Mercurial > molko
diff src/libmlk-core/core/vfs-zip.c @ 335:68287c7bcdb5
core: implement vfs-zip (read-only)
author | David Demelier <markand@malikania.fr> |
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date | Wed, 13 Oct 2021 15:58:02 +0200 |
parents | |
children | 460c78706989 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/libmlk-core/core/vfs-zip.c Wed Oct 13 15:58:02 2021 +0200 @@ -0,0 +1,123 @@ +/* + * vfs-zip.c -- VFS subsystem for zip archives + * + * Copyright (c) 2020-2021 David Demelier <markand@malikania.fr> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <assert.h> +#include <string.h> + +#include <zip.h> + +#include "error.h" +#include "vfs-zip.h" +#include "vfs.h" + +static inline int +mkflags(const char *mode) +{ + /* TODO: this should check for mutual exclusions. */ + int flags = 0; + + for (; *mode; ++mode) { + switch (*mode) { + case 'w': + flags |= ZIP_CREATE; + break; + case 'x': + flags |= ZIP_EXCL; + break; + case '+': + flags |= ZIP_TRUNCATE; + break; + case 'r': + flags |= ZIP_RDONLY; + break; + default: + break; + } + } + + return flags; +} + +static size_t +file_read(struct vfs_file *file, void *buf, size_t bufsz) +{ + return zip_fread(file->data, buf, bufsz); +} + +static size_t +file_write(struct vfs_file *file, const void *buf, size_t bufsz) +{ + (void)file; + (void)buf; + (void)bufsz; + + return errorf("operation not supported"); +} + +static int +file_flush(struct vfs_file *file) +{ + (void)file; + + return 0; +} + +static void +file_finish(struct vfs_file *file) +{ + zip_fclose(file->data); +} + +static int +impl_open(struct vfs *vfs, struct vfs_file *file, const char *entry, const char *mode) +{ + (void)mode; + + if (!(file->data = zip_fopen(vfs->data, entry, 0))) + return errorf("unable to open file in archive"); + + file->read = file_read; + file->write = file_write; + file->flush = file_flush; + file->finish = file_finish; + + return 0; +} + +static void +impl_finish(struct vfs *vfs) +{ + zip_close(vfs->data); +} + +int +vfs_zip(struct vfs *vfs, const char *file, const char *mode) +{ + assert(vfs); + assert(file); + + memset(vfs, 0, sizeof (*vfs)); + + if (!(vfs->data = zip_open(file, mkflags(mode), NULL))) + return errorf("%s: unable to open zip file", file); + + vfs->open = impl_open; + vfs->finish = impl_finish; + + return 0; +}