1 2181e0c8 2019-03-19 stsp /*
  2 2181e0c8 2019-03-19 stsp  * Copyright (c) 2019 Stefan Sperling <stsp@openbsd.org>
  3 2181e0c8 2019-03-19 stsp  *
  4 2181e0c8 2019-03-19 stsp  * Permission to use, copy, modify, and distribute this software for any
  5 2181e0c8 2019-03-19 stsp  * purpose with or without fee is hereby granted, provided that the above
  6 2181e0c8 2019-03-19 stsp  * copyright notice and this permission notice appear in all copies.
  7 2181e0c8 2019-03-19 stsp  *
  8 2181e0c8 2019-03-19 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 2181e0c8 2019-03-19 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 2181e0c8 2019-03-19 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 2181e0c8 2019-03-19 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 2181e0c8 2019-03-19 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 2181e0c8 2019-03-19 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 2181e0c8 2019-03-19 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 2181e0c8 2019-03-19 stsp  */
 16 2181e0c8 2019-03-19 stsp 
 17 8b925c6c 2022-07-16 thomas #include <sys/queue.h>
 18 2181e0c8 2019-03-19 stsp 
 19 2181e0c8 2019-03-19 stsp #include <errno.h>
 20 2181e0c8 2019-03-19 stsp #include <stdio.h>
 21 2181e0c8 2019-03-19 stsp #include <stdlib.h>
 22 2181e0c8 2019-03-19 stsp #include <string.h>
 23 2181e0c8 2019-03-19 stsp #include <zlib.h>
 24 2181e0c8 2019-03-19 stsp #include <time.h>
 25 2181e0c8 2019-03-19 stsp 
 26 2181e0c8 2019-03-19 stsp #include "got_error.h"
 27 2181e0c8 2019-03-19 stsp #include "got_object.h"
 28 324d37e7 2019-05-11 stsp #include "got_path.h"
 29 2181e0c8 2019-03-19 stsp 
 30 2181e0c8 2019-03-19 stsp #include "got_lib_deflate.h"
 31 2181e0c8 2019-03-19 stsp 
 32 2181e0c8 2019-03-19 stsp #ifndef MIN
 33 2181e0c8 2019-03-19 stsp #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
 34 2181e0c8 2019-03-19 stsp #endif
 35 2181e0c8 2019-03-19 stsp 
 36 2181e0c8 2019-03-19 stsp const struct got_error *
 37 3b9e6fcf 2021-06-05 stsp got_deflate_init(struct got_deflate_buf *zb, uint8_t *outbuf, size_t bufsize)
 38 2181e0c8 2019-03-19 stsp {
 39 2181e0c8 2019-03-19 stsp 	const struct got_error *err = NULL;
 40 2181e0c8 2019-03-19 stsp 	int zerr;
 41 2181e0c8 2019-03-19 stsp 
 42 2181e0c8 2019-03-19 stsp 	memset(&zb->z, 0, sizeof(zb->z));
 43 2181e0c8 2019-03-19 stsp 
 44 2181e0c8 2019-03-19 stsp 	zb->z.zalloc = Z_NULL;
 45 2181e0c8 2019-03-19 stsp 	zb->z.zfree = Z_NULL;
 46 2181e0c8 2019-03-19 stsp 	zerr = deflateInit(&zb->z, Z_DEFAULT_COMPRESSION);
 47 2181e0c8 2019-03-19 stsp 	if (zerr != Z_OK) {
 48 2181e0c8 2019-03-19 stsp 		if  (zerr == Z_ERRNO)
 49 638f9024 2019-05-13 stsp 			return got_error_from_errno("deflateInit");
 50 2181e0c8 2019-03-19 stsp 		if  (zerr == Z_MEM_ERROR) {
 51 2181e0c8 2019-03-19 stsp 			errno = ENOMEM;
 52 638f9024 2019-05-13 stsp 			return got_error_from_errno("deflateInit");
 53 2181e0c8 2019-03-19 stsp 		}
 54 2181e0c8 2019-03-19 stsp 		return got_error(GOT_ERR_COMPRESSION);
 55 2181e0c8 2019-03-19 stsp 	}
 56 2181e0c8 2019-03-19 stsp 
 57 2181e0c8 2019-03-19 stsp 	zb->inlen = zb->outlen = bufsize;
 58 2181e0c8 2019-03-19 stsp 
 59 2181e0c8 2019-03-19 stsp 	zb->inbuf = calloc(1, zb->inlen);
 60 2181e0c8 2019-03-19 stsp 	if (zb->inbuf == NULL) {
 61 638f9024 2019-05-13 stsp 		err = got_error_from_errno("calloc");
 62 2181e0c8 2019-03-19 stsp 		goto done;
 63 2181e0c8 2019-03-19 stsp 	}
 64 2181e0c8 2019-03-19 stsp 
 65 2181e0c8 2019-03-19 stsp 	zb->flags = 0;
 66 2181e0c8 2019-03-19 stsp 	if (outbuf == NULL) {
 67 2181e0c8 2019-03-19 stsp 		zb->outbuf = calloc(1, zb->outlen);
 68 2181e0c8 2019-03-19 stsp 		if (zb->outbuf == NULL) {
 69 638f9024 2019-05-13 stsp 			err = got_error_from_errno("calloc");
 70 2181e0c8 2019-03-19 stsp 			goto done;
 71 2181e0c8 2019-03-19 stsp 		}
 72 2181e0c8 2019-03-19 stsp 		zb->flags |= GOT_DEFLATE_F_OWN_OUTBUF;
 73 2181e0c8 2019-03-19 stsp 	} else
 74 2181e0c8 2019-03-19 stsp 		zb->outbuf = outbuf;
 75 2181e0c8 2019-03-19 stsp done:
 76 2181e0c8 2019-03-19 stsp 	if (err)
 77 2181e0c8 2019-03-19 stsp 		got_deflate_end(zb);
 78 2181e0c8 2019-03-19 stsp 	return err;
 79 2181e0c8 2019-03-19 stsp }
 80 2181e0c8 2019-03-19 stsp 
 81 91b40e30 2021-05-21 stsp static void
 82 dbaa2362 2021-09-28 thomas csum_output(struct got_deflate_checksum *csum, const uint8_t *buf, size_t len)
 83 91b40e30 2021-05-21 stsp {
 84 91b40e30 2021-05-21 stsp 	if (csum->output_crc)
 85 91b40e30 2021-05-21 stsp 		*csum->output_crc = crc32(*csum->output_crc, buf, len);
 86 91b40e30 2021-05-21 stsp 
 87 91b40e30 2021-05-21 stsp 	if (csum->output_sha1)
 88 91b40e30 2021-05-21 stsp 		SHA1Update(csum->output_sha1, buf, len);
 89 91b40e30 2021-05-21 stsp }
 90 91b40e30 2021-05-21 stsp 
 91 2181e0c8 2019-03-19 stsp const struct got_error *
 92 e8f02263 2022-01-23 thomas got_deflate_read(struct got_deflate_buf *zb, FILE *f, off_t len,
 93 e8f02263 2022-01-23 thomas     size_t *outlenp, off_t *consumed)
 94 2181e0c8 2019-03-19 stsp {
 95 2181e0c8 2019-03-19 stsp 	size_t last_total_out = zb->z.total_out;
 96 2181e0c8 2019-03-19 stsp 	z_stream *z = &zb->z;
 97 2181e0c8 2019-03-19 stsp 	int ret = Z_ERRNO;
 98 2181e0c8 2019-03-19 stsp 
 99 2181e0c8 2019-03-19 stsp 	z->next_out = zb->outbuf;
100 2181e0c8 2019-03-19 stsp 	z->avail_out = zb->outlen;
101 2181e0c8 2019-03-19 stsp 
102 2181e0c8 2019-03-19 stsp 	*outlenp = 0;
103 e8f02263 2022-01-23 thomas 	*consumed = 0;
104 2181e0c8 2019-03-19 stsp 	do {
105 e8f02263 2022-01-23 thomas 		size_t last_total_in = z->total_in;
106 2181e0c8 2019-03-19 stsp 		if (z->avail_in == 0) {
107 e8f02263 2022-01-23 thomas 			size_t n = 0;
108 e8f02263 2022-01-23 thomas 			if (*consumed < len) {
109 e8f02263 2022-01-23 thomas 				n = fread(zb->inbuf, 1,
110 e8f02263 2022-01-23 thomas 				    MIN(zb->inlen, len - *consumed), f);
111 e8f02263 2022-01-23 thomas 			}
112 2181e0c8 2019-03-19 stsp 			if (n == 0) {
113 2181e0c8 2019-03-19 stsp 				if (ferror(f))
114 2181e0c8 2019-03-19 stsp 					return got_ferror(f, GOT_ERR_IO);
115 2181e0c8 2019-03-19 stsp 				/* EOF */
116 4e4a7005 2019-04-13 stsp 				ret = deflate(z, Z_FINISH);
117 2181e0c8 2019-03-19 stsp 				break;
118 2181e0c8 2019-03-19 stsp 			}
119 2181e0c8 2019-03-19 stsp 			z->next_in = zb->inbuf;
120 2181e0c8 2019-03-19 stsp 			z->avail_in = n;
121 2181e0c8 2019-03-19 stsp 		}
122 2181e0c8 2019-03-19 stsp 		ret = deflate(z, Z_NO_FLUSH);
123 e8f02263 2022-01-23 thomas 		*consumed += z->total_in - last_total_in;
124 2181e0c8 2019-03-19 stsp 	} while (ret == Z_OK && z->avail_out > 0);
125 2181e0c8 2019-03-19 stsp 
126 2181e0c8 2019-03-19 stsp 	if (ret == Z_OK) {
127 2181e0c8 2019-03-19 stsp 		zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
128 2181e0c8 2019-03-19 stsp 	} else {
129 2181e0c8 2019-03-19 stsp 		if (ret != Z_STREAM_END)
130 2181e0c8 2019-03-19 stsp 			return got_error(GOT_ERR_COMPRESSION);
131 2181e0c8 2019-03-19 stsp 		zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
132 2181e0c8 2019-03-19 stsp 	}
133 2181e0c8 2019-03-19 stsp 
134 2181e0c8 2019-03-19 stsp 	*outlenp = z->total_out - last_total_out;
135 2181e0c8 2019-03-19 stsp 	return NULL;
136 2181e0c8 2019-03-19 stsp }
137 2181e0c8 2019-03-19 stsp 
138 9249e7e3 2022-05-12 thomas static const struct got_error *
139 9249e7e3 2022-05-12 thomas deflate_read_mmap(struct got_deflate_buf *zb, uint8_t *map, size_t offset,
140 9249e7e3 2022-05-12 thomas     size_t len, size_t *outlenp, size_t *consumed, int flush_on_eof)
141 2b0ae357 2022-01-10 thomas {
142 2b0ae357 2022-01-10 thomas 	z_stream *z = &zb->z;
143 2b0ae357 2022-01-10 thomas 	size_t last_total_out = z->total_out;
144 2b0ae357 2022-01-10 thomas 	int ret = Z_ERRNO;
145 2b0ae357 2022-01-10 thomas 
146 2b0ae357 2022-01-10 thomas 	z->next_out = zb->outbuf;
147 2b0ae357 2022-01-10 thomas 	z->avail_out = zb->outlen;
148 2b0ae357 2022-01-10 thomas 
149 2b0ae357 2022-01-10 thomas 	*outlenp = 0;
150 2b0ae357 2022-01-10 thomas 	*consumed = 0;
151 2b0ae357 2022-01-10 thomas 	do {
152 2b0ae357 2022-01-10 thomas 		size_t last_total_in = z->total_in;
153 2b0ae357 2022-01-10 thomas 		if (z->avail_in == 0) {
154 2b0ae357 2022-01-10 thomas 			z->next_in = map + offset + *consumed;
155 f6a55b40 2022-02-12 thomas 			if (len - *consumed > UINT_MAX)
156 f6a55b40 2022-02-12 thomas 				z->avail_in = UINT_MAX;
157 f6a55b40 2022-02-12 thomas 			else
158 f6a55b40 2022-02-12 thomas 				z->avail_in = len - *consumed;
159 2b0ae357 2022-01-10 thomas 			if (z->avail_in == 0) {
160 2b0ae357 2022-01-10 thomas 				/* EOF */
161 9249e7e3 2022-05-12 thomas 				if (flush_on_eof)
162 9249e7e3 2022-05-12 thomas 					ret = deflate(z, Z_FINISH);
163 2b0ae357 2022-01-10 thomas 				break;
164 2b0ae357 2022-01-10 thomas 			}
165 2b0ae357 2022-01-10 thomas 		}
166 2b0ae357 2022-01-10 thomas 		ret = deflate(z, Z_NO_FLUSH);
167 2b0ae357 2022-01-10 thomas 		*consumed += z->total_in - last_total_in;
168 2b0ae357 2022-01-10 thomas 	} while (ret == Z_OK && z->avail_out > 0);
169 2b0ae357 2022-01-10 thomas 
170 2b0ae357 2022-01-10 thomas 	if (ret == Z_OK) {
171 2b0ae357 2022-01-10 thomas 		zb->flags |= GOT_DEFLATE_F_HAVE_MORE;
172 2b0ae357 2022-01-10 thomas 	} else {
173 2b0ae357 2022-01-10 thomas 		if (ret != Z_STREAM_END)
174 2b0ae357 2022-01-10 thomas 			return got_error(GOT_ERR_COMPRESSION);
175 2b0ae357 2022-01-10 thomas 		zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
176 2b0ae357 2022-01-10 thomas 	}
177 2b0ae357 2022-01-10 thomas 
178 2b0ae357 2022-01-10 thomas 	*outlenp = z->total_out - last_total_out;
179 9249e7e3 2022-05-12 thomas 	return NULL;
180 9249e7e3 2022-05-12 thomas }
181 9249e7e3 2022-05-12 thomas 
182 9249e7e3 2022-05-12 thomas const struct got_error *
183 9249e7e3 2022-05-12 thomas got_deflate_read_mmap(struct got_deflate_buf *zb, uint8_t *map, size_t offset,
184 9249e7e3 2022-05-12 thomas     size_t len, size_t *outlenp, size_t *consumed)
185 9249e7e3 2022-05-12 thomas {
186 9249e7e3 2022-05-12 thomas 	return deflate_read_mmap(zb, map, offset, len, outlenp, consumed, 1);
187 9249e7e3 2022-05-12 thomas }
188 9249e7e3 2022-05-12 thomas 
189 9249e7e3 2022-05-12 thomas const struct got_error *
190 9249e7e3 2022-05-12 thomas got_deflate_flush(struct got_deflate_buf *zb, FILE *outfile,
191 9249e7e3 2022-05-12 thomas     struct got_deflate_checksum *csum, off_t *outlenp)
192 9249e7e3 2022-05-12 thomas {
193 9249e7e3 2022-05-12 thomas 	int ret;
194 9249e7e3 2022-05-12 thomas 	size_t n;
195 9249e7e3 2022-05-12 thomas 	z_stream *z = &zb->z;
196 9249e7e3 2022-05-12 thomas 
197 9249e7e3 2022-05-12 thomas 	if (z->avail_in != 0)
198 9249e7e3 2022-05-12 thomas 		return got_error_msg(GOT_ERR_COMPRESSION,
199 9249e7e3 2022-05-12 thomas 		    "cannot flush zb with pending input data");
200 9249e7e3 2022-05-12 thomas 
201 9249e7e3 2022-05-12 thomas 	do {
202 9249e7e3 2022-05-12 thomas 		size_t avail, last_total_out = zb->z.total_out;
203 9249e7e3 2022-05-12 thomas 
204 9249e7e3 2022-05-12 thomas 		z->next_out = zb->outbuf;
205 9249e7e3 2022-05-12 thomas 		z->avail_out = zb->outlen;
206 9249e7e3 2022-05-12 thomas 
207 9249e7e3 2022-05-12 thomas 		ret = deflate(z, Z_FINISH);
208 9249e7e3 2022-05-12 thomas 		if (ret != Z_STREAM_END && ret != Z_OK)
209 9249e7e3 2022-05-12 thomas 			return got_error(GOT_ERR_COMPRESSION);
210 9249e7e3 2022-05-12 thomas 
211 9249e7e3 2022-05-12 thomas 		avail = z->total_out - last_total_out;
212 9249e7e3 2022-05-12 thomas 		if (avail > 0) {
213 9249e7e3 2022-05-12 thomas 			n = fwrite(zb->outbuf, avail, 1, outfile);
214 9249e7e3 2022-05-12 thomas 			if (n != 1)
215 9249e7e3 2022-05-12 thomas 				return got_ferror(outfile, GOT_ERR_IO);
216 9249e7e3 2022-05-12 thomas 			if (csum)
217 9249e7e3 2022-05-12 thomas 				csum_output(csum, zb->outbuf, avail);
218 9249e7e3 2022-05-12 thomas 			if (outlenp)
219 9249e7e3 2022-05-12 thomas 				*outlenp += avail;
220 9249e7e3 2022-05-12 thomas 		}
221 9249e7e3 2022-05-12 thomas 	} while (ret != Z_STREAM_END);
222 9249e7e3 2022-05-12 thomas 
223 9249e7e3 2022-05-12 thomas 	zb->flags &= ~GOT_DEFLATE_F_HAVE_MORE;
224 2b0ae357 2022-01-10 thomas 	return NULL;
225 2b0ae357 2022-01-10 thomas }
226 2b0ae357 2022-01-10 thomas 
227 2181e0c8 2019-03-19 stsp void
228 2181e0c8 2019-03-19 stsp got_deflate_end(struct got_deflate_buf *zb)
229 2181e0c8 2019-03-19 stsp {
230 2181e0c8 2019-03-19 stsp 	free(zb->inbuf);
231 2181e0c8 2019-03-19 stsp 	if (zb->flags & GOT_DEFLATE_F_OWN_OUTBUF)
232 2181e0c8 2019-03-19 stsp 		free(zb->outbuf);
233 2181e0c8 2019-03-19 stsp 	deflateEnd(&zb->z);
234 2181e0c8 2019-03-19 stsp }
235 2181e0c8 2019-03-19 stsp 
236 2181e0c8 2019-03-19 stsp const struct got_error *
237 e8f02263 2022-01-23 thomas got_deflate_to_file(off_t *outlen, FILE *infile, off_t len,
238 e8f02263 2022-01-23 thomas     FILE *outfile, struct got_deflate_checksum *csum)
239 2181e0c8 2019-03-19 stsp {
240 2181e0c8 2019-03-19 stsp 	const struct got_error *err;
241 2181e0c8 2019-03-19 stsp 	size_t avail;
242 e8f02263 2022-01-23 thomas 	off_t consumed;
243 2181e0c8 2019-03-19 stsp 	struct got_deflate_buf zb;
244 2181e0c8 2019-03-19 stsp 
245 3b9e6fcf 2021-06-05 stsp 	err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
246 2181e0c8 2019-03-19 stsp 	if (err)
247 2181e0c8 2019-03-19 stsp 		goto done;
248 2181e0c8 2019-03-19 stsp 
249 2181e0c8 2019-03-19 stsp 	*outlen = 0;
250 2181e0c8 2019-03-19 stsp 
251 2181e0c8 2019-03-19 stsp 	do {
252 e8f02263 2022-01-23 thomas 		err = got_deflate_read(&zb, infile, len, &avail, &consumed);
253 2181e0c8 2019-03-19 stsp 		if (err)
254 2181e0c8 2019-03-19 stsp 			goto done;
255 e8f02263 2022-01-23 thomas 		len -= consumed;
256 2181e0c8 2019-03-19 stsp 		if (avail > 0) {
257 2181e0c8 2019-03-19 stsp 			size_t n;
258 2181e0c8 2019-03-19 stsp 			n = fwrite(zb.outbuf, avail, 1, outfile);
259 2181e0c8 2019-03-19 stsp 			if (n != 1) {
260 2181e0c8 2019-03-19 stsp 				err = got_ferror(outfile, GOT_ERR_IO);
261 2181e0c8 2019-03-19 stsp 				goto done;
262 2181e0c8 2019-03-19 stsp 			}
263 3b9e6fcf 2021-06-05 stsp 			if (csum)
264 3b9e6fcf 2021-06-05 stsp 				csum_output(csum, zb.outbuf, avail);
265 2181e0c8 2019-03-19 stsp 			*outlen += avail;
266 2181e0c8 2019-03-19 stsp 		}
267 2181e0c8 2019-03-19 stsp 	} while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
268 2181e0c8 2019-03-19 stsp 
269 2181e0c8 2019-03-19 stsp done:
270 2181e0c8 2019-03-19 stsp 	got_deflate_end(&zb);
271 2181e0c8 2019-03-19 stsp 	return err;
272 2181e0c8 2019-03-19 stsp }
273 2b0ae357 2022-01-10 thomas 
274 2b0ae357 2022-01-10 thomas const struct got_error *
275 e8f02263 2022-01-23 thomas got_deflate_to_file_mmap(off_t *outlen, uint8_t *map, size_t offset,
276 2b0ae357 2022-01-10 thomas     size_t len, FILE *outfile, struct got_deflate_checksum *csum)
277 2b0ae357 2022-01-10 thomas {
278 2b0ae357 2022-01-10 thomas 	const struct got_error *err;
279 2b0ae357 2022-01-10 thomas 	size_t avail, consumed;
280 2b0ae357 2022-01-10 thomas 	struct got_deflate_buf zb;
281 2b0ae357 2022-01-10 thomas 
282 2b0ae357 2022-01-10 thomas 	err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
283 2b0ae357 2022-01-10 thomas 	if (err)
284 2b0ae357 2022-01-10 thomas 		goto done;
285 2b0ae357 2022-01-10 thomas 
286 2b0ae357 2022-01-10 thomas 	*outlen = 0;
287 2b0ae357 2022-01-10 thomas 	do {
288 2b0ae357 2022-01-10 thomas 		err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
289 2b0ae357 2022-01-10 thomas 		    &consumed);
290 2b0ae357 2022-01-10 thomas 		if (err)
291 2b0ae357 2022-01-10 thomas 			goto done;
292 2b0ae357 2022-01-10 thomas 		offset += consumed;
293 2b0ae357 2022-01-10 thomas 		len -= consumed;
294 2b0ae357 2022-01-10 thomas 		if (avail > 0) {
295 2b0ae357 2022-01-10 thomas 			size_t n;
296 2b0ae357 2022-01-10 thomas 			n = fwrite(zb.outbuf, avail, 1, outfile);
297 2b0ae357 2022-01-10 thomas 			if (n != 1) {
298 2b0ae357 2022-01-10 thomas 				err = got_ferror(outfile, GOT_ERR_IO);
299 2b0ae357 2022-01-10 thomas 				goto done;
300 2b0ae357 2022-01-10 thomas 			}
301 2b0ae357 2022-01-10 thomas 			if (csum)
302 2b0ae357 2022-01-10 thomas 				csum_output(csum, zb.outbuf, avail);
303 2b0ae357 2022-01-10 thomas 			*outlen += avail;
304 2b0ae357 2022-01-10 thomas 		}
305 2b0ae357 2022-01-10 thomas 	} while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
306 9249e7e3 2022-05-12 thomas 
307 9249e7e3 2022-05-12 thomas done:
308 9249e7e3 2022-05-12 thomas 	got_deflate_end(&zb);
309 9249e7e3 2022-05-12 thomas 	return err;
310 9249e7e3 2022-05-12 thomas }
311 9249e7e3 2022-05-12 thomas 
312 9249e7e3 2022-05-12 thomas const struct got_error *
313 9249e7e3 2022-05-12 thomas got_deflate_append_to_file_mmap(struct got_deflate_buf *zb, off_t *outlen,
314 9249e7e3 2022-05-12 thomas     uint8_t *map, size_t offset, size_t len, FILE *outfile,
315 9249e7e3 2022-05-12 thomas     struct got_deflate_checksum *csum)
316 9249e7e3 2022-05-12 thomas {
317 9249e7e3 2022-05-12 thomas 	const struct got_error *err;
318 9249e7e3 2022-05-12 thomas 	size_t avail, consumed;
319 9249e7e3 2022-05-12 thomas 
320 9249e7e3 2022-05-12 thomas 	do {
321 9249e7e3 2022-05-12 thomas 		err = deflate_read_mmap(zb, map, offset, len, &avail,
322 9249e7e3 2022-05-12 thomas 		    &consumed, 0);
323 9249e7e3 2022-05-12 thomas 		if (err)
324 9249e7e3 2022-05-12 thomas 			break;
325 9249e7e3 2022-05-12 thomas 		offset += consumed;
326 9249e7e3 2022-05-12 thomas 		len -= consumed;
327 9249e7e3 2022-05-12 thomas 		if (avail > 0) {
328 9249e7e3 2022-05-12 thomas 			size_t n;
329 9249e7e3 2022-05-12 thomas 			n = fwrite(zb->outbuf, avail, 1, outfile);
330 9249e7e3 2022-05-12 thomas 			if (n != 1) {
331 9249e7e3 2022-05-12 thomas 				err = got_ferror(outfile, GOT_ERR_IO);
332 9249e7e3 2022-05-12 thomas 				break;
333 9249e7e3 2022-05-12 thomas 			}
334 9249e7e3 2022-05-12 thomas 			if (csum)
335 9249e7e3 2022-05-12 thomas 				csum_output(csum, zb->outbuf, avail);
336 9249e7e3 2022-05-12 thomas 			if (outlen)
337 9249e7e3 2022-05-12 thomas 				*outlen += avail;
338 9249e7e3 2022-05-12 thomas 		}
339 9249e7e3 2022-05-12 thomas 	} while ((zb->flags & GOT_DEFLATE_F_HAVE_MORE) && len > 0);
340 2b0ae357 2022-01-10 thomas 
341 9249e7e3 2022-05-12 thomas 	return err;
342 9249e7e3 2022-05-12 thomas }
343 9249e7e3 2022-05-12 thomas 
344 9249e7e3 2022-05-12 thomas const struct got_error *
345 9249e7e3 2022-05-12 thomas got_deflate_to_mem_mmap(uint8_t **outbuf, size_t *outlen,
346 9249e7e3 2022-05-12 thomas     size_t *consumed_total, struct got_deflate_checksum *csum, uint8_t *map,
347 9249e7e3 2022-05-12 thomas     size_t offset, size_t len)
348 9249e7e3 2022-05-12 thomas {
349 9249e7e3 2022-05-12 thomas 	const struct got_error *err;
350 9249e7e3 2022-05-12 thomas 	size_t avail, consumed;
351 9249e7e3 2022-05-12 thomas 	struct got_deflate_buf zb;
352 9249e7e3 2022-05-12 thomas 	void *newbuf;
353 9249e7e3 2022-05-12 thomas 	size_t nbuf = 1;
354 9249e7e3 2022-05-12 thomas 
355 9249e7e3 2022-05-12 thomas 	if (outbuf) {
356 9249e7e3 2022-05-12 thomas 		*outbuf = malloc(GOT_DEFLATE_BUFSIZE);
357 9249e7e3 2022-05-12 thomas 		if (*outbuf == NULL)
358 9249e7e3 2022-05-12 thomas 			return got_error_from_errno("malloc");
359 9249e7e3 2022-05-12 thomas 		err = got_deflate_init(&zb, *outbuf, GOT_DEFLATE_BUFSIZE);
360 9249e7e3 2022-05-12 thomas 		if (err) {
361 9249e7e3 2022-05-12 thomas 			free(*outbuf);
362 9249e7e3 2022-05-12 thomas 			*outbuf = NULL;
363 9249e7e3 2022-05-12 thomas 			return err;
364 9249e7e3 2022-05-12 thomas 		}
365 9249e7e3 2022-05-12 thomas 	} else {
366 9249e7e3 2022-05-12 thomas 		err = got_deflate_init(&zb, NULL, GOT_DEFLATE_BUFSIZE);
367 9249e7e3 2022-05-12 thomas 		if (err)
368 9249e7e3 2022-05-12 thomas 			return err;
369 9249e7e3 2022-05-12 thomas 	}
370 9249e7e3 2022-05-12 thomas 
371 9249e7e3 2022-05-12 thomas 	*outlen = 0;
372 9249e7e3 2022-05-12 thomas 	if (consumed_total)
373 9249e7e3 2022-05-12 thomas 		*consumed_total = 0;
374 9249e7e3 2022-05-12 thomas 	do {
375 9249e7e3 2022-05-12 thomas 		err = got_deflate_read_mmap(&zb, map, offset, len, &avail,
376 9249e7e3 2022-05-12 thomas 		    &consumed);
377 9249e7e3 2022-05-12 thomas 		if (err)
378 9249e7e3 2022-05-12 thomas 			goto done;
379 9249e7e3 2022-05-12 thomas 		offset += consumed;
380 9249e7e3 2022-05-12 thomas 		if (consumed_total)
381 9249e7e3 2022-05-12 thomas 			*consumed_total += consumed;
382 9249e7e3 2022-05-12 thomas 		len -= consumed;
383 9249e7e3 2022-05-12 thomas 		if (avail > 0 && csum)
384 9249e7e3 2022-05-12 thomas 			csum_output(csum, zb.outbuf, avail);
385 9249e7e3 2022-05-12 thomas 		*outlen += avail;
386 9249e7e3 2022-05-12 thomas 		if ((zb.flags & GOT_DEFLATE_F_HAVE_MORE) && outbuf != NULL) {
387 9249e7e3 2022-05-12 thomas 			newbuf = reallocarray(*outbuf, ++nbuf,
388 9249e7e3 2022-05-12 thomas 			    GOT_DEFLATE_BUFSIZE);
389 9249e7e3 2022-05-12 thomas 			if (newbuf == NULL) {
390 9249e7e3 2022-05-12 thomas 				err = got_error_from_errno("reallocarray");
391 9249e7e3 2022-05-12 thomas 				free(*outbuf);
392 9249e7e3 2022-05-12 thomas 				*outbuf = NULL;
393 9249e7e3 2022-05-12 thomas 				*outlen = 0;
394 9249e7e3 2022-05-12 thomas 				goto done;
395 9249e7e3 2022-05-12 thomas 			}
396 9249e7e3 2022-05-12 thomas 			*outbuf = newbuf;
397 9249e7e3 2022-05-12 thomas 			zb.outbuf = newbuf + *outlen;
398 9249e7e3 2022-05-12 thomas 			zb.outlen = (nbuf * GOT_DEFLATE_BUFSIZE) - *outlen;
399 9249e7e3 2022-05-12 thomas 		}
400 9249e7e3 2022-05-12 thomas 	} while (zb.flags & GOT_DEFLATE_F_HAVE_MORE);
401 2b0ae357 2022-01-10 thomas done:
402 2b0ae357 2022-01-10 thomas 	got_deflate_end(&zb);
403 2b0ae357 2022-01-10 thomas 	return err;
404 2b0ae357 2022-01-10 thomas }