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Diffstat (limited to 'qemu/util/unicode.c')
-rw-r--r-- | qemu/util/unicode.c | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/qemu/util/unicode.c b/qemu/util/unicode.c deleted file mode 100644 index a812a3517..000000000 --- a/qemu/util/unicode.c +++ /dev/null @@ -1,101 +0,0 @@ -/* - * Dealing with Unicode - * - * Copyright (C) 2013 Red Hat, Inc. - * - * Authors: - * Markus Armbruster <armbru@redhat.com> - * - * This work is licensed under the terms of the GNU GPL, version 2 or - * later. See the COPYING file in the top-level directory. - */ - -#include "qemu/osdep.h" -#include "qemu/unicode.h" - -/** - * mod_utf8_codepoint: - * @s: string encoded in modified UTF-8 - * @n: maximum number of bytes to read from @s, if less than 6 - * @end: set to end of sequence on return - * - * Convert the modified UTF-8 sequence at the start of @s. Modified - * UTF-8 is exactly like UTF-8, except U+0000 is encoded as - * "\xC0\x80". - * - * If @n is zero or @s points to a zero byte, the sequence is invalid, - * and @end is set to @s. - * - * If @s points to an impossible byte (0xFE or 0xFF) or a continuation - * byte, the sequence is invalid, and @end is set to @s + 1 - * - * Else, the first byte determines how many continuation bytes are - * expected. If there are fewer, the sequence is invalid, and @end is - * set to @s + 1 + actual number of continuation bytes. Else, the - * sequence is well-formed, and @end is set to @s + 1 + expected - * number of continuation bytes. - * - * A well-formed sequence is valid unless it encodes a codepoint - * outside the Unicode range U+0000..U+10FFFF, one of Unicode's 66 - * noncharacters, a surrogate codepoint, or is overlong. Except the - * overlong sequence "\xC0\x80" is valid. - * - * Conversion succeeds if and only if the sequence is valid. - * - * Returns: the Unicode codepoint on success, -1 on failure. - */ -int mod_utf8_codepoint(const char *s, size_t n, char **end) -{ - static int min_cp[5] = { 0x80, 0x800, 0x10000, 0x200000, 0x4000000 }; - const unsigned char *p; - unsigned byte, mask, len, i; - int cp; - - if (n == 0 || *s == 0) { - /* empty sequence */ - *end = (char *)s; - return -1; - } - - p = (const unsigned char *)s; - byte = *p++; - if (byte < 0x80) { - cp = byte; /* one byte sequence */ - } else if (byte >= 0xFE) { - cp = -1; /* impossible bytes 0xFE, 0xFF */ - } else if ((byte & 0x40) == 0) { - cp = -1; /* unexpected continuation byte */ - } else { - /* multi-byte sequence */ - len = 0; - for (mask = 0x80; byte & mask; mask >>= 1) { - len++; - } - assert(len > 1 && len < 7); - cp = byte & (mask - 1); - for (i = 1; i < len; i++) { - byte = i < n ? *p : 0; - if ((byte & 0xC0) != 0x80) { - cp = -1; /* continuation byte missing */ - goto out; - } - p++; - cp <<= 6; - cp |= byte & 0x3F; - } - if (cp > 0x10FFFF) { - cp = -1; /* beyond Unicode range */ - } else if ((cp >= 0xFDD0 && cp <= 0xFDEF) - || (cp & 0xFFFE) == 0xFFFE) { - cp = -1; /* noncharacter */ - } else if (cp >= 0xD800 && cp <= 0xDFFF) { - cp = -1; /* surrogate code point */ - } else if (cp < min_cp[len - 2] && !(cp == 0 && len == 2)) { - cp = -1; /* overlong, not \xC0\x80 */ - } - } - -out: - *end = (char *)p; - return cp; -} |