file_sys: Add support for parsing NPDM files

3 files changed, 276 insertions, 0 deletions

diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index ec011787e..1bc536075 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -12,6 +12,8 @@ add_library(core STATIC
     file_sys/filesystem.h
     file_sys/path_parser.cpp
     file_sys/path_parser.h
+    file_sys/program_metadata.cpp
+    file_sys/program_metadata.h
     file_sys/romfs_factory.cpp
     file_sys/romfs_factory.h
     file_sys/romfs_filesystem.cpp
diff --git a/src/core/file_sys/program_metadata.cpp b/src/core/file_sys/program_metadata.cpp
new file mode 100644
index 000000000..041617bb5
--- /dev/null
+++ b/src/core/file_sys/program_metadata.cpp
@@ -0,0 +1,117 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cinttypes>
+#include "common/file_util.h"
+#include "common/logging/log.h"
+#include "core/file_sys/program_metadata.h"
+#include "core/loader/loader.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+Loader::ResultStatus ProgramMetadata::Load(const std::string& file_path) {
+    FileUtil::IOFile file(file_path, "rb");
+    if (!file.IsOpen())
+        return Loader::ResultStatus::Error;
+
+    std::vector<u8> file_data(file.GetSize());
+
+    if (!file.ReadBytes(file_data.data(), file_data.size()))
+        return Loader::ResultStatus::Error;
+
+    Loader::ResultStatus result = Load(file_data);
+    if (result != Loader::ResultStatus::Success)
+        LOG_ERROR(Service_FS, "Failed to load NPDM from file %s!", file_path.c_str());
+
+    return result;
+}
+
+Loader::ResultStatus ProgramMetadata::Load(const std::vector<u8> file_data, size_t offset) {
+    size_t total_size = static_cast<size_t>(file_data.size() - offset);
+    if (total_size < sizeof(Header))
+        return Loader::ResultStatus::Error;
+
+    size_t header_offset = offset;
+    memcpy(&npdm_header, &file_data[offset], sizeof(Header));
+
+    size_t aci_offset = header_offset + npdm_header.aci_offset;
+    size_t acid_offset = header_offset + npdm_header.acid_offset;
+    memcpy(&aci_header, &file_data[aci_offset], sizeof(AciHeader));
+    memcpy(&acid_header, &file_data[acid_offset], sizeof(AcidHeader));
+
+    size_t fac_offset = acid_offset + acid_header.fac_offset;
+    size_t fah_offset = aci_offset + aci_header.fah_offset;
+    memcpy(&acid_file_access, &file_data[fac_offset], sizeof(FileAccessControl));
+    memcpy(&aci_file_access, &file_data[fah_offset], sizeof(FileAccessHeader));
+
+    return Loader::ResultStatus::Success;
+}
+
+bool ProgramMetadata::Is64BitProgram() const {
+    return npdm_header.has_64_bit_instructions;
+}
+
+ProgramAddressSpaceType ProgramMetadata::GetAddressSpaceType() const {
+    return npdm_header.address_space_type;
+}
+
+u8 ProgramMetadata::GetMainThreadPriority() const {
+    return npdm_header.main_thread_priority;
+}
+
+u8 ProgramMetadata::GetMainThreadCore() const {
+    return npdm_header.main_thread_cpu;
+}
+
+u32 ProgramMetadata::GetMainThreadStackSize() const {
+    return npdm_header.main_stack_size;
+}
+
+u64 ProgramMetadata::GetTitleID() const {
+    return aci_header.title_id;
+}
+
+u64 ProgramMetadata::GetFilesystemPermissions() const {
+    return aci_file_access.permissions;
+}
+
+void ProgramMetadata::Print() const {
+    LOG_DEBUG(Service_FS, "Magic:                  %.4s", npdm_header.magic.data());
+    LOG_DEBUG(Service_FS, "Main thread priority:   0x%02x", npdm_header.main_thread_priority);
+    LOG_DEBUG(Service_FS, "Main thread core:       %u", npdm_header.main_thread_cpu);
+    LOG_DEBUG(Service_FS, "Main thread stack size: 0x%x bytes", npdm_header.main_stack_size);
+    LOG_DEBUG(Service_FS, "Process category:       %u", npdm_header.process_category);
+    LOG_DEBUG(Service_FS, "Flags:                  %02x", npdm_header.flags);
+    LOG_DEBUG(Service_FS, " > 64-bit instructions: %s",
+              npdm_header.has_64_bit_instructions ? "YES" : "NO");
+
+    auto address_space = "Unknown";
+    switch (npdm_header.address_space_type) {
+    case ProgramAddressSpaceType::Is64Bit:
+        address_space = "64-bit";
+        break;
+    case ProgramAddressSpaceType::Is32Bit:
+        address_space = "32-bit";
+        break;
+    }
+
+    LOG_DEBUG(Service_FS, " > Address space:       %s\n", address_space);
+
+    // Begin ACID printing (potential perms, signed)
+    LOG_DEBUG(Service_FS, "Magic:                  %.4s", acid_header.magic.data());
+    LOG_DEBUG(Service_FS, "Flags:                  %02x", acid_header.flags);
+    LOG_DEBUG(Service_FS, " > Is Retail:           %s", acid_header.is_retail ? "YES" : "NO");
+    LOG_DEBUG(Service_FS, "Title ID Min:           %016" PRIX64, acid_header.title_id_min);
+    LOG_DEBUG(Service_FS, "Title ID Max:           %016" PRIX64, acid_header.title_id_max);
+    LOG_DEBUG(Service_FS, "Filesystem Access:      %016" PRIX64 "\n", acid_file_access.permissions);
+
+    // Begin ACI0 printing (actual perms, unsigned)
+    LOG_DEBUG(Service_FS, "Magic:                  %.4s", aci_header.magic.data());
+    LOG_DEBUG(Service_FS, "Title ID:               %016" PRIX64, aci_header.title_id);
+    LOG_DEBUG(Service_FS, "Filesystem Access:      %016" PRIX64 "\n", aci_file_access.permissions);
+}
+} // namespace FileSys
diff --git a/src/core/file_sys/program_metadata.h b/src/core/file_sys/program_metadata.h
new file mode 100644
index 000000000..4e04a8e68
--- /dev/null
+++ b/src/core/file_sys/program_metadata.h
@@ -0,0 +1,157 @@
+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <string>
+#include <vector>
+#include "common/bit_field.h"
+#include "common/common_types.h"
+#include "common/swap.h"
+
+namespace Loader {
+enum class ResultStatus;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// FileSys namespace
+
+namespace FileSys {
+
+enum class ProgramAddressSpaceType : u8 {
+    Is64Bit = 1,
+    Is32Bit = 2,
+};
+
+enum class ProgramFilePermission : u64 {
+    MountContent = 1ULL << 0,
+    SaveDataBackup = 1ULL << 5,
+    SdCard = 1ULL << 21,
+    Calibration = 1ULL << 34,
+    Bit62 = 1ULL << 62,
+    Everything = 1ULL << 63,
+};
+
+/**
+ * Helper which implements an interface to parse Program Description Metadata (NPDM)
+ * Data can either be loaded from a file path or with data and an offset into it.
+ */
+class ProgramMetadata {
+public:
+    Loader::ResultStatus Load(const std::string& file_path);
+    Loader::ResultStatus Load(const std::vector<u8> file_data, size_t offset = 0);
+
+    bool Is64BitProgram() const;
+    ProgramAddressSpaceType GetAddressSpaceType() const;
+    u8 GetMainThreadPriority() const;
+    u8 GetMainThreadCore() const;
+    u32 GetMainThreadStackSize() const;
+    u64 GetTitleID() const;
+    u64 GetFilesystemPermissions() const;
+
+    void Print() const;
+
+private:
+    struct Header {
+        std::array<char, 4> magic;
+        std::array<u8, 8> reserved;
+        union {
+            u8 flags;
+
+            BitField<0, 1, u8> has_64_bit_instructions;
+            BitField<1, 3, ProgramAddressSpaceType> address_space_type;
+            BitField<4, 4, u8> reserved_2;
+        };
+        u8 reserved_3;
+        u8 main_thread_priority;
+        u8 main_thread_cpu;
+        std::array<u8, 8> reserved_4;
+        u32_le process_category;
+        u32_le main_stack_size;
+        std::array<u8, 0x10> application_name;
+        std::array<u8, 0x40> reserved_5;
+        u32_le aci_offset;
+        u32_le aci_size;
+        u32_le acid_offset;
+        u32_le acid_size;
+    };
+
+    static_assert(sizeof(Header) == 0x80, "NPDM header structure size is wrong");
+
+    struct AcidHeader {
+        std::array<u8, 0x100> signature;
+        std::array<u8, 0x100> nca_modulus;
+        std::array<char, 4> magic;
+        u32_le nca_size;
+        std::array<u8, 0x4> reserved;
+        union {
+            u32 flags;
+
+            BitField<0, 1, u32> is_retail;
+            BitField<1, 31, u32> flags_unk;
+        };
+        u64_le title_id_min;
+        u64_le title_id_max;
+        u32_le fac_offset;
+        u32_le fac_size;
+        u32_le sac_offset;
+        u32_le sac_size;
+        u32_le kac_offset;
+        u32_le kac_size;
+        std::array<u8, 0x8> padding;
+    };
+
+    static_assert(sizeof(AcidHeader) == 0x240, "ACID header structure size is wrong");
+
+    struct AciHeader {
+        std::array<char, 4> magic;
+        std::array<u8, 0xC> reserved;
+        u64_le title_id;
+        std::array<u8, 0x8> padding;
+        u32_le fah_offset;
+        u32_le fah_size;
+        u32_le sac_offset;
+        u32_le sac_size;
+        u32_le kac_offset;
+        u32_le kac_size;
+        std::array<u8, 0x8> padding_2;
+    };
+
+    static_assert(sizeof(AciHeader) == 0x40, "ACI0 header structure size is wrong");
+
+#pragma pack(push, 1)
+
+    struct FileAccessControl {
+        u8 version;
+        std::array<u8, 3> padding;
+        u64_le permissions;
+        std::array<u8, 0x20> unknown;
+    };
+
+    static_assert(sizeof(FileAccessControl) == 0x2C, "FS access control structure size is wrong");
+
+    struct FileAccessHeader {
+        u8 version;
+        std::array<u8, 3> padding;
+        u64_le permissions;
+        u32_le unk_offset;
+        u32_le unk_size;
+        u32_le unk_offset_2;
+        u32_le unk_size_2;
+    };
+
+    static_assert(sizeof(FileAccessHeader) == 0x1C, "FS access header structure size is wrong");
+
+#pragma pack(pop)
+
+    Header npdm_header;
+    AciHeader aci_header;
+    AcidHeader acid_header;
+
+    FileAccessControl acid_file_access;
+    FileAccessHeader aci_file_access;
+};
+
+} // namespace FileSys