Alexandre Lision | 7fd5d3d | 2013-12-04 13:06:40 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Operations on the usual buffers of bytes |
| 3 | */ |
| 4 | #ifndef BNSECURE |
| 5 | #define BNSECURE 1 |
| 6 | #endif |
| 7 | |
| 8 | /* |
| 9 | * These operations act on buffers of memory, just like malloc & free. |
| 10 | * One exception: it is not legal to pass a NULL pointer to lbnMemFree. |
| 11 | */ |
| 12 | |
| 13 | #ifndef lbnMemAlloc |
| 14 | void *lbnMemAlloc(unsigned bytes); |
| 15 | #endif |
| 16 | |
| 17 | #ifndef lbnMemFree |
| 18 | void lbnMemFree(void *ptr, unsigned bytes); |
| 19 | #endif |
| 20 | |
| 21 | /* This wipes out a buffer of bytes if necessary needed. */ |
| 22 | |
| 23 | #ifndef lbnMemWipe |
| 24 | #if BNSECURE |
| 25 | void lbnMemWipe(void *ptr, unsigned bytes); |
| 26 | #else |
| 27 | #define lbnMemWipe(ptr, bytes) (void)(ptr,bytes) |
| 28 | #endif |
| 29 | #endif /* !lbnMemWipe */ |
| 30 | |
| 31 | /* |
| 32 | * lbnRealloc is NOT like realloc(); it's endian-sensitive! |
| 33 | * If lbnMemRealloc is #defined, lbnRealloc will be defined in terms of it. |
| 34 | * It is legal to pass a NULL pointer to lbnRealloc, although oldbytes |
| 35 | * will always be sero. |
| 36 | */ |
| 37 | #ifndef lbnRealloc |
| 38 | void *lbnRealloc(void *ptr, unsigned oldbytes, unsigned newbytes); |
| 39 | #endif |
| 40 | |
| 41 | |
| 42 | /* |
| 43 | * These macros are the ones actually used most often in the math library. |
| 44 | * They take and return pointers to the *end* of the given buffer, and |
| 45 | * take sizes in terms of words, not bytes. |
| 46 | * |
| 47 | * Note that LBNALLOC takes the pointer as an argument instead of returning |
| 48 | * the value. |
| 49 | * |
| 50 | * Note also that these macros are only useable if you have included |
| 51 | * lbn.h (for the BIG and BIGLITTLE macros), which this file does NOT include. |
| 52 | */ |
| 53 | |
| 54 | #define LBNALLOC(p,type,words) BIGLITTLE( \ |
| 55 | if ( ((p) = (type *)lbnMemAlloc((words)*sizeof*(p))) != 0) \ |
| 56 | (p) += (words), \ |
| 57 | (p) = (type *)lbnMemAlloc((words) * sizeof*(p)) \ |
| 58 | ) |
| 59 | #define LBNFREE(p,words) lbnMemFree((p) BIG(-(words)), (words) * sizeof*(p)) |
| 60 | #define LBNREALLOC(p,old,new) \ |
| 61 | lbnRealloc(p, (old) * sizeof*(p), (new) * sizeof*(p)) |
| 62 | #define LBNWIPE(p,words) lbnMemWipe((p) BIG(-(words)), (words) * sizeof*(p)) |
| 63 | |