/src/libzip/lib/zip_source_file_common.c

Source
/*
  zip_source_file_common.c -- create data source from file
  Copyright (C) 1999-2025 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 <stdio.h>
#include <stdlib.h>
#include <string.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;
                }
            }
        }

        if (ctx->st.valid & ZIP_STAT_SIZE) {
            ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_AT_EOF);
        }

        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_AT_EOF:
        /* We only advertise support for ZIP_SOURCE_AT_EOF if ctx->len is valid. */
        return ctx->offset == ctx->len;

    case ZIP_SOURCE_BEGIN_WRITE: {
        zip_int64_t ret;
        /* 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;
        }
        ret = ctx->ops->create_temp_output(ctx);
        if (ret == 0) {
            /* Clear past error. Otherwise the error from zip_source_begin_write_cloning() will persist and be reported on zip_source_close(). */
            zip_error_set(&ctx->error, ZIP_ER_OK, 0);
        }
        return ret;
    }

    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: 2026-08-11 07:29

Line	Count	Source
1		/*
2		zip_source_file_common.c -- create data source from file
3		Copyright (C) 1999-2025 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 <stdio.h>
37		#include <stdlib.h>
38		#include <string.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	6.61k	static void zip_source_file_stat_init(zip_source_file_stat_t *st) {
45	6.61k	st->size = 0;
46	6.61k	st->mtime = time(NULL);
47	6.61k	st->exists = false;
48	6.61k	st->regular_file = false;
49	6.61k	}
50
51	6.61k	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) {
52	6.61k	zip_source_file_context_t *ctx;
53	6.61k	zip_source_t *zs;
54	6.61k	zip_source_file_stat_t sb;
55	6.61k	zip_uint64_t length;
56
57	6.61k	if (ops == NULL) {
58	0	zip_error_set(error, ZIP_ER_INVAL, 0);
59	0	return NULL;
60	0	}
61
62	6.61k	if (ops->close == NULL \|\| ops->read == NULL \|\| ops->seek == NULL \|\| ops->stat == NULL) {
63	0	zip_error_set(error, ZIP_ER_INTERNAL, 0);
64	0	return NULL;
65	0	}
66
67	6.61k	if (ops->write != NULL && (ops->commit_write == NULL \|\| ops->create_temp_output == NULL \|\| ops->remove == NULL \|\| ops->rollback_write == NULL \|\| ops->tell == NULL)) {
68	0	zip_error_set(error, ZIP_ER_INTERNAL, 0);
69	0	return NULL;
70	0	}
71
72	6.61k	if (fname != NULL) {
73	6.61k	if (ops->open == NULL \|\| ops->string_duplicate == NULL) {
74	0	zip_error_set(error, ZIP_ER_INTERNAL, 0);
75	0	return NULL;
76	0	}
77	6.61k	}
78	0	else if (file == NULL) {
79	0	zip_error_set(error, ZIP_ER_INVAL, 0);
80	0	return NULL;
81	0	}
82
83	6.61k	if (len < 0) {
84	6.61k	if (len == -1) {
85	6.61k	len = ZIP_LENGTH_TO_END;
86	6.61k	}
87		// TODO: return ZIP_ER_INVAL if len != ZIP_LENGTH_UNCHECKED?
88	6.61k	length = 0;
89	6.61k	}
90	0	else {
91	0	length = (zip_uint64_t)len;
92	0	}
93
94	6.61k	if (start > ZIP_INT64_MAX \|\| start + length < start) {
95	0	zip_error_set(error, ZIP_ER_INVAL, 0);
96	0	return NULL;
97	0	}
98
99	6.61k	if ((ctx = (zip_source_file_context_t *)malloc(sizeof(zip_source_file_context_t))) == NULL) {
100	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
101	0	return NULL;
102	0	}
103
104	6.61k	ctx->ops = ops;
105	6.61k	ctx->ops_userdata = ops_userdata;
106	6.61k	ctx->fname = NULL;
107	6.61k	if (fname) {
108	6.61k	if ((ctx->fname = ops->string_duplicate(ctx, fname)) == NULL) {
109	0	zip_error_set(error, ZIP_ER_MEMORY, 0);
110	0	free(ctx);
111	0	return NULL;
112	0	}
113	6.61k	}
114	6.61k	ctx->f = file;
115	6.61k	ctx->start = start;
116	6.61k	ctx->len = length;
117	6.61k	if (st) {
118	0	(void)memcpy_s(&ctx->st, sizeof(ctx->st), st, sizeof(*st));
119	0	ctx->st.name = NULL;
120	0	ctx->st.valid &= ~ZIP_STAT_NAME;
121	0	}
122	6.61k	else {
123	6.61k	zip_stat_init(&ctx->st);
124	6.61k	}
125
126	6.61k	if (ctx->len > 0) {
127	0	ctx->st.size = ctx->len;
128	0	ctx->st.valid \|= ZIP_STAT_SIZE;
129	0	}
130
131	6.61k	zip_error_init(&ctx->stat_error);
132
133	6.61k	ctx->tmpname = NULL;
134	6.61k	ctx->fout = NULL;
135
136	6.61k	zip_error_init(&ctx->error);
137	6.61k	zip_file_attributes_init(&ctx->attributes);
138
139	6.61k	ctx->supports = ZIP_SOURCE_SUPPORTS_READABLE \| zip_source_make_command_bitmap(ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_TELL, ZIP_SOURCE_SUPPORTS_REOPEN, -1);
140
141	6.61k	zip_source_file_stat_init(&sb);
142	6.61k	if (!ops->stat(ctx, &sb)) {
143	0	_zip_error_copy(error, &ctx->error);
144	0	free(ctx->fname);
145	0	free(ctx);
146	0	return NULL;
147	0	}
148
149	6.61k	if (!sb.exists) {
150	0	if (ctx->fname && ctx->start == 0 && ctx->len == 0 && ops->write != NULL) {
151	0	ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
152		/* zip_open_from_source checks for this to detect non-existing files */
153	0	zip_error_set(&ctx->stat_error, ZIP_ER_READ, ENOENT);
154	0	}
155	0	else {
156	0	zip_error_set(&ctx->stat_error, ZIP_ER_READ, ENOENT);
157	0	free(ctx->fname);
158	0	free(ctx);
159	0	return NULL;
160	0	}
161	0	}
162	6.61k	else {
163	6.61k	if ((ctx->st.valid & ZIP_STAT_MTIME) == 0) {
164	6.61k	ctx->st.mtime = sb.mtime;
165	6.61k	ctx->st.valid \|= ZIP_STAT_MTIME;
166	6.61k	}
167	6.61k	if (sb.regular_file) {
168	6.61k	ctx->supports = ZIP_SOURCE_SUPPORTS_SEEKABLE;
169
170	6.61k	if (ctx->start + ctx->len > sb.size) {
171	0	zip_error_set(error, ZIP_ER_INVAL, 0);
172	0	free(ctx->fname);
173	0	free(ctx);
174	0	return NULL;
175	0	}
176
177	6.61k	if (ctx->len == 0) {
178	6.61k	if (len != ZIP_LENGTH_UNCHECKED) {
179	6.61k	ctx->len = sb.size - ctx->start;
180	6.61k	ctx->st.size = ctx->len;
181	6.61k	ctx->st.valid \|= ZIP_STAT_SIZE;
182	6.61k	}
183
184		/* when using a partial file, don't allow writing */
185	6.61k	if (ctx->fname && start == 0 && ops->write != NULL) {
186	6.61k	ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
187	6.61k	}
188	6.61k	}
189	6.61k	}
190
191	6.61k	if (ctx->st.valid & ZIP_STAT_SIZE) {
192	6.61k	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_AT_EOF);
193	6.61k	}
194
195	6.61k	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_GET_FILE_ATTRIBUTES);
196	6.61k	}
197
198	6.61k	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_ACCEPT_EMPTY);
199	6.61k	if (ops->create_temp_output_cloning != NULL) {
200	6.61k	if (ctx->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE)) {
201	6.61k	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE_CLONING);
202	6.61k	}
203	6.61k	}
204
205	6.61k	if ((zs = zip_source_function_create(read_file, ctx, error)) == NULL) {
206	0	free(ctx->fname);
207	0	free(ctx);
208	0	return NULL;
209	0	}
210
211	6.61k	return zs;
212	6.61k	}
213
214
215	130k	static zip_int64_t read_file(void state, void data, zip_uint64_t len, zip_source_cmd_t cmd) {
216	130k	zip_source_file_context_t *ctx;
217	130k	char *buf;
218
219	130k	ctx = (zip_source_file_context_t *)state;
220	130k	buf = (char *)data;
221
222	130k	switch (cmd) {
223	0	case ZIP_SOURCE_ACCEPT_EMPTY:
224	0	return 0;
225
226	0	case ZIP_SOURCE_AT_EOF:
227		/* We only advertise support for ZIP_SOURCE_AT_EOF if ctx->len is valid. */
228	0	return ctx->offset == ctx->len;
229
230	0	case ZIP_SOURCE_BEGIN_WRITE: {
231	0	zip_int64_t ret;
232		/* write support should not be set if fname is NULL */
233	0	if (ctx->fname == NULL) {
234	0	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
235	0	return -1;
236	0	}
237	0	ret = ctx->ops->create_temp_output(ctx);
238	0	if (ret == 0) {
239		/* Clear past error. Otherwise the error from zip_source_begin_write_cloning() will persist and be reported on zip_source_close(). */
240	0	zip_error_set(&ctx->error, ZIP_ER_OK, 0);
241	0	}
242	0	return ret;
243	0	}
244
245	0	case ZIP_SOURCE_BEGIN_WRITE_CLONING:
246		/* write support should not be set if fname is NULL */
247	0	if (ctx->fname == NULL) {
248	0	zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
249	0	return -1;
250	0	}
251	0	return ctx->ops->create_temp_output_cloning(ctx, len);
252
253	6.61k	case ZIP_SOURCE_CLOSE:
254	6.61k	if (ctx->fname) {
255	6.61k	ctx->ops->close(ctx);
256	6.61k	ctx->f = NULL;
257	6.61k	}
258	6.61k	return 0;
259
260	0	case ZIP_SOURCE_COMMIT_WRITE: {
261	0	zip_int64_t ret = ctx->ops->commit_write(ctx);
262	0	ctx->fout = NULL;
263	0	if (ret == 0) {
264	0	free(ctx->tmpname);
265	0	ctx->tmpname = NULL;
266	0	}
267	0	return ret;
268	0	}
269
270	249	case ZIP_SOURCE_ERROR:
271	249	return zip_error_to_data(&ctx->error, data, len);
272
273	6.61k	case ZIP_SOURCE_FREE:
274	6.61k	free(ctx->fname);
275	6.61k	free(ctx->tmpname);
276	6.61k	if (ctx->f) {
277	0	ctx->ops->close(ctx);
278	0	}
279	6.61k	free(ctx);
280	6.61k	return 0;
281
282	6.70k	case ZIP_SOURCE_GET_FILE_ATTRIBUTES:
283	6.70k	if (len < sizeof(ctx->attributes)) {
284	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
285	0	return -1;
286	0	}
287	6.70k	(void)memcpy_s(data, sizeof(ctx->attributes), &ctx->attributes, sizeof(ctx->attributes));
288	6.70k	return sizeof(ctx->attributes);
289
290	6.61k	case ZIP_SOURCE_OPEN:
291	6.61k	if (ctx->fname) {
292	6.61k	if (ctx->ops->open(ctx) == false) {
293	0	return -1;
294	0	}
295	6.61k	}
296
297	6.61k	if (ctx->start > 0) { /* TODO: rewind on re-open */
298	0	if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)ctx->start, SEEK_SET) == false) {
299		/* TODO: skip by reading */
300	0	return -1;
301	0	}
302	0	}
303	6.61k	ctx->offset = 0;
304	6.61k	return 0;
305
306	33.3k	case ZIP_SOURCE_READ: {
307	33.3k	zip_int64_t i;
308	33.3k	zip_uint64_t n;
309
310	33.3k	if (ctx->len > 0) {
311	33.3k	n = ZIP_MIN(ctx->len - ctx->offset, len);
312	33.3k	}
313	0	else {
314	0	n = len;
315	0	}
316
317	33.3k	if ((i = ctx->ops->read(ctx, buf, n)) < 0) {
318	0	zip_error_set(&ctx->error, ZIP_ER_READ, errno);
319	0	return -1;
320	0	}
321	33.3k	ctx->offset += (zip_uint64_t)i;
322
323	33.3k	return i;
324	33.3k	}
325
326	0	case ZIP_SOURCE_REMOVE:
327	0	return ctx->ops->remove(ctx);
328
329	0	case ZIP_SOURCE_ROLLBACK_WRITE:
330	0	ctx->ops->rollback_write(ctx);
331	0	ctx->fout = NULL;
332	0	free(ctx->tmpname);
333	0	ctx->tmpname = NULL;
334	0	return 0;
335
336	29.0k	case ZIP_SOURCE_SEEK: {
337	29.0k	zip_int64_t new_offset = zip_source_seek_compute_offset(ctx->offset, ctx->len, data, len, &ctx->error);
338
339	29.0k	if (new_offset < 0) {
340	249	return -1;
341	249	}
342
343		/* The actual offset inside the file must be representable as zip_int64_t. */
344	28.8k	if (new_offset > ZIP_INT64_MAX - (zip_int64_t)ctx->start) {
345	0	zip_error_set(&ctx->error, ZIP_ER_SEEK, EOVERFLOW);
346	0	return -1;
347	0	}
348
349	28.8k	ctx->offset = (zip_uint64_t)new_offset;
350
351	28.8k	if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)(ctx->offset + ctx->start), SEEK_SET) == false) {
352	0	return -1;
353	0	}
354	28.8k	return 0;
355	28.8k	}
356
357	0	case ZIP_SOURCE_SEEK_WRITE: {
358	0	zip_source_args_seek_t *args;
359
360	0	args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error);
361	0	if (args == NULL) {
362	0	return -1;
363	0	}
364
365	0	if (ctx->ops->seek(ctx, ctx->fout, args->offset, args->whence) == false) {
366	0	return -1;
367	0	}
368	0	return 0;
369	0	}
370
371	27.6k	case ZIP_SOURCE_STAT: {
372	27.6k	if (len < sizeof(ctx->st)) {
373	0	return -1;
374	0	}
375
376	27.6k	if (zip_error_code_zip(&ctx->stat_error) != 0) {
377	0	zip_error_set(&ctx->error, zip_error_code_zip(&ctx->stat_error), zip_error_code_system(&ctx->stat_error));
378	0	return -1;
379	0	}
380
381	27.6k	(void)memcpy_s(data, sizeof(ctx->st), &ctx->st, sizeof(ctx->st));
382	27.6k	return sizeof(ctx->st);
383	27.6k	}
384
385	6.61k	case ZIP_SOURCE_SUPPORTS:
386	6.61k	return ctx->supports;
387
388	6.56k	case ZIP_SOURCE_TELL:
389	6.56k	return (zip_int64_t)ctx->offset;
390
391	0	case ZIP_SOURCE_TELL_WRITE:
392	0	return ctx->ops->tell(ctx, ctx->fout);
393
394	0	case ZIP_SOURCE_WRITE:
395	0	return ctx->ops->write(ctx, data, len);
396
397	0	default:
398	0	zip_error_set(&ctx->error, ZIP_ER_OPNOTSUPP, 0);
399	0	return -1;
400	130k	}
401	130k	}