/src/libzip/lib/zip_source_file_stdio_named.c

Source
/*
  zip_source_file_stdio_named.c -- source for stdio file opened by name
  Copyright (C) 1999-2024 Dieter Baron and Thomas Klausner

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

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

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

#include "zipint.h"

#include "zip_source_file.h"
#include "zip_source_file_stdio.h"

#include <fcntl.h>
#include <stdlib.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_CLONEFILE
#include <sys/attr.h>
#include <sys/clonefile.h>
#define CAN_CLONE
#endif
#ifdef HAVE_FICLONERANGE
#include <linux/fs.h>
#include <sys/ioctl.h>
#define CAN_CLONE
#endif

static bool copy_permissions(zip_source_file_context_t *ctx);
static int create_temp_file(zip_source_file_context_t *ctx, bool create_file);

static zip_int64_t _zip_stdio_op_commit_write(zip_source_file_context_t *ctx);
static zip_int64_t _zip_stdio_op_create_temp_output(zip_source_file_context_t *ctx);
#ifdef CAN_CLONE
static zip_int64_t _zip_stdio_op_create_temp_output_cloning(zip_source_file_context_t *ctx, zip_uint64_t offset);
#endif
static bool _zip_stdio_op_open(zip_source_file_context_t *ctx);
static zip_int64_t _zip_stdio_op_remove(zip_source_file_context_t *ctx);
static void _zip_stdio_op_rollback_write(zip_source_file_context_t *ctx);
static char *_zip_stdio_op_strdup(zip_source_file_context_t *ctx, const char *string);
static zip_int64_t _zip_stdio_op_write(zip_source_file_context_t *ctx, const void *data, zip_uint64_t len);
static FILE *_zip_fopen_close_on_exec(const char *name, bool writeable);

/* clang-format off */
static zip_source_file_operations_t ops_stdio_named = {
    _zip_stdio_op_close,
    _zip_stdio_op_commit_write,
    _zip_stdio_op_create_temp_output,
#ifdef CAN_CLONE
    _zip_stdio_op_create_temp_output_cloning,
#else
    NULL,
#endif
    _zip_stdio_op_open,
    _zip_stdio_op_read,
    _zip_stdio_op_remove,
    _zip_stdio_op_rollback_write,
    _zip_stdio_op_seek,
    _zip_stdio_op_stat,
    _zip_stdio_op_strdup,
    _zip_stdio_op_tell,
    _zip_stdio_op_write
};
/* clang-format on */

ZIP_EXTERN zip_source_t *zip_source_file(zip_t *za, const char *fname, zip_uint64_t start, zip_int64_t len) {
    if (za == NULL) {
        return NULL;
    }

    return zip_source_file_create(fname, start, len, &za->error);
}


ZIP_EXTERN zip_source_t *zip_source_file_create(const char *fname, zip_uint64_t start, zip_int64_t length, zip_error_t *error) {
    if (fname == NULL || length < ZIP_LENGTH_UNCHECKED) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return NULL;
    }

    return zip_source_file_common_new(fname, NULL, start, length, NULL, &ops_stdio_named, NULL, error);
}


static zip_int64_t _zip_stdio_op_commit_write(zip_source_file_context_t *ctx) {
    if (fclose(ctx->fout) < 0) {
        zip_error_set(&ctx->error, ZIP_ER_WRITE, errno);
        return -1;
    }
    if (!ctx->temp_output_created) {
        if (!copy_permissions(ctx)) {
            return -1;
        }
    }
    if (rename(ctx->tmpname, ctx->fname) < 0) {
        zip_error_set(&ctx->error, ZIP_ER_RENAME, errno);
        return -1;
    }

    return 0;
}


static zip_int64_t _zip_stdio_op_create_temp_output(zip_source_file_context_t *ctx) {
    int fd = create_temp_file(ctx, true);

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

    if ((ctx->fout = fdopen(fd, "r+b")) == NULL) {
        zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
        close(fd);
        (void)remove(ctx->tmpname);
        free(ctx->tmpname);
        ctx->tmpname = NULL;
        return -1;
    }

    return 0;
}

#ifdef CAN_CLONE
static zip_int64_t _zip_stdio_op_create_temp_output_cloning(zip_source_file_context_t *ctx, zip_uint64_t offset) {
    FILE *tfp;

    if (offset > ZIP_OFF_MAX) {
        zip_error_set(&ctx->error, ZIP_ER_SEEK, E2BIG);
        return -1;
    }

#ifdef HAVE_CLONEFILE
    /* clonefile insists on creating the file, so just create a name */
    if (create_temp_file(ctx, false) < 0) {
        return -1;
    }

    if (clonefile(ctx->fname, ctx->tmpname, 0) < 0) {
        zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
        free(ctx->tmpname);
        ctx->tmpname = NULL;
        return -1;
    }
    if ((tfp = _zip_fopen_close_on_exec(ctx->tmpname, true)) == NULL) {
        zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
        (void)remove(ctx->tmpname);
        free(ctx->tmpname);
        ctx->tmpname = NULL;
        return -1;
    }
#else
    {
        int fd;
        struct file_clone_range range;
        zip_os_stat_t st;

        if (zip_os_fstat(fileno(ctx->f), &st) < 0) {
            zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
            return -1;
        }

        if ((fd = create_temp_file(ctx, true)) < 0) {
            return -1;
        }

        range.src_fd = fileno(ctx->f);
        range.src_offset = 0;
        range.src_length = ((offset + st.st_blksize - 1) / st.st_blksize) * st.st_blksize;
        if (range.src_length > st.st_size) {
            range.src_length = 0;
        }
        range.dest_offset = 0;
        if (ioctl(fd, FICLONERANGE, &range) < 0) {
            zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
            (void)close(fd);
            (void)remove(ctx->tmpname);
            free(ctx->tmpname);
            ctx->tmpname = NULL;
            return -1;
        }

        if ((tfp = fdopen(fd, "r+b")) == NULL) {
            zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
            (void)close(fd);
            (void)remove(ctx->tmpname);
            free(ctx->tmpname);
            ctx->tmpname = NULL;
            return -1;
        }
    }
#endif

    if (ftruncate(fileno(tfp), (off_t)offset) < 0) {
        (void)fclose(tfp);
        (void)remove(ctx->tmpname);
        free(ctx->tmpname);
        ctx->tmpname = NULL;
        return -1;
    }
    if (zip_os_fseek(tfp, (zip_off_t)offset, SEEK_SET) < 0) {
        zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
        (void)fclose(tfp);
        (void)remove(ctx->tmpname);
        free(ctx->tmpname);
        ctx->tmpname = NULL;
        return -1;
    }

    ctx->fout = tfp;

    return 0;
}
#endif

static bool _zip_stdio_op_open(zip_source_file_context_t *ctx) {
    if ((ctx->f = _zip_fopen_close_on_exec(ctx->fname, false)) == NULL) {
        zip_error_set(&ctx->error, ZIP_ER_OPEN, errno);
        return false;
    }
    return true;
}


static zip_int64_t _zip_stdio_op_remove(zip_source_file_context_t *ctx) {
    if (remove(ctx->fname) < 0) {
        zip_error_set(&ctx->error, ZIP_ER_REMOVE, errno);
        return -1;
    }
    return 0;
}


static void _zip_stdio_op_rollback_write(zip_source_file_context_t *ctx) {
    if (ctx->fout) {
        fclose(ctx->fout);
    }
    (void)remove(ctx->tmpname);
}

static char *_zip_stdio_op_strdup(zip_source_file_context_t *ctx, const char *string) {
    return strdup(string);
}


static zip_int64_t _zip_stdio_op_write(zip_source_file_context_t *ctx, const void *data, zip_uint64_t len) {
    size_t ret;

    clearerr((FILE *)ctx->fout);
    ret = fwrite(data, 1, len, (FILE *)ctx->fout);
    if (ret != len || ferror((FILE *)ctx->fout)) {
        zip_error_set(&ctx->error, ZIP_ER_WRITE, errno);
        return -1;
    }

    return (zip_int64_t)ret;
}


static int create_temp_file(zip_source_file_context_t *ctx, bool create_file) {
    char *temp;
    mode_t mode;
    zip_os_stat_t st;
    int fd = 0;
    char *start, *end;

    if (zip_os_stat(ctx->fname, &st) == 0) {
        /* If the file already exists, we copy permissions on commit, so err on the side of caution. */
        ctx->temp_output_created = false;
        mode = 0600;
    }
    else {
        /* If we create a new file, we want 0666 with umask applied. Since we can't read the current umask, we can't apply that mode on commit, so we set it here instead. */
        ctx->temp_output_created = true;
        mode = 0666;
    }

    size_t temp_size = strlen(ctx->fname) + 13;
    if ((temp = (char *)malloc(temp_size)) == NULL) {
        zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
        return -1;
    }
    snprintf_s(temp, temp_size, "%s.XXXXXX.part", ctx->fname);
    end = temp + strlen(temp) - 5;
    start = end - 6;

    for (;;) {
        zip_uint32_t value = zip_random_uint32();
        char *xs = start;

        while (xs < end) {
            char digit = value % 36;
            if (digit < 10) {
                *(xs++) = digit + '0';
            }
            else {
                *(xs++) = digit - 10 + 'a';
            }
            value /= 36;
        }

        if (create_file) {
            if ((fd = open(temp, O_CREAT | O_EXCL | O_RDWR | O_CLOEXEC, mode)) >= 0) {
                break;
            }
            if (errno != EEXIST) {
                zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
                free(temp);
                return -1;
            }
        }
        else {
            if (zip_os_stat(temp, &st) < 0) {
                if (errno == ENOENT) {
                    break;
                }
                else {
                    zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
                    free(temp);
                    return -1;
                }
            }
        }
    }

    ctx->tmpname = temp;

    return fd; /* initialized to 0 if !create_file */
}


/*
 * fopen replacement that sets the close-on-exec flag
 * some implementations support an fopen 'e' flag for that,
 * but e.g. macOS doesn't.
 */
static FILE *_zip_fopen_close_on_exec(const char *name, bool writeable) {
    int fd;
    int flags;
    FILE *fp;

    flags = O_CLOEXEC;
    if (writeable) {
        flags |= O_RDWR;
    }
    else {
        flags |= O_RDONLY;
    }

    /* mode argument needed on Windows */
    if ((fd = open(name, flags, 0666)) < 0) {
        return NULL;
    }
    if ((fp = fdopen(fd, writeable ? "r+b" : "rb")) == NULL) {
        return NULL;
    }
    return fp;
}

static bool copy_permissions(zip_source_file_context_t *ctx) {
    zip_os_stat_t st;

    if (zip_os_stat(ctx->fname, &st) < 0) {
        zip_error_set(&ctx->error, ZIP_ER_RENAME, errno);
        return false;
    }
    /* TODO: copy ACLs */
    if (chmod(ctx->tmpname, st.st_mode) < 0) {
        zip_error_set(&ctx->error, ZIP_ER_RENAME, errno);
        return false;
    }
    return true;
}

Coverage Report

Created: 2026-08-25 06:40

Line	Count	Source
1		/*
2		zip_source_file_stdio_named.c -- source for stdio file opened by name
3		Copyright (C) 1999-2024 Dieter Baron and Thomas Klausner
4
5		This file is part of libzip, a library to manipulate ZIP archives.
6		The authors can be contacted at <info@libzip.org>
7
8		Redistribution and use in source and binary forms, with or without
9		modification, are permitted provided that the following conditions
10		are met:
11		1. Redistributions of source code must retain the above copyright
12		notice, this list of conditions and the following disclaimer.
13		2. Redistributions in binary form must reproduce the above copyright
14		notice, this list of conditions and the following disclaimer in
15		the documentation and/or other materials provided with the
16		distribution.
17		3. The names of the authors may not be used to endorse or promote
18		products derived from this software without specific prior
19		written permission.
20
21		THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
22		OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23		WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24		ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25		DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26		DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27		GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28		INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29		IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30		OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31		IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32		*/
33
34		#include "zipint.h"
35
36		#include "zip_source_file.h"
37		#include "zip_source_file_stdio.h"
38
39		#include <fcntl.h>
40		#include <stdlib.h>
41		#include <sys/stat.h>
42		#ifdef HAVE_UNISTD_H
43		#include <unistd.h>
44		#endif
45
46		#ifdef HAVE_CLONEFILE
47		#include <sys/attr.h>
48		#include <sys/clonefile.h>
49		#define CAN_CLONE
50		#endif
51		#ifdef HAVE_FICLONERANGE
52		#include <linux/fs.h>
53		#include <sys/ioctl.h>
54		#define CAN_CLONE
55		#endif
56
57		static bool copy_permissions(zip_source_file_context_t *ctx);
58		static int create_temp_file(zip_source_file_context_t *ctx, bool create_file);
59
60		static zip_int64_t _zip_stdio_op_commit_write(zip_source_file_context_t *ctx);
61		static zip_int64_t _zip_stdio_op_create_temp_output(zip_source_file_context_t *ctx);
62		#ifdef CAN_CLONE
63		static zip_int64_t _zip_stdio_op_create_temp_output_cloning(zip_source_file_context_t *ctx, zip_uint64_t offset);
64		#endif
65		static bool _zip_stdio_op_open(zip_source_file_context_t *ctx);
66		static zip_int64_t _zip_stdio_op_remove(zip_source_file_context_t *ctx);
67		static void _zip_stdio_op_rollback_write(zip_source_file_context_t *ctx);
68		static char _zip_stdio_op_strdup(zip_source_file_context_t ctx, const char *string);
69		static zip_int64_t _zip_stdio_op_write(zip_source_file_context_t ctx, const void data, zip_uint64_t len);
70		static FILE _zip_fopen_close_on_exec(const char name, bool writeable);
71
72		/* clang-format off */
73		static zip_source_file_operations_t ops_stdio_named = {
74		_zip_stdio_op_close,
75		_zip_stdio_op_commit_write,
76		_zip_stdio_op_create_temp_output,
77		#ifdef CAN_CLONE
78		_zip_stdio_op_create_temp_output_cloning,
79		#else
80		NULL,
81		#endif
82		_zip_stdio_op_open,
83		_zip_stdio_op_read,
84		_zip_stdio_op_remove,
85		_zip_stdio_op_rollback_write,
86		_zip_stdio_op_seek,
87		_zip_stdio_op_stat,
88		_zip_stdio_op_strdup,
89		_zip_stdio_op_tell,
90		_zip_stdio_op_write
91		};
92		/* clang-format on */
93
94	0	ZIP_EXTERN zip_source_t zip_source_file(zip_t za, const char *fname, zip_uint64_t start, zip_int64_t len) {
95	0	if (za == NULL) {
96	0	return NULL;
97	0	}
98
99	0	return zip_source_file_create(fname, start, len, &za->error);
100	0	}
101
102
103	9.04k	ZIP_EXTERN zip_source_t zip_source_file_create(const char fname, zip_uint64_t start, zip_int64_t length, zip_error_t *error) {
104	9.04k	if (fname == NULL \|\| length < ZIP_LENGTH_UNCHECKED) {
105	0	zip_error_set(error, ZIP_ER_INVAL, 0);
106	0	return NULL;
107	0	}
108
109	9.04k	return zip_source_file_common_new(fname, NULL, start, length, NULL, &ops_stdio_named, NULL, error);
110	9.04k	}
111
112
113	0	static zip_int64_t _zip_stdio_op_commit_write(zip_source_file_context_t *ctx) {
114	0	if (fclose(ctx->fout) < 0) {
115	0	zip_error_set(&ctx->error, ZIP_ER_WRITE, errno);
116	0	return -1;
117	0	}
118	0	if (!ctx->temp_output_created) {
119	0	if (!copy_permissions(ctx)) {
120	0	return -1;
121	0	}
122	0	}
123	0	if (rename(ctx->tmpname, ctx->fname) < 0) {
124	0	zip_error_set(&ctx->error, ZIP_ER_RENAME, errno);
125	0	return -1;
126	0	}
127
128	0	return 0;
129	0	}
130
131
132	0	static zip_int64_t _zip_stdio_op_create_temp_output(zip_source_file_context_t *ctx) {
133	0	int fd = create_temp_file(ctx, true);
134
135	0	if (fd < 0) {
136	0	return -1;
137	0	}
138
139	0	if ((ctx->fout = fdopen(fd, "r+b")) == NULL) {
140	0	zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
141	0	close(fd);
142	0	(void)remove(ctx->tmpname);
143	0	free(ctx->tmpname);
144	0	ctx->tmpname = NULL;
145	0	return -1;
146	0	}
147
148	0	return 0;
149	0	}
150
151		#ifdef CAN_CLONE
152	0	static zip_int64_t _zip_stdio_op_create_temp_output_cloning(zip_source_file_context_t *ctx, zip_uint64_t offset) {
153	0	FILE *tfp;
154
155	0	if (offset > ZIP_OFF_MAX) {
156	0	zip_error_set(&ctx->error, ZIP_ER_SEEK, E2BIG);
157	0	return -1;
158	0	}
159
160		#ifdef HAVE_CLONEFILE
161		/* clonefile insists on creating the file, so just create a name */
162		if (create_temp_file(ctx, false) < 0) {
163		return -1;
164		}
165
166		if (clonefile(ctx->fname, ctx->tmpname, 0) < 0) {
167		zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
168		free(ctx->tmpname);
169		ctx->tmpname = NULL;
170		return -1;
171		}
172		if ((tfp = _zip_fopen_close_on_exec(ctx->tmpname, true)) == NULL) {
173		zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
174		(void)remove(ctx->tmpname);
175		free(ctx->tmpname);
176		ctx->tmpname = NULL;
177		return -1;
178		}
179		#else
180	0	{
181	0	int fd;
182	0	struct file_clone_range range;
183	0	zip_os_stat_t st;
184
185	0	if (zip_os_fstat(fileno(ctx->f), &st) < 0) {
186	0	zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
187	0	return -1;
188	0	}
189
190	0	if ((fd = create_temp_file(ctx, true)) < 0) {
191	0	return -1;
192	0	}
193
194	0	range.src_fd = fileno(ctx->f);
195	0	range.src_offset = 0;
196	0	range.src_length = ((offset + st.st_blksize - 1) / st.st_blksize) * st.st_blksize;
197	0	if (range.src_length > st.st_size) {
198	0	range.src_length = 0;
199	0	}
200	0	range.dest_offset = 0;
201	0	if (ioctl(fd, FICLONERANGE, &range) < 0) {
202	0	zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
203	0	(void)close(fd);
204	0	(void)remove(ctx->tmpname);
205	0	free(ctx->tmpname);
206	0	ctx->tmpname = NULL;
207	0	return -1;
208	0	}
209
210	0	if ((tfp = fdopen(fd, "r+b")) == NULL) {
211	0	zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
212	0	(void)close(fd);
213	0	(void)remove(ctx->tmpname);
214	0	free(ctx->tmpname);
215	0	ctx->tmpname = NULL;
216	0	return -1;
217	0	}
218	0	}
219	0	#endif
220
221	0	if (ftruncate(fileno(tfp), (off_t)offset) < 0) {
222	0	(void)fclose(tfp);
223	0	(void)remove(ctx->tmpname);
224	0	free(ctx->tmpname);
225	0	ctx->tmpname = NULL;
226	0	return -1;
227	0	}
228	0	if (zip_os_fseek(tfp, (zip_off_t)offset, SEEK_SET) < 0) {
229	0	zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
230	0	(void)fclose(tfp);
231	0	(void)remove(ctx->tmpname);
232	0	free(ctx->tmpname);
233	0	ctx->tmpname = NULL;
234	0	return -1;
235	0	}
236
237	0	ctx->fout = tfp;
238
239	0	return 0;
240	0	}
241		#endif
242
243	9.04k	static bool _zip_stdio_op_open(zip_source_file_context_t *ctx) {
244	9.04k	if ((ctx->f = _zip_fopen_close_on_exec(ctx->fname, false)) == NULL) {
245	0	zip_error_set(&ctx->error, ZIP_ER_OPEN, errno);
246	0	return false;
247	0	}
248	9.04k	return true;
249	9.04k	}
250
251
252	0	static zip_int64_t _zip_stdio_op_remove(zip_source_file_context_t *ctx) {
253	0	if (remove(ctx->fname) < 0) {
254	0	zip_error_set(&ctx->error, ZIP_ER_REMOVE, errno);
255	0	return -1;
256	0	}
257	0	return 0;
258	0	}
259
260
261	0	static void _zip_stdio_op_rollback_write(zip_source_file_context_t *ctx) {
262	0	if (ctx->fout) {
263	0	fclose(ctx->fout);
264	0	}
265	0	(void)remove(ctx->tmpname);
266	0	}
267
268	9.04k	static char _zip_stdio_op_strdup(zip_source_file_context_t ctx, const char *string) {
269	9.04k	return strdup(string);
270	9.04k	}
271
272
273	0	static zip_int64_t _zip_stdio_op_write(zip_source_file_context_t ctx, const void data, zip_uint64_t len) {
274	0	size_t ret;
275
276	0	clearerr((FILE *)ctx->fout);
277	0	ret = fwrite(data, 1, len, (FILE *)ctx->fout);
278	0	if (ret != len \|\| ferror((FILE *)ctx->fout)) {
279	0	zip_error_set(&ctx->error, ZIP_ER_WRITE, errno);
280	0	return -1;
281	0	}
282
283	0	return (zip_int64_t)ret;
284	0	}
285
286
287	0	static int create_temp_file(zip_source_file_context_t *ctx, bool create_file) {
288	0	char *temp;
289	0	mode_t mode;
290	0	zip_os_stat_t st;
291	0	int fd = 0;
292	0	char start, end;
293
294	0	if (zip_os_stat(ctx->fname, &st) == 0) {
295		/* If the file already exists, we copy permissions on commit, so err on the side of caution. */
296	0	ctx->temp_output_created = false;
297	0	mode = 0600;
298	0	}
299	0	else {
300		/* If we create a new file, we want 0666 with umask applied. Since we can't read the current umask, we can't apply that mode on commit, so we set it here instead. */
301	0	ctx->temp_output_created = true;
302	0	mode = 0666;
303	0	}
304
305	0	size_t temp_size = strlen(ctx->fname) + 13;
306	0	if ((temp = (char *)malloc(temp_size)) == NULL) {
307	0	zip_error_set(&ctx->error, ZIP_ER_MEMORY, 0);
308	0	return -1;
309	0	}
310	0	snprintf_s(temp, temp_size, "%s.XXXXXX.part", ctx->fname);
311	0	end = temp + strlen(temp) - 5;
312	0	start = end - 6;
313
314	0	for (;;) {
315	0	zip_uint32_t value = zip_random_uint32();
316	0	char *xs = start;
317
318	0	while (xs < end) {
319	0	char digit = value % 36;
320	0	if (digit < 10) {
321	0	*(xs++) = digit + '0';
322	0	}
323	0	else {
324	0	*(xs++) = digit - 10 + 'a';
325	0	}
326	0	value /= 36;
327	0	}
328
329	0	if (create_file) {
330	0	if ((fd = open(temp, O_CREAT \| O_EXCL \| O_RDWR \| O_CLOEXEC, mode)) >= 0) {
331	0	break;
332	0	}
333	0	if (errno != EEXIST) {
334	0	zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
335	0	free(temp);
336	0	return -1;
337	0	}
338	0	}
339	0	else {
340	0	if (zip_os_stat(temp, &st) < 0) {
341	0	if (errno == ENOENT) {
342	0	break;
343	0	}
344	0	else {
345	0	zip_error_set(&ctx->error, ZIP_ER_TMPOPEN, errno);
346	0	free(temp);
347	0	return -1;
348	0	}
349	0	}
350	0	}
351	0	}
352
353	0	ctx->tmpname = temp;
354
355	0	return fd; /* initialized to 0 if !create_file */
356	0	}
357
358
359		/*
360		* fopen replacement that sets the close-on-exec flag
361		* some implementations support an fopen 'e' flag for that,
362		* but e.g. macOS doesn't.
363		*/
364	9.04k	static FILE _zip_fopen_close_on_exec(const char name, bool writeable) {
365	9.04k	int fd;
366	9.04k	int flags;
367	9.04k	FILE *fp;
368
369	9.04k	flags = O_CLOEXEC;
370	9.04k	if (writeable) {
371	0	flags \|= O_RDWR;
372	0	}
373	9.04k	else {
374	9.04k	flags \|= O_RDONLY;
375	9.04k	}
376
377		/* mode argument needed on Windows */
378	9.04k	if ((fd = open(name, flags, 0666)) < 0) {
379	0	return NULL;
380	0	}
381	9.04k	if ((fp = fdopen(fd, writeable ? "r+b" : "rb")) == NULL) {
382	0	return NULL;
383	0	}
384	9.04k	return fp;
385	9.04k	}
386
387	0	static bool copy_permissions(zip_source_file_context_t *ctx) {
388	0	zip_os_stat_t st;
389
390	0	if (zip_os_stat(ctx->fname, &st) < 0) {
391	0	zip_error_set(&ctx->error, ZIP_ER_RENAME, errno);
392	0	return false;
393	0	}
394		/* TODO: copy ACLs */
395	0	if (chmod(ctx->tmpname, st.st_mode) < 0) {
396	0	zip_error_set(&ctx->error, ZIP_ER_RENAME, errno);
397	0	return false;
398	0	}
399	0	return true;
400	0	}