2 * Copyright (c) 2019 Stefan Sperling <stsp@openbsd.org>
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.
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.
25 #include "got_error.h"
26 #include "got_object.h"
29 #include "got_lib_deflate.h"
32 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
35 const struct got_error *
36 got_deflate_init(struct got_deflate_buf *zb, uint8_t *outbuf, size_t bufsize)
38 const struct got_error *err = NULL;
41 memset(&zb->z, 0, sizeof(zb->z));
43 zb->z.zalloc = Z_NULL;
45 zerr = deflateInit(&zb->z, Z_DEFAULT_COMPRESSION);
48 return got_error_from_errno("deflateInit");
49 if (zerr == Z_MEM_ERROR) {
51 return got_error_from_errno("deflateInit");
53 return got_error(GOT_ERR_COMPRESSION);
56 zb->inlen = zb->outlen = bufsize;
58 zb->inbuf = calloc(1, zb->inlen);
59 if (zb->inbuf == NULL) {
60 err = got_error_from_errno("calloc");
66 zb->outbuf = calloc(1, zb->outlen);
67 if (zb->outbuf == NULL) {
68 err = got_error_from_errno("calloc");
71 zb->flags |= GOT_DEFLATE_F_OWN_OUTBUF;
81 csum_output(struct got_deflate_checksum *csum, const uint8_t *buf, size_t len)
84 *csum->output_crc = crc32(*csum->output_crc, buf, len);
86 if (csum->output_sha1)
87 SHA1Update(csum->output_sha1, buf, len);
90 const struct got_error *
91 got_deflate_read(struct got_deflate_buf *zb, FILE *f, size_t *outlenp)
93 size_t last_total_out = zb->z.total_out;
97 z->next_out = zb->outbuf;
98 z->avail_out = zb->outlen;
102 if (z->avail_in == 0) {
103 size_t n = fread(zb->inbuf, 1, zb->inlen, f);
106 return got_ferror(f, GOT_ERR_IO);
108 ret = deflate(z, Z_FINISH);
111 z->next_in = zb->inbuf;
114 ret = deflate(z, Z_NO_FLUSH);
115 } while (ret == Z_OK && z->avail_out > 0);
118 zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
120 if (ret != Z_STREAM_END)
121 return got_error(GOT_ERR_COMPRESSION);
122 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
125 *outlenp = z->total_out - last_total_out;
130 got_deflate_end(struct got_deflate_buf *zb)
133 if (zb->flags & GOT_DEFLATE_F_OWN_OUTBUF)
138 const struct got_error *
139 got_deflate_to_file(size_t *outlen, FILE *infile, FILE *outfile,
140 struct got_deflate_checksum *csum)
142 const struct got_error *err;
144 struct got_deflate_buf zb;
146 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
153 err = got_deflate_read(&zb, infile, &avail);
158 n = fwrite(zb.outbuf, avail, 1, outfile);
160 err = got_ferror(outfile, GOT_ERR_IO);
164 csum_output(csum, zb.outbuf, avail);
167 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
170 got_deflate_end(&zb);