1 files changed, 208 insertions, 0 deletions
diff --git a/src/Common/libzip/zip_source_file_stdio.c b/src/Common/libzip/zip_source_file_stdio.c
new file mode 100644
index 00000000..4a22f78c
--- /dev/null
+++ b/src/Common/libzip/zip_source_file_stdio.c
@@ -0,0 +1,208 @@
+/*
+  zip_source_file_stdio.c -- read-only stdio file source implementation
+  Copyright (C) 2020 Dieter Baron and Thomas Klausner
+
+  This file is part of libzip, a library to manipulate ZIP archives.
+  The authors can be contacted at <libzip@nih.at>
+
+  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 <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+#ifdef _WIN32
+#ifndef S_IWUSR
+#define S_IWUSR _S_IWRITE
+#endif
+#endif
+
+/* clang-format off */
+static zip_source_file_operations_t ops_stdio_read = {
+    _zip_stdio_op_close,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    _zip_stdio_op_read,
+    NULL,
+    NULL,
+    _zip_stdio_op_seek,
+    _zip_stdio_op_stat,
+    NULL,
+    _zip_stdio_op_tell,
+    NULL
+};
+/* clang-format on */
+
+
+ZIP_EXTERN zip_source_t *
+zip_source_filep(zip_t *za, FILE *file, zip_uint64_t start, zip_int64_t len) {
+    if (za == NULL) {
+	return NULL;
+    }
+
+    return zip_source_filep_create(file, start, len, &za->error);
+}
+
+
+ZIP_EXTERN zip_source_t *
+zip_source_filep_create(FILE *file, zip_uint64_t start, zip_int64_t length, zip_error_t *error) {
+    if (file == NULL || length < -1) {
+	zip_error_set(error, ZIP_ER_INVAL, 0);
+	return NULL;
+    }
+
+    return zip_source_file_common_new(NULL, file, start, length, NULL, &ops_stdio_read, NULL, error);
+}
+
+
+void
+_zip_stdio_op_close(zip_source_file_context_t *ctx) {
+    fclose((FILE *)ctx->f);
+}
+
+
+zip_int64_t
+_zip_stdio_op_read(zip_source_file_context_t *ctx, void *buf, zip_uint64_t len) {
+    size_t i;
+    if (len > SIZE_MAX) {
+	len = SIZE_MAX;
+    }
+
+    if ((i = fread(buf, 1, (size_t)len, ctx->f)) == 0) {
+	if (ferror((FILE *)ctx->f)) {
+	    zip_error_set(&ctx->error, ZIP_ER_READ, errno);
+	    return -1;
+	}
+    }
+
+    return (zip_int64_t)i;
+}
+
+
+bool
+_zip_stdio_op_seek(zip_source_file_context_t *ctx, void *f, zip_int64_t offset, int whence) {
+#if ZIP_FSEEK_MAX > ZIP_INT64_MAX
+    if (offset > ZIP_FSEEK_MAX || offset < ZIP_FSEEK_MIN) {
+	zip_error_set(&ctx->error, ZIP_ER_SEEK, EOVERFLOW);
+	return false;
+    }
+#endif
+
+    if (fseeko((FILE *)f, (off_t)offset, whence) < 0) {
+	zip_error_set(&ctx->error, ZIP_ER_SEEK, errno);
+	return false;
+    }
+    return true;
+}
+
+
+bool
+_zip_stdio_op_stat(zip_source_file_context_t *ctx, zip_source_file_stat_t *st) {
+    struct stat sb;
+
+    int ret;
+
+    if (ctx->fname) {
+	ret = stat(ctx->fname, &sb);
+    }
+    else {
+	ret = fstat(fileno((FILE *)ctx->f), &sb);
+    }
+
+    if (ret < 0) {
+        if (errno == ENOENT) {
+            st->exists = false;
+            return true;
+        }
+	zip_error_set(&ctx->error, ZIP_ER_READ, errno);
+	return false;
+    }
+
+    st->size = (zip_uint64_t)sb.st_size;
+    st->mtime = sb.st_mtime;
+
+    st->regular_file = S_ISREG(sb.st_mode);
+    st->exists = true;
+
+    /* We're using UNIX file API, even on Windows; thus, we supply external file attributes with Unix values. */
+    /* TODO: This could be improved on Windows by providing Windows-specific file attributes */
+    ctx->attributes.valid = ZIP_FILE_ATTRIBUTES_HOST_SYSTEM | ZIP_FILE_ATTRIBUTES_EXTERNAL_FILE_ATTRIBUTES;
+    ctx->attributes.host_system = ZIP_OPSYS_UNIX;
+    ctx->attributes.external_file_attributes = (((zip_uint32_t)sb.st_mode) << 16) | ((sb.st_mode & S_IWUSR) ? 0 : 1);
+
+    return true;
+}
+
+
+zip_int64_t
+_zip_stdio_op_tell(zip_source_file_context_t *ctx, void *f) {
+    off_t offset = ftello((FILE *)f);
+
+    if (offset < 0) {
+	zip_error_set(&ctx->error, ZIP_ER_SEEK, errno);
+    }
+
+    return offset;
+}
+
+
+/*
+ * fopen replacement that sets the close-on-exec flag
+ * some implementations support an fopen 'e' flag for that,
+ * but e.g. macOS doesn't.
+ */
+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;
+}