fix: fix build.

src/data_format/_pl/v1_12_0/blob_impl.cpp

@@ -39,15 +39,15 @@ namespace di::data_format::_pl::v1_12_0 {
 void MagicBlobImpl::read(const fs::path& path) {
     StreamedIO::read(path);
 
-    m_stored_seed = eat<uint64_t>();
+    m_stored_seed = get<uint64_t>();
     m_query_seed  = hash_qseed(m_stored_seed);
 
     rva_t n_rva{};
 
-    while (next() != EOF) {
-        auto flags = eat_varint<uint64_t>();
-        auto rva   = eat_varint<rva_t>();
-        auto hash  = eat<hash_t>();
+    while (!is_eof()) {
+        auto flags = get_varint<uint64_t>();
+        auto rva   = get_varint<rva_t>();
+        auto hash  = get<hash_t>();
 
         // What is stored in the original format is not the RVA itself, but the
         // difference with the previous entry (in MagicBlob, RVA is sorted from

src/data_format/_pl/v1_12_0/blob_impl.h

@@ -6,8 +6,7 @@ namespace di::data_format::_pl::v1_12_0 {
 
 class MagicBlobImpl : public MagicBlob {
 public:
-    using for_each_callback_t =
-        std::function<void(hash_t, shared_entry_t const&)>;
+    MagicBlobImpl() = default;
 
     void read(const fs::path& path) override;
 

src/data_format/_pl/v1_13_0/blob_impl.cpp

@@ -0,0 +1,193 @@
+#include "blob_impl.h"
+
+#include "xtea_ll.hpp"
+
+#include "third-party/chacha20.hpp"
+#include "util/aes.h"
+
+namespace {
+
+// clang-format off
+
+constexpr auto BLOB_MAGIC = 0x534442666F0B0E0BuLL;
+constexpr auto BLOB_HEADER_SIZE = 0x14;
+
+constexpr std::array<uint8_t, 16> CHACHA20_MAGIC = { // lldev's ninjutsu.
+    0xE5, 0x93, 0x8E, 0xE6,
+    0x88, 0x91, 0xE8, 0x8D,
+    0x89, 0x52, 0x42, 0x4E,
+    0xE6, 0x80, 0x8E, 0xE4,
+};
+
+constexpr std::array<uint8_t, 32> CHACHA20_KEY = {
+    0xE5, 0x90, 0x93, 0xE6,
+    0x88, 0x91, 0xE4, 0xB8,
+    0x80, 0xE8, 0xB7, 0xB3,
+    0xE9, 0x87, 0x8A, 0xE6,
+    0x94, 0xBE, 0xE5, 0xBF,
+    0x8D, 0xE6, 0x9C, 0xAF,
+    0x61, 0x77, 0x63, 0x7A,
+    0x72, 0x62, 0x6E, 0x00,
+};
+
+constexpr std::array<uint32_t, 4> DATAKEY_PART1_PRECURSOR = {
+    0xE79E8CE7,
+    0xADE5818C,
+    0x9E9BE590,
+    0x0082ADE9,
+};
+
+constexpr std::array<uint8_t, 32> DATAKEY_PART2_PRECURSOR_1 = {
+    0x9C, 0x99, 0x18, 0xB8, 0x74, 0xF1, 0xF8, 0x6B,
+    0x25, 0xAE, 0x87, 0xCE, 0x61, 0x32, 0xA0, 0x0C,
+    0x01, 0xF3, 0x3A, 0x81, 0x5A, 0x16, 0x06, 0x4E,
+    0x93, 0x16, 0xBE, 0xE8, 0xE3, 0xCA, 0x6F, 0xDF,
+};
+
+constexpr std::array<uint8_t, 32> DATAKEY_PART2_PRECURSOR_2 = {
+    0x45, 0xB6, 0x4F, 0xDC, 0xAA, 0x0B, 0x4C, 0x67,
+    0x11, 0x91, 0x3B, 0x75, 0x91, 0x83, 0x98, 0x05,
+    0x77, 0x51, 0x5F, 0xD2, 0x09, 0x37, 0x1B, 0x36,
+    0x0A, 0x77, 0x9B, 0x5E, 0xD6, 0xD9, 0xEE, 0x42,
+};
+
+// clang-format on
+
+} // namespace
+
+/*
+    Magic Blob File Format
+      v1.13.0
+    ---------------------------------------  0x0
+    | (u64) Magic Number                  |
+    ---------------------------------------  0x8
+    | (u32) UNK                           |
+    ---------------------------------------  0xC
+    | (u64) ChaCha20 Nonce                |
+    ---------------------------------------  0x14
+    | ***** ChaCha20 Encrypted Data ***** |
+    ---------------------------------------  EOF
+
+    ChaCha20 Decrypted Data
+    ---------------------------------------  0x14 (before file header)
+    | (u64) UNK                           |
+    ---------------------------------------  0x1c
+    | (u64) AES Encrypted Data Part 1 Len |
+    ---------------------------------------  0x24
+    | (b16) Stored Key Lower 16 Bytes     |
+    ---------------------------------------  0x34
+    | **** AES Encrypted Data Part 1 **** |
+    ---------------------------------------  0x34 + enc_len_p1
+    | (b16) Stored Key Higher 16 Bytes    |
+    ---------------------------------------  0x34 + enc_len_p1 + 0x10
+    | (u64) AES Encrypted Data Part 2 Len |
+    ---------------------------------------  0x34 + enc_len_p1 + 0x18
+    | **** AES Encrypted Data Part 2 **** |
+    ---------------------------------------  EOF
+
+    AES Decrypted Data (Part 1)
+    ---------------------------------------  0x0
+    | (u64) UNK_DATA                      |
+    ---------------------------------------  0x8
+    | ........ (repeat N times) ........  |
+    ---------------------------------------  EOF
+
+    AES Decrypted Data (Part 2)
+    ---------------------------------------  0x0
+    | (u64) UNK_DATA                      |
+    | (u64) Flag                          |
+    ---------------------------------------  0xF
+    | ........ (repeat N times) ........  |
+    ---------------------------------------  EOF
+
+*/
+
+namespace di::data_format::_pl::v1_13_0 {
+
+void MagicBlobImpl::read(const fs::path& path) {
+    StreamedIO::read(path);
+
+    // header
+
+    auto magic          = get<uint64_t>();
+    auto unk_1          = get<uint32_t>();
+    auto chacha20_nonce = get<uint64_t>();
+
+    if (magic != BLOB_MAGIC) {
+        std::println("error!");
+        return;
+    }
+
+    if (unk_1 != 1) {
+        std::println("error!");
+        return;
+    }
+
+    // perform chacha20 decryption
+
+    Chacha20 chacha20(
+        CHACHA20_MAGIC.data(),
+        CHACHA20_KEY.data(),
+        (uint8_t*)&chacha20_nonce,
+        0
+    );
+
+    chacha20.decrypt(
+        reinterpret_cast<uint8_t*>(underlying().data()) + BLOB_HEADER_SIZE,
+        size() - BLOB_HEADER_SIZE
+    );
+
+    // chacha20 decrypted
+
+    XTeaLL::Block data_key;
+
+    auto unk_2              = get<uint64_t>(); // may be signed, L241
+    auto enc_data_part1_len = get<uint64_t>();
+    data_key.parts[0]       = get<uint32_t>(); // L231
+    data_key.parts[1]       = get<uint32_t>();
+    data_key.parts[2]       = get<uint32_t>();
+    data_key.parts[3]       = get<uint32_t>();
+    seek(position() + enc_data_part1_len);
+    data_key.parts[4]       = get<uint32_t>(); // L244
+    data_key.parts[5]       = get<uint32_t>();
+    data_key.parts[6]       = get<uint32_t>();
+    data_key.parts[7]       = get<uint32_t>();
+    auto enc_data_part2_len = get<uint64_t>();
+
+    // perform aes decryption
+
+    auto enc_data_part1_begin = underlying().data() + 0x34;
+    auto enc_data_part2_begin =
+        underlying().data() + 0x34 + enc_data_part1_len + 0x18;
+
+    XTeaLL({
+               DATAKEY_PART1_PRECURSOR[0],
+               DATAKEY_PART1_PRECURSOR[1],
+               DATAKEY_PART1_PRECURSOR[2],
+               DATAKEY_PART1_PRECURSOR[3],
+           })
+        .decrypt(data_key);
+
+    std::array<uint8_t, 32> aes_key_part1;
+    std::memcpy(aes_key_part1.data(), (char*)&data_key.parts, 32);
+
+    std::array<uint8_t, 32> aes_key_part2;
+    for (int i = 0; i < 32; i++) {
+        aes_key_part2[i] = DATAKEY_PART2_PRECURSOR_1[i]
+                         ^ DATAKEY_PART2_PRECURSOR_2[i] ^ aes_key_part1[i];
+    }
+
+    auto data_part1 = AES(aes_key_part1)
+                          .decrypt(
+                              {reinterpret_cast<uint8_t*>(enc_data_part1_begin),
+                               enc_data_part1_len}
+                          );
+
+    auto data_part2 = AES(aes_key_part2)
+                          .decrypt(
+                              {reinterpret_cast<uint8_t*>(enc_data_part2_begin),
+                               enc_data_part2_len}
+                          );
+}
+
+} // namespace di::data_format::_pl::v1_13_0

src/data_format/_pl/v1_13_0/blob_impl.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "data_format/magic_blob.h"
+
+namespace di::data_format::_pl::v1_13_0 {
+
+class MagicBlobImpl : public MagicBlob {
+public:
+    MagicBlobImpl() = default;
+
+    void read(const fs::path& path) override;
+
+    shared_entry_t query(std::string_view symbol) const override {
+        return std::make_shared<MagicEntry>(0, 0);
+    }
+
+    void for_each(const for_each_callback_t& callback) const override {}
+
+    size_t count() const override { return 0; }
+};
+
+} // namespace di::data_format::_pl::v1_13_0

src/data_format/_pl/v1_13_0/xtea_ll.hpp

@@ -0,0 +1,145 @@
+#pragma once
+
+// An xtea variant algorithm.
+// IDX = 11, L247 ~ L400
+
+namespace di::data_format::_pl::v1_13_0 {
+
+class XTeaLL {
+public:
+    struct Block {
+        std::array<uint32_t, 8> parts;
+    };
+    static_assert(sizeof(Block) == 32);
+
+    explicit XTeaLL(const Block& sample) : m_sample(sample) {};
+
+    void decrypt(Block& data) {
+        transform_block_a_v(data.parts[0], data.parts[1]);
+        transform_block_b_v(data.parts[2], data.parts[3]);
+        transform_block_b_i(data.parts[4], data.parts[5]);
+        transform_block_a_i(data.parts[6], data.parts[7]);
+    }
+
+private:
+    using u32 = uint32_t;
+    using u16 = uint16_t;
+    using u8  = uint8_t;
+
+    // ----------------------------------------
+
+    const static u32 delta = 0x9E3779B9;
+
+    const static u32 mask_1 = 0x0000BEEF;
+    const static u32 mask_2 = 0xFFFF4110;
+    const static u32 mask_3 = 0x001FFFFC;
+    const static u32 mask_4 = 0xFFFFFFFC;
+
+    // ----------------------------------------
+
+    Block const& m_sample;
+
+    // ----------------------------------------
+
+    constexpr auto mix32(u32 x) { return x + ((x >> 5) ^ (x << 4)); };
+
+    constexpr auto beef(u32 a, u32 b, u32 c, u32 sum) {
+        return (((u16)a + (u16)b - (u16)c) & mask_1) | (sum & mask_2);
+    };
+
+    constexpr auto idx_a(u32 sum1) {
+        u32 t = (sum1 >> 11);
+        return t & (t ^ mask_3);
+    };
+
+    template <bool Inverse>
+    constexpr auto idx_b(u32 k, u32 s) {
+        if (!Inverse) return ~((u8)k + (u8)s) & 3u;
+        u32 t = k + s;
+        return t & (t ^ mask_4);
+    };
+
+    template <bool Inverse>
+    constexpr auto idx_c(u32 sum1) {
+        if constexpr (!Inverse) return ((sum1 >> 9) & 0xC) / 4;
+        return idx_a(sum1);
+    };
+
+    template <bool Inverse>
+    constexpr auto idx_d(u32 vsum2, u32 vrsum2) {
+        if constexpr (!Inverse) return ~(u8)vrsum2 & 3u;
+        return vsum2 & (vsum2 ^ mask_4);
+    };
+
+    // ----------------------------------------
+
+    template <bool Inverse>
+    constexpr void transform_block_a(u32& v1, u32& v2) {
+        u32 sum1  = delta * 64;
+        u32 sum2  = delta * 63;
+        u32 rsum1 = ~sum1;
+        u32 rsum2 = ~sum2;
+
+        for (int i = 0; i < 64; i++) {
+            u32 s1 = m_sample.parts.at(idx_c<Inverse>(sum1));
+            u32 s2 = m_sample.parts.at(idx_d<Inverse>(sum2, rsum2));
+            if constexpr (!Inverse) {
+                v2 -= mix32(v1) ^ beef(0, rsum1, s1, sum1 + s1) ^ mask_1;
+                v1 -= (sum2 + s2) ^ (mix32(v2) & ((sum2 + s2) ^ (rsum2 - s2)));
+            } else {
+                v2 -= (sum1 + s1) ^ (mix32(v1) & ((sum1 + s1) ^ (rsum1 - s1)));
+                v1 -= mix32(v2) ^ beef(0, rsum2, s2, sum2 + s2) ^ mask_1;
+            }
+            sum1  -= delta;
+            sum2  -= delta;
+            rsum1 += delta;
+            rsum2 += delta;
+        }
+    };
+
+    template <bool Inverse>
+    constexpr void transform_block_b(u32& v1, u32& v2) {
+        const u32 md1  = delta * 64;
+        const u32 md2  = delta * 63;
+        const u32 rmd1 = ~md1;
+        const u32 rmd2 = ~md2;
+
+        u32 sum1 = 0;
+        u32 sum2 = 0;
+
+        for (int i = 0; i < 64; i++) {
+            u32 c1  = md1 + sum2;
+            u32 s1  = m_sample.parts.at(idx_a(c1));
+            v2     -= mix32(v1) ^ beef(sum1, rmd1, s1, s1 + c1) ^ mask_1;
+            if constexpr (!Inverse) {
+                u32 s2 = m_sample.parts.at(idx_b<Inverse>(rmd2, sum1));
+                v1 -=
+                    mix32(v2) ^ beef(rmd2, sum1, s2, s2 + sum2 + md2) ^ mask_1;
+            } else {
+                u32 s2  = m_sample.parts.at(idx_b<Inverse>(md2, sum2));
+                u32 c2  = s2 + md2 + sum2;
+                v1     -= c2 ^ (mix32(v2) & (c2 ^ (sum1 + rmd2 - s2)));
+            }
+            sum1 += delta;
+            sum2 -= delta;
+        }
+    };
+
+    constexpr void transform_block_a_v(u32& v1, u32& v2) {
+        return transform_block_a<false>(v1, v2);
+    }
+
+    constexpr void transform_block_a_i(u32& v1, u32& v2) {
+        return transform_block_a<true>(v1, v2);
+    }
+
+    constexpr void transform_block_b_v(u32& v1, u32& v2) {
+        return transform_block_b<false>(v1, v2);
+    }
+
+    constexpr void transform_block_b_i(u32& v1, u32& v2) {
+        return transform_block_b<true>(v1, v2);
+    }
+};
+
+} // namespace di::data_format::_pl::v1_13_0

src/data_format/magic_blob.cpp

@@ -1,6 +1,7 @@
 #include "data_format/magic_blob.h"
 
 #include "data_format/_pl/v1_12_0/blob_impl.h"
+#include "data_format/_pl/v1_13_0/blob_impl.h"
 
 namespace di::data_format {
 
@@ -8,6 +9,8 @@ MagicBlob::blob_t MagicBlob::create(FormatVersion version) {
     switch (version) {
     case V1_12_0:
         return std::make_unique<_pl::v1_12_0::MagicBlobImpl>();
+    case V1_13_0:
+        return std::make_unique<_pl::v1_13_0::MagicBlobImpl>();
     }
     return nullptr;
 }

src/data_format/magic_blob.h

@@ -9,6 +9,7 @@ class MagicBlob : public io::StreamedIO {
 public:
     enum FormatVersion {
         V1_12_0,
+        V1_13_0,
     };
 
     using blob_t  = std::unique_ptr<MagicBlob>;

src/data_format/type/decl_type.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "util/string.h"
+#include <magic_enum.hpp>
 
 namespace di {
 
@@ -26,33 +26,11 @@ public:
 
     constexpr DeclType(Enum value) : m_data(value) {}
     constexpr explicit DeclType(std::string_view str) {
-        using namespace util::string;
-
-        // clang-format off
-            
-        switch (H(str)) {
-    #define HSTR(x)                                                                                                        \
-        case H(#x):                                                                                                        \
-            m_data = x;                                                                                                    \
-            break
-        HSTR(Function);
-        HSTR(CXXDeductionGuide);
-        HSTR(CXXMethod);
-        HSTR(CXXConstructor);
-        HSTR(CXXConversion);
-        HSTR(CXXDestructor);
-        HSTR(Var);
-        HSTR(Decomposition);
-        HSTR(ImplicitParam);
-        HSTR(OMPCapturedExpr);
-        HSTR(ParamVar);
-        HSTR(VarTemplateSpecialization);
-    #undef HSTR
-        default:
-            throw ConvertEnumException(str, TypeOnly<Enum>{});
+        if (auto value = magic_enum::enum_cast<Enum>(str)) {
+            m_data = *value;
+        } else {
+            throw EnumCastException(str, TypeOnly<Enum>{});
         }
-
-        // clang-format on
     }
 
     constexpr bool is_function() const {
@@ -65,32 +43,12 @@ public:
     constexpr Enum data() const { return m_data; }
 
     constexpr std::string string() const {
-        using namespace util::string;
-
-        // clang-format off
-
-        switch (m_data) {
-    #define HSTR(x)                                                                \
-        case x:                                                                    \
-            return #x;
-        HSTR(Function);
-        HSTR(CXXDeductionGuide);
-        HSTR(CXXMethod);
-        HSTR(CXXConstructor);
-        HSTR(CXXConversion);
-        HSTR(CXXDestructor);
-        HSTR(Var);
-        HSTR(Decomposition);
-        HSTR(ImplicitParam);
-        HSTR(OMPCapturedExpr);
-        HSTR(ParamVar);
-        HSTR(VarTemplateSpecialization);
-    #undef HSTR
-        default:
-            throw ConvertEnumException(m_data);
+        auto value = magic_enum::enum_name(m_data);
+        if (value.empty()) {
+            throw EnumCastException(m_data);
         }
 
-        // clang-format on
+        return std::string(value);
     }
 
     constexpr bool operator==(const DeclType& other) const {

src/error.h

@@ -107,13 +107,12 @@ public:
     constexpr std::string category() const { return "exception.unix"; }
 };
 
-class ConvertEnumException : public RuntimeException<ConvertEnumException> {
+class EnumCastException : public RuntimeException<EnumCastException> {
 public:
-    // TODO: compile-time reflection.
     // TODO: remove helper.
 
     template <Enumerate T>
-    explicit ConvertEnumException(T enum_val)
+    explicit EnumCastException(T enum_val)
     : RuntimeException("Unable to convert string to enumeration value because "
                        "input value is bad.") {
         add_context("enum_type", typeid(T).name());
@@ -121,14 +120,14 @@ public:
     }
 
     template <typename T>
-    explicit ConvertEnumException(std::string_view enum_str, TypeOnly<T>)
+    explicit EnumCastException(std::string_view enum_str, TypeOnly<T>)
     : RuntimeException("Unable to convert enumeration value to string because "
                        "input value is bad.") {
         add_context("enum_type", typeid(T).name());
         add_context("string", enum_str);
     }
 
-    constexpr std::string category() const { return "exception.enumconvert"; }
+    constexpr std::string category() const { return "exception.magicenum"; }
 };
 
 } // namespace di

src/io/io_base.h

@@ -17,6 +17,30 @@ public:
     constexpr std::string category() const { return "exception.io"; }
 };
 
+class OutOfBoundException : public IOException {
+public:
+    explicit OutOfBoundException(size_t op, size_t buffer_size)
+    : IOException("An attempt was made to move the read pointer outside the "
+                  "buffer bounds.") {
+        add_context_v_hex("op", op);
+        add_context_v_hex("buffer_size", buffer_size);
+    }
+
+    constexpr std::string category() const { return "exception.io.outofbound"; }
+};
+
+class CorruptedVarIntException : public IOException {
+public:
+    explicit CorruptedVarIntException(std::string_view msg, size_t position)
+    : IOException("{}", msg) {
+        add_context_v_hex("position", position);
+    }
+
+    constexpr std::string category() const {
+        return "exception.io.corruptedvarint";
+    }
+};
+
 class UnableToOpenException : public UnixException {
 public:
     explicit UnableToOpenException(const fs::path& path) {

src/io/streamed_io.cpp

@@ -3,13 +3,39 @@
 namespace di::io {
 
 void StreamedIO::read(const fs::path& path) {
-    m_file_stream.open(path, std::ios::binary);
-    if (!m_file_stream) throw UnableToOpenException(path);
+    std::ifstream file(path, std::ios::binary | std::ios::ate);
+    if (!file) {
+        throw UnableToOpenException(path);
+    }
+
+    auto size = static_cast<size_t>(file.tellg());
+    file.seekg(0, std::ios::beg);
+
+    m_buffer.resize(size);
+    if (!file.read(m_buffer.data(), size)) {
+        throw IOException(
+            "Failed to read {} bytes from {}.",
+            size,
+            path.string()
+        );
+    }
+
+    m_position = 0; // reset
 }
 
 void StreamedIO::write(const fs::path& path) const {
-    std::fstream ofs(path, std::ios::binary);
-    ofs << m_file_stream.rdbuf();
+    std::ofstream file(path, std::ios::binary | std::ios::trunc);
+    if (!file) {
+        throw UnableToOpenException(path);
+    }
+
+    if (!file.write(m_buffer.data(), m_buffer.size())) {
+        throw IOException(
+            "Failed to write {} bytes to {}.",
+            m_buffer.size(),
+            path.string()
+        );
+    }
 }
 
 } // namespace di::io

src/io/streamed_io.h

@@ -6,38 +6,109 @@ namespace di::io {
 
 class StreamedIO : public io::IOBase {
 public:
+    explicit StreamedIO(std::string data) : m_buffer(std::move(data)) {}
+    explicit StreamedIO(const fs::path& path) { read(path); }
+
+    StreamedIO() = default;
+
     void read(const fs::path& path) override;
     void write(const fs::path& path) const override;
 
-    constexpr auto next() { return m_file_stream.peek(); }
-
-    // Avoid confusion with the function that opens a file, so use eat
-    // instead of read. Maybe come up with another name for write as well.
-    //
-    // TODO: write<T>() method.
-
-    template <typename T>
-    constexpr T eat() {
+    template <TriviallyCopyable T>
+    constexpr T get() {
+        if (m_position + sizeof(T) > m_buffer.size()) {
+            throw OutOfBoundException(sizeof(T), m_buffer.size());
+        }
         T value;
-        m_file_stream.read((char*)&value, sizeof(T));
-        return value;
+
+        // To avoid violating the strict aliasing rule, so we use memcpy.
+        std::memcpy(&value, m_buffer.data() + m_position, sizeof(T));
+        m_position += sizeof(T);
+
+        if constexpr (std::endian::native != std::endian::little) {
+            return std::byteswap(value);
+        } else {
+            return value;
+        }
     }
 
     template <std::unsigned_integral T>
-    constexpr T eat_varint() {
-        T   res   = 0;
-        int shift = 0;
+    constexpr T get_varint() {
+        T res = 0;
+
+        int       shift     = 0;
+        const int max_shift = sizeof(T) * 8;
+
         while (true) {
-            auto byte  = m_file_stream.get();
-            res       |= static_cast<T>(byte & 0x7F) << shift;
-            if ((byte & 0x80) == 0) break;
+            if (m_position >= m_buffer.size()) {
+                throw CorruptedVarIntException(
+                    "Incomplete VarInt at end of buffer.",
+                    m_position
+                );
+            }
+            if (shift >= max_shift) {
+                throw CorruptedVarIntException(
+                    "VarInt is too long for the requested type.",
+                    m_position
+                );
+            }
+
+            auto byte  = static_cast<std::byte>(m_buffer[m_position++]);
+            res       |= static_cast<T>(byte & std::byte{0x7F}) << shift;
+
+            if ((byte & std::byte{0x80}) == std::byte{0}) {
+                break;
+            }
+
             shift += 7;
         }
         return res;
     }
 
+    template <TriviallyCopyable T>
+    constexpr void put(T value) {
+        if constexpr (std::endian::native != std::endian::little) {
+            value = std::byteswap(value);
+        }
+
+        auto data = reinterpret_cast<const char*>(&value);
+        if (m_position + sizeof(T) > m_buffer.size()) {
+            m_buffer.append(data, sizeof(T));
+        } else {
+            std::memcpy(m_buffer.data() + m_position, data, sizeof(T));
+        }
+
+        m_position += sizeof(T);
+    }
+
+    template <std::unsigned_integral T>
+    constexpr void put_varint(T value) {
+        while (value >= 0x80) {
+            std::byte to_write = static_cast<std::byte>((value & 0x7F) | 0x80);
+            put(static_cast<char>(to_write));
+            value >>= 7;
+        }
+        put(static_cast<char>(value));
+    }
+
+    constexpr void seek(size_t pos) {
+        if (pos > m_buffer.size()) {
+            throw OutOfBoundException(pos, m_buffer.size());
+        }
+        m_position = pos;
+    }
+
+    size_t size() const { return m_buffer.size(); }
+
+    bool is_eof() const { return m_position >= m_buffer.size(); }
+
+    constexpr size_t position() const { return m_position; }
+
+    std::string& underlying() { return m_buffer; }
+
 private:
-    std::ifstream m_file_stream;
+    std::string m_buffer;
+    size_t      m_position;
 };
 
 } // namespace di::io

src/nonstd.h

@@ -13,6 +13,9 @@ constexpr auto underlying_value(T v) {
     return static_cast<std::underlying_type_t<decltype(v)>>(v);
 }
 
+template <typename T>
+concept TriviallyCopyable = std::is_trivially_copyable_v<T>;
+
 #if __cpp_constexpr >= 202211L // complete c++23 constexpr
 #define DI_CONSTEXPR constexpr
 #else

src/pch.h

@@ -16,7 +16,10 @@ using namespace llvm;
 #include <functional>
 #include <memory>
 
+#include <bit>
+
 #include <cstring>
+#include <span>
 #include <string>
 #include <string_view>
 

src/third-party/chacha20.hpp

@@ -0,0 +1,164 @@
+#pragma once
+
+// --------------------------------------------------
+// From: https://github.com/983/ChaCha20 (Unlicense)
+// Modified to support custom magic constants.
+// --------------------------------------------------
+
+// This is high quality software because the includes are sorted alphabetically.
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+
+struct Chacha20Block {
+    // This is basically a random number generator seeded with key and nonce.
+    // Generates 64 random bytes every time count is incremented.
+
+    uint32_t state[16];
+
+    static uint32_t rotl32(uint32_t x, int n) {
+        return (x << n) | (x >> (32 - n));
+    }
+
+    static uint32_t pack4(const uint8_t* a) {
+        return uint32_t(a[0] << 0 * 8) | uint32_t(a[1] << 1 * 8)
+             | uint32_t(a[2] << 2 * 8) | uint32_t(a[3] << 3 * 8);
+    }
+
+    static void unpack4(uint32_t src, uint8_t* dst) {
+        dst[0] = (src >> 0 * 8) & 0xff;
+        dst[1] = (src >> 1 * 8) & 0xff;
+        dst[2] = (src >> 2 * 8) & 0xff;
+        dst[3] = (src >> 3 * 8) & 0xff;
+    }
+
+    Chacha20Block(const uint8_t key[32], const uint8_t nonce[8])
+    : Chacha20Block((uint8_t*)"expand 32-byte k", key, nonce) {}
+
+    Chacha20Block(
+        const uint8_t magic[16],
+        const uint8_t key[32],
+        const uint8_t nonce[8]
+    ) {
+        state[0]  = pack4(magic + 0 * 4);
+        state[1]  = pack4(magic + 1 * 4);
+        state[2]  = pack4(magic + 2 * 4);
+        state[3]  = pack4(magic + 3 * 4);
+        state[4]  = pack4(key + 0 * 4);
+        state[5]  = pack4(key + 1 * 4);
+        state[6]  = pack4(key + 2 * 4);
+        state[7]  = pack4(key + 3 * 4);
+        state[8]  = pack4(key + 4 * 4);
+        state[9]  = pack4(key + 5 * 4);
+        state[10] = pack4(key + 6 * 4);
+        state[11] = pack4(key + 7 * 4);
+        // 64 bit counter initialized to zero by default.
+        state[12] = 0;
+        state[13] = 0;
+        state[14] = pack4(nonce + 0 * 4);
+        state[15] = pack4(nonce + 1 * 4);
+    }
+
+    void set_counter(uint64_t counter) {
+        // Want to process many blocks in parallel?
+        // No problem! Just set the counter to the block you want to process.
+        state[12] = uint32_t(counter);
+        state[13] = counter >> 32;
+    }
+
+    void next(uint32_t result[16]) {
+        // This is where the crazy voodoo magic happens.
+        // Mix the bytes a lot and hope that nobody finds out how to undo it.
+        for (int i = 0; i < 16; i++) result[i] = state[i];
+
+#define CHACHA20_QUARTERROUND(x, a, b, c, d)                                   \
+    x[a] += x[b];                                                              \
+    x[d]  = rotl32(x[d] ^ x[a], 16);                                           \
+    x[c] += x[d];                                                              \
+    x[b]  = rotl32(x[b] ^ x[c], 12);                                           \
+    x[a] += x[b];                                                              \
+    x[d]  = rotl32(x[d] ^ x[a], 8);                                            \
+    x[c] += x[d];                                                              \
+    x[b]  = rotl32(x[b] ^ x[c], 7);
+
+        for (int i = 0; i < 10; i++) {
+            CHACHA20_QUARTERROUND(result, 0, 4, 8, 12)
+            CHACHA20_QUARTERROUND(result, 1, 5, 9, 13)
+            CHACHA20_QUARTERROUND(result, 2, 6, 10, 14)
+            CHACHA20_QUARTERROUND(result, 3, 7, 11, 15)
+            CHACHA20_QUARTERROUND(result, 0, 5, 10, 15)
+            CHACHA20_QUARTERROUND(result, 1, 6, 11, 12)
+            CHACHA20_QUARTERROUND(result, 2, 7, 8, 13)
+            CHACHA20_QUARTERROUND(result, 3, 4, 9, 14)
+        }
+#undef CHACHA20_QUARTERROUND
+
+        for (int i = 0; i < 16; i++) result[i] += state[i];
+
+        uint32_t* counter = state + 12;
+        // increment counter
+        counter[0]++;
+        if (0 == counter[0]) {
+            // wrap around occured, increment higher 32 bits of counter
+            counter[1]++;
+            // Limited to 2^64 blocks of 64 bytes each.
+            // If you want to process more than 1180591620717411303424 bytes
+            // you have other problems.
+            // We could keep counting with counter[2] and counter[3] (nonce),
+            // but then we risk reusing the nonce which is very bad.
+            assert(0 != counter[1]);
+        }
+    }
+
+    void next(uint8_t result8[64]) {
+        uint32_t temp32[16];
+
+        next(temp32);
+
+        for (size_t i = 0; i < 16; i++) unpack4(temp32[i], result8 + i * 4);
+    }
+};
+
+struct Chacha20 {
+    // XORs plaintext/encrypted bytes with whatever Chacha20Block generates.
+    // Encryption and decryption are the same operation.
+    // Chacha20Blocks can be skipped, so this can be done in parallel.
+    // If keys are reused, messages can be decrypted.
+    // Known encrypted text with known position can be tampered with.
+    // See https://en.wikipedia.org/wiki/Stream_cipher_attack
+
+    Chacha20Block block;
+    uint8_t       keystream8[64];
+    size_t        position;
+
+    Chacha20(
+        const uint8_t magic[16],
+        const uint8_t key[32],
+        const uint8_t nonce[8],
+        uint64_t      counter
+    )
+    : block(magic, key, nonce),
+      position(64) {
+        block.set_counter(counter);
+    }
+
+    Chacha20(const uint8_t key[32], const uint8_t nonce[8], uint64_t counter)
+    : block(key, nonce),
+      position(64) {
+        block.set_counter(counter);
+    }
+
+    void crypt(uint8_t* bytes, size_t n_bytes) {
+        for (size_t i = 0; i < n_bytes; i++) {
+            if (position >= 64) {
+                block.next(keystream8);
+                position = 0;
+            }
+            bytes[i] ^= keystream8[position];
+            position++;
+        }
+    }
+
+    // Just an alias.
+    void decrypt(uint8_t* bytes, size_t n_bytes) { crypt(bytes, n_bytes); }
+};

src/util/aes.cpp

@@ -0,0 +1,84 @@
+#include "aes.h"
+
+#include <openssl/err.h>
+#include <openssl/evp.h>
+
+namespace di {
+
+void handle_openssl_errors() {
+    std::string   str;
+    unsigned long code;
+    while ((code = ERR_get_error()) != 0) {
+        char buffer[256];
+        ERR_error_string_n(code, buffer, sizeof(buffer));
+        str += std::string(buffer) + "\n";
+    }
+    if (str.empty()) str = "Unknown error.";
+    throw OpenSSLException("{}", str);
+}
+
+AES::AES(const std::span<uint8_t>& key) : m_ctx(nullptr) {
+    m_ctx = EVP_CIPHER_CTX_new();
+    if (!m_ctx) {
+        handle_openssl_errors();
+    }
+
+    const EVP_CIPHER* cipher_type = nullptr;
+    switch (key.size()) {
+    case 16: // AES-128
+        cipher_type = EVP_aes_128_ecb();
+        break;
+    case 24: // AES-192
+        cipher_type = EVP_aes_192_ecb();
+        break;
+    case 32: // AES-256
+        cipher_type = EVP_aes_256_ecb();
+        break;
+    default:
+        EVP_CIPHER_CTX_free(m_ctx);
+        throw OpenSSLException("Invalid key size. Must be 16/24/32 bytes.");
+    }
+
+    if (EVP_DecryptInit_ex(m_ctx, cipher_type, nullptr, key.data(), nullptr)
+        != 1) {
+        EVP_CIPHER_CTX_free(m_ctx);
+        handle_openssl_errors();
+    }
+}
+
+AES::~AES() {
+    if (m_ctx) {
+        EVP_CIPHER_CTX_free(m_ctx);
+    }
+}
+
+std::vector<uint8_t> AES::decrypt(const std::span<uint8_t>& ciphertext) {
+    if (ciphertext.empty()) {
+        return {};
+    }
+
+    std::vector<uint8_t> plaintext(ciphertext.size());
+    int                  len = 0;
+
+    if (EVP_DecryptUpdate(
+            m_ctx,
+            plaintext.data(),
+            &len,
+            ciphertext.data(),
+            ciphertext.size()
+        )
+        != 1) {
+        handle_openssl_errors();
+    }
+    int plaintext_len = len;
+
+    if (EVP_DecryptFinal_ex(m_ctx, plaintext.data() + len, &len) != 1) {
+        handle_openssl_errors();
+    }
+    plaintext_len += len;
+
+    plaintext.resize(plaintext_len);
+    return plaintext;
+}
+
+} // namespace di

src/util/aes.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <openssl/types.h>
+
+namespace di {
+
+class AES {
+public:
+    explicit AES(const std::span<uint8_t>& key);
+
+    ~AES();
+
+    AES(const AES&)            = delete;
+    AES(AES&&)                 = delete;
+    AES& operator=(const AES&) = delete;
+    AES& operator=(AES&&)      = delete;
+
+    std::vector<uint8_t> decrypt(const std::span<uint8_t>& ciphertext);
+
+private:
+    EVP_CIPHER_CTX* m_ctx;
+};
+
+class OpenSSLException : public RuntimeException<OpenSSLException> {
+public:
+    using RuntimeException::RuntimeException;
+
+    constexpr std::string category() const { return "exception.ossl"; }
+};
+
+} // namespace di

xmake.lua

@@ -5,6 +5,7 @@ add_requires('nlohmann_json 3.12.0')
 add_requires('xxhash        0.8.3')
 add_requires('libllvm       19.1.7')
 add_requires('magic_enum    0.9.7')
+add_requires('openssl3      3.5.1')
 add_requires('boost         1.88.0', {
     system = false, 
     configs = {
@@ -26,11 +27,21 @@ option('symbol-resolver')
         if option:value() == 'native' and not is_plat('windows') then 
             raise('the native symbol resolver does not support this platform.')
         end
+
+        -- TODO: remove it.
+        --   The native symbol resolver is completely unavailable,
+        --   v1.12.0 Problem: RVA not subtracted from ImageBase.
+        --   v1.13.0 Problem: pl_resolve_symbol does not return the real function address, and needs to handle thunk.
+        if option:value() == 'native' then
+            raise('sorry use builtin symbol resolver please.')
+        end
     end)
 option_end()
 
 if is_config('symbol-resolver', 'native') then
-    add_repositories("liteldev-free-repo https://github.com/liteldev-free/xmake-repo.git")
+    add_repositories('liteldev-free-repo https://github.com/liteldev-free/xmake-repo.git')
+
+    -- TODO: need to add an option to select the PreLoader version.
     add_requires('preloader 1.13.0')
 end
 
@@ -62,6 +73,8 @@ target('libdi')
         'libllvm',
         'boost',
         'nlohmann_json',
+        'openssl3',
+        'magic_enum',
         {public = true}
     )
 
@@ -98,10 +111,7 @@ target('askrva')
     set_pcxxheader('src/pch.h')
 
     add_deps('libdi')
-    add_packages(
-        'argparse',
-        'magic_enum'
-    )
+    add_packages('argparse')
 
     if is_config('symbol-resolver', 'native') then
         add_packages('preloader')
@@ -116,8 +126,7 @@ target('blob-extractor')
     add_deps('libdi')
     add_packages(
         'argparse',
-        'nlohmann_json',
-        'magic_enum'
+        'nlohmann_json'
     )
 
 target('dumpsym')