1 7763a61a 2003-11-23 devnull #include "stdinc.h"
  2 7763a61a 2003-11-23 devnull #include <bio.h>
  3 7763a61a 2003-11-23 devnull 
  4 7763a61a 2003-11-23 devnull typedef struct Source Source;
  5 7763a61a 2003-11-23 devnull 
  6 7763a61a 2003-11-23 devnull struct Source
  7 7763a61a 2003-11-23 devnull {
  8 7763a61a 2003-11-23 devnull 	ulong gen;
  9 7763a61a 2003-11-23 devnull 	int psize;
 10 7763a61a 2003-11-23 devnull 	int dsize;
 11 7763a61a 2003-11-23 devnull 	int dir;
 12 7763a61a 2003-11-23 devnull 	int active;
 13 7763a61a 2003-11-23 devnull 	int depth;
 14 7763a61a 2003-11-23 devnull 	uvlong size;
 15 7763a61a 2003-11-23 devnull 	uchar score[VtScoreSize];
 16 7763a61a 2003-11-23 devnull 	int reserved;
 17 7763a61a 2003-11-23 devnull };
 18 7763a61a 2003-11-23 devnull 
 19 7763a61a 2003-11-23 devnull int bsize;
 20 7763a61a 2003-11-23 devnull Biobuf *bout;
 21 7763a61a 2003-11-23 devnull VtRoot root;
 22 7763a61a 2003-11-23 devnull int ver;
 23 7763a61a 2003-11-23 devnull int cmp;
 24 7763a61a 2003-11-23 devnull int all;
 25 7763a61a 2003-11-23 devnull int find;
 26 7763a61a 2003-11-23 devnull uchar fscore[VtScoreSize];
 27 7763a61a 2003-11-23 devnull VtSession *z;
 28 7763a61a 2003-11-23 devnull 
 29 7763a61a 2003-11-23 devnull int vtGetUint16(uchar *p);
 30 7763a61a 2003-11-23 devnull ulong vtGetUint32(uchar *p);
 31 7763a61a 2003-11-23 devnull uvlong vtGetUint48(uchar *p);
 32 7763a61a 2003-11-23 devnull void usage(void);
 33 7763a61a 2003-11-23 devnull int parseScore(uchar *score, char *buf, int n);
 34 7763a61a 2003-11-23 devnull void readRoot(VtRoot*, uchar *score, char *file);
 35 7763a61a 2003-11-23 devnull int dumpDir(Source*, int indent);
 36 7763a61a 2003-11-23 devnull 
 37 7763a61a 2003-11-23 devnull void
 38 7763a61a 2003-11-23 devnull main(int argc, char *argv[])
 39 7763a61a 2003-11-23 devnull {
 40 7763a61a 2003-11-23 devnull 	char *host = nil;
 41 7763a61a 2003-11-23 devnull 	uchar score[VtScoreSize];
 42 7763a61a 2003-11-23 devnull 	Source source;
 43 7763a61a 2003-11-23 devnull 	uchar buf[VtMaxLumpSize];
 44 7763a61a 2003-11-23 devnull 	char *p;
 45 7763a61a 2003-11-23 devnull 	int n;
 46 7763a61a 2003-11-23 devnull 
 47 7763a61a 2003-11-23 devnull 	ARGBEGIN{
 48 7763a61a 2003-11-23 devnull 	case 'h':
 49 7763a61a 2003-11-23 devnull 		host = ARGF();
 50 7763a61a 2003-11-23 devnull 		break;
 51 7763a61a 2003-11-23 devnull 	case 'c':
 52 7763a61a 2003-11-23 devnull 		cmp++;
 53 7763a61a 2003-11-23 devnull 		break;
 54 7763a61a 2003-11-23 devnull 	case 'f':
 55 7763a61a 2003-11-23 devnull 		find++;
 56 7763a61a 2003-11-23 devnull 		p = ARGF();
 57 7763a61a 2003-11-23 devnull 		if(p == nil || !parseScore(fscore, p, strlen(p)))
 58 7763a61a 2003-11-23 devnull 			usage();
 59 7763a61a 2003-11-23 devnull 		break;
 60 7763a61a 2003-11-23 devnull 	case 'a':
 61 7763a61a 2003-11-23 devnull 		all = 1;
 62 7763a61a 2003-11-23 devnull 		break;
 63 7763a61a 2003-11-23 devnull 	}ARGEND
 64 7763a61a 2003-11-23 devnull 
 65 7763a61a 2003-11-23 devnull 	vtAttach();
 66 7763a61a 2003-11-23 devnull 
 67 7763a61a 2003-11-23 devnull 	bout = vtMemAllocZ(sizeof(Biobuf));
 68 7763a61a 2003-11-23 devnull 	Binit(bout, 1, OWRITE);
 69 7763a61a 2003-11-23 devnull 
 70 7763a61a 2003-11-23 devnull 	if(argc > 1)
 71 7763a61a 2003-11-23 devnull 		usage();
 72 7763a61a 2003-11-23 devnull 
 73 7763a61a 2003-11-23 devnull 	vtAttach();
 74 7763a61a 2003-11-23 devnull 
 75 7763a61a 2003-11-23 devnull 	fmtinstall('V', vtScoreFmt);
 76 7763a61a 2003-11-23 devnull 	fmtinstall('R', vtErrFmt);
 77 7763a61a 2003-11-23 devnull 
 78 7763a61a 2003-11-23 devnull 	z = vtDial(host, 0);
 79 7763a61a 2003-11-23 devnull 	if(z == nil)
 80 7763a61a 2003-11-23 devnull 		vtFatal("could not connect to server: %s", vtGetError());
 81 7763a61a 2003-11-23 devnull 
 82 7763a61a 2003-11-23 devnull 	if(!vtConnect(z, 0))
 83 7763a61a 2003-11-23 devnull 		sysfatal("vtConnect: %r");
 84 7763a61a 2003-11-23 devnull 
 85 7763a61a 2003-11-23 devnull 	readRoot(&root, score, argv[0]);
 86 7763a61a 2003-11-23 devnull 	ver = root.version;
 87 7763a61a 2003-11-23 devnull 	bsize = root.blockSize;
 88 7763a61a 2003-11-23 devnull 	if(!find) {
 89 7763a61a 2003-11-23 devnull 		Bprint(bout, "score: %V\n", score);
 90 7763a61a 2003-11-23 devnull 		Bprint(bout, "version: %d\n", ver);
 91 7763a61a 2003-11-23 devnull 		Bprint(bout, "name: %s\n", root.name);
 92 7763a61a 2003-11-23 devnull 		Bprint(bout, "type: %s\n", root.type);
 93 7763a61a 2003-11-23 devnull 		Bprint(bout, "bsize: %d\n", bsize);
 94 7763a61a 2003-11-23 devnull 		Bprint(bout, "prev: %V\n", root.prev);
 95 7763a61a 2003-11-23 devnull 	}
 96 7763a61a 2003-11-23 devnull 
 97 7763a61a 2003-11-23 devnull 	switch(ver) {
 98 7763a61a 2003-11-23 devnull 	default:
 99 7763a61a 2003-11-23 devnull 		sysfatal("unknown version");
100 7763a61a 2003-11-23 devnull 	case VtRootVersion:
101 7763a61a 2003-11-23 devnull 		break;
102 7763a61a 2003-11-23 devnull 	}
103 7763a61a 2003-11-23 devnull 
104 7763a61a 2003-11-23 devnull 	n = vtRead(z, root.score, VtDirType, buf, bsize);
105 7763a61a 2003-11-23 devnull 	if(n < 0)
106 7763a61a 2003-11-23 devnull 		sysfatal("could not read root dir");
107 7763a61a 2003-11-23 devnull 
108 7763a61a 2003-11-23 devnull 	/* fake up top level source */
109 7763a61a 2003-11-23 devnull 	memset(&source, 0, sizeof(source));
110 7763a61a 2003-11-23 devnull 	memmove(source.score, root.score, VtScoreSize);
111 7763a61a 2003-11-23 devnull 	source.psize = bsize;
112 7763a61a 2003-11-23 devnull 	source.dsize = bsize;
113 7763a61a 2003-11-23 devnull 	source.dir = 1;
114 7763a61a 2003-11-23 devnull 	source.active = 1;
115 7763a61a 2003-11-23 devnull 	source.depth = 0;
116 7763a61a 2003-11-23 devnull 	source.size = n;
117 7763a61a 2003-11-23 devnull 
118 7763a61a 2003-11-23 devnull 	dumpDir(&source, 0);
119 7763a61a 2003-11-23 devnull 
120 7763a61a 2003-11-23 devnull 	Bterm(bout);
121 7763a61a 2003-11-23 devnull 
122 7763a61a 2003-11-23 devnull 	vtClose(z);
123 7763a61a 2003-11-23 devnull 	vtDetach();
124 7763a61a 2003-11-23 devnull 	exits(0);
125 7763a61a 2003-11-23 devnull }
126 7763a61a 2003-11-23 devnull 
127 7763a61a 2003-11-23 devnull void
128 7763a61a 2003-11-23 devnull sourcePrint(Source *s, int indent, int entry)
129 7763a61a 2003-11-23 devnull {
130 7763a61a 2003-11-23 devnull 	int i;
131 7763a61a 2003-11-23 devnull 	uvlong size;
132 7763a61a 2003-11-23 devnull 	int ne;
133 7763a61a 2003-11-23 devnull 
134 7763a61a 2003-11-23 devnull 	for(i=0; i<indent; i++)
135 7763a61a 2003-11-23 devnull 		Bprint(bout, " ");
136 7763a61a 2003-11-23 devnull 	Bprint(bout, "%4d", entry);
137 7763a61a 2003-11-23 devnull 	if(s->active) {
138 7763a61a 2003-11-23 devnull 		/* dir size in directory entries */
139 7763a61a 2003-11-23 devnull 		if(s->dir) {
140 7763a61a 2003-11-23 devnull 			ne = s->dsize/VtEntrySize;
141 7763a61a 2003-11-23 devnull 			size = ne*(s->size/s->dsize) + (s->size%s->dsize)/VtEntrySize;
142 7763a61a 2003-11-23 devnull 		} else 
143 7763a61a 2003-11-23 devnull 			size = s->size;
144 7763a61a 2003-11-23 devnull 		if(cmp) {
145 7763a61a 2003-11-23 devnull 			Bprint(bout, ": gen: %lud size: %llud",
146 7763a61a 2003-11-23 devnull 				s->gen, size);
147 7763a61a 2003-11-23 devnull 			if(!s->dir)
148 7763a61a 2003-11-23 devnull 				Bprint(bout, ": %V", s->score);
149 7763a61a 2003-11-23 devnull 		} else {
150 7763a61a 2003-11-23 devnull 			Bprint(bout, ": gen: %lud psize: %d dsize: %d",
151 7763a61a 2003-11-23 devnull 				s->gen, s->psize, s->dsize);
152 7763a61a 2003-11-23 devnull 			Bprint(bout, " depth: %d size: %llud: %V",
153 7763a61a 2003-11-23 devnull 				s->depth, size, s->score);
154 7763a61a 2003-11-23 devnull 		}
155 7763a61a 2003-11-23 devnull 		
156 7763a61a 2003-11-23 devnull 		if(s->reserved)
157 7763a61a 2003-11-23 devnull 			Bprint(bout, ": reserved not emtpy");
158 7763a61a 2003-11-23 devnull 	}
159 7763a61a 2003-11-23 devnull 	Bprint(bout, "\n");
160 7763a61a 2003-11-23 devnull }
161 7763a61a 2003-11-23 devnull 
162 7763a61a 2003-11-23 devnull int
163 7763a61a 2003-11-23 devnull parse(Source *s, uchar *p)
164 7763a61a 2003-11-23 devnull {
165 7763a61a 2003-11-23 devnull 	VtEntry dir;
166 7763a61a 2003-11-23 devnull 
167 7763a61a 2003-11-23 devnull 	memset(s, 0, sizeof(*s));
168 7763a61a 2003-11-23 devnull 	if(!vtEntryUnpack(&dir, p, 0))
169 7763a61a 2003-11-23 devnull 		return 0;
170 7763a61a 2003-11-23 devnull 
171 7763a61a 2003-11-23 devnull 	if(!(dir.flags & VtEntryActive))
172 7763a61a 2003-11-23 devnull 		return 1;
173 7763a61a 2003-11-23 devnull 
174 7763a61a 2003-11-23 devnull 	s->active = 1;
175 7763a61a 2003-11-23 devnull 	s->gen = dir.gen;
176 7763a61a 2003-11-23 devnull 	s->psize = dir.psize;
177 7763a61a 2003-11-23 devnull 	s->dsize = dir.size;
178 7763a61a 2003-11-23 devnull 	s->size = dir.size;
179 7763a61a 2003-11-23 devnull 	memmove(s->score, dir.score, VtScoreSize);
180 7763a61a 2003-11-23 devnull 	if(dir.flags & VtEntryDir)
181 7763a61a 2003-11-23 devnull 		s->dir = 1;
182 7763a61a 2003-11-23 devnull 	s->depth = dir.depth;
183 7763a61a 2003-11-23 devnull 	return 1;
184 7763a61a 2003-11-23 devnull 
185 7763a61a 2003-11-23 devnull }
186 7763a61a 2003-11-23 devnull 
187 7763a61a 2003-11-23 devnull int
188 7763a61a 2003-11-23 devnull sourceRead(Source *s, ulong block, uchar *p, int n)
189 7763a61a 2003-11-23 devnull {
190 7763a61a 2003-11-23 devnull 	uchar buf[VtMaxLumpSize];
191 7763a61a 2003-11-23 devnull 	uchar score[VtScoreSize];
192 7763a61a 2003-11-23 devnull 	int i, nn, np, type;
193 7763a61a 2003-11-23 devnull 	int elem[VtPointerDepth];
194 7763a61a 2003-11-23 devnull 
195 7763a61a 2003-11-23 devnull 	memmove(score, s->score, VtScoreSize);
196 7763a61a 2003-11-23 devnull 
197 7763a61a 2003-11-23 devnull 	np = s->psize/VtScoreSize;
198 7763a61a 2003-11-23 devnull 	for(i=0; i<s->depth; i++) {
199 7763a61a 2003-11-23 devnull 		elem[i] = block % np;
200 7763a61a 2003-11-23 devnull 		block /= np;
201 7763a61a 2003-11-23 devnull 	}
202 7763a61a 2003-11-23 devnull 	assert(block == 0);
203 7763a61a 2003-11-23 devnull 
204 7763a61a 2003-11-23 devnull 	for(i=s->depth-1; i>=0; i--) {
205 7763a61a 2003-11-23 devnull 		nn = vtRead(z, score, VtPointerType0+i, buf, s->psize);
206 7763a61a 2003-11-23 devnull 		if(nn < 0)
207 7763a61a 2003-11-23 devnull 			return -1;
208 7763a61a 2003-11-23 devnull 
209 7763a61a 2003-11-23 devnull 		if(!vtSha1Check(score, buf, nn)) {
210 7763a61a 2003-11-23 devnull 			vtSetError("vtSha1Check failed on root block");
211 7763a61a 2003-11-23 devnull 			return -1;
212 7763a61a 2003-11-23 devnull 		}
213 7763a61a 2003-11-23 devnull 
214 7763a61a 2003-11-23 devnull 		if((elem[i]+1)*VtScoreSize > nn)
215 7763a61a 2003-11-23 devnull 			return 0;
216 7763a61a 2003-11-23 devnull 		memmove(score, buf + elem[i]*VtScoreSize, VtScoreSize);
217 7763a61a 2003-11-23 devnull 	}
218 7763a61a 2003-11-23 devnull 
219 7763a61a 2003-11-23 devnull 	if(s->dir)
220 7763a61a 2003-11-23 devnull 		type = VtDirType;
221 7763a61a 2003-11-23 devnull 	else
222 7763a61a 2003-11-23 devnull 		type = VtDataType;
223 7763a61a 2003-11-23 devnull 
224 7763a61a 2003-11-23 devnull 	nn = vtRead(z, score, type, p, n);
225 7763a61a 2003-11-23 devnull 	if(nn < 0)
226 7763a61a 2003-11-23 devnull 		return -1;
227 7763a61a 2003-11-23 devnull 
228 7763a61a 2003-11-23 devnull 	if(!vtSha1Check(score, p, nn)) {
229 7763a61a 2003-11-23 devnull 		vtSetError("vtSha1Check failed on root block");
230 7763a61a 2003-11-23 devnull 		return -1;
231 7763a61a 2003-11-23 devnull 	}
232 7763a61a 2003-11-23 devnull 	
233 7763a61a 2003-11-23 devnull 	return nn;
234 7763a61a 2003-11-23 devnull }
235 7763a61a 2003-11-23 devnull 
236 7763a61a 2003-11-23 devnull void
237 7763a61a 2003-11-23 devnull dumpFileContents(Source *s)
238 7763a61a 2003-11-23 devnull {
239 7763a61a 2003-11-23 devnull 	int nb, lb, i, n;
240 7763a61a 2003-11-23 devnull 	uchar buf[VtMaxLumpSize];
241 7763a61a 2003-11-23 devnull 
242 7763a61a 2003-11-23 devnull 	nb = (s->size + s->dsize - 1)/s->dsize;
243 7763a61a 2003-11-23 devnull 	lb = s->size%s->dsize;
244 7763a61a 2003-11-23 devnull 	for(i=0; i<nb; i++) {
245 7763a61a 2003-11-23 devnull 		memset(buf, 0, s->dsize);
246 7763a61a 2003-11-23 devnull 		n = sourceRead(s, i, buf, s->dsize);
247 7763a61a 2003-11-23 devnull 		if(n < 0) {	
248 7763a61a 2003-11-23 devnull 			fprint(2, "could not read block: %d: %s\n", i, vtGetError());
249 7763a61a 2003-11-23 devnull 			continue;
250 7763a61a 2003-11-23 devnull 		}
251 7763a61a 2003-11-23 devnull 		if(i < nb-1)
252 7763a61a 2003-11-23 devnull 			Bwrite(bout, buf, s->dsize);
253 7763a61a 2003-11-23 devnull 		else
254 7763a61a 2003-11-23 devnull 			Bwrite(bout, buf, lb);
255 7763a61a 2003-11-23 devnull 	}
256 7763a61a 2003-11-23 devnull }
257 7763a61a 2003-11-23 devnull 
258 7763a61a 2003-11-23 devnull void
259 7763a61a 2003-11-23 devnull dumpFile(Source *s, int indent)
260 7763a61a 2003-11-23 devnull {
261 7763a61a 2003-11-23 devnull 	int nb, i, j, n;
262 7763a61a 2003-11-23 devnull 	uchar buf[VtMaxLumpSize];
263 7763a61a 2003-11-23 devnull 	uchar score[VtScoreSize];
264 7763a61a 2003-11-23 devnull 
265 7763a61a 2003-11-23 devnull 	nb = (s->size + s->dsize - 1)/s->dsize;
266 7763a61a 2003-11-23 devnull 	for(i=0; i<nb; i++) {
267 7763a61a 2003-11-23 devnull 		memset(buf, 0, s->dsize);
268 7763a61a 2003-11-23 devnull 		n = sourceRead(s, i, buf, s->dsize);
269 7763a61a 2003-11-23 devnull 		if(n < 0) {	
270 7763a61a 2003-11-23 devnull 			fprint(2, "could not read block: %d: %s\n", i, vtGetError());
271 7763a61a 2003-11-23 devnull 			continue;
272 7763a61a 2003-11-23 devnull 		}
273 7763a61a 2003-11-23 devnull 		for(j=0; j<indent; j++)
274 7763a61a 2003-11-23 devnull 			Bprint(bout, " ");
275 7763a61a 2003-11-23 devnull 		vtSha1(score, buf, n);		
276 7763a61a 2003-11-23 devnull 		Bprint(bout, "%4d: size: %ud: %V\n", i, n, score);
277 7763a61a 2003-11-23 devnull 	}
278 7763a61a 2003-11-23 devnull }
279 7763a61a 2003-11-23 devnull 
280 7763a61a 2003-11-23 devnull int
281 7763a61a 2003-11-23 devnull dumpDir(Source *s, int indent)
282 7763a61a 2003-11-23 devnull {
283 7763a61a 2003-11-23 devnull 	int pb, ne, nb, i, j, n, entry;
284 7763a61a 2003-11-23 devnull 	uchar buf[VtMaxLumpSize];
285 7763a61a 2003-11-23 devnull 	Source ss;
286 7763a61a 2003-11-23 devnull 
287 7763a61a 2003-11-23 devnull 	pb = s->dsize/VtEntrySize;
288 7763a61a 2003-11-23 devnull 	ne = pb*(s->size/s->dsize) + (s->size%s->dsize)/VtEntrySize;
289 7763a61a 2003-11-23 devnull 	nb = (s->size + s->dsize - 1)/s->dsize;
290 7763a61a 2003-11-23 devnull 	for(i=0; i<nb; i++) {
291 7763a61a 2003-11-23 devnull 		memset(buf, 0, s->dsize);
292 7763a61a 2003-11-23 devnull 		n = sourceRead(s, i, buf, s->dsize);
293 7763a61a 2003-11-23 devnull 		if(n < 0) {	
294 7763a61a 2003-11-23 devnull 			fprint(2, "could not read block: %d: %s\n", i, vtGetError());
295 7763a61a 2003-11-23 devnull 			continue;
296 7763a61a 2003-11-23 devnull 		}
297 7763a61a 2003-11-23 devnull 		for(j=0; j<pb; j++) {
298 7763a61a 2003-11-23 devnull 			entry = i*pb + j;
299 7763a61a 2003-11-23 devnull 			if(entry >= ne)
300 7763a61a 2003-11-23 devnull 				break;
301 7763a61a 2003-11-23 devnull 			parse(&ss, buf + j * VtEntrySize);
302 7763a61a 2003-11-23 devnull 
303 7763a61a 2003-11-23 devnull 			if(!find)
304 7763a61a 2003-11-23 devnull 				sourcePrint(&ss, indent, entry);
305 7763a61a 2003-11-23 devnull 			else if(memcmp(ss.score, fscore, VtScoreSize) == 0) {
306 7763a61a 2003-11-23 devnull 				dumpFileContents(&ss);
307 7763a61a 2003-11-23 devnull 				return 0;
308 7763a61a 2003-11-23 devnull 			}
309 7763a61a 2003-11-23 devnull 
310 7763a61a 2003-11-23 devnull 			if(ss.dir) {
311 7763a61a 2003-11-23 devnull 				if(!dumpDir(&ss, indent+1))
312 7763a61a 2003-11-23 devnull 					return 0;
313 7763a61a 2003-11-23 devnull 			} else if(all)
314 7763a61a 2003-11-23 devnull 				dumpFile(&ss, indent+1);
315 7763a61a 2003-11-23 devnull 		}
316 7763a61a 2003-11-23 devnull 	}
317 7763a61a 2003-11-23 devnull 	return 1;
318 7763a61a 2003-11-23 devnull }
319 7763a61a 2003-11-23 devnull 
320 7763a61a 2003-11-23 devnull void
321 7763a61a 2003-11-23 devnull usage(void)
322 7763a61a 2003-11-23 devnull {
323 7763a61a 2003-11-23 devnull 	fprint(2, "%s: [file]\n", argv0);
324 7763a61a 2003-11-23 devnull 	exits("usage");
325 7763a61a 2003-11-23 devnull }
326 7763a61a 2003-11-23 devnull 
327 7763a61a 2003-11-23 devnull int
328 7763a61a 2003-11-23 devnull parseScore(uchar *score, char *buf, int n)
329 7763a61a 2003-11-23 devnull {
330 7763a61a 2003-11-23 devnull 	int i, c;
331 7763a61a 2003-11-23 devnull 
332 7763a61a 2003-11-23 devnull 	memset(score, 0, VtScoreSize);
333 7763a61a 2003-11-23 devnull 
334 7763a61a 2003-11-23 devnull 	if(n < VtScoreSize*2)
335 7763a61a 2003-11-23 devnull 		return 0;
336 7763a61a 2003-11-23 devnull 	for(i=0; i<VtScoreSize*2; i++) {
337 7763a61a 2003-11-23 devnull 		if(buf[i] >= '0' && buf[i] <= '9')
338 7763a61a 2003-11-23 devnull 			c = buf[i] - '0';
339 7763a61a 2003-11-23 devnull 		else if(buf[i] >= 'a' && buf[i] <= 'f')
340 7763a61a 2003-11-23 devnull 			c = buf[i] - 'a' + 10;
341 7763a61a 2003-11-23 devnull 		else if(buf[i] >= 'A' && buf[i] <= 'F')
342 7763a61a 2003-11-23 devnull 			c = buf[i] - 'A' + 10;
343 7763a61a 2003-11-23 devnull 		else {
344 7763a61a 2003-11-23 devnull 			return 0;
345 7763a61a 2003-11-23 devnull 		}
346 7763a61a 2003-11-23 devnull 
347 7763a61a 2003-11-23 devnull 		if((i & 1) == 0)
348 7763a61a 2003-11-23 devnull 			c <<= 4;
349 7763a61a 2003-11-23 devnull 	
350 7763a61a 2003-11-23 devnull 		score[i>>1] |= c;
351 7763a61a 2003-11-23 devnull 	}
352 7763a61a 2003-11-23 devnull 	return 1;
353 7763a61a 2003-11-23 devnull }
354 7763a61a 2003-11-23 devnull 
355 7763a61a 2003-11-23 devnull void
356 7763a61a 2003-11-23 devnull readRoot(VtRoot *root, uchar *score, char *file)
357 7763a61a 2003-11-23 devnull {
358 7763a61a 2003-11-23 devnull 	int fd;
359 7763a61a 2003-11-23 devnull 	uchar buf[VtRootSize];
360 7763a61a 2003-11-23 devnull 	int i, n, nn;
361 7763a61a 2003-11-23 devnull 
362 7763a61a 2003-11-23 devnull 	if(file == 0)
363 7763a61a 2003-11-23 devnull 		fd = 0;
364 7763a61a 2003-11-23 devnull 	else {
365 7763a61a 2003-11-23 devnull 		fd = open(file, OREAD);
366 7763a61a 2003-11-23 devnull 		if(fd < 0)
367 7763a61a 2003-11-23 devnull 			sysfatal("could not open file: %s: %r\n", file);
368 7763a61a 2003-11-23 devnull 	}
369 7763a61a 2003-11-23 devnull 	n = readn(fd, buf, sizeof(buf)-1);
370 7763a61a 2003-11-23 devnull 	if(n < 0)
371 7763a61a 2003-11-23 devnull 		sysfatal("read failed: %r\n");
372 7763a61a 2003-11-23 devnull 	buf[n] = 0;
373 7763a61a 2003-11-23 devnull 	close(fd);
374 7763a61a 2003-11-23 devnull 
375 7763a61a 2003-11-23 devnull 	for(i=0; i<n; i++) {
376 7763a61a 2003-11-23 devnull 		if(!parseScore(score, (char*)(buf+i), n-i))
377 7763a61a 2003-11-23 devnull 			continue;
378 7763a61a 2003-11-23 devnull 		nn = vtRead(z, score, VtRootType, buf, VtRootSize);
379 7763a61a 2003-11-23 devnull 		if(nn >= 0) {
380 7763a61a 2003-11-23 devnull 			if(nn != VtRootSize)
381 7763a61a 2003-11-23 devnull 				sysfatal("vtRead on root too short");
382 7763a61a 2003-11-23 devnull 			if(!vtSha1Check(score, buf, VtRootSize))
383 7763a61a 2003-11-23 devnull 				sysfatal("vtSha1Check failed on root block");
384 7763a61a 2003-11-23 devnull 			if(!vtRootUnpack(root, buf))
385 7763a61a 2003-11-23 devnull 				sysfatal("could not parse root: %r");
386 7763a61a 2003-11-23 devnull 			return;
387 7763a61a 2003-11-23 devnull 		}
388 7763a61a 2003-11-23 devnull 	}
389 7763a61a 2003-11-23 devnull 
390 7763a61a 2003-11-23 devnull 	sysfatal("could not find root");
391 7763a61a 2003-11-23 devnull }