Provide a conversion function from utf8 to utf16.
Add missing #include <linux/types.h> in include/charset.h. Remove superfluous #include <common.h> in lib/charset.c.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- v3 no change v2 new patch --- include/charset.h | 15 +++++++++++++++ lib/charset.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 71 insertions(+), 1 deletion(-)
diff --git a/include/charset.h b/include/charset.h index 37a3278499..2662c2f7c9 100644 --- a/include/charset.h +++ b/include/charset.h @@ -9,6 +9,8 @@ #ifndef __CHARSET_H_ #define __CHARSET_H_
+#include <linux/types.h> + #define MAX_UTF8_PER_UTF16 3
/** @@ -62,4 +64,17 @@ uint16_t *utf16_strdup(const uint16_t *s); */ uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size);
+/** + * utf8_to_utf16() - Convert an utf8 string to utf16 + * + * Converts up to 'size' characters of the utf16 string 'src' to utf8 + * written to the 'dest' buffer. Stops at 0x00. + * + * @dest the destination buffer to write the utf8 characters + * @src the source utf16 string + * @size maximum number of utf16 characters to convert + * @return the pointer to the first unwritten byte in 'dest' + */ +uint16_t *utf8_to_utf16(uint16_t *dest, const uint8_t *src, size_t size); + #endif /* __CHARSET_H_ */ diff --git a/lib/charset.c b/lib/charset.c index ff76e88c77..8cd17ea1cb 100644 --- a/lib/charset.c +++ b/lib/charset.c @@ -6,7 +6,6 @@ * SPDX-License-Identifier: GPL-2.0+ */
-#include <common.h> #include <charset.h> #include <malloc.h>
@@ -99,3 +98,59 @@ uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size)
return dest; } + +uint16_t *utf8_to_utf16(uint16_t *dest, const uint8_t *src, size_t size) +{ + while (size--) { + int extension_bytes; + uint32_t code; + + extension_bytes = 0; + if (*src <= 0x7f) { + code = *src++; + /* Exit on zero byte */ + if (!code) + size = 0; + } else if (*src <= 0xbf) { + /* Illegal code */ + code = '?'; + } else if (*src <= 0xdf) { + code = *src++ & 0x1f; + extension_bytes = 1; + } else if (*src <= 0xef) { + code = *src++ & 0x0f; + extension_bytes = 2; + } else if (*src <= 0xf7) { + code = *src++ & 0x07; + extension_bytes = 3; + } else { + /* Illegal code */ + code = '?'; + } + + for (; extension_bytes && size; --size, --extension_bytes) { + if ((*src & 0xc0) == 0x80) { + code <<= 6; + code |= *src++ & 0x3f; + } else { + /* Illegal code */ + code = '?'; + ++src; + --size; + break; + } + } + + if (code < 0x10000) { + *dest++ = code; + } else { + /* + * Simplified expression for + * (((code - 0x10000) >> 10) & 0x3ff) | 0xd800 + */ + *dest++ = (code >> 10) + 0xd7c0; + *dest++ = (code & 0x3ff) | 0xdc00; + } + } + return dest; +}