1 /*
2  * Copyright (c) 2019 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 struct got_deflate_checksum {
18 	/* If not NULL, mix output bytes into this CRC checksum. */
19 	uint32_t *output_crc;
20 
21 	/* If not NULL, mix output bytes into this hash context. */
22 	struct got_hash *output_ctx;
23 };
24 
25 struct got_deflate_buf {
26 	z_stream z;
27 	uint8_t *inbuf;
28 	size_t inlen;
29 	uint8_t *outbuf;
30 	size_t outlen;
31 	int flags;
32 #define GOT_DEFLATE_F_HAVE_MORE		0x01
33 #define GOT_DEFLATE_F_OWN_OUTBUF	0x02
34 };
35 
36 #define GOT_DEFLATE_BUFSIZE		8192
37 
38 const struct got_error *got_deflate_init(struct got_deflate_buf *, uint8_t *,
39     size_t);
40 const struct got_error *got_deflate_read(struct got_deflate_buf *, FILE *,
41     off_t, size_t *, off_t *);
42 const struct got_error *got_deflate_read_mmap(struct got_deflate_buf *,
43     uint8_t *, size_t, size_t, size_t *, size_t *);
44 void got_deflate_end(struct got_deflate_buf *);
45 const struct got_error *got_deflate_to_fd(off_t *, FILE *, off_t, int,
46     struct got_deflate_checksum *);
47 const struct got_error *got_deflate_to_fd_mmap(off_t *, uint8_t *,
48     size_t, size_t, int, struct got_deflate_checksum *);
49 const struct got_error *got_deflate_to_file(off_t *, FILE *, off_t, FILE *,
50     struct got_deflate_checksum *);
51 const struct got_error *got_deflate_to_file_mmap(off_t *, uint8_t *,
52     size_t, size_t, FILE *, struct got_deflate_checksum *);
53 const struct got_error *got_deflate_flush(struct got_deflate_buf *, FILE *,
54     struct got_deflate_checksum *, off_t *);
55 const struct got_error *got_deflate_append_to_file_mmap(
56     struct got_deflate_buf *, off_t *, uint8_t *, size_t, size_t, FILE *,
57     struct got_deflate_checksum *);
58 const struct got_error *got_deflate_to_mem_mmap(uint8_t **, size_t *, size_t *,
59     struct got_deflate_checksum *, uint8_t *, size_t, size_t);