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#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
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