/*
 * Copyright (c) 2005 Rob Braun
 * All rights reserved.
 *
 * 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. Neither the name of Rob Braun nor the names of his contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
 */
/*
 * 03-Apr-2005
 * DRI: Rob Braun <bbraun@opendarwin.org>
 */
/*
 * Portions Copyright 2006, Apple Computer, Inc.
 * Christopher Ryan <ryanc@apple.com>
*/

#define _FILE_OFFSET_BITS 64

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <libgen.h>
#include <libxml/xmlwriter.h>
#include <libxml/xmlreader.h>
#include <libxml/xmlstring.h>

#include "config.h"
#ifndef HAVE_ASPRINTF
#include "asprintf.h"
#endif
#include "xar.h"
#include "filetree.h"
#include "archive.h"
#include "b64.h"
#include "ea.h"

/* Overview:
 * xar_file_t's exist within a xar_archive_t.  xar_prop_t's exist
 * within xar_file_t's and xar_attr_t's exist within xar_prop_t's
 * and xar_file_t's.
 * Basically, a xar_file_t is a container for xar_prop_t's.
 * xar_attr_t's are things like: <foo bar=5>blah</foo>
 * In this example, foo is the key of a xar_prop_t, and blah is
 * the value.  bar is the key of a xar_attr_t which is part of
 * foo's xar_prop_t, and 5 is bar's value.
 * xar_file_t's have xar_attr_t's for the case of:
 * <file id=42>
 * The file has an attribute of "id" with a value of "42".
 */

struct __xar_iter_t {
	const void *iter;
	char *path;
	void *node;
	int nochild;
};

/* Convenience macros for dereferencing the structs */
#define XAR_ITER(x) ((struct __xar_iter_t *)(x))

/* xar_attr_prop
 * Returns: a newly allocated and initialized property attribute.
 * It is the caller's responsibility to associate the attribute
 * with either a file or a property.
 */
xar_attr_t xar_attr_new(void) {
	xar_attr_t ret;

	ret = malloc(sizeof(struct __xar_attr_t));
	if(!ret) return NULL;

	XAR_ATTR(ret)->key = NULL;
	XAR_ATTR(ret)->value = NULL;
	XAR_ATTR(ret)->next = NULL;
	XAR_ATTR(ret)->ns = NULL;
	return ret;
}

int32_t xar_attr_pset(xar_file_t f, xar_prop_t p, const char *key, const char *value) {
	xar_attr_t a, i;
	if( !p ) {
		a = XAR_FILE(f)->attrs;
	} else {
		a = XAR_PROP(p)->attrs;
	}

	if( !a ) {
		a = xar_attr_new();
		if(!p)
			XAR_FILE(f)->attrs = a;
		else
			XAR_PROP(p)->attrs = a;
		XAR_ATTR(a)->key = strdup(key);
		XAR_ATTR(a)->value = strdup(value);
		return 0;
	}

	for(i = a; i && XAR_ATTR(i)->next; i = XAR_ATTR(i)->next) {
		if(strcmp(XAR_ATTR(i)->key, key)==0) {
			free((char*)XAR_ATTR(i)->value);
			XAR_ATTR(i)->value = strdup(value);
			return 0;
		}
	}
	a = xar_attr_new();
	if(!p) {
		XAR_ATTR(a)->next = XAR_ATTR(XAR_FILE(f)->attrs);
		XAR_FILE(f)->attrs = a;
	} else {
		XAR_ATTR(a)->next = XAR_ATTR(XAR_PROP(p)->attrs);
		XAR_PROP(p)->attrs = a;
	}
	XAR_ATTR(a)->key = strdup(key);
	XAR_ATTR(a)->value = strdup(value);
	return 0;
}

/* xar_attr_set
 * f: the file the attribute is associated with
 * prop: The property key the attribute is associated with.  This can
 *       be NULL to signify the attribute should be set for the file,
 *       rather than the property.
 * key: The name of the attribute to set.
 * value: The value of the attribute.
 * Returns: 0 on success, -1 on failure.
 * Summary: Basically, sets an attribute.  The only tricky part is
 * it can set an attribute on a property or a file.
 */
int32_t xar_attr_set(xar_file_t f, const char *prop, const char *key, const char *value) {
	if( !prop ) {
		return xar_attr_pset(f, NULL, key, value);
	} else {
		xar_prop_t p = NULL;
		p = xar_prop_find(XAR_FILE(f)->props, prop);
		if( !p ) return -1;
		return xar_attr_pset(f, p, key, value);
	}
}

const char *xar_attr_pget(xar_file_t f, xar_prop_t p, const char *key) {
	xar_attr_t a, i;

	if( !p )
		a = XAR_FILE(f)->attrs;
	else
		a = XAR_PROP(p)->attrs;

	if( !a ) return NULL;

	for(i = a; i && XAR_ATTR(i)->next; i = XAR_ATTR(i)->next) {
		if(strcmp(XAR_ATTR(i)->key, key)==0) {
			return XAR_ATTR(i)->value;
		}
	}
	if( i && (strcmp(XAR_ATTR(i)->key, key)==0))
		return XAR_ATTR(i)->value;
	return NULL;
}

/* xar_attr_get
 * f: file to find the associated attribute in
 * prop: name of the property the attribute is of.  May be NULL to specify
 *       the file's attributes.
 * key: name of the attribute to search for.
 * Returns: a reference to the value of the attribute.
 */
const char *xar_attr_get(xar_file_t f, const char *prop, const char *key) {
	if( !prop )
		return xar_attr_pget(f, NULL, key);
	else {
		xar_prop_t p = NULL;
		p = xar_prop_find(XAR_FILE(f)->props, prop);
		if( !p ) return NULL;
		return xar_attr_pget(f, p, key);
	}
}

/* xar_attr_free
 * a: attribute to free
 * Summary: frees the attribute structure and everything inside it.
 * It is the caller's responsibility to ensure the linked list gets
 * updated.  This will *not* do anything to ensure the consistency
 * of the attribute linked list.
 */
void xar_attr_free(xar_attr_t a) {
	if(!a) return;
	free((char*)XAR_ATTR(a)->key);
	free((char*)XAR_ATTR(a)->value);
	free(XAR_ATTR(a));
	return;
}

/* xar_attr_first
 * f: file to associate the iterator with
 * prop: the name of the property within the file to associate the iterator with
 * i: an iterator as returned by xar_iter_new
 * Returns: a pointer to the value of the first attribute associated with the
 * property 'prop' associated with the file 'f'
 * Summary: This MUST be called prior to calling xar_attr_next,
 * to iterate over the attributes of property key 'prop'.
 */
const char *xar_attr_first(xar_file_t f, const char *prop, xar_iter_t i) {
	xar_prop_t p = NULL;
	xar_attr_t a;

	if( !prop )
		a = XAR_FILE(f)->attrs;
	else {
		p = xar_prop_find(XAR_FILE(f)->props, prop);
		if( !p ) return NULL;
		a = XAR_PROP(p)->attrs;
	}

	if( !a ) return NULL;

	XAR_ITER(i)->iter = a;
	free(XAR_ITER(i)->node);
	XAR_ITER(i)->node = strdup(XAR_ATTR(a)->key);
	return XAR_ITER(i)->node;
}

/* xar_attr_next
 * i: iterator allocated by xar_iter_new, and initialized with xar_attr_first
 * Returns: a pointer to the key of the next attribute associated with
 * the iterator.  NULL will be returned when there are no more attributes
 * to find.
 */
const char *xar_attr_next(xar_iter_t i) {
	xar_attr_t a = XAR_ITER(i)->iter;

	if( XAR_ATTR(a)->next == NULL )
		return NULL;

	XAR_ITER(i)->iter = XAR_ATTR(a)->next;
	free(XAR_ITER(i)->node);
	XAR_ITER(i)->node = strdup(XAR_ATTR(XAR_ITER(i)->iter)->key);
	return XAR_ITER(i)->node;
}

/* xar_iter_new
 * Returns a newly allocated iterator for use on files, properties, or
 * attributes.
 */
xar_iter_t xar_iter_new() {
	xar_iter_t ret = malloc(sizeof(struct __xar_iter_t));
	if(!ret) return NULL;

	XAR_ITER(ret)->iter = NULL;
	XAR_ITER(ret)->path = NULL;
	XAR_ITER(ret)->node = NULL;
	XAR_ITER(ret)->nochild = 0;
	return ret;
}

/* xar_iter_free
 * Frees memory associated with the specified iterator
 */
void xar_iter_free(xar_iter_t i) {
	free(XAR_ITER(i)->node);
	free(XAR_ITER(i));
}

const char *xar_prop_getkey(xar_prop_t p) {
	return XAR_PROP(p)->key;
}
const char *xar_prop_getvalue(xar_prop_t p) {
	return XAR_PROP(p)->value;
}
int32_t xar_prop_setkey(xar_prop_t p, const char *key) {
	free((char *)XAR_PROP(p)->key);
	if(key)
		XAR_PROP(p)->key = strdup(key);
	return 0;
}
int32_t xar_prop_setvalue(xar_prop_t p, const char *value) {
	free((char *)XAR_PROP(p)->value);
	if(value)
		XAR_PROP(p)->value = strdup(value);
	return 0;
}

/* xar_prop_pfirst
 * f: file to retrieve the first property from
 * Returns: a xar_prop_t corresponding to the first xar_prop_t associated with f
 * NULL if there are no properties associated with the file.
 */
xar_prop_t xar_prop_pfirst(xar_file_t f) {
	return XAR_FILE(f)->props;
}

/* xar_prop_pnext
 * p: previous property used to retrieve the next
 * Returns: a xar_prop_t if there is a next, NULL otherwise
 */
xar_prop_t xar_prop_pnext(xar_prop_t p) {
	return XAR_PROP(p)->next;
}

/* xar_prop_first
 * f: file to associate the iterator with
 * i: an iterator as returned by xar_iter_new
 * Returns: a pointer to the value of the first property associated with
 * the file 'f'.
 * Summary: This MUST be called first prior to calling xar_prop_next,
 * to iterate over properties of file 'f'.  This has the side effect of
 * associating the iterator with the file's properties, which is needed
 * before xar_prop_next.
 */
const char *xar_prop_first(xar_file_t f, xar_iter_t i) {
	XAR_ITER(i)->iter = XAR_FILE(f)->props;
	free(XAR_ITER(i)->node);
	XAR_ITER(i)->node = strdup(XAR_PROP(XAR_ITER(i)->iter)->key);
	return XAR_ITER(i)->node;
}

/* xar_prop_next
 * i: iterator allocated by xar_iter_new, and initialized with xar_prop_first
 * Returns: a pointer to the value of the next property associated with
 * the iterator.  NULL will be returned when there are no more properties
 * to find.  If a property has a NULL value, the string "" will be returned.
 * This will recurse down child properties, flattening the namespace and
 * adding separators.  For instance a1->b1->c1, a1 will first be returned,
 * the subsequent call will return "a1/b1", and the next call will return
 * "a1/b1/c1", etc.
 */
const char *xar_prop_next(xar_iter_t i) {
	xar_prop_t p = XAR_ITER(i)->iter;
	if( !(XAR_ITER(i)->nochild) && XAR_PROP(p)->children ) {
		char *tmp = XAR_ITER(i)->path;
		if( tmp ) {
			asprintf(&XAR_ITER(i)->path, "%s/%s", tmp, XAR_PROP(p)->key);
			free(tmp);
		} else
			XAR_ITER(i)->path = strdup(XAR_PROP(p)->key);
		XAR_ITER(i)->iter = p = XAR_PROP(p)->children;
		goto SUCCESS;
	}
	XAR_ITER(i)->nochild = 0;

	if( XAR_PROP(p)->next ) {
		XAR_ITER(i)->iter = p = XAR_PROP(p)->next;
		goto SUCCESS;
	}

	if( XAR_PROP(p)->parent ) {
		char *tmp1, *tmp2;
		char *dname;

		if( strstr(XAR_ITER(i)->path, "/") ) {
		tmp1 = tmp2 = XAR_ITER(i)->path;
		dname = dirname(tmp2);
		XAR_ITER(i)->path = strdup(dname);
		free(tmp1);
		} else {
			free(XAR_ITER(i)->path);
			XAR_ITER(i)->path = NULL;
		}

		XAR_ITER(i)->iter = p = XAR_PROP(p)->parent;
		XAR_ITER(i)->nochild = 1;
		return xar_prop_next(i);
	}

	return NULL;
SUCCESS:
	free(XAR_ITER(i)->node);
	if( XAR_ITER(i)->path )
		asprintf((char **)&XAR_ITER(i)->node, "%s/%s", XAR_ITER(i)->path, XAR_PROP(p)->key);
	else {
		if(XAR_PROP(p)->key == NULL)
			XAR_ITER(i)->node = strdup("");
		else
			XAR_ITER(i)->node = strdup(XAR_PROP(p)->key);
	}
	return XAR_ITER(i)->node;
}

/* xar_prop_new
 * f: file to associate the new file with.  May not be NULL
 * parent: the parent property of the new property.  May be NULL
 * Returns: a newly allocated and initialized property.  
 * Summary: in addition to allocating the new property, it
 * will be inserted into the parent node's list of children,
 * and/or added to the file's list of properties, as appropriate.
 */
xar_prop_t xar_prop_new(xar_file_t f, xar_prop_t parent) {
	xar_prop_t p;

	p = malloc(sizeof(struct __xar_prop_t));
	if( !p ) return NULL;

	XAR_PROP(p)->key = NULL;
	XAR_PROP(p)->value = NULL;
	XAR_PROP(p)->children = NULL;
	XAR_PROP(p)->next = NULL;
	XAR_PROP(p)->attrs = NULL;
	XAR_PROP(p)->parent = parent;
	XAR_PROP(p)->file = f;
	XAR_PROP(p)->prefix = XAR_FILE(f)->prefix;
	XAR_PROP(p)->ns = NULL;
	if(parent) {
		if( !XAR_PROP(parent)->children ) {
			XAR_PROP(parent)->children = p;
		} else {
			XAR_PROP(p)->next = XAR_PROP(parent)->children;
			XAR_PROP(parent)->children = p;
		}
	} else {
		if( XAR_FILE(f)->props == NULL ) {
			XAR_FILE(f)->props = p;
		} else {
			XAR_PROP(p)->next = XAR_FILE(f)->props;
			XAR_FILE(f)->props = p;
		}
	}

	return p;
}

/* xar_prop_find
 * p: property to check
 * key: name of property to find.
 * Returns: reference to the property with the specified key
 * Summary: A node's name may be specified by a path, such as 
 * "a1/b1/c1", and child nodes will be searched for each 
 * "/" separator.  
 */
xar_prop_t xar_prop_find(xar_prop_t p, const char *key) {
	xar_prop_t i, ret;
	char *tmp1, *tmp2, *tmp3;

	if( !p ) return NULL;
	tmp2 = tmp1 = strdup(key);
	tmp3 = strsep(&tmp2, "/");
	i = p;
	do {
		if( strcmp(tmp3, XAR_PROP(i)->key) == 0 ) {
			if( tmp2 == NULL ) {
				free(tmp1);
				return i;
			}
			ret = xar_prop_find(XAR_PROP(i)->children, tmp2);
			free(tmp1);
			return ret;
		}
		i = XAR_PROP(i)->next;
	} while(i);
	free(tmp1);
	return NULL;
}

/* xar_prop_set_r
 * p: property to recurse down and set the property of
 * key: key of the property to set
 * value: desired value of the property
 * Returns: 0 on sucess, -1 on failure.
 * Summary: This is an internal helper function for xar_prop_set() which
 * does the recursion down the property tree.
 */
static xar_prop_t xar_prop_set_r(xar_file_t f, xar_prop_t p, const char *key, const char *value, int overwrite) {
	xar_prop_t i, ret, ret2, start;
	char *tmp1, *tmp2, *tmp3;

	tmp2 = tmp1 = strdup(key);
	tmp3 = strsep(&tmp2, "/");

	if( !p ) {
		start = XAR_FILE(f)->props;
	} else {
		start = XAR_PROP(p)->children;
	}
	
	for( i = start; i; i = XAR_PROP(i)->next ) {
		if( strcmp(tmp3, XAR_PROP(i)->key) == 0 ) {
			if( !tmp2 ) {
				if( overwrite ) {
					xar_prop_setvalue(i, value);
					free(tmp1);
					return i;
				} else {
					ret = xar_prop_new(f, p);
					if( !ret ) {
						free(tmp1);
						return ret;
					}
					xar_prop_setvalue(ret, value);
					xar_prop_setkey(ret, tmp3);
					free(tmp1);
					return ret;
				}
			}

			ret2 = xar_prop_set_r(f, i, tmp2, value, overwrite);
			free(tmp1);
			return ret2;
		}
	}

	ret = xar_prop_new(f, p);
	if( !ret ) {
		free(tmp1);
		return ret;
	}

	if( !tmp2 ) {
		xar_prop_setvalue(ret, value);
		xar_prop_setkey(ret, tmp3);
		free(tmp1);
		return ret;
	}

	xar_prop_setkey(ret, tmp3);
	xar_prop_setvalue(ret, NULL);

	ret2 = xar_prop_set_r(f, ret, tmp2, value, overwrite);
	free(tmp1);
	return ret2;
}

/* xar_prop_set
 * f: file to set the property on
 * key: key of the property to set
 * value: desired value of the property
 * Returns: 0 on success, -1 on failure
 * Summary: If the property already exists, its value is overwritten
 * by 'value'.  If the property does not exist, it is created.
 * Copies of key and value are kept in the tree.  The caller may do
 * what they wish with these values after the call returns.
 * References to these copies will be returned by iterating over
 * the properties, or by calling xar_prop_get().
 * These copies will be released when the property is released.
 *
 * Note that you *CANNOT* have a node with a value and children.
 * This implementation will let you, but the serialization to xml
 * will not be what you're hoping for.
 */
int32_t xar_prop_set(xar_file_t f, const char *key, const char *value) {
	if( xar_prop_set_r(f, NULL, key, value, 1) )
		return 0;
	return -1;
}

/* xar_prop_pset
 * Same as xar_prop_set, except it takes a xar_prop_t which will be
 * treated as the root property.
 * Returns a xar_prop_t that was created or set.  Returns NULL if error.
 */
xar_prop_t xar_prop_pset(xar_file_t f, xar_prop_t p, const char *key, const char *value) {
	return xar_prop_set_r(f, p, key, value, 1);
}

/* xar_prop_create
 * Identical to xar_prop_set, except it will not overwrite an existing
 * property, it will create another one.
 */
int32_t xar_prop_create(xar_file_t f, const char *key, const char *value) {
	if( xar_prop_set_r(f, NULL, key, value, 0) )
		return 0;
	return -1;
}

/* xar_prop_get
 * f: file to look for the property in
 * key: name of property to find.
 * value: on return, *value will point to the value of the property
 * value may be NULL, in which case, only the existence of the property
 * is tested.
 * Returns: 0 for success, -1 on failure
 * Summary: A node's name may be specified by a path, such as 
 * "a1/b1/c1", and child nodes will be searched for each 
 * "/" separator.  
 */
int32_t xar_prop_get(xar_file_t f, const char *key, const char **value) {
	xar_prop_t r = xar_prop_find(XAR_FILE(f)->props, key);
	if( !r ) {
		if(value)
			*value = NULL;
		return -1;
	}
	if(value)
		*value = XAR_PROP(r)->value;
	return 0;
}

xar_prop_t xar_prop_pget(xar_prop_t p, const char *key) {
	char *tmp;
	const char *k;
	xar_prop_t ret;
	k = XAR_PROP(p)->key;
	asprintf(&tmp, "%s/%s", k, key);
	ret = xar_prop_find(p, tmp);
	free(tmp);
	return ret;
}

/* xar_prop_replicate_r
* f: file to attach property
* p: property (list) to iterate and add
* parent: parent property
* Summary: Recursivley adds property list (p) to file (f) and parent (parent).
*/

void xar_prop_replicate_r(xar_file_t f, xar_prop_t p, xar_prop_t parent )
{
	xar_prop_t property = p;
	
	/* look through properties */
	for( property = p; property; property = property->next ){
		xar_prop_t	newprop = xar_prop_new( f, parent );
		
		/* copy the key value for the property */
		XAR_PROP(newprop)->key = strdup(property->key);
		if(property->value)
			XAR_PROP(newprop)->value = strdup(property->value);
		
		/* loop through the attributes and copy them */
		xar_attr_t a = NULL;
		xar_attr_t last = NULL;
		
		/* copy attributes for file */
		for(a = property->attrs; a; a = a->next) {			
			if( NULL == newprop->attrs ){
				last = xar_attr_new();
				XAR_PROP(newprop)->attrs = last;				
			}else{
				XAR_ATTR(last)->next = xar_attr_new();
				last = XAR_ATTR(last)->next;
			}
			
			XAR_ATTR(last)->key = strdup(a->key);
			if(a->value)
				XAR_ATTR(last)->value = strdup(a->value);
		}
		
		/* loop through the children properties and recursively add them */
		xar_prop_replicate_r(f, property->children, newprop );		
	}
	
}

/* xar_prop_free
 * p: property to free
 * Summary: frees the specified property and all its children.
 * Stored copies of the key and value will be released, as will
 * all attributes.
 */
void xar_prop_free(xar_prop_t p) {
	xar_prop_t i;
	xar_attr_t a;
	while( XAR_PROP(p)->children ) {
		i = XAR_PROP(p)->children;
		XAR_PROP(p)->children = XAR_PROP(i)->next;
		xar_prop_free(i);
	}
	while(XAR_PROP(p)->attrs) {
		a = XAR_PROP(p)->attrs;
		XAR_PROP(p)->attrs = XAR_ATTR(a)->next;
		xar_attr_free(a);
	}
	free((char*)XAR_PROP(p)->key);
	free((char*)XAR_PROP(p)->value);
	free(XAR_PROP(p));
}

void xar_prop_punset(xar_file_t f, xar_prop_t p) {
	xar_prop_t i;
	if( !p ) {
		return;
	}
	if( XAR_PROP(p)->parent ) {
		i = XAR_PROP(p)->parent->children;
		if( i == p ) {
			XAR_PROP(XAR_PROP(p)->parent)->children = XAR_PROP(p)->next;
			xar_prop_free(p);
			return;
		}
	} else {
		i = XAR_FILE(f)->props;
		if( i == p ) {
			XAR_FILE(f)->props = XAR_PROP(p)->next;
			xar_prop_free(p);
			return;
		}
	}

	while( i && (XAR_PROP(i)->next != XAR_PROP(p)) ) {
		i = XAR_PROP(i)->next;
	}
	if( i && (XAR_PROP(i)->next == XAR_PROP(p)) ) {
		XAR_PROP(i)->next = XAR_PROP(p)->next;
		xar_prop_free(p);
	}
	return;
}

void xar_prop_unset(xar_file_t f, const char *key) {
	xar_prop_t r = xar_prop_find(XAR_FILE(f)->props, key);

	xar_prop_punset(f, r);
	return;
}

/* xar_file_new
 * f: parent file of the file to be created.  May be NULL
 * Returns: a newly allocated file structure.
 */
xar_file_t xar_file_new(xar_file_t f) {
	xar_file_t ret, i;

	ret = calloc(1, sizeof(struct __xar_file_t));
	if(!ret) return NULL;

	XAR_FILE(ret)->parent = f;
	XAR_FILE(ret)->next = NULL;
	XAR_FILE(ret)->children = NULL;
	XAR_FILE(ret)->props = NULL;
	XAR_FILE(ret)->attrs = NULL;
	XAR_FILE(ret)->prefix = NULL;
	XAR_FILE(ret)->ns = NULL;
	XAR_FILE(ret)->fspath = NULL;
	XAR_FILE(ret)->eas = NULL;
	XAR_FILE(ret)->nexteaid = 0;
	if( f ) {
		if( !XAR_FILE(f)->children ) {
			XAR_FILE(f)->children = ret;
		} else {
			for(i = XAR_FILE(f)->children; XAR_FILE(i)->next; i = XAR_FILE(i)->next);
			XAR_FILE(i)->next = ret;
		}
	}

	return ret;
}

xar_file_t xar_file_replicate(xar_file_t original, xar_file_t newparent)
{
	xar_file_t ret = xar_file_new(newparent);	
	xar_attr_t a;
	
	/* copy attributes for file */
	for(a = XAR_FILE(original)->attrs; a; a = XAR_ATTR(a)->next) {
		/* skip the id attribute */
		if( 0 == strcmp(a->key, "id" ) )
			continue;
		
		xar_attr_set(ret, NULL , a->key, a->value );
	}
		
	/* recursively copy properties */
	xar_prop_replicate_r(ret, XAR_FILE(original)->props, NULL);

	return ret;
}

/* xar_file_free
 * f: file to free
 * Summary: frees the specified file and all children,
 * properties, and attributes associated with the file.
 */
void xar_file_free(xar_file_t f) {
	xar_file_t i;
	xar_prop_t n;
	xar_attr_t a;
	while(XAR_FILE(f)->children) {
		i = XAR_FILE(f)->children;
		XAR_FILE(f)->children = XAR_FILE(i)->next;
		xar_file_free(i);
	}
	while(XAR_FILE(f)->props) {
		n = XAR_FILE(f)->props;
		XAR_FILE(f)->props = XAR_PROP(n)->next;
		xar_prop_free(n);
	}
	while(XAR_FILE(f)->attrs) {
		a = XAR_FILE(f)->attrs;
		XAR_FILE(f)->attrs = XAR_ATTR(a)->next;
		xar_attr_free(a);
	}
	free((char *)XAR_FILE(f)->fspath);
	free(XAR_FILE(f));
}

/* xar_file_first
 * x: archive to associate the iterator with
 * i: an iterator as returned by xar_iter_new
 * Returns: a pointer to the name of the first file associated with
 * the archive 'x'.
 * Summary: This MUST be called first prior to calling xar_file_next,
 * to iterate over files of archive 'x'.  This has the side effect of
 * associating the iterator with the archive's files, which is needed
 * before xar_file_next.
 */
xar_file_t xar_file_first(xar_t x, xar_iter_t i) {
	XAR_ITER(i)->iter = XAR(x)->files;
	free(XAR_ITER(i)->node);
	return XAR_ITER(i)->iter;
}

/* xar_file_next
 * i: iterator allocated by xar_iter_new, and initialized with xar_file_first
 * Returns: a pointer to the name of the next file associated with
 * the iterator.  NULL will be returned when there are no more files
 * to find.  
 * This will recurse down child files (directories), flattening the 
 * namespace and adding separators.  For instance a1->b1->c1, a1 will 
 * first be returned, the subsequent call will return "a1/b1", and the 
 * next call will return "a1/b1/c1", etc.
 */
xar_file_t xar_file_next(xar_iter_t i) {
	xar_file_t f = XAR_ITER(i)->iter;
	const char *name;
	if( !(XAR_ITER(i)->nochild) && XAR_FILE(f)->children ) {
		char *tmp = XAR_ITER(i)->path;
		xar_prop_get(f, "name", &name);
		if( tmp ) {
			asprintf(&XAR_ITER(i)->path, "%s/%s", tmp, name);
			free(tmp);
		} else
			XAR_ITER(i)->path = strdup(name);
		XAR_ITER(i)->iter = f = XAR_FILE(f)->children;
		goto FSUCCESS;
	}
	XAR_ITER(i)->nochild = 0;

	if( XAR_FILE(f)->next ) {
		XAR_ITER(i)->iter = f = XAR_FILE(f)->next;
		goto FSUCCESS;
	}

	if( XAR_FILE(f)->parent ) {
		char *tmp1, *tmp2;
		char *dname;

		if( strstr(XAR_ITER(i)->path, "/") ) {
			tmp1 = tmp2 = XAR_ITER(i)->path;
			dname = dirname(tmp2);
			XAR_ITER(i)->path = strdup(dname);
			free(tmp1);
		} else {
			free(XAR_ITER(i)->path);
			XAR_ITER(i)->path = NULL;
		}

		XAR_ITER(i)->iter = f = XAR_FILE(f)->parent;
		XAR_ITER(i)->nochild = 1;
		return xar_file_next(i);
	}

	return NULL;
FSUCCESS:
	xar_prop_get(f, "name", &name);
	XAR_ITER(i)->iter = (void *)f;

	return XAR_ITER(i)->iter;
}

/* xar_file_find
 * f: file subtree to look under
 * path: path to file to find
 * Returns the file_t describing the file, or NULL if not found.
 */
xar_file_t xar_file_find(xar_file_t f, const char *path) {
	xar_file_t i, ret;
	char *tmp1, *tmp2, *tmp3;

	if( !f ) return NULL;
	tmp2 = tmp1 = strdup(path);
	tmp3 = strsep(&tmp2, "/");
	i = f;
	do {
		const char *name;
		xar_prop_get(i, "name", &name);
		if( name == NULL ) continue;
		if( strcmp(tmp3, name) == 0 ) {
			if( tmp2 == NULL ) {
				free(tmp1);
				return i;
			}
			ret = xar_file_find(XAR_FILE(i)->children, tmp2);
			free(tmp1);
			return ret;
		}
		i = XAR_FILE(i)->next;
	} while(i);
	free(tmp1);
	return NULL;
}


/* xar_prop_serialize
 * p: property to serialize
 * writer: the xmlTextWriterPtr allocated by xmlNewTextWriter*()
 * Summary: recursively serializes the property passed to it, including
 * children, siblings, attributes, etc.
 */
void xar_prop_serialize(xar_prop_t p, xmlTextWriterPtr writer) {
	xar_prop_t i;
	xar_attr_t a;

	if( !p )
		return;
	i = p;
	do {
		if( XAR_PROP(i)->prefix || XAR_PROP(i)->ns )
			xmlTextWriterStartElementNS(writer, BAD_CAST(XAR_PROP(i)->prefix), BAD_CAST(XAR_PROP(i)->key), NULL);
		else
			xmlTextWriterStartElement(writer, BAD_CAST(XAR_PROP(i)->key));
		for(a = XAR_PROP(i)->attrs; a; a = XAR_ATTR(a)->next) {
			xmlTextWriterWriteAttributeNS(writer, BAD_CAST(XAR_ATTR(a)->ns), BAD_CAST(XAR_ATTR(a)->key), NULL, BAD_CAST(XAR_ATTR(a)->value));
		}
		if( XAR_PROP(i)->value ) {
			if( strcmp(XAR_PROP(i)->key, "name") == 0 ) {
				unsigned char *tmp;
				int outlen = strlen(XAR_PROP(i)->value);
				int inlen, len;

				inlen = len = outlen;

				tmp = malloc(len);
				assert(tmp);
				if( UTF8Toisolat1(tmp, &len, BAD_CAST(XAR_PROP(i)->value), &inlen) < 0 ) {
					xmlTextWriterWriteAttribute(writer, BAD_CAST("enctype"), BAD_CAST("base64"));
					xmlTextWriterWriteBase64(writer, XAR_PROP(i)->value, 0, strlen(XAR_PROP(i)->value));
				} else
					xmlTextWriterWriteString(writer, BAD_CAST(XAR_PROP(i)->value));
				free(tmp);
			} else
				xmlTextWriterWriteString(writer, BAD_CAST(XAR_PROP(i)->value));
		}

		if( XAR_PROP(i)->children ) {
			xar_prop_serialize(XAR_PROP(i)->children, writer);
		}
		xmlTextWriterEndElement(writer);

		i = XAR_PROP(i)->next;
	} while(i);
}

/* xar_file_serialize
 * f: file to serialize
 * writer: the xmlTextWriterPtr allocated by xmlNewTextWriter*()
 * Summary: recursively serializes the file passed to it, including
 * children, siblings, properties, attributes, etc.
 */
void xar_file_serialize(xar_file_t f, xmlTextWriterPtr writer) {
	xar_file_t i;
	xar_attr_t a;

	i = f;
	do {
		xmlTextWriterStartElement(writer, BAD_CAST("file"));
		for(a = XAR_FILE(i)->attrs; a; a = XAR_ATTR(a)->next) {
			xmlTextWriterWriteAttribute(writer, BAD_CAST(XAR_ATTR(a)->key), BAD_CAST(XAR_ATTR(a)->value));
		}
		xar_prop_serialize(XAR_FILE(i)->props, writer);
		if( XAR_FILE(i)->children )
			xar_file_serialize(XAR_FILE(i)->children, writer);
		xmlTextWriterEndElement(writer);
		i = XAR_FILE(i)->next;
	} while(i);
	return;
}

/* xar_prop_unserialize
 * f: file the property is to belong to
 * p: parent property, may be NULL
 * reader: xmlTextReaderPtr already allocated
 */
int32_t xar_prop_unserialize(xar_file_t f, xar_prop_t parent, xmlTextReaderPtr reader) {
	const char *name, *value, *ns;
	int type, i, isempty = 0;
	int isname = 0, isencoded = 0;
	xar_prop_t p;

	p = xar_prop_new(f, parent);
	if( xmlTextReaderIsEmptyElement(reader) )
		isempty = 1;
	i = xmlTextReaderAttributeCount(reader);
	name = (const char *)xmlTextReaderConstLocalName(reader);
	XAR_PROP(p)->key = strdup(name);
	ns = (const char *)xmlTextReaderConstPrefix(reader);
	if( ns ) XAR_PROP(p)->prefix = strdup(ns);
	if( strcmp(name, "name") == 0 )
		isname = 1;
	if( i > 0 ) {
		for(i = xmlTextReaderMoveToFirstAttribute(reader); i == 1; i = xmlTextReaderMoveToNextAttribute(reader)) {
			xar_attr_t a;
			const char *name = (const char *)xmlTextReaderConstLocalName(reader);
			const char *value = (const char *)xmlTextReaderConstValue(reader);
			const char *ns = (const char *)xmlTextReaderConstPrefix(reader);
			if( isname && (strcmp(name, "enctype") == 0) && (strcmp(value, "base64") == 0) ) {
				isencoded = 1;
			} else {
				a = xar_attr_new();
				XAR_ATTR(a)->key = strdup(name);
				XAR_ATTR(a)->value = strdup(value);
				if(ns) XAR_ATTR(a)->ns = strdup(ns);
				XAR_ATTR(a)->next = XAR_PROP(p)->attrs;
				XAR_PROP(p)->attrs = a;
			}
		}
	}
	if( isempty )
		return 0;
	while( xmlTextReaderRead(reader) == 1) {
		type = xmlTextReaderNodeType(reader);
		switch(type) {
		case XML_READER_TYPE_ELEMENT:
			xar_prop_unserialize(f, p, reader);
			break;
		case XML_READER_TYPE_TEXT:
			value = (const char *)xmlTextReaderConstValue(reader);
			free((char*)XAR_PROP(p)->value);
			if( isencoded )
				XAR_PROP(p)->value = (const char *)xar_from_base64(BAD_CAST(value), strlen(value));
			else
				XAR_PROP(p)->value = strdup(value);
			if( isname ) {
				if( XAR_FILE(f)->parent ) {
					asprintf((char **)&XAR_FILE(f)->fspath, "%s/%s", XAR_FILE(XAR_FILE(f)->parent)->fspath, XAR_PROP(p)->value);
				} else {
					XAR_FILE(f)->fspath = strdup(XAR_PROP(p)->value);
				}
			}
			break;
		case XML_READER_TYPE_END_ELEMENT:
			return 0;
			break;
		}
	}

	/* XXX: Should never be reached */
	return 0;
}

/* xar_file_unserialize
 * x: archive we're unserializing to
 * parent: The parent file of the file to be unserialized.  May be NULL
 * reader: The xmlTextReaderPtr we are reading the xml from.
 * Summary: Takes a <file> node, and adds all attributes, child properties,
 * and child files.
 */
xar_file_t xar_file_unserialize(xar_t x, xar_file_t parent, xmlTextReaderPtr reader) {
	xar_file_t ret;
	const char *name;
	int type, i;

	ret = xar_file_new(parent);

	i = xmlTextReaderAttributeCount(reader);
	if( i > 0 ) {
		for(i = xmlTextReaderMoveToFirstAttribute(reader); i == 1; i = xmlTextReaderMoveToNextAttribute(reader)) {
			xar_attr_t a;
			const char *name = (const char *)xmlTextReaderConstLocalName(reader);
			const char *value = (const char *)xmlTextReaderConstValue(reader);
			a = xar_attr_new();
			XAR_ATTR(a)->key = strdup(name);
			XAR_ATTR(a)->value = strdup(value);
			XAR_ATTR(a)->next = XAR_FILE(ret)->attrs;
			XAR_FILE(ret)->attrs = a;
		}
	}

	while( xmlTextReaderRead(reader) == 1 ) {
		type = xmlTextReaderNodeType(reader);
		name = (const char *)xmlTextReaderConstLocalName(reader);
		if( (type == XML_READER_TYPE_END_ELEMENT) && (strcmp(name, "file")==0) ) {
			const char *opt;
			xar_prop_get(ret, "type", &opt);
			if( opt && (strcmp(opt, "hardlink") == 0) ) {
				opt = xar_attr_get(ret, "type", "link");
				if( opt && (strcmp(opt, "original") == 0) ) {
					opt = xar_attr_get(ret, NULL, "id");
					xmlHashAddEntry(XAR(x)->link_hash, BAD_CAST(opt), XAR_FILE(ret));
				}
			}
			return ret;
		}

		if( type == XML_READER_TYPE_ELEMENT ) {
			if( strcmp(name, "file")==0 ) {
				xar_file_unserialize(x, ret, reader);
			} else
				xar_prop_unserialize(ret, NULL, reader);
		}
	}

	/* XXX Should never be reached */
	return ret;
}