[apple/xnu.git] / bsd / hfs / hfs_encodings.c

/*
 * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
#if HFS

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/utfconv.h>
#include <kern/host.h>
#include <mach/host_priv.h>

#include "hfs.h"


lck_grp_t * encodinglst_lck_grp;
lck_grp_attr_t * encodinglst_lck_grp_attr;
lck_attr_t * encodinglst_lck_attr;


/* hfs encoding converter list */
SLIST_HEAD(encodinglst, hfs_encoding) hfs_encoding_list = {0};

lck_mtx_t  encodinglst_mutex;


/* hfs encoding converter entry */
struct	hfs_encoding {
	SLIST_ENTRY(hfs_encoding)  link;
	int			refcount;
	int			kmod_id;
	u_int32_t	encoding;
	hfs_to_unicode_func_t	get_unicode_func;
	unicode_to_hfs_func_t	get_hfsname_func;
};

#define MAX_HFS_UNICODE_CHARS	(15*5)

static int unicode_to_mac_roman(UniChar *uni_str, u_int32_t unicodeChars, Str31 hfs_str);

void
hfs_converterinit(void)
{
	SLIST_INIT(&hfs_encoding_list);

	encodinglst_lck_grp_attr= lck_grp_attr_alloc_init();
	encodinglst_lck_grp  = lck_grp_alloc_init("cnode_hash", encodinglst_lck_grp_attr);
	encodinglst_lck_attr = lck_attr_alloc_init();

	lck_mtx_init(&encodinglst_mutex, encodinglst_lck_grp, encodinglst_lck_attr);

	/*
	 * add resident MacRoman converter and take a reference
	 * since its always "loaded".
	 */
	hfs_addconverter(0, kTextEncodingMacRoman, mac_roman_to_unicode, unicode_to_mac_roman);
	SLIST_FIRST(&hfs_encoding_list)->refcount++;
}


/*
 * hfs_addconverter - add an HFS encoding converter
 *
 * This is called exclusivly by kernel loadable modules
 * (like HFS_Japanese.kmod) to register hfs encoding
 * conversion routines.
 *
 */
int
hfs_addconverter(int id, u_int32_t encoding, hfs_to_unicode_func_t get_unicode, unicode_to_hfs_func_t get_hfsname)
{
	struct hfs_encoding *encp;
	
	MALLOC(encp, struct hfs_encoding *, sizeof(struct hfs_encoding), M_TEMP, M_WAITOK);

	lck_mtx_lock(&encodinglst_mutex);

	encp->link.sle_next = NULL;
	encp->refcount = 0;
	encp->encoding = encoding;
	encp->get_unicode_func = get_unicode;
	encp->get_hfsname_func = get_hfsname;
	encp->kmod_id = id;
	SLIST_INSERT_HEAD(&hfs_encoding_list, encp, link);

	lck_mtx_unlock(&encodinglst_mutex);
	return (0);
}


/*
 * hfs_remconverter - remove an HFS encoding converter
 *
 * Can be called by a kernel loadable module's finalize
 * routine to remove an encoding converter so that the
 * module (i.e. the code) can be unloaded.
 *
 * However, in the normal case, the removing and unloading
 * of these converters is done in hfs_relconverter.
 * The call is initiated from within the kernel during the unmounting of an hfs voulume.
 */
int
hfs_remconverter(int id, u_int32_t encoding)
{
	struct hfs_encoding *encp;

	lck_mtx_lock(&encodinglst_mutex);
	SLIST_FOREACH(encp, &hfs_encoding_list, link) {
		if (encp->encoding == encoding && encp->kmod_id == id) {
			encp->refcount--;
			
			/* if converter is no longer in use, release it */
			if (encp->refcount <= 0 && encp->kmod_id != 0) {
				SLIST_REMOVE(&hfs_encoding_list, encp, hfs_encoding, link);
				lck_mtx_unlock(&encodinglst_mutex);
    				FREE(encp, M_TEMP);
    				return (0);
 			} else {
 				lck_mtx_unlock(&encodinglst_mutex);
				return (1);   /* busy */
			}
			break;
		}
	}
	lck_mtx_unlock(&encodinglst_mutex);

	return (0);
}


/*
 * hfs_getconverter - get HFS encoding converters
 *
 * Normally called during the mounting of an hfs voulume.
 */
int
hfs_getconverter(u_int32_t encoding, hfs_to_unicode_func_t *get_unicode, unicode_to_hfs_func_t *get_hfsname)
{
	struct hfs_encoding *encp;
	int found = 0;

	lck_mtx_lock(&encodinglst_mutex);
	SLIST_FOREACH(encp, &hfs_encoding_list, link) {
		if (encp->encoding == encoding) {
			found = 1;
			*get_unicode = encp->get_unicode_func;
			*get_hfsname = encp->get_hfsname_func;
			++encp->refcount;
			break;
		}
	}
	lck_mtx_unlock(&encodinglst_mutex);

	if (!found) {
		*get_unicode = NULL;
		*get_hfsname = NULL;
		return (EINVAL);
	}
	
	return (0);
}


/*
 * hfs_relconverter - release interest in an HFS encoding converter
 *
 * Normally called during the unmounting of an hfs voulume.
 */
int
hfs_relconverter(u_int32_t encoding)
{
	struct hfs_encoding *encp;

	lck_mtx_lock(&encodinglst_mutex);
	SLIST_FOREACH(encp, &hfs_encoding_list, link) {
		if (encp->encoding == encoding) {
			encp->refcount--;
			
			/* if converter is no longer in use, release it */
			if (encp->refcount <= 0 && encp->kmod_id != 0) {
				int id = encp->kmod_id;

				SLIST_REMOVE(&hfs_encoding_list, encp, hfs_encoding, link);
				lck_mtx_unlock(&encodinglst_mutex);
 
 				FREE(encp, M_TEMP);
                record_kext_unload(id);
   				kmod_destroy((host_priv_t) host_priv_self(), id);
				return (0);
			}
			lck_mtx_unlock(&encodinglst_mutex);
			return (0);
		}
	}
	lck_mtx_unlock(&encodinglst_mutex);

	return (EINVAL);
}


/*
 * Convert HFS encoded string into UTF-8
 *
 * Unicode output is fully decomposed
 * '/' chars are converted to ':'
 */
int
hfs_to_utf8(ExtendedVCB *vcb, const Str31 hfs_str, ByteCount maxDstLen, ByteCount *actualDstLen, unsigned char* dstStr)
{
	int error;
	UniChar uniStr[MAX_HFS_UNICODE_CHARS];
	ItemCount uniCount;
	size_t utf8len;
	hfs_to_unicode_func_t hfs_get_unicode = VCBTOHFS(vcb)->hfs_get_unicode;

	error = hfs_get_unicode(hfs_str, uniStr, MAX_HFS_UNICODE_CHARS, &uniCount);
	
	if (uniCount == 0)
		error = EINVAL;

	if (error == 0) {
		error = utf8_encodestr(uniStr, uniCount * sizeof(UniChar), dstStr, &utf8len, maxDstLen , ':', 0);
		if (error == ENAMETOOLONG)
			*actualDstLen = utf8_encodelen(uniStr, uniCount * sizeof(UniChar), ':', 0);
		else
			*actualDstLen = utf8len;
	}

	return error;
}


/*
 * When an HFS name cannot be encoded with the current
 * volume encoding then MacRoman is used as a fallback.
 */
int
mac_roman_to_utf8(const Str31 hfs_str, ByteCount maxDstLen, ByteCount *actualDstLen, unsigned char* dstStr)
{
	int error;
	UniChar uniStr[MAX_HFS_UNICODE_CHARS];
	ItemCount uniCount;
	size_t utf8len;

	error = mac_roman_to_unicode(hfs_str, uniStr, MAX_HFS_UNICODE_CHARS, &uniCount);
	
	if (uniCount == 0)
		error = EINVAL;

	if (error == 0) {
		error = utf8_encodestr(uniStr, uniCount * sizeof(UniChar), dstStr, &utf8len, maxDstLen , ':', 0);
		if (error == ENAMETOOLONG)
			*actualDstLen = utf8_encodelen(uniStr, uniCount * sizeof(UniChar), ':', 0);
		else
			*actualDstLen = utf8len;
	}

	return error;
}


/*
 * Convert Unicode string into HFS encoding
 *
 * ':' chars are converted to '/'
 * Assumes input represents fully decomposed Unicode
 */
int
unicode_to_hfs(ExtendedVCB *vcb, ByteCount srcLen, u_int16_t* srcStr, Str31 dstStr, int retry)
{
	int error;
	unicode_to_hfs_func_t hfs_get_hfsname = VCBTOHFS(vcb)->hfs_get_hfsname;

	error = hfs_get_hfsname(srcStr, srcLen/sizeof(UniChar), dstStr);
	if (error && retry) {
		error = unicode_to_mac_roman(srcStr, srcLen/sizeof(UniChar), dstStr);
	}
	return error;
}

/*
 * Convert UTF-8 string into HFS encoding
 *
 * ':' chars are converted to '/'
 * Assumes input represents fully decomposed Unicode
 */
int
utf8_to_hfs(ExtendedVCB *vcb, ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr/*, int retry*/)
{
	int error;
	UniChar uniStr[MAX_HFS_UNICODE_CHARS];
	size_t ucslen;

	error = utf8_decodestr(srcStr, srcLen, uniStr, &ucslen, sizeof(uniStr), ':', 0);
	if (error == 0)
		error = unicode_to_hfs(vcb, ucslen, uniStr, dstStr, 1);

	return error;
}

int
utf8_to_mac_roman(ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr)
{
	int error;
	UniChar uniStr[MAX_HFS_UNICODE_CHARS];
	size_t ucslen;

	error = utf8_decodestr(srcStr, srcLen, uniStr, &ucslen, sizeof(uniStr), ':', 0);
	if (error == 0)
		error = unicode_to_mac_roman(uniStr, ucslen/sizeof(UniChar), dstStr);

	return error;
}

/*
 * HFS MacRoman to/from Unicode conversions are built into the kernel
 * All others hfs encodings are loadable.
 */

/* 0x00A0 - 0x00FF = Latin 1 Supplement (30 total) */
static u_int8_t gLatin1Table[] = {
  /*		  0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
  /* 0x00A0 */	0xCA, 0xC1, 0xA2, 0xA3, 0xDB, 0xB4,  '?', 0xA4, 0xAC, 0xA9, 0xBB, 0xC7, 0xC2,  '?', 0xA8, 0xF8,
  /* 0x00B0 */	0xA1, 0XB1,  '?',  '?', 0xAB, 0xB5, 0xA6, 0xe1, 0xFC,  '?', 0xBC, 0xC8,  '?',  '?',  '?', 0xC0,
  /* 0x00C0 */	 '?',  '?',  '?',  '?',  '?',  '?', 0xAE,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x00D0 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xAF,  '?',  '?',  '?',  '?',  '?',  '?', 0xA7,
  /* 0x00E0 */	 '?',  '?',  '?',  '?',  '?',  '?', 0xBE,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x00F0 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xD6, 0xBF,  '?',  '?',  '?',  '?',  '?',  '?',  '?'
};

/* 0x02C0 - 0x02DF = Spacing Modifiers (8 total) */
static u_int8_t gSpaceModsTable[] = {
  /*		  0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
  /* 0x02C0 */	 '?',  '?',  '?',  '?',  '?',  '?', 0xF6, 0xFF,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x02D0 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xF9, 0xFA, 0xFB, 0xFE, 0xF7, 0xFD,  '?',  '?'
};

/* 0x2010 - 0x20AF = General Punctuation (17 total) */
static u_int8_t gPunctTable[] = {
  /*		  0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
  /* 0x2010 */	 '?',  '?',  '?', 0xd0, 0xd1,  '?',  '?',  '?', 0xd4, 0xd5, 0xe2,  '?', 0xd2, 0xd3, 0xe3,  '?',
  /* 0x2020 */	0xa0, 0xe0, 0xa5,  '?',  '?',  '?', 0xc9,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x2030 */	0xe4,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xdc, 0xdd,  '?',  '?',  '?',  '?',  '?',
  /* 0x2040 */	 '?',  '?',  '?',  '?', 0xda,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x2050 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x2060 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x2070 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x2080 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x2090 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x20A0 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xdb,  '?',  '?',  '?'
};

/* 0x22xx = Mathematical Operators (11 total) */
static u_int8_t gMathTable[] = {
  /*		  0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
  /* 0x2200 */	 '?',  '?', 0xb6,  '?',  '?',  '?', 0xc6,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xb8,
  /* 0x2210 */	 '?', 0xb7,  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xc3,  '?',  '?',  '?', 0xb0,  '?',
  /* 0x2220 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xba,  '?',  '?',  '?',  '?',
  /* 0x2230 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x2240 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xc5,  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x2250 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',
  /* 0x2260 */	0xad,  '?',  '?',  '?', 0xb2, 0xb3,  '?',  '?'
};

/* */
static u_int8_t gReverseCombTable[] = {
  /*		  0     1     2     3     4     5     6     7     8     9     A     B     C     D     E     F  */
  /* 0x40 */	0xDA, 0x40, 0xDA, 0xDA, 0xDA, 0x56, 0xDA, 0xDA, 0xDA, 0x6C, 0xDA, 0xDA, 0xDA, 0xDA, 0x82, 0x98,
  /* 0x50 */	0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xAE, 0xDA, 0xDA, 0xDA, 0xC4, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA,
  /* 0x60 */	0xDA, 0x4B, 0xDA, 0xDA, 0xDA, 0x61, 0xDA, 0xDA, 0xDA, 0x77, 0xDA, 0xDA, 0xDA, 0xDA, 0x8D, 0xA3,
  /* 0x70 */	0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xB9, 0xDA, 0xDA, 0xDA, 0xCF, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA,

  /* Combining Diacritical Marks (0x0300 - 0x030A) */
  /*              0     1     2     3     4     5     6     7     8     9     A  */
  /*  'A'   */
  /* 0x0300 */	0xCB, 0xE7, 0xE5, 0xCC,  '?',  '?',  '?',  '?', 0x80,  '?', 0x81,

  /*  'a'   */
  /* 0x0300 */	0x88, 0x87, 0x89, 0x8B,  '?',  '?',  '?',  '?', 0x8A,  '?', 0x8C,

  /*  'E'   */
  /* 0x0300 */	0xE9, 0x83, 0xE6,  '?',  '?',  '?',  '?',  '?', 0xE8,  '?',  '?',

  /*  'e'   */
  /* 0x0300 */	0x8F, 0x8E, 0x90,  '?',  '?',  '?',  '?',  '?', 0x91,  '?',  '?',

  /*  'I'   */
  /* 0x0300 */	0xED, 0xEA, 0xEB,  '?',  '?',  '?',  '?',  '?', 0xEC,  '?',  '?',

  /*  'i'   */
  /* 0x0300 */	0x93, 0x92, 0x94,  '?',  '?',  '?',  '?',  '?', 0x95,  '?',  '?',

  /*  'N'   */
  /* 0x0300 */	 '?',  '?',  '?', 0x84,  '?',  '?',  '?',  '?',  '?',  '?',  '?',

  /*  'n'   */
  /* 0x0300 */	 '?',  '?',  '?', 0x96,  '?',  '?',  '?',  '?',  '?',  '?',  '?',

  /*  'O'   */
  /* 0x0300 */	0xF1, 0xEE, 0xEF, 0xCD,  '?',  '?',  '?',  '?', 0x85,  '?',  '?',

  /*  'o'   */
  /* 0x0300 */	0x98, 0x97, 0x99, 0x9B,  '?',  '?',  '?',  '?', 0x9A,  '?',  '?',

  /*  'U'   */
  /* 0x0300 */	0xF4, 0xF2, 0xF3,  '?',  '?',  '?',  '?',  '?', 0x86,  '?',  '?',

  /*  'u'   */
  /* 0x0300 */	0x9D, 0x9C, 0x9E,  '?',  '?',  '?',  '?',  '?', 0x9F,  '?',  '?',

  /*  'Y'   */
  /* 0x0300 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xD9,  '?',  '?',

  /*  'y'   */
  /* 0x0300 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?', 0xD8,  '?',  '?',

  /*  else  */
  /* 0x0300 */	 '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?',  '?'
};


/*
 * Convert Unicode string into HFS MacRoman encoding
 *
 * Assumes Unicode input is fully decomposed
 */
static int unicode_to_mac_roman(UniChar *uni_str, u_int32_t unicodeChars, Str31 hfs_str)
{
	u_int8_t	*p;
	const UniChar	*u;
	UniChar		c;
	UniChar		mask;
	u_int16_t	inputChars;
	u_int16_t	pascalChars;
	OSErr		result = noErr;
	u_int8_t	lsb;
	u_int8_t	prevChar;
	u_int8_t	mc;

	mask = (UniChar) 0xFF80;
	p = &hfs_str[1];
	u = uni_str;
	inputChars = unicodeChars;
	pascalChars = prevChar = 0;
	
	while (inputChars) {
		c = *(u++);
		lsb = (u_int8_t) c;

		/*
		 * If its not 7-bit ascii, then we need to map it
		 */
		if ( c & mask ) {
			mc = '?';
			switch (c & 0xFF00) {
			case 0x0000:
				if (lsb >= 0xA0)
					mc = gLatin1Table[lsb - 0xA0];
				break;

			case 0x0200:
				if (lsb >= 0xC0 && lsb <= 0xDF)
					mc = gSpaceModsTable[lsb - 0xC0];
				break;

			case 0x2000:
				if (lsb >= 0x10 && lsb <= 0xAF)
					mc = gPunctTable[lsb- 0x10];
				break;

			case 0x2200:
				if (lsb <= 0x68)
					mc = gMathTable[lsb];
				break;

			case 0x0300:
				if (c <= 0x030A) {
					if (prevChar >= 'A' && prevChar < 'z') {
						mc = gReverseCombTable[gReverseCombTable[prevChar - 0x40] + lsb];
						--p;	/* backup over base char */
						--pascalChars;
					}
				} else {
					switch (c) {
					case 0x0327:	/* combining cedilla */
						if (prevChar == 'C')
							mc = 0x82;
						else if (prevChar == 'c')
							mc = 0x8D;
						else
							break;
						--p;	/* backup over base char */
						--pascalChars;
						break;

					case 0x03A9: mc = 0xBD; break;	/* omega */

					case 0x03C0: mc = 0xB9; break;	/* pi */
					}
				}
				break;
				
			default:
				switch (c) {
				case 0x0131: mc = 0xf5; break;	/* dotless i */

				case 0x0152: mc = 0xce; break;	/* OE */

				case 0x0153: mc = 0xcf; break;	/* oe */
Commit	Line	Data
1c79356b	1	/*
2d21ac55	2	* Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved.
5d5c5d0d	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b	27	*/
2d21ac55	28	#if HFS
1c79356b A	29
	30	#include <sys/param.h>
	31	#include <sys/systm.h>
	32	#include <sys/kernel.h>
1c79356b A	33	#include <sys/malloc.h>
	34	#include <sys/queue.h>
	35	#include <sys/utfconv.h>
2d21ac55 A	36	#include <kern/host.h>
2d21ac55 A	37	#include <mach/host_priv.h>
1c79356b A	38
	39	#include "hfs.h"
	40
	41
91447636 A	42	lck_grp_t * encodinglst_lck_grp;
	43	lck_grp_attr_t * encodinglst_lck_grp_attr;
	44	lck_attr_t * encodinglst_lck_attr;
	45
	46
1c79356b A	47	/* hfs encoding converter list */
1c79356b A	48	SLIST_HEAD(encodinglst, hfs_encoding) hfs_encoding_list = {0};
91447636 A	49
	50	lck_mtx_t encodinglst_mutex;
	51
1c79356b A	52
	53
	54	/* hfs encoding converter entry */
	55	struct hfs_encoding {
	56	SLIST_ENTRY(hfs_encoding) link;
	57	int refcount;
	58	int kmod_id;
2d21ac55	59	u_int32_t encoding;
1c79356b A	60	hfs_to_unicode_func_t get_unicode_func;
	61	unicode_to_hfs_func_t get_hfsname_func;
	62	};
	63
1c79356b A	64	#define MAX_HFS_UNICODE_CHARS (15*5)
1c79356b A	65
2d21ac55	66	static int unicode_to_mac_roman(UniChar *uni_str, u_int32_t unicodeChars, Str31 hfs_str);
1c79356b A	67
	68	void
	69	hfs_converterinit(void)
	70	{
	71	SLIST_INIT(&hfs_encoding_list);
91447636 A	72
91447636 A	73	encodinglst_lck_grp_attr= lck_grp_attr_alloc_init();
91447636	74	encodinglst_lck_grp = lck_grp_alloc_init("cnode_hash", encodinglst_lck_grp_attr);
91447636	75	encodinglst_lck_attr = lck_attr_alloc_init();
91447636 A	76
91447636 A	77	lck_mtx_init(&encodinglst_mutex, encodinglst_lck_grp, encodinglst_lck_attr);
1c79356b A	78
	79	/*
	80	* add resident MacRoman converter and take a reference
	81	* since its always "loaded".
	82	*/
	83	hfs_addconverter(0, kTextEncodingMacRoman, mac_roman_to_unicode, unicode_to_mac_roman);
	84	SLIST_FIRST(&hfs_encoding_list)->refcount++;
	85	}
	86
	87
	88	/*
	89	* hfs_addconverter - add an HFS encoding converter
	90	*
	91	* This is called exclusivly by kernel loadable modules
	92	* (like HFS_Japanese.kmod) to register hfs encoding
	93	* conversion routines.
	94	*
	95	*/
	96	int
2d21ac55	97	hfs_addconverter(int id, u_int32_t encoding, hfs_to_unicode_func_t get_unicode, unicode_to_hfs_func_t get_hfsname)
1c79356b A	98	{
	99	struct hfs_encoding *encp;
	100
	101	MALLOC(encp, struct hfs_encoding *, sizeof(struct hfs_encoding), M_TEMP, M_WAITOK);
	102
91447636	103	lck_mtx_lock(&encodinglst_mutex);
1c79356b A	104
	105	encp->link.sle_next = NULL;
	106	encp->refcount = 0;
	107	encp->encoding = encoding;
	108	encp->get_unicode_func = get_unicode;
	109	encp->get_hfsname_func = get_hfsname;
	110	encp->kmod_id = id;
	111	SLIST_INSERT_HEAD(&hfs_encoding_list, encp, link);
	112
91447636	113	lck_mtx_unlock(&encodinglst_mutex);
1c79356b A	114	return (0);
	115	}
	116
	117
	118	/*
	119	* hfs_remconverter - remove an HFS encoding converter
	120	*
	121	* Can be called by a kernel loadable module's finalize
	122	* routine to remove an encoding converter so that the
	123	* module (i.e. the code) can be unloaded.
	124	*
	125	* However, in the normal case, the removing and unloading
	126	* of these converters is done in hfs_relconverter.
	127	* The call is initiated from within the kernel during the unmounting of an hfs voulume.
	128	*/
	129	int
2d21ac55	130	hfs_remconverter(int id, u_int32_t encoding)
1c79356b A	131	{
1c79356b A	132	struct hfs_encoding *encp;
1c79356b	133
91447636	134	lck_mtx_lock(&encodinglst_mutex);
1c79356b A	135	SLIST_FOREACH(encp, &hfs_encoding_list, link) {
	136	if (encp->encoding == encoding && encp->kmod_id == id) {
	137	encp->refcount--;
	138
	139	/* if converter is no longer in use, release it */
	140	if (encp->refcount <= 0 && encp->kmod_id != 0) {
	141	SLIST_REMOVE(&hfs_encoding_list, encp, hfs_encoding, link);
91447636	142	lck_mtx_unlock(&encodinglst_mutex);
1c79356b	143	FREE(encp, M_TEMP);
91447636	144	return (0);
1c79356b	145	} else {
91447636 A	146	lck_mtx_unlock(&encodinglst_mutex);
91447636 A	147	return (1); /* busy */
1c79356b A	148	}
	149	break;
	150	}
	151	}
91447636	152	lck_mtx_unlock(&encodinglst_mutex);
1c79356b	153
91447636	154	return (0);
1c79356b A	155	}
	156
	157
	158	/*
	159	* hfs_getconverter - get HFS encoding converters
	160	*
	161	* Normally called during the mounting of an hfs voulume.
	162	*/
	163	int
2d21ac55	164	hfs_getconverter(u_int32_t encoding, hfs_to_unicode_func_t get_unicode, unicode_to_hfs_func_t get_hfsname)
1c79356b A	165	{
	166	struct hfs_encoding *encp;
	167	int found = 0;
	168
91447636	169	lck_mtx_lock(&encodinglst_mutex);
1c79356b A	170	SLIST_FOREACH(encp, &hfs_encoding_list, link) {
	171	if (encp->encoding == encoding) {
	172	found = 1;
	173	*get_unicode = encp->get_unicode_func;
	174	*get_hfsname = encp->get_hfsname_func;
	175	++encp->refcount;
	176	break;
	177	}
	178	}
91447636	179	lck_mtx_unlock(&encodinglst_mutex);
1c79356b A	180
	181	if (!found) {
	182	*get_unicode = NULL;
	183	*get_hfsname = NULL;
	184	return (EINVAL);
	185	}
	186
	187	return (0);
	188	}
	189
	190
	191	/*
	192	* hfs_relconverter - release interest in an HFS encoding converter
	193	*
	194	* Normally called during the unmounting of an hfs voulume.
	195	*/
	196	int
2d21ac55	197	hfs_relconverter(u_int32_t encoding)
1c79356b A	198	{
1c79356b A	199	struct hfs_encoding *encp;
1c79356b	200
91447636	201	lck_mtx_lock(&encodinglst_mutex);
1c79356b A	202	SLIST_FOREACH(encp, &hfs_encoding_list, link) {
1c79356b A	203	if (encp->encoding == encoding) {
1c79356b A	204	encp->refcount--;
	205
	206	/* if converter is no longer in use, release it */
	207	if (encp->refcount <= 0 && encp->kmod_id != 0) {
	208	int id = encp->kmod_id;
	209
	210	SLIST_REMOVE(&hfs_encoding_list, encp, hfs_encoding, link);
91447636 A	211	lck_mtx_unlock(&encodinglst_mutex);
	212
	213	FREE(encp, M_TEMP);
c910b4d9	214	record_kext_unload(id);
91447636 A	215	kmod_destroy((host_priv_t) host_priv_self(), id);
91447636 A	216	return (0);
1c79356b	217	}
91447636 A	218	lck_mtx_unlock(&encodinglst_mutex);
91447636 A	219	return (0);
1c79356b A	220	}
1c79356b A	221	}
91447636	222	lck_mtx_unlock(&encodinglst_mutex);
1c79356b	223
91447636	224	return (EINVAL);
1c79356b A	225	}
	226
	227
	228	/*
	229	* Convert HFS encoded string into UTF-8
	230	*
	231	* Unicode output is fully decomposed
	232	* '/' chars are converted to ':'
	233	*/
	234	int
2d21ac55	235	hfs_to_utf8(ExtendedVCB vcb, const Str31 hfs_str, ByteCount maxDstLen, ByteCount actualDstLen, unsigned char* dstStr)
1c79356b A	236	{
	237	int error;
	238	UniChar uniStr[MAX_HFS_UNICODE_CHARS];
	239	ItemCount uniCount;
	240	size_t utf8len;
	241	hfs_to_unicode_func_t hfs_get_unicode = VCBTOHFS(vcb)->hfs_get_unicode;
	242
	243	error = hfs_get_unicode(hfs_str, uniStr, MAX_HFS_UNICODE_CHARS, &uniCount);
	244
	245	if (uniCount == 0)
	246	error = EINVAL;
	247
	248	if (error == 0) {
	249	error = utf8_encodestr(uniStr, uniCount * sizeof(UniChar), dstStr, &utf8len, maxDstLen , ':', 0);
	250	if (error == ENAMETOOLONG)
	251	actualDstLen = utf8_encodelen(uniStr, uniCount sizeof(UniChar), ':', 0);
	252	else
	253	*actualDstLen = utf8len;
	254	}
	255
	256	return error;
	257	}
	258
	259
	260	/*
	261	* When an HFS name cannot be encoded with the current
	262	* volume encoding then MacRoman is used as a fallback.
	263	*/
	264	int
2d21ac55	265	mac_roman_to_utf8(const Str31 hfs_str, ByteCount maxDstLen, ByteCount actualDstLen, unsigned char dstStr)
1c79356b A	266	{
	267	int error;
	268	UniChar uniStr[MAX_HFS_UNICODE_CHARS];
	269	ItemCount uniCount;
	270	size_t utf8len;
	271
	272	error = mac_roman_to_unicode(hfs_str, uniStr, MAX_HFS_UNICODE_CHARS, &uniCount);
	273
	274	if (uniCount == 0)
	275	error = EINVAL;
	276
	277	if (error == 0) {
	278	error = utf8_encodestr(uniStr, uniCount * sizeof(UniChar), dstStr, &utf8len, maxDstLen , ':', 0);
	279	if (error == ENAMETOOLONG)
	280	actualDstLen = utf8_encodelen(uniStr, uniCount sizeof(UniChar), ':', 0);
	281	else
	282	*actualDstLen = utf8len;
	283	}
	284
	285	return error;
	286	}
	287
	288
9bccf70c A	289	/*
	290	* Convert Unicode string into HFS encoding
	291	*
	292	* ':' chars are converted to '/'
	293	* Assumes input represents fully decomposed Unicode
	294	*/
	295	int
	296	unicode_to_hfs(ExtendedVCB vcb, ByteCount srcLen, u_int16_t srcStr, Str31 dstStr, int retry)
	297	{
	298	int error;
	299	unicode_to_hfs_func_t hfs_get_hfsname = VCBTOHFS(vcb)->hfs_get_hfsname;
	300
	301	error = hfs_get_hfsname(srcStr, srcLen/sizeof(UniChar), dstStr);
	302	if (error && retry) {
	303	error = unicode_to_mac_roman(srcStr, srcLen/sizeof(UniChar), dstStr);
	304	}
	305	return error;
	306	}
	307
1c79356b A	308	/*
	309	* Convert UTF-8 string into HFS encoding
	310	*
	311	* ':' chars are converted to '/'
	312	* Assumes input represents fully decomposed Unicode
	313	*/
	314	int
9bccf70c	315	utf8_to_hfs(ExtendedVCB vcb, ByteCount srcLen, const unsigned char srcStr, Str31 dstStr/, int retry/)
1c79356b A	316	{
	317	int error;
	318	UniChar uniStr[MAX_HFS_UNICODE_CHARS];
	319	size_t ucslen;
1c79356b A	320
	321	error = utf8_decodestr(srcStr, srcLen, uniStr, &ucslen, sizeof(uniStr), ':', 0);
	322	if (error == 0)
9bccf70c	323	error = unicode_to_hfs(vcb, ucslen, uniStr, dstStr, 1);
1c79356b A	324
	325	return error;
	326	}
	327
	328	int
	329	utf8_to_mac_roman(ByteCount srcLen, const unsigned char* srcStr, Str31 dstStr)
	330	{
	331	int error;
	332	UniChar uniStr[MAX_HFS_UNICODE_CHARS];
	333	size_t ucslen;
	334
	335	error = utf8_decodestr(srcStr, srcLen, uniStr, &ucslen, sizeof(uniStr), ':', 0);
	336	if (error == 0)
	337	error = unicode_to_mac_roman(uniStr, ucslen/sizeof(UniChar), dstStr);
	338
	339	return error;
	340	}
	341
	342	/*
	343	* HFS MacRoman to/from Unicode conversions are built into the kernel
	344	* All others hfs encodings are loadable.
	345	*/
	346
	347	/* 0x00A0 - 0x00FF = Latin 1 Supplement (30 total) */
2d21ac55	348	static u_int8_t gLatin1Table[] = {
1c79356b A	349	/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
	350	/* 0x00A0 */ 0xCA, 0xC1, 0xA2, 0xA3, 0xDB, 0xB4, '?', 0xA4, 0xAC, 0xA9, 0xBB, 0xC7, 0xC2, '?', 0xA8, 0xF8,
	351	/* 0x00B0 */ 0xA1, 0XB1, '?', '?', 0xAB, 0xB5, 0xA6, 0xe1, 0xFC, '?', 0xBC, 0xC8, '?', '?', '?', 0xC0,
	352	/* 0x00C0 */ '?', '?', '?', '?', '?', '?', 0xAE, '?', '?', '?', '?', '?', '?', '?', '?', '?',
	353	/* 0x00D0 */ '?', '?', '?', '?', '?', '?', '?', '?', 0xAF, '?', '?', '?', '?', '?', '?', 0xA7,
	354	/* 0x00E0 */ '?', '?', '?', '?', '?', '?', 0xBE, '?', '?', '?', '?', '?', '?', '?', '?', '?',
	355	/* 0x00F0 */ '?', '?', '?', '?', '?', '?', '?', 0xD6, 0xBF, '?', '?', '?', '?', '?', '?', '?'
	356	};
	357
	358	/* 0x02C0 - 0x02DF = Spacing Modifiers (8 total) */
2d21ac55	359	static u_int8_t gSpaceModsTable[] = {
1c79356b A	360	/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
	361	/* 0x02C0 */ '?', '?', '?', '?', '?', '?', 0xF6, 0xFF, '?', '?', '?', '?', '?', '?', '?', '?',
	362	/* 0x02D0 */ '?', '?', '?', '?', '?', '?', '?', '?', 0xF9, 0xFA, 0xFB, 0xFE, 0xF7, 0xFD, '?', '?'
	363	};
	364
	365	/* 0x2010 - 0x20AF = General Punctuation (17 total) */
2d21ac55	366	static u_int8_t gPunctTable[] = {
1c79356b A	367	/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
	368	/* 0x2010 */ '?', '?', '?', 0xd0, 0xd1, '?', '?', '?', 0xd4, 0xd5, 0xe2, '?', 0xd2, 0xd3, 0xe3, '?',
	369	/* 0x2020 */ 0xa0, 0xe0, 0xa5, '?', '?', '?', 0xc9, '?', '?', '?', '?', '?', '?', '?', '?', '?',
	370	/* 0x2030 */ 0xe4, '?', '?', '?', '?', '?', '?', '?', '?', 0xdc, 0xdd, '?', '?', '?', '?', '?',
	371	/* 0x2040 */ '?', '?', '?', '?', 0xda, '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?',
	372	/* 0x2050 */ '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?',
	373	/* 0x2060 */ '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?',
	374	/* 0x2070 */ '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?',
	375	/* 0x2080 */ '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?',
	376	/* 0x2090 */ '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?',
	377	/* 0x20A0 */ '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', 0xdb, '?', '?', '?'
	378	};
	379
	380	/* 0x22xx = Mathematical Operators (11 total) */
2d21ac55	381	static u_int8_t gMathTable[] = {
1c79356b A	382	/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
	383	/* 0x2200 */ '?', '?', 0xb6, '?', '?', '?', 0xc6, '?', '?', '?', '?', '?', '?', '?', '?', 0xb8,
	384	/* 0x2210 */ '?', 0xb7, '?', '?', '?', '?', '?', '?', '?', '?', 0xc3, '?', '?', '?', 0xb0, '?',
	385	/* 0x2220 */ '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', 0xba, '?', '?', '?', '?',
	386	/* 0x2230 */ '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?',
	387	/* 0x2240 */ '?', '?', '?', '?', '?', '?', '?', '?', 0xc5, '?', '?', '?', '?', '?', '?', '?',
	388	/* 0x2250 */ '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?',
	389	/* 0x2260 */ 0xad, '?', '?', '?', 0xb2, 0xb3, '?', '?'
	390	};
	391
	392	/* */
2d21ac55	393	static u_int8_t gReverseCombTable[] = {
1c79356b A	394	/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
	395	/* 0x40 */ 0xDA, 0x40, 0xDA, 0xDA, 0xDA, 0x56, 0xDA, 0xDA, 0xDA, 0x6C, 0xDA, 0xDA, 0xDA, 0xDA, 0x82, 0x98,
	396	/* 0x50 */ 0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xAE, 0xDA, 0xDA, 0xDA, 0xC4, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA,
	397	/* 0x60 */ 0xDA, 0x4B, 0xDA, 0xDA, 0xDA, 0x61, 0xDA, 0xDA, 0xDA, 0x77, 0xDA, 0xDA, 0xDA, 0xDA, 0x8D, 0xA3,
	398	/* 0x70 */ 0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xB9, 0xDA, 0xDA, 0xDA, 0xCF, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA, 0xDA,
	399
	400	/* Combining Diacritical Marks (0x0300 - 0x030A) */
	401	/* 0 1 2 3 4 5 6 7 8 9 A */
	402	/* 'A' */
	403	/* 0x0300 */ 0xCB, 0xE7, 0xE5, 0xCC, '?', '?', '?', '?', 0x80, '?', 0x81,
	404
	405	/* 'a' */
	406	/* 0x0300 */ 0x88, 0x87, 0x89, 0x8B, '?', '?', '?', '?', 0x8A, '?', 0x8C,
	407
	408	/* 'E' */
	409	/* 0x0300 */ 0xE9, 0x83, 0xE6, '?', '?', '?', '?', '?', 0xE8, '?', '?',
	410
	411	/* 'e' */
	412	/* 0x0300 */ 0x8F, 0x8E, 0x90, '?', '?', '?', '?', '?', 0x91, '?', '?',
	413
	414	/* 'I' */
	415	/* 0x0300 */ 0xED, 0xEA, 0xEB, '?', '?', '?', '?', '?', 0xEC, '?', '?',
	416
	417	/* 'i' */
	418	/* 0x0300 */ 0x93, 0x92, 0x94, '?', '?', '?', '?', '?', 0x95, '?', '?',
	419
	420	/* 'N' */
	421	/* 0x0300 */ '?', '?', '?', 0x84, '?', '?', '?', '?', '?', '?', '?',
	422
	423	/* 'n' */
	424	/* 0x0300 */ '?', '?', '?', 0x96, '?', '?', '?', '?', '?', '?', '?',
	425
	426	/* 'O' */
	427	/* 0x0300 */ 0xF1, 0xEE, 0xEF, 0xCD, '?', '?', '?', '?', 0x85, '?', '?',
	428
	429	/* 'o' */
	430	/* 0x0300 */ 0x98, 0x97, 0x99, 0x9B, '?', '?', '?', '?', 0x9A, '?', '?',
	431
	432	/* 'U' */
	433	/* 0x0300 */ 0xF4, 0xF2, 0xF3, '?', '?', '?', '?', '?', 0x86, '?', '?',
	434
	435	/* 'u' */
	436	/* 0x0300 */ 0x9D, 0x9C, 0x9E, '?', '?', '?', '?', '?', 0x9F, '?', '?',
	437
	438	/* 'Y' */
	439	/* 0x0300 */ '?', '?', '?', '?', '?', '?', '?', '?', 0xD9, '?', '?',
	440
	441	/* 'y' */
	442	/* 0x0300 */ '?', '?', '?', '?', '?', '?', '?', '?', 0xD8, '?', '?',
	443
	444	/* else */
	445	/* 0x0300 */ '?', '?', '?', '?', '?', '?', '?', '?', '?', '?', '?'
	446	};
	447
	448
	449	/*
	450	* Convert Unicode string into HFS MacRoman encoding
	451	*
	452	* Assumes Unicode input is fully decomposed
	453	*/
2d21ac55	454	static int unicode_to_mac_roman(UniChar *uni_str, u_int32_t unicodeChars, Str31 hfs_str)
1c79356b	455	{
2d21ac55	456	u_int8_t *p;
1c79356b A	457	const UniChar *u;
	458	UniChar c;
	459	UniChar mask;
2d21ac55 A	460	u_int16_t inputChars;
2d21ac55 A	461	u_int16_t pascalChars;
1c79356b	462	OSErr result = noErr;
2d21ac55 A	463	u_int8_t lsb;
	464	u_int8_t prevChar;
	465	u_int8_t mc;
1c79356b A	466
	467	mask = (UniChar) 0xFF80;
	468	p = &hfs_str[1];
	469	u = uni_str;
	470	inputChars = unicodeChars;
	471	pascalChars = prevChar = 0;
	472
	473	while (inputChars) {
	474	c = *(u++);
2d21ac55	475	lsb = (u_int8_t) c;
1c79356b A	476
	477	/*
	478	* If its not 7-bit ascii, then we need to map it
	479	*/
	480	if ( c & mask ) {
	481	mc = '?';
	482	switch (c & 0xFF00) {
	483	case 0x0000:
	484	if (lsb >= 0xA0)
	485	mc = gLatin1Table[lsb - 0xA0];
	486	break;
	487
	488	case 0x0200:
	489	if (lsb >= 0xC0 && lsb <= 0xDF)
	490	mc = gSpaceModsTable[lsb - 0xC0];
	491	break;
	492
	493	case 0x2000:
	494	if (lsb >= 0x10 && lsb <= 0xAF)
	495	mc = gPunctTable[lsb- 0x10];
	496	break;
	497
	498	case 0x2200:
	499	if (lsb <= 0x68)
	500	mc = gMathTable[lsb];
	501	break;
	502
	503	case 0x0300:
	504	if (c <= 0x030A) {
	505	if (prevChar >= 'A' && prevChar < 'z') {
	506	mc = gReverseCombTable[gReverseCombTable[prevChar - 0x40] + lsb];
	507	--p; /* backup over base char */
	508	--pascalChars;
	509	}
	510	} else {
	511	switch (c) {
	512	case 0x0327: /* combining cedilla */
	513	if (prevChar == 'C')
	514	mc = 0x82;
	515	else if (prevChar == 'c')
	516	mc = 0x8D;
	517	else
	518	break;
	519	--p; /* backup over base char */
	520	--pascalChars;
	521	break;
	522
	523	case 0x03A9: mc = 0xBD; break; /* omega */
	524
	525	case 0x03C0: mc = 0xB9; break; /* pi */
	526	}
	527	}
	528	break;
	529
	530	default:
	531	switch (c) {
	532	case 0x0131: mc = 0xf5; break; /* dotless i */
	533
	534	case 0x0152: mc = 0xce; break; /* OE */
	535
	536	case 0x0153: mc = 0xcf; break; /* oe */
	537
	538