archive.c: make archiver static
[git/git.git] / csum-file.c
CommitLineData
c38138cd
LT
1/*
2 * csum-file.c
3 *
4 * Copyright (C) 2005 Linus Torvalds
5 *
6 * Simple file write infrastructure for writing SHA1-summed
7 * files. Useful when you write a file that you want to be
8 * able to verify hasn't been messed with afterwards.
9 */
10#include "cache.h"
2a128d63 11#include "progress.h"
c38138cd
LT
12#include "csum-file.h"
13
a8032d12 14static void sha1flush(struct sha1file *f, void *buf, unsigned int count)
c38138cd 15{
c38138cd 16 for (;;) {
1c15afb9 17 int ret = xwrite(f->fd, buf, count);
c38138cd 18 if (ret > 0) {
218558af
NP
19 f->total += ret;
20 display_throughput(f->tp, f->total);
1d7f171c 21 buf = (char *) buf + ret;
c38138cd
LT
22 count -= ret;
23 if (count)
24 continue;
78b713a1 25 return;
c38138cd
LT
26 }
27 if (!ret)
e1808845 28 die("sha1 file '%s' write error. Out of diskspace", f->name);
e1808845 29 die("sha1 file '%s' write error (%s)", f->name, strerror(errno));
c38138cd
LT
30 }
31}
32
4c81b03e 33int sha1close(struct sha1file *f, unsigned char *result, unsigned int flags)
c38138cd 34{
7ba502c4 35 int fd;
c38138cd 36 unsigned offset = f->offset;
4c81b03e 37
c38138cd
LT
38 if (offset) {
39 SHA1_Update(&f->ctx, f->buffer, offset);
a8032d12 40 sha1flush(f, f->buffer, offset);
f0215369 41 f->offset = 0;
c38138cd 42 }
ac0463ed
NP
43 SHA1_Final(f->buffer, &f->ctx);
44 if (result)
45 hashcpy(result, f->buffer);
4c81b03e 46 if (flags & (CSUM_CLOSE | CSUM_FSYNC)) {
7ba502c4 47 /* write checksum and close fd */
a8032d12 48 sha1flush(f, f->buffer, 20);
4c81b03e
LT
49 if (flags & CSUM_FSYNC)
50 fsync_or_die(f->fd, f->name);
7ba502c4
NP
51 if (close(f->fd))
52 die("%s: sha1 file error on close (%s)",
53 f->name, strerror(errno));
54 fd = 0;
55 } else
56 fd = f->fd;
7bf058f0 57 free(f);
7ba502c4 58 return fd;
c38138cd
LT
59}
60
61int sha1write(struct sha1file *f, void *buf, unsigned int count)
62{
63 while (count) {
64 unsigned offset = f->offset;
65 unsigned left = sizeof(f->buffer) - offset;
66 unsigned nr = count > left ? left : count;
a8032d12
NP
67 void *data;
68
69 if (f->do_crc)
70 f->crc32 = crc32(f->crc32, buf, nr);
71
72 if (nr == sizeof(f->buffer)) {
73 /* process full buffer directly without copy */
74 data = buf;
75 } else {
76 memcpy(f->buffer + offset, buf, nr);
77 data = f->buffer;
78 }
c38138cd 79
c38138cd
LT
80 count -= nr;
81 offset += nr;
1d7f171c 82 buf = (char *) buf + nr;
c38138cd
LT
83 left -= nr;
84 if (!left) {
a8032d12
NP
85 SHA1_Update(&f->ctx, data, offset);
86 sha1flush(f, data, offset);
c38138cd
LT
87 offset = 0;
88 }
89 f->offset = offset;
90 }
91 return 0;
92}
93
4397f014 94struct sha1file *sha1fd(int fd, const char *name)
2a128d63
NP
95{
96 return sha1fd_throughput(fd, name, NULL);
97}
98
99struct sha1file *sha1fd_throughput(int fd, const char *name, struct progress *tp)
4397f014 100{
ec640ed1 101 struct sha1file *f = xmalloc(sizeof(*f));
4397f014 102 f->fd = fd;
4397f014 103 f->offset = 0;
218558af 104 f->total = 0;
2a128d63 105 f->tp = tp;
ec640ed1 106 f->name = name;
78d1e84f 107 f->do_crc = 0;
4397f014
LT
108 SHA1_Init(&f->ctx);
109 return f;
110}
111
78d1e84f
NP
112void crc32_begin(struct sha1file *f)
113{
114 f->crc32 = crc32(0, Z_NULL, 0);
115 f->do_crc = 1;
116}
c38138cd 117
78d1e84f
NP
118uint32_t crc32_end(struct sha1file *f)
119{
120 f->do_crc = 0;
121 return f->crc32;
122}