/mono/metadata/assembly.c

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/*
 * assembly.c: Routines for loading assemblies.
 * 
 * Author:
 *   Miguel de Icaza (miguel@ximian.com)
 *
 * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
 * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
 * Copyright 2011 Xamarin, Inc (http://www.xamarin.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 "object-internals.h"
#include <mono/metadata/loader.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/metadata-internals.h>
#include <mono/metadata/profiler-private.h>
#include <mono/metadata/class-internals.h>
#include <mono/metadata/domain-internals.h>
#include <mono/metadata/mono-endian.h>
#include <mono/metadata/mono-debug.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-internal.h>
#include <mono/utils/mono-path.h>
#include <mono/metadata/reflection.h>
#include <mono/metadata/coree.h>
#include <mono/utils/mono-io-portability.h>

#ifndef HOST_WIN32
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#endif

#ifdef PLATFORM_MACOSX
#include <mach-o/dyld.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;

#ifndef DISABLE_ASSEMBLY_REMAPPING
/* The list of system assemblies what will be remapped to the running
 * runtime version. WARNING: this list must be sorted.
 * The integer number is an index in the MonoRuntimeInfo structure, whose
 * values can be found in domain.c - supported_runtimes. Look there
 * to understand what remapping will be made.
 */
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.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.ComponentModel.DataAnnotations", 2},
	{"System.Configuration", 0},
	{"System.Configuration.Install", 0},
	{"System.Core", 2},
	{"System.Data", 0},
	{"System.Data.Linq", 2},
	{"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", 3},
	{"System.Runtime.Serialization.Formatters.Soap", 0},
	{"System.Security", 0},
	{"System.ServiceProcess", 0},
	{"System.Transactions", 0},
	{"System.Web", 0},
	{"System.Web.Abstractions", 2},
	{"System.Web.Mobile", 0},
	{"System.Web.Routing", 2},
	{"System.Web.Services", 0},
	{"System.Windows.Forms", 0},
	{"System.Xml", 0},
	{"mscorlib", 0}
};
#endif

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

#if defined(__native_client__)

/* On Native Client, allow mscorlib to be loaded from memory  */
/* instead of loaded off disk.  If these are not set, default */
/* mscorlib loading will take place                           */

/* NOTE: If mscorlib data is passed to mono in this way then */
/* it needs to remain allocated during the use of mono.      */

static void *corlibData = NULL;
static size_t corlibSize = 0;

void
mono_set_corlib_data (void *data, size_t size)
{
  corlibData = data;
  corlibSize = size;
}

#endif

/* 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;

/* 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 MonoBoolean
mono_assembly_is_in_gac (const gchar *filanem);

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;
}

/**
 * mono_public_tokens_are_equal:
 * @pubt1: first public key token
 * @pubt2: second public key token
 *
 * Compare two public key tokens and return #TRUE is they are equal and #FALSE
 * otherwise.
 */
gboolean
mono_public_tokens_are_equal (const unsigned char *pubt1, const unsigned char *pubt2)
{
	return memcmp (pubt1, pubt2, 16) == 0;
}

/**
 * mono_set_assemblies_path:
 * @path: list of paths that contain directories where Mono will look for assemblies
 *
 * Use this method to override the standard assembly lookup system and
 * override any assemblies coming from the GAC.  This is the method
 * that supports the MONO_PATH variable.
 *
 * Notice that MONO_PATH and this method are really a very bad idea as
 * it prevents the GAC from working and it prevents the standard
 * resolution mechanisms from working.  Nonetheless, for some debugging
 * situations and bootstrapping setups, this is useful to have. 
 */
void
mono_set_assemblies_path (const char* path)
{
	char **splitted, **dest;
	
	splitted = g_strsplit (path, G_SEARCHPATH_SEPARATOR_S, 1000);
	if (assemblies_path)
		g_strfreev (assemblies_path);
	assemblies_path = dest = splitted;
	while (*splitted){
		if (**splitted)
			*dest++ = *splitted;
		splitted++;
	}
	*dest = *splitted;
	
	if (g_getenv ("MONO_DEBUG") == NULL)
		return;

	splitted = assemblies_path;
	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++;
	}
}

/* Native Client can't get this info from an environment variable so */
/* it's passed in to the runtime, or set manually by embedding code. */
#ifdef __native_client__
char* nacl_mono_path = NULL;
#endif

static void
check_path_env (void)
{
	const char* path;
#ifdef __native_client__
	path = nacl_mono_path;
#else
	path = g_getenv ("MONO_PATH");
#endif
	if (!path || assemblies_path != NULL)
		return;

	mono_set_assemblies_path(path);
}

static void
check_extra_gac_path_env (void) {
	const char *path;
	char **splitted, **dest;
	
	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 = dest = splitted;
	while (*splitted){
		if (**splitted)
			*dest++ = *splitted;
		splitted++;
	}
	*dest = *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_PREFIX doesn't exist or has wrong permissions.", *splitted);

		splitted++;
	}
}

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

	if (strcmp (info->name, aname->name))
		return FALSE;

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

	if ((info->culture != NULL && info->culture [0]) != (aname->culture != NULL && aname->culture [0])) 
		return FALSE;
	
	if (info->culture && aname->culture && strcmp (info->culture, aname->culture))
		return FALSE;
	
	if (!mono_public_tokens_are_equal (info->public_key_token, aname->public_key_token))
		return FALSE;

	return TRUE;
}

static void
mono_assembly_binding_info_free (MonoAssemblyBindingInfo *info)
{
	if (!info)
		return;

	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 (!mono_public_tokens_are_equal (l->public_key_token, r->public_key_token))
		return FALSE;

	return TRUE;
}

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:
 * 
 * Obtains the root directory used for looking up assemblies.
 *
 * Returns: a string with the directory, this string should not be freed.
 */
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 HOST_WIN32

static char *
compute_base (char *path)
{
	char *p = strrchr (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, "/mono-sgen") && strcmp (p, "/pedump") && strcmp (p, "/monodis") && strcmp (p, "/mint") && strcmp (p, "/monodiet"))
		return NULL;
	    
	*p = 0;
	p = strrchr (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 G_GNUC_UNUSED 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/2.0", NULL);
	if (stat (mono, &buf) == -1)
		fallback ();
	else {
		mono_set_dirs (lib, config);
	}
	
	g_free (config);
	g_free (lib);
	g_free (mono);
}

#endif /* HOST_WIN32 */

/**
 * 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)
{
#if defined(HOST_WIN32) || (defined(PLATFORM_MACOSX) && !defined(TARGET_ARM))
	gchar *bindir, *installdir, *root, *name, *resolvedname, *config;

#ifdef HOST_WIN32
	name = mono_get_module_file_name ((HMODULE) &__ImageBase);
#else
 	{
		/* 
		 * _NSGetExecutablePath may return -1 to indicate buf is not large
		 *  enough, but we ignore that case to avoid having to do extra dynamic
		 *  allocation for the path and hope that 4096 is enough - this is 
		 *  ok in the Linux/Solaris case below at least...
		 */
 		
		gchar buf[4096];
 		guint buf_size = sizeof (buf);
 
 		if (_NSGetExecutablePath (buf, &buf_size) == 0)
 			name = g_strdup (buf);
 
 		if (name == NULL) {
 			fallback ();
 			return;
 		}
 	}
#endif

	resolvedname = mono_path_resolve_symlinks (name);

	bindir = g_path_get_dirname (resolvedname);
	installdir = g_path_get_dirname (bindir);
	root = g_build_path (G_DIR_SEPARATOR_S, installdir, "lib", NULL);

	config = g_build_filename (root, "..", "etc", NULL);
#ifdef HOST_WIN32
	mono_set_dirs (root, config);
#else
	if (g_file_test (root, G_FILE_TEST_EXISTS) && g_file_test (config, G_FILE_TEST_EXISTS))
		mono_set_dirs (root, config);
	else
		fallback ();
#endif

	g_free (config);
	g_free (root);
	g_free (installdir);
	g_free (bindir);
	g_free (name);
	g_free (resolvedname);
#elif defined(DISABLE_MONO_AUTODETECTION)
	fallback ();
#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);
}

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]) {
		guchar* token = g_malloc (8);
		gchar* encoded;
		const gchar* pkey;
		int len;

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

		mono_digest_get_public_token (token, aname->public_key, len);
		encoded = encode_public_tok (token, 8);
		g_strlcpy ((char*)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 = (guchar*)mono_metadata_blob_heap (image, cols [MONO_ASSEMBLY_PUBLIC_KEY]);
	}
	else
		aname->public_key = 0;

	return TRUE;
}

/**
 * mono_stringify_assembly_name:
 * @aname: the assembly name.
 *
 * Convert @aname into its string format. The returned string is dynamically
 * allocated and should be freed by the caller.
 *
 * Returns: a newly allocated string with a string representation of
 * the assembly name.
 */
char*
mono_stringify_assembly_name (MonoAssemblyName *aname)
{
	const char *quote = (aname->name && g_ascii_isspace (aname->name [0])) ? "\"" : "";

	return g_strdup_printf (
		"%s%s%s, Version=%d.%d.%d.%d, Culture=%s, PublicKeyToken=%s%s",
		quote, aname->name, quote,
		aname->major, aname->minor, aname->build, aname->revision,
		aname->culture && *aname->culture? aname->culture: "neutral",
		aname->public_key_token [0] ? (char *)aname->public_key_token : "null",
		(aname->flags & ASSEMBLYREF_RETARGETABLE_FLAG) ? ", Retargetable=Yes" : "");
}

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) {
		guchar token [8];
		mono_digest_get_public_token (token, (guchar*)public_tok, len);
		return encode_public_tok (token, 8);
	}

	return encode_public_tok ((guchar*)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);
}

#define SILVERLIGHT_KEY "7cec85d7bea7798e"
#define WINFX_KEY "31bf3856ad364e35"
#define ECMA_KEY "b77a5c561934e089"
#define MSFINAL_KEY "b03f5f7f11d50a3a"

typedef struct {
	const char *name;
	const char *from;
	const char *to;
} KeyRemapEntry;

static KeyRemapEntry key_remap_table[] = {
	{ "Microsoft.CSharp", WINFX_KEY, MSFINAL_KEY },
	{ "System", SILVERLIGHT_KEY, ECMA_KEY },
	{ "System.ComponentModel.Composition", WINFX_KEY, ECMA_KEY },
	{ "System.ComponentModel.DataAnnotations", "ddd0da4d3e678217", WINFX_KEY },
	{ "System.Core", SILVERLIGHT_KEY, ECMA_KEY },
	{ "System.Numerics", WINFX_KEY, ECMA_KEY },
	{ "System.Runtime.Serialization", SILVERLIGHT_KEY, ECMA_KEY },
	{ "System.ServiceModel", WINFX_KEY, ECMA_KEY },
	{ "System.ServiceModel.Web", SILVERLIGHT_KEY, WINFX_KEY },
	{ "System.Windows", SILVERLIGHT_KEY, MSFINAL_KEY },
	{ "System.Xml", SILVERLIGHT_KEY, ECMA_KEY },
	{ "System.Xml.Linq", WINFX_KEY, ECMA_KEY },
	{ "System.Xml.Serialization", WINFX_KEY, MSFINAL_KEY }
};

static void
remap_keys (MonoAssemblyName *aname)
{
	int i;
	for (i = 0; i < G_N_ELEMENTS (key_remap_table); i++) {
		const KeyRemapEntry *entry = &key_remap_table [i];

		if (strcmp (aname->name, entry->name) ||
		    !mono_public_tokens_are_equal (aname->public_key_token, (const unsigned char*) entry->from))
			continue;

		memcpy (aname->public_key_token, entry->to, MONO_PUBLIC_KEY_TOKEN_LENGTH);
		     
		mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_ASSEMBLY,
			    "Remapped public key token of retargetable assembly %s from %s to %s",
			    aname->name, entry->from, entry->to);
		return;
	}
}

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 ();

	if (aname->flags & ASSEMBLYREF_RETARGETABLE_FLAG) {
		const AssemblyVersionSet* vset;

		/* Remap to current runtime */
		vset = &current_runtime->version_sets [0];

		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;
		dest_aname->flags &= ~ASSEMBLYREF_RETARGETABLE_FLAG;

		/* Remap assembly name */
		if (!strcmp (aname->name, "System.Net"))
			dest_aname->name = g_strdup ("System");
		
		remap_keys (dest_aname);

		mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_ASSEMBLY,
					"The request to load the retargetable assembly %s v%d.%d.%d.%d was remapped to %s v%d.%d.%d.%d",
					aname->name,
					aname->major, aname->minor, aname->build, aname->revision,
					dest_aname->name,
					vset->major, vset->minor, vset->build, vset->revision
					);

		return dest_aname;
	}
	
#ifndef DISABLE_ASSEMBLY_REMAPPING
	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;
		}
	}
#endif

	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 ((char*)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 ();
	if (!image->references) {
		MonoTableInfo *t = &image->tables [MONO_TABLE_ASSEMBLYREF];
	
		image->references = g_new0 (MonoAssembly *, t->rows + 1);
	}
	reference = image->references [index];
	mono_assemblies_unlock ();
	if (reference)
		return;

	mono_assembly_get_assemblyref (image, index, &aname);

	if (image->assembly && 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);
			if (!reference)
				/* Try a postload search hook */
				reference = mono_assembly_invoke_search_hook_internal (&aname, TRUE, 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? image->assembly->basedir: NULL, &status);

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

		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 != NULL ? 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");
		} else {
			extra_msg = g_strdup ("");
		}
		
		mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_ASSEMBLY, "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 ((char*)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);
			if (image->assembly)
				mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_ASSEMBLY, "Assembly Ref addref %s[%p] -> %s[%p]: %d",
				    image->assembly->aname.name, image->assembly, reference->aname.name, reference, reference->ref_count);
		} else {
			if (image->assembly)
				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)
{
	/* This is a no-op now but it is part of the embedding API so we can't remove it */
	*status = MONO_IMAGE_OK;
}

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)) {
		part = g_path_get_dirname (filename);
		res = g_strconcat (part, G_DIR_SEPARATOR_S, NULL);
		g_free (part);
		return res;
	}

	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
 */
MonoImage *
mono_assembly_open_from_bundle (const char *filename, MonoImageOpenStatus *status, gboolean refonly)
{
	int i;
	char *name;
	MonoImage *image = NULL;

	/*
	 * we do a very simple search for bundled assemblies: it's not a general 
	 * purpose assembly loading mechanism.
	 */

	if (!bundles)
		return NULL;

	name = g_path_get_basename (filename);

	mono_assemblies_lock ();
	for (i = 0; !image && bundles [i]; ++i) {
		if (strcmp (bundles [i]->name, name) == 0) {
			image = mono_image_open_from_data_with_name ((char*)bundles [i]->data, bundles [i]->size, FALSE, status, refonly, name);
			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;
	gchar *new_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'.", fname);

	new_fname = NULL;
	if (!mono_assembly_is_in_gac (fname))
		new_fname = mono_make_shadow_copy (fname);
	if (new_fname && new_fname != fname) {
		g_free (fname);
		fname = new_fname;
		mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_ASSEMBLY,
			    "Assembly Loader shadow-copied assembly to: '%s'.", fname);
	}
	
	image = NULL;

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

	if (!image)
		image = mono_image_open_full (fname, status, refonly);

	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;
}

static void
free_item (gpointer val, gpointer user_data)
{
	g_free (val);
}

/*
 * mono_assembly_load_friends:
 * @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.
 *
 * This is an internal method, we need this because when we load mscorlib
 * we do not have the mono_defaults.internals_visible_class loaded yet,
 * so we need to load these after we initialize the runtime. 
 *
 * LOCKING: Acquires the assemblies lock plus the loader lock.
 */
void
mono_assembly_load_friends (MonoAssembly* ass)
{
	int i;
	MonoCustomAttrInfo* attrs;
	GSList *list;

	if (ass->friend_assembly_names_inited)
		return;

	attrs = mono_custom_attrs_from_assembly (ass);
	if (!attrs) {
		mono_assemblies_lock ();
		ass->friend_assembly_names_inited = TRUE;
		mono_assemblies_unlock ();
		return;
	}

	mono_assemblies_lock ();
	if (ass->friend_assembly_names_inited) {
		mono_assemblies_unlock ();
		return;
	}
	mono_assemblies_unlock ();

	list = NULL;
	/* 
	 * We build the list outside the assemblies lock, the worse that can happen
	 * is that we'll need to free the allocated list.
	 */
	for (i = 0; i < attrs->num_attrs; ++i) {
		MonoCustomAttrEntry *attr = &attrs->attrs [i];
		MonoAssemblyName *aname;
		const gchar *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 = (const char*)attr->data;
		/* 0xFF means null string, see custom attr format */
		if (data [0] != 1 || data [1] != 0 || (data [2] & 0xFF) == 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, NULL)) {
			list = g_slist_prepend (list, aname);
		} else {
			g_free (aname);
		}
	}
	mono_custom_attrs_free (attrs);

	mono_assemblies_lock ();
	if (ass->friend_assembly_names_inited) {
		mono_assemblies_unlock ();
		g_slist_foreach (list, free_item, NULL);
		g_slist_free (list);
		return;
	}
	ass->friend_assembly_names = list;

	/* Because of the double checked locking pattern above */
	mono_memory_barrier ();
	ass->friend_assembly_names_inited = TRUE;
	mono_assemblies_unlock ();
}

/**
 * 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;

	if (!image->tables [MONO_TABLE_ASSEMBLY].rows) {
		/* 'image' doesn't have a manifest -- maybe someone is trying to Assembly.Load a .netmodule */
		*status = MONO_IMAGE_IMAGE_INVALID;
		return NULL;
	}

#if defined (HOST_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

	/*
	 * 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;

	mono_profiler_assembly_event (ass, MONO_PROFILE_START_LOAD);

	mono_assembly_fill_assembly_name (image, &ass->aname);

	if (mono_defaults.corlib && strcmp (ass->aname.name, "mscorlib") == 0) {
		// MS.NET doesn't support loading other mscorlibs
		g_free (ass);
		g_free (base_dir);
		mono_image_addref (mono_defaults.corlib);
		*status = MONO_IMAGE_OK;
		return mono_defaults.corlib->assembly;
	}

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

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

	/* 
	 * The load hooks might take locks so we can't call them while holding the
	 * assemblies lock.
	 */
	if (ass->aname.name) {
		ass2 = mono_assembly_invoke_search_hook_internal (&ass->aname, refonly, FALSE);
		if (ass2) {
			g_free (ass);
			g_free (base_dir);
			mono_image_close (image);
			*status = MONO_IMAGE_OK;
			return ass2;
		}
	}

	mono_assemblies_lock ();

	if (image->assembly) {
		/* 
		 * This means another thread has already loaded the assembly, but not yet
		 * called the load hooks so the search hook can't find the assembly.
		 */
		mono_assemblies_unlock ();
		ass2 = image->assembly;
		g_free (ass);
		g_free (base_dir);
		mono_image_close (image);
		*status = MONO_IMAGE_OK;
		return ass2;
	}

	image->assembly = ass;

	loaded_assemblies = g_list_prepend (loaded_assemblies, ass);
	mono_assemblies_unlock ();

#ifdef HOST_WIN32
	if (image->is_module_handle)
		mono_image_fixup_vtable (image);
#endif

	mono_assembly_invoke_load_hook (ass);

	mono_profiler_assembly_loaded (ass, MONO_PROFILE_OK);
	
	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, gboolean *is_ecma)
{
	const gchar *pkey;
	gchar header [16], val, *arr;
	gint i, j, offset, bitlen, keylen, pkeylen;
	
	keylen = strlen (key) >> 1;
	if (keylen < 1)
		return FALSE;

	/* allow the ECMA standard key */
	if (strcmp (key, "00000000000000000400000000000000") == 0) {
		if (pubkey) {
			*pubkey = g_strdup (key);
			*is_ecma = TRUE;
		}
		return TRUE;
	}
	*is_ecma = 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;

	/* parsing is OK and the public key itself is not requested back */
	if (!pubkey)
		return TRUE;
		
	/* 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++]);
	}

	*pubkey = arr;

	return TRUE;
}

static gboolean
build_assembly_name (const char *name, const char *version, const char *culture, const char *token, const char *key, guint32 flags, guint32 arch, MonoAssemblyName *aname, gboolean save_public_key)
{
	gint major, minor, build, revision;
	gint len;
	gint version_parts;
	gchar *pkey, *pkeyptr, *encoded, tok [8];

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

	if (version) {
		version_parts = sscanf (version, "%u.%u.%u.%u", &major, &minor, &build, &revision);
		if (version_parts < 2 || version_parts > 4)
			return FALSE;

		/* FIXME: we should set build & revision to -1 (instead of 0)
		if these are not set in the version string. That way, later on,
		we can still determine if these were specified.	*/
		aname->major = major;
		aname->minor = minor;
		if (version_parts >= 3)
			aname->build = build;
		else
			aname->build = 0;
		if (version_parts == 4)
			aname->revision = revision;
		else
			aname->revision = 0;
	}
	
	aname->flags = flags;
	aname->arch = arch;
	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;

		/* the constant includes the ending NULL, hence the -1 */
		if (strlen (token) != (MONO_PUBLIC_KEY_TOKEN_LENGTH - 1)) {
			mono_assembly_name_free (aname);
			return FALSE;
		}
		lower …