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>
26 #include "got_error.h"
27 #include "got_object.h"
30 #include "got_lib_deflate.h"
33 #define MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
36 const struct got_error *
37 got_deflate_init(struct got_deflate_buf *zb, uint8_t *outbuf, size_t bufsize)
39 const struct got_error *err = NULL;
42 memset(&zb->z, 0, sizeof(zb->z));
44 zb->z.zalloc = Z_NULL;
46 zerr = deflateInit(&zb->z, Z_DEFAULT_COMPRESSION);
49 return got_error_from_errno("deflateInit");
50 if (zerr == Z_MEM_ERROR) {
52 return got_error_from_errno("deflateInit");
54 return got_error(GOT_ERR_COMPRESSION);
57 zb->inlen = zb->outlen = bufsize;
59 zb->inbuf = calloc(1, zb->inlen);
60 if (zb->inbuf == NULL) {
61 err = got_error_from_errno("calloc");
67 zb->outbuf = calloc(1, zb->outlen);
68 if (zb->outbuf == NULL) {
69 err = got_error_from_errno("calloc");
72 zb->flags |= GOT_DEFLATE_F_OWN_OUTBUF;
82 csum_output(struct got_deflate_checksum *csum, const uint8_t *buf, size_t len)
85 *csum->output_crc = crc32(*csum->output_crc, buf, len);
87 if (csum->output_sha1)
88 SHA1Update(csum->output_sha1, buf, len);
91 const struct got_error *
92 got_deflate_read(struct got_deflate_buf *zb, FILE *f, off_t len,
93 size_t *outlenp, off_t *consumed)
95 size_t last_total_out = zb->z.total_out;
99 z->next_out = zb->outbuf;
100 z->avail_out = zb->outlen;
105 size_t last_total_in = z->total_in;
106 if (z->avail_in == 0) {
108 if (*consumed < len) {
109 n = fread(zb->inbuf, 1,
110 MIN(zb->inlen, len - *consumed), f);
114 return got_ferror(f, GOT_ERR_IO);
116 ret = deflate(z, Z_FINISH);
119 z->next_in = zb->inbuf;
122 ret = deflate(z, Z_NO_FLUSH);
123 *consumed += z->total_in - last_total_in;
124 } while (ret == Z_OK && z->avail_out > 0);
127 zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
129 if (ret != Z_STREAM_END)
130 return got_error(GOT_ERR_COMPRESSION);
131 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
134 *outlenp = z->total_out - last_total_out;
138 static const struct got_error *
139 deflate_read_mmap(struct got_deflate_buf *zb, uint8_t *map, size_t offset,
140 size_t len, size_t *outlenp, size_t *consumed, int flush_on_eof)
142 z_stream *z = &zb->z;
143 size_t last_total_out = z->total_out;
146 z->next_out = zb->outbuf;
147 z->avail_out = zb->outlen;
152 size_t last_total_in = z->total_in;
153 if (z->avail_in == 0) {
154 z->next_in = map + offset + *consumed;
155 if (len - *consumed > UINT_MAX)
156 z->avail_in = UINT_MAX;
158 z->avail_in = len - *consumed;
159 if (z->avail_in == 0) {
162 ret = deflate(z, Z_FINISH);
166 ret = deflate(z, Z_NO_FLUSH);
167 *consumed += z->total_in - last_total_in;
168 } while (ret == Z_OK && z->avail_out > 0);
171 zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
173 if (ret != Z_STREAM_END)
174 return got_error(GOT_ERR_COMPRESSION);
175 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
178 *outlenp = z->total_out - last_total_out;
182 const struct got_error *
183 got_deflate_read_mmap(struct got_deflate_buf *zb, uint8_t *map, size_t offset,
184 size_t len, size_t *outlenp, size_t *consumed)
186 return deflate_read_mmap(zb, map, offset, len, outlenp, consumed, 1);
189 const struct got_error *
190 got_deflate_flush(struct got_deflate_buf *zb, FILE *outfile,
191 struct got_deflate_checksum *csum, off_t *outlenp)
195 z_stream *z = &zb->z;
197 if (z->avail_in != 0)
198 return got_error_msg(GOT_ERR_COMPRESSION,
199 "cannot flush zb with pending input data");
202 size_t avail, last_total_out = zb->z.total_out;
204 z->next_out = zb->outbuf;
205 z->avail_out = zb->outlen;
207 ret = deflate(z, Z_FINISH);
208 if (ret != Z_STREAM_END && ret != Z_OK)
209 return got_error(GOT_ERR_COMPRESSION);
211 avail = z->total_out - last_total_out;
213 n = fwrite(zb->outbuf, avail, 1, outfile);
215 return got_ferror(outfile, GOT_ERR_IO);
217 csum_output(csum, zb->outbuf, avail);
221 } while (ret != Z_STREAM_END);
223 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
228 got_deflate_end(struct got_deflate_buf *zb)
231 if (zb->flags & GOT_DEFLATE_F_OWN_OUTBUF)
236 const struct got_error *
237 got_deflate_to_file(off_t *outlen, FILE *infile, off_t len,
238 FILE *outfile, struct got_deflate_checksum *csum)
240 const struct got_error *err;
243 struct got_deflate_buf zb;
245 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
252 err = got_deflate_read(&zb, infile, len, &avail, &consumed);
258 n = fwrite(zb.outbuf, avail, 1, outfile);
260 err = got_ferror(outfile, GOT_ERR_IO);
264 csum_output(csum, zb.outbuf, avail);
267 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
270 got_deflate_end(&zb);
274 const struct got_error *
275 got_deflate_to_file_mmap(off_t *outlen, uint8_t *map, size_t offset,
276 size_t len, FILE *outfile, struct got_deflate_checksum *csum)
278 const struct got_error *err;
279 size_t avail, consumed;
280 struct got_deflate_buf zb;
282 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
288 err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
296 n = fwrite(zb.outbuf, avail, 1, outfile);
298 err = got_ferror(outfile, GOT_ERR_IO);
302 csum_output(csum, zb.outbuf, avail);
305 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
308 got_deflate_end(&zb);
312 const struct got_error *
313 got_deflate_append_to_file_mmap(struct got_deflate_buf *zb, off_t *outlen,
314 uint8_t *map, size_t offset, size_t len, FILE *outfile,
315 struct got_deflate_checksum *csum)
317 const struct got_error *err;
318 size_t avail, consumed;
321 err = deflate_read_mmap(zb, map, offset, len, &avail,
329 n = fwrite(zb->outbuf, avail, 1, outfile);
331 err = got_ferror(outfile, GOT_ERR_IO);
335 csum_output(csum, zb->outbuf, avail);
339 } while ((zb->flags & GOT_DEFLATE_F_HAVE_MORE) && len > 0);
344 const struct got_error *
345 got_deflate_to_mem_mmap(uint8_t **outbuf, size_t *outlen,
346 size_t *consumed_total, struct got_deflate_checksum *csum, uint8_t *map,
347 size_t offset, size_t len)
349 const struct got_error *err;
350 size_t avail, consumed;
351 struct got_deflate_buf zb;
356 *outbuf = malloc(GOT_DEFLATE_BUFSIZE);
358 return got_error_from_errno("malloc");
359 err = got_deflate_init(&zb, *outbuf, GOT_DEFLATE_BUFSIZE);
366 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
375 err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
381 *consumed_total += consumed;
383 if (avail > 0 && csum)
384 csum_output(csum, zb.outbuf, avail);
386 if ((zb.flags & GOT_DEFLATE_F_HAVE_MORE) && outbuf != NULL) {
387 newbuf = reallocarray(*outbuf, ++nbuf,
388 GOT_DEFLATE_BUFSIZE);
389 if (newbuf == NULL) {
390 err = got_error_from_errno("reallocarray");
397 zb.outbuf = newbuf + *outlen;
398 zb.outlen = (nbuf * GOT_DEFLATE_BUFSIZE) - *outlen;
400 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
402 got_deflate_end(&zb);