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>
28 #include "got_error.h"
29 #include "got_object.h"
32 #include "got_lib_deflate.h"
33 #include "got_lib_hash.h"
34 #include "got_lib_poll.h"
37 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
40 const struct got_error *
41 got_deflate_init(struct got_deflate_buf *zb, uint8_t *outbuf, size_t bufsize)
43 const struct got_error *err = NULL;
46 memset(zb, 0, sizeof(*zb));
48 zb->z.zalloc = Z_NULL;
50 zerr = deflateInit(&zb->z, Z_DEFAULT_COMPRESSION);
53 return got_error_from_errno("deflateInit");
54 if (zerr == Z_MEM_ERROR) {
56 return got_error_from_errno("deflateInit");
58 return got_error(GOT_ERR_COMPRESSION);
61 zb->inlen = zb->outlen = bufsize;
63 zb->inbuf = calloc(1, zb->inlen);
64 if (zb->inbuf == NULL) {
65 err = got_error_from_errno("calloc");
71 zb->outbuf = calloc(1, zb->outlen);
72 if (zb->outbuf == NULL) {
73 err = got_error_from_errno("calloc");
76 zb->flags |= GOT_DEFLATE_F_OWN_OUTBUF;
86 csum_output(struct got_deflate_checksum *csum, const uint8_t *buf, size_t len)
89 *csum->output_crc = crc32(*csum->output_crc, buf, len);
92 got_hash_update(csum->output_ctx, buf, len);
95 const struct got_error *
96 got_deflate_read(struct got_deflate_buf *zb, FILE *f, off_t len,
97 size_t *outlenp, off_t *consumed)
99 size_t last_total_out = zb->z.total_out;
100 z_stream *z = &zb->z;
103 z->next_out = zb->outbuf;
104 z->avail_out = zb->outlen;
109 size_t last_total_in = z->total_in;
110 if (z->avail_in == 0) {
112 if (*consumed < len) {
113 n = fread(zb->inbuf, 1,
114 MIN(zb->inlen, len - *consumed), f);
118 return got_ferror(f, GOT_ERR_IO);
120 ret = deflate(z, Z_FINISH);
123 z->next_in = zb->inbuf;
126 ret = deflate(z, Z_NO_FLUSH);
127 *consumed += z->total_in - last_total_in;
128 } while (ret == Z_OK && z->avail_out > 0);
131 zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
133 if (ret != Z_STREAM_END)
134 return got_error(GOT_ERR_COMPRESSION);
135 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
138 *outlenp = z->total_out - last_total_out;
142 static const struct got_error *
143 deflate_read_mmap(struct got_deflate_buf *zb, uint8_t *map, size_t offset,
144 size_t len, size_t *outlenp, size_t *consumed, int flush_on_eof)
146 z_stream *z = &zb->z;
147 size_t last_total_out = z->total_out;
150 z->next_out = zb->outbuf;
151 z->avail_out = zb->outlen;
156 size_t last_total_in = z->total_in;
157 if (z->avail_in == 0) {
158 z->next_in = map + offset + *consumed;
159 if (len - *consumed > UINT_MAX)
160 z->avail_in = UINT_MAX;
162 z->avail_in = len - *consumed;
163 if (z->avail_in == 0) {
166 ret = deflate(z, Z_FINISH);
170 ret = deflate(z, Z_NO_FLUSH);
171 *consumed += z->total_in - last_total_in;
172 } while (ret == Z_OK && z->avail_out > 0);
175 zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
177 if (ret != Z_STREAM_END)
178 return got_error(GOT_ERR_COMPRESSION);
179 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
182 *outlenp = z->total_out - last_total_out;
186 const struct got_error *
187 got_deflate_read_mmap(struct got_deflate_buf *zb, uint8_t *map, size_t offset,
188 size_t len, size_t *outlenp, size_t *consumed)
190 return deflate_read_mmap(zb, map, offset, len, outlenp, consumed, 1);
193 const struct got_error *
194 got_deflate_flush(struct got_deflate_buf *zb, FILE *outfile,
195 struct got_deflate_checksum *csum, off_t *outlenp)
199 z_stream *z = &zb->z;
201 if (z->avail_in != 0)
202 return got_error_msg(GOT_ERR_COMPRESSION,
203 "cannot flush zb with pending input data");
206 size_t avail, last_total_out = zb->z.total_out;
208 z->next_out = zb->outbuf;
209 z->avail_out = zb->outlen;
211 ret = deflate(z, Z_FINISH);
212 if (ret != Z_STREAM_END && ret != Z_OK)
213 return got_error(GOT_ERR_COMPRESSION);
215 avail = z->total_out - last_total_out;
217 n = fwrite(zb->outbuf, avail, 1, outfile);
219 return got_ferror(outfile, GOT_ERR_IO);
221 csum_output(csum, zb->outbuf, avail);
225 } while (ret != Z_STREAM_END);
227 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
232 got_deflate_end(struct got_deflate_buf *zb)
235 if (zb->flags & GOT_DEFLATE_F_OWN_OUTBUF)
240 const struct got_error *
241 got_deflate_to_fd(off_t *outlen, FILE *infile, off_t len, int outfd,
242 struct got_deflate_checksum *csum)
244 const struct got_error *err;
247 struct got_deflate_buf zb;
249 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
256 err = got_deflate_read(&zb, infile, len, &avail, &consumed);
261 err = got_poll_write_full(outfd, zb.outbuf, avail);
265 csum_output(csum, zb.outbuf, avail);
268 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
271 got_deflate_end(&zb);
275 const struct got_error *
276 got_deflate_to_fd_mmap(off_t *outlen, uint8_t *map, size_t offset,
277 size_t len, int outfd, struct got_deflate_checksum *csum)
279 const struct got_error *err;
280 size_t avail, consumed;
281 struct got_deflate_buf zb;
283 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
289 err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
296 err = got_poll_write_full(outfd, zb.outbuf, avail);
300 csum_output(csum, zb.outbuf, avail);
303 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
306 got_deflate_end(&zb);
310 const struct got_error *
311 got_deflate_to_file(off_t *outlen, FILE *infile, off_t len,
312 FILE *outfile, struct got_deflate_checksum *csum)
314 const struct got_error *err;
317 struct got_deflate_buf zb;
319 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
326 err = got_deflate_read(&zb, infile, len, &avail, &consumed);
332 n = fwrite(zb.outbuf, avail, 1, outfile);
334 err = got_ferror(outfile, GOT_ERR_IO);
338 csum_output(csum, zb.outbuf, avail);
341 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
344 got_deflate_end(&zb);
348 const struct got_error *
349 got_deflate_to_file_mmap(off_t *outlen, uint8_t *map, size_t offset,
350 size_t len, FILE *outfile, struct got_deflate_checksum *csum)
352 const struct got_error *err;
353 size_t avail, consumed;
354 struct got_deflate_buf zb;
356 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
362 err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
370 n = fwrite(zb.outbuf, avail, 1, outfile);
372 err = got_ferror(outfile, GOT_ERR_IO);
376 csum_output(csum, zb.outbuf, avail);
379 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
382 got_deflate_end(&zb);
386 const struct got_error *
387 got_deflate_append_to_file_mmap(struct got_deflate_buf *zb, off_t *outlen,
388 uint8_t *map, size_t offset, size_t len, FILE *outfile,
389 struct got_deflate_checksum *csum)
391 const struct got_error *err;
392 size_t avail, consumed;
395 err = deflate_read_mmap(zb, map, offset, len, &avail,
403 n = fwrite(zb->outbuf, avail, 1, outfile);
405 err = got_ferror(outfile, GOT_ERR_IO);
409 csum_output(csum, zb->outbuf, avail);
413 } while ((zb->flags & GOT_DEFLATE_F_HAVE_MORE) && len > 0);
418 const struct got_error *
419 got_deflate_to_mem_mmap(uint8_t **outbuf, size_t *outlen,
420 size_t *consumed_total, struct got_deflate_checksum *csum, uint8_t *map,
421 size_t offset, size_t len)
423 const struct got_error *err;
424 size_t avail, consumed;
425 struct got_deflate_buf zb;
430 *outbuf = malloc(GOT_DEFLATE_BUFSIZE);
432 return got_error_from_errno("malloc");
433 err = got_deflate_init(&zb, *outbuf, GOT_DEFLATE_BUFSIZE);
440 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
449 err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
455 *consumed_total += consumed;
457 if (avail > 0 && csum)
458 csum_output(csum, zb.outbuf, avail);
460 if ((zb.flags & GOT_DEFLATE_F_HAVE_MORE) && outbuf != NULL) {
461 newbuf = reallocarray(*outbuf, ++nbuf,
462 GOT_DEFLATE_BUFSIZE);
463 if (newbuf == NULL) {
464 err = got_error_from_errno("reallocarray");
471 zb.outbuf = newbuf + *outlen;
472 zb.outlen = (nbuf * GOT_DEFLATE_BUFSIZE) - *outlen;
474 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
476 got_deflate_end(&zb);