/*

 * Copyright (C) 2008  Kristian Høgsberg <krh@redhat.com>

 * Copyright (C) 2008  Red Hat, Inc

 * Copyright (C) 2009, 2011, 2012, 2014, 2016  J. Ali Harlow <ali@juiblex.co.uk>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

#include "config.h"

#include <limits.h>

#include <string.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <stdlib.h>

#include <stdio.h>

#include <stdint.h>

#include <errno.h>

#include <unistd.h>

#include <fcntl.h>

#include <dirent.h>

#ifdef MSWIN_API

#include <windows.h>

#include <direct.h>

#endif

#if HAVE_SYS_MMAN_H

#include <sys/mman.h>

#endif

#if HAVE_LIBARCHIVE

#include <archive.h>

#include <archive_entry.h>

#endif

#include <assert.h>

#include "razor.h"

#include "types/types.h"

#include "razor-internal.h"

#ifndef O_BINARY

#define O_BINARY	0

#endif

#define strcmp0(s1, s2)		((s1) && (s2) ? strcmp(s1, s2) : \

				 (s1) ? 1 : (s2) ? -1 : 0)

static void *

razor_archive_get_file_contents(const char *filename, int fd, const char *path,

				size_t *length, struct razor_error **error)

{

#if HAVE_LIBARCHIVE

	int r;

	const char *errmsg;

	void *addr;

	const void *buf;

	size_t size, total_size;

	off_t offset;

	struct archive *a;

	struct archive_entry *entry;

	a = archive_read_new();

	archive_read_support_compression_all(a);

	archive_read_support_format_all(a);

	r = archive_read_open_fd(a, fd, 10240);

	if (r) {

		errmsg = archive_error_string(a);

		if (!strcmp(errmsg, "Unrecognized archive format"))

			razor_set_error(error, RAZOR_GENERAL_ERROR,

					RAZOR_GENERAL_ERROR_UNSUPPORTED_ARCHIVE,

					filename, errmsg);

		else

			razor_set_error(error, RAZOR_POSIX_ERROR,

					archive_errno(a), filename, errmsg);

		archive_read_finish(a);

		return NULL;

	}

	for (;;) {

		r = archive_read_next_header(a, &entry);

		if (r == ARCHIVE_EOF)

			break;

		else if (r < ARCHIVE_WARN) {

			razor_set_error(error, RAZOR_POSIX_ERROR,

					archive_errno(a), filename,

					archive_error_string(a));

			archive_read_close(a);

			archive_read_finish(a);

			return NULL;

		}

		/*

		 * TODO: Unicode support. Might need to wait for libarchive v4.

		 */

		if (!strcmp(archive_entry_pathname(entry), path)) {

			total_size = archive_entry_size(entry);

			addr = malloc(total_size);

			if (!addr) {

				archive_read_close(a);

				archive_read_finish(a);

				razor_set_error(error, RAZOR_POSIX_ERROR,

						ENOMEM, NULL,

						"Not enough memory");

				return NULL;

			}

			for(;;) {

				r = archive_read_data_block(a, &buf, &size,

							    &offset);

				if (r == ARCHIVE_EOF)

					break;

				if (r < ARCHIVE_OK) {

					razor_set_error(error, RAZOR_POSIX_ERROR,

							archive_errno(a), path,

							archive_error_string(a));

					free(addr);

					addr = NULL;

					break;

				}

				memcpy((char *)addr + offset, buf, size);

			}

			archive_read_close(a);

			archive_read_finish(a);

			*length = total_size;

			return addr;

		}

	}

	archive_read_close(a);

	archive_read_finish(a);

	razor_set_error(error, RAZOR_POSIX_ERROR, ENOENT, path,

			"No such file or directory in archive");

	return NULL;

#else

	razor_set_error(error, RAZOR_GENERAL_ERROR,

			RAZOR_GENERAL_ERROR_UNSUPPORTED_ARCHIVE,

			filename, "Archives are not supported in this build");

	return NULL;

#endif	/* HAVE_LIBARCHIVE */

}

static void *

razor_file_get_contents_archive(const char *filename, size_t *length,

				struct razor_error **error)

{

	int fd;

	char *path, *slash, *s;

	void *addr;

	struct razor_error *tmp_error = NULL;

	path = strdup(filename);

	slash = strrchr(path, '/');

	while (slash) {

		*slash = '\0';

		fd = open(path, O_RDONLY | O_BINARY);

		if (fd >= 0) {

			addr = razor_archive_get_file_contents(path, fd,

							       slash + 1,

							       length,

							       error);

			free(path);

			close(fd);

			return addr;

#ifdef MSWIN_API

		} else if (errno != ENOTDIR && errno != ENOENT) {

#else

		} else if (errno != ENOTDIR) {

#endif

			free(path);

			razor_set_error_posix(error, filename);

			return NULL;

		}

		s = strrchr(path, '/');

		*slash = '/';

		slash = s;

	}

	free(path);

#ifdef MSWIN_API

	razor_set_error(error, RAZOR_POSIX_ERROR, ENOENT, filename,

			strerror(ENOENT));

#else

	razor_set_error(error, RAZOR_POSIX_ERROR, ENOTDIR, filename,

			strerror(ENOTDIR));

#endif

	return NULL;

}

#define OPEN_FILE_USED		(1U<<0)

#define OPEN_FILE_MMAPPED	(1U<<1)

struct open_file {

	void *addr;

	size_t length;

	uint32_t flags;

};

struct array open_files = { 0, };

void *razor_file_get_contents(const char *filename, size_t *length, int private,

			      struct razor_error **error)

{

	int fd;

	struct stat st;

	void *addr = NULL;

	size_t nb, size;

	ssize_t res;

	struct open_file *of, *ofend;

	fd = open(filename, O_RDONLY | O_BINARY);

	if (fd < 0) {

#ifdef MSWIN_API

		if (errno != ENOTDIR && errno != ENOENT) {

#else

		if (errno != ENOTDIR) {

#endif

			razor_set_error_posix(error, filename);

			return NULL;

		}

		addr = razor_file_get_contents_archive(filename, &size, error);

		if (!addr)

			return NULL;

	} else {

		if (fstat(fd, &st) < 0) {

			razor_set_error_posix(error, filename);

			close(fd);

			return NULL;

		}

		size = st.st_size;

	}

	ofend = open_files.data + open_files.size;

	for (of = open_files.data; of < ofend; of++)

		if (!(of->flags & OPEN_FILE_USED))

			break;

	if (of == ofend) {

		of = array_add(&open_files, sizeof *of);

		of->flags = 0;

	}

#if HAVE_SYS_MMAN_H

	if (!addr && !private) {

		addr = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);

		if (addr == MAP_FAILED)

			addr = NULL;

		else

			of->flags = OPEN_FILE_USED | OPEN_FILE_MMAPPED;

	}

#endif	/* HAVE_SYS_MMAN_H */

	if (!addr) {

		addr = malloc(size);

		if (addr) {

			nb = 0;

			while(nb < size) {

				res = read(fd, addr + nb, size - nb);

				if (res <= 0) {

					razor_set_error_posix(error, filename);

					free(addr);

					addr = NULL;

					break;

				}

				nb += res;

			}

			if (addr)

				of->flags = OPEN_FILE_USED;

		} else

			razor_set_error(error, RAZOR_POSIX_ERROR, ENOMEM, NULL,

					"Not enough memory");

	}

	if (fd >= 0)

		close(fd);

	of->addr = addr;

	of->length = size;

	if (addr)

		*length = size;

	return addr;

}

int razor_file_free_contents(void *addr, size_t length)

{

#if HAVE_SYS_MMAN_H

	int mmapped;

#endif

	struct open_file *of, *ofend;

	ofend = open_files.data + open_files.size;

	for (of = open_files.data; of < ofend; of++)

		if ((of->flags & OPEN_FILE_USED) && of->addr == addr)

			break;

	if (of == ofend)

		return -2;

	length = of->length;

#if HAVE_SYS_MMAN_H

	mmapped = of->flags & OPEN_FILE_MMAPPED;

#endif

	of->flags &= ~OPEN_FILE_USED;

	for (of = open_files.data; of < ofend; of++)

		if (of->flags & OPEN_FILE_USED)

			break;

	if (of == ofend) {

		array_release(&open_files);

		array_init(&open_files);

	}

#if HAVE_SYS_MMAN_H

	if (mmapped)

		return munmap(addr, length);

#endif

	free(addr);

	return 0;

}

int razor_file_mkdir(const char *path, mode_t mode, struct razor_error **error)

{

	int retval, code;

	struct stat buf;

	retval = mkdir(path, mode);

	if (retval) {

		/*

		 * Ignore the case of a pre-existing directory and give

		 * an explicit error message if there is something other

		 * than a directory already at path.

		 */

		code = errno;

		if (code != EEXIST || stat(path, &buf))

			razor_set_error(error, RAZOR_POSIX_ERROR, code, path,

					strerror(code));

		else if (!S_ISDIR(buf.st_mode))

			razor_set_error(error, RAZOR_POSIX_ERROR, code, path,

					"Not a directory");

	}

	return retval;

}

int razor_file_unlink(const char *path, struct razor_error **error)

{

	int retval;

	retval = unlink(path);

	if (retval)

		razor_set_error_posix(error, path);

	return retval;

}

int razor_file_open(const char *path, int flags, mode_t mode,

		    struct razor_error **error)

{

	int retval;

	retval = open(path, flags, mode);

	if (retval < 0)

		razor_set_error_posix(error, path);

	return retval;

}

int razor_file_move(const char *path, const char *dest,

		    struct razor_error **error)

{

	int retval = 0;

#ifdef MSWIN_API

	wchar_t *oldbuf, *newbuf;

	const DWORD flags = MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING;

	newbuf = razor_utf8_to_utf16(dest, -1);

	oldbuf = razor_utf8_to_utf16(path, -1);

	/*

	 * Passing MOVEFILE_REPLACE_EXISTING to MoveFileEx() will

	 * cover every case we care about _except_ replacing an empty

	 * directory with a file. Calling RemoveDirectory() will deal

	 * with this case while having no effect in all other cases.

	 */

	(void)RemoveDirectoryW(newbuf);

	if (!MoveFileExW(oldbuf, newbuf, flags)) {

		razor_set_error_mswin(error, newbuf, GetLastError());

		retval = -1;

	}

	free(newbuf);

	free(oldbuf);

#else

	int code;

	const char *object;

	if (rename(path, dest)) {

		if (error) {

			code = errno;

			if (access(path, F_OK) < 0)

				object = path;

			else

				object = dest;

			razor_set_error(error, RAZOR_POSIX_ERROR, code, object, 

					strerror(code));

		}

		retval = -1;

	}

#endif

	return retval;

}

#ifndef MSWIN_API

static char *absolute_path(const char *path)

{

	int len;

	char *result, *subpath, *p, *s, *t;

	result = realpath(path, NULL);

	if (!result && errno == ENOENT) {

		p = strdup(path);

		s = strrchr(p, '/');

		while (s) {

			if (s == p) {

				result = strdup("/");

				break;

			}

			*s = '\0';

			subpath = realpath(p, NULL);

			if (subpath) {

				*s = '/';

				len = strlen(subpath);

				result = malloc(len + strlen(s) + 1);

				memcpy(result, subpath, len);

				strcpy(result + len, s);

				free(subpath);

				break;

			} else if (errno != ENOENT)

				break;

			t = strrchr(p, '/');

			*s = '/';

			s = t;

		}

		if (!s)

			result = realpath(".", NULL);

		free(p);

	}

	return result;

}

#endif

int razor_file_is_directory(const char *path, struct razor_error **error)

{

	struct stat st;

	if (stat(path, &st) < 0) {

		razor_set_error_posix(error, path);

		return -1;

	}

	return !!S_ISDIR(st.st_mode);

}

char *razor_file_mkdtemp_near(const char *path, const char *template,

			      struct razor_error **error)

{

	char *retval;

#ifdef MSWIN_API

	if (path[0]=='\\' && path[1]=='\\' && path[2] && path[2]!='\\'

	    && strchr(path+3,'\\')) {

		/* We have a UNC path: \\servername\sharename... */

		const char *sharename, *root;

		int disklen;

		sharename = strchr(path+3,'\\')+1;

		root = strchr(sharename,'\\');

		if (root)

		    disklen = root - path;

		else

		    disklen = strlen(path);

		retval = malloc(disklen + 1 + strlen(template) + 1);

		memcpy(retval, path, disklen);

		retval[disklen] = '\\';

		strcpy(retval + disklen + 1, template);

	} else if ((*path>='A' && *path<='Z' || *path>='a' && *path<='z') &&

		    path[1]==':') {

		retval = malloc(3 + strlen(template) + 1);

		retval[0] = path[0];

		retval[1] = ':';

		retval[2] = '\\';

		strcpy(retval + 3, template);

	} else {

		DWORD n;

		wchar_t *buf;

		char *dir;

		n = GetCurrentDirectoryW(0, NULL);

		buf = malloc(n * sizeof(wchar_t));

		if (GetCurrentDirectoryW(n, buf)) {

			dir = razor_utf16_to_utf8(buf, n - 1);

			free(buf);

			retval = razor_file_mkdtemp_near(dir, template, error);

			free(dir);

			return retval;

		} else {

			retval = malloc(3 + strlen(template) + 1);

			retval[0] = 'C';

			retval[1] = ':';

			retval[2] = '\\';

			strcpy(retval + 3, template);

		}

		free(buf);

	}

#else

	/*

	 * Find the mount point (assuming we can write to the

	 * whole filesystem). Otherwise stop at the first

	 * unwritable directory and take one step back.

	 */

	char *s, *abspath, saved;

	int len, can_step_back = 0;

	dev_t filesystem;

	struct stat buf;

	abspath = absolute_path(path);

	if (!abspath) {

		razor_set_error_posix(error, path);

		return NULL;

	}

	if (stat(abspath, &buf) < 0) {

		if (errno == ENOENT)

			filesystem = 0;

		else {

			razor_set_error_posix(error, abspath);

			free(abspath);

			return NULL;

		}

	} else

		filesystem = buf.st_dev;

	len = strlen(abspath);

	while(len > 1 && (s = strrchr(abspath, '/'))) {

		if (s == abspath) {

			saved = s[1];

			s[1] = '\0';

			len = s + 1 - abspath;

		} else {

			s[0] = '\0';

			len = s - abspath;

		}

		if (stat(abspath, &buf) < 0) {

			if (errno == ENOENT)

				continue;

			else {

			    razor_set_error_posix(error, abspath);

			    free(abspath);

			    return NULL;

			}

		} else if (!filesystem)

			filesystem = buf.st_dev;

		if (buf.st_dev != filesystem || access(abspath, W_OK)) {

			if (can_step_back) {

				if (s == abspath)

					s[1] = saved;

				else

					s[0] = '/';

			}

			len = strlen(abspath);

			break;

		} else

			can_step_back = 1;

	}

	if (len == 1)

		len = 0;	/* Avoid an unslightly double slash. */

	retval = malloc(len + 1 + strlen(template) + 1);

	memcpy(retval, abspath, len);

	retval[len] = '/';

	strcpy(retval + len + 1, template);

	free(abspath);

#endif

	if (!mkdtemp(retval)) {

		int err = errno;

#ifdef EACCES

		if (err == EACCES) {

			char *s = strdup(template);

#ifndef MSWIN_API

			if (stat(".", &buf) < 0) {

				razor_set_error_posix(error, ".");

				free(s);

				free(retval);

				return NULL;

			}

			if (buf.st_dev != filesystem)

				/*

				 * Don't use a different filesystem. It will

				 * only fail later on (in rename) and cause

				 * an unhelpful error message (EXDEV).

				 */

				free(s);

			else

#endif

			if (mkdtemp(s)) {

				free(retval);

				retval = s;

				return retval;

			} else

				free(s);

		}

#endif

		razor_set_error(error, RAZOR_POSIX_ERROR, err, retval,

				strerror(err));

		free(retval);

		retval = NULL;

	}

	return retval;

}

struct open_dir {

	uint32_t flags;

#ifdef MSWIN_API

	_WDIR *dp;

	wchar_t *path2;

#else

	DIR *dp;

	char *path;

#endif

};

#define OPEN_DIR_USED		(1U<<0)

struct array open_dirs = { 0, };

void *razor_file_opendir(const char *path, struct razor_error **error)

{

	struct open_dir *od, *odend;

	odend = open_dirs.data + open_dirs.size;

	for (od = open_dirs.data; od < odend; od++)

		if (!(od->flags & OPEN_DIR_USED))

			break;

	if (od == odend) {

		od = array_add(&open_dirs, sizeof *od);

		od->flags = 0;

	}

#ifdef MSWIN_API

	od->path2 = razor_utf8_to_utf16(path, -1);

	od->dp = _wopendir(od->path2);

#else

	od->path = strdup(path);

	od->dp = opendir(od->path);

#endif

	if (!od->dp) {

#ifdef MSWIN_API

		razor_set_error_mswin(error, od->path2, GetLastError());

		free(od->path2);

#else

		razor_set_error_posix(error, od->path);

		free(od->path);

#endif

		return NULL;

	}

	od->flags = OPEN_DIR_USED;

	return od;

}

char *razor_file_readdir(void *dp, struct razor_error **error)

{

	struct open_dir *od = dp, *odend;

#ifdef MSWIN_API

	struct _wdirent *dirp;

	char *path;

#else

	struct dirent *dirp;

#endif

	odend = open_dirs.data + open_dirs.size;

	if (dp < open_dirs.data || od >= odend || !(od->flags & OPEN_DIR_USED))

		return (char *)-1;

	errno = 0;

#ifdef MSWIN_API

	while((dirp = _wreaddir(od->dp))) {

		path = razor_utf16_to_utf8(dirp->d_name, -1);

		if (strcmp(path, ".") && strcmp(path, ".."))

			return path;

		else

			free(path);

	}

#else

	while((dirp = readdir(od->dp)))

		if (strcmp(dirp->d_name, ".") && strcmp(dirp->d_name, ".."))

			return strdup(dirp->d_name);

#endif

	if (errno) {

#ifdef MSWIN_API

		razor_set_error_mswin(error, od->path2, GetLastError());

#else

		razor_set_error_posix(error, od->path);

#endif

	}

	return NULL;

}

int razor_file_closedir(void *dp, struct razor_error **error)

{

	struct open_dir *od = dp, *odend;

	int retval;

	odend = open_dirs.data + open_dirs.size;

	if (dp < open_dirs.data || od >= odend || !(od->flags & OPEN_DIR_USED))

		return -2;

#ifdef MSWIN_API

	/*

	 * I can't find documentation to state that _wclosedir()

	 * returns -1 on failure, so be paranoid.

	 */

	retval = _wclosedir(od->dp) ? -1 : 0;

#else

	retval = closedir(od->dp);

#endif

	if (retval) {

#ifdef MSWIN_API

		razor_set_error_mswin(error, od->path2, GetLastError());

#else

		razor_set_error_posix(error, od->path);

#endif

	}

#ifdef MSWIN_API

	free(od->path2);

#else

	free(od->path);

#endif

	od->flags &= ~OPEN_DIR_USED;

	for (od = open_dirs.data; od < odend; od++)

		if (od->flags & OPEN_DIR_USED)

			break;

	if (od == odend) {

		array_release(&open_dirs);

		array_init(&open_dirs);

	}

	return retval;

}

struct razor_uri_vtable_entry {

	struct razor_uri_vtable vtable;

	char *scheme;

	struct array open_files, open_directories;

};

static struct array razor_uri_vtable_entries;

static struct razor_uri_vtable_entry *

  razor_uri_get_vtable_entry(const char *scheme)

{

	struct razor_uri_vtable_entry *entry, *eend, *fallback = NULL;

	eend = razor_uri_vtable_entries.data + razor_uri_vtable_entries.size;

	for(entry = razor_uri_vtable_entries.data; entry < eend; entry++) {

		if (!strcmp0(entry->scheme, scheme))

			return entry;

		else if (!entry->scheme)

			fallback = entry;

	}

	return fallback;

}

RAZOR_EXPORT int

razor_uri_mkdir(const char *uri, mode_t mode, struct razor_error **error)

{

	int retval;

	char *path;

	struct razor_uri ru;

	struct razor_uri_vtable_entry *entry;

	struct razor_error *tmp_error = NULL;

	if (razor_uri_parse(&ru, uri, error))

		return -1;

	path = razor_path_from_parsed_uri(&ru, &tmp_error);

	if (razor_error_matches(tmp_error, RAZOR_GENERAL_ERROR,

	    RAZOR_GENERAL_ERROR_UNSUPPORTED_URI))

		razor_error_free(tmp_error);

	else if (!path) {

		razor_propagate_error(error, tmp_error, NULL);

		razor_uri_destroy(&ru);

		return -1;

	}

	if (path) {

		razor_uri_destroy(&ru);

		retval = razor_file_mkdir(path, mode, error);

		free(path);

	} else {

		entry = razor_uri_get_vtable_entry(ru.scheme);

		razor_uri_destroy(&ru);

		if (!entry || !entry->vtable.mkdir) {

			retval = -1;

			razor_set_error(error, RAZOR_GENERAL_ERROR,

					RAZOR_GENERAL_ERROR_UNSUPPORTED_URI,

					uri, "No URI handler installed");

		} else

			retval = entry->vtable.mkdir(uri, mode, error);

	}

	return retval;

}

RAZOR_EXPORT int

razor_uri_unlink(const char *uri, struct razor_error **error)

{

	int retval;

	char *path;

	struct razor_uri ru;

	struct razor_uri_vtable_entry *entry;

	struct razor_error *tmp_error = NULL;

	if (razor_uri_parse(&ru, uri, error))

		return -1;

	path = razor_path_from_parsed_uri(&ru, &tmp_error);

	if (razor_error_matches(tmp_error, RAZOR_GENERAL_ERROR,

	    RAZOR_GENERAL_ERROR_UNSUPPORTED_URI))

		razor_error_free(tmp_error);

	else if (!path) {

		razor_propagate_error(error, tmp_error, NULL);

		razor_uri_destroy(&ru);

		return -1;

	}

	if (path) {

		razor_uri_destroy(&ru);

		retval = razor_file_unlink(path, error);

		free(path);

	} else {

		entry = razor_uri_get_vtable_entry(ru.scheme);

		razor_uri_destroy(&ru);

		if (!entry || !entry->vtable.unlink) {

			retval = -1;

			razor_set_error(error, RAZOR_GENERAL_ERROR,

					RAZOR_GENERAL_ERROR_UNSUPPORTED_URI,

					uri, "No URI handler installed");

		} else

			retval = entry->vtable.unlink(uri, error);

	}

	return retval;

}

RAZOR_EXPORT int

razor_uri_open(const char *uri, int flags, mode_t mode,

	       struct razor_error **error)

{

	int retval;

	char *path;

	struct razor_uri ru;

	struct razor_uri_vtable_entry *entry;

	struct razor_error *tmp_error = NULL;

	if (razor_uri_parse(&ru, uri, error))

		return -1;

	path = razor_path_from_parsed_uri(&ru, &tmp_error);

	if (razor_error_matches(tmp_error, RAZOR_GENERAL_ERROR,

	    RAZOR_GENERAL_ERROR_UNSUPPORTED_URI))

		razor_error_free(tmp_error);

	else if (!path) {

		razor_propagate_error(error, tmp_error, NULL);

		razor_uri_destroy(&ru);

		return -1;

	}

	if (path) {

		razor_uri_destroy(&ru);

		retval = razor_file_open(path, flags, mode, error);

		free(path);

	} else {

		entry = razor_uri_get_vtable_entry(ru.scheme);

		razor_uri_destroy(&ru);

		if (!entry || !entry->vtable.open) {

			retval = -1;

			razor_set_error(error, RAZOR_GENERAL_ERROR,

					RAZOR_GENERAL_ERROR_UNSUPPORTED_URI,

					uri, "No URI handler installed");

		} else

			retval = entry->vtable.open(uri, flags, mode, error);

	}

	return retval;

}

RAZOR_EXPORT int

razor_uri_move(const char *src_uri, const char *dst_uri,

	       struct razor_error **error)

{

	int retval;

	char *src_path, *dst_path;

	struct razor_uri src_ru, dst_ru;

	struct razor_uri_vtable_entry *entry;

	struct razor_error *tmp_error = NULL;

	if (razor_uri_parse(&src_ru, src_uri, error) ||

	    razor_uri_parse(&dst_ru, dst_uri, error))

		return -1;

	src_path = razor_path_from_parsed_uri(&src_ru, &tmp_error);

	if (razor_error_matches(tmp_error, RAZOR_GENERAL_ERROR,

	    RAZOR_GENERAL_ERROR_UNSUPPORTED_URI))

		razor_error_free(tmp_error);

	else if (!src_path) {

		razor_propagate_error(error, tmp_error, NULL);

		razor_uri_destroy(&src_ru);

		return -1;

	}

	dst_path = razor_path_from_parsed_uri(&dst_ru, &tmp_error);

	if (razor_error_matches(tmp_error, RAZOR_GENERAL_ERROR,

	    RAZOR_GENERAL_ERROR_UNSUPPORTED_URI))

		razor_error_free(tmp_error);

	else if (!dst_path) {

		razor_propagate_error(error, tmp_error, NULL);

		razor_uri_destroy(&dst_ru);

		razor_uri_destroy(&src_ru);

		free(src_path);

		return -1;

	}