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, off_t len,
92 size_t *outlenp, off_t *consumed)
94 size_t last_total_out = zb->z.total_out;
98 z->next_out = zb->outbuf;
99 z->avail_out = zb->outlen;
104 size_t last_total_in = z->total_in;
105 if (z->avail_in == 0) {
107 if (*consumed < len) {
108 n = fread(zb->inbuf, 1,
109 MIN(zb->inlen, len - *consumed), f);
113 return got_ferror(f, GOT_ERR_IO);
115 ret = deflate(z, Z_FINISH);
118 z->next_in = zb->inbuf;
121 ret = deflate(z, Z_NO_FLUSH);
122 *consumed += z->total_in - last_total_in;
123 } while (ret == Z_OK && z->avail_out > 0);
126 zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
128 if (ret != Z_STREAM_END)
129 return got_error(GOT_ERR_COMPRESSION);
130 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
133 *outlenp = z->total_out - last_total_out;
137 static const struct got_error *
138 deflate_read_mmap(struct got_deflate_buf *zb, uint8_t *map, size_t offset,
139 size_t len, size_t *outlenp, size_t *consumed, int flush_on_eof)
141 z_stream *z = &zb->z;
142 size_t last_total_out = z->total_out;
145 z->next_out = zb->outbuf;
146 z->avail_out = zb->outlen;
151 size_t last_total_in = z->total_in;
152 if (z->avail_in == 0) {
153 z->next_in = map + offset + *consumed;
154 if (len - *consumed > UINT_MAX)
155 z->avail_in = UINT_MAX;
157 z->avail_in = len - *consumed;
158 if (z->avail_in == 0) {
161 ret = deflate(z, Z_FINISH);
165 ret = deflate(z, Z_NO_FLUSH);
166 *consumed += z->total_in - last_total_in;
167 } while (ret == Z_OK && z->avail_out > 0);
170 zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
172 if (ret != Z_STREAM_END)
173 return got_error(GOT_ERR_COMPRESSION);
174 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
177 *outlenp = z->total_out - last_total_out;
181 const struct got_error *
182 got_deflate_read_mmap(struct got_deflate_buf *zb, uint8_t *map, size_t offset,
183 size_t len, size_t *outlenp, size_t *consumed)
185 return deflate_read_mmap(zb, map, offset, len, outlenp, consumed, 1);
188 const struct got_error *
189 got_deflate_flush(struct got_deflate_buf *zb, FILE *outfile,
190 struct got_deflate_checksum *csum, off_t *outlenp)
194 z_stream *z = &zb->z;
196 if (z->avail_in != 0)
197 return got_error_msg(GOT_ERR_COMPRESSION,
198 "cannot flush zb with pending input data");
201 size_t avail, last_total_out = zb->z.total_out;
203 z->next_out = zb->outbuf;
204 z->avail_out = zb->outlen;
206 ret = deflate(z, Z_FINISH);
207 if (ret != Z_STREAM_END && ret != Z_OK)
208 return got_error(GOT_ERR_COMPRESSION);
210 avail = z->total_out - last_total_out;
212 n = fwrite(zb->outbuf, avail, 1, outfile);
214 return got_ferror(outfile, GOT_ERR_IO);
216 csum_output(csum, zb->outbuf, avail);
220 } while (ret != Z_STREAM_END);
222 zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
227 got_deflate_end(struct got_deflate_buf *zb)
230 if (zb->flags & GOT_DEFLATE_F_OWN_OUTBUF)
235 const struct got_error *
236 got_deflate_to_file(off_t *outlen, FILE *infile, off_t len,
237 FILE *outfile, struct got_deflate_checksum *csum)
239 const struct got_error *err;
242 struct got_deflate_buf zb;
244 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
251 err = got_deflate_read(&zb, infile, len, &avail, &consumed);
257 n = fwrite(zb.outbuf, avail, 1, outfile);
259 err = got_ferror(outfile, GOT_ERR_IO);
263 csum_output(csum, zb.outbuf, avail);
266 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
269 got_deflate_end(&zb);
273 const struct got_error *
274 got_deflate_to_file_mmap(off_t *outlen, uint8_t *map, size_t offset,
275 size_t len, FILE *outfile, struct got_deflate_checksum *csum)
277 const struct got_error *err;
278 size_t avail, consumed;
279 struct got_deflate_buf zb;
281 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
287 err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
295 n = fwrite(zb.outbuf, avail, 1, outfile);
297 err = got_ferror(outfile, GOT_ERR_IO);
301 csum_output(csum, zb.outbuf, avail);
304 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
307 got_deflate_end(&zb);
311 const struct got_error *
312 got_deflate_append_to_file_mmap(struct got_deflate_buf *zb, off_t *outlen,
313 uint8_t *map, size_t offset, size_t len, FILE *outfile,
314 struct got_deflate_checksum *csum)
316 const struct got_error *err;
317 size_t avail, consumed;
320 err = deflate_read_mmap(zb, map, offset, len, &avail,
328 n = fwrite(zb->outbuf, avail, 1, outfile);
330 err = got_ferror(outfile, GOT_ERR_IO);
334 csum_output(csum, zb->outbuf, avail);
338 } while ((zb->flags & GOT_DEFLATE_F_HAVE_MORE) && len > 0);
343 const struct got_error *
344 got_deflate_to_mem_mmap(uint8_t **outbuf, size_t *outlen,
345 size_t *consumed_total, struct got_deflate_checksum *csum, uint8_t *map,
346 size_t offset, size_t len)
348 const struct got_error *err;
349 size_t avail, consumed;
350 struct got_deflate_buf zb;
355 *outbuf = malloc(GOT_DEFLATE_BUFSIZE);
357 return got_error_from_errno("malloc");
358 err = got_deflate_init(&zb, *outbuf, GOT_DEFLATE_BUFSIZE);
365 err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
374 err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
380 *consumed_total += consumed;
382 if (avail > 0 && csum)
383 csum_output(csum, zb.outbuf, avail);
385 if ((zb.flags & GOT_DEFLATE_F_HAVE_MORE) && outbuf != NULL) {
386 newbuf = reallocarray(*outbuf, ++nbuf,
387 GOT_DEFLATE_BUFSIZE);
388 if (newbuf == NULL) {
389 err = got_error_from_errno("reallocarray");
396 zb.outbuf = newbuf + *outlen;
397 zb.outlen = (nbuf * GOT_DEFLATE_BUFSIZE) - *outlen;
399 } while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
401 got_deflate_end(&zb);