comparison: src/utils.c
src/utils.c
- changeset 674
- dc514a5d42a5
- parent 483
- 929016224c3c
- child 675
- 765cf785b7fa
equal
deleted
inserted
replaced
| 673:60fb6aec157d | 674:dc514a5d42a5 |
|---|---|
| 26 * POSSIBILITY OF SUCH DAMAGE. | 26 * POSSIBILITY OF SUCH DAMAGE. |
| 27 */ | 27 */ |
| 28 | 28 |
| 29 #include "cx/utils.h" | 29 #include "cx/utils.h" |
| 30 | 30 |
| 31 #ifndef CX_SZMUL_BUILTIN | 31 #define CX_STREAM_BCOPY_BUF_SIZE 8192 |
| 32 int cx_szmul_impl(size_t a, size_t b, size_t *result) { | 32 #define CX_STREAM_COPY_BUF_SIZE 1024 |
| 33 if(a == 0 || b == 0) { | 33 |
| 34 *result = 0; | 34 size_t cx_stream_bncopy( |
| 35 void *src, | |
| 36 void *dest, | |
| 37 cx_read_func rfnc, | |
| 38 cx_write_func wfnc, | |
| 39 char *buf, | |
| 40 size_t bufsize, | |
| 41 size_t n | |
| 42 ) { | |
| 43 if (n == 0) { | |
| 35 return 0; | 44 return 0; |
| 36 } | 45 } |
| 37 size_t r = a * b; | 46 |
| 38 if(r / b == a) { | 47 char *lbuf; |
| 39 *result = r; | 48 size_t ncp = 0; |
| 49 | |
| 50 if (buf) { | |
| 51 if (bufsize == 0) return 0; | |
| 52 lbuf = buf; | |
| 53 } else { | |
| 54 if (bufsize == 0) bufsize = CX_STREAM_BCOPY_BUF_SIZE; | |
| 55 lbuf = malloc(bufsize); | |
| 56 if (lbuf == NULL) { | |
| 57 return 0; | |
| 58 } | |
| 59 } | |
| 60 | |
| 61 size_t r; | |
| 62 size_t rn = bufsize > n ? n : bufsize; | |
| 63 while ((r = rfnc(lbuf, 1, rn, src)) != 0) { | |
| 64 r = wfnc(lbuf, 1, r, dest); | |
| 65 ncp += r; | |
| 66 n -= r; | |
| 67 rn = bufsize > n ? n : bufsize; | |
| 68 if (r == 0 || n == 0) { | |
| 69 break; | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 if (lbuf != buf) { | |
| 74 free(lbuf); | |
| 75 } | |
| 76 | |
| 77 return ncp; | |
| 78 } | |
| 79 | |
| 80 size_t cx_stream_ncopy( | |
| 81 void *src, | |
| 82 void *dest, | |
| 83 cx_read_func rfnc, | |
| 84 cx_write_func wfnc, | |
| 85 size_t n | |
| 86 ) { | |
| 87 if (n == 0) { | |
| 40 return 0; | 88 return 0; |
| 41 } else { | |
| 42 *result = 0; | |
| 43 return 1; | |
| 44 } | 89 } |
| 90 | |
| 91 const size_t bufsize = CX_STREAM_COPY_BUF_SIZE; | |
| 92 char lbuf[bufsize]; | |
| 93 size_t ncp = 0; | |
| 94 | |
| 95 size_t r; | |
| 96 size_t rn = bufsize > n ? n : bufsize; | |
| 97 while ((r = rfnc(lbuf, 1, rn, src)) != 0) { | |
| 98 r = wfnc(lbuf, 1, r, dest); | |
| 99 ncp += r; | |
| 100 n -= r; | |
| 101 rn = bufsize > n ? n : bufsize; | |
| 102 if (r == 0 || n == 0) { | |
| 103 break; | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 return ncp; | |
| 45 } | 108 } |
| 109 | |
| 110 #ifndef CX_SZMUL_BUILTIN | |
| 111 #include "szmul.c" | |
| 46 #endif | 112 #endif |
