Provide functions for upper and lower case conversion.
Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
---
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
--
2.18.0
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