/src/libzip/lib/zip_source_window.c

Source
/*
  zip_source_window.c -- return part of lower source
  Copyright (C) 2012-2024 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.
  The authors can be contacted at <info@libzip.org>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
  3. The names of the authors may not be used to endorse or promote
     products derived from this software without specific prior
     written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "zipint.h"

#include <stdlib.h>
#include <string.h>

struct window {
    zip_uint64_t start; /* where in file we start reading */
    zip_uint64_t end;   /* where in file we stop reading */
    bool end_valid;     /* whether end is set, otherwise read until EOF */

    /* if not NULL, read file data for this file */
    zip_t *source_archive;
    zip_uint64_t source_index;

    zip_uint64_t offset; /* offset in src for next read */

    zip_stat_t stat;
    zip_uint64_t stat_invalid;
    zip_file_attributes_t attributes;
    zip_dostime_t dostime;
    bool dostime_valid;
    zip_error_t error;
    zip_int64_t supports;
    bool needs_seek;
};

static zip_int64_t window_read(zip_source_t *, void *, void *, zip_uint64_t, zip_source_cmd_t);


ZIP_EXTERN zip_source_t *
zip_source_window_create(zip_source_t *src, zip_uint64_t start, zip_int64_t len, zip_error_t *error) {
    return _zip_source_window_new(src, start, len, NULL, 0, NULL, NULL, NULL, 0, false, error);
}


zip_source_t *
_zip_source_window_new(zip_source_t *src, zip_uint64_t start, zip_int64_t length, zip_stat_t *st, zip_uint64_t st_invalid, zip_file_attributes_t *attributes, zip_dostime_t *dostime, zip_t *source_archive, zip_uint64_t source_index, bool take_ownership, zip_error_t *error) {
    zip_source_t* window_source;
    struct window *ctx;

    if (src == NULL || length < -1 || (source_archive == NULL && source_index != 0)) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return NULL;
    }
    
    if (length >= 0) {
        if (start + (zip_uint64_t)length < start) {
            zip_error_set(error, ZIP_ER_INVAL, 0);
            return NULL;
        }
    }

    if ((ctx = (struct window *)malloc(sizeof(*ctx))) == NULL) {
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }

    ctx->start = start;
    if (length == -1) {
        ctx->end_valid = false;
    }
    else {
        ctx->end = start + (zip_uint64_t)length;
        ctx->end_valid = true;
    }
    zip_stat_init(&ctx->stat);
    ctx->stat_invalid = st_invalid;
    if (attributes != NULL) {
        (void)memcpy_s(&ctx->attributes, sizeof(ctx->attributes), attributes, sizeof(ctx->attributes));
    }
    else {
        zip_file_attributes_init(&ctx->attributes);
    }
    if (dostime != NULL) {
        ctx->dostime = *dostime;
        ctx->dostime_valid = true;
    }
    else {
        ctx->dostime_valid = false;
    }
    ctx->source_archive = source_archive;
    ctx->source_index = source_index;
    zip_error_init(&ctx->error);
    ctx->supports = (zip_source_supports(src) & (ZIP_SOURCE_SUPPORTS_SEEKABLE | ZIP_SOURCE_SUPPORTS_REOPEN)) | (zip_source_make_command_bitmap(ZIP_SOURCE_GET_FILE_ATTRIBUTES, ZIP_SOURCE_GET_DOS_TIME, ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_TELL, ZIP_SOURCE_FREE, -1));
    ctx->needs_seek = (ctx->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_SEEK)) ? true : false;

    if (st) {
        if (_zip_stat_merge(&ctx->stat, st, error) < 0) {
            free(ctx);
            return NULL;
        }
    }
    
    window_source = zip_source_layered_create(src, window_read, ctx, error);
    if (window_source == NULL) {
        free(ctx);
        return NULL;
    }
    if (!take_ownership) {
        zip_source_keep(src);
    }
    return window_source;
}


int
_zip_source_set_source_archive(zip_source_t *src, zip_t *za) {
    src->source_archive = za;
    return _zip_register_source(za, src);
}


/* called by zip_discard to avoid operating on file from closed archive */
void
_zip_source_invalidate(zip_source_t *src) {
    src->source_closed = 1;

    if (zip_error_code_zip(&src->error) == ZIP_ER_OK) {
        zip_error_set(&src->error, ZIP_ER_ZIPCLOSED, 0);
    }
}


static zip_int64_t
window_read(zip_source_t *src, void *_ctx, void *data, zip_uint64_t len, zip_source_cmd_t cmd) {
    struct window *ctx;
    zip_int64_t ret;
    zip_uint64_t n, i;

    ctx = (struct window *)_ctx;

    switch (cmd) {
    case ZIP_SOURCE_CLOSE:
        return 0;

    case ZIP_SOURCE_ERROR:
        return zip_error_to_data(&ctx->error, data, len);

    case ZIP_SOURCE_FREE:
        free(ctx);
        return 0;

    case ZIP_SOURCE_OPEN:
        if (ctx->source_archive) {
            zip_uint64_t offset;

            if ((offset = _zip_file_get_offset(ctx->source_archive, ctx->source_index, &ctx->error)) == 0) {
                return -1;
            }
            if (ctx->end + offset < ctx->end) {
                /* zip archive data claims end of data past zip64 limits */
                zip_error_set(&ctx->error, ZIP_ER_INCONS, MAKE_DETAIL_WITH_INDEX(ZIP_ER_DETAIL_CDIR_ENTRY_INVALID, ctx->source_index));
                return -1;
            }
            ctx->start += offset;
            ctx->end += offset;
            ctx->source_archive = NULL;
        }

        if (!ctx->needs_seek) {
            DEFINE_BYTE_ARRAY(b, BUFSIZE);

            if (!byte_array_init(b, BUFSIZE)) {
                zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
                return -1;
            }

            for (n = 0; n < ctx->start; n += (zip_uint64_t)ret) {
                i = (ctx->start - n > BUFSIZE ? BUFSIZE : ctx->start - n);
                if ((ret = zip_source_read(src, b, i)) < 0) {
                    zip_error_set_from_source(&ctx->error, src);
                    byte_array_fini(b);
                    return -1;
                }
                if (ret == 0) {
                    zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
                    byte_array_fini(b);
                    return -1;
                }
            }

            byte_array_fini(b);
        }

        ctx->offset = ctx->start;
        return 0;

    case ZIP_SOURCE_READ:
        if (ctx->end_valid && len > ctx->end - ctx->offset) {
            len = ctx->end - ctx->offset;
        }

        if (len == 0) {
            return 0;
        }

        if (ctx->needs_seek) {
            if (zip_source_seek(src, (zip_int64_t)ctx->offset, SEEK_SET) < 0) {
                zip_error_set_from_source(&ctx->error, src);
                return -1;
            }
        }

        if ((ret = zip_source_read(src, data, len)) < 0) {
            zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
            return -1;
        }

        ctx->offset += (zip_uint64_t)ret;

        if (ret == 0) {
            if (ctx->end_valid && ctx->offset < ctx->end) {
                zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
                return -1;
            }
        }
        return ret;

    case ZIP_SOURCE_SEEK: {
        zip_int64_t new_offset;
        
        if (!ctx->end_valid) {
            zip_source_args_seek_t *args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error);
            
            if (args == NULL) {
                return -1;
            }
            if (args->whence == SEEK_END) {
                if (zip_source_seek(src, args->offset, args->whence) < 0) {
                    zip_error_set_from_source(&ctx->error, src);
                    return -1;
                }
                new_offset = zip_source_tell(src);
                if (new_offset < 0) {
                    zip_error_set_from_source(&ctx->error, src);
                    return -1;
                }
                if ((zip_uint64_t)new_offset < ctx->start) {
                    zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
                    (void)zip_source_seek(src, (zip_int64_t)ctx->offset, SEEK_SET);
                    return -1;
                }
                ctx->offset = (zip_uint64_t)new_offset;
                return 0;
            }
        }

        new_offset = zip_source_seek_compute_offset(ctx->offset - ctx->start, ctx->end - ctx->start, data, len, &ctx->error);
        
        if (new_offset < 0) {
            return -1;
        }
        
        ctx->offset = (zip_uint64_t)new_offset + ctx->start;
        return 0;
    }

    case ZIP_SOURCE_STAT: {
        zip_stat_t *st;

        st = (zip_stat_t *)data;

        if (_zip_stat_merge(st, &ctx->stat, &ctx->error) < 0) {
            return -1;
        }

        if (!(ctx->stat.valid & ZIP_STAT_SIZE)) {
            if (ctx->end_valid) {
                st->valid |= ZIP_STAT_SIZE;
                st->size = ctx->end - ctx->start;
            }
            else if (st->valid & ZIP_STAT_SIZE) {
                st->size -= ctx->start;
            }
        }

        st->valid &= ~ctx->stat_invalid;

        return 0;
    }

    case ZIP_SOURCE_GET_FILE_ATTRIBUTES:
        if (len < sizeof(ctx->attributes)) {
            zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
            return -1;
        }

        (void)memcpy_s(data, sizeof(ctx->attributes), &ctx->attributes, sizeof(ctx->attributes));
        return sizeof(ctx->attributes);

    case ZIP_SOURCE_GET_DOS_TIME:
        if (len < sizeof(ctx->dostime)) {
            zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
            return -1;
        }
        if (ctx->dostime_valid) {
            (void)memcpy_s(data, sizeof(ctx->dostime), &ctx->dostime, sizeof(ctx->dostime));
            return sizeof(ctx->dostime);
        }
        else {
            return 0;
        }

    case ZIP_SOURCE_SUPPORTS:
        return ctx->supports;

    case ZIP_SOURCE_TELL:
        return (zip_int64_t)(ctx->offset - ctx->start);

    default:
        return zip_source_pass_to_lower_layer(src, data, len, cmd);
    }
}


void
_zip_deregister_source(zip_t *za, zip_source_t *src) {
    zip_uint64_t i;

    for (i = 0; i < za->nopen_source; i++) {
        if (za->open_source[i] == src) {
            za->open_source[i] = za->open_source[za->nopen_source - 1];
            za->nopen_source--;
            break;
        }
    }
}


int
_zip_register_source(zip_t *za, zip_source_t *src) {
    if (za->nopen_source + 1 >= za->nopen_source_alloc) {
        if (!ZIP_REALLOC(za->open_source, za->nopen_source_alloc, 10, &za->error)) {
            return -1;
        }
    }

    za->open_source[za->nopen_source++] = src;

    return 0;
}

Coverage Report

Created: 2025-12-03 06:06

Line	Count	Source
1		/*
2		zip_source_window.c -- return part of lower source
3		Copyright (C) 2012-2024 Dieter Baron and Thomas Klausner
4
5		This file is part of libzip, a library to manipulate ZIP archives.
6		The authors can be contacted at <info@libzip.org>
7
8		Redistribution and use in source and binary forms, with or without
9		modification, are permitted provided that the following conditions
10		are met:
11		1. Redistributions of source code must retain the above copyright
12		notice, this list of conditions and the following disclaimer.
13		2. Redistributions in binary form must reproduce the above copyright
14		notice, this list of conditions and the following disclaimer in
15		the documentation and/or other materials provided with the
16		distribution.
17		3. The names of the authors may not be used to endorse or promote
18		products derived from this software without specific prior
19		written permission.
20
21		THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
22		OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23		WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24		ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25		DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26		DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27		GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28		INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29		IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30		OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31		IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32		*/
33
34		#include "zipint.h"
35
36		#include <stdlib.h>
37		#include <string.h>
38
39		struct window {
40		zip_uint64_t start; /* where in file we start reading */
41		zip_uint64_t end; /* where in file we stop reading */
42		bool end_valid; /* whether end is set, otherwise read until EOF */
43
44		/* if not NULL, read file data for this file */
45		zip_t *source_archive;
46		zip_uint64_t source_index;
47
48		zip_uint64_t offset; /* offset in src for next read */
49
50		zip_stat_t stat;
51		zip_uint64_t stat_invalid;
52		zip_file_attributes_t attributes;
53		zip_dostime_t dostime;
54		bool dostime_valid;
55		zip_error_t error;
56		zip_int64_t supports;
57		bool needs_seek;
58		};
59
60		static zip_int64_t window_read(zip_source_t , void , void *, zip_uint64_t, zip_source_cmd_t);
61
62
63		ZIP_EXTERN zip_source_t *
64	0	zip_source_window_create(zip_source_t src, zip_uint64_t start, zip_int64_t len, zip_error_t error) {
65	0	return _zip_source_window_new(src, start, len, NULL, 0, NULL, NULL, NULL, 0, false, error);
66	0	}
67
68
69		zip_source_t *
70	47.3k	_zip_source_window_new(zip_source_t src, zip_uint64_t start, zip_int64_t length, zip_stat_t st, zip_uint64_t st_invalid, zip_file_attributes_t attributes, zip_dostime_t dostime, zip_t source_archive, zip_uint64_t source_index, bool take_ownership, zip_error_t error) {
71	47.3k	zip_source_t* window_source;
72	47.3k	struct window *ctx;
73
74	47.3k	if (src == NULL \|\| length < -1 \|\| (source_archive == NULL && source_index != 0)) {
75	0	zip_error_set(error, ZIP_ER_INVAL, 0);
76	0	return NULL;
77	0	}
78
79	47.3k	if (length >= 0) {
80	47.3k	if (start + (zip_uint64_t)length < start) {
81	0	zip_error_set(error, ZIP_ER_INVAL, 0);
82	0	return NULL;
83	0	}
84	47.3k	}
85
86	47.3k	if ((ctx = (struct window )malloc(sizeof(ctx))) == NULL) {
87	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
88	0	return NULL;
89	0	}
90
91	47.3k	ctx->start = start;
92	47.3k	if (length == -1) {
93	0	ctx->end_valid = false;
94	0	}
95	47.3k	else {
96	47.3k	ctx->end = start + (zip_uint64_t)length;
97	47.3k	ctx->end_valid = true;
98	47.3k	}
99	47.3k	zip_stat_init(&ctx->stat);
100	47.3k	ctx->stat_invalid = st_invalid;
101	47.3k	if (attributes != NULL) {
102	47.2k	(void)memcpy_s(&ctx->attributes, sizeof(ctx->attributes), attributes, sizeof(ctx->attributes));
103	47.2k	}
104	120	else {
105	120	zip_file_attributes_init(&ctx->attributes);
106	120	}
107	47.3k	if (dostime != NULL) {
108	47.2k	ctx->dostime = *dostime;
109	47.2k	ctx->dostime_valid = true;
110	47.2k	}
111	120	else {
112	120	ctx->dostime_valid = false;
113	120	}
114	47.3k	ctx->source_archive = source_archive;
115	47.3k	ctx->source_index = source_index;
116	47.3k	zip_error_init(&ctx->error);
117	47.3k	ctx->supports = (zip_source_supports(src) & (ZIP_SOURCE_SUPPORTS_SEEKABLE \| ZIP_SOURCE_SUPPORTS_REOPEN)) \| (zip_source_make_command_bitmap(ZIP_SOURCE_GET_FILE_ATTRIBUTES, ZIP_SOURCE_GET_DOS_TIME, ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_TELL, ZIP_SOURCE_FREE, -1));
118	47.3k	ctx->needs_seek = (ctx->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_SEEK)) ? true : false;
119
120	47.3k	if (st) {
121	47.3k	if (_zip_stat_merge(&ctx->stat, st, error) < 0) {
122	0	free(ctx);
123	0	return NULL;
124	0	}
125	47.3k	}
126
127	47.3k	window_source = zip_source_layered_create(src, window_read, ctx, error);
128	47.3k	if (window_source == NULL) {
129	0	free(ctx);
130	0	return NULL;
131	0	}
132	47.3k	if (!take_ownership) {
133	41.2k	zip_source_keep(src);
134	41.2k	}
135	47.3k	return window_source;
136	47.3k	}
137
138
139		int
140	47.2k	_zip_source_set_source_archive(zip_source_t src, zip_t za) {
141	47.2k	src->source_archive = za;
142	47.2k	return _zip_register_source(za, src);
143	47.2k	}
144
145
146		/* called by zip_discard to avoid operating on file from closed archive */
147		void
148	0	_zip_source_invalidate(zip_source_t *src) {
149	0	src->source_closed = 1;
150
151	0	if (zip_error_code_zip(&src->error) == ZIP_ER_OK) {
152	0	zip_error_set(&src->error, ZIP_ER_ZIPCLOSED, 0);
153	0	}
154	0	}
155
156
157		static zip_int64_t
158	338k	window_read(zip_source_t src, void _ctx, void *data, zip_uint64_t len, zip_source_cmd_t cmd) {
159	338k	struct window *ctx;
160	338k	zip_int64_t ret;
161	338k	zip_uint64_t n, i;
162
163	338k	ctx = (struct window *)_ctx;
164
165	338k	switch (cmd) {
166	35.3k	case ZIP_SOURCE_CLOSE:
167	35.3k	return 0;
168
169	17.2k	case ZIP_SOURCE_ERROR:
170	17.2k	return zip_error_to_data(&ctx->error, data, len);
171
172	47.3k	case ZIP_SOURCE_FREE:
173	47.3k	free(ctx);
174	47.3k	return 0;
175
176	41.0k	case ZIP_SOURCE_OPEN:
177	41.0k	if (ctx->source_archive) {
178	35.8k	zip_uint64_t offset;
179
180	35.8k	if ((offset = _zip_file_get_offset(ctx->source_archive, ctx->source_index, &ctx->error)) == 0) {
181	5.66k	return -1;
182	5.66k	}
183	30.1k	if (ctx->end + offset < ctx->end) {
184		/* zip archive data claims end of data past zip64 limits */
185	0	zip_error_set(&ctx->error, ZIP_ER_INCONS, MAKE_DETAIL_WITH_INDEX(ZIP_ER_DETAIL_CDIR_ENTRY_INVALID, ctx->source_index));
186	0	return -1;
187	0	}
188	30.1k	ctx->start += offset;
189	30.1k	ctx->end += offset;
190	30.1k	ctx->source_archive = NULL;
191	30.1k	}
192
193	35.3k	if (!ctx->needs_seek) {
194	0	DEFINE_BYTE_ARRAY(b, BUFSIZE);
195
196	0	if (!byte_array_init(b, BUFSIZE)) {
197	0	zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
198	0	return -1;
199	0	}
200
201	0	for (n = 0; n < ctx->start; n += (zip_uint64_t)ret) {
202	0	i = (ctx->start - n > BUFSIZE ? BUFSIZE : ctx->start - n);
203	0	if ((ret = zip_source_read(src, b, i)) < 0) {
204	0	zip_error_set_from_source(&ctx->error, src);
205	0	byte_array_fini(b);
206	0	return -1;
207	0	}
208	0	if (ret == 0) {
209	0	zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
210	0	byte_array_fini(b);
211	0	return -1;
212	0	}
213	0	}
214
215	0	byte_array_fini(b);
216	0	}
217
218	35.3k	ctx->offset = ctx->start;
219	35.3k	return 0;
220
221	72.9k	case ZIP_SOURCE_READ:
222	72.9k	if (ctx->end_valid && len > ctx->end - ctx->offset) {
223	38.3k	len = ctx->end - ctx->offset;
224	38.3k	}
225
226	72.9k	if (len == 0) {
227	20.1k	return 0;
228	20.1k	}
229
230	52.7k	if (ctx->needs_seek) {
231	52.7k	if (zip_source_seek(src, (zip_int64_t)ctx->offset, SEEK_SET) < 0) {
232	2.86k	zip_error_set_from_source(&ctx->error, src);
233	2.86k	return -1;
234	2.86k	}
235	52.7k	}
236
237	49.9k	if ((ret = zip_source_read(src, data, len)) < 0) {
238	0	zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
239	0	return -1;
240	0	}
241
242	49.9k	ctx->offset += (zip_uint64_t)ret;
243
244	49.9k	if (ret == 0) {
245	8.72k	if (ctx->end_valid && ctx->offset < ctx->end) {
246	8.72k	zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
247	8.72k	return -1;
248	8.72k	}
249	8.72k	}
250	41.2k	return ret;
251
252	0	case ZIP_SOURCE_SEEK: {
253	0	zip_int64_t new_offset;
254
255	0	if (!ctx->end_valid) {
256	0	zip_source_args_seek_t *args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error);
257
258	0	if (args == NULL) {
259	0	return -1;
260	0	}
261	0	if (args->whence == SEEK_END) {
262	0	if (zip_source_seek(src, args->offset, args->whence) < 0) {
263	0	zip_error_set_from_source(&ctx->error, src);
264	0	return -1;
265	0	}
266	0	new_offset = zip_source_tell(src);
267	0	if (new_offset < 0) {
268	0	zip_error_set_from_source(&ctx->error, src);
269	0	return -1;
270	0	}
271	0	if ((zip_uint64_t)new_offset < ctx->start) {
272	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
273	0	(void)zip_source_seek(src, (zip_int64_t)ctx->offset, SEEK_SET);
274	0	return -1;
275	0	}
276	0	ctx->offset = (zip_uint64_t)new_offset;
277	0	return 0;
278	0	}
279	0	}
280
281	0	new_offset = zip_source_seek_compute_offset(ctx->offset - ctx->start, ctx->end - ctx->start, data, len, &ctx->error);
282
283	0	if (new_offset < 0) {
284	0	return -1;
285	0	}
286
287	0	ctx->offset = (zip_uint64_t)new_offset + ctx->start;
288	0	return 0;
289	0	}
290
291	44.1k	case ZIP_SOURCE_STAT: {
292	44.1k	zip_stat_t *st;
293
294	44.1k	st = (zip_stat_t *)data;
295
296	44.1k	if (_zip_stat_merge(st, &ctx->stat, &ctx->error) < 0) {
297	0	return -1;
298	0	}
299
300	44.1k	if (!(ctx->stat.valid & ZIP_STAT_SIZE)) {
301	0	if (ctx->end_valid) {
302	0	st->valid \|= ZIP_STAT_SIZE;
303	0	st->size = ctx->end - ctx->start;
304	0	}
305	0	else if (st->valid & ZIP_STAT_SIZE) {
306	0	st->size -= ctx->start;
307	0	}
308	0	}
309
310	44.1k	st->valid &= ~ctx->stat_invalid;
311
312	44.1k	return 0;
313	44.1k	}
314
315	29.2k	case ZIP_SOURCE_GET_FILE_ATTRIBUTES:
316	29.2k	if (len < sizeof(ctx->attributes)) {
317	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
318	0	return -1;
319	0	}
320
321	29.2k	(void)memcpy_s(data, sizeof(ctx->attributes), &ctx->attributes, sizeof(ctx->attributes));
322	29.2k	return sizeof(ctx->attributes);
323
324	3.99k	case ZIP_SOURCE_GET_DOS_TIME:
325	3.99k	if (len < sizeof(ctx->dostime)) {
326	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
327	0	return -1;
328	0	}
329	3.99k	if (ctx->dostime_valid) {
330	3.99k	(void)memcpy_s(data, sizeof(ctx->dostime), &ctx->dostime, sizeof(ctx->dostime));
331	3.99k	return sizeof(ctx->dostime);
332	3.99k	}
333	0	else {
334	0	return 0;
335	0	}
336
337	47.3k	case ZIP_SOURCE_SUPPORTS:
338	47.3k	return ctx->supports;
339
340	0	case ZIP_SOURCE_TELL:
341	0	return (zip_int64_t)(ctx->offset - ctx->start);
342
343	0	default:
344	0	return zip_source_pass_to_lower_layer(src, data, len, cmd);
345	338k	}
346	338k	}
347
348
349		void
350	47.2k	_zip_deregister_source(zip_t za, zip_source_t src) {
351	47.2k	zip_uint64_t i;
352
353	47.2k	for (i = 0; i < za->nopen_source; i++) {
354	47.2k	if (za->open_source[i] == src) {
355	47.2k	za->open_source[i] = za->open_source[za->nopen_source - 1];
356	47.2k	za->nopen_source--;
357	47.2k	break;
358	47.2k	}
359	47.2k	}
360	47.2k	}
361
362
363		int
364	47.2k	_zip_register_source(zip_t za, zip_source_t src) {
365	47.2k	if (za->nopen_source + 1 >= za->nopen_source_alloc) {
366	2.89k	if (!ZIP_REALLOC(za->open_source, za->nopen_source_alloc, 10, &za->error)) {
367	0	return -1;
368	0	}
369	2.89k	}
370
371	47.2k	za->open_source[za->nopen_source++] = src;
372
373	47.2k	return 0;
374	47.2k	}