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libisofs/libisofs/hfsplus_case.c

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/*
* Copyright (c) 2012 Thomas Schmitt
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* or later as published by the Free Software Foundation.
* See COPYING file for details.
*/
/**
* Maps UTF-16BE double-byte characters to the representative of their
* equivalence class under the relation of HFS+ case-insensitivity.
*/
#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif
#include "libisofs.h"
/* The translation list utf16be_transl was generated by a program which
compared input and output of existing example code by Apple Inc.
found published on
http://developer.apple.com/legacy/mac/library/#technotes/tn/tn1150.html
Each deviation was recorded as pair of byte pairs. The first pair gives
the input, the second pair gives the output. If a byte pair is not mentioned
in this list as input, then it gets mapped to itself.
Pairs which get mapped to pair 0,0 shall be ignored with HFS+ comparisons.
Another comparison run verified that both implementations yield the same
character translation with all 65536 possible input bit patterns.
*/
static uint8_t utf16be_transl[] = {
0x00, 0x00, 0xff, 0xff,
0x00, 0x41, 0x00, 0x61,
0x00, 0x42, 0x00, 0x62,
0x00, 0x43, 0x00, 0x63,
0x00, 0x44, 0x00, 0x64,
0x00, 0x45, 0x00, 0x65,
0x00, 0x46, 0x00, 0x66,
0x00, 0x47, 0x00, 0x67,
0x00, 0x48, 0x00, 0x68,
0x00, 0x49, 0x00, 0x69,
0x00, 0x4a, 0x00, 0x6a,
0x00, 0x4b, 0x00, 0x6b,
0x00, 0x4c, 0x00, 0x6c,
0x00, 0x4d, 0x00, 0x6d,
0x00, 0x4e, 0x00, 0x6e,
0x00, 0x4f, 0x00, 0x6f,
0x00, 0x50, 0x00, 0x70,
0x00, 0x51, 0x00, 0x71,
0x00, 0x52, 0x00, 0x72,
0x00, 0x53, 0x00, 0x73,
0x00, 0x54, 0x00, 0x74,
0x00, 0x55, 0x00, 0x75,
0x00, 0x56, 0x00, 0x76,
0x00, 0x57, 0x00, 0x77,
0x00, 0x58, 0x00, 0x78,
0x00, 0x59, 0x00, 0x79,
0x00, 0x5a, 0x00, 0x7a,
0x00, 0xc6, 0x00, 0xe6,
0x00, 0xd0, 0x00, 0xf0,
0x00, 0xd8, 0x00, 0xf8,
0x00, 0xde, 0x00, 0xfe,
0x01, 0x10, 0x01, 0x11,
0x01, 0x26, 0x01, 0x27,
0x01, 0x32, 0x01, 0x33,
0x01, 0x3f, 0x01, 0x40,
0x01, 0x41, 0x01, 0x42,
0x01, 0x4a, 0x01, 0x4b,
0x01, 0x52, 0x01, 0x53,
0x01, 0x66, 0x01, 0x67,
0x01, 0x81, 0x02, 0x53,
0x01, 0x82, 0x01, 0x83,
0x01, 0x84, 0x01, 0x85,
0x01, 0x86, 0x02, 0x54,
0x01, 0x87, 0x01, 0x88,
0x01, 0x89, 0x02, 0x56,
0x01, 0x8a, 0x02, 0x57,
0x01, 0x8b, 0x01, 0x8c,
0x01, 0x8e, 0x01, 0xdd,
0x01, 0x8f, 0x02, 0x59,
0x01, 0x90, 0x02, 0x5b,
0x01, 0x91, 0x01, 0x92,
0x01, 0x93, 0x02, 0x60,
0x01, 0x94, 0x02, 0x63,
0x01, 0x96, 0x02, 0x69,
0x01, 0x97, 0x02, 0x68,
0x01, 0x98, 0x01, 0x99,
0x01, 0x9c, 0x02, 0x6f,
0x01, 0x9d, 0x02, 0x72,
0x01, 0x9f, 0x02, 0x75,
0x01, 0xa2, 0x01, 0xa3,
0x01, 0xa4, 0x01, 0xa5,
0x01, 0xa7, 0x01, 0xa8,
0x01, 0xa9, 0x02, 0x83,
0x01, 0xac, 0x01, 0xad,
0x01, 0xae, 0x02, 0x88,
0x01, 0xb1, 0x02, 0x8a,
0x01, 0xb2, 0x02, 0x8b,
0x01, 0xb3, 0x01, 0xb4,
0x01, 0xb5, 0x01, 0xb6,
0x01, 0xb7, 0x02, 0x92,
0x01, 0xb8, 0x01, 0xb9,
0x01, 0xbc, 0x01, 0xbd,
0x01, 0xc4, 0x01, 0xc6,
0x01, 0xc5, 0x01, 0xc6,
0x01, 0xc7, 0x01, 0xc9,
0x01, 0xc8, 0x01, 0xc9,
0x01, 0xca, 0x01, 0xcc,
0x01, 0xcb, 0x01, 0xcc,
0x01, 0xe4, 0x01, 0xe5,
0x01, 0xf1, 0x01, 0xf3,
0x01, 0xf2, 0x01, 0xf3,
0x03, 0x91, 0x03, 0xb1,
0x03, 0x92, 0x03, 0xb2,
0x03, 0x93, 0x03, 0xb3,
0x03, 0x94, 0x03, 0xb4,
0x03, 0x95, 0x03, 0xb5,
0x03, 0x96, 0x03, 0xb6,
0x03, 0x97, 0x03, 0xb7,
0x03, 0x98, 0x03, 0xb8,
0x03, 0x99, 0x03, 0xb9,
0x03, 0x9a, 0x03, 0xba,
0x03, 0x9b, 0x03, 0xbb,
0x03, 0x9c, 0x03, 0xbc,
0x03, 0x9d, 0x03, 0xbd,
0x03, 0x9e, 0x03, 0xbe,
0x03, 0x9f, 0x03, 0xbf,
0x03, 0xa0, 0x03, 0xc0,
0x03, 0xa1, 0x03, 0xc1,
0x03, 0xa3, 0x03, 0xc3,
0x03, 0xa4, 0x03, 0xc4,
0x03, 0xa5, 0x03, 0xc5,
0x03, 0xa6, 0x03, 0xc6,
0x03, 0xa7, 0x03, 0xc7,
0x03, 0xa8, 0x03, 0xc8,
0x03, 0xa9, 0x03, 0xc9,
0x03, 0xe2, 0x03, 0xe3,
0x03, 0xe4, 0x03, 0xe5,
0x03, 0xe6, 0x03, 0xe7,
0x03, 0xe8, 0x03, 0xe9,
0x03, 0xea, 0x03, 0xeb,
0x03, 0xec, 0x03, 0xed,
0x03, 0xee, 0x03, 0xef,
0x04, 0x02, 0x04, 0x52,
0x04, 0x04, 0x04, 0x54,
0x04, 0x05, 0x04, 0x55,
0x04, 0x06, 0x04, 0x56,
0x04, 0x08, 0x04, 0x58,
0x04, 0x09, 0x04, 0x59,
0x04, 0x0a, 0x04, 0x5a,
0x04, 0x0b, 0x04, 0x5b,
0x04, 0x0f, 0x04, 0x5f,
0x04, 0x10, 0x04, 0x30,
0x04, 0x11, 0x04, 0x31,
0x04, 0x12, 0x04, 0x32,
0x04, 0x13, 0x04, 0x33,
0x04, 0x14, 0x04, 0x34,
0x04, 0x15, 0x04, 0x35,
0x04, 0x16, 0x04, 0x36,
0x04, 0x17, 0x04, 0x37,
0x04, 0x18, 0x04, 0x38,
0x04, 0x1a, 0x04, 0x3a,
0x04, 0x1b, 0x04, 0x3b,
0x04, 0x1c, 0x04, 0x3c,
0x04, 0x1d, 0x04, 0x3d,
0x04, 0x1e, 0x04, 0x3e,
0x04, 0x1f, 0x04, 0x3f,
0x04, 0x20, 0x04, 0x40,
0x04, 0x21, 0x04, 0x41,
0x04, 0x22, 0x04, 0x42,
0x04, 0x23, 0x04, 0x43,
0x04, 0x24, 0x04, 0x44,
0x04, 0x25, 0x04, 0x45,
0x04, 0x26, 0x04, 0x46,
0x04, 0x27, 0x04, 0x47,
0x04, 0x28, 0x04, 0x48,
0x04, 0x29, 0x04, 0x49,
0x04, 0x2a, 0x04, 0x4a,
0x04, 0x2b, 0x04, 0x4b,
0x04, 0x2c, 0x04, 0x4c,
0x04, 0x2d, 0x04, 0x4d,
0x04, 0x2e, 0x04, 0x4e,
0x04, 0x2f, 0x04, 0x4f,
0x04, 0x60, 0x04, 0x61,
0x04, 0x62, 0x04, 0x63,
0x04, 0x64, 0x04, 0x65,
0x04, 0x66, 0x04, 0x67,
0x04, 0x68, 0x04, 0x69,
0x04, 0x6a, 0x04, 0x6b,
0x04, 0x6c, 0x04, 0x6d,
0x04, 0x6e, 0x04, 0x6f,
0x04, 0x70, 0x04, 0x71,
0x04, 0x72, 0x04, 0x73,
0x04, 0x74, 0x04, 0x75,
0x04, 0x78, 0x04, 0x79,
0x04, 0x7a, 0x04, 0x7b,
0x04, 0x7c, 0x04, 0x7d,
0x04, 0x7e, 0x04, 0x7f,
0x04, 0x80, 0x04, 0x81,
0x04, 0x90, 0x04, 0x91,
0x04, 0x92, 0x04, 0x93,
0x04, 0x94, 0x04, 0x95,
0x04, 0x96, 0x04, 0x97,
0x04, 0x98, 0x04, 0x99,
0x04, 0x9a, 0x04, 0x9b,
0x04, 0x9c, 0x04, 0x9d,
0x04, 0x9e, 0x04, 0x9f,
0x04, 0xa0, 0x04, 0xa1,
0x04, 0xa2, 0x04, 0xa3,
0x04, 0xa4, 0x04, 0xa5,
0x04, 0xa6, 0x04, 0xa7,
0x04, 0xa8, 0x04, 0xa9,
0x04, 0xaa, 0x04, 0xab,
0x04, 0xac, 0x04, 0xad,
0x04, 0xae, 0x04, 0xaf,
0x04, 0xb0, 0x04, 0xb1,
0x04, 0xb2, 0x04, 0xb3,
0x04, 0xb4, 0x04, 0xb5,
0x04, 0xb6, 0x04, 0xb7,
0x04, 0xb8, 0x04, 0xb9,
0x04, 0xba, 0x04, 0xbb,
0x04, 0xbc, 0x04, 0xbd,
0x04, 0xbe, 0x04, 0xbf,
0x04, 0xc3, 0x04, 0xc4,
0x04, 0xc7, 0x04, 0xc8,
0x04, 0xcb, 0x04, 0xcc,
0x05, 0x31, 0x05, 0x61,
0x05, 0x32, 0x05, 0x62,
0x05, 0x33, 0x05, 0x63,
0x05, 0x34, 0x05, 0x64,
0x05, 0x35, 0x05, 0x65,
0x05, 0x36, 0x05, 0x66,
0x05, 0x37, 0x05, 0x67,
0x05, 0x38, 0x05, 0x68,
0x05, 0x39, 0x05, 0x69,
0x05, 0x3a, 0x05, 0x6a,
0x05, 0x3b, 0x05, 0x6b,
0x05, 0x3c, 0x05, 0x6c,
0x05, 0x3d, 0x05, 0x6d,
0x05, 0x3e, 0x05, 0x6e,
0x05, 0x3f, 0x05, 0x6f,
0x05, 0x40, 0x05, 0x70,
0x05, 0x41, 0x05, 0x71,
0x05, 0x42, 0x05, 0x72,
0x05, 0x43, 0x05, 0x73,
0x05, 0x44, 0x05, 0x74,
0x05, 0x45, 0x05, 0x75,
0x05, 0x46, 0x05, 0x76,
0x05, 0x47, 0x05, 0x77,
0x05, 0x48, 0x05, 0x78,
0x05, 0x49, 0x05, 0x79,
0x05, 0x4a, 0x05, 0x7a,
0x05, 0x4b, 0x05, 0x7b,
0x05, 0x4c, 0x05, 0x7c,
0x05, 0x4d, 0x05, 0x7d,
0x05, 0x4e, 0x05, 0x7e,
0x05, 0x4f, 0x05, 0x7f,
0x05, 0x50, 0x05, 0x80,
0x05, 0x51, 0x05, 0x81,
0x05, 0x52, 0x05, 0x82,
0x05, 0x53, 0x05, 0x83,
0x05, 0x54, 0x05, 0x84,
0x05, 0x55, 0x05, 0x85,
0x05, 0x56, 0x05, 0x86,
0x10, 0xa0, 0x10, 0xd0,
0x10, 0xa1, 0x10, 0xd1,
0x10, 0xa2, 0x10, 0xd2,
0x10, 0xa3, 0x10, 0xd3,
0x10, 0xa4, 0x10, 0xd4,
0x10, 0xa5, 0x10, 0xd5,
0x10, 0xa6, 0x10, 0xd6,
0x10, 0xa7, 0x10, 0xd7,
0x10, 0xa8, 0x10, 0xd8,
0x10, 0xa9, 0x10, 0xd9,
0x10, 0xaa, 0x10, 0xda,
0x10, 0xab, 0x10, 0xdb,
0x10, 0xac, 0x10, 0xdc,
0x10, 0xad, 0x10, 0xdd,
0x10, 0xae, 0x10, 0xde,
0x10, 0xaf, 0x10, 0xdf,
0x10, 0xb0, 0x10, 0xe0,
0x10, 0xb1, 0x10, 0xe1,
0x10, 0xb2, 0x10, 0xe2,
0x10, 0xb3, 0x10, 0xe3,
0x10, 0xb4, 0x10, 0xe4,
0x10, 0xb5, 0x10, 0xe5,
0x10, 0xb6, 0x10, 0xe6,
0x10, 0xb7, 0x10, 0xe7,
0x10, 0xb8, 0x10, 0xe8,
0x10, 0xb9, 0x10, 0xe9,
0x10, 0xba, 0x10, 0xea,
0x10, 0xbb, 0x10, 0xeb,
0x10, 0xbc, 0x10, 0xec,
0x10, 0xbd, 0x10, 0xed,
0x10, 0xbe, 0x10, 0xee,
0x10, 0xbf, 0x10, 0xef,
0x10, 0xc0, 0x10, 0xf0,
0x10, 0xc1, 0x10, 0xf1,
0x10, 0xc2, 0x10, 0xf2,
0x10, 0xc3, 0x10, 0xf3,
0x10, 0xc4, 0x10, 0xf4,
0x10, 0xc5, 0x10, 0xf5,
0x20, 0x0c, 0x00, 0x00,
0x20, 0x0d, 0x00, 0x00,
0x20, 0x0e, 0x00, 0x00,
0x20, 0x0f, 0x00, 0x00,
0x20, 0x2a, 0x00, 0x00,
0x20, 0x2b, 0x00, 0x00,
0x20, 0x2c, 0x00, 0x00,
0x20, 0x2d, 0x00, 0x00,
0x20, 0x2e, 0x00, 0x00,
0x20, 0x6a, 0x00, 0x00,
0x20, 0x6b, 0x00, 0x00,
0x20, 0x6c, 0x00, 0x00,
0x20, 0x6d, 0x00, 0x00,
0x20, 0x6e, 0x00, 0x00,
0x20, 0x6f, 0x00, 0x00,
0x21, 0x60, 0x21, 0x70,
0x21, 0x61, 0x21, 0x71,
0x21, 0x62, 0x21, 0x72,
0x21, 0x63, 0x21, 0x73,
0x21, 0x64, 0x21, 0x74,
0x21, 0x65, 0x21, 0x75,
0x21, 0x66, 0x21, 0x76,
0x21, 0x67, 0x21, 0x77,
0x21, 0x68, 0x21, 0x78,
0x21, 0x69, 0x21, 0x79,
0x21, 0x6a, 0x21, 0x7a,
0x21, 0x6b, 0x21, 0x7b,
0x21, 0x6c, 0x21, 0x7c,
0x21, 0x6d, 0x21, 0x7d,
0x21, 0x6e, 0x21, 0x7e,
0x21, 0x6f, 0x21, 0x7f,
0xfe, 0xff, 0x00, 0x00,
0xff, 0x21, 0xff, 0x41,
0xff, 0x22, 0xff, 0x42,
0xff, 0x23, 0xff, 0x43,
0xff, 0x24, 0xff, 0x44,
0xff, 0x25, 0xff, 0x45,
0xff, 0x26, 0xff, 0x46,
0xff, 0x27, 0xff, 0x47,
0xff, 0x28, 0xff, 0x48,
0xff, 0x29, 0xff, 0x49,
0xff, 0x2a, 0xff, 0x4a,
0xff, 0x2b, 0xff, 0x4b,
0xff, 0x2c, 0xff, 0x4c,
0xff, 0x2d, 0xff, 0x4d,
0xff, 0x2e, 0xff, 0x4e,
0xff, 0x2f, 0xff, 0x4f,
0xff, 0x30, 0xff, 0x50,
0xff, 0x31, 0xff, 0x51,
0xff, 0x32, 0xff, 0x52,
0xff, 0x33, 0xff, 0x53,
0xff, 0x34, 0xff, 0x54,
0xff, 0x35, 0xff, 0x55,
0xff, 0x36, 0xff, 0x56,
0xff, 0x37, 0xff, 0x57,
0xff, 0x38, 0xff, 0x58,
0xff, 0x39, 0xff, 0x59,
0xff, 0x3a, 0xff, 0x5a,
0x00
};
static int utf16be_transl_count = 329;
/* These are the start indice in utf16be_transl[] for the page numbers 0 to 9
as classified by function what_page().
As soon as the first byte of the input pair in utf16be_transl[] changes,
the search can be ended and output is equal to input.
If page -1 is returned by what_page(), then input is equal to output.
*/
static int utf16be_transl_starts[] = {
0, 31, 81, 112, 195, 233, 271, 286, 302, 303
};
static int what_page(uint16_t x)
{
switch(((uint8_t *) &x)[0]) {
case 0:
return 0;
case 1:
return 1;
case 3:
return 2;
case 4:
return 3;
case 5:
return 4;
case 16:
return 5;
case 32:
return 6;
case 33:
return 7;
case 254:
return 8;
case 255:
return 9;
default:
return -1; /* no mapping */
}
}
/* Accelerator for the ASCII subset which is expected to be the most
frequently used one.
*/
static uint16_t cmp_name_page0(uint16_t x)
{
uint8_t *low;
low = ((uint8_t *) &x) + 1;
if (x == 0)
return 0xffff;
if (*low <= 0x40)
;
else if (*low <= 0x5a)
*low = *low + 0x20;
else if (*low < 0xc6)
;
else if (*low == 0xc6)
*low = 0xe6;
else if (*low == 0xd0)
*low = 0xf0;
else if (*low == 0xd8)
*low = 0xf8;
else if (*low == 0xde)
*low = 0xfe;
return x;
}
/* Converts a character into the representative of its HFS+ equivalence
class.
@param x The UTF-16BE character to be converted.
@return 0 = ignore character with comparisons
else the case-insensitive character.
*/
uint16_t iso_hfsplus_cichar(uint16_t x)
{
int page, i;
uint16_t ret;
uint8_t low, high;
high = ((uint8_t *) &x)[0];
low = ((uint8_t *) &x)[1];
page = what_page(x);
if (page < 0)
return x; /* No translation needed */
if (page == 0)
return cmp_name_page0(x); /* Accelerator for ASCII subset */
for (i = utf16be_transl_starts[page] * 4; i < utf16be_transl_count * 4;
i += 4) {
if (utf16be_transl[i] != high)
break;
if (utf16be_transl[i + 1] == low) {
((uint8_t *) &ret)[0] = utf16be_transl[i + 2];
((uint8_t *) &ret)[1] = utf16be_transl[i + 3];
return ret;
}
}
return x;
}
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