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.
17 #include <sys/queue.h>
27 #include "got_error.h"
28 #include "got_object.h"
31 #include "got_lib_deflate.h"
34 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
37 const struct got_error *
38 got_deflate_init(struct got_deflate_buf *zb, uint8_t *outbuf, size_t bufsize,
39 struct got_deflate_checksum *csum)
41 const struct got_error *err = NULL;
44 memset(&zb->z, 0, sizeof(zb->z));
46 zb->z.zalloc = Z_NULL;
48 zerr = deflateInit(&zb->z, Z_DEFAULT_COMPRESSION);
51 return got_error_from_errno("deflateInit");
52 if (zerr == Z_MEM_ERROR) {
54 return got_error_from_errno("deflateInit");
56 return got_error(GOT_ERR_COMPRESSION);
59 zb->inlen = zb->outlen = bufsize;
61 zb->inbuf = calloc(1, zb->inlen);
62 if (zb->inbuf == NULL) {
63 err = got_error_from_errno("calloc");
69 zb->outbuf = calloc(1, zb->outlen);
70 if (zb->outbuf == NULL) {
71 err = got_error_from_errno("calloc");
74 zb->flags |= GOT_DEFLATE_F_OWN_OUTBUF;
86 csum_output(struct got_deflate_checksum *csum, const char *buf, size_t len)
89 *csum->output_crc = crc32(*csum->output_crc, buf, len);
91 if (csum->output_sha1)
92 SHA1Update(csum->output_sha1, buf, len);
95 const struct got_error *
96 got_deflate_read(struct got_deflate_buf *zb, FILE *f, size_t *outlenp)
98 size_t last_total_out = zb->z.total_out;
102 z->next_out = zb->outbuf;
103 z->avail_out = zb->outlen;
107 char *csum_out = NULL;
108 size_t csum_avail = 0;
110 if (z->avail_in == 0) {
111 size_t n = fread(zb->inbuf, 1, zb->inlen, f);
114 return got_ferror(f, GOT_ERR_IO);
116 ret = deflate(z, Z_FINISH);
119 z->next_in = zb->inbuf;
123 csum_out = z->next_out;
124 csum_avail = z->avail_out;
126 ret = deflate(z, Z_NO_FLUSH);
128 csum_output(zb->csum, csum_out,
129 csum_avail - z->avail_out);
131 } while (ret == Z_OK && z->avail_out > 0);
134 zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
136 if (ret != Z_STREAM_END)
137 return got_error(GOT_ERR_COMPRESSION);
138 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
141 *outlenp = z->total_out - last_total_out;
146 got_deflate_end(struct got_deflate_buf *zb)
149 if (zb->flags & GOT_DEFLATE_F_OWN_OUTBUF)
154 const struct got_error *
155 got_deflate_to_file(size_t *outlen, FILE *infile, FILE *outfile,
156 struct got_deflate_checksum *csum)
158 const struct got_error *err;
160 struct got_deflate_buf zb;
162 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE, csum);
169 err = got_deflate_read(&zb, infile, &avail);
174 n = fwrite(zb.outbuf, avail, 1, outfile);
176 err = got_ferror(outfile, GOT_ERR_IO);
181 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
184 got_deflate_end(&zb);