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#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;
}
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