/src/libzip/lib/zip_source_window.c

Source
/*
  zip_source_window.c -- return part of lower source
  Copyright (C) 2012-2025 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));
    if (ctx->end_valid) {
        ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_AT_EOF);
    }
    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_AT_EOF:
        if (ctx->end_valid) {
            return ctx->offset == ctx->end;
        }
        else {
            return zip_source_pass_to_lower_layer(src, data, len, 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_valid) {
                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->end += offset;
            }
            ctx->start += 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_from_source(&ctx->error, src);
            return -1;
        }

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

        ctx->offset += (zip_uint64_t)ret;
        return ret;

    case ZIP_SOURCE_SEEK: {
        zip_uint64_t length;
        zip_int64_t new_offset;
        zip_source_args_seek_t *args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error);

        /*
          If we don't know the length and seek from the end, we seek in the lower source to get the new offset.
        */
        if (!ctx->end_valid && args->whence == SEEK_END) {
            zip_int64_t lower_offset;

            if (zip_source_seek(src, args->offset, args->whence) < 0) {
                zip_error_set_from_source(&ctx->error, src);
                return -1;
            }
            if ((lower_offset = zip_source_tell(src)) < 0) {
                zip_error_set_from_source(&ctx->error, src);
                return -1;
            }
            if ((zip_uint64_t)lower_offset < ctx->start) {
                zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
                return -1;
            }
            ctx->offset = (zip_uint64_t)lower_offset;
            return 0;
        }

        /* 
          If we don't know the length, we disable the end check in zip_source_seek_compute_offset by passing in the largest possible value and seek in the lower source to validate the new offset.
        */
        length = ctx->end_valid ? (ctx->end - ctx->start) : ZIP_INT64_MAX;
        new_offset = zip_source_seek_compute_offset(ctx->offset - ctx->start, length, data, len, &ctx->error);

        if (new_offset < 0) {
            return -1;
        }

        if (new_offset + ctx->start < ctx->start) {
            zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
            return -1;
        }
        new_offset += ctx->start;

        if (!ctx->end_valid) {
            if (zip_source_seek(src, new_offset, SEEK_SET) < 0) {
                zip_error_set_from_source(&ctx->error, src);
                return -1;
            }
        }
        ctx->offset = (zip_uint64_t)new_offset;
        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: 2026-09-01 07:16

Line	Count	Source
1		/*
2		zip_source_window.c -- return part of lower source
3		Copyright (C) 2012-2025 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	0	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) {
64	0	return _zip_source_window_new(src, start, len, NULL, 0, NULL, NULL, NULL, 0, false, error);
65	0	}
66
67
68	84.9k	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) {
69	84.9k	zip_source_t *window_source;
70	84.9k	struct window *ctx;
71
72	84.9k	if (src == NULL \|\| length < -1 \|\| (source_archive == NULL && source_index != 0)) {
73	0	zip_error_set(error, ZIP_ER_INVAL, 0);
74	0	return NULL;
75	0	}
76
77	84.9k	if (length >= 0) {
78	84.9k	if (start + (zip_uint64_t)length < start) {
79	0	zip_error_set(error, ZIP_ER_INVAL, 0);
80	0	return NULL;
81	0	}
82	84.9k	}
83
84	84.9k	if ((ctx = (struct window )malloc(sizeof(ctx))) == NULL) {
85	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
86	0	return NULL;
87	0	}
88
89	84.9k	ctx->start = start;
90	84.9k	if (length == -1) {
91	0	ctx->end_valid = false;
92	0	}
93	84.9k	else {
94	84.9k	ctx->end = start + (zip_uint64_t)length;
95	84.9k	ctx->end_valid = true;
96	84.9k	}
97	84.9k	zip_stat_init(&ctx->stat);
98	84.9k	ctx->stat_invalid = st_invalid;
99	84.9k	if (attributes != NULL) {
100	84.7k	(void)memcpy_s(&ctx->attributes, sizeof(ctx->attributes), attributes, sizeof(ctx->attributes));
101	84.7k	}
102	265	else {
103	265	zip_file_attributes_init(&ctx->attributes);
104	265	}
105	84.9k	if (dostime != NULL) {
106	84.7k	ctx->dostime = *dostime;
107	84.7k	ctx->dostime_valid = true;
108	84.7k	}
109	265	else {
110	265	ctx->dostime_valid = false;
111	265	}
112	84.9k	ctx->source_archive = source_archive;
113	84.9k	ctx->source_index = source_index;
114	84.9k	zip_error_init(&ctx->error);
115	84.9k	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));
116	84.9k	if (ctx->end_valid) {
117	84.9k	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_AT_EOF);
118	84.9k	}
119	84.9k	ctx->needs_seek = (ctx->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_SEEK)) ? true : false;
120
121	84.9k	if (st) {
122	84.9k	if (_zip_stat_merge(&ctx->stat, st, error) < 0) {
123	0	free(ctx);
124	0	return NULL;
125	0	}
126	84.9k	}
127
128	84.9k	window_source = zip_source_layered_create(src, window_read, ctx, error);
129	84.9k	if (window_source == NULL) {
130	0	free(ctx);
131	0	return NULL;
132	0	}
133	84.9k	if (!take_ownership) {
134	70.9k	zip_source_keep(src);
135	70.9k	}
136	84.9k	return window_source;
137	84.9k	}
138
139
140	84.7k	int _zip_source_set_source_archive(zip_source_t src, zip_t za) {
141	84.7k	src->source_archive = za;
142	84.7k	return _zip_register_source(za, src);
143	84.7k	}
144
145
146		/* called by zip_discard to avoid operating on file from closed archive */
147	0	void _zip_source_invalidate(zip_source_t *src) {
148	0	src->source_closed = 1;
149
150	0	if (zip_error_code_zip(&src->error) == ZIP_ER_OK) {
151	0	zip_error_set(&src->error, ZIP_ER_ZIPCLOSED, 0);
152	0	}
153	0	}
154
155
156	526k	static zip_int64_t window_read(zip_source_t src, void _ctx, void *data, zip_uint64_t len, zip_source_cmd_t cmd) {
157	526k	struct window *ctx;
158	526k	zip_int64_t ret;
159	526k	zip_uint64_t n, i;
160
161	526k	ctx = (struct window *)_ctx;
162
163	526k	switch (cmd) {
164	714	case ZIP_SOURCE_AT_EOF:
165	714	if (ctx->end_valid) {
166	714	return ctx->offset == ctx->end;
167	714	}
168	0	else {
169	0	return zip_source_pass_to_lower_layer(src, data, len, cmd);
170	0	}
171
172	41.1k	case ZIP_SOURCE_CLOSE:
173	41.1k	return 0;
174
175	45.2k	case ZIP_SOURCE_ERROR:
176	45.2k	return zip_error_to_data(&ctx->error, data, len);
177
178	84.9k	case ZIP_SOURCE_FREE:
179	84.9k	free(ctx);
180	84.9k	return 0;
181
182	76.8k	case ZIP_SOURCE_OPEN:
183	76.8k	if (ctx->source_archive) {
184	64.0k	zip_uint64_t offset;
185
186	64.0k	if ((offset = _zip_file_get_offset(ctx->source_archive, ctx->source_index, &ctx->error)) == 0) {
187	35.6k	return -1;
188	35.6k	}
189	28.3k	if (ctx->end_valid) {
190	28.3k	if (ctx->end + offset < ctx->end) {
191		/* zip archive data claims end of data past zip64 limits */
192	0	zip_error_set(&ctx->error, ZIP_ER_INCONS, MAKE_DETAIL_WITH_INDEX(ZIP_ER_DETAIL_CDIR_ENTRY_INVALID, ctx->source_index));
193	0	return -1;
194	0	}
195	28.3k	ctx->end += offset;
196	28.3k	}
197	28.3k	ctx->start += offset;
198	28.3k	ctx->source_archive = NULL;
199	28.3k	}
200
201	41.1k	if (!ctx->needs_seek) {
202	0	DEFINE_BYTE_ARRAY(b, BUFSIZE);
203
204	0	if (!byte_array_init(b, BUFSIZE)) {
205	0	zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
206	0	return -1;
207	0	}
208
209	0	for (n = 0; n < ctx->start; n += (zip_uint64_t)ret) {
210	0	i = (ctx->start - n > BUFSIZE ? BUFSIZE : ctx->start - n);
211	0	if ((ret = zip_source_read(src, b, i)) < 0) {
212	0	zip_error_set_from_source(&ctx->error, src);
213	0	byte_array_fini(b);
214	0	return -1;
215	0	}
216	0	if (ret == 0) {
217	0	zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
218	0	byte_array_fini(b);
219	0	return -1;
220	0	}
221	0	}
222
223	0	byte_array_fini(b);
224	0	}
225
226	41.1k	ctx->offset = ctx->start;
227	41.1k	return 0;
228
229	82.6k	case ZIP_SOURCE_READ:
230	82.6k	if (ctx->end_valid && len > ctx->end - ctx->offset) {
231	33.2k	len = ctx->end - ctx->offset;
232	33.2k	}
233
234	82.6k	if (len == 0) {
235	21.2k	return 0;
236	21.2k	}
237
238	61.4k	if (ctx->needs_seek) {
239	61.4k	if (zip_source_seek(src, (zip_int64_t)ctx->offset, SEEK_SET) < 0) {
240	1.81k	zip_error_set_from_source(&ctx->error, src);
241	1.81k	return -1;
242	1.81k	}
243	61.4k	}
244
245	59.6k	if ((ret = zip_source_read(src, data, len)) < 0) {
246	0	zip_error_set_from_source(&ctx->error, src);
247	0	return -1;
248	0	}
249
250	59.6k	if (ret == 0) {
251	7.71k	if (ctx->end_valid && ctx->offset < ctx->end) {
252	7.71k	zip_error_set(&ctx->error, ZIP_ER_EOF, 0);
253	7.71k	return -1;
254	7.71k	}
255	7.71k	}
256
257	51.9k	ctx->offset += (zip_uint64_t)ret;
258	51.9k	return ret;
259
260	0	case ZIP_SOURCE_SEEK: {
261	0	zip_uint64_t length;
262	0	zip_int64_t new_offset;
263	0	zip_source_args_seek_t *args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error);
264
265		/*
266		If we don't know the length and seek from the end, we seek in the lower source to get the new offset.
267		*/
268	0	if (!ctx->end_valid && args->whence == SEEK_END) {
269	0	zip_int64_t lower_offset;
270
271	0	if (zip_source_seek(src, args->offset, args->whence) < 0) {
272	0	zip_error_set_from_source(&ctx->error, src);
273	0	return -1;
274	0	}
275	0	if ((lower_offset = zip_source_tell(src)) < 0) {
276	0	zip_error_set_from_source(&ctx->error, src);
277	0	return -1;
278	0	}
279	0	if ((zip_uint64_t)lower_offset < ctx->start) {
280	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
281	0	return -1;
282	0	}
283	0	ctx->offset = (zip_uint64_t)lower_offset;
284	0	return 0;
285	0	}
286
287		/*
288		If we don't know the length, we disable the end check in zip_source_seek_compute_offset by passing in the largest possible value and seek in the lower source to validate the new offset.
289		*/
290	0	length = ctx->end_valid ? (ctx->end - ctx->start) : ZIP_INT64_MAX;
291	0	new_offset = zip_source_seek_compute_offset(ctx->offset - ctx->start, length, data, len, &ctx->error);
292
293	0	if (new_offset < 0) {
294	0	return -1;
295	0	}
296
297	0	if (new_offset + ctx->start < ctx->start) {
298	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
299	0	return -1;
300	0	}
301	0	new_offset += ctx->start;
302
303	0	if (!ctx->end_valid) {
304	0	if (zip_source_seek(src, new_offset, SEEK_SET) < 0) {
305	0	zip_error_set_from_source(&ctx->error, src);
306	0	return -1;
307	0	}
308	0	}
309	0	ctx->offset = (zip_uint64_t)new_offset;
310	0	return 0;
311	0	}
312
313	84.0k	case ZIP_SOURCE_STAT: {
314	84.0k	zip_stat_t *st;
315
316	84.0k	st = (zip_stat_t *)data;
317
318	84.0k	if (_zip_stat_merge(st, &ctx->stat, &ctx->error) < 0) {
319	0	return -1;
320	0	}
321
322	84.0k	if (!(ctx->stat.valid & ZIP_STAT_SIZE)) {
323	0	if (ctx->end_valid) {
324	0	st->valid \|= ZIP_STAT_SIZE;
325	0	st->size = ctx->end - ctx->start;
326	0	}
327	0	else if (st->valid & ZIP_STAT_SIZE) {
328	0	st->size -= ctx->start;
329	0	}
330	0	}
331
332	84.0k	st->valid &= ~ctx->stat_invalid;
333
334	84.0k	return 0;
335	84.0k	}
336
337	21.7k	case ZIP_SOURCE_GET_FILE_ATTRIBUTES:
338	21.7k	if (len < sizeof(ctx->attributes)) {
339	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
340	0	return -1;
341	0	}
342
343	21.7k	(void)memcpy_s(data, sizeof(ctx->attributes), &ctx->attributes, sizeof(ctx->attributes));
344	21.7k	return sizeof(ctx->attributes);
345
346	4.59k	case ZIP_SOURCE_GET_DOS_TIME:
347	4.59k	if (len < sizeof(ctx->dostime)) {
348	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
349	0	return -1;
350	0	}
351	4.59k	if (ctx->dostime_valid) {
352	4.59k	(void)memcpy_s(data, sizeof(ctx->dostime), &ctx->dostime, sizeof(ctx->dostime));
353	4.59k	return sizeof(ctx->dostime);
354	4.59k	}
355	0	else {
356	0	return 0;
357	0	}
358
359	84.9k	case ZIP_SOURCE_SUPPORTS:
360	84.9k	return ctx->supports;
361
362	0	case ZIP_SOURCE_TELL:
363	0	return (zip_int64_t)(ctx->offset - ctx->start);
364
365	0	default:
366	0	return zip_source_pass_to_lower_layer(src, data, len, cmd);
367	526k	}
368	526k	}
369
370
371	84.7k	void _zip_deregister_source(zip_t za, zip_source_t src) {
372	84.7k	zip_uint64_t i;
373
374	84.7k	for (i = 0; i < za->nopen_source; i++) {
375	84.7k	if (za->open_source[i] == src) {
376	84.7k	za->open_source[i] = za->open_source[za->nopen_source - 1];
377	84.7k	za->nopen_source--;
378	84.7k	break;
379	84.7k	}
380	84.7k	}
381	84.7k	}
382
383
384	84.7k	int _zip_register_source(zip_t za, zip_source_t src) {
385	84.7k	if (za->nopen_source + 1 >= za->nopen_source_alloc) {
386	6.01k	if (!ZIP_REALLOC(za->open_source, za->nopen_source_alloc, 10, &za->error)) {
387	0	return -1;
388	0	}
389	6.01k	}
390
391	84.7k	za->open_source[za->nopen_source++] = src;
392
393	84.7k	return 0;
394	84.7k	}