ref: e3aee39a389700ad821a1619f114e226c1bd42d0
dir: /sys/src/cmd/venti/srv/printarena.c/
#include "stdinc.h" #include "dat.h" #include "fns.h" void usage(void) { fprint(2, "usage: printarena arenafile [offset]\n"); threadexitsall("usage"); } static void rdarena(Arena *arena, u64int offset) { u64int a, aa, e; u32int magic; Clump cl; uchar score[VtScoreSize]; ZBlock *lump; printarena(2, arena); a = arena->base; e = arena->base + arena->size; if(offset != ~(u64int)0) { if(offset >= e-a) sysfatal("bad offset %llud >= %llud", offset, e-a); aa = offset; } else aa = 0; for(; aa < e; aa += ClumpSize+cl.info.size) { magic = clumpmagic(arena, aa); if(magic == ClumpFreeMagic) break; if(magic != arena->clumpmagic) { fprint(2, "illegal clump magic number %#8.8ux offset %llud\n", magic, aa); break; } lump = loadclump(arena, aa, 0, &cl, score, 0); if(lump == nil) { fprint(2, "clump %llud failed to read: %r\n", aa); break; } if(cl.info.type != VtCorruptType) { scoremem(score, lump->data, cl.info.uncsize); if(scorecmp(cl.info.score, score) != 0) { fprint(2, "clump %llud has mismatched score\n", aa); break; } if(vttypevalid(cl.info.type) < 0) { fprint(2, "clump %llud has bad type %d\n", aa, cl.info.type); break; } } print("%22llud %V %3d %5d\n", aa, score, cl.info.type, cl.info.uncsize); freezblock(lump); } print("end offset %llud\n", aa); } void threadmain(int argc, char *argv[]) { char *file; Arena *arena; u64int offset, aoffset; Part *part; static uchar buf[8192]; ArenaHead head; readonly = 1; /* for part.c */ aoffset = 0; ARGBEGIN{ case 'o': aoffset = strtoull(EARGF(usage()), 0, 0); break; default: usage(); break; }ARGEND offset = ~(u64int)0; switch(argc) { default: usage(); case 2: offset = strtoull(argv[1], 0, 0); /* fall through */ case 1: file = argv[0]; } ventifmtinstall(); statsinit(); part = initpart(file, OREAD|ODIRECT); if(part == nil) sysfatal("can't open file %s: %r", file); if(readpart(part, aoffset, buf, sizeof buf) < 0) sysfatal("can't read file %s: %r", file); if(unpackarenahead(&head, buf) < 0) sysfatal("corrupted arena header: %r"); print("# arena head version=%d name=%.*s blocksize=%d size=%lld clumpmagic=0x%.8ux\n", head.version, ANameSize, head.name, head.blocksize, head.size, head.clumpmagic); if(aoffset+head.size > part->size) sysfatal("arena is truncated: want %llud bytes have %llud", head.size, part->size); partblocksize(part, head.blocksize); initdcache(8 * MaxDiskBlock); arena = initarena(part, aoffset, head.size, head.blocksize); if(arena == nil) sysfatal("initarena: %r"); rdarena(arena, offset); threadexitsall(0); }