Provide functions for upper and lower case conversion.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- v3: no change v2: add configuration switch EFI_UNICODE_CAPITALIZATION --- include/charset.h | 16 ++++++++++++++ lib/charset.c | 47 ++++++++++++++++++++++++++++++++++++++++++ lib/efi_loader/Kconfig | 10 +++++++++ 3 files changed, 73 insertions(+)
diff --git a/include/charset.h b/include/charset.h index 90870513ef..686db5a1fe 100644 --- a/include/charset.h +++ b/include/charset.h @@ -142,6 +142,22 @@ int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count); */ #define utf16_utf8_strcpy(d, s) utf16_utf8_strncpy((d), (s), SIZE_MAX)
+/** + * utf_to_lower() - convert a Unicode letter to lower case + * + * @code: letter to convert + * Return: lower case letter or unchanged letter + */ +s32 utf_to_lower(const s32 code); + +/** + * utf_to_upper() - convert a Unicode letter to upper case + * + * @code: letter to convert + * Return: upper case letter or unchanged letter + */ +s32 utf_to_upper(const s32 code); + /** * u16_strlen - count non-zero words * diff --git a/lib/charset.c b/lib/charset.c index 39c8329830..72c808ce64 100644 --- a/lib/charset.c +++ b/lib/charset.c @@ -6,8 +6,18 @@ */
#include <charset.h> +#include <capitalization.h> #include <malloc.h>
+static struct capitalization_table capitalization_table[] = +#ifdef CONFIG_EFI_UNICODE_CAPITALIZATION + UNICODE_CAPITALIZATION_TABLE; +#elif CONFIG_FAT_DEFAULT_CODEPAGE == 1250 + CP1250_CAPITALIZATION_TABLE; +#else + CP437_CAPITALIZATION_TABLE; +#endif + s32 utf8_get(const char **src) { s32 code = 0; @@ -241,6 +251,43 @@ int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count) return 0; }
+s32 utf_to_lower(const s32 code) +{ + struct capitalization_table *pos = capitalization_table; + s32 ret = code; + + if (code <= 0x7f) { + if (code >= 'A' && code <= 'Z') + ret += 0x20; + return ret; + } + for (; pos->upper; ++pos) { + if (pos->upper == code) { + ret = pos->lower; + break; + } + } + return ret; +} + +s32 utf_to_upper(const s32 code) +{ + struct capitalization_table *pos = capitalization_table; + s32 ret = code; + + if (code <= 0x7f) { + if (code >= 'a' && code <= 'z') + ret -= 0x20; + return ret; + } + for (; pos->lower; ++pos) { + if (pos->lower == code) { + ret = pos->upper; + break; + } + } + return ret; +}
size_t u16_strlen(const u16 *in) { diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig index ce6a09f0b4..dbf7339fe0 100644 --- a/lib/efi_loader/Kconfig +++ b/lib/efi_loader/Kconfig @@ -15,6 +15,16 @@ config EFI_LOADER interfaces to a loaded EFI application, enabling it to reuse U-Boot's device drivers.
+config EFI_UNICODE_CAPITALIZATION + bool "Support Unicode capitalization" + depends on EFI_LOADER + default y + help + Select this option to enable correct handling of the capitalization of + Unicode codepoints in the range 0x0000-0xffff. If this option is not + set, only the the correct handling of the letters of the codepage + used by the FAT file system is ensured. + config EFI_LOADER_BOUNCE_BUFFER bool "EFI Applications use bounce buffers for DMA operations" depends on EFI_LOADER && ARM64