/*
 * assembly.c: Routines for loading assemblies.
 * 
 * Author:
 *   Miguel de Icaza (miguel@ximian.com)
 *
 * (C) 2001 Ximian, Inc.  http://www.ximian.com
 *
 */
#include <config.h>
#include <stdio.h>
#include <glib.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "assembly.h"
#include "image.h"
#include "cil-coff.h"
#include "rawbuffer.h"
#include <mono/metadata/loader.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/metadata-internals.h>
#include <mono/metadata/class-internals.h>
#include <mono/metadata/domain-internals.h>
#include <mono/metadata/mono-endian.h>
#include <mono/io-layer/io-layer.h>
#include <mono/utils/mono-uri.h>
#include <mono/metadata/mono-config.h>
#include <mono/utils/mono-digest.h>
#include <mono/utils/mono-logger.h>
#include <mono/metadata/reflection.h>

#ifndef PLATFORM_WIN32
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#endif

/* AssemblyVersionMap: an assembly name and the assembly version set on which it is based */
typedef struct  {
	const char* assembly_name;
	guint8 version_set_index;
} AssemblyVersionMap;

/* the default search path is empty, the first slot is replaced with the computed value */
static const char*
default_path [] = {
	NULL,
	NULL
};

/* Contains the list of directories to be searched for assemblies (MONO_PATH) */
static char **assemblies_path = NULL;

/* Contains the list of directories that point to auxiliary GACs */
static char **extra_gac_paths = NULL;

/* The list of system assemblies what will be remapped to the running
 * runtime version. WARNING: this list must be sorted.
 */
static const AssemblyVersionMap framework_assemblies [] = {
	{"Accessibility", 0},
	{"Commons.Xml.Relaxng", 0},
	{"I18N", 0},
	{"I18N.CJK", 0},
	{"I18N.MidEast", 0},
	{"I18N.Other", 0},
	{"I18N.Rare", 0},
	{"I18N.West", 0},
	{"Microsoft.VisualBasic", 1},
	{"Microsoft.VisualC", 1},
	{"Mono.Cairo", 0},
	{"Mono.CompilerServices.SymbolWriter", 0},
	{"Mono.Data", 0},
	{"Mono.Data.SqliteClient", 0},
	{"Mono.Data.SybaseClient", 0},
	{"Mono.Data.Tds", 0},
	{"Mono.Data.TdsClient", 0},
	{"Mono.GetOptions", 0},
	{"Mono.Http", 0},
	{"Mono.Posix", 0},
	{"Mono.Security", 0},
	{"Mono.Security.Win32", 0},
	{"Mono.Xml.Ext", 0},
	{"Novell.Directory.Ldap", 0},
	{"Npgsql", 0},
	{"PEAPI", 0},
	{"System", 0},
	{"System.Configuration.Install", 0},
	{"System.Data", 0},
	{"System.Data.OracleClient", 0},
	{"System.Data.SqlXml", 0},
	{"System.Design", 0},
	{"System.DirectoryServices", 0},
	{"System.Drawing", 0},
	{"System.Drawing.Design", 0},
	{"System.EnterpriseServices", 0},
	{"System.Management", 0},
	{"System.Messaging", 0},
	{"System.Runtime.Remoting", 0},
	{"System.Runtime.Serialization.Formatters.Soap", 0},
	{"System.Security", 0},
	{"System.ServiceProcess", 0},
	{"System.Web", 0},
	{"System.Web.Mobile", 0},
	{"System.Web.Services", 0},
	{"System.Windows.Forms", 0},
	{"System.Xml", 0},
	{"mscorlib", 0}
};

/*
 * keeps track of loaded assemblies
 */
static GList *loaded_assemblies = NULL;
static MonoAssembly *corlib;

/* This protects loaded_assemblies and image->references */
#define mono_assemblies_lock() EnterCriticalSection (&assemblies_mutex)
#define mono_assemblies_unlock() LeaveCriticalSection (&assemblies_mutex)
static CRITICAL_SECTION assemblies_mutex;

/* A hastable of thread->assembly list mappings */
static GHashTable *assemblies_loading;

/* A hashtable of reflection only load thread->assemblies mappings */
static GHashTable *assemblies_refonly_loading;

/* If defined, points to the bundled assembly information */
const MonoBundledAssembly **bundles;

/* Loaded assembly binding info */
static GSList *loaded_assembly_bindings = NULL;

static MonoAssembly*
mono_assembly_invoke_search_hook_internal (MonoAssemblyName *aname, gboolean refonly, gboolean postload);

static gchar*
encode_public_tok (const guchar *token, gint32 len)
{
	const static gchar allowed [] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
	gchar *res;
	int i;

	res = g_malloc (len * 2 + 1);
	for (i = 0; i < len; i++) {
		res [i * 2] = allowed [token [i] >> 4];
		res [i * 2 + 1] = allowed [token [i] & 0xF];
	}
	res [len * 2] = 0;
	return res;
}

static void
check_path_env (void)
{
	const char *path;
	char **splitted;
	
	path = g_getenv ("MONO_PATH");
	if (!path)
		return;

	splitted = g_strsplit (path, G_SEARCHPATH_SEPARATOR_S, 1000);
	if (assemblies_path)
		g_strfreev (assemblies_path);
	assemblies_path = splitted;
	if (g_getenv ("MONO_DEBUG") == NULL)
		return;

	while (*splitted) {
		if (**splitted && !g_file_test (*splitted, G_FILE_TEST_IS_DIR))
			g_warning ("'%s' in MONO_PATH doesn't exist or has wrong permissions.", *splitted);

		splitted++;
	}
}

static void
check_extra_gac_path_env (void) {
	const char *path;
	char **splitted;
	
	path = g_getenv ("MONO_GAC_PREFIX");
	if (!path)
		return;

	splitted = g_strsplit (path, G_SEARCHPATH_SEPARATOR_S, 1000);
	if (extra_gac_paths)
		g_strfreev (extra_gac_paths);
	extra_gac_paths = splitted;
	if (g_getenv ("MONO_DEBUG") == NULL)
		return;

	while (*splitted) {
		if (**splitted && !g_file_test (*splitted, G_FILE_TEST_IS_DIR))
			g_warning ("'%s' in MONO_GAC_PATH doesn't exist or has wrong permissions.", *splitted);

		splitted++;
	}
}

static gboolean
assembly_binding_maps_name (MonoAssemblyBindingInfo *info, MonoAssemblyName *aname)
{
	if (strcmp (info->name, aname->name))
		return FALSE;

	if (info->major != aname->major || info->minor != aname->minor)
		return FALSE;

	if ((info->culture != NULL) != (aname->culture != NULL))
		return FALSE;
	
	if (info->culture && strcmp (info->culture, aname->culture))
		return FALSE;
	
	if (strcmp ((const char *)info->public_key_token, (const char *)aname->public_key_token))
		return FALSE;

	return TRUE;
}

static void
mono_assembly_binding_info_free (MonoAssemblyBindingInfo *info)
{
	g_free (info->name);
	g_free (info->culture);
}

static void
get_publisher_policy_info (MonoImage *image, MonoAssemblyName *aname, MonoAssemblyBindingInfo *binding_info)
{
	MonoTableInfo *t;
	guint32 cols [MONO_MANIFEST_SIZE];
	const gchar *filename;
	gchar *subpath, *fullpath;

	t = &image->tables [MONO_TABLE_MANIFESTRESOURCE];
	/* MS Impl. accepts policy assemblies with more than
	 * one manifest resource, and only takes the first one */
	if (t->rows < 1) {
		binding_info->is_valid = FALSE;
		return;
	}
	
	mono_metadata_decode_row (t, 0, cols, MONO_MANIFEST_SIZE);
	if ((cols [MONO_MANIFEST_IMPLEMENTATION] & MONO_IMPLEMENTATION_MASK) != MONO_IMPLEMENTATION_FILE) {
		binding_info->is_valid = FALSE;
		return;
	}
	
	filename = mono_metadata_string_heap (image, cols [MONO_MANIFEST_NAME]);
	g_assert (filename != NULL);
	
	subpath = g_path_get_dirname (image->name);
	fullpath = g_build_path (G_DIR_SEPARATOR_S, subpath, filename, NULL);
	mono_config_parse_publisher_policy (fullpath, binding_info);
	g_free (subpath);
	g_free (fullpath);
	
	/* Define the optional elements/attributes before checking */
	if (!binding_info->culture)
		binding_info->culture = g_strdup ("");
	
	/* Check that the most important elements/attributes exist */
	if (!binding_info->name || !binding_info->public_key_token [0] || !binding_info->has_old_version_bottom ||
			!binding_info->has_new_version || !assembly_binding_maps_name (binding_info, aname)) {
		mono_assembly_binding_info_free (binding_info);
		binding_info->is_valid = FALSE;
		return;
	}

	binding_info->is_valid = TRUE;
}

static int
compare_versions (AssemblyVersionSet *v, MonoAssemblyName *aname)
{
	if (v->major > aname->major)
		return 1;
	else if (v->major < aname->major)
		return -1;

	if (v->minor > aname->minor)
		return 1;
	else if (v->minor < aname->minor)
		return -1;

	if (v->build > aname->build)
		return 1;
	else if (v->build < aname->build)
		return -1;

	if (v->revision > aname->revision)
		return 1;
	else if (v->revision < aname->revision)
		return -1;

	return 0;
}

static gboolean
check_policy_versions (MonoAssemblyBindingInfo *info, MonoAssemblyName *name)
{
	if (!info->is_valid)
		return FALSE;
	
	/* If has_old_version_top doesn't exist, we don't have an interval */
	if (!info->has_old_version_top) {
		if (compare_versions (&info->old_version_bottom, name) == 0)
			return TRUE;

		return FALSE;
	}

	/* Check that the version defined by name is valid for the interval */
	if (compare_versions (&info->old_version_top, name) < 0)
		return FALSE;

	/* We should be greater or equal than the small version */
	if (compare_versions (&info->old_version_bottom, name) > 0)
		return FALSE;

	return TRUE;
}

/**
 * mono_assembly_names_equal:
 * @l: first assembly
 * @r: second assembly.
 *
 * Compares two MonoAssemblyNames and returns whether they are equal.
 * This compares the names, the cultures, the release version and their
 * public tokens.
 *
 * Returns: TRUE if both assembly names are equal.
 */
gboolean
mono_assembly_names_equal (MonoAssemblyName *l, MonoAssemblyName *r)
{
	if (!l->name || !r->name)
		return FALSE;

	if (strcmp (l->name, r->name))
		return FALSE;

	if (l->culture && r->culture && strcmp (l->culture, r->culture))
		return FALSE;

	if (l->major != r->major || l->minor != r->minor ||
			l->build != r->build || l->revision != r->revision)
		if (! ((l->major == 0 && l->minor == 0 && l->build == 0 && l->revision == 0) || (r->major == 0 && r->minor == 0 && r->build == 0 && r->revision == 0)))
			return FALSE;

	if (!l->public_key_token [0] || !r->public_key_token [0])
		return TRUE;

	if (strcmp ((char*)l->public_key_token, (char*)r->public_key_token))
		return FALSE;

	return TRUE;
}

static MonoAssembly*
search_loaded (MonoAssemblyName* aname, gboolean refonly)
{
	GList *tmp;
	MonoAssembly *ass;
	GList *loading;

	ass = mono_assembly_invoke_search_hook_internal (aname, refonly, FALSE);
	if (ass)
		return ass;
	
	/*
	 * The assembly might be under load by this thread. In this case, it is
	 * safe to return an incomplete instance to prevent loops.
	 */
	loading = g_hash_table_lookup (refonly ? assemblies_refonly_loading : assemblies_loading, (gpointer)GetCurrentThreadId ());
	for (tmp = loading; tmp; tmp = tmp->next) {
		ass = tmp->data;
		if (!mono_assembly_names_equal (aname, &ass->aname))
			continue;

		return ass;
	}

	return NULL;
}

static MonoAssembly *
load_in_path (const char *basename, const char** search_path, MonoImageOpenStatus *status, MonoBoolean refonly)
{
	int i;
	char *fullpath;
	MonoAssembly *result;

	for (i = 0; search_path [i]; ++i) {
		fullpath = g_build_filename (search_path [i], basename, NULL);
		result = mono_assembly_open_full (fullpath, status, refonly);
		g_free (fullpath);
		if (result)
			return result;
	}
	return NULL;
}

/**
 * mono_assembly_setrootdir:
 * @root_dir: The pathname of the root directory where we will locate assemblies
 *
 * This routine sets the internal default root directory for looking up
 * assemblies.  This is used by Windows installations to compute dynamically
 * the place where the Mono assemblies are located.
 *
 */
void
mono_assembly_setrootdir (const char *root_dir)
{
	/*
	 * Override the MONO_ASSEMBLIES directory configured at compile time.
	 */
	/* Leak if called more than once */
	default_path [0] = g_strdup (root_dir);
}

/**
 * mono_assembly_getrootdir:
 *
 * Returns: The internal root directory used for looking up assemblies
 */
G_CONST_RETURN gchar *
mono_assembly_getrootdir (void)
{
	return default_path [0];
}

/**
 * mono_set_dirs:
 * @assembly_dir: the base directory for assemblies
 * @config_dir: the base directory for configuration files
 *
 * This routine is used internally and by developers embedding
 * the runtime into their own applications.  There are a number
 * of cases to consider: Mono as a system-installed package that
 * is available on the location preconfigured or Mono in a relocated
 * location.
 *
 * If you are using a system-installed Mono, you can pass NULL
 * to both parameters.  If you are not, you should compute both
 * directory values and call this routine.
 *
 * The values for a given PREFIX are:
 *
 *    assembly_dir: PREFIX/lib
 *    config_dir:   PREFIX/etc
 *
 * Notice that embedders that use Mono in a relocated way must
 * compute the location at runtime, as they will be in control
 * of where Mono is installed.
 */
void
mono_set_dirs (const char *assembly_dir, const char *config_dir)
{
#if defined (MONO_ASSEMBLIES)
	if (assembly_dir == NULL)
		assembly_dir = MONO_ASSEMBLIES;
#endif
#if defined (MONO_CFG_DIR)
	if (config_dir == NULL)
		config_dir = MONO_CFG_DIR;
#endif
	mono_assembly_setrootdir (assembly_dir);
	mono_set_config_dir (config_dir);
}

#ifndef PLATFORM_WIN32

static char *
compute_base (char *path)
{
	char *p = rindex (path, '/');
	if (p == NULL)
		return NULL;

	/* Not a well known Mono executable, we are embedded, cant guess the base  */
	if (strcmp (p, "/mono") && strcmp (p, "/monodis") && strcmp (p, "/mint") && strcmp (p, "/monodiet"))
		return NULL;
	    
	*p = 0;
	p = rindex (path, '/');
	if (p == NULL)
		return NULL;
	
	if (strcmp (p, "/bin") != 0)
		return NULL;
	*p = 0;
	return path;
}

static void
fallback (void)
{
	mono_set_dirs (MONO_ASSEMBLIES, MONO_CFG_DIR);
}

static void
set_dirs (char *exe)
{
	char *base;
	char *config, *lib, *mono;
	struct stat buf;
	
	/*
	 * Only /usr prefix is treated specially
	 */
	if (strncmp (exe, MONO_BINDIR, strlen (MONO_BINDIR)) == 0 || (base = compute_base (exe)) == NULL){
		fallback ();
		return;
	}

	config = g_build_filename (base, "etc", NULL);
	lib = g_build_filename (base, "lib", NULL);
	mono = g_build_filename (lib, "mono/1.0", NULL);
	if (stat (mono, &buf) == -1)
		fallback ();
	else {
		mono_set_dirs (lib, config);
	}
	
	g_free (config);
	g_free (lib);
	g_free (mono);
}

#endif /* PLATFORM_WIN32 */

#ifdef UNDER_CE
#undef GetModuleFileName
#define GetModuleFileName ceGetModuleFileNameA

DWORD ceGetModuleFileNameA(HMODULE hModule, char* lpFilename, DWORD nSize)
{
	DWORD res = 0;
	wchar_t* wbuff = (wchar_t*)LocalAlloc(LPTR, nSize*2);
	res = GetModuleFileNameW(hModule, wbuff, nSize);
	if (res) {
		int len = wcslen(wbuff);
		WideCharToMultiByte(CP_ACP, 0, wbuff, len, lpFilename, len, NULL, NULL);
	}
	LocalFree(wbuff);
	return res;
}
#endif

/**
 * mono_set_rootdir:
 *
 * Registers the root directory for the Mono runtime, for Linux and Solaris 10,
 * this auto-detects the prefix where Mono was installed. 
 */
void
mono_set_rootdir (void)
{
#ifdef PLATFORM_WIN32
	gunichar2 moddir [MAXPATHLEN];
	gchar *bindir, *installdir, *root, *utf8name, *config;

	GetModuleFileNameW (NULL, moddir, MAXPATHLEN);
	utf8name = g_utf16_to_utf8 (moddir, -1, NULL, NULL, NULL);
	bindir = g_path_get_dirname (utf8name);
	installdir = g_path_get_dirname (bindir);
	root = g_build_path (G_DIR_SEPARATOR_S, installdir, "lib", NULL);

	config = g_build_filename (root, "..", "etc", NULL);
	mono_set_dirs (root, config);

	g_free (config);
	g_free (root);
	g_free (installdir);
	g_free (bindir);
	g_free (utf8name);
#else
	char buf [4096];
	int  s;
	char *str;

	/* Linux style */
	s = readlink ("/proc/self/exe", buf, sizeof (buf)-1);

	if (s != -1){
		buf [s] = 0;
		set_dirs (buf);
		return;
	}

	/* Solaris 10 style */
	str = g_strdup_printf ("/proc/%d/path/a.out", getpid ());
	s = readlink (str, buf, sizeof (buf)-1);
	g_free (str);
	if (s != -1){
		buf [s] = 0;
		set_dirs (buf);
		return;
	} 
	fallback ();
#endif
}

/**
 * mono_assemblies_init:
 *
 *  Initialize global variables used by this module.
 */
void
mono_assemblies_init (void)
{
	/*
	 * Initialize our internal paths if we have not been initialized yet.
	 * This happens when embedders use Mono.
	 */
	if (mono_assembly_getrootdir () == NULL)
		mono_set_rootdir ();

	check_path_env ();
	check_extra_gac_path_env ();

	InitializeCriticalSection (&assemblies_mutex);

	assemblies_loading = g_hash_table_new (NULL, NULL);
	assemblies_refonly_loading = g_hash_table_new (NULL, NULL);
}

gboolean
mono_assembly_fill_assembly_name (MonoImage *image, MonoAssemblyName *aname)
{
	MonoTableInfo *t = &image->tables [MONO_TABLE_ASSEMBLY];
	guint32 cols [MONO_ASSEMBLY_SIZE];

	if (!t->rows)
		return FALSE;

	mono_metadata_decode_row (t, 0, cols, MONO_ASSEMBLY_SIZE);

	aname->hash_len = 0;
	aname->hash_value = NULL;
	aname->name = mono_metadata_string_heap (image, cols [MONO_ASSEMBLY_NAME]);
	aname->culture = mono_metadata_string_heap (image, cols [MONO_ASSEMBLY_CULTURE]);
	aname->flags = cols [MONO_ASSEMBLY_FLAGS];
	aname->major = cols [MONO_ASSEMBLY_MAJOR_VERSION];
	aname->minor = cols [MONO_ASSEMBLY_MINOR_VERSION];
	aname->build = cols [MONO_ASSEMBLY_BUILD_NUMBER];
	aname->revision = cols [MONO_ASSEMBLY_REV_NUMBER];
	aname->hash_alg = cols [MONO_ASSEMBLY_HASH_ALG];
	if (cols [MONO_ASSEMBLY_PUBLIC_KEY]) {
		gchar* token = g_malloc (8);
		gchar* encoded;
		int len;

		aname->public_key = mono_metadata_blob_heap (image, cols [MONO_ASSEMBLY_PUBLIC_KEY]);
		len = mono_metadata_decode_blob_size (aname->public_key, (const char**)&aname->public_key);

		mono_digest_get_public_token (token, aname->public_key, len);
		encoded = encode_public_tok (token, 8);
		g_strlcpy (aname->public_key_token, encoded, MONO_PUBLIC_KEY_TOKEN_LENGTH);

		g_free (encoded);
		g_free (token);
	}
	else {
		aname->public_key = NULL;
		memset (aname->public_key_token, 0, MONO_PUBLIC_KEY_TOKEN_LENGTH);
	}

	if (cols [MONO_ASSEMBLY_PUBLIC_KEY]) {
		aname->public_key = mono_metadata_blob_heap (image, cols [MONO_ASSEMBLY_PUBLIC_KEY]);
	}
	else
		aname->public_key = 0;

	return TRUE;
}

/*
 * mono_stringify_assembly_name:
 *
 *   Convert @aname into its string format. The returned string is dynamically
 * allocated and should be freed by the caller.
 */
char*
mono_stringify_assembly_name (MonoAssemblyName *aname)
{
	return g_strdup_printf (
		"%s, Version=%d.%d.%d.%d, Culture=%s%s%s",
		aname->name,
		aname->major, aname->minor, aname->build, aname->revision,
		aname->culture && *aname->culture? aname->culture: "neutral",
		aname->public_key_token [0] ? ", PublicKeyToken=" : "",
		aname->public_key_token [0] ? (char *)aname->public_key_token : "");
}

static gchar*
assemblyref_public_tok (MonoImage *image, guint32 key_index, guint32 flags)
{
	const gchar *public_tok;
	int len;

	public_tok = mono_metadata_blob_heap (image, key_index);
	len = mono_metadata_decode_blob_size (public_tok, &public_tok);

	if (flags & ASSEMBLYREF_FULL_PUBLIC_KEY_FLAG) {
		gchar token [8];
		mono_digest_get_public_token (token, public_tok, len);
		return encode_public_tok (token, 8);
	}

	return encode_public_tok (public_tok, len);
}

/**
 * mono_assembly_addref:
 * @assemnly: the assembly to reference
 *
 * This routine increments the reference count on a MonoAssembly.
 * The reference count is reduced every time the method mono_assembly_close() is
 * invoked.
 */
void
mono_assembly_addref (MonoAssembly *assembly)
{
	InterlockedIncrement (&assembly->ref_count);
}

static MonoAssemblyName *
mono_assembly_remap_version (MonoAssemblyName *aname, MonoAssemblyName *dest_aname)
{
	const MonoRuntimeInfo *current_runtime;
	int pos, first, last;

	if (aname->name == NULL) return aname;
	current_runtime = mono_get_runtime_info ();

	first = 0;
	last = G_N_ELEMENTS (framework_assemblies) - 1;
	
	while (first <= last) {
		int res;
		pos = first + (last - first) / 2;
		res = strcmp (aname->name, framework_assemblies[pos].assembly_name);
		if (res == 0) {
			const AssemblyVersionSet* vset;
			int index = framework_assemblies[pos].version_set_index;
			g_assert (index < G_N_ELEMENTS (current_runtime->version_sets));
			vset = &current_runtime->version_sets [index];

			if (aname->major == vset->major && aname->minor == vset->minor &&
				aname->build == vset->build && aname->revision == vset->revision)
				return aname;
		
			if ((aname->major | aname->minor | aname->build | aname->revision) != 0)
				mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_ASSEMBLY,
					"The request to load the assembly %s v%d.%d.%d.%d was remapped to v%d.%d.%d.%d",
							aname->name,
							aname->major, aname->minor, aname->build, aname->revision,
							vset->major, vset->minor, vset->build, vset->revision
							);
			
			memcpy (dest_aname, aname, sizeof(MonoAssemblyName));
			dest_aname->major = vset->major;
			dest_aname->minor = vset->minor;
			dest_aname->build = vset->build;
			dest_aname->revision = vset->revision;
			return dest_aname;
		} else if (res < 0) {
			last = pos - 1;
		} else {
			first = pos + 1;
		}
	}
	return aname;
}

/*
 * mono_assembly_get_assemblyref:
 *
 *   Fill out ANAME with the assembly name of the INDEXth assembly reference in IMAGE.
 */
void
mono_assembly_get_assemblyref (MonoImage *image, int index, MonoAssemblyName *aname)
{
	MonoTableInfo *t;
	guint32 cols [MONO_ASSEMBLYREF_SIZE];
	const char *hash;

	t = &image->tables [MONO_TABLE_ASSEMBLYREF];

	mono_metadata_decode_row (t, index, cols, MONO_ASSEMBLYREF_SIZE);
		
	hash = mono_metadata_blob_heap (image, cols [MONO_ASSEMBLYREF_HASH_VALUE]);
	aname->hash_len = mono_metadata_decode_blob_size (hash, &hash);
	aname->hash_value = hash;
	aname->name = mono_metadata_string_heap (image, cols [MONO_ASSEMBLYREF_NAME]);
	aname->culture = mono_metadata_string_heap (image, cols [MONO_ASSEMBLYREF_CULTURE]);
	aname->flags = cols [MONO_ASSEMBLYREF_FLAGS];
	aname->major = cols [MONO_ASSEMBLYREF_MAJOR_VERSION];
	aname->minor = cols [MONO_ASSEMBLYREF_MINOR_VERSION];
	aname->build = cols [MONO_ASSEMBLYREF_BUILD_NUMBER];
	aname->revision = cols [MONO_ASSEMBLYREF_REV_NUMBER];

	if (cols [MONO_ASSEMBLYREF_PUBLIC_KEY]) {
		gchar *token = assemblyref_public_tok (image, cols [MONO_ASSEMBLYREF_PUBLIC_KEY], aname->flags);
		g_strlcpy (aname->public_key_token, token, MONO_PUBLIC_KEY_TOKEN_LENGTH);
		g_free (token);
	} else {
		memset (aname->public_key_token, 0, MONO_PUBLIC_KEY_TOKEN_LENGTH);
	}
}

void
mono_assembly_load_reference (MonoImage *image, int index)
{
	MonoAssembly *reference;
	MonoAssemblyName aname;
	MonoImageOpenStatus status;

	/*
	 * image->references is shared between threads, so we need to access
	 * it inside a critical section.
	 */
	mono_assemblies_lock ();
	reference = image->references [index];
	mono_assemblies_unlock ();
	if (reference)
		return;

	mono_assembly_get_assemblyref (image, index, &aname);

	if (image->assembly->ref_only) {
		/* We use the loaded corlib */
		if (!strcmp (aname.name, "mscorlib"))
			reference = mono_assembly_load_full (&aname, image->assembly->basedir, &status, FALSE);
		else
			reference = mono_assembly_loaded_full (&aname, TRUE);
		/*
		 * Here we must advice that the error was due to
		 * a non loaded reference using the ReflectionOnly api
		*/
		if (!reference)
			reference = REFERENCE_MISSING;
	} else
		reference = mono_assembly_load (&aname, image->assembly->basedir, &status);

	if (reference == NULL){
		char *extra_msg = g_strdup ("");

		if (status == MONO_IMAGE_ERROR_ERRNO && errno == ENOENT) {
			extra_msg = g_strdup_printf ("The assembly was not found in the Global Assembly Cache, a path listed in the MONO_PATH environment variable, or in the location of the executing assembly (%s).\n", image->assembly->basedir);
		} else if (status == MONO_IMAGE_ERROR_ERRNO) {
			extra_msg = g_strdup_printf ("System error: %s\n", strerror (errno));
		} else if (status == MONO_IMAGE_MISSING_ASSEMBLYREF) {
			extra_msg = g_strdup ("Cannot find an assembly referenced from this one.\n");
		} else if (status == MONO_IMAGE_IMAGE_INVALID) {
			extra_msg = g_strdup ("The file exists but is not a valid assembly.\n");
		}
		
		g_warning ("The following assembly referenced from %s could not be loaded:\n"
				   "     Assembly:   %s    (assemblyref_index=%d)\n"
				   "     Version:    %d.%d.%d.%d\n"
				   "     Public Key: %s\n%s",
				   image->name, aname.name, index,
				   aname.major, aname.minor, aname.build, aname.revision,
				   strlen(aname.public_key_token) == 0 ? "(none)" : (char*)aname.public_key_token, extra_msg);
		g_free (extra_msg);
	}

	mono_assemblies_lock ();
	if (reference == NULL) {
		/* Flag as not found */
		reference = REFERENCE_MISSING;
	}	

	if (!image->references [index]) {
		if (reference != REFERENCE_MISSING){
			mono_assembly_addref (reference);
			mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_ASSEMBLY, "Assembly Ref addref %s %p -> %s %p: %d\n",
				    image->assembly->aname.name, image->assembly, reference->aname.name, reference, reference->ref_count);
		} else {
			mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_ASSEMBLY, "Failed to load assembly %s %p\n",
				    image->assembly->aname.name, image->assembly);
		}
		
		image->references [index] = reference;
	}
	mono_assemblies_unlock ();

	if (image->references [index] != reference) {
		/* Somebody loaded it before us */
		mono_assembly_close (reference);
	}
}

void
mono_assembly_load_references (MonoImage *image, MonoImageOpenStatus *status)
{
	MonoTableInfo *t;
	int i;

	*status = MONO_IMAGE_OK;

	t = &image->tables [MONO_TABLE_ASSEMBLYREF];
	
	image->references = g_new0 (MonoAssembly *, t->rows + 1);

	/* resolve assembly references for modules */
	for (i = 0; i < image->module_count; i++){
		if (image->modules [i]) {
			image->modules [i]->assembly = image->assembly;
			mono_assembly_load_references (image->modules [i], status);
		}
	}
}

typedef struct AssemblyLoadHook AssemblyLoadHook;
struct AssemblyLoadHook {
	AssemblyLoadHook *next;
	MonoAssemblyLoadFunc func;
	gpointer user_data;
};

AssemblyLoadHook *assembly_load_hook = NULL;

void
mono_assembly_invoke_load_hook (MonoAssembly *ass)
{
	AssemblyLoadHook *hook;

	for (hook = assembly_load_hook; hook; hook = hook->next) {
		hook->func (ass, hook->user_data);
	}
}

void
mono_install_assembly_load_hook (MonoAssemblyLoadFunc func, gpointer user_data)
{
	AssemblyLoadHook *hook;
	
	g_return_if_fail (func != NULL);

	hook = g_new0 (AssemblyLoadHook, 1);
	hook->func = func;
	hook->user_data = user_data;
	hook->next = assembly_load_hook;
	assembly_load_hook = hook;
}

static void
free_assembly_load_hooks (void)
{
	AssemblyLoadHook *hook, *next;

	for (hook = assembly_load_hook; hook; hook = next) {
		next = hook->next;
		g_free (hook);
	}
}

typedef struct AssemblySearchHook AssemblySearchHook;
struct AssemblySearchHook {
	AssemblySearchHook *next;
	MonoAssemblySearchFunc func;
	gboolean refonly;
	gboolean postload;
	gpointer user_data;
};

AssemblySearchHook *assembly_search_hook = NULL;

static MonoAssembly*
mono_assembly_invoke_search_hook_internal (MonoAssemblyName *aname, gboolean refonly, gboolean postload)
{
	AssemblySearchHook *hook;

	for (hook = assembly_search_hook; hook; hook = hook->next) {
		if ((hook->refonly == refonly) && (hook->postload == postload)) {
			MonoAssembly *ass = hook->func (aname, hook->user_data);
			if (ass)
				return ass;
		}
	}

	return NULL;
}

MonoAssembly*
mono_assembly_invoke_search_hook (MonoAssemblyName *aname)
{
	return mono_assembly_invoke_search_hook_internal (aname, FALSE, FALSE);
}

static void
mono_install_assembly_search_hook_internal (MonoAssemblySearchFunc func, gpointer user_data, gboolean refonly, gboolean postload)
{
	AssemblySearchHook *hook;
	
	g_return_if_fail (func != NULL);

	hook = g_new0 (AssemblySearchHook, 1);
	hook->func = func;
	hook->user_data = user_data;
	hook->refonly = refonly;
	hook->postload = postload;
	hook->next = assembly_search_hook;
	assembly_search_hook = hook;
}

void          
mono_install_assembly_search_hook (MonoAssemblySearchFunc func, gpointer user_data)
{
	mono_install_assembly_search_hook_internal (func, user_data, FALSE, FALSE);
}	

static void
free_assembly_search_hooks (void)
{
	AssemblySearchHook *hook, *next;

	for (hook = assembly_search_hook; hook; hook = next) {
		next = hook->next;
		g_free (hook);
	}
}

void
mono_install_assembly_refonly_search_hook (MonoAssemblySearchFunc func, gpointer user_data)
{
	mono_install_assembly_search_hook_internal (func, user_data, TRUE, FALSE);
}

void          
mono_install_assembly_postload_search_hook (MonoAssemblySearchFunc func, gpointer user_data)
{
	mono_install_assembly_search_hook_internal (func, user_data, FALSE, TRUE);
}	

void
mono_install_assembly_postload_refonly_search_hook (MonoAssemblySearchFunc func, gpointer user_data)
{
	mono_install_assembly_search_hook_internal (func, user_data, TRUE, TRUE);
}

typedef struct AssemblyPreLoadHook AssemblyPreLoadHook;
struct AssemblyPreLoadHook {
	AssemblyPreLoadHook *next;
	MonoAssemblyPreLoadFunc func;
	gpointer user_data;
};

static AssemblyPreLoadHook *assembly_preload_hook = NULL;
static AssemblyPreLoadHook *assembly_refonly_preload_hook = NULL;

static MonoAssembly *
invoke_assembly_preload_hook (MonoAssemblyName *aname, gchar **assemblies_path)
{
	AssemblyPreLoadHook *hook;
	MonoAssembly *assembly;

	for (hook = assembly_preload_hook; hook; hook = hook->next) {
		assembly = hook->func (aname, assemblies_path, hook->user_data);
		if (assembly != NULL)
			return assembly;
	}

	return NULL;
}

static MonoAssembly *
invoke_assembly_refonly_preload_hook (MonoAssemblyName *aname, gchar **assemblies_path)
{
	AssemblyPreLoadHook *hook;
	MonoAssembly *assembly;

	for (hook = assembly_refonly_preload_hook; hook; hook = hook->next) {
		assembly = hook->func (aname, assemblies_path, hook->user_data);
		if (assembly != NULL)
			return assembly;
	}

	return NULL;
}

void
mono_install_assembly_preload_hook (MonoAssemblyPreLoadFunc func, gpointer user_data)
{
	AssemblyPreLoadHook *hook;
	
	g_return_if_fail (func != NULL);

	hook = g_new0 (AssemblyPreLoadHook, 1);
	hook->func = func;
	hook->user_data = user_data;
	hook->next = assembly_preload_hook;
	assembly_preload_hook = hook;
}

void
mono_install_assembly_refonly_preload_hook (MonoAssemblyPreLoadFunc func, gpointer user_data)
{
	AssemblyPreLoadHook *hook;
	
	g_return_if_fail (func != NULL);

	hook = g_new0 (AssemblyPreLoadHook, 1);
	hook->func = func;
	hook->user_data = user_data;
	hook->next = assembly_refonly_preload_hook;
	assembly_refonly_preload_hook = hook;
}

static void
free_assembly_preload_hooks (void)
{
	AssemblyPreLoadHook *hook, *next;

	for (hook = assembly_preload_hook; hook; hook = next) {
		next = hook->next;
		g_free (hook);
	}

	for (hook = assembly_refonly_preload_hook; hook; hook = next) {
		next = hook->next;
		g_free (hook);
	}
}

static gchar *
absolute_dir (const gchar *filename)
{
	gchar *cwd;
	gchar *mixed;
	gchar **parts;
	gchar *part;
	GList *list, *tmp;
	GString *result;
	gchar *res;
	gint i;

	if (g_path_is_absolute (filename))
		return g_path_get_dirname (filename);

	cwd = g_get_current_dir ();
	mixed = g_build_filename (cwd, filename, NULL);
	parts = g_strsplit (mixed, G_DIR_SEPARATOR_S, 0);
	g_free (mixed);
	g_free (cwd);

	list = NULL;
	for (i = 0; (part = parts [i]) != NULL; i++) {
		if (!strcmp (part, "."))
			continue;

		if (!strcmp (part, "..")) {
			if (list && list->next) /* Don't remove root */
				list = g_list_delete_link (list, list);
		} else {
			list = g_list_prepend (list, part);
		}
	}

	result = g_string_new ("");
	list = g_list_reverse (list);

	/* Ignores last data pointer, which should be the filename */
	for (tmp = list; tmp && tmp->next != NULL; tmp = tmp->next)
		if (tmp->data)
			g_string_append_printf (result, "%s%c", (char *) tmp->data,
								G_DIR_SEPARATOR);
	
	res = result->str;
	g_string_free (result, FALSE);
	g_list_free (list);
	g_strfreev (parts);
	if (*res == '\0') {
		g_free (res);
		return g_strdup (".");
	}

	return res;
}

/** 
 * mono_assembly_open_from_bundle:
 * @filename: Filename requested
 * @status: return value
 *
 * This routine tries to open the assembly specified by `filename' from the
 * defined bundles, if found, returns the MonoImage for it, if not found
 * returns NULL
 */
static MonoImage *
mono_assembly_open_from_bundle (const char *filename, MonoImageOpenStatus *status, gboolean refonly)
{
	int i;
	char *name = g_path_get_basename (filename);
	MonoImage *image = NULL;

	/*
	 * we do a very simple search for bundled assemblies: it's not a general 
	 * purpose assembly loading mechanism.
	 */
	mono_assemblies_lock ();
	for (i = 0; !image && bundles [i]; ++i) {
		if (strcmp (bundles [i]->name, name) == 0) {
			image = mono_image_open_from_data_full ((char*)bundles [i]->data, bundles [i]->size, FALSE, status, refonly);
			break;
		}
	}
	mono_assemblies_unlock ();
	g_free (name);
	if (image) {
		mono_image_addref (image);
		return image;
	}
	return NULL;
}

MonoAssembly *
mono_assembly_open_full (const char *filename, MonoImageOpenStatus *status, gboolean refonly)
{
	MonoImage *image;
	MonoAssembly *ass;
	MonoImageOpenStatus def_status;
	gchar *fname;
	
	g_return_val_if_fail (filename != NULL, NULL);

	if (!status)
		status = &def_status;
	*status = MONO_IMAGE_OK;

	if (strncmp (filename, "file://", 7) == 0) {
		GError *error = NULL;
		gchar *uri = (gchar *) filename;
		gchar *tmpuri;

		/*
		 * MS allows file://c:/... and fails on file://localhost/c:/... 
		 * They also throw an IndexOutOfRangeException if "file://"
		 */
		if (uri [7] != '/')
			uri = g_strdup_printf ("file:///%s", uri + 7);
	
		tmpuri = uri;
		uri = mono_escape_uri_string (tmpuri);
		fname = g_filename_from_uri (uri, NULL, &error);
		g_free (uri);

		if (tmpuri != filename)
			g_free (tmpuri);

		if (error != NULL) {
			g_warning ("%s\n", error->message);
			g_error_free (error);
			fname = g_strdup (filename);
		}
	} else {
		fname = g_strdup (filename);
	}

	mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_ASSEMBLY,
			"Assembly Loader probing location: '%s'.", filename);
	image = NULL;

	if (bundles != NULL)
		image = mono_assembly_open_from_bundle (fname, status, refonly);

	if (!image) {
		mono_assemblies_lock ();
		image = mono_image_open_full (fname, status, refonly);
		mono_assemblies_unlock ();
	}

	if (!image){
		if (*status == MONO_IMAGE_OK)
			*status = MONO_IMAGE_ERROR_ERRNO;
		g_free (fname);
		return NULL;
	}

	if (image->assembly) {
		/* Already loaded by another appdomain */
		mono_assembly_invoke_load_hook (image->assembly);
		mono_image_close (image);
		g_free (fname);
		return image->assembly;
	}

	ass = mono_assembly_load_from_full (image, fname, status, refonly);

	if (ass) {
		mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_ASSEMBLY,
				"Assembly Loader loaded assembly from location: '%s'.", filename);
		if (!refonly)
			mono_config_for_assembly (ass->image);
	}

	/* Clear the reference added by mono_image_open */
	mono_image_close (image);
	
	g_free (fname);

	return ass;
}

/*
 * load_friend_assemblies:
 * @ass: an assembly
 *
 * Load the list of friend assemblies that are allowed to access
 * the assembly's internal types and members. They are stored as assembly
 * names in custom attributes.
 */
static void
load_friend_assemblies (MonoAssembly* ass)
{
	int i;
	MonoCustomAttrInfo* attrs = mono_custom_attrs_from_assembly (ass);
	if (!attrs)
		return;
	for (i = 0; i < attrs->num_attrs; ++i) {
		MonoCustomAttrEntry *attr = &attrs->attrs [i];
		MonoAssemblyName *aname;
		const guchar *data;
		guint slen;
		/* Do some sanity checking */
		if (!attr->ctor || attr->ctor->klass != mono_defaults.internals_visible_class)
			continue;
		if (attr->data_size < 4)
			continue;
		data = attr->data;
		/* 0xFF means null string, see custom attr format */
		if (data [0] != 1 || data [1] != 0 || data [2] == 0xFF)
			continue;
		slen = mono_metadata_decode_value (data + 2, &data);
		aname = g_new0 (MonoAssemblyName, 1);
		/*g_print ("friend ass: %s\n", data);*/
		if (mono_assembly_name_parse_full (data, aname, TRUE, NULL)) {
			ass->friend_assembly_names = g_slist_prepend (ass->friend_assembly_names, aname);
		} else {
			g_free (aname);
		}
	}
	mono_custom_attrs_free (attrs);
}

/**
 * mono_assembly_open:
 * @filename: Opens the assembly pointed out by this name
 * @status: where a status code can be returned
 *
 * mono_assembly_open opens the PE-image pointed by @filename, and
 * loads any external assemblies referenced by it.
 *
 * Return: a pointer to the MonoAssembly if @filename contains a valid
 * assembly or NULL on error.  Details about the error are stored in the
 * @status variable.
 */
MonoAssembly *
mono_assembly_open (const char *filename, MonoImageOpenStatus *status)
{
	return mono_assembly_open_full (filename, status, FALSE);
}

MonoAssembly *
mono_assembly_load_from_full (MonoImage *image, const char*fname, 
			      MonoImageOpenStatus *status, gboolean refonly)
{
	MonoAssembly *ass, *ass2;
	char *base_dir;
	GList *loading;
	GHashTable *ass_loading;

#if defined (PLATFORM_WIN32)
	{
		gchar *tmp_fn;
		int i;

		tmp_fn = g_strdup (fname);
		for (i = strlen (tmp_fn) - 1; i >= 0; i--) {
			if (tmp_fn [i] == '/')
				tmp_fn [i] = '\\';
		}

		base_dir = absolute_dir (tmp_fn);
		g_free (tmp_fn);
	}
#else
	base_dir = absolute_dir (fname);
#endif

	/*
	 * To avoid deadlocks and scalability problems, we load assemblies outside
	 * the assembly lock. This means that multiple threads might try to load
	 * the same assembly at the same time. The first one to load it completely
	 * "wins", the other threads free their copy and use the one loaded by
	 * the winning thread.
	 */

	/*
	 * Create assembly struct, and enter it into the assembly cache
	 */
	ass = g_new0 (MonoAssembly, 1);
	ass->basedir = base_dir;
	ass->ref_only = refonly;
	ass->image = image;

	/* Add a non-temporary reference because of ass->image */
	mono_image_addref (image);

	mono_assembly_fill_assembly_name (image, &ass->aname);

	mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_ASSEMBLY, "Image addref %s %p -> %s %p: %d\n", ass->aname.name, ass, image->name, image, image->ref_count);

	/* 
	 * Atomically search the loaded list and add ourselves to it if necessary.
	 */
	mono_assemblies_lock ();
	if (ass->aname.name) {
		/* avoid loading the same assembly twice for now... */
		ass2 = search_loaded (&ass->aname, refonly);
		if (ass2) {
			g_free (ass);
			g_free (base_dir);
			mono_image_close (image);
			*status = MONO_IMAGE_OK;
			mono_assemblies_unlock ();
			return ass2;
		}
	}
	ass_loading = refonly ? assemblies_refonly_loading : assemblies_loading;
	loading = g_hash_table_lookup (ass_loading, (gpointer)GetCurrentThreadId ());
	loading = g_list_prepend (loading, ass);
	g_hash_table_insert (ass_loading, (gpointer)GetCurrentThreadId (), loading);
	mono_assemblies_unlock ();

	g_assert (image->assembly == NULL);
	image->assembly = ass;

	mono_assembly_load_references (image, status);

	mono_assemblies_lock ();

	loading = g_hash_table_lookup (ass_loading, (gpointer)GetCurrentThreadId ());
	loading = g_list_remove (loading, ass);
	if (loading == NULL)
		/* Prevent memory leaks */
		g_hash_table_remove (ass_loading, (gpointer)GetCurrentThreadId ());
	else
		g_hash_table_insert (ass_loading, (gpointer)GetCurrentThreadId (), loading);
	if (*status != MONO_IMAGE_OK) {
		mono_assemblies_unlock ();
		mono_assembly_close (ass);
		return NULL;
	}

	if (ass->aname.name) {
		ass2 = search_loaded (&ass->aname, refonly);
		if (ass2) {
			/* Somebody else has loaded the assembly before us */
			mono_assemblies_unlock ();
			mono_assembly_close (ass);
			return ass2;
		}
	}

	loaded_assemblies = g_list_prepend (loaded_assemblies, ass);
	if (mono_defaults.internals_visible_class)
		load_friend_assemblies (ass);
	mono_assemblies_unlock ();

	mono_assembly_invoke_load_hook (ass);

	return ass;
}

MonoAssembly *
mono_assembly_load_from (MonoImage *image, const char *fname,
			 MonoImageOpenStatus *status)
{
	return mono_assembly_load_from_full (image, fname, status, FALSE);
}

/**
* mono_assembly_name_free:
* @aname: assembly name to free
* 
* Frees the provided assembly name object.
* (it does not frees the object itself, only the name members).
*/
void
mono_assembly_name_free (MonoAssemblyName *aname)
{
	if (aname == NULL)
		return;

	g_free ((void *) aname->name);
	g_free ((void *) aname->culture);
	g_free ((void *) aname->hash_value);
}

static gboolean
parse_public_key (const gchar *key, gchar** pubkey)
{
	const gchar *pkey;
	gchar header [16], val, *arr;
	gint i, j, offset, bitlen, keylen, pkeylen;
	
	keylen = strlen (key) >> 1;
	if (keylen < 1)
		return FALSE;
	
	val = g_ascii_xdigit_value (key [0]) << 4;
	val |= g_ascii_xdigit_value (key [1]);
	switch (val) {
		case 0x00:
			if (keylen < 13)
				return FALSE;
			val = g_ascii_xdigit_value (key [24]);
			val |= g_ascii_xdigit_value (key [25]);
			if (val != 0x06)
				return FALSE;
			pkey = key + 24;
			break;
		case 0x06:
			pkey = key;
			break;
		default:
			return FALSE;
	}
		
	/* We need the first 16 bytes
	* to check whether this key is valid or not */
	pkeylen = strlen (pkey) >> 1;
	if (pkeylen < 16)
		return FALSE;
		
	for (i = 0, j = 0; i < 16; i++) {
		header [i] = g_ascii_xdigit_value (pkey [j++]) << 4;
		header [i] |= g_ascii_xdigit_value (pkey [j++]);
	}

	if (header [0] != 0x06 || /* PUBLICKEYBLOB (0x06) */
			header [1] != 0x02 || /* Version (0x02) */
			header [2] != 0x00 || /* Reserved (word) */
			header [3] != 0x00 ||
			(guint)(read32 (header + 8)) != 0x31415352) /* DWORD magic = RSA1 */
		return FALSE;

	/* Based on this length, we _should_ be able to know if the length is right */
	bitlen = read32 (header + 12) >> 3;
	if ((bitlen + 16 + 4) != pkeylen)
		return FALSE;
		
	/* Encode the size of the blob */
	offset = 0;
	if (keylen <= 127) {
		arr = g_malloc (keylen + 1);
		arr [offset++] = keylen;
	} else {
		arr = g_malloc (keylen + 2);
		arr [offset++] = 0x80; /* 10bs */
		arr [offset++] = keylen;
	}
		
	for (i = offset, j = 0; i < keylen + offset; i++) {
		arr [i] = g_ascii_xdigit_value (key [j++]) << 4;
		arr [i] |= g_ascii_xdigit_value (key [j++]);
	}
	if (pubkey)
		*pubkey = arr;

	return TRUE;
}

static gboolean
build_assembly_name (const char *name, const char *version, const char *culture, const char *token, const char *key, MonoAssemblyName *aname, gboolean save_public_key)
{
	gint major, minor, build, revision;
	gint len;
	gchar *pkey, *pkeyptr, *encoded, tok [8];

	memset (aname, 0, sizeof (MonoAssemblyName));

	if (version) {
		if (sscanf (version, "%u.%u.%u.%u", &major, &minor, &build, &revision) != 4)
			return FALSE;

		aname->major = major;
		aname->minor = minor;
		aname->build = build;
		aname->revision = revision;
	}
	
	aname->name = g_strdup (name);
	
	if (culture) {
		if (g_ascii_strcasecmp (culture, "neutral") == 0)
			aname->culture = g_strdup ("");
		else
			aname->culture = g_strdup (culture);
	}
	
	if (token && strncmp (token, "null", 4) != 0) {
		char *lower = g_ascii_strdown (token, MONO_PUBLIC_KEY_TOKEN_LENGTH);
		g_strlcpy ((char*)aname->public_key_token, lower, MONO_PUBLIC_KEY_TOKEN_LENGTH);
		g_free (lower);
	}

	if (key && strncmp (key, "null", 4) != 0) {
		if (!parse_public_key (key, &pkey)) {
			mono_assembly_name_free (aname);
			return FALSE;
		}
		
		len = mono_metadata_decode_blob_size ((const gchar *) pkey, (const gchar **) &pkeyptr);
		// We also need to generate the key token
		mono_digest_get_public_token ((guchar*) tok, (guint8*) pkeyptr, len);
		encoded = encode_public_tok ((guchar*) tok, 8);
		g_strlcpy ((gchar*)aname->public_key_token, encoded, MONO_PUBLIC_KEY_TOKEN_LENGTH);
		g_free (encoded);

		if (save_public_key)
			aname->public_key = (guint8*) pkey;
		else
			g_free (pkey);
	}
	
	return TRUE;
}

static gboolean
parse_assembly_directory_name (const char *name, const char *dirname, MonoAssemblyName *aname)
{
	gchar **parts;
	gboolean res;
	
	parts = g_strsplit (dirname, "_", 3);
	if (!parts || !parts[0] || !parts[1] || !parts[2]) {
		g_strfreev (parts);
		return FALSE;
	}
	
	res = build_assembly_name (name, parts[0], parts[1], parts[2], NULL, aname, FALSE);
	g_strfreev (parts);
	return res;
}

gboolean
mono_assembly_name_parse_full (const char *name, MonoAssemblyName *aname, gboolean save_public_key, gboolean *is_version_defined)
{
	gchar *dllname;
	gchar *version = NULL;
	gchar *culture = NULL;
	gchar *token = NULL;
	gchar *key = NULL;
	gboolean res;
	gchar *value;
	gchar **parts;
	gchar **tmp;
	gboolean version_defined;

	if (!is_version_defined)
		is_version_defined = &version_defined;
	*is_version_defined = FALSE;
	
	parts = tmp = g_strsplit (name, ",", 4);
	if (!tmp || !*tmp) {
		g_strfreev (tmp);
		return FALSE;
	}

	dllname = g_strstrip (*tmp);
	
	tmp++;

	while (*tmp) {
		value = g_strstrip (*tmp);
		if (!g_ascii_strncasecmp (value, "Version=", 8)) {
			*is_version_defined = TRUE;
			version = g_strstrip (value + 8);
			tmp++;
			continue;
		}

		if (!g_ascii_strncasecmp (value, "Culture=", 8)) {
			culture = g_strstrip (value + 8);
			tmp++;
			continue;
		}

		if (!g_ascii_strncasecmp (value, "PublicKeyToken=", 15)) {
			token = g_strstrip (value + 15);
			tmp++;
			continue;
		}

		if (!g_ascii_strncasecmp (value, "PublicKey=", 10)) {
			key = g_strstrip (value + 10);
			tmp++;
			continue;
		}
		
		g_strfreev (parts);
		return FALSE;
	}

	res = build_assembly_name (dllname, version, culture, token, key, aname, save_public_key);
	g_strfreev (parts);
	return res;
}

/**
* mono_assembly_name_parse:
* @name: name to parse
* @aname: the destination assembly name
* 
* Parses an assembly qualified type name and assigns the name,
* version, culture and token to the provided assembly name object.
*
* Returns: true if the name could be parsed.
*/
gboolean
mono_assembly_name_parse (const char *name, MonoAssemblyName *aname)
{
	return mono_assembly_name_parse_full (name, aname, FALSE, NULL);
}

static MonoAssembly*
probe_for_partial_name (const char *basepath, const char *fullname, MonoAssemblyName *aname, MonoImageOpenStatus *status)
{
	gchar *fullpath = NULL;
	GDir *dirhandle;
	const char* direntry;
	MonoAssemblyName gac_aname;
	gint major=-1, minor=0, build=0, revision=0;
	gboolean exact_version;
	
	dirhandle = g_dir_open (basepath, 0, NULL);
	if (!dirhandle)
		return NULL;
		
	exact_version = (aname->major | aname->minor | aname->build | aname->revision) != 0;

	while ((direntry = g_dir_read_name (dirhandle))) {
		gboolean match = TRUE;
		
		parse_assembly_directory_name (aname->name, direntry, &gac_aname);
		
		if (aname->culture != NULL && strcmp (aname->culture, gac_aname.culture) != 0)
			match = FALSE;
			
		if (match && strlen ((char*)aname->public_key_token) > 0 && 
				strcmp ((char*)aname->public_key_token, (char*)gac_aname.public_key_token) != 0)
			match = FALSE;
		
		if (match) {
			if (exact_version) {
				match = (aname->major == gac_aname.major && aname->minor == gac_aname.minor &&
						 aname->build == gac_aname.build && aname->revision == gac_aname.revision); 
			}
			else if (gac_aname.major < major)
				match = FALSE;
			else if (gac_aname.major == major) {
				if (gac_aname.minor < minor)
					match = FALSE;
				else if (gac_aname.minor == minor) {
					if (gac_aname.build < build)
						match = FALSE;
					else if (gac_aname.build == build && gac_aname.revision <= revision)
						match = FALSE; 
				}
			}
		}
		
		if (match) {
			major = gac_aname.major;
			minor = gac_aname.minor;
			build = gac_aname.build;
			revision = gac_aname.revision;
			g_free (fullpath);
			fullpath = g_build_path (G_DIR_SEPARATOR_S, basepath, direntry, fullname, NULL);
		}

		mono_assembly_name_free (&gac_aname);
	}
	
	g_dir_close (dirhandle);
	
	if (fullpath == NULL)
		return NULL;
	else {
		MonoAssembly *res = mono_assembly_open (fullpath, status);
		g_free (fullpath);
		return res;
	}
}

MonoAssembly*
mono_assembly_load_with_partial_name (const char *name, MonoImageOpenStatus *status)
{
	MonoAssembly *res;
	MonoAssemblyName *aname, base_name, maped_aname;
	gchar *fullname, *gacpath;
	gchar **paths;

	memset (&base_name, 0, sizeof (MonoAssemblyName));
	aname = &base_name;

	if (!mono_assembly_name_parse (name, aname))
		return NULL;

	/* 
	 * If no specific version has been requested, make sure we load the
	 * correct version for system assemblies.
	 */ 
	if ((aname->major | aname->minor | aname->build | aname->revision) == 0)
		aname = mono_assembly_remap_version (aname, &maped_aname);
	
	res = mono_assembly_loaded (aname);
	if (res) {
		mono_assembly_name_free (aname);
		return res;
	}

	res = invoke_assembly_preload_hook (aname, assemblies_path);
	if (res) {
		res->in_gac = FALSE;
		mono_assembly_name_free (aname);
		return res;
	}

	fullname = g_strdup_printf ("%s.dll", aname->name);

	if (extra_gac_paths) {
		paths = extra_gac_paths;
		while (!res && *paths) {
			gacpath = g_build_path (G_DIR_SEPARATOR_S, *paths, "lib", "mono", "gac", aname->name, NULL);
			res = probe_for_partial_name (gacpath, fullname, aname, status);
			g_free (gacpath);
			paths++;
		}
	}

	if (res) {
		res->in_gac = TRUE;
		g_free (fullname);
		mono_assembly_name_free (aname);
		return res;
	}

	gacpath = g_build_path (G_DIR_SEPARATOR_S, mono_assembly_getrootdir (), "mono", "gac", aname->name, NULL);
	res = probe_for_partial_name (gacpath, fullname, aname, status);
	g_free (gacpath);

	if (res)
		res->in_gac = TRUE;

	g_free (fullname);
	mono_assembly_name_free (aname);

	return res;
}

static MonoImage*
mono_assembly_load_publisher_policy (MonoAssemblyName *aname)
{
	MonoImage *image;
	gchar *filename, *pname, *name, *culture, *version, *fullpath, *subpath;
	gchar **paths;
	gint32 len;

	if (strstr (aname->name, ".dll")) {
		len = strlen (aname->name) - 4;
		name = g_malloc (len);
		strncpy (name, aname->name, len);
	} else
		name = g_strdup (aname->name);
	
	if (aname->culture) {
		culture = g_strdup (aname->culture);
		g_strdown (culture);
	} else
		culture = g_strdup ("");
	
	pname = g_strdup_printf ("policy.%d.%d.%s", aname->major, aname->minor, name);
	version = g_strdup_printf ("0.0.0.0_%s_%s", culture, aname->public_key_token);
	g_free (name);
	g_free (culture);
	
	filename = g_strconcat (pname, ".dll", NULL);
	subpath = g_build_path (G_DIR_SEPARATOR_S, pname, version, filename, NULL);
	g_free (pname);
	g_free (version);
	g_free (filename);

	image = NULL;
	if (extra_gac_paths) {
		paths = extra_gac_paths;
		while (!image && *paths) {
			fullpath = g_build_path (G_DIR_SEPARATOR_S, *paths,
					"lib", "mono", "gac", subpath, NULL);
			image = mono_image_open (fullpath, NULL);
			g_free (fullpath);
			paths++;
		}
	}

	if (image) {
		g_free (subpath);
		return image;
	}

	fullpath = g_build_path (G_DIR_SEPARATOR_S, mono_assembly_getrootdir (), 
			"mono", "gac", subpath, NULL);
	image = mono_image_open (fullpath, NULL);
	g_free (subpath);
	g_free (fullpath);
	
	return image;
}

static MonoAssemblyName*
mono_assembly_bind_version (MonoAssemblyBindingInfo *info, MonoAssemblyName *aname, MonoAssemblyName *dest_name)
{
	memcpy (dest_name, aname, sizeof (MonoAssemblyName));
	dest_name->major = info->new_version.major;
	dest_name->minor = info->new_version.minor;
	dest_name->build = info->new_version.build;
	dest_name->revision = info->new_version.revision;
	
	return dest_name;
}

/* LOCKING: Assumes that we are already locked */
static MonoAssemblyBindingInfo*
search_binding_loaded (MonoAssemblyName *aname)
{
	GSList *tmp;

	for (tmp = loaded_assembly_bindings; tmp; tmp = tmp->next) {
		MonoAssemblyBindingInfo *info = tmp->data;
		if (assembly_binding_maps_name (info, aname))
			return info;
	}

	return NULL;
}

static MonoAssemblyName*
mono_assembly_apply_binding (MonoAssemblyName *aname, MonoAssemblyName *dest_name)
{
	MonoAssemblyBindingInfo *info, *info2;
	MonoImage *ppimage;

	if (aname->public_key_token [0] == 0)
		return aname;

	mono_loader_lock ();
	info = search_binding_loaded (aname);
	mono_loader_unlock ();
	if (info) {
		if (!check_policy_versions (info, aname))
			return aname;
		
		mono_assembly_bind_version (info, aname, dest_name);
		return dest_name;
	}

	info = g_new0 (MonoAssemblyBindingInfo, 1);
	info->major = aname->major;
	info->minor = aname->minor;
	
	ppimage = mono_assembly_load_publisher_policy (aname);
	if (ppimage) {
		get_publisher_policy_info (ppimage, aname, info);
		mono_image_close (ppimage);
	}

	/* Define default error value if needed */
	if (!info->is_valid) {
		info->name = g_strdup (aname->name);
		info->culture = g_strdup (aname->culture);
		g_strlcpy ((char *)info->public_key_token, (const char *)aname->public_key_token, MONO_PUBLIC_KEY_TOKEN_LENGTH);
	}
	
	mono_loader_lock ();
	info2 = search_binding_loaded (aname);
	if (info2) {
		/* This binding was added by another thread 
		 * before us */
		mono_assembly_binding_info_free (info);
		g_free (info);
		
		info = info2;
	} else
		loaded_assembly_bindings = g_slist_prepend (loaded_assembly_bindings, info);
		
	mono_loader_unlock ();
	
	if (!info->is_valid || !check_policy_versions (info, aname))
		return aname;

	mono_assembly_bind_version (info, aname, dest_name);
	return dest_name;
}

/**
 * mono_assembly_load_from_gac
 *
 * @aname: The assembly name object
 */
static MonoAssembly*
mono_assembly_load_from_gac (MonoAssemblyName *aname,  gchar *filename, MonoImageOpenStatus *status, MonoBoolean refonly)
{
	MonoAssembly *result = NULL;
	gchar *name, *version, *culture, *fullpath, *subpath;
	gint32 len;
	gchar **paths;

	if (aname->public_key_token [0] == 0) {
		return NULL;
	}

	if (strstr (aname->name, ".dll")) {
		len = strlen (filename) - 4;
		name = g_malloc (len);
		strncpy (name, aname->name, len);
	} else {
		name = g_strdup (aname->name);
	}

	if (aname->culture) {
		culture = g_strdup (aname->culture);
		g_strdown (culture);
	} else {
		culture = g_strdup ("");
	}

	version = g_strdup_printf ("%d.%d.%d.%d_%s_%s", aname->major,
			aname->minor, aname->build, aname->revision,
			culture, aname->public_key_token);
	
	subpath = g_build_path (G_DIR_SEPARATOR_S, name, version, filename, NULL);
	g_free (name);
	g_free (version);
	g_free (culture);

	if (extra_gac_paths) {
		paths = extra_gac_paths;
		while (!result && *paths) {
			fullpath = g_build_path (G_DIR_SEPARATOR_S, *paths, "lib", "mono", "gac", subpath, NULL);
			result = mono_assembly_open_full (fullpath, status, refonly);
			g_free (fullpath);
			paths++;
		}
	}

	if (result) {
		result->in_gac = TRUE;
		g_free (subpath);
		return result;
	}

	fullpath = g_build_path (G_DIR_SEPARATOR_S, mono_assembly_getrootdir (),
			"mono", "gac", subpath, NULL);
	result = mono_assembly_open_full (fullpath, status, refonly);
	g_free (fullpath);

	if (result)
		result->in_gac = TRUE;
	
	g_free (subpath);

	return result;
}


MonoAssembly*
mono_assembly_load_corlib (const MonoRuntimeInfo *runtime, MonoImageOpenStatus *status)
{
	char *corlib_file;

	if (corlib) {
		/* g_print ("corlib already loaded\n"); */
		return corlib;
	}
	
	if (assemblies_path) {
		corlib = load_in_path ("mscorlib.dll", (const char**)assemblies_path, status, FALSE);
		if (corlib)
			return corlib;
	}

	/* Load corlib from mono/<version> */
	
	corlib_file = g_build_filename ("mono", runtime->framework_version, "mscorlib.dll", NULL);
	if (assemblies_path) {
		corlib = load_in_path (corlib_file, (const char**)assemblies_path, status, FALSE);
		if (corlib) {
			g_free (corlib_file);
			return corlib;
		}
	}
	corlib = load_in_path (corlib_file, default_path, status, FALSE);
	g_free (corlib_file);

	return corlib;
}

/**
 * mono_assembly_load_full:
 * @aname: A MonoAssemblyName with the assembly name to load.
 * @basedir: A directory to look up the assembly at.
 * @status: a pointer to a MonoImageOpenStatus to return the status of the load operation
 * @refonly: Whether this assembly is being opened in "reflection-only" mode.
 *
 * Loads the assembly referenced by @aname, if the value of @basedir is not NULL, it
 * attempts to load the assembly from that directory before probing the standard locations.
 *
 * If the assembly is being opened in reflection-only mode (@refonly set to TRUE) then no 
 * assembly binding takes place.
 *
 * Returns: the assembly referenced by @aname loaded or NULL on error.   On error the
 * value pointed by status is updated with an error code.
 */
MonoAssembly*
mono_assembly_load_full (MonoAssemblyName *aname, const char *basedir, MonoImageOpenStatus *status, gboolean refonly)
{
	MonoAssembly *result;
	char *fullpath, *filename;
	MonoAssemblyName maped_aname, maped_name_pp;
	int ext_index;
	const char *ext;
	int len;

	aname = mono_assembly_remap_version (aname, &maped_aname);
	
	/* Reflection only assemblies don't get assembly binding */
	if (!refonly)
		aname = mono_assembly_apply_binding (aname, &maped_name_pp);
	
	result = mono_assembly_loaded_full (aname, refonly);
	if (result)
		return result;

	result = refonly ? invoke_assembly_refonly_preload_hook (aname, assemblies_path) : invoke_assembly_preload_hook (aname, assemblies_path);
	if (result) {
		result->in_gac = FALSE;
		return result;
	}

	/* Currently we retrieve the loaded corlib for reflection 
	 * only requests, like a common reflection only assembly 
	 */
	if (strcmp (aname->name, "mscorlib") == 0 || strcmp (aname->name, "mscorlib.dll") == 0) {
		return mono_assembly_load_corlib (mono_get_runtime_info (), status);
	}

	len = strlen (aname->name);
	for (ext_index = 0; ext_index < 2; ext_index ++) {
		ext = ext_index == 0 ? ".dll" : ".exe";
		if (len > 4 && (!strcmp (aname->name + len - 4, ".dll") || !strcmp (aname->name + len - 4, ".exe"))) {
			filename = g_strdup (aname->name);
			/* Don't try appending .dll/.exe if it already has one of those extensions */
			ext_index++;
		} else {
			filename = g_strconcat (aname->name, ext, NULL);
		}

		result = mono_assembly_load_from_gac (aname, filename, status, refonly);
		if (result) {
			g_free (filename);
			return result;
		}

		if (basedir) {
			fullpath = g_build_filename (basedir, filename, NULL);
			result = mono_assembly_open_full (fullpath, status, refonly);
			g_free (fullpath);
			if (result) {
				result->in_gac = FALSE;
				g_free (filename);
				return result;
			}
		}

		result = load_in_path (filename, default_path, status, refonly);
		if (result)
			result->in_gac = FALSE;
		g_free (filename);
		if (result)
			return result;
	}

	/* Try a postload search hook */
	result = mono_assembly_invoke_search_hook_internal (aname, refonly, TRUE);

	return result;
}

/**
 * mono_assembly_load:
 * @aname: A MonoAssemblyName with the assembly name to load.
 * @basedir: A directory to look up the assembly at.
 * @status: a pointer to a MonoImageOpenStatus to return the status of the load operation
 *
 * Loads the assembly referenced by @aname, if the value of @basedir is not NULL, it
 * attempts to load the assembly from that directory before probing the standard locations.
 *
 * Returns: the assembly referenced by @aname loaded or NULL on error.   On error the
 * value pointed by status is updated with an error code.
 */
MonoAssembly*
mono_assembly_load (MonoAssemblyName *aname, const char *basedir, MonoImageOpenStatus *status)
{
	return mono_assembly_load_full (aname, basedir, status, FALSE);
}
	
MonoAssembly*
mono_assembly_loaded_full (MonoAssemblyName *aname, gboolean refonly)
{
	MonoAssembly *res;
	MonoAssemblyName maped_aname;

	aname = mono_assembly_remap_version (aname, &maped_aname);

	mono_assemblies_lock ();
	res = search_loaded (aname, refonly);
	mono_assemblies_unlock ();

	return res;
}

/**
 * mono_assembly_loaded:
 * @aname: an assembly to look for.
 *
 * Returns: NULL If the given @aname assembly has not been loaded, or a pointer to
 * a MonoAssembly that matches the MonoAssemblyName specified.
 */
MonoAssembly*
mono_assembly_loaded (MonoAssemblyName *aname)
{
	return mono_assembly_loaded_full (aname, FALSE);
}

/**
 * mono_assembly_close:
 * @assembly: the assembly to release.
 *
 * This method releases a reference to the @assembly.  The assembly is
 * only released when all the outstanding references to it are released.
 */
void
mono_assembly_close (MonoAssembly *assembly)
{
	GSList *tmp;
	g_return_if_fail (assembly != NULL);

	if (assembly == REFERENCE_MISSING)
		return;
	
	/* Might be 0 already */
	if (InterlockedDecrement (&assembly->ref_count) > 0)
		return;

	mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_ASSEMBLY, "Unloading assembly %s [%p].", assembly->aname.name, assembly);

	mono_assemblies_lock ();
	loaded_assemblies = g_list_remove (loaded_assemblies, assembly);
	mono_assemblies_unlock ();

	if (assembly->image->references) {
		int i;

		for (i = 0; assembly->image->references [i]; i++) {
			if (assembly->image->references [i])
				mono_assembly_close (assembly->image->references [i]);
		}

		g_free (assembly->image->references);
		assembly->image->references = NULL;
	}

	assembly->image->assembly = NULL;

	mono_image_close (assembly->image);

	for (tmp = assembly->friend_assembly_names; tmp; tmp = tmp->next) {
		MonoAssemblyName *fname = tmp->data;
		mono_assembly_name_free (fname);
		g_free (fname);
	}
	g_slist_free (assembly->friend_assembly_names);
	g_free (assembly->basedir);
	if (assembly->dynamic) {
		g_free ((char*)assembly->aname.culture);
	} else {
		g_free (assembly);
	}
}

MonoImage*
mono_assembly_load_module (MonoAssembly *assembly, guint32 idx)
{
	MonoImageOpenStatus status;
	MonoImage *module;

	module = mono_image_load_file_for_image (assembly->image, idx);
	if (module)
		mono_assembly_load_references (module, &status);

	return module;
}

void
mono_assembly_foreach (GFunc func, gpointer user_data)
{
	GList *copy;

	/*
	 * We make a copy of the list to avoid calling the callback inside the 
	 * lock, which could lead to deadlocks.
	 */
	mono_assemblies_lock ();
	copy = g_list_copy (loaded_assemblies);
	mono_assemblies_unlock ();

	g_list_foreach (loaded_assemblies, func, user_data);

	g_list_free (copy);
}

/**
 * mono_assemblies_cleanup:
 *
 * Free all resources used by this module.
 */
void
mono_assemblies_cleanup (void)
{
	GSList *l;

	DeleteCriticalSection (&assemblies_mutex);

	g_hash_table_destroy (assemblies_loading);
	g_hash_table_destroy (assemblies_refonly_loading);

	for (l = loaded_assembly_bindings; l; l = l->next) {
		MonoAssemblyBindingInfo *info = l->data;

		mono_assembly_binding_info_free (info);
		g_free (info);
	}
	g_slist_free (loaded_assembly_bindings);

	free_assembly_load_hooks ();
	free_assembly_search_hooks ();
	free_assembly_preload_hooks ();
}

/*
 * Holds the assembly of the application, for
 * System.Diagnostics.Process::MainModule
 */
static MonoAssembly *main_assembly=NULL;

void
mono_assembly_set_main (MonoAssembly *assembly)
{
	main_assembly = assembly;
}

/**
 * mono_assembly_get_main:
 *
 * Returns: the assembly for the application, the first assembly that is loaded by the VM
 */
MonoAssembly *
mono_assembly_get_main (void)
{
	return (main_assembly);
}

/**
 * mono_assembly_get_image:
 * @assembly: The assembly to retrieve the image from
 *
 * Returns: the MonoImage associated with this assembly.
 */
MonoImage*
mono_assembly_get_image (MonoAssembly *assembly)
{
	return assembly->image;
}

void
mono_register_bundled_assemblies (const MonoBundledAssembly **assemblies)
{
	bundles = assemblies;
}
