UA_unbase64: 75| 100|UA_unbase64(const unsigned char *src, size_t len, size_t *out_len) { 76| | /* Empty base64 results in an empty byte-string */ 77| 100| if(len == 0) { ------------------ | Branch (77:8): [True: 0, False: 100] ------------------ 78| 0| *out_len = 0; 79| 0| return (unsigned char*)UA_EMPTY_ARRAY_SENTINEL; ------------------ | | 755| 0|#define UA_EMPTY_ARRAY_SENTINEL ((void*)0x01) ------------------ 80| 0| } 81| | 82| | /* Allocate the output string. Append four bytes to allow missing padding */ 83| 100| size_t olen = (len / 4 * 3) + 4; 84| 100| unsigned char *out = (unsigned char*)UA_malloc(olen); ------------------ | | 350| 100|# define UA_malloc(size) UA_mallocSingleton(size) ------------------ 85| 100| if(!out) ------------------ | Branch (85:8): [True: 0, False: 100] ------------------ 86| 0| return NULL; 87| | 88| | /* Iterate over the input */ 89| 100| size_t pad = 0; 90| 100| unsigned char count = 0; 91| 100| unsigned char block[4]; 92| 100| unsigned char *pos = out; 93| 1.96M| for(size_t i = 0; i < len; i++) { ------------------ | Branch (93:23): [True: 1.96M, False: 67] ------------------ 94| 1.96M| if(src[i] & 0x80) ------------------ | Branch (94:12): [True: 16, False: 1.96M] ------------------ 95| 16| goto error; /* Non-ASCII input */ 96| 1.96M| unsigned char tmp = dtable[src[i]]; 97| 1.96M| if(tmp == 0x80) ------------------ | Branch (97:12): [True: 13, False: 1.96M] ------------------ 98| 13| goto error; /* Not an allowed character */ 99| 1.96M| if(tmp == 0x7f) ------------------ | Branch (99:12): [True: 241, False: 1.96M] ------------------ 100| 241| continue; /* Whitespace is ignored to accomodate RFC 2045, used in 101| | * XML for xs:base64Binary. */ 102| 1.96M| block[count++] = tmp; 103| | 104| | /* Padding */ 105| 1.96M| if(src[i] == '=') { ------------------ | Branch (105:12): [True: 300, False: 1.96M] ------------------ 106| 300| if(count < 3) /* Padding can only be the last two bytes of a block */ ------------------ | Branch (106:16): [True: 3, False: 297] ------------------ 107| 3| goto error; 108| 297| block[count-1] = 0; 109| 297| pad++; 110| 1.96M| } else if(pad > 0) { ------------------ | Branch (110:19): [True: 1, False: 1.96M] ------------------ 111| 1| goto error; /* Padding not terminated correctly */ 112| 1| } 113| | 114| | /* Write three output characters for four characters of input */ 115| 1.96M| if(count == 4) { ------------------ | Branch (115:12): [True: 491k, False: 1.47M] ------------------ 116| 491k| if(pad > 2) ------------------ | Branch (116:16): [True: 0, False: 491k] ------------------ 117| 0| goto error; /* Invalid padding */ 118| 491k| *pos++ = (block[0] << 2) | (block[1] >> 4); 119| 491k| *pos++ = (block[1] << 4) | (block[2] >> 2); 120| 491k| *pos++ = (block[2] << 6) | block[3]; 121| 491k| count = 0; 122| 491k| pos -= pad; 123| 491k| pad = 0; 124| 491k| } 125| 1.96M| } 126| | 127| | /* Input length not a multiple of four */ 128| 67| if(count > 0) ------------------ | Branch (128:8): [True: 24, False: 43] ------------------ 129| 24| goto error; 130| | 131| 43| *out_len = (size_t)(pos - out); 132| 43| if(*out_len == 0) { ------------------ | Branch (132:8): [True: 8, False: 35] ------------------ 133| 8| UA_free(out); ------------------ | | 351| 8|# define UA_free(ptr) UA_freeSingleton(ptr) ------------------ 134| 8| return (unsigned char*)UA_EMPTY_ARRAY_SENTINEL; ------------------ | | 755| 8|#define UA_EMPTY_ARRAY_SENTINEL ((void*)0x01) ------------------ 135| 8| } 136| 35| return out; 137| | 138| 57| error: 139| 57| UA_free(out); ------------------ | | 351| 57|# define UA_free(ptr) UA_freeSingleton(ptr) ------------------ 140| | return NULL; 141| 43|} LLVMFuzzerTestOneInput: 18| 100|LLVMFuzzerTestOneInput(uint8_t *data, size_t size) { 19| 100| size_t retLen; 20| 100| unsigned char* ret = UA_unbase64(data, size, &retLen); 21| 100| if (retLen > 0) ------------------ | Branch (21:9): [True: 92, False: 8] ------------------ 22| 92| free(ret); 23| 100| return 0; 24| 100|}