* SPDX-License-Identifier: BSD-2-Clause

/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2012 Michihiro NAKAJIMA
* All rights reserved.
*/

#include "bsdtar_platform.h"

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif

#include "bsdtar.h"
#include "err.h"

struct creation_set {
char *create_format;
struct filter_set {
int program; /* Set 1 if filter is a program name */
char *filter_name;
} *filters;
int filter_count;
};

struct suffix_code_t {
const char *suffix;
const char *form;
};

static const char *
get_suffix_code(const struct suffix_code_t *tbl, const char *suffix)
{
int i;

if (suffix == NULL)
return (NULL);
for (i = 0; tbl[i].suffix != NULL; i++) {
if (strcmp(tbl[i].suffix, suffix) == 0)
return (tbl[i].form);
}
return (NULL);
}

static const char *
get_filter_code(const char *suffix)
{
/* A pair of suffix and compression/filter. */
static const struct suffix_code_t filters[] = {
{ ".Z", "compress" },
{ ".bz2", "bzip2" },
{ ".gz", "gzip" },
{ ".grz", "grzip" },
{ ".lrz", "lrzip" },
{ ".lz", "lzip" },
{ ".lz4", "lz4" },
{ ".lzo", "lzop" },
{ ".lzma", "lzma" },
{ ".uu", "uuencode" },
{ ".xz", "xz" },
{ ".zst", "zstd"},
{ NULL, NULL }
};

return get_suffix_code(filters, suffix);
}

static const char *
get_format_code(const char *suffix)
{
/* A pair of suffix and format. */
static const struct suffix_code_t formats[] = {
{ ".7z", "7zip" },
{ ".ar", "arbsd" },
{ ".cpio", "cpio" },
{ ".iso", "iso9660" },
{ ".mtree", "mtree" },
{ ".shar", "shar" },
{ ".tar", "paxr" },
{ ".warc", "warc" },
{ ".xar", "xar" },
{ ".zip", "zip" },
{ NULL, NULL }
};

return get_suffix_code(formats, suffix);
}

static const char *
decompose_alias(const char *suffix)
{
static const struct suffix_code_t alias[] = {
{ ".taz", ".tar.gz" },
{ ".tgz", ".tar.gz" },
{ ".tbz", ".tar.bz2" },
{ ".tbz2", ".tar.bz2" },
{ ".tz2", ".tar.bz2" },
{ ".tlz", ".tar.lzma" },
{ ".txz", ".tar.xz" },
{ ".tzo", ".tar.lzo" },
{ ".taZ", ".tar.Z" },
{ ".tZ", ".tar.Z" },
{ ".tzst", ".tar.zst" },
{ NULL, NULL }
};

return get_suffix_code(alias, suffix);
}

static void
_cset_add_filter(struct creation_set *cset, int program, const char *filter)
{
struct filter_set *new_ptr;
char *new_filter;

new_ptr = realloc(cset->filters,
sizeof(*cset->filters) * (cset->filter_count + 1));
if (new_ptr == NULL)
lafe_errc(1, 0, "No memory");
new_filter = strdup(filter);
if (new_filter == NULL)
lafe_errc(1, 0, "No memory");
cset->filters = new_ptr;
cset->filters[cset->filter_count].program = program;
cset->filters[cset->filter_count].filter_name = new_filter;
cset->filter_count++;
}

void
cset_add_filter(struct creation_set *cset, const char *filter)
{
_cset_add_filter(cset, 0, filter);
}

void
cset_add_filter_program(struct creation_set *cset, const char *filter)
{
_cset_add_filter(cset, 1, filter);
}

int
cset_read_support_filter_program(struct creation_set *cset, struct archive *a)
{
int cnt = 0, i;

for (i = 0; i < cset->filter_count; i++) {
if (cset->filters[i].program) {
archive_read_support_filter_program(a,
cset->filters[i].filter_name);
++cnt;
}
}
return (cnt);
}

int
cset_write_add_filters(struct creation_set *cset, struct archive *a,
const void **filter_name)
{
int cnt = 0, i, r;

for (i = 0; i < cset->filter_count; i++) {
if (cset->filters[i].program)
r = archive_write_add_filter_program(a,
cset->filters[i].filter_name);
else
r = archive_write_add_filter_by_name(a,
cset->filters[i].filter_name);
if (r < ARCHIVE_WARN) {
*filter_name = cset->filters[i].filter_name;
return (r);
}
++cnt;
}
return (cnt);
}

void
cset_set_format(struct creation_set *cset, const char *format)
{
char *f;

f = strdup(format);
if (f == NULL)
lafe_errc(1, 0, "No memory");
free(cset->create_format);
cset->create_format = f;
}

const char *
cset_get_format(struct creation_set *cset)
{
return (cset->create_format);
}

static void
_cleanup_filters(struct filter_set *filters, int count)
{
int i;

for (i = 0; i < count; i++)
free(filters[i].filter_name);
free(filters);
}

/*
* Clean up a creation set.
*/
void
cset_free(struct creation_set *cset)
{
_cleanup_filters(cset->filters, cset->filter_count);
free(cset->create_format);
free(cset);
}

struct creation_set *
cset_new(void)
{
return calloc(1, sizeof(struct creation_set));
}

/*
* Build a creation set by a file name suffix.
*/
int
cset_auto_compress(struct creation_set *cset, const char *filename)
{
struct filter_set *old_filters;
char *name, *p;
const char *code;
int old_filter_count;

name = strdup(filename);
if (name == NULL)
lafe_errc(1, 0, "No memory");
/* Save previous filters. */
old_filters = cset->filters;
old_filter_count = cset->filter_count;
cset->filters = NULL;
cset->filter_count = 0;

for (;;) {
/* Get the suffix. */
p = strrchr(name, '.');
if (p == NULL)
break;
/* Suppose it indicates compression/filter type
* such as ".gz". */
code = get_filter_code(p);
if (code != NULL) {
cset_add_filter(cset, code);
*p = '\0';
continue;
}
/* Suppose it indicates format type such as ".tar". */
code = get_format_code(p);
if (code != NULL) {
cset_set_format(cset, code);
break;
}
/* Suppose it indicates alias such as ".tgz". */
code = decompose_alias(p);
if (code == NULL)
break;
/* Replace the suffix. */
*p = '\0';
name = realloc(name, strlen(name) + strlen(code) + 1);
if (name == NULL)
lafe_errc(1, 0, "No memory");
strcat(name, code);
}
free(name);
if (cset->filters) {
struct filter_set *v;
int i, r;

/* Release previous filters. */
_cleanup_filters(old_filters, old_filter_count);

v = malloc(sizeof(*v) * cset->filter_count);
if (v == NULL)
lafe_errc(1, 0, "No memory");
/* Reverse filter sequence. */
for (i = 0, r = cset->filter_count; r > 0; )
v[i++] = cset->filters[--r];
free(cset->filters);
cset->filters = v;
return (1);
} else {
/* Put previous filters back. */
cset->filters = old_filters;
cset->filter_count = old_filter_count;
return (0);
}
}