appfsd
appfsd.o
appfsd.tcl.h
sha1.o
sha1.tcl.h

TCLCONFIG_SH_PATH = $(shell echo 'puts [::tcl::pkgconfig get libdir,install]' | tclsh)/tclConfig.sh
endif
TCL_CFLAGS = $(shell . $(TCLCONFIG_SH_PATH); echo "$${TCL_INCLUDE_SPEC}")
TCL_LIBS = $(shell . $(TCLCONFIG_SH_PATH); echo "$${TCL_LIB_SPEC}")

all: appfsd

appfsd: appfsd.o
	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o appfsd appfsd.o $(LIBS)
appfsd: appfsd.o sha1.o
	$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o appfsd appfsd.o sha1.o $(LIBS)

appfsd.o: appfsd.c appfsd.tcl.h
	$(CC) $(CPPFLAGS) $(CFLAGS) -o appfsd.o -c appfsd.c

sha1.o: sha1.c sha1.tcl.h
	$(CC) $(CPPFLAGS) $(CFLAGS) -o sha1.o -c sha1.c

appfsd.tcl.h: appfsd.tcl sha1.tcl
	sed '/@@SHA1\.TCL@@/ r sha1.tcl' appfsd.tcl | sed '/@@SHA1\.TCL@@/ d' | sed 's@[\\"]@\\&@g;s@^@   "@;s@$$@\\n"@' > appfsd.tcl.h.new
	mv appfsd.tcl.h.new appfsd.tcl.h
%.tcl.h: %.tcl
	sed 's@[\\"]@\\&@g;s@^@   "@;s@$$@\\n"@' $^ > $@.new
	mv $@.new $@

install: appfsd
	if [ ! -d '$(DESTDIR)$(sbindir)' ]; then mkdir -p '$(DESTDIR)$(sbindir)'; chmod 755 '$(DESTDIR)$(sbindir)'; fi
	cp appfsd '$(DESTDIR)$(sbindir)/'

clean:
	rm -f appfsd appfsd.o
	rm -f appfsd.tcl.h
	rm -f sha1.o sha1.tcl.h

distclean: clean

.PHONY: all test clean distclean install

#define FUSE_USE_VERSION 26

#include <sys/types.h>
#include <sqlite3.h>
#include <pthread.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <fuse.h>
#include <pwd.h>
#include <tcl.h>

/* From sha1.c */
int Sha1_Init(Tcl_Interp *interp);

#ifndef APPFS_CACHEDIR
#define APPFS_CACHEDIR "/var/cache/appfs"
#endif

#ifdef DEBUG
#define APPFS_DEBUG(x...) { fprintf(stderr, "[debug] %s:%i:%s: ", __FILE__, __LINE__, __func__); fprintf(stderr, x); fprintf(stderr, "\n"); }
#else
#define APPFS_DEBUG(x...) /**/
#endif

static pthread_key_t interpKey;

struct appfs_thread_data {
	sqlite3 *db;
	const char *cachedir;
	time_t boottime;
	const char *platform;
	struct {
		int writable;
	} options;
};

struct appfs_thread_data globalThread;

		struct {
			off_t size;
			char source[256];
		} symlink;
	} typeinfo;
};

struct appfs_sqlite3_query_cb_handle {
	struct appfs_children *head;
	int argc;
	const char *fmt;
};

static Tcl_Interp *appfs_create_TclInterp(const char *cachedir) {
	Tcl_Interp *interp;
	int tcl_ret;

	APPFS_DEBUG("Creating new Tcl interpreter for TID = 0x%llx", (unsigned long long) pthread_self());

	interp = Tcl_CreateInterp();
	if (interp == NULL) {
		fprintf(stderr, "Unable to create Tcl Interpreter.  Aborting.\n");

		return(NULL);
	}

	tcl_ret = Tcl_Init(interp);
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl.  Aborting.\n");
		fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));

		Tcl_DeleteInterp(interp);

		return(NULL);
	}

	tcl_ret = Tcl_Eval(interp, "package ifneeded sha1 1.0 [list load {} sha1]");
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl SHA1.  Aborting.\n");
		fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));

		Tcl_DeleteInterp(interp);

		return(NULL);
	}

	tcl_ret = Tcl_Eval(interp, "package ifneeded appfsd 1.0 [list load {} appfsd]");
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl AppFS Package.  Aborting.\n");
		fprintf(stderr, "Tcl Error is: %s\n", Tcl_GetStringResult(interp));

		Tcl_DeleteInterp(interp);

		return(NULL);
	}

	tcl_ret = Tcl_Eval(interp, ""

		return;
	}

	return;
}

#define appfs_free_list_type(id, type) static void appfs_free_list_ ## id(type *head) { \
	type *obj, *next; \
	for (obj = head; obj; obj = next) { \
		next = obj->_next; \
		ckfree((void *) obj); \
	} \
}

appfs_free_list_type(children, struct appfs_children)

static uid_t appfs_get_fsuid(void) {
	struct fuse_context *ctx;

	ctx = fuse_get_context();
	if (ctx == NULL) {
		return(1);
	}

	return(ctx->uid);
}

static const char *appfs_get_homedir(uid_t fsuid) {
static char *appfs_get_homedir(uid_t fsuid) {
	struct passwd entry, *result;
	struct stat stbuf;
	char buf[1024], *retval;
	int gpu_ret, stat_ret;

	gpu_ret = getpwuid_r(fsuid, &entry, buf, sizeof(buf), &result);
	if (gpu_ret != 0) {

		    result->pw_dir,
		    (unsigned long long) stbuf.st_uid
		);

		return(NULL);
	}

	retval = sqlite3_mprintf("%s", result->pw_dir);
	retval = strdup(result->pw_dir);

	return(retval);
}

static int appfs_getpackage_name_cb(void *_package_name, int columns, char **values, char **names) {
	char **package_name;

static int tcl_appfs_get_homedir(ClientData cd, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[]) {
	if (columns != 1) {
		return(1);
	}

	package_name = _package_name;

	*package_name = sqlite3_mprintf("%s", values[0]);

	return(0);
}

static char *appfs_getpackage_name(const char *hostname, const char *package_hash) {
	char *sql;
	char *homedir;
	int sqlite_ret;
	char *package_name = NULL;

	sql = sqlite3_mprintf("SELECT package FROM packages WHERE hostname = %Q AND sha1 = %Q LIMIT 1;", hostname, package_hash);
	if (sql == NULL) {
		APPFS_DEBUG("Call to sqlite3_mprintf failed.");

		return(sqlite3_mprintf("%s", "unknown-package-name"));
	}
	sqlite_ret = sqlite3_exec(globalThread.db, sql, appfs_getpackage_name_cb, &package_name, NULL);
	sqlite3_free(sql);

	if (sqlite_ret != SQLITE_OK) {
		APPFS_DEBUG("Call to sqlite3_exec failed.");

		return(sqlite3_mprintf("%s", "unknown-package-name"));
	}

	return(package_name);
}

static struct appfs_children *appfs_getchildren_fs(struct appfs_children *in_children, const char *fspath) {
	APPFS_DEBUG("Searching %s", fspath);

	return(in_children);
}

static int appfs_getchildren_cb(void *_head, int columns, char **values, char **names) {
	struct appfs_children **head_p, *obj;

	head_p = _head;

	obj = (void *) ckalloc(sizeof(*obj));

	snprintf(obj->name, sizeof(obj->name), "%s", values[0]);

	if (*head_p == NULL) {
		obj->counter = 0;
	} else {
		obj->counter = (*head_p)->counter + 1;
	}

	obj->_next = *head_p;
	*head_p = obj;

	return(0);
	
}

static struct appfs_children *appfs_getchildren(const char *hostname, const char *package_hash, const char *path, int *children_count_p) {
	struct appfs_children *head = NULL;
	char *sql, *filebuf, *homedir = NULL;
	int sqlite_ret;
	uid_t fsuid;

	if (children_count_p == NULL) {
		return(NULL);
	}

	appfs_update_index(hostname);
	appfs_update_manifest(hostname, package_hash);

	sql = sqlite3_mprintf("SELECT file_name FROM files WHERE package_sha1 = %Q AND file_directory = %Q;", package_hash, path);
	if (sql == NULL) {
		APPFS_DEBUG("Call to sqlite3_mprintf failed.");

		return(NULL);
	}

	APPFS_DEBUG("SQL: %s", sql);
	sqlite_ret = sqlite3_exec(globalThread.db, sql, appfs_getchildren_cb, &head, NULL);
	sqlite3_free(sql);

	if (sqlite_ret != SQLITE_OK) {
		APPFS_DEBUG("Call to sqlite3_exec failed.");

		appfs_free_list_children(head);

		return(NULL);
	}

	if (globalThread.options.writable) {
		/* Determine user of process accessing this file */
		fsuid = appfs_get_fsuid();

		/* Check filesystem paths for updated files */
		/** Check the global directory (/etc) **/
		filebuf = sqlite3_mprintf("/etc/appfs/%z@%s/%s", appfs_getpackage_name(hostname, package_hash), hostname, path);
		if (filebuf == NULL) {
			APPFS_DEBUG("Call to sqlite3_mprintf failed.");

			return(NULL);
		}

        if (objc != 1) {
		head = appfs_getchildren_fs(head, filebuf);

                Tcl_WrongNumArgs(interp, 1, objv, NULL);
		sqlite3_free(filebuf);

		/** Check the user's directory, if we are not root **/
		if (fsuid != 0) {
			homedir = (char *) appfs_get_homedir(fsuid);
		}

		if (homedir != NULL) {
			filebuf = sqlite3_mprintf("%z/.appfs/%z@%s/%s", homedir, appfs_getpackage_name(hostname, package_hash), hostname, path);

			if (filebuf == NULL) {
				APPFS_DEBUG("Call to sqlite3_mprintf failed.");

				return(NULL);
			}

			head = appfs_getchildren_fs(head, filebuf);

			sqlite3_free(filebuf);
		}
	}

	if (head != NULL) {
		*children_count_p = head->counter + 1;
	} else {
		*children_count_p = 0;
	}

	return(head);
}

static int appfs_sqlite3_query_cb(void *_cb_handle, int columns, char **values, char **names) {
	struct appfs_sqlite3_query_cb_handle *cb_handle;
	struct appfs_children *obj;

	cb_handle = _cb_handle;

	obj = (void *) ckalloc(sizeof(*obj));

	switch (cb_handle->argc) {
		case 1:
			snprintf(obj->name, sizeof(obj->name), cb_handle->fmt, values[0]);
			break;
		case 2:
			snprintf(obj->name, sizeof(obj->name), cb_handle->fmt, values[0], values[1]);
			break;
		case 3:
			snprintf(obj->name, sizeof(obj->name), cb_handle->fmt, values[0], values[1], values[2]);
			break;
		case 4:
			snprintf(obj->name, sizeof(obj->name), cb_handle->fmt, values[0], values[1], values[2], values[3]);
			break;
	}

	if (cb_handle->head == NULL) {
		obj->counter = 0;
	} else {
		obj->counter = cb_handle->head->counter + 1;
	}

	obj->_next = cb_handle->head;
	cb_handle->head = obj;

	return(0);
}
                return(TCL_ERROR);
        }

static struct appfs_children *appfs_sqlite3_query(char *sql, int argc, const char *fmt, int *results_count_p) {
	struct appfs_sqlite3_query_cb_handle cb_handle;
	int sqlite_ret;

	homedir = appfs_get_homedir(appfs_get_fsuid());
	if (results_count_p == NULL) {
		return(NULL);
	}

	if (sql == NULL) {
		APPFS_DEBUG("Call to sqlite3_mprintf probably failed.");

		return(NULL);
	}

	if (fmt == NULL) {
		fmt = "%s";
	}

	cb_handle.head = NULL;
	cb_handle.argc = argc;
	cb_handle.fmt  = fmt;

	APPFS_DEBUG("SQL: %s", sql);
	sqlite_ret = sqlite3_exec(globalThread.db, sql, appfs_sqlite3_query_cb, &cb_handle, NULL);
	sqlite3_free(sql);

	if (sqlite_ret != SQLITE_OK) {
		APPFS_DEBUG("Call to sqlite3_exec failed.");

		return(NULL);
	}

	if (cb_handle.head != NULL) {
		*results_count_p = cb_handle.head->counter + 1;
	}


	return(cb_handle.head);
}

static int appfs_lookup_package_hash_cb(void *_retval, int columns, char **values, char **names) {
	char **retval = _retval;

	*retval = strdup(values[0]);

	return(0);
}

static char *appfs_lookup_package_hash(const char *hostname, const char *package, const char *os, const char *cpuArch, const char *version) {
	char *sql;
	char *retval = NULL;
	int sqlite_ret;

	appfs_update_index(hostname);

	sql = sqlite3_mprintf("SELECT sha1 FROM packages WHERE hostname = %Q AND package = %Q AND os = %Q AND cpuArch = %Q AND version = %Q;",
		hostname,
		package,
		os,
		cpuArch,
		version
	);
	if (sql == NULL) {
	if (homedir == NULL) {
		APPFS_DEBUG("Call to sqlite3_mprintf failed.");

		return(NULL);
	}

	APPFS_DEBUG("SQL: %s", sql);
	sqlite_ret = sqlite3_exec(globalThread.db, sql, appfs_lookup_package_hash_cb, &retval, NULL);
	sqlite3_free(sql);

	if (sqlite_ret != SQLITE_OK) {
		APPFS_DEBUG("Call to sqlite3_exec failed.");

		return(NULL);
	}

	return(retval);
}

static int appfs_getfileinfo_cb(void *_pathinfo, int columns, char **values, char **names) {
	struct appfs_pathinfo *pathinfo = _pathinfo;
	const char *type, *time, *source, *size, *perms, *sha1, *rowid;

	type = values[0];
	time = values[1];
	source = values[2];
	size = values[3];
	perms = values[4];
	sha1 = values[5];
	rowid = values[6];

	pathinfo->time = strtoull(time, NULL, 10);

	/* Package file inodes start at 2^32, fake inodes are before then */
	pathinfo->inode = strtoull(rowid, NULL, 10) + 4294967296ULL;

	if (strcmp(type, "file") == 0) {
		pathinfo->type = APPFS_PATHTYPE_FILE;

		if (!size) {
			size = "0";
		}

		if (!perms) {
			perms = "";
		}

		if (!sha1) {
			sha1 = "";
		}

		pathinfo->typeinfo.file.size = strtoull(size, NULL, 10);
		snprintf(pathinfo->typeinfo.file.sha1, sizeof(pathinfo->typeinfo.file.sha1), "%s", sha1);

		if (strcmp(perms, "x") == 0) {
			pathinfo->typeinfo.file.executable = 1;
		} else {
			pathinfo->typeinfo.file.executable = 0;
		}

		return(0);
		return(TCL_ERROR);
	}

	if (strcmp(type, "directory") == 0) {
		pathinfo->type = APPFS_PATHTYPE_DIRECTORY;
		pathinfo->typeinfo.dir.childcount = 0;

        Tcl_SetObjResult(interp, Tcl_NewStringObj(homedir, -1));
		return(0);
	}


	free(homedir);
	if (strcmp(type, "symlink") == 0) {
		pathinfo->type = APPFS_PATHTYPE_SYMLINK;
		pathinfo->typeinfo.dir.childcount = 0;

		if (!source) {
			source = ".BADLINK";
		}

		pathinfo->typeinfo.symlink.size = strlen(source);
		snprintf(pathinfo->typeinfo.symlink.source, sizeof(pathinfo->typeinfo.symlink.source), "%s", source);

		return(0);
	}
        return(TCL_OK);
}

	return(0);

	/* Until this is used, prevent the compiler from complaining */
	source = source;
}

static int appfs_getfileinfo(const char *hostname, const char *package_hash, const char *_path, struct appfs_pathinfo *pathinfo) {
static struct appfs_children *appfs_getchildren(const char *hostname, const char *package_hash, const char *path, int *children_count_p) {
	char *directory, *file, *path;
	char *sql;
	int sqlite_ret;

}
	if (pathinfo == NULL) {
		return(-EIO);
	}


static char *appfs_lookup_package_hash(const char *hostname, const char *package, const char *os, const char *cpuArch, const char *version) {
	appfs_update_index(hostname);
	appfs_update_manifest(hostname, package_hash);

}
	path = strdup(_path);
	directory = path;
	file = strrchr(path, '/');
	if (file == NULL) {
		file = path;
		directory = "";
	} else {
		*file = '\0';
		file++;
	}


static int appfs_getfileinfo(const char *hostname, const char *package_hash, const char *_path, struct appfs_pathinfo *pathinfo) {
	sql = sqlite3_mprintf("SELECT type, time, source, size, perms, file_sha1, rowid FROM files WHERE package_sha1 = %Q AND file_directory = %Q AND file_name = %Q;", package_hash, directory, file);
	if (sql == NULL) {
		APPFS_DEBUG("Call to sqlite3_mprintf failed.");

		free(path);

		return(-EIO);
	}

	free(path);

	pathinfo->type = APPFS_PATHTYPE_INVALID;

	APPFS_DEBUG("SQL: %s", sql);
	sqlite_ret = sqlite3_exec(globalThread.db, sql, appfs_getfileinfo_cb, pathinfo, NULL);
	sqlite3_free(sql);

	if (sqlite_ret != SQLITE_OK) {
		APPFS_DEBUG("Call to sqlite3_exec failed.");

		return(-EIO);
	}

	if (pathinfo->type == APPFS_PATHTYPE_INVALID) {
		return(-ENOENT);
	}

	return(0);
}

static int appfs_get_path_info_sql(char *sql, int argc, const char *fmt, struct appfs_pathinfo *pathinfo, struct appfs_children **children) {
	struct appfs_children *node, *dir_children, *dir_child;
	int dir_children_count = 0;

	dir_children = appfs_sqlite3_query(sql, argc, fmt, &dir_children_count);

	if (dir_children == NULL || dir_children_count == 0) {
		return(-ENOENT);
	}

	/* Request for a single hostname */
	pathinfo->type = APPFS_PATHTYPE_DIRECTORY;
	pathinfo->typeinfo.dir.childcount = dir_children_count;
	pathinfo->time = globalThread.boottime;

	if (children) {
		for (dir_child = dir_children; dir_child; dir_child = dir_child->_next) {
			node = (void *) ckalloc(sizeof(*node));
			node->_next = *children;
			strcpy(node->name, dir_child->name);
			*children = node;
		}
	}

	appfs_free_list_children(dir_children);

	return(0);
}

static int appfs_add_path_child(const char *name, struct appfs_pathinfo *pathinfo, struct appfs_children **children) {
	struct appfs_children *new_child;

	pathinfo->typeinfo.dir.childcount++;

	if (children) {
		new_child = (void *) ckalloc(sizeof(*new_child));
		new_child->_next = *children;

		snprintf(new_child->name, sizeof(new_child->name), "%s", name);

		*children = new_child;
	}

	return(0);
}

/* Generate an inode for a given path */
static long long appfs_get_path_inode(const char *path) {
	long long retval;
	const char *p;

	retval %= 4294967296ULL;

	return(retval);
}

/* Get information about a path, and optionally list children */
static int appfs_get_path_info(const char *_path, struct appfs_pathinfo *pathinfo, struct appfs_children **children) {
	struct appfs_children *dir_children;
	char *hostname, *packagename, *os_cpuArch, *os, *cpuArch, *version;
	char *path, *path_s;
	char *package_hash;
	char *sql;
	int files_count;
	int fileinfo_ret, retval;

	/* Initialize return */
	if (children) {
		*children = NULL;
	}

	/* Verify that this is a valid request */
	if (_path == NULL) {
		return(-ENOENT);
	}

	if (_path[0] != '/') {
		return(-ENOENT);
	}

	/* Note that this is not a "real" directory from a package */
	pathinfo->packaged = 0;

	if (_path[1] == '\0') {
		/* Request for the root directory */
		pathinfo->hostname[0] = '\0';
		pathinfo->inode = 1;

		sql = sqlite3_mprintf("SELECT DISTINCT hostname FROM packages;");

		retval = appfs_get_path_info_sql(sql, 1, NULL, pathinfo, children);

		/* The root directory always exists, even if it has no subordinates */
		if (retval != 0) {
			pathinfo->type = APPFS_PATHTYPE_DIRECTORY;
			pathinfo->typeinfo.dir.childcount = 0;
			pathinfo->time = globalThread.boottime;

			retval = 0;
		}

		return(retval);
	}

	path = strdup(_path);
	path_s = path;

	pathinfo->inode = appfs_get_path_inode(path);

	hostname = path + 1;
	packagename = strchr(hostname, '/');

	if (packagename != NULL) {
		*packagename = '\0';
		packagename++;
	}

	snprintf(pathinfo->hostname, sizeof(pathinfo->hostname), "%s", hostname);

	if (packagename == NULL) {
		appfs_update_index(hostname);

		sql = sqlite3_mprintf("SELECT DISTINCT package FROM packages WHERE hostname = %Q;", hostname);

		free(path_s);

		return(appfs_get_path_info_sql(sql, 1, NULL, pathinfo, children));
	}

	os_cpuArch = strchr(packagename, '/');

	if (os_cpuArch != NULL) {
		*os_cpuArch = '\0';
		os_cpuArch++;
	}

	if (os_cpuArch == NULL) {
		appfs_update_index(hostname);

		sql = sqlite3_mprintf("SELECT DISTINCT os, cpuArch FROM packages WHERE hostname = %Q AND package = %Q;", hostname, packagename);

		free(path_s);

		retval = appfs_get_path_info_sql(sql, 2, "%s-%s", pathinfo, children);

		if (retval != 0) {
			return(retval);
		}

		appfs_add_path_child("platform", pathinfo, children);

		return(retval);
	}

	version = strchr(os_cpuArch, '/');

	if (version != NULL) {
		*version = '\0';
		version++;
	}

	os = os_cpuArch;
	cpuArch = strchr(os_cpuArch, '-');
	if (cpuArch) {
		*cpuArch = '\0';
		cpuArch++;
	} else {
		cpuArch = "";
	}

	if (version == NULL) {
		if (strcmp(os, "platform") == 0 && strcmp(cpuArch, "") == 0) {
			pathinfo->type = APPFS_PATHTYPE_SYMLINK;
			pathinfo->time = globalThread.boottime;
			pathinfo->typeinfo.dir.childcount = 0;
			pathinfo->typeinfo.symlink.size = strlen(globalThread.platform);

			snprintf(pathinfo->typeinfo.symlink.source, sizeof(pathinfo->typeinfo.symlink.source), "%s", globalThread.platform);

			free(path_s);

			return(0);
		}

		/* Request for version list for a package on an OS/CPU */
		appfs_update_index(hostname);

		sql = sqlite3_mprintf("SELECT DISTINCT version FROM packages WHERE hostname = %Q AND package = %Q AND os = %Q and cpuArch = %Q;", hostname, packagename, os, cpuArch);

		free(path_s);

		return(appfs_get_path_info_sql(sql, 1, NULL, pathinfo, children));
	}

	path = strchr(version, '/');
	if (path == NULL) {
		path = "";
	} else {
		*path = '\0';
		path++;
	}

	/* Request for a file in a specific package */
	pathinfo->packaged = 1;
	APPFS_DEBUG("Requesting information for hostname = %s, package = %s, os = %s, cpuArch = %s, version = %s, path = %s", 
		hostname, packagename, os, cpuArch, version, path
	);

	package_hash = appfs_lookup_package_hash(hostname, packagename, os, cpuArch, version);
	if (package_hash == NULL) {
		free(path_s);

		return(-ENOENT);
	}

	APPFS_DEBUG("  ... which hash a hash of %s", package_hash);

	appfs_update_manifest(hostname, package_hash);

	if (strcmp(path, "") == 0) {
		pathinfo->type = APPFS_PATHTYPE_DIRECTORY;
		pathinfo->time = globalThread.boottime;
	} else {
		fileinfo_ret = appfs_getfileinfo(hostname, package_hash, path, pathinfo);
		if (fileinfo_ret != 0) {
			free(path_s);

			return(fileinfo_ret);
		}
	}

	if (pathinfo->type == APPFS_PATHTYPE_DIRECTORY) {
		dir_children = appfs_getchildren(hostname, package_hash, path, &files_count);

		if (dir_children != NULL) {
			pathinfo->typeinfo.dir.childcount = files_count;
		}

		if (children) {
			*children = dir_children;
		} else {
			appfs_free_list_children(dir_children);
		}
	}

	free(path_s);

	return(0);
}

static int appfs_fuse_readlink(const char *path, char *buf, size_t size) {
	struct appfs_pathinfo pathinfo;
	int res = 0;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	pathinfo.type = APPFS_PATHTYPE_INVALID;

	res = appfs_get_path_info(path, &pathinfo, NULL);
	if (res != 0) {
		return(res);
	}

	if (pathinfo.type != APPFS_PATHTYPE_SYMLINK) {
		return(-EINVAL);
	}

	if ((strlen(pathinfo.typeinfo.symlink.source) + 1) > size) {
		return(-ENAMETOOLONG);
	}

	memcpy(buf, pathinfo.typeinfo.symlink.source, strlen(pathinfo.typeinfo.symlink.source) + 1);

	return(0);
}

static int appfs_fuse_getattr(const char *path, struct stat *stbuf) {
	struct appfs_pathinfo pathinfo;
	int res = 0;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	.getattr   = appfs_fuse_getattr,
	.readdir   = appfs_fuse_readdir,
	.readlink  = appfs_fuse_readlink,
	.open      = appfs_fuse_open,
	.release   = appfs_fuse_close,
	.read      = appfs_fuse_read
};

int Appfsd_Init(Tcl_Interp *interp) {
#ifdef USE_TCL_STUBS
	if (Tcl_InitStubs(interp, TCL_VERSION, 0) == 0L) {
		return(TCL_ERROR);
	}
#endif

	Tcl_CreateObjCommand(interp, "appfsd::get_homedir", tcl_appfs_get_homedir, NULL, NULL);

	Tcl_PkgProvide(interp, "appfsd", "1.0");

	return(TCL_OK);
}

int main(int argc, char **argv) {
	const char *cachedir = APPFS_CACHEDIR;
	char dbfilename[1024];
	int pthread_ret, snprintf_ret, sqlite_ret;
	int pthread_ret, snprintf_ret;

	globalThread.cachedir = cachedir;
	globalThread.boottime = time(NULL);
	globalThread.platform = "linux-x86_64";
	globalThread.options.writable = 1;

	Tcl_StaticPackage(NULL, "sha1", Sha1_Init, NULL);
	Tcl_StaticPackage(NULL, "appfsd", Appfsd_Init, NULL);

	pthread_ret = pthread_key_create(&interpKey, NULL);
	if (pthread_ret != 0) {
		fprintf(stderr, "Unable to create TSD key for Tcl.  Aborting.\n");

		return(1);
	}

	snprintf_ret = snprintf(dbfilename, sizeof(dbfilename), "%s/%s", cachedir, "cache.db");
	if (snprintf_ret >= sizeof(dbfilename)) {
		fprintf(stderr, "Unable to set database filename.  Aborting.\n");

		return(1);
	}

	sqlite_ret = sqlite3_open(dbfilename, &globalThread.db);
	if (sqlite_ret != SQLITE_OK) {
		fprintf(stderr, "Unable to open database: %s\n", dbfilename);

		return(1);
	}

	return(fuse_main(argc, argv, &appfs_oper, NULL));
}
 

#! /usr/bin/env tclsh

package require http 2.7
package require sqlite3

if {[catch {
	package require sha1
package require sha1
}]} {
	@@SHA1.TCL@@
	package require sha1
}

namespace eval ::appfs {
	variable cachedir "/tmp/appfs-cache"
	variable ttl 3600
	variable nttl 60

	proc _hash_sep {hash {seps 4}} {

/*
	SHA-1 in C
	By Steve Reid <steve@edmweb.com>
	100% Public Domain

Test Vectors (from FIPS PUB 180-1)
"abc"
  A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
  84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
A million repetitions of "a"
  34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
*/

/* #define LITTLE_ENDIAN * This should be #define'd if true. */
/* #define SHA1HANDSOFF * Copies data before messing with it. */
#include <tcl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <fcntl.h>
#include <stdio.h>

#define SHA1HANDSOFF 1

typedef struct {
	uint32_t state[5];
	uint32_t count[2];
	uint8_t  buffer[64];
} SHA1_CTX;

#ifndef __BIG_ENDIAN
#define __BIG_ENDIAN 4321
#endif
#ifndef __LITTLE_ENDIAN
#define __LITTLE_ENDIAN 1234
#endif

#ifndef __BYTE_ORDER
#ifdef WORDS_BIGENDIAN
#define __BYTE_ORDER __BIG_ENDIAN
#else
#define __BYTE_ORDER __LITTLE_ENDIAN
#endif
#endif

#if __BYTE_ORDER == __BIG_ENDIAN
#ifndef BIG_ENDIAN
#define BIG_ENDIAN 1
#endif
#undef LITTLE_ENDIAN
#else
#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN 1
#endif
#undef BIG_ENDIAN
#endif

#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))

/* blk0() and blk() perform the initial expand. */
/* I got the idea of expanding during the round function from SSLeay */
#ifdef LITTLE_ENDIAN
#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
    |(rol(block->l[i],8)&0x00FF00FF))
#else
#define blk0(i) block->l[i]
#endif
#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
    ^block->l[(i+2)&15]^block->l[i&15],1))

/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);


/* Hash a single 512-bit block. This is the core of the algorithm. */

static void SHA1Transform(uint32_t state[5], uint8_t buffer[64]) {
	uint32_t a, b, c, d, e;
	typedef union {
		uint8_t  c[64];
		uint32_t l[16];
	} CHAR64LONG16;
	CHAR64LONG16* block;
#ifdef SHA1HANDSOFF
	uint8_t workspace[sizeof(*block)];

	block = (CHAR64LONG16*)workspace;
	memcpy(block, buffer, sizeof(*block));
#else
	block = (CHAR64LONG16*)buffer;
#endif

	/* Copy context->state[] to working vars */
	a = state[0];
	b = state[1];
	c = state[2];
	d = state[3];
	e = state[4];

	/* 4 rounds of 20 operations each. Loop unrolled. */
	R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
	R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
	R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
	R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
	R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
	R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
	R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
	R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
	R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
	R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
	R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
	R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
	R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
	R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
	R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
	R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
	R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
	R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
	R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
	R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);

	/* Add the working vars back into context.state[] */
	state[0] += a;
	state[1] += b;
	state[2] += c;
	state[3] += d;
	state[4] += e;

	/* Wipe variables */
	a = b = c = d = e = 0;
}


/* SHA1Init - Initialize new context */
static void SHA1Init(SHA1_CTX* context) {
	/* SHA1 initialization constants */
	context->state[0] = 0x67452301;
	context->state[1] = 0xEFCDAB89;
	context->state[2] = 0x98BADCFE;
	context->state[3] = 0x10325476;
	context->state[4] = 0xC3D2E1F0;
	context->count[0] = 0;
	context->count[1] = 0;
}


/* Run your data through this. */
static void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int len) {
	unsigned int i, j;

	j = (context->count[0] >> 3) & 63;
	if ((context->count[0] += len << 3) < (len << 3)) {
		context->count[1]++;
	}

	context->count[1] += (len >> 29);

	if ((j + len) > 63) {
		memcpy(&context->buffer[j], data, (i = 64-j));
		SHA1Transform(context->state, context->buffer);
		for ( ; i + 63 < len; i += 64) {
			SHA1Transform(context->state, &data[i]);
		}
		j = 0;
	} else {
		i = 0;
	}

	memcpy(&context->buffer[j], &data[i], len - i);
}


/* Add padding and return the message digest. */
static void SHA1Final(unsigned char digest[20], SHA1_CTX* context) {
	unsigned long i;
	unsigned char finalcount[8];

	for (i = 0; i < 8; i++) {
		finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)] >> ((3-(i & 3)) * 8) ) & 255);  /* Endian independent */
	}

	SHA1Update(context, (unsigned char *) "\200", 1);

	while ((context->count[0] & 504) != 448) {
		SHA1Update(context, (unsigned char *)"\0", 1);
	}

	SHA1Update(context, finalcount, 8);  /* Should cause a SHA1Transform() */
	for (i = 0; i < 20; i++) {
		digest[i] = (unsigned char) ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
	}

	/* Wipe variables */
	i = 0;

	memset(context->buffer, 0, 64);
	memset(context->state, 0, 20);
	memset(context->count, 0, 8);
	memset(&finalcount, 0, 8);
#ifdef SHA1HANDSOFF  /* make SHA1Transform overwrite it's own static vars */
	SHA1Transform(context->state, context->buffer);
#endif
}

static Tcl_Obj* c_sha1__sha1_file(char* file) {
	SHA1_CTX ctx;
	unsigned char digest[20];
	unsigned char buf[4096];
	int fd;
	ssize_t read_ret;
	Tcl_Obj *ret;

	fd = open(file, O_RDONLY);
	if (fd < 0) {
		return(NULL);
	}

	SHA1Init(&ctx);

	while (1) {
		read_ret = read(fd, buf, sizeof(buf));

		if (read_ret == 0) {
			break;
		}

		if (read_ret < 0) {
			close(fd);

			return(NULL);
		}

		SHA1Update(&ctx, buf, read_ret);
	}

	close(fd);

	SHA1Final(digest, &ctx);

	ret = Tcl_NewByteArrayObj(digest, sizeof(digest));

	return(ret);
}

static int tcl_sha1__sha1_file(ClientData dummy, Tcl_Interp *ip, int objc, Tcl_Obj *CONST objv[]) {
	char* _file;
	Tcl_Obj* rv;
	if (objc != 2) {
		Tcl_WrongNumArgs(ip, 1, objv, "file");
		return TCL_ERROR;
	}
	_file = Tcl_GetString(objv[1]);

	rv = c_sha1__sha1_file(_file);
	if (rv == NULL) {
		return(TCL_ERROR);
	}
	Tcl_SetObjResult(ip, rv);
	return TCL_OK;
}

static Tcl_Obj* c_sha1__sha1_string(Tcl_Obj* str) {
	SHA1_CTX ctx;
	unsigned char digest[20];
	unsigned char *buf;
	int buf_len;
	Tcl_Obj *ret;

	SHA1Init(&ctx);

	buf = Tcl_GetByteArrayFromObj(str, &buf_len);
	if (buf == NULL) {
		return(NULL);
	}

	SHA1Update(&ctx, buf, buf_len);

	SHA1Final(digest, &ctx);

	ret = Tcl_NewByteArrayObj(digest, sizeof(digest));

	return(ret);
}

static int tcl_sha1__sha1_string(ClientData dummy, Tcl_Interp *ip, int objc, Tcl_Obj *CONST objv[]) {
	Tcl_Obj* _str;
	Tcl_Obj* rv;
	if (objc != 2) {
		Tcl_WrongNumArgs(ip, 1, objv, "str");
		return TCL_ERROR;
	}
	_str = objv[1];

	rv = c_sha1__sha1_string(_str);
	if (rv == NULL) {
		return(TCL_ERROR);
	}
	Tcl_SetObjResult(ip, rv);
	return TCL_OK;
}

int Sha1_Init(Tcl_Interp *interp) {
#ifdef USE_TCL_STUBS
	if (Tcl_InitStubs(interp, TCL_VERSION, 0) == 0L) {
		return TCL_ERROR;
	}
#endif
	Tcl_CreateObjCommand(interp, "sha1::_sha1_file", tcl_sha1__sha1_file, NULL, NULL);
	Tcl_CreateObjCommand(interp, "sha1::_sha1_string", tcl_sha1__sha1_string, NULL, NULL);
	Tcl_Eval(interp,
#include "sha1.tcl.h"
	);
	Tcl_PkgProvide(interp, "sha1", "1.0");
	return(TCL_OK);
}

# sha1.tcl - 

#! /usr/bin/env tclsh
# @@ Meta Begin
# Package sha1 2.0.3
# Meta platform           tcl
# Meta rsk::build::date   2011-03-30
# Meta description        Part of the Tclib sha1 module
# Meta require            {Tcl 8.2}
# @@ Meta End

#
# Copyright (C) 2001 Don Libes <libes@nist.gov>
# Copyright (C) 2003 Pat Thoyts <patthoyts@users.sourceforge.net>
#
# SHA1 defined by FIPS 180-1, "The SHA1 Message-Digest Algorithm"
# HMAC defined by RFC 2104, "Keyed-Hashing for Message Authentication"
#
# This is an implementation of SHA1 based upon the example code given in
# FIPS 180-1 and upon the tcllib MD4 implementation and taking some ideas
# and methods from the earlier tcllib sha1 version by Don Libes.
#
# This implementation permits incremental updating of the hash and 
# provides support for external compiled implementations either using
# critcl (sha1c) or Trf.
#
# ref: http://www.itl.nist.gov/fipspubs/fip180-1.htm
#
# -------------------------------------------------------------------------
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# -------------------------------------------------------------------------
#
# $Id: sha1.tcl,v 1.22 2009/05/07 00:35:10 patthoyts Exp $

proc sha1::sha1 args {
# @mdgen EXCLUDE: sha1c.tcl

	set outputmode "hex"
package require Tcl 8.2;                # tcl minimum version

namespace eval ::sha1 {
    variable  version 2.0.3
    namespace export sha1 hmac SHA1Init SHA1Update SHA1Final
    variable uid
    if {![info exists uid]} {
        set uid 0
    }
}

proc ::sha1::SHA1Init {} {
    variable uid
    set token [namespace current]::[incr uid]
    upvar #0 $token state

    # FIPS 180-1: 7 - Initialize the hash state
    array set state \
        [list \
             A [expr {int(0x67452301)}] \
             B [expr {int(0xEFCDAB89)}] \
             C [expr {int(0x98BADCFE)}] \
             D [expr {int(0x10325476)}] \
             E [expr {int(0xC3D2E1F0)}] \
             n 0 i "" ]
    return $token
}

# SHA1Update --
#
#   This is called to add more data into the hash. You may call this
#   as many times as you require. Note that passing in "ABC" is equivalent
#   to passing these letters in as separate calls -- hence this proc 
#   permits hashing of chunked data
#
#   If we have a C-based implementation available, then we will use
#   it here in preference to the pure-Tcl implementation.
#
proc ::sha1::SHA1Update {token data} {
    upvar #0 $token state

    # Update the state values
    incr state(n) [string length $data]
    append state(i) $data

	if {[lindex $args 0] == "-hex"} {
    # Calculate the hash for any complete blocks
    set len [string length $state(i)]
    for {set n 0} {($n + 64) <= $len} {} {
        SHA1Transform $token [string range $state(i) $n [incr n 64]]
    }

    # Adjust the state for the blocks completed.
    set state(i) [string range $state(i) $n end]
    return
}

# SHA1Final --
#
#    This procedure is used to close the current hash and returns the
#    hash data. Once this procedure has been called the hash context
#    is freed and cannot be used again.
#
#    Note that the output is 160 bits represented as binary data.
#
proc ::sha1::SHA1Final {token} {
    upvar #0 $token state

    # Padding
    #
    set len [string length $state(i)]
    set pad [expr {56 - ($len % 64)}]
    if {$len % 64 > 56} {
        incr pad 64
    }
    if {$pad == 0} {
        incr pad 64
    }
    append state(i) [binary format a$pad \x80]

    # Append length in bits as big-endian wide int.
    set dlen [expr {8 * $state(n)}]
    append state(i) [binary format II 0 $dlen]

    # Calculate the hash for the remaining block.
    set len [string length $state(i)]
    for {set n 0} {($n + 64) <= $len} {} {
        SHA1Transform $token [string range $state(i) $n [incr n 64]]
    }

    # Output
		set outputmode "hex"
    set r [bytes $state(A)][bytes $state(B)][bytes $state(C)][bytes $state(D)][bytes $state(E)]
    unset state
    return $r
}


		set args [lrange $args 1 end]
# -------------------------------------------------------------------------
# HMAC Hashed Message Authentication (RFC 2104)
#
# hmac = H(K xor opad, H(K xor ipad, text))
#

	} elseif {[lindex $args 0] == "-bin"} {
# HMACInit --
#
#    This is equivalent to the SHA1Init procedure except that a key is
#    added into the algorithm
#
proc ::sha1::HMACInit {K} {

		set outputmode "binary"
    # Key K is adjusted to be 64 bytes long. If K is larger, then use
    # the SHA1 digest of K and pad this instead.
    set len [string length $K]
    if {$len > 64} {
        set tok [SHA1Init]
        SHA1Update $tok $K
        set K [SHA1Final $tok]
        set len [string length $K]
    }

    set pad [expr {64 - $len}]
    append K [string repeat \0 $pad]

		set args [lrange $args 1 end]
    # Cacluate the padding buffers.
    set Ki {}
    set Ko {}
    binary scan $K i16 Ks
    foreach k $Ks {
        append Ki [binary format i [expr {$k ^ 0x36363636}]]
        append Ko [binary format i [expr {$k ^ 0x5c5c5c5c}]]
    }
	}

    set tok [SHA1Init]
    SHA1Update $tok $Ki;                 # initialize with the inner pad
    
    # preserve the Ko value for the final stage.
    # FRINK: nocheck
    set [subst $tok](Ko) $Ko

    return $tok
}

# HMACUpdate --
#
#    Identical to calling SHA1Update
#
proc ::sha1::HMACUpdate {token data} {
    SHA1Update $token $data
    return
}

# HMACFinal --
#
#    This is equivalent to the SHA1Final procedure. The hash context is
#    closed and the binary representation of the hash result is returned.
#
proc ::sha1::HMACFinal {token} {
    upvar #0 $token state

    set tok [SHA1Init];                 # init the outer hashing function
    SHA1Update $tok $state(Ko);         # prepare with the outer pad.
    SHA1Update $tok [SHA1Final $token]; # hash the inner result
    return [SHA1Final $tok]
}

# -------------------------------------------------------------------------
# Description:
#  This is the core SHA1 algorithm. It is a lot like the MD4 algorithm but
#  includes an extra round and a set of constant modifiers throughout.
#
set ::sha1::SHA1Transform_body {
    upvar #0 $token state

    # FIPS 180-1: 7a: Process Message in 16-Word Blocks
    binary scan $msg I* blocks
    set blockLen [llength $blocks]
    for {set i 0} {$i < $blockLen} {incr i 16} {
        set W [lrange $blocks $i [expr {$i+15}]]
        
        # FIPS 180-1: 7b: Expand the input into 80 words
        # For t = 16 to 79 
        #   let Wt = (Wt-3 ^ Wt-8 ^ Wt-14 ^ Wt-16) <<< 1
        set t3  12
        set t8   7
        set t14  1
        set t16 -1
        for {set t 16} {$t < 80} {incr t} {
            set x [expr {[lindex $W [incr t3]] ^ [lindex $W [incr t8]] ^ \
                             [lindex $W [incr t14]] ^ [lindex $W [incr t16]]}]
            lappend W [expr {int(($x << 1) | (($x >> 31) & 1))}]
        }
        
        # FIPS 180-1: 7c: Copy hash state.
        set A $state(A)
        set B $state(B)
        set C $state(C)
        set D $state(D)
        set E $state(E)

        # FIPS 180-1: 7d: Do permutation rounds
        # For t = 0 to 79 do
        #   TEMP = (A<<<5) + ft(B,C,D) + E + Wt + Kt;
        #   E = D; D = C; C = S30(B); B = A; A = TEMP;

	if {[llength $args] == 2} {
        # Round 1: ft(B,C,D) = (B & C) | (~B & D) ( 0 <= t <= 19)
        for {set t 0} {$t < 20} {incr t} {
            set TEMP [F1 $A $B $C $D $E [lindex $W $t]]
            set E $D
            set D $C
            set C [rotl32 $B 30]
            set B $A
            set A $TEMP
        }

		set mode [lindex $args 0]
        # Round 2: ft(B,C,D) = (B ^ C ^ D) ( 20 <= t <= 39)
        for {} {$t < 40} {incr t} {
            set TEMP [F2 $A $B $C $D $E [lindex $W $t]]
            set E $D
            set D $C
            set C [rotl32 $B 30]
            set B $A
            set A $TEMP
        }

	} elseif {[llength $args] == 1} {
        # Round 3: ft(B,C,D) = ((B & C) | (B & D) | (C & D)) ( 40 <= t <= 59)
        for {} {$t < 60} {incr t} {
            set TEMP [F3 $A $B $C $D $E [lindex $W $t]]
            set E $D
            set D $C
            set C [rotl32 $B 30]
            set B $A
            set A $TEMP
         }

		set mode "-string"
        # Round 4: ft(B,C,D) = (B ^ C ^ D) ( 60 <= t <= 79)
        for {} {$t < 80} {incr t} {
            set TEMP [F4 $A $B $C $D $E [lindex $W $t]]
            set E $D
            set D $C
            set C [rotl32 $B 30]
            set B $A
            set A $TEMP
        }

	} else {
        # Then perform the following additions. (That is, increment each
        # of the four registers by the value it had before this block
        # was started.)
        incr state(A) $A
        incr state(B) $B
        incr state(C) $C
        incr state(D) $D
        incr state(E) $E
    }

		return -code error "wrong # args: sha1::sha1 ?-bin|-hex? ?-channel channel|-file file|string?"
    return
}
	}

proc ::sha1::F1 {A B C D E W} {
    expr {(((($A << 5) & 0xffffffff) | (($A >> 27) & 0x1f)) \
               + ($D ^ ($B & ($C ^ $D))) + $E + $W + 0x5a827999) & 0xffffffff}
}

proc ::sha1::F2 {A B C D E W} {
    expr {(((($A << 5) & 0xffffffff) | (($A >> 27) & 0x1f)) \
               + ($B ^ $C ^ $D) + $E + $W + 0x6ed9eba1) & 0xffffffff}
}

proc ::sha1::F3 {A B C D E W} {
    expr {(((($A << 5) & 0xffffffff)| (($A >> 27) & 0x1f)) \
               + (($B & $C) | ($D & ($B | $C))) + $E + $W + 0x8f1bbcdc) & 0xffffffff}
}


	switch -- $mode {
proc ::sha1::F4 {A B C D E W} {
    expr {(((($A << 5) & 0xffffffff)| (($A >> 27) & 0x1f)) \
               + ($B ^ $C ^ $D) + $E + $W + 0xca62c1d6) & 0xffffffff}
}

		"-channel" {
proc ::sha1::rotl32 {v n} {
    return [expr {((($v << $n) \
                        | (($v >> (32 - $n)) \
                               & (0x7FFFFFFF >> (31 - $n))))) \
                      & 0xFFFFFFFF}]
}

			return -code error "Not implemented"

# -------------------------------------------------------------------------
# 
# In order to get this code to go as fast as possible while leaving
# the main code readable we can substitute the above function bodies
# into the transform procedure. This inlines the code for us an avoids
# a procedure call overhead within the loops.
#
# We can do some minor tweaking to improve speed on Tcl < 8.5 where we
# know our arithmetic is limited to 64 bits. On > 8.5 we may have 
# unconstrained integer arithmetic and must avoid letting it run away.
#

regsub -all -line \
    {\[F1 \$A \$B \$C \$D \$E (\[.*?\])\]} \
    $::sha1::SHA1Transform_body \
    {[expr {(rotl32($A,5) + ($D ^ ($B \& ($C ^ $D))) + $E + \1 + 0x5a827999) \& 0xffffffff}]} \
    ::sha1::SHA1Transform_body_tmp

regsub -all -line \
    {\[F2 \$A \$B \$C \$D \$E (\[.*?\])\]} \
    $::sha1::SHA1Transform_body_tmp \
    {[expr {(rotl32($A,5) + ($B ^ $C ^ $D) + $E + \1 + 0x6ed9eba1) \& 0xffffffff}]} \
    ::sha1::SHA1Transform_body_tmp

regsub -all -line \
    {\[F3 \$A \$B \$C \$D \$E (\[.*?\])\]} \
    $::sha1::SHA1Transform_body_tmp \
    {[expr {(rotl32($A,5) + (($B \& $C) | ($D \& ($B | $C))) + $E + \1 + 0x8f1bbcdc) \& 0xffffffff}]} \
    ::sha1::SHA1Transform_body_tmp

regsub -all -line \
    {\[F4 \$A \$B \$C \$D \$E (\[.*?\])\]} \
    $::sha1::SHA1Transform_body_tmp \
    {[expr {(rotl32($A,5) + ($B ^ $C ^ $D) + $E + \1 + 0xca62c1d6) \& 0xffffffff}]} \
    ::sha1::SHA1Transform_body_tmp

regsub -all -line \
    {rotl32\(\$A,5\)} \
    $::sha1::SHA1Transform_body_tmp \
    {((($A << 5) \& 0xffffffff) | (($A >> 27) \& 0x1f))} \
    ::sha1::SHA1Transform_body_tmp

regsub -all -line \
    {\[rotl32 \$B 30\]} \
    $::sha1::SHA1Transform_body_tmp \
    {[expr {int(($B << 30) | (($B >> 2) \& 0x3fffffff))}]} \
    ::sha1::SHA1Transform_body_tmp
#
# Version 2 avoids a few truncations to 32 bits in non-essential places.
#
regsub -all -line \
    {\[F1 \$A \$B \$C \$D \$E (\[.*?\])\]} \
    $::sha1::SHA1Transform_body \
    {[expr {rotl32($A,5) + ($D ^ ($B \& ($C ^ $D))) + $E + \1 + 0x5a827999}]} \
    ::sha1::SHA1Transform_body_tmp2

regsub -all -line \
    {\[F2 \$A \$B \$C \$D \$E (\[.*?\])\]} \
    $::sha1::SHA1Transform_body_tmp2 \
    {[expr {rotl32($A,5) + ($B ^ $C ^ $D) + $E + \1 + 0x6ed9eba1}]} \
    ::sha1::SHA1Transform_body_tmp2

		}
regsub -all -line \
    {\[F3 \$A \$B \$C \$D \$E (\[.*?\])\]} \
    $::sha1::SHA1Transform_body_tmp2 \
    {[expr {rotl32($A,5) + (($B \& $C) | ($D \& ($B | $C))) + $E + \1 + 0x8f1bbcdc}]} \
    ::sha1::SHA1Transform_body_tmp2

		"-file" {
regsub -all -line \
    {\[F4 \$A \$B \$C \$D \$E (\[.*?\])\]} \
    $::sha1::SHA1Transform_body_tmp2 \
    {[expr {rotl32($A,5) + ($B ^ $C ^ $D) + $E + \1 + 0xca62c1d6}]} \
    ::sha1::SHA1Transform_body_tmp2

			set output [_sha1_file [lindex $args end]]
regsub -all -line \
    {rotl32\(\$A,5\)} \
    $::sha1::SHA1Transform_body_tmp2 \
    {(($A << 5) | (($A >> 27) \& 0x1f))} \
    ::sha1::SHA1Transform_body_tmp2

		}
regsub -all -line \
    {\[rotl32 \$B 30\]} \
    $::sha1::SHA1Transform_body_tmp2 \
    {[expr {($B << 30) | (($B >> 2) \& 0x3fffffff)}]} \
    ::sha1::SHA1Transform_body_tmp2

		"-string" {
if {[package vsatisfies [package provide Tcl] 8.5]} {
    proc ::sha1::SHA1Transform {token msg} $::sha1::SHA1Transform_body_tmp
} else {
    proc ::sha1::SHA1Transform {token msg} $::sha1::SHA1Transform_body_tmp2
}

unset ::sha1::SHA1Transform_body
unset ::sha1::SHA1Transform_body_tmp
unset ::sha1::SHA1Transform_body_tmp2

# -------------------------------------------------------------------------

proc ::sha1::byte {n v} {expr {((0xFF << (8 * $n)) & $v) >> (8 * $n)}}
proc ::sha1::bytes {v} { 
    #format %c%c%c%c [byte 0 $v] [byte 1 $v] [byte 2 $v] [byte 3 $v]
    format %c%c%c%c \
        [expr {((0xFF000000 & $v) >> 24) & 0xFF}] \
        [expr {(0xFF0000 & $v) >> 16}] \
        [expr {(0xFF00 & $v) >> 8}] \
        [expr {0xFF & $v}]
}

# -------------------------------------------------------------------------

proc ::sha1::Hex {data} {
    binary scan $data H* result
    return $result
}

# -------------------------------------------------------------------------

# Description:
#  Pop the nth element off a list. Used in options processing.
#
proc ::sha1::Pop {varname {nth 0}} {
    upvar $varname args
    set r [lindex $args $nth]
			set output [_sha1_string [lindex $args end]]
    set args [lreplace $args $nth $nth]
    return $r
}

# -------------------------------------------------------------------------

# fileevent handler for chunked file hashing.
#
proc ::sha1::Chunk {token channel {chunksize 4096}} {
    upvar #0 $token state
    
    if {[eof $channel]} {
        fileevent $channel readable {}
        set state(reading) 0
    }
		}
        
    SHA1Update $token [read $channel $chunksize]
}

# -------------------------------------------------------------------------

proc ::sha1::sha1 {args} {
    array set opts {-hex 0 -filename {} -channel {} -chunksize 4096}
    if {[llength $args] == 1} {
        set opts(-hex) 1
    } else {
        while {[string match -* [set option [lindex $args 0]]]} {
            switch -glob -- $option {
                -hex       { set opts(-hex) 1 }
                -bin       { set opts(-hex) 0 }
                -file*     { set opts(-filename) [Pop args 1] }
                -channel   { set opts(-channel) [Pop args 1] }
                -chunksize { set opts(-chunksize) [Pop args 1] }
                default {
		default {
                    if {[llength $args] == 1} { break }
                    if {[string compare $option "--"] == 0} { Pop args; break }
                    set err [join [lsort [concat -bin [array names opts]]] ", "]
                    return -code error "bad option $option:\
                    must be one of $err"
                }
            }
            Pop args
        }
    }

    if {$opts(-filename) != {}} {
        set opts(-channel) [open $opts(-filename) r]
        fconfigure $opts(-channel) -translation binary
    }

    if {$opts(-channel) == {}} {

        if {[llength $args] != 1} {
            return -code error "wrong # args:\
			return -code error "invalid mode: $mode, must be one of -channel or -file (or a plain string)"
                should be \"sha1 ?-hex? -filename file | string\""
        }
		}
        set tok [SHA1Init]
        SHA1Update $tok [lindex $args 0]
        set r [SHA1Final $tok]

	}
    } else {

        set tok [SHA1Init]
        # FRINK: nocheck
        set [subst $tok](reading) 1
        fileevent $opts(-channel) readable \
            [list [namespace origin Chunk] \
                 $tok $opts(-channel) $opts(-chunksize)]
        # FRINK: nocheck
        vwait [subst $tok](reading)
        set r [SHA1Final $tok]

        # If we opened the channel - we should close it too.
        if {$opts(-filename) != {}} {
            close $opts(-channel)
        }
    }
    
    if {$opts(-hex)} {
        set r [Hex $r]
    }
    return $r
}

# -------------------------------------------------------------------------

proc ::sha1::hmac {args} {
    array set opts {-hex 1 -filename {} -channel {} -chunksize 4096}
    if {[llength $args] != 2} {
        while {[string match -* [set option [lindex $args 0]]]} {
            switch -glob -- $option {
                -key       { set opts(-key) [Pop args 1] }
                -hex       { set opts(-hex) 1 }
                -bin       { set opts(-hex) 0 }
                -file*     { set opts(-filename) [Pop args 1] }
                -channel   { set opts(-channel) [Pop args 1] }
                -chunksize { set opts(-chunksize) [Pop args 1] }
                default {
                    if {[llength $args] == 1} { break }
                    if {[string compare $option "--"] == 0} { Pop args; break }
                    set err [join [lsort [array names opts]] ", "]
                    return -code error "bad option $option:\
                    must be one of $err"
                }

            }
            Pop args
        }
    }

	if {$outputmode == "hex"} {
    if {[llength $args] == 2} {
        set opts(-key) [Pop args]
    }

		binary scan $output H* output
    if {![info exists opts(-key)]} {
        return -code error "wrong # args:\
            should be \"hmac ?-hex? -key key -filename file | string\""
    }
	}

    if {$opts(-filename) != {}} {
        set opts(-channel) [open $opts(-filename) r]
        fconfigure $opts(-channel) -translation binary
    }

    if {$opts(-channel) == {}} {

        if {[llength $args] != 1} {
            return -code error "wrong # args:\
                should be \"hmac ?-hex? -key key -filename file | string\""
        }
        set tok [HMACInit $opts(-key)]
        HMACUpdate $tok [lindex $args 0]
        set r [HMACFinal $tok]

    } else {

        set tok [HMACInit $opts(-key)]
        # FRINK: nocheck
        set [subst $tok](reading) 1
        fileevent $opts(-channel) readable \
            [list [namespace origin Chunk] \
                 $tok $opts(-channel) $opts(-chunksize)]
        # FRINK: nocheck
        vwait [subst $tok](reading)
        set r [HMACFinal $tok]

        # If we opened the channel - we should close it too.
        if {$opts(-filename) != {}} {
            close $opts(-channel)
        }
    }
    
    if {$opts(-hex)} {
        set r [Hex $r]
    }
    return $r
	return $output
}

# -------------------------------------------------------------------------

package provide sha1 $::sha1::version

# -------------------------------------------------------------------------
# Local Variables:
#   mode: tcl
#   indent-tabs-mode: nil
# End: