FreeCalypso > hg > freecalypso-tools

comparison target-utils/libtiffs/findfile.c @ 0:e7502631a0f9

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
initial import from freecalypso-sw rev 1033:5ab737ac3ad7
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Jun 2016 00:13:35 +0000
parents
children 87cb03b35f77
comparison
equal deleted inserted replaced
-1:000000000000 0:e7502631a0f9
1 #include <sys/types.h>
2 #include "types.h"
3 #include "struct.h"
4 #include "globals.h"
5 #include "macros.h"
6
7 static u8 *
8 find_endofchunk(ino)
9 {
10 struct inode *irec = mpffs_active_index + ino;
11 u8 *p;
12 int i;
13
14 p = inode_to_dataptr(irec) + irec->len;
15 for (i = 0; i < 16; i++) {
16 p--;
17 if (!*p)
18 return(p);
19 if (*p != 0xFF)
20 break;
21 }
22 printf("Error: inode #%x has no valid termination\n", ino);
23 return(p); /* XXX */
24 }
25
26 mpffs_find_file(pathname, startret, sizeret, continue_ret)
27 char *pathname;
28 u8 **startret;
29 size_t *sizeret;
30 int *continue_ret;
31 {
32 int ino, cont;
33 struct inode *irec;
34 u8 *start, *end;
35 int size;
36
37 ino = mpffs_pathname_to_inode(pathname);
38 if (ino <= 0)
39 return(-1);
40 irec = mpffs_active_index + ino;
41 if (irec->type != OBJTYPE_FILE) {
42 printf("Error: %s is not a regular file\n", pathname);
43 return(-1);
44 }
45 start = inode_to_dataptr(irec);
46 start += strlen(start) + 1;
47 end = find_endofchunk(ino);
48 size = end - start;
49 if (size < 0)
50 size = 0;
51 cont = irec->descend;
52 if (cont == 0xFFFF)
53 cont = 0;
54 if (startret)
55 *startret = start;
56 if (sizeret)
57 *sizeret = size;
58 if (continue_ret)
59 *continue_ret = cont;
60 return(0);
61 }
62
63 mpffs_get_segment(ino, startret, sizeret, continue_ret)
64 int ino;
65 u8 **startret;
66 size_t *sizeret;
67 int *continue_ret;
68 {
69 int cont;
70 struct inode *irec;
71 u8 *start, *end;
72 int size;
73
74 for (;;) {
75 irec = mpffs_active_index + ino;
76 if (irec->type)
77 break;
78 if (irec->sibling == 0xFFFF) {
79 printf("Error: segment inode #%d: deleted and no sibling\n",
80 ino);
81 return(-1);
82 }
83 ino = irec->sibling;
84 }
85 if (irec->type != OBJTYPE_SEGMENT) {
86 printf("Error: inode #%x is not a segment\n", ino);
87 return(-1);
88 }
89 start = inode_to_dataptr(irec);
90 end = find_endofchunk(ino);
91 size = end - start;
92 if (size <= 0) {
93 printf("Error: segment inode #%x: bad length\n", ino);
94 return(-1);
95 }
96 cont = irec->descend;
97 if (cont == 0xFFFF)
98 cont = 0;
99 if (startret)
100 *startret = start;
101 if (sizeret)
102 *sizeret = size;
103 if (continue_ret)
104 *continue_ret = cont;
105 return(0);
106 }