diff options
| author | Kevin Pan <bit.kevin@gmail.com> | 2018-03-16 13:40:50 +0800 |
|---|---|---|
| committer | Kevin Pan <bit.kevin@gmail.com> | 2018-03-21 11:57:57 +0800 |
| commit | bcab47bc1b2bfdd29f8b89f8a211755299938aea (patch) | |
| tree | fc38e72e16bf81f38584c8dba718270e4bfc009c /src | |
| parent | 7be9a9a570c1140048f8781ced1111e1d930e517 (diff) | |
use base58 map instead of strchr()
Diffstat (limited to 'src')
| -rw-r--r-- | src/base58.cpp | 25 | ||||
| -rw-r--r-- | src/test/data/base58_encode_decode.json | 4 |
2 files changed, 24 insertions, 5 deletions
diff --git a/src/base58.cpp b/src/base58.cpp index 982e123a1d..feec2d4e05 100644 --- a/src/base58.cpp +++ b/src/base58.cpp @@ -12,6 +12,24 @@ /** All alphanumeric characters except for "0", "I", "O", and "l" */ static const char* pszBase58 = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"; +static const int8_t mapBase58[256] = { + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, + -1, 0, 1, 2, 3, 4, 5, 6, 7, 8,-1,-1,-1,-1,-1,-1, + -1, 9,10,11,12,13,14,15, 16,-1,17,18,19,20,21,-1, + 22,23,24,25,26,27,28,29, 30,31,32,-1,-1,-1,-1,-1, + -1,33,34,35,36,37,38,39, 40,41,42,43,-1,44,45,46, + 47,48,49,50,51,52,53,54, 55,56,57,-1,-1,-1,-1,-1, + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, + -1,-1,-1,-1,-1,-1,-1,-1, -1,-1,-1,-1,-1,-1,-1,-1, +}; bool DecodeBase58(const char* psz, std::vector<unsigned char>& vch) { @@ -29,13 +47,12 @@ bool DecodeBase58(const char* psz, std::vector<unsigned char>& vch) int size = strlen(psz) * 733 /1000 + 1; // log(58) / log(256), rounded up. std::vector<unsigned char> b256(size); // Process the characters. + static_assert(sizeof(mapBase58)/sizeof(mapBase58[0]) == 256, "mapBase58.size() should be 256"); // guarantee not out of range while (*psz && !isspace(*psz)) { // Decode base58 character - const char* ch = strchr(pszBase58, *psz); - if (ch == nullptr) + int carry = mapBase58[(uint8_t)*psz]; + if (carry == -1) // Invalid b58 character return false; - // Apply "b256 = b256 * 58 + ch". - int carry = ch - pszBase58; int i = 0; for (std::vector<unsigned char>::reverse_iterator it = b256.rbegin(); (carry != 0 || i < length) && (it != b256.rend()); ++it, ++i) { carry += 58 * (*it); diff --git a/src/test/data/base58_encode_decode.json b/src/test/data/base58_encode_decode.json index 9448f256d9..1a4bd7f458 100644 --- a/src/test/data/base58_encode_decode.json +++ b/src/test/data/base58_encode_decode.json @@ -10,5 +10,7 @@ ["572e4794", "3EFU7m"], ["ecac89cad93923c02321", "EJDM8drfXA6uyA"], ["10c8511e", "Rt5zm"], -["00000000000000000000", "1111111111"] +["00000000000000000000", "1111111111"], +["000111d38e5fc9071ffcd20b4a763cc9ae4f252bb4e48fd66a835e252ada93ff480d6dd43dc62a641155a5", "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"], +["000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff", "1cWB5HCBdLjAuqGGReWE3R3CguuwSjw6RHn39s2yuDRTS5NsBgNiFpWgAnEx6VQi8csexkgYw3mdYrMHr8x9i7aEwP8kZ7vccXWqKDvGv3u1GxFKPuAkn8JCPPGDMf3vMMnbzm6Nh9zh1gcNsMvH3ZNLmP5fSG6DGbbi2tuwMWPthr4boWwCxf7ewSgNQeacyozhKDDQQ1qL5fQFUW52QKUZDZ5fw3KXNQJMcNTcaB723LchjeKun7MuGW5qyCBZYzA1KjofN1gYBV3NqyhQJ3Ns746GNuf9N2pQPmHz4xpnSrrfCvy6TVVz5d4PdrjeshsWQwpZsZGzvbdAdN8MKV5QsBDY"] ] |