/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: 2026-08-31 06:55

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	4.66k	static void zip_source_file_stat_init(zip_source_file_stat_t *st) {
45	4.66k	st->size = 0;
46	4.66k	st->mtime = time(NULL);
47	4.66k	st->exists = false;
48	4.66k	st->regular_file = false;
49	4.66k	}
50
51	4.66k	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	4.66k	zip_source_file_context_t *ctx;
53	4.66k	zip_source_t *zs;
54	4.66k	zip_source_file_stat_t sb;
55	4.66k	zip_uint64_t length;
56
57	4.66k	if (ops == NULL) {
58	0	zip_error_set(error, ZIP_ER_INVAL, 0);
59	0	return NULL;
60	0	}
61
62	4.66k	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	4.66k	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	4.66k	if (fname != NULL) {
73	4.66k	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	4.66k	}
78	0	else if (file == NULL) {
79	0	zip_error_set(error, ZIP_ER_INVAL, 0);
80	0	return NULL;
81	0	}
82
83	4.66k	if (len < 0) {
84	4.66k	if (len == -1) {
85	4.66k	len = ZIP_LENGTH_TO_END;
86	4.66k	}
87		// TODO: return ZIP_ER_INVAL if len != ZIP_LENGTH_UNCHECKED?
88	4.66k	length = 0;
89	4.66k	}
90	0	else {
91	0	length = (zip_uint64_t)len;
92	0	}
93
94	4.66k	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	4.66k	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	4.66k	ctx->ops = ops;
105	4.66k	ctx->ops_userdata = ops_userdata;
106	4.66k	ctx->fname = NULL;
107	4.66k	if (fname) {
108	4.66k	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	4.66k	}
114	4.66k	ctx->f = file;
115	4.66k	ctx->start = start;
116	4.66k	ctx->len = length;
117	4.66k	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	4.66k	else {
123	4.66k	zip_stat_init(&ctx->st);
124	4.66k	}
125
126	4.66k	if (ctx->len > 0) {
127	0	ctx->st.size = ctx->len;
128	0	ctx->st.valid \|= ZIP_STAT_SIZE;
129	0	}
130
131	4.66k	zip_error_init(&ctx->stat_error);
132
133	4.66k	ctx->tmpname = NULL;
134	4.66k	ctx->fout = NULL;
135
136	4.66k	zip_error_init(&ctx->error);
137	4.66k	zip_file_attributes_init(&ctx->attributes);
138
139	4.66k	ctx->supports = ZIP_SOURCE_SUPPORTS_READABLE \| zip_source_make_command_bitmap(ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_TELL, ZIP_SOURCE_SUPPORTS_REOPEN, -1);
140
141	4.66k	zip_source_file_stat_init(&sb);
142	4.66k	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	4.66k	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	4.66k	else {
163	4.66k	if ((ctx->st.valid & ZIP_STAT_MTIME) == 0) {
164	4.66k	ctx->st.mtime = sb.mtime;
165	4.66k	ctx->st.valid \|= ZIP_STAT_MTIME;
166	4.66k	}
167	4.66k	if (sb.regular_file) {
168	4.66k	ctx->supports = ZIP_SOURCE_SUPPORTS_SEEKABLE;
169
170	4.66k	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	4.66k	if (ctx->len == 0) {
178	4.66k	if (len != ZIP_LENGTH_UNCHECKED) {
179	4.66k	ctx->len = sb.size - ctx->start;
180	4.66k	ctx->st.size = ctx->len;
181	4.66k	ctx->st.valid \|= ZIP_STAT_SIZE;
182	4.66k	}
183
184		/* when using a partial file, don't allow writing */
185	4.66k	if (ctx->fname && start == 0 && ops->write != NULL) {
186	4.66k	ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
187	4.66k	}
188	4.66k	}
189	4.66k	}
190
191	4.66k	if (ctx->st.valid & ZIP_STAT_SIZE) {
192	4.66k	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_AT_EOF);
193	4.66k	}
194
195	4.66k	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_GET_FILE_ATTRIBUTES);
196	4.66k	}
197
198	4.66k	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_ACCEPT_EMPTY);
199	4.66k	if (ops->create_temp_output_cloning != NULL) {
200	4.66k	if (ctx->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE)) {
201	4.66k	ctx->supports \|= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE_CLONING);
202	4.66k	}
203	4.66k	}
204
205	4.66k	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	4.66k	return zs;
212	4.66k	}
213
214
215	227k	static zip_int64_t read_file(void state, void data, zip_uint64_t len, zip_source_cmd_t cmd) {
216	227k	zip_source_file_context_t *ctx;
217	227k	char *buf;
218
219	227k	ctx = (zip_source_file_context_t *)state;
220	227k	buf = (char *)data;
221
222	227k	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	4.66k	case ZIP_SOURCE_CLOSE:
254	4.66k	if (ctx->fname) {
255	4.66k	ctx->ops->close(ctx);
256	4.66k	ctx->f = NULL;
257	4.66k	}
258	4.66k	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	2.73k	case ZIP_SOURCE_ERROR:
271	2.73k	return zip_error_to_data(&ctx->error, data, len);
272
273	4.66k	case ZIP_SOURCE_FREE:
274	4.66k	free(ctx->fname);
275	4.66k	free(ctx->tmpname);
276	4.66k	if (ctx->f) {
277	0	ctx->ops->close(ctx);
278	0	}
279	4.66k	free(ctx);
280	4.66k	return 0;
281
282	6.12k	case ZIP_SOURCE_GET_FILE_ATTRIBUTES:
283	6.12k	if (len < sizeof(ctx->attributes)) {
284	0	zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
285	0	return -1;
286	0	}
287	6.12k	(void)memcpy_s(data, sizeof(ctx->attributes), &ctx->attributes, sizeof(ctx->attributes));
288	6.12k	return sizeof(ctx->attributes);
289
290	4.66k	case ZIP_SOURCE_OPEN:
291	4.66k	if (ctx->fname) {
292	4.66k	if (ctx->ops->open(ctx) == false) {
293	0	return -1;
294	0	}
295	4.66k	}
296
297	4.66k	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	4.66k	ctx->offset = 0;
304	4.66k	return 0;
305
306	126k	case ZIP_SOURCE_READ: {
307	126k	zip_int64_t i;
308	126k	zip_uint64_t n;
309
310	126k	if (ctx->len > 0) {
311	126k	n = ZIP_MIN(ctx->len - ctx->offset, len);
312	126k	}
313	0	else {
314	0	n = len;
315	0	}
316
317	126k	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	126k	ctx->offset += (zip_uint64_t)i;
322
323	126k	return i;
324	126k	}
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	47.9k	case ZIP_SOURCE_SEEK: {
337	47.9k	zip_int64_t new_offset = zip_source_seek_compute_offset(ctx->offset, ctx->len, data, len, &ctx->error);
338
339	47.9k	if (new_offset < 0) {
340	2.73k	return -1;
341	2.73k	}
342
343		/* The actual offset inside the file must be representable as zip_int64_t. */
344	45.2k	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	45.2k	ctx->offset = (zip_uint64_t)new_offset;
350
351	45.2k	if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)(ctx->offset + ctx->start), SEEK_SET) == false) {
352	0	return -1;
353	0	}
354	45.2k	return 0;
355	45.2k	}
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	20.8k	case ZIP_SOURCE_STAT: {
372	20.8k	if (len < sizeof(ctx->st)) {
373	0	return -1;
374	0	}
375
376	20.8k	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	20.8k	(void)memcpy_s(data, sizeof(ctx->st), &ctx->st, sizeof(ctx->st));
382	20.8k	return sizeof(ctx->st);
383	20.8k	}
384
385	4.66k	case ZIP_SOURCE_SUPPORTS:
386	4.66k	return ctx->supports;
387
388	4.77k	case ZIP_SOURCE_TELL:
389	4.77k	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	227k	}
401	227k	}