59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include "ttwain_conversion.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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float TTWAIN_Fix32ToFloat(TW_FIX32 fix) {
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TW_INT32 val;
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val = ((TW_INT32)fix.Whole << 16) | ((TW_UINT32)fix.Frac & 0xffff);
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return (float)(val / 65536.0);
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}
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/*---------------------------------------------------------------------------*/
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TW_FIX32 TTWAIN_FloatToFix32(float fl) {
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TW_FIX32 fix;
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TW_INT32 val;
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assert(sizeof(TW_FIX32) == sizeof(float));
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assert(sizeof(TW_FIX32) == sizeof(long));
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/* Note 1: This round-away-from-0 is new in TWAIN 1.7
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Note 2: ANSI C converts float to int by truncating toward 0.*/
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val = (TW_INT32)(fl * 65536.0 + (fl < 0 ? -0.5 : +0.5));
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fix.Whole = (TW_INT16)(val >> 16); /* most significant 16 bits */
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fix.Frac = (TW_UINT16)(val & 0xffff); /* least */
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return fix;
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}
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/*---------------------------------------------------------------------------*/
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void TTWAIN_ConvertRevStrToRevNum(const char *rev_str, TW_UINT16 *maj_num,
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TW_UINT16 *min_num) {
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char *maj_str;
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char *min_str;
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size_t maj_size;
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size_t min_size;
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*maj_num = *min_num = 0;
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maj_size = strcspn(rev_str, ".");
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maj_str = (char *)calloc(sizeof(char), maj_size + 1);
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if (!maj_str) return;
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memcpy(maj_str, rev_str, maj_size); /*already 0term*/
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*maj_num = (TW_UINT16)atoi(maj_str);
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min_size = strlen(rev_str) - maj_size + 1;
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min_str = (char *)calloc(sizeof(char), min_size + 1);
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if (!min_str) return;
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memcpy(min_str, &(rev_str[maj_size + 1]), min_size); /*already 0term*/
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*min_num = (TW_UINT16)atoi(min_str);
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if (maj_str) free(maj_str);
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if (min_str) free(min_str);
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}
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/*---------------------------------------------------------------------------*/
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#ifdef __cplusplus
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}
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#endif
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