Convert the index file reading/writing to use network byte order.
[git/git.git] / write-tree.c
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8bc9a0c7
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1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
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6#include "cache.h"
7
8static int check_valid_sha1(unsigned char *sha1)
9{
10 char *filename = sha1_file_name(sha1);
11 int ret;
12
13 /* If we were anal, we'd check that the sha1 of the contents actually matches */
14 ret = access(filename, R_OK);
15 if (ret)
16 perror(filename);
17 return ret;
18}
19
20static int prepend_integer(char *buffer, unsigned val, int i)
21{
22 buffer[--i] = '\0';
23 do {
24 buffer[--i] = '0' + (val % 10);
25 val /= 10;
26 } while (val);
27 return i;
28}
29
30#define ORIG_OFFSET (40) /* Enough space to add the header of "tree <size>\0" */
31
d6d3f9d0 32static int write_tree(struct cache_entry **cachep, int maxentries, const char *base, int baselen, unsigned char *returnsha1)
e83c5163 33{
d6d3f9d0 34 unsigned char subdir_sha1[20];
19b2860c 35 unsigned long size, offset;
e83c5163 36 char *buffer;
d6d3f9d0 37 int i, nr;
e83c5163 38
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39 /* Guess at some random initial size */
40 size = 8192;
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41 buffer = malloc(size);
42 offset = ORIG_OFFSET;
43
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44 nr = 0;
45 do {
46 struct cache_entry *ce = cachep[nr];
47 const char *pathname = ce->name, *filename, *dirname;
ccc4feb5 48 int pathlen = ce_namelen(ce), entrylen;
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49 unsigned char *sha1;
50 unsigned int mode;
51
52 /* Did we hit the end of the directory? Return how many we wrote */
53 if (baselen >= pathlen || memcmp(base, pathname, baselen))
54 break;
55
56 sha1 = ce->sha1;
ccc4feb5 57 mode = ntohl(ce->ce_mode);
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58
59 /* Do we have _further_ subdirectories? */
60 filename = pathname + baselen;
61 dirname = strchr(filename, '/');
62 if (dirname) {
63 int subdir_written;
64
65 subdir_written = write_tree(cachep + nr, maxentries - nr, pathname, dirname-pathname+1, subdir_sha1);
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66 nr += subdir_written;
67
68 /* Now we need to write out the directory entry into this tree.. */
69 mode = S_IFDIR;
70 pathlen = dirname - pathname;
71
72 /* ..but the directory entry doesn't count towards the total count */
73 nr--;
74 sha1 = subdir_sha1;
75 }
76
77 if (check_valid_sha1(sha1) < 0)
e83c5163 78 exit(1);
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79
80 entrylen = pathlen - baselen;
81 if (offset + entrylen + 100 > size) {
82 size = alloc_nr(offset + entrylen + 100);
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83 buffer = realloc(buffer, size);
84 }
d6d3f9d0 85 offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
e83c5163 86 buffer[offset++] = 0;
d6d3f9d0 87 memcpy(buffer + offset, sha1, 20);
e83c5163 88 offset += 20;
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89 nr++;
90 } while (nr < maxentries);
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91
92 i = prepend_integer(buffer, offset - ORIG_OFFSET, ORIG_OFFSET);
93 i -= 5;
94 memcpy(buffer+i, "tree ", 5);
95
96 buffer += i;
97 offset -= i;
98
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99 write_sha1_file(buffer, offset, returnsha1);
100 return nr;
101}
102
103int main(int argc, char **argv)
104{
105 int entries = read_cache();
106 unsigned char sha1[20];
107
108 if (entries <= 0)
2de381f9 109 die("write-tree: no cache contents to write");
d6d3f9d0 110 if (write_tree(active_cache, entries, "", 0, sha1) != entries)
2de381f9 111 die("write-tree: internal error");
d6d3f9d0 112 printf("%s\n", sha1_to_hex(sha1));
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113 return 0;
114}