#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include "ttwain_conversion.h"

#ifdef __cplusplus
extern "C" {
#endif

float TTWAIN_Fix32ToFloat(TW_FIX32 fix)
{
	TW_INT32 val;
	val = ((TW_INT32)fix.Whole << 16) | ((TW_UINT32)fix.Frac & 0xffff);
	return (float)(val / 65536.0);
}
/*---------------------------------------------------------------------------*/
TW_FIX32 TTWAIN_FloatToFix32(float fl)
{
	TW_FIX32 fix;
	TW_INT32 val;
	assert(sizeof(TW_FIX32) == sizeof(float));
	assert(sizeof(TW_FIX32) == sizeof(long));

	/* Note 1: This round-away-from-0 is new in TWAIN 1.7
   Note 2: ANSI C converts float to int by truncating toward 0.*/
	val = (TW_INT32)(fl * 65536.0 + (fl < 0 ? -0.5 : +0.5));
	fix.Whole = (TW_INT16)(val >> 16);	/* most significant 16 bits */
	fix.Frac = (TW_UINT16)(val & 0xffff); /* least */

	return fix;
}
/*---------------------------------------------------------------------------*/
void TTWAIN_ConvertRevStrToRevNum(const char *rev_str,
								  TW_UINT16 *maj_num,
								  TW_UINT16 *min_num)
{
	char *maj_str;
	char *min_str;
	size_t maj_size;
	size_t min_size;

	*maj_num = *min_num = 0;
	maj_size = strcspn(rev_str, ".");
	maj_str = (char *)calloc(sizeof(char), maj_size + 1);
	if (!maj_str)
		return;
	memcpy(maj_str, rev_str, maj_size); /*already 0term*/
	*maj_num = (TW_UINT16)atoi(maj_str);

	min_size = strlen(rev_str) - maj_size + 1;
	min_str = (char *)calloc(sizeof(char), min_size + 1);
	if (!min_str)
		return;
	memcpy(min_str, &(rev_str[maj_size + 1]), min_size); /*already 0term*/
	*min_num = (TW_UINT16)atoi(min_str);
	if (maj_str)
		free(maj_str);
	if (min_str)
		free(min_str);
}
/*---------------------------------------------------------------------------*/

#ifdef __cplusplus
}
#endif