1
2
3 #include <assert.h>
4 #include <string.h>
5 #include <stdlib.h>
6 #include "ttwain_conversion.h"
7
8 #ifdef __cplusplus
9 extern "C" {
10 #endif
11
TTWAIN_Fix32ToFloat(TW_FIX32 fix)12 float TTWAIN_Fix32ToFloat(TW_FIX32 fix) {
13 TW_INT32 val;
14 val = ((TW_INT32)fix.Whole << 16) | ((TW_UINT32)fix.Frac & 0xffff);
15 return (float)(val / 65536.0);
16 }
17 /*---------------------------------------------------------------------------*/
TTWAIN_FloatToFix32(float fl)18 TW_FIX32 TTWAIN_FloatToFix32(float fl) {
19 TW_FIX32 fix;
20 TW_INT32 val;
21 assert(sizeof(TW_FIX32) == sizeof(float));
22 assert(sizeof(TW_FIX32) == sizeof(long));
23
24 /* Note 1: This round-away-from-0 is new in TWAIN 1.7
25 Note 2: ANSI C converts float to int by truncating toward 0.*/
26 val = (TW_INT32)(fl * 65536.0 + (fl < 0 ? -0.5 : +0.5));
27 fix.Whole = (TW_INT16)(val >> 16); /* most significant 16 bits */
28 fix.Frac = (TW_UINT16)(val & 0xffff); /* least */
29
30 return fix;
31 }
32 /*---------------------------------------------------------------------------*/
TTWAIN_ConvertRevStrToRevNum(const char * rev_str,TW_UINT16 * maj_num,TW_UINT16 * min_num)33 void TTWAIN_ConvertRevStrToRevNum(const char *rev_str, TW_UINT16 *maj_num,
34 TW_UINT16 *min_num) {
35 char *maj_str;
36 char *min_str;
37 size_t maj_size;
38 size_t min_size;
39
40 *maj_num = *min_num = 0;
41 maj_size = strcspn(rev_str, ".");
42 maj_str = (char *)calloc(sizeof(char), maj_size + 1);
43 if (!maj_str) return;
44 memcpy(maj_str, rev_str, maj_size); /*already 0term*/
45 *maj_num = (TW_UINT16)atoi(maj_str);
46
47 min_size = strlen(rev_str) - maj_size + 1;
48 min_str = (char *)calloc(sizeof(char), min_size + 1);
49 if (!min_str) return;
50 memcpy(min_str, &(rev_str[maj_size + 1]), min_size); /*already 0term*/
51 *min_num = (TW_UINT16)atoi(min_str);
52 if (maj_str) free(maj_str);
53 if (min_str) free(min_str);
54 }
55 /*---------------------------------------------------------------------------*/
56
57 #ifdef __cplusplus
58 }
59 #endif
60