1 files changed, 44 insertions, 0 deletions
diff --git a/src/detection/bootmgr/bootmgr.c b/src/detection/bootmgr/bootmgr.c
new file mode 100644
index 0000000..31838d4
--- /dev/null
+++ b/src/detection/bootmgr/bootmgr.c
@@ -0,0 +1,44 @@
+#include "efi_helper.h"
+
+static inline uint8_t evBits(uint16_t val, uint8_t mask, uint8_t shift) {
+    return (uint8_t) ((val & (mask << shift)) >> shift);
+}
+
+static void ffEfiUcs2ToUtf8(const uint16_t* const chars, FFstrbuf* result) {
+    for (uint32_t i = 0; chars[i]; i++) {
+        if (chars[i] <= 0x007f) {
+            ffStrbufAppendC(result, (char) chars[i]);
+        } else if (chars[i] > 0x007f && chars[i] <= 0x07ff) {
+            ffStrbufAppendC(result, (char) (0xc0 | evBits(chars[i], 0x1f, 6)));
+            ffStrbufAppendC(result, (char) (0x80 | evBits(chars[i], 0x3f, 0)));
+        } else {
+            ffStrbufAppendC(result, (char) (0xe0 | evBits(chars[i], 0xf, 12)));
+            ffStrbufAppendC(result, (char) (0x80 | evBits(chars[i], 0x3f, 6)));
+            ffStrbufAppendC(result, (char) (0x80 | evBits(chars[i], 0x3f, 0)));
+        }
+    }
+}
+
+bool ffEfiFillLoadOption(const FFEfiLoadOption* efiOption, FFBootmgrResult* result) {
+    uint32_t descLen = 0;
+    while (efiOption->Description[descLen]) {
+        ++descLen;
+    }
+
+    if (descLen) {
+        ffEfiUcs2ToUtf8(efiOption->Description, &result->name);
+    }
+
+    for (
+        ffEfiDevicePathProtocol* filePathList = (ffEfiDevicePathProtocol*) &efiOption->Description[descLen + 1];
+        filePathList->Type != 0x7F; // End of Hardware Device Path
+        filePathList = (ffEfiDevicePathProtocol*) ((uint8_t*) filePathList + filePathList->Length)) {
+        if (filePathList->Type == 4 && filePathList->SubType == 4) {
+            // https://uefi.org/specs/UEFI/2.10/10_Protocols_Device_Path_Protocol.html#file-path-media-device-path
+            ffEfiUcs2ToUtf8((uint16_t*) filePathList->SpecificDevicePathData, &result->firmware);
+            return true;
+        }
+    }
+
+    return false;
+}