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Diffstat (limited to 'lib/libefivar/libefivar.c')
| -rw-r--r-- | lib/libefivar/libefivar.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/lib/libefivar/libefivar.c b/lib/libefivar/libefivar.c new file mode 100644 index 000000000000..951c484f5e3a --- /dev/null +++ b/lib/libefivar/libefivar.c @@ -0,0 +1,188 @@ +/*- + * Copyright (c) 2010 Marcel Moolenaar + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <errno.h> +#include <stddef.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/efi.h> +#include <machine/efi.h> + +#include "libefivar_int.h" + +#include <stdio.h> + +/* + * If nm were converted to utf8, what what would strlen + * return on the resulting string? + */ +static size_t +utf8_len_of_ucs2(const efi_char *nm) +{ + size_t len; + efi_char c; + + len = 0; + while (*nm) { + c = *nm++; + if (c > 0x7ff) + len += 3; + else if (c > 0x7f) + len += 2; + else + len++; + } + + return (len); +} + +int +libefi_ucs2_to_utf8(const efi_char *nm, char **name) +{ + size_t len, sz; + efi_char c; + char *cp; + int freeit = *name == NULL; + + sz = utf8_len_of_ucs2(nm) + 1; + len = 0; + if (*name != NULL) + cp = *name; + else + cp = *name = malloc(sz); + if (*name == NULL) + return (ENOMEM); + + while (*nm) { + c = *nm++; + if (c > 0x7ff) { + if (len++ < sz) + *cp++ = (char)(0xE0 | (c >> 12)); + if (len++ < sz) + *cp++ = (char)(0x80 | ((c >> 6) & 0x3f)); + if (len++ < sz) + *cp++ = (char)(0x80 | (c & 0x3f)); + } else if (c > 0x7f) { + if (len++ < sz) + *cp++ = (char)(0xC0 | ((c >> 6) & 0x1f)); + if (len++ < sz) + *cp++ = (char)(0x80 | (c & 0x3f)); + } else { + if (len++ < sz) + *cp++ = (char)(c & 0x7f); + } + } + + if (len >= sz) { + /* Absent bugs, we'll never return EOVERFLOW */ + if (freeit) + free(*name); + return (EOVERFLOW); + } + *cp++ = '\0'; + + return (0); +} + +int +libefi_utf8_to_ucs2(const char *name, efi_char **nmp, size_t *len) +{ + efi_char *nm; + size_t sz; + uint32_t ucs4; + int c, bytes; + int freeit = *nmp == NULL; + + sz = strlen(name) * 2 + 2; + if (*nmp == NULL) + *nmp = malloc(sz); + nm = *nmp; + *len = sz; + + ucs4 = 0; + bytes = 0; + while (sz > 1 && *name != '\0') { + c = *name++; + /* + * Conditionalize on the two major character types: + * initial and followup characters. + */ + if ((c & 0xc0) != 0x80) { + /* Initial characters. */ + if (bytes != 0) { + if (freeit) + free(nm); + return (EILSEQ); + } + if ((c & 0xf8) == 0xf0) { + ucs4 = c & 0x07; + bytes = 3; + } else if ((c & 0xf0) == 0xe0) { + ucs4 = c & 0x0f; + bytes = 2; + } else if ((c & 0xe0) == 0xc0) { + ucs4 = c & 0x1f; + bytes = 1; + } else { + ucs4 = c & 0x7f; + bytes = 0; + } + } else { + /* Followup characters. */ + if (bytes > 0) { + ucs4 = (ucs4 << 6) + (c & 0x3f); + bytes--; + } else if (bytes == 0) { + if (freeit) + free(nm); + return (EILSEQ); + } + } + if (bytes == 0) { + if (ucs4 > 0xffff) { + if (freeit) + free(nm); + return (EILSEQ); + } + *nm++ = (efi_char)ucs4; + sz -= 2; + } + } + if (sz < 2) { + if (freeit) + free(nm); + return (EDOOFUS); + } + sz -= 2; + *nm = 0; + *len -= sz; + return (0); +} |