/* Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

-- Copyright (C) 1994-2015 Lua.org, PUC-Rio.

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

*/

/*

* encodings.c

* Lua library for base64, stringprep and idna encodings

*/

/* Newer MSVC compilers deprecate strcpy as unsafe, but we use it in a safe way */

#define _CRT_SECURE_NO_DEPRECATE

#include <string.h>

#include <stdlib.h>

#include "lua.h"

#include "lauxlib.h"

#if (LUA_VERSION_NUM == 502)

#define luaL_register(L, N, R) luaL_setfuncs(L, R, 0)

#endif

/***************** BASE64 *****************/

	int i;

	char s[4];

		tuple /= 64;

	}

}

	size_t l;

	luaL_Buffer b;

	int n;

	}

	luaL_pushresult(&b);

	return 1;

}

	char s[3];

	}

}

	size_t l;

	luaL_Buffer b;

	char t[4];

			default:

				}

				break;

			case '=':

				}

				break;

			case 0:

				luaL_pushresult(&b);

				return 1;

				break;

		}

	}

}

	{ "encode",	Lbase64_encode	},

	{ "decode",	Lbase64_decode	},

	{ NULL,		NULL	}

};

/******************* UTF-8 ********************/

/*

 * Adapted from Lua 5.3

 * Needed because libidn does not validate that input is valid UTF-8

 */

#define MAXUNICODE	0x10FFFF

/*

 * Decode one UTF-8 sequence, returning NULL if byte sequence is invalid.

 */

	static unsigned int limits[] = {0xFF, 0x7F, 0x7FF, 0xFFFF};

	unsigned int c = s[0];

	unsigned int res = 0;  /* final result */

		res = c;

		int count = 0;  /* to count number of continuation bytes */

			int cc = s[++count];  /* read next byte */

			res = (res << 6) | (cc & 0x3F);  /* add lower 6 bits from cont. byte */

			c <<= 1;  /* to test next bit */

		}

		res |= ((c & 0x7F) << (count * 5));  /* add first byte */

		s += count;  /* skip continuation bytes read */

	}

}

/*

 * Check that a string is valid UTF-8

 * Returns NULL if not

 */

	size_t pos, len;

	pos = 0;

			return NULL;

		}

		pos = s1 - s;

	}

	if(l != NULL) {

		*l = len;

	}

	return s;

}

	lua_pushboolean(L, check_utf8(L, 1, NULL) != NULL);

	return 1;

}

	size_t len;

	if(!check_utf8(L, 1, &len)) {

		lua_pushnil(L);

		lua_pushliteral(L, "invalid utf8");

		return 2;

	}

	lua_pushinteger(L, len);

	return 1;

}

	{ "valid",	Lutf8_valid	},

	{ "length",	Lutf8_length	},

	{ NULL,		NULL	}

};

/***************** STRINGPREP *****************/

#ifdef USE_STRINGPREP_ICU

#include <unicode/usprep.h>

#include <unicode/ustring.h>

#include <unicode/utrace.h>

	size_t input_len;

	int32_t unprepped_len, prepped_len, output_len;

	char output[1024];

	UChar unprepped[1024]; /* Temporary unicode buffer (1024 characters) */

	UChar prepped[1024];

	UErrorCode err = U_ZERO_ERROR;

	if(!lua_isstring(L, 1)) {

		lua_pushnil(L);

		return 1;

	}

	input = lua_tolstring(L, 1, &input_len);

		lua_pushnil(L);

		return 1;

	}

	u_strFromUTF8(unprepped, 1024, &unprepped_len, input, input_len, &err);

		lua_pushnil(L);

		return 1;

	}

	prepped_len = usprep_prepare(profile, unprepped, unprepped_len, prepped, 1024, 0, NULL, &err);

		lua_pushnil(L);

		return 1;

	} else {

		u_strToUTF8(output, 1024, &output_len, prepped, prepped_len, &err);

			lua_pushlstring(L, output, output_len);

			lua_pushnil(L);

		return 1;

	}

}

/* initialize global ICU stringprep profiles */

	UErrorCode err = U_ZERO_ERROR;

	utrace_setLevel(UTRACE_VERBOSE);

	icu_nameprep = usprep_openByType(USPREP_RFC3491_NAMEPREP, &err);

	icu_nodeprep = usprep_openByType(USPREP_RFC3920_NODEPREP, &err);

	icu_resourceprep = usprep_openByType(USPREP_RFC3920_RESOURCEPREP, &err);

	icu_saslprep = usprep_openByType(USPREP_RFC4013_SASLPREP, &err);

}

#define MAKE_PREP_FUNC(myFunc, prep) \

static int myFunc(lua_State *L) { return icu_stringprep_prep(L, prep); }

MAKE_PREP_FUNC(Lstringprep_nameprep, icu_nameprep)		/** stringprep.nameprep(s) */

MAKE_PREP_FUNC(Lstringprep_nodeprep, icu_nodeprep)		/** stringprep.nodeprep(s) */

MAKE_PREP_FUNC(Lstringprep_resourceprep, icu_resourceprep)		/** stringprep.resourceprep(s) */

MAKE_PREP_FUNC(Lstringprep_saslprep, icu_saslprep)		/** stringprep.saslprep(s) */

	{ "nameprep",	Lstringprep_nameprep	},

	{ "nodeprep",	Lstringprep_nodeprep	},

	{ "resourceprep",	Lstringprep_resourceprep	},

	{ "saslprep",	Lstringprep_saslprep	},

	{ NULL,		NULL	}

};

#else /* USE_STRINGPREP_ICU */

/****************** libidn ********************/

#include <stringprep.h>

	size_t len;

	char string[1024];

	int ret;

	if(!lua_isstring(L, 1)) {

		lua_pushnil(L);

		return 1;

	}

	s = check_utf8(L, 1, &len);

		lua_pushnil(L);

		return 1; /* TODO return error message */

	}

	strcpy(string, s);

	ret = stringprep(string, 1024, (Stringprep_profile_flags)0, profile);

		lua_pushstring(L, string);

		return 1;

	} else {

		lua_pushnil(L);

		return 1; /* TODO return error message */

	}

}

#define MAKE_PREP_FUNC(myFunc, prep) \

static int myFunc(lua_State *L) { return stringprep_prep(L, prep); }

MAKE_PREP_FUNC(Lstringprep_nameprep, stringprep_nameprep)		/** stringprep.nameprep(s) */