/src/libzip/lib/zip_source_file_common.c

Source (jump to first uncovered line)
/*
  zip_source_file_common.c -- create data source from file
  Copyright (C) 1999-2023 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 <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "zipint.h"

#include "zip_source_file.h"

static zip_int64_t read_file(void *state, void *data, zip_uint64_t len, zip_source_cmd_t cmd);

static void
zip_source_file_stat_init(zip_source_file_stat_t *st) {
    st->size = 0;
    st->mtime = time(NULL);
    st->exists = false;
    st->regular_file = false;
}

zip_source_t *
zip_source_file_common_new(const char *fname, void *file, zip_uint64_t start, zip_int64_t len, const zip_stat_t *st, zip_source_file_operations_t *ops, void *ops_userdata, zip_error_t *error) {
    zip_source_file_context_t *ctx;
    zip_source_t *zs;
    zip_source_file_stat_t sb;
    zip_uint64_t length;

    if (ops == NULL) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return NULL;
    }

    if (ops->close == NULL || ops->read == NULL || ops->seek == NULL || ops->stat == NULL) {
        zip_error_set(error, ZIP_ER_INTERNAL, 0);
        return NULL;
    }

    if (ops->write != NULL && (ops->commit_write == NULL || ops->create_temp_output == NULL || ops->remove == NULL || ops->rollback_write == NULL || ops->tell == NULL)) {
        zip_error_set(error, ZIP_ER_INTERNAL, 0);
        return NULL;
    }

    if (fname != NULL) {
        if (ops->open == NULL || ops->string_duplicate == NULL) {
            zip_error_set(error, ZIP_ER_INTERNAL, 0);
            return NULL;
        }
    }
    else if (file == NULL) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return NULL;
    }

    if (len < 0) {
        if (len == -1) {
            len = ZIP_LENGTH_TO_END;
        }
        // TODO: return ZIP_ER_INVAL if len != ZIP_LENGTH_UNCHECKED?
        length = 0;
    }
    else {
        length = (zip_uint64_t)len;
    }

    if (start > ZIP_INT64_MAX || start + length < start) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return NULL;
    }

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

    ctx->ops = ops;
    ctx->ops_userdata = ops_userdata;
    ctx->fname = NULL;
    if (fname) {
        if ((ctx->fname = ops->string_duplicate(ctx, fname)) == NULL) {
            zip_error_set(error, ZIP_ER_MEMORY, 0);
            free(ctx);
            return NULL;
        }
    }
    ctx->f = file;
    ctx->start = start;
    ctx->len = length;
    if (st) {
        (void)memcpy_s(&ctx->st, sizeof(ctx->st), st, sizeof(*st));
        ctx->st.name = NULL;
        ctx->st.valid &= ~ZIP_STAT_NAME;
    }
    else {
        zip_stat_init(&ctx->st);
    }

    if (ctx->len > 0) {
        ctx->st.size = ctx->len;
        ctx->st.valid |= ZIP_STAT_SIZE;
    }

    zip_error_init(&ctx->stat_error);

    ctx->tmpname = NULL;
    ctx->fout = NULL;

    zip_error_init(&ctx->error);
    zip_file_attributes_init(&ctx->attributes);

    ctx->supports = ZIP_SOURCE_SUPPORTS_READABLE | zip_source_make_command_bitmap(ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_TELL, ZIP_SOURCE_SUPPORTS_REOPEN, -1);

    zip_source_file_stat_init(&sb);
    if (!ops->stat(ctx, &sb)) {
        _zip_error_copy(error, &ctx->error);
        free(ctx->fname);
        free(ctx);
        return NULL;
    }

    if (!sb.exists) {
        if (ctx->fname && ctx->start == 0 && ctx->len == 0 && ops->write != NULL) {
            ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
            /* zip_open_from_source checks for this to detect non-existing files */
            zip_error_set(&ctx->stat_error, ZIP_ER_READ, ENOENT);
        }
        else {
            zip_error_set(&ctx->stat_error, ZIP_ER_READ, ENOENT);
            free(ctx->fname);
            free(ctx);
            return NULL;
        }
    }
    else {
        if ((ctx->st.valid & ZIP_STAT_MTIME) == 0) {
            ctx->st.mtime = sb.mtime;
            ctx->st.valid |= ZIP_STAT_MTIME;
        }
        if (sb.regular_file) {
            ctx->supports = ZIP_SOURCE_SUPPORTS_SEEKABLE;

            if (ctx->start + ctx->len > sb.size) {
                zip_error_set(error, ZIP_ER_INVAL, 0);
                free(ctx->fname);
                free(ctx);
                return NULL;
            }

            if (ctx->len == 0) {
                if (len != ZIP_LENGTH_UNCHECKED) {
                    ctx->len = sb.size - ctx->start;
                    ctx->st.size = ctx->len;
                    ctx->st.valid |= ZIP_STAT_SIZE;
                }

                /* when using a partial file, don't allow writing */
                if (ctx->fname && start == 0 && ops->write != NULL) {
                    ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
                }
            }
        }

        ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_GET_FILE_ATTRIBUTES);
    }

    ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_ACCEPT_EMPTY);
    if (ops->create_temp_output_cloning != NULL) {
        if (ctx->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE)) {
            ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE_CLONING);
        }
    }

    if ((zs = zip_source_function_create(read_file, ctx, error)) == NULL) {
        free(ctx->fname);
        free(ctx);
        return NULL;
    }

    return zs;
}


static zip_int64_t
read_file(void *state, void *data, zip_uint64_t len, zip_source_cmd_t cmd) {
    zip_source_file_context_t *ctx;
    char *buf;

    ctx = (zip_source_file_context_t *)state;
    buf = (char *)data;

    switch (cmd) {
    case ZIP_SOURCE_ACCEPT_EMPTY:
        return 0;

    case ZIP_SOURCE_BEGIN_WRITE:
        /* write support should not be set if fname is NULL */
        if (ctx->fname == NULL) {
            zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
            return -1;
        }
        return ctx->ops->create_temp_output(ctx);

    case ZIP_SOURCE_BEGIN_WRITE_CLONING:
        /* write support should not be set if fname is NULL */
        if (ctx->fname == NULL) {
            zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
            return -1;
        }
        return ctx->ops->create_temp_output_cloning(ctx, len);

    case ZIP_SOURCE_CLOSE:
        if (ctx->fname) {
            ctx->ops->close(ctx);
            ctx->f = NULL;
        }
        return 0;

    case ZIP_SOURCE_COMMIT_WRITE: {
        zip_int64_t ret = ctx->ops->commit_write(ctx);
        ctx->fout = NULL;
        if (ret == 0) {
            free(ctx->tmpname);
            ctx->tmpname = NULL;
        }
        return ret;
    }

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

    case ZIP_SOURCE_FREE:
        free(ctx->fname);
        free(ctx->tmpname);
        if (ctx->f) {
            ctx->ops->close(ctx);
        }
        free(ctx);
        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_OPEN:
        if (ctx->fname) {
            if (ctx->ops->open(ctx) == false) {
                return -1;
            }
        }

        if (ctx->start > 0) { /* TODO: rewind on re-open */
            if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)ctx->start, SEEK_SET) == false) {
                /* TODO: skip by reading */
                return -1;
            }
        }
        ctx->offset = 0;
        return 0;

    case ZIP_SOURCE_READ: {
        zip_int64_t i;
        zip_uint64_t n;

        if (ctx->len > 0) {
            n = ZIP_MIN(ctx->len - ctx->offset, len);
        }
        else {
            n = len;
        }

        if ((i = ctx->ops->read(ctx, buf, n)) < 0) {
            zip_error_set(&ctx->error, ZIP_ER_READ, errno);
            return -1;
        }
        ctx->offset += (zip_uint64_t)i;

        return i;
    }

    case ZIP_SOURCE_REMOVE:
        return ctx->ops->remove(ctx);

    case ZIP_SOURCE_ROLLBACK_WRITE:
        ctx->ops->rollback_write(ctx);
        ctx->fout = NULL;
        free(ctx->tmpname);
        ctx->tmpname = NULL;
        return 0;

    case ZIP_SOURCE_SEEK: {
        zip_int64_t new_offset = zip_source_seek_compute_offset(ctx->offset, ctx->len, data, len, &ctx->error);

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

        /* The actual offset inside the file must be representable as zip_int64_t. */
        if (new_offset > ZIP_INT64_MAX - (zip_int64_t)ctx->start) {
            zip_error_set(&ctx->error, ZIP_ER_SEEK, EOVERFLOW);
            return -1;
        }

        ctx->offset = (zip_uint64_t)new_offset;

        if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)(ctx->offset + ctx->start), SEEK_SET) == false) {
            return -1;
        }
        return 0;
    }

    case ZIP_SOURCE_SEEK_WRITE: {
        zip_source_args_seek_t *args;

        args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error);
        if (args == NULL) {
            return -1;
        }

        if (ctx->ops->seek(ctx, ctx->fout, args->offset, args->whence) == false) {
            return -1;
        }
        return 0;
    }

    case ZIP_SOURCE_STAT: {
        if (len < sizeof(ctx->st))
            return -1;

        if (zip_error_code_zip(&ctx->stat_error) != 0) {
            zip_error_set(&ctx->error, zip_error_code_zip(&ctx->stat_error), zip_error_code_system(&ctx->stat_error));
            return -1;
        }

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

    case ZIP_SOURCE_SUPPORTS:
        return ctx->supports;

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

    case ZIP_SOURCE_TELL_WRITE:
        return ctx->ops->tell(ctx, ctx->fout);

    case ZIP_SOURCE_WRITE:
        return ctx->ops->write(ctx, data, len);

    default:
        zip_error_set(&ctx->error, ZIP_ER_OPNOTSUPP, 0);
        return -1;
    }
}

Coverage Report

Created: 2025-07-23 08:18

Line	Count	Source (jump to first uncovered line)
1		/*
2		zip_source_file_common.c -- create data source from file
3		Copyright (C) 1999-2023 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 <stdio.h>
35		#include <stdlib.h>
36		#include <string.h>
37
38		#include "zipint.h"
39
40		#include "zip_source_file.h"
41
42		static zip_int64_t read_file(void state, void data, zip_uint64_t len, zip_source_cmd_t cmd);
43
44		static void
45	23	zip_source_file_stat_init(zip_source_file_stat_t *st) {
46	23	st->size = 0;
47	23	st->mtime = time(NULL);
48	23	st->exists = false;
49	23	st->regular_file = false;
50	23	}
51
52		zip_source_t *
53	23	zip_source_file_common_new(const char fname, void file, zip_uint64_t start, zip_int64_t len, const zip_stat_t st, zip_source_file_operations_t ops, void ops_userdata, zip_error_t error) {
54	23	zip_source_file_context_t *ctx;
55	23	zip_source_t *zs;
56	23	zip_source_file_stat_t sb;
57	23	zip_uint64_t length;
58
59	23	if (ops == NULL) {
60	0	zip_error_set(error, ZIP_ER_INVAL, 0);
61	0	return NULL;
62	0	}
63
64	23	if (ops->close == NULL \|\| ops->read == NULL \|\| ops->seek == NULL \|\| ops->stat == NULL) {
65	0	zip_error_set(error, ZIP_ER_INTERNAL, 0);
66	0	return NULL;
67	0	}
68
69	23	if (ops->write != NULL && (ops->commit_write == NULL \|\| ops->create_temp_output == NULL \|\| ops->remove == NULL \|\| ops->rollback_write == NULL \|\| ops->tell == NULL)) {
70	0	zip_error_set(error, ZIP_ER_INTERNAL, 0);
71	0	return NULL;
72	0	}
73
74	23	if (fname != NULL) {
75	23	if (ops->open == NULL \|\| ops->string_duplicate == NULL) {
76	0	zip_error_set(error, ZIP_ER_INTERNAL, 0);
77	0	return NULL;
78	0	}
79	23	}
80	0	else if (file == NULL) {
81	0	zip_error_set(error, ZIP_ER_INVAL, 0);
82	0	return NULL;
83	0	}
84
85	23	if (len < 0) {
86	23	if (len == -1) {
87	23	len = ZIP_LENGTH_TO_END;
88	23	}
89		// TODO: return ZIP_ER_INVAL if len != ZIP_LENGTH_UNCHECKED?
90	23	length = 0;
91	23	}
92	0	else {
93	0	length = (zip_uint64_t)len;
94	0	}
95
96	23	if (start > ZIP_INT64_MAX \|\| start + length < start) {
97	0	zip_error_set(error, ZIP_ER_INVAL, 0);
98	0	return NULL;
99	0	}
100
101	23	if ((ctx = (zip_source_file_context_t *)malloc(sizeof(zip_source_file_context_t))) == NULL) {
102	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
103	0	return NULL;
104	0	}
105
106	23	ctx->ops = ops;
107	23	ctx->ops_userdata = ops_userdata;
108	23	ctx->fname = NULL;
109	23	if (fname) {
110	23	if ((ctx->fname = ops->string_duplicate(ctx, fname)) == NULL) {
111	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
112	0	free(ctx);
113	0	return NULL;
114	0	}
115	23	}
116	23	ctx->f = file;
117	23	ctx->start = start;
118	23	ctx->len = length;
119	23	if (st) {
120	0	(void)memcpy_s(&ctx->st, sizeof(ctx->st), st, sizeof(*st));
121	0	ctx->st.name = NULL;
122	0	ctx->st.valid &= ~ZIP_STAT_NAME;
123	0	}
124	23	else {
125	23	zip_stat_init(&ctx->st);
126	23	}
127
128	23	if (ctx->len > 0) {
129	0	ctx->st.size = ctx->len;
130	0	ctx->st.valid \|= ZIP_STAT_SIZE;
131	0	}
132
133	23	zip_error_init(&ctx->stat_error);
134
135	23	ctx->tmpname = NULL;
136	23	ctx->fout = NULL;
137
138	23	zip_error_init(&ctx->error);
139	23	zip_file_attributes_init(&ctx->attributes);
140
141	23	ctx->supports = ZIP_SOURCE_SUPPORTS_READABLE \| zip_source_make_command_bitmap(ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_TELL, ZIP_SOURCE_SUPPORTS_REOPEN, -1);
142
143	23	zip_source_file_stat_init(&sb);
144	23	if (!ops->stat(ctx, &sb)) {
145	0	_zip_error_copy(error, &ctx->error);
146	0	free(ctx->fname);
147	0	free(ctx);
148	0	return NULL;
149	0	}
150
151	23	if (!sb.exists) {
152	23	if (ctx->fname && ctx->start == 0 && ctx->len == 0 && ops->write != NULL) {
153	23	ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
154		/* zip_open_from_source checks for this to detect non-existing files */
155	23	zip_error_set(&ctx->stat_error, ZIP_ER_READ, ENOENT);
156	23	}
157	0	else {
158	0	zip_error_set(&ctx->stat_error, ZIP_ER_READ, ENOENT);
159	0	free(ctx->fname);
160	0	free(ctx);
161	0	return NULL;
162	0	}
163	23	}
164	0	else {
165	0	if ((ctx->st.valid & ZIP_STAT_MTIME) == 0) {
166	0	ctx->st.mtime = sb.mtime;
167	0	ctx->st.valid \|= ZIP_STAT_MTIME;
168	0	}
169	0	if (sb.regular_file) {
170	0	ctx->supports = ZIP_SOURCE_SUPPORTS_SEEKABLE;
171
172	0	if (ctx->start + ctx->len > sb.size) {
173	0	zip_error_set(error, ZIP_ER_INVAL, 0);
174	0	free(ctx->fname);
175	0	free(ctx);
176	0	return NULL;
177	0	}
178
179	0	if (ctx->len == 0) {
180	0	if (len != ZIP_LENGTH_UNCHECKED) {
181	0	ctx->len = sb.size - ctx->start;
182	0	ctx->st.size = ctx->len;
183	0	ctx->st.valid \|= ZIP_STAT_SIZE;
184	0	}
185
186		/* when using a partial file, don't allow writing */
187	0	if (ctx->fname && start == 0 && ops->write != NULL) {
188	0	ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
189	0	}
190	0	}
191	0	}
192
193	0	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_GET_FILE_ATTRIBUTES);
194	0	}
195
196	23	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_ACCEPT_EMPTY);
197	23	if (ops->create_temp_output_cloning != NULL) {
198	23	if (ctx->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE)) {
199	23	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE_CLONING);
200	23	}
201	23	}
202
203	23	if ((zs = zip_source_function_create(read_file, ctx, error)) == NULL) {
204	0	free(ctx->fname);
205	0	free(ctx);
206	0	return NULL;
207	0	}
208
209	23	return zs;
210	23	}
211
212
213		static zip_int64_t
214	92	read_file(void state, void data, zip_uint64_t len, zip_source_cmd_t cmd) {
215	92	zip_source_file_context_t *ctx;
216	92	char *buf;
217
218	92	ctx = (zip_source_file_context_t *)state;
219	92	buf = (char *)data;
220
221	92	switch (cmd) {
222	0	case ZIP_SOURCE_ACCEPT_EMPTY:
223	0	return 0;
224
225	0	case ZIP_SOURCE_BEGIN_WRITE:
226		/* write support should not be set if fname is NULL */
227	0	if (ctx->fname == NULL) {
228	0	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
229	0	return -1;
230	0	}
231	0	return ctx->ops->create_temp_output(ctx);
232
233	0	case ZIP_SOURCE_BEGIN_WRITE_CLONING:
234		/* write support should not be set if fname is NULL */
235	0	if (ctx->fname == NULL) {
236	0	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
237	0	return -1;
238	0	}
239	0	return ctx->ops->create_temp_output_cloning(ctx, len);
240
241	0	case ZIP_SOURCE_CLOSE:
242	0	if (ctx->fname) {
243	0	ctx->ops->close(ctx);
244	0	ctx->f = NULL;
245	0	}
246	0	return 0;
247
248	0	case ZIP_SOURCE_COMMIT_WRITE: {
249	0	zip_int64_t ret = ctx->ops->commit_write(ctx);
250	0	ctx->fout = NULL;
251	0	if (ret == 0) {
252	0	free(ctx->tmpname);
253	0	ctx->tmpname = NULL;
254	0	}
255	0	return ret;
256	0	}
257
258	23	case ZIP_SOURCE_ERROR:
259	23	return zip_error_to_data(&ctx->error, data, len);
260
261	23	case ZIP_SOURCE_FREE:
262	23	free(ctx->fname);
263	23	free(ctx->tmpname);
264	23	if (ctx->f) {
265	0	ctx->ops->close(ctx);
266	0	}
267	23	free(ctx);
268	23	return 0;
269
270	0	case ZIP_SOURCE_GET_FILE_ATTRIBUTES:
271	0	if (len < sizeof(ctx->attributes)) {
272	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
273	0	return -1;
274	0	}
275	0	(void)memcpy_s(data, sizeof(ctx->attributes), &ctx->attributes, sizeof(ctx->attributes));
276	0	return sizeof(ctx->attributes);
277
278	0	case ZIP_SOURCE_OPEN:
279	0	if (ctx->fname) {
280	0	if (ctx->ops->open(ctx) == false) {
281	0	return -1;
282	0	}
283	0	}
284
285	0	if (ctx->start > 0) { /* TODO: rewind on re-open */
286	0	if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)ctx->start, SEEK_SET) == false) {
287		/* TODO: skip by reading */
288	0	return -1;
289	0	}
290	0	}
291	0	ctx->offset = 0;
292	0	return 0;
293
294	0	case ZIP_SOURCE_READ: {
295	0	zip_int64_t i;
296	0	zip_uint64_t n;
297
298	0	if (ctx->len > 0) {
299	0	n = ZIP_MIN(ctx->len - ctx->offset, len);
300	0	}
301	0	else {
302	0	n = len;
303	0	}
304
305	0	if ((i = ctx->ops->read(ctx, buf, n)) < 0) {
306	0	zip_error_set(&ctx->error, ZIP_ER_READ, errno);
307	0	return -1;
308	0	}
309	0	ctx->offset += (zip_uint64_t)i;
310
311	0	return i;
312	0	}
313
314	0	case ZIP_SOURCE_REMOVE:
315	0	return ctx->ops->remove(ctx);
316
317	0	case ZIP_SOURCE_ROLLBACK_WRITE:
318	0	ctx->ops->rollback_write(ctx);
319	0	ctx->fout = NULL;
320	0	free(ctx->tmpname);
321	0	ctx->tmpname = NULL;
322	0	return 0;
323
324	0	case ZIP_SOURCE_SEEK: {
325	0	zip_int64_t new_offset = zip_source_seek_compute_offset(ctx->offset, ctx->len, data, len, &ctx->error);
326
327	0	if (new_offset < 0) {
328	0	return -1;
329	0	}
330
331		/* The actual offset inside the file must be representable as zip_int64_t. */
332	0	if (new_offset > ZIP_INT64_MAX - (zip_int64_t)ctx->start) {
333	0	zip_error_set(&ctx->error, ZIP_ER_SEEK, EOVERFLOW);
334	0	return -1;
335	0	}
336
337	0	ctx->offset = (zip_uint64_t)new_offset;
338
339	0	if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)(ctx->offset + ctx->start), SEEK_SET) == false) {
340	0	return -1;
341	0	}
342	0	return 0;
343	0	}
344
345	0	case ZIP_SOURCE_SEEK_WRITE: {
346	0	zip_source_args_seek_t *args;
347
348	0	args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error);
349	0	if (args == NULL) {
350	0	return -1;
351	0	}
352
353	0	if (ctx->ops->seek(ctx, ctx->fout, args->offset, args->whence) == false) {
354	0	return -1;
355	0	}
356	0	return 0;
357	0	}
358
359	23	case ZIP_SOURCE_STAT: {
360	23	if (len < sizeof(ctx->st))
361	0	return -1;
362
363	23	if (zip_error_code_zip(&ctx->stat_error) != 0) {
364	23	zip_error_set(&ctx->error, zip_error_code_zip(&ctx->stat_error), zip_error_code_system(&ctx->stat_error));
365	23	return -1;
366	23	}
367
368	0	(void)memcpy_s(data, sizeof(ctx->st), &ctx->st, sizeof(ctx->st));
369	0	return sizeof(ctx->st);
370	23	}
371
372	23	case ZIP_SOURCE_SUPPORTS:
373	23	return ctx->supports;
374
375	0	case ZIP_SOURCE_TELL:
376	0	return (zip_int64_t)ctx->offset;
377
378	0	case ZIP_SOURCE_TELL_WRITE:
379	0	return ctx->ops->tell(ctx, ctx->fout);
380
381	0	case ZIP_SOURCE_WRITE:
382	0	return ctx->ops->write(ctx, data, len);
383
384	0	default:
385	0	zip_error_set(&ctx->error, ZIP_ER_OPNOTSUPP, 0);
386	0	return -1;
387	92	}
388	92	}