X-Git-Url: https://wimlib.net/git/?p=wimlib;a=blobdiff_plain;f=src%2Fencoding.c;fp=src%2Fencoding.c;h=752ab847bed3cfeb6d8f7a7ae8341ebc9c47e7d8;hp=cf5dd66e04f058205043421062b8908d1403e7e4;hb=c94e4a479c2b77cc9046e7820c539f749fc15d6e;hpb=a44a8b095c17cc5993f7058331a0b3be162dda09 diff --git a/src/encoding.c b/src/encoding.c index cf5dd66e..752ab847 100644 --- a/src/encoding.c +++ b/src/encoding.c @@ -26,6 +26,7 @@ #endif #include "wimlib.h" +#include "wimlib/assert.h" #include "wimlib/encoding.h" #include "wimlib/endianness.h" #include "wimlib/error.h" @@ -383,28 +384,29 @@ iconv_global_cleanup(void) #endif } -/* Upper case table --- Borrowed from NTFS-3g +/* A table that maps from UCS-2 characters to their upper case equivalents. + * Index and array values are both CPU endian. + * Note: this is only an *approximation* of real UTF-16 case folding. + */ +static u16 upcase[65536]; + +/* + * Initialize the 'upcase' table. + * + * Code modified from NTFS-3g, original copyright notices below: * * Copyright (c) 2000-2004 Anton Altaparmakov * Copyright (c) 2002-2009 Szabolcs Szakacsits * Copyright (c) 2008-2011 Jean-Pierre Andre * Copyright (c) 2008 Bernhard Kaindl * - * License is GPLv2 or later. - */ - -/** - * ntfs_upcase_table_build - build the default upcase table for NTFS - * @uc: destination buffer where to store the built table - * @uc_len: size of destination buffer in bytes - * - * ntfs_upcase_table_build() builds the default upcase table for NTFS and - * stores it in the caller supplied buffer @uc of size @uc_len. + * License GPLv2 or later. (Or may actually be LGPL since it's in libntfs-3g.) * - * Note, @uc_len must be at least 128kiB in size or bad things will happen! + * The expanded table itself is the same as that used by Windows Vista for + * NTFS case insensitivity. */ -static void -ntfs_upcase_table_build(utf16lechar *uc, u32 uc_len) +void +init_upcase(void) { /* * This is the table as defined by Vista @@ -413,7 +415,7 @@ ntfs_upcase_table_build(utf16lechar *uc, u32 uc_len) * "Start" is inclusive and "End" is exclusive, every value has the * value of "Add" added to it. */ - static int uc_run_table[][3] = { /* Start, End, Add */ + static const u16 uc_run_table[][3] = { /* Start, End, Add */ {0x0061, 0x007b, -32}, {0x00e0, 0x00f7, -32}, {0x00f8, 0x00ff, -32}, {0x0256, 0x0258, -205}, {0x028a, 0x028c, -217}, {0x037b, 0x037e, 130}, {0x03ac, 0x03ad, -38}, {0x03ad, 0x03b0, -37}, {0x03b1, 0x03c2, -32}, @@ -429,13 +431,13 @@ ntfs_upcase_table_build(utf16lechar *uc, u32 uc_len) {0x1fb3, 0x1fb4, 9}, {0x1fcc, 0x1fcd, -9}, {0x1fd0, 0x1fd2, 8}, {0x1fe0, 0x1fe2, 8}, {0x1fe5, 0x1fe6, 7}, {0x1ffc, 0x1ffd, -9}, {0x2170, 0x2180, -16}, {0x24d0, 0x24ea, -26}, {0x2c30, 0x2c5f, -48}, - {0x2d00, 0x2d26, -7264}, {0xff41, 0xff5b, -32}, {0} + {0x2d00, 0x2d26, -7264}, {0xff41, 0xff5b, -32}, }; /* * "Start" is exclusive and "End" is inclusive, every second value is * decremented by one. */ - static int uc_dup_table[][2] = { /* Start, End */ + static const u16 uc_dup_table[][2] = { /* Start, End */ {0x0100, 0x012f}, {0x0132, 0x0137}, {0x0139, 0x0149}, {0x014a, 0x0178}, {0x0179, 0x017e}, {0x01a0, 0x01a6}, {0x01b3, 0x01b7}, {0x01cd, 0x01dd}, {0x01de, 0x01ef}, {0x01f4, 0x01f5}, {0x01f8, 0x01f9}, {0x01fa, 0x0220}, @@ -444,13 +446,13 @@ ntfs_upcase_table_build(utf16lechar *uc, u32 uc_len) {0x048a, 0x04bf}, {0x04c1, 0x04c4}, {0x04c5, 0x04c8}, {0x04c9, 0x04ce}, {0x04ec, 0x04ed}, {0x04d0, 0x04eb}, {0x04ee, 0x04f5}, {0x04f6, 0x0513}, {0x1e00, 0x1e95}, {0x1ea0, 0x1ef9}, {0x2183, 0x2184}, {0x2c60, 0x2c61}, - {0x2c67, 0x2c6c}, {0x2c75, 0x2c76}, {0x2c80, 0x2ce3}, {0} + {0x2c67, 0x2c6c}, {0x2c75, 0x2c76}, {0x2c80, 0x2ce3}, }; /* * Set the Unicode character at offset "Offset" to "Value". Note, * "Value" is host endian. */ - static int uc_byte_table[][2] = { /* Offset, Value */ + static const u16 uc_byte_table[][2] = { /* Offset, Value */ {0x00ff, 0x0178}, {0x0180, 0x0243}, {0x0183, 0x0182}, {0x0185, 0x0184}, {0x0188, 0x0187}, {0x018c, 0x018b}, {0x0192, 0x0191}, {0x0195, 0x01f6}, {0x0199, 0x0198}, {0x019a, 0x023d}, {0x019e, 0x0220}, {0x01a8, 0x01a7}, @@ -462,37 +464,45 @@ ntfs_upcase_table_build(utf16lechar *uc, u32 uc_len) {0x026b, 0x2c62}, {0x026f, 0x019c}, {0x0272, 0x019d}, {0x0275, 0x019f}, {0x027d, 0x2c64}, {0x0280, 0x01a6}, {0x0283, 0x01a9}, {0x0288, 0x01ae}, {0x0289, 0x0244}, {0x028c, 0x0245}, {0x0292, 0x01b7}, {0x03f2, 0x03f9}, - {0x04cf, 0x04c0}, {0x1d7d, 0x2c63}, {0x214e, 0x2132}, {0} + {0x04cf, 0x04c0}, {0x1d7d, 0x2c63}, {0x214e, 0x2132}, }; - int i, r; - int k, off; - - memset((char*)uc, 0, uc_len); - uc_len >>= 1; - if (uc_len > 65536) - uc_len = 65536; - for (i = 0; (u32)i < uc_len; i++) - uc[i] = cpu_to_le16(i); - for (r = 0; uc_run_table[r][0]; r++) { - off = uc_run_table[r][2]; - for (i = uc_run_table[r][0]; i < uc_run_table[r][1]; i++) - uc[i] = cpu_to_le16(i + off); - } - for (r = 0; uc_dup_table[r][0]; r++) - for (i = uc_dup_table[r][0]; i < uc_dup_table[r][1]; i += 2) - uc[i + 1] = cpu_to_le16(i); - for (r = 0; uc_byte_table[r][0]; r++) { - k = uc_byte_table[r][1]; - uc[uc_byte_table[r][0]] = cpu_to_le16(k); - } -} - -static utf16lechar upcase[65536]; -void -init_upcase(void) -{ - ntfs_upcase_table_build(upcase, ARRAY_LEN(upcase)); + for (u32 i = 0; i < 65536; i++) + upcase[i] = i; + + for (u32 r = 0; r < ARRAY_LEN(uc_run_table); r++) + for (u32 i = uc_run_table[r][0]; i < uc_run_table[r][1]; i++) + upcase[i] = i + uc_run_table[r][2]; + + for (u32 r = 0; r < ARRAY_LEN(uc_dup_table); r++) + for (u32 i = uc_dup_table[r][0]; i < uc_dup_table[r][1]; i += 2) + upcase[i + 1] = i; + + for (u32 r = 0; r < ARRAY_LEN(uc_byte_table); r++) + upcase[uc_byte_table[r][0]] = uc_byte_table[r][1]; + +#if 0 + /* Sanity checks */ + wimlib_assert(upcase['a'] == 'A'); + wimlib_assert(upcase['A'] == 'A'); + wimlib_assert(upcase['z'] == 'Z'); + wimlib_assert(upcase['Z'] == 'Z'); + wimlib_assert(upcase['1'] == '1'); + wimlib_assert(upcase[0x00e9] == 0x00c9); /* Latin letter e, with acute accent */ + wimlib_assert(upcase[0x00c9] == 0x00c9); + wimlib_assert(upcase[0x03c1] == 0x03a1); /* Greek letter rho */ + wimlib_assert(upcase[0x03a1] == 0x03a1); + wimlib_assert(upcase[0x0436] == 0x0416); /* Cyrillic letter zhe */ + wimlib_assert(upcase[0x0416] == 0x0416); + wimlib_assert(upcase[0x0567] == 0x0537); /* Armenian letter eh */ + wimlib_assert(upcase[0x0537] == 0x0537); + wimlib_assert(upcase[0x24d0] == 0x24b6); /* Circled Latin letter A + (is that a real character???) */ + wimlib_assert(upcase[0x24b6] == 0x24b6); + wimlib_assert(upcase[0x2603] == 0x2603); /* Note to self: Upper case + snowman symbol does not + exist. */ +#endif } /* Compare UTF-16LE strings case-sensitively (%ignore_case == false) or @@ -511,8 +521,8 @@ cmp_utf16le_strings(const utf16lechar *s1, size_t n1, if (ignore_case) { for (size_t i = 0; i < n; i++) { - u16 c1 = le16_to_cpu(upcase[le16_to_cpu(s1[i])]); - u16 c2 = le16_to_cpu(upcase[le16_to_cpu(s2[i])]); + u16 c1 = upcase[le16_to_cpu(s1[i])]; + u16 c2 = upcase[le16_to_cpu(s2[i])]; if (c1 != c2) return (c1 < c2) ? -1 : 1; }