diff options
Diffstat (limited to 'third_party/git/base85.c')
-rw-r--r-- | third_party/git/base85.c | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/third_party/git/base85.c b/third_party/git/base85.c deleted file mode 100644 index 5ca601ee14fd..000000000000 --- a/third_party/git/base85.c +++ /dev/null @@ -1,132 +0,0 @@ -#include "cache.h" - -#undef DEBUG_85 - -#ifdef DEBUG_85 -#define say(a) fprintf(stderr, a) -#define say1(a,b) fprintf(stderr, a, b) -#define say2(a,b,c) fprintf(stderr, a, b, c) -#else -#define say(a) do { /* nothing */ } while (0) -#define say1(a,b) do { /* nothing */ } while (0) -#define say2(a,b,c) do { /* nothing */ } while (0) -#endif - -static const char en85[] = { - '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', - 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', - 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', - 'U', 'V', 'W', 'X', 'Y', 'Z', - 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', - 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', - 'u', 'v', 'w', 'x', 'y', 'z', - '!', '#', '$', '%', '&', '(', ')', '*', '+', '-', - ';', '<', '=', '>', '?', '@', '^', '_', '`', '{', - '|', '}', '~' -}; - -static char de85[256]; -static void prep_base85(void) -{ - int i; - if (de85['Z']) - return; - for (i = 0; i < ARRAY_SIZE(en85); i++) { - int ch = en85[i]; - de85[ch] = i + 1; - } -} - -int decode_85(char *dst, const char *buffer, int len) -{ - prep_base85(); - - say2("decode 85 <%.*s>", len / 4 * 5, buffer); - while (len) { - unsigned acc = 0; - int de, cnt = 4; - unsigned char ch; - do { - ch = *buffer++; - de = de85[ch]; - if (--de < 0) - return error("invalid base85 alphabet %c", ch); - acc = acc * 85 + de; - } while (--cnt); - ch = *buffer++; - de = de85[ch]; - if (--de < 0) - return error("invalid base85 alphabet %c", ch); - /* Detect overflow. */ - if (0xffffffff / 85 < acc || - 0xffffffff - de < (acc *= 85)) - return error("invalid base85 sequence %.5s", buffer-5); - acc += de; - say1(" %08x", acc); - - cnt = (len < 4) ? len : 4; - len -= cnt; - do { - acc = (acc << 8) | (acc >> 24); - *dst++ = acc; - } while (--cnt); - } - say("\n"); - - return 0; -} - -void encode_85(char *buf, const unsigned char *data, int bytes) -{ - say("encode 85"); - while (bytes) { - unsigned acc = 0; - int cnt; - for (cnt = 24; cnt >= 0; cnt -= 8) { - unsigned ch = *data++; - acc |= ch << cnt; - if (--bytes == 0) - break; - } - say1(" %08x", acc); - for (cnt = 4; cnt >= 0; cnt--) { - int val = acc % 85; - acc /= 85; - buf[cnt] = en85[val]; - } - buf += 5; - } - say("\n"); - - *buf = 0; -} - -#ifdef DEBUG_85 -int main(int ac, char **av) -{ - char buf[1024]; - - if (!strcmp(av[1], "-e")) { - int len = strlen(av[2]); - encode_85(buf, av[2], len); - if (len <= 26) len = len + 'A' - 1; - else len = len + 'a' - 26 - 1; - printf("encoded: %c%s\n", len, buf); - return 0; - } - if (!strcmp(av[1], "-d")) { - int len = *av[2]; - if ('A' <= len && len <= 'Z') len = len - 'A' + 1; - else len = len - 'a' + 26 + 1; - decode_85(buf, av[2]+1, len); - printf("decoded: %.*s\n", len, buf); - return 0; - } - if (!strcmp(av[1], "-t")) { - char t[4] = { -1,-1,-1,-1 }; - encode_85(buf, t, 4); - printf("encoded: D%s\n", buf); - return 0; - } -} -#endif |