = init_value(sizeof int_value, int_pattern);

unsigned char *long_pattern = num_pattern;
long long_value = init_value(sizeof long_value, num_pattern);
/* Do the to_bigend, then test */

/* byte */
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