From: Matt Fleming <matt@codeblueprint.co.uk>
To: Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H . Peter Anvin" <hpa@zytor.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Peter Jones <pjones@redhat.com>,
linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org,
Matt Fleming <matt@codeblueprint.co.uk>,
"Lee, Chun-Yi" <jlee@suse.com>,
Matthew Garrett <mjg59@coreos.com>
Subject: [PATCH 1/5] lib/ucs2_string: Add ucs2 -> utf8 helper functions
Date: Fri, 12 Feb 2016 11:27:08 +0000 [thread overview]
Message-ID: <1455276432-9931-2-git-send-email-matt@codeblueprint.co.uk> (raw)
In-Reply-To: <1455276432-9931-1-git-send-email-matt@codeblueprint.co.uk>
From: Peter Jones <pjones@redhat.com>
This adds ucs2_utf8size(), which tells us how big our ucs2 string is in
bytes, and ucs2_as_utf8, which translates from ucs2 to utf8..
Signed-off-by: Peter Jones <pjones@redhat.com>
Tested-by: "Lee, Chun-Yi" <jlee@suse.com>
Acked-by: Matthew Garrett <mjg59@coreos.com>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
---
include/linux/ucs2_string.h | 4 +++
lib/ucs2_string.c | 62 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 66 insertions(+)
diff --git a/include/linux/ucs2_string.h b/include/linux/ucs2_string.h
index cbb20afdbc01..bb679b48f408 100644
--- a/include/linux/ucs2_string.h
+++ b/include/linux/ucs2_string.h
@@ -11,4 +11,8 @@ unsigned long ucs2_strlen(const ucs2_char_t *s);
unsigned long ucs2_strsize(const ucs2_char_t *data, unsigned long maxlength);
int ucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len);
+unsigned long ucs2_utf8size(const ucs2_char_t *src);
+unsigned long ucs2_as_utf8(u8 *dest, const ucs2_char_t *src,
+ unsigned long maxlength);
+
#endif /* _LINUX_UCS2_STRING_H_ */
diff --git a/lib/ucs2_string.c b/lib/ucs2_string.c
index 6f500ef2301d..17dd74e21ef9 100644
--- a/lib/ucs2_string.c
+++ b/lib/ucs2_string.c
@@ -49,3 +49,65 @@ ucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len)
}
}
EXPORT_SYMBOL(ucs2_strncmp);
+
+unsigned long
+ucs2_utf8size(const ucs2_char_t *src)
+{
+ unsigned long i;
+ unsigned long j = 0;
+
+ for (i = 0; i < ucs2_strlen(src); i++) {
+ u16 c = src[i];
+
+ if (c > 0x800)
+ j += 3;
+ else if (c > 0x80)
+ j += 2;
+ else
+ j += 1;
+ }
+
+ return j;
+}
+EXPORT_SYMBOL(ucs2_utf8size);
+
+/*
+ * copy at most maxlength bytes of whole utf8 characters to dest from the
+ * ucs2 string src.
+ *
+ * The return value is the number of characters copied, not including the
+ * final NUL character.
+ */
+unsigned long
+ucs2_as_utf8(u8 *dest, const ucs2_char_t *src, unsigned long maxlength)
+{
+ unsigned int i;
+ unsigned long j = 0;
+ unsigned long limit = ucs2_strnlen(src, maxlength);
+
+ for (i = 0; maxlength && i < limit; i++) {
+ u16 c = src[i];
+
+ if (c > 0x800) {
+ if (maxlength < 3)
+ break;
+ maxlength -= 3;
+ dest[j++] = 0xe0 | (c & 0xf000) >> 12;
+ dest[j++] = 0x80 | (c & 0x0fc0) >> 8;
+ dest[j++] = 0x80 | (c & 0x003f);
+ } else if (c > 0x80) {
+ if (maxlength < 2)
+ break;
+ maxlength -= 2;
+ dest[j++] = 0xc0 | (c & 0xfe0) >> 5;
+ dest[j++] = 0x80 | (c & 0x01f);
+ } else {
+ maxlength -= 1;
+ dest[j++] = c & 0x7f;
+ }
+ }
+ if (maxlength)
+ dest[j] = '\0';
+ return j;
+}
+EXPORT_SYMBOL(ucs2_as_utf8);
--
2.6.2
next prev parent reply other threads:[~2016-02-12 11:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-12 11:27 [GIT PULL 0/5] EFI urgent fixes Matt Fleming
2016-02-12 11:27 ` Matt Fleming [this message]
2016-02-12 11:27 ` [PATCH 2/5] efi: Use ucs2_as_utf8 in efivarfs instead of open coding a bad version Matt Fleming
2016-02-18 5:34 ` H. Peter Anvin
2016-02-12 11:27 ` [PATCH 3/5] efi: Do variable name validation tests in utf8 Matt Fleming
2016-02-12 11:27 ` [PATCH 4/5] efi: Make our variable validation list include the guid Matt Fleming
2016-02-12 11:27 ` [PATCH 5/5] efi: Make efivarfs entries immutable by default Matt Fleming
2016-02-15 10:50 ` Matt Fleming
2016-02-16 12:15 ` [GIT PULL 0/5] EFI urgent fixes Ingo Molnar
2016-02-16 12:52 ` Matt Fleming
2016-02-17 7:59 ` Ingo Molnar
2016-02-17 10:16 ` Matt Fleming
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