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Make "write_sha1_file()" exit early if the file already exists.

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Avoid the compression.
This commit is contained in:
Linus Torvalds 2005-04-20 09:28:05 -07:00
parent f18ca73166
commit 706bc531a1
1 changed files with 22 additions and 4 deletions
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26
sha1_file.c
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@ -173,12 +173,30 @@ int write_sha1_file(char *buf, unsigned len, unsigned char *returnsha1)
z_stream stream;
unsigned char sha1[20];
SHA_CTX c;
char *filename;
int fd;
/* Sha1.. */
SHA1_Init(&c);
SHA1_Update(&c, buf, len);
SHA1_Final(sha1, &c);
if (returnsha1)
memcpy(returnsha1, sha1, 20);
filename = sha1_file_name(sha1);
fd = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
if (fd < 0) {
if (errno != EEXIST)
return -1;
/*
* We might do collision checking here, but we'd need to
* uncompress the old file and check it. Later.
*/
return 0;
}
/* Set it up */
memset(&stream, 0, sizeof(stream));
deflateInit(&stream, Z_BEST_COMPRESSION);
@ -195,10 +213,10 @@ int write_sha1_file(char *buf, unsigned len, unsigned char *returnsha1)
deflateEnd(&stream);
size = stream.total_out;
if (write_sha1_buffer(sha1, compressed, size) < 0)
return -1;
if (returnsha1)
memcpy(returnsha1, sha1, 20);
if (write(fd, compressed, size) != size)
die("unable to write file");
close(fd);
return 0;
}