Use std::u16string for conversion between UTF-8 and UTF-16, FS:USER functions

5 files changed, 254 insertions, 189 deletions

diff --git a/src/common/string_util.cpp b/src/common/string_util.cpp
index 61f0939c..54943d30 100644
--- a/src/common/string_util.cpp
+++ b/src/common/string_util.cpp
@@ -9,6 +9,7 @@
 
 #ifdef _WIN32
     #include <Windows.h>
+    #include <codecvt>
 #else
     #include <iconv.h>
 #endif
@@ -411,7 +412,19 @@ std::string UriEncode(const std::string & sSrc)
 
 #ifdef _WIN32
 
-std::string UTF16ToUTF8(const std::wstring& input)
+std::string UTF16ToUTF8(const std::u16string& input)
+{
+    std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
+    return convert.to_bytes(input);
+}
+
+std::u16string UTF8ToUTF16(const std::string& input)
+{
+    std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
+    return convert.from_bytes(input);
+}
+
+static std::string UTF16ToUTF8(const std::wstring& input)
 {
     auto const size = WideCharToMultiByte(CP_UTF8, 0, input.data(), input.size(), nullptr, 0, nullptr, nullptr);
 
@@ -424,7 +437,7 @@ std::string UTF16ToUTF8(const std::wstring& input)
     return output;
 }
 
-std::wstring CPToUTF16(u32 code_page, const std::string& input)
+static std::wstring CPToUTF16(u32 code_page, const std::string& input)
 {
     auto const size = MultiByteToWideChar(code_page, 0, input.data(), input.size(), nullptr, 0);
 
@@ -437,7 +450,7 @@ std::wstring CPToUTF16(u32 code_page, const std::string& input)
     return output;
 }
 
-std::wstring UTF8ToUTF16(const std::string& input)
+std::wstring UTF8ToUTF16W(const std::string &input)
 {
     return CPToUTF16(CP_UTF8, input);
 }
@@ -455,61 +468,123 @@ std::string CP1252ToUTF8(const std::string& input)
 #else
 
 template <typename T>
-std::string CodeToUTF8(const char* fromcode, const std::basic_string<T>& input)
+static std::string CodeToUTF8(const char* fromcode, const std::basic_string<T>& input)
 {
     std::string result;
 
     iconv_t const conv_desc = iconv_open("UTF-8", fromcode);
-    if ((iconv_t)-1 == conv_desc)
+    if ((iconv_t)(-1) == conv_desc)
     {
         ERROR_LOG(COMMON, "Iconv initialization failure [%s]: %s", fromcode, strerror(errno));
+        iconv_close(conv_desc);
+        return {};
     }
-    else
-    {
-        size_t const in_bytes = sizeof(T) * input.size();
-        size_t const out_buffer_size = 4 * in_bytes;
 
-        std::string out_buffer;
-        out_buffer.resize(out_buffer_size);
+    const size_t in_bytes = sizeof(T) * input.size();
+    // Multiply by 4, which is the max number of bytes to encode a codepoint
+    const size_t out_buffer_size = 4 * in_bytes;
 
-        auto src_buffer = &input[0];
-        size_t src_bytes = in_bytes;
-        auto dst_buffer = &out_buffer[0];
-        size_t dst_bytes = out_buffer.size();
+    std::string out_buffer;
+    out_buffer.resize(out_buffer_size);
 
-        while (src_bytes != 0)
-        {
-            size_t const iconv_result = iconv(conv_desc, (char**)(&src_buffer), &src_bytes,
-                &dst_buffer, &dst_bytes);
+    auto src_buffer = &input[0];
+    size_t src_bytes = in_bytes;
+    auto dst_buffer = &out_buffer[0];
+    size_t dst_bytes = out_buffer.size();
 
-            if ((size_t)-1 == iconv_result)
+    while (0 != src_bytes)
+    {
+        size_t const iconv_result = iconv(conv_desc, (char**)(&src_buffer), &src_bytes,
+            &dst_buffer, &dst_bytes);
+
+        if (static_cast<size_t>(-1) == iconv_result)
+        {
+            if (EILSEQ == errno || EINVAL == errno)
             {
-                if (EILSEQ == errno || EINVAL == errno)
+                // Try to skip the bad character
+                if (0 != src_bytes)
                 {
-                    // Try to skip the bad character
-                    if (src_bytes != 0)
-                    {
-                        --src_bytes;
-                        ++src_buffer;
-                    }
-                }
-                else
-                {
-                    ERROR_LOG(COMMON, "iconv failure [%s]: %s", fromcode, strerror(errno));
-                    break;
+                    --src_bytes;
+                    ++src_buffer;
                 }
             }
+            else
+            {
+                ERROR_LOG(COMMON, "iconv failure [%s]: %s", fromcode, strerror(errno));
+                break;
+            }
         }
+    }
 
-        out_buffer.resize(out_buffer_size - dst_bytes);
-        out_buffer.swap(result);
-        
+    out_buffer.resize(out_buffer_size - dst_bytes);
+    out_buffer.swap(result);
+    
+    iconv_close(conv_desc);
+    
+    return result;
+}
+
+std::u16string UTF8ToUTF16(const std::string& input)
+{
+    std::u16string result;
+
+    iconv_t const conv_desc = iconv_open("UTF-16", "UTF-8");
+    if ((iconv_t)(-1) == conv_desc)
+    {
+        ERROR_LOG(COMMON, "Iconv initialization failure [UTF-8]: %s", strerror(errno));
         iconv_close(conv_desc);
+        return {};
     }
+
+    const size_t in_bytes = sizeof(char) * input.size();
+    // Multiply by 4, which is the max number of bytes to encode a codepoint
+    const size_t out_buffer_size = 4 * sizeof(char16_t) * in_bytes;
+
+    std::u16string out_buffer;
+    out_buffer.resize(out_buffer_size);
+
+    char* src_buffer = const_cast<char*>(&input[0]);
+    size_t src_bytes = in_bytes;
+    char* dst_buffer = (char*)(&out_buffer[0]);
+    size_t dst_bytes = out_buffer.size();
+
+    while (0 != src_bytes)
+    {
+        size_t const iconv_result = iconv(conv_desc, &src_buffer, &src_bytes,
+                                          &dst_buffer, &dst_bytes);
+
+        if (static_cast<size_t>(-1) == iconv_result)
+        {
+            if (EILSEQ == errno || EINVAL == errno)
+            {
+                // Try to skip the bad character
+                if (0 != src_bytes)
+                {
+                    --src_bytes;
+                    ++src_buffer;
+                }
+            }
+            else
+            {
+                ERROR_LOG(COMMON, "iconv failure [UTF-8]: %s", strerror(errno));
+                break;
+            }
+        }
+    }
+
+    out_buffer.resize(out_buffer_size - dst_bytes);
+    out_buffer.swap(result);
+
+    iconv_close(conv_desc);
     
     return result;
 }
 
+std::string UTF16ToUTF8(const std::u16string& input)
+{
+    return CodeToUTF8("UTF-16", input);
+}
+
 std::string CP1252ToUTF8(const std::string& input)
 {
     //return CodeToUTF8("CP1252//TRANSLIT", input);
@@ -523,19 +598,6 @@ std::string SHIFTJISToUTF8(const std::string& input)
     return CodeToUTF8("SJIS", input);
 }
 
-std::string UTF16ToUTF8(const std::wstring& input)
-{
-    std::string result =
-    //    CodeToUTF8("UCS-2", input);
-    //    CodeToUTF8("UCS-2LE", input);
-    //    CodeToUTF8("UTF-16", input);
-        CodeToUTF8("UTF-16LE", input);
-
-    // TODO: why is this needed?
-    result.erase(std::remove(result.begin(), result.end(), 0x00), result.end());
-    return result;
-}
-
 #endif
 
 }
diff --git a/src/common/string_util.h b/src/common/string_util.h
index a41ccc69..787a5663 100644
--- a/src/common/string_util.h
+++ b/src/common/string_util.h
@@ -89,20 +89,22 @@ std::string ReplaceAll(std::string result, const std::string& src, const std::st
 std::string UriDecode(const std::string & sSrc);
 std::string UriEncode(const std::string & sSrc);
 
+std::string UTF16ToUTF8(const std::u16string& input);
+std::u16string UTF8ToUTF16(const std::string& input);
+
 std::string CP1252ToUTF8(const std::string& str);
 std::string SHIFTJISToUTF8(const std::string& str);
-std::string UTF16ToUTF8(const std::wstring& str);
 
 #ifdef _WIN32
 
-std::wstring UTF8ToUTF16(const std::string& str);
+std::wstring UTF8ToUTF16W(const std::string& str);
 
 #ifdef _UNICODE
 inline std::string TStrToUTF8(const std::wstring& str)
 { return UTF16ToUTF8(str); }
 
 inline std::wstring UTF8ToTStr(const std::string& str)
-{ return UTF8ToUTF16(str); }
+{ return UTF8ToUTF16W(str); }
 #else
 inline std::string TStrToUTF8(const std::string& str)
 { return str; }
diff --git a/src/core/file_sys/archive.h b/src/core/file_sys/archive.h
index aeabf09a..38145eed 100644
--- a/src/core/file_sys/archive.h
+++ b/src/core/file_sys/archive.h
@@ -7,11 +7,13 @@
 #include <memory>
 
 #include "common/common_types.h"
+#include "common/string_util.h"
 #include "common/bit_field.h"
 
 #include "core/file_sys/file.h"
 #include "core/file_sys/directory.h"
 
+#include "core/mem_map.h"
 #include "core/hle/kernel/kernel.h"
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
@@ -19,6 +21,15 @@
 
 namespace FileSys {
 
+// Path string type
+enum LowPathType : u32 {
+    Invalid = 0,
+    Empty   = 1,
+    Binary  = 2,
+    Char    = 3,
+    Wchar   = 4
+};
+
 union Mode {
     u32 hex;
     BitField<0, 1, u32> read_flag;
@@ -26,6 +37,94 @@ union Mode {
     BitField<2, 1, u32> create_flag;
 };
 
+class Path {
+public:
+
+    Path():
+        type(Invalid)
+    {
+    }
+
+    Path(LowPathType type, u32 size, u32 pointer):
+        type(type)
+    {
+        switch (type) {
+            case Binary:
+            {
+                u8* data = Memory::GetPointer(pointer);
+                binary = std::vector<u8>(data, data + size);
+                break;
+            }
+            case Char:
+            {
+                const char* data = reinterpret_cast<const char*>(Memory::GetPointer(pointer));
+                string = std::string(data, size - 1); // Data is always null-terminated.
+                break;
+            }
+            case Wchar:
+            {
+                const char16_t* data = reinterpret_cast<const char16_t*>(Memory::GetPointer(pointer));
+                u16str = std::u16string(data, size/2 - 1); // Data is always null-terminated.
+                break;
+            }
+        }
+    }
+
+    LowPathType GetType() const {
+        return type;
+    }
+
+    const std::string AsString() const {
+        switch (GetType()) {
+            case Char:
+                return string;
+            case Wchar:
+                return Common::UTF16ToUTF8(u16str);
+            case Empty:
+                return {};
+            default:
+                ERROR_LOG(KERNEL, "LowPathType cannot be converted to string!");
+                return {};
+        }
+    }
+
+    const std::u16string AsU16Str() const {
+        switch (GetType()) {
+            case Char:
+                return Common::UTF8ToUTF16(string);
+            case Wchar:
+                return u16str;
+            case Empty:
+                return {};
+            default:
+                ERROR_LOG(KERNEL, "LowPathType cannot be converted to u16string!");
+                return {};
+        }
+    }
+
+    const std::vector<u8> AsBinary() const {
+        switch (GetType()) {
+            case Binary:
+                return binary;
+            case Char:
+                return std::vector<u8>(string.begin(), string.end());
+            case Wchar:
+                return std::vector<u8>(u16str.begin(), u16str.end());
+            case Empty:
+                return {};
+            default:
+                ERROR_LOG(KERNEL, "LowPathType cannot be converted to binary!");
+                return {};
+        }
+    }
+
+private:
+    LowPathType type;
+    std::vector<u8> binary;
+    std::string string;
+    std::u16string u16str;
+};
+
 class Archive : NonCopyable {
 public:
     /// Supported archive types
diff --git a/src/core/hle/service/fs_user.cpp b/src/core/hle/service/fs_user.cpp
index 8093254e..9dc83291 100644
--- a/src/core/hle/service/fs_user.cpp
+++ b/src/core/hle/service/fs_user.cpp
@@ -14,75 +14,6 @@
 
 namespace FS_User {
 
-FS_Path::FS_Path(LowPathType type, u32 size, u32 pointer):
-    type(type)
-{
-    switch (type) {
-        case Binary:
-        {
-            auto data = Memory::GetPointer(pointer);
-            binary = std::vector<u8>(data, data + size);
-            break;
-        }
-        case Char:
-        {
-            auto data = reinterpret_cast<const char*>(Memory::GetPointer(pointer));
-            string = std::string(data, size - 1);
-        }
-        case Wchar:
-        {
-            auto data = reinterpret_cast<const char16_t*>(Memory::GetPointer(pointer));
-            u16str = std::u16string(data, size/2 - 1);
-        }
-    }
-}
-
-FS_Path::LowPathType FS_Path::GetType() const {
-    return type;
-}
-
-const std::vector<u8>& FS_Path::GetBinary() const {
-    return binary;
-}
-
-const std::string& FS_Path::GetString() const {
-    _dbg_assert_msg_(KERNEL, type == Char, "LowPathType is not Char!");
-    return string;
-}
-
-const std::u16string& FS_Path::GetU16Str() const {
-    _dbg_assert_msg_(KERNEL, type == Wchar, "LowPathType is not Wchar!");
-    return u16str;
-}
-
-std::string FS_Path::AsString() {
-    switch (GetType()) {
-        case FS_Path::Char:
-            return GetString();
-        case FS_Path::Empty:
-            return {};
-        case FS_Path::Wchar:
-        {
-            auto str16 = GetU16Str();
-            return Common::UTF16ToUTF8(std::wstring(str16.cbegin(), str16.cend()));
-        }
-    }
-}
-
-std::u16string FS_Path::AsU16Str() {
-    switch (GetType()) {
-        case FS_Path::Wchar:
-            return GetU16Str();
-        case FS_Path::Empty:
-            return {};
-        case FS_Path::Char:
-        {
-            auto str = GetString();
-            return std::u16string(str.cbegin(), str.cend());
-        }
-    }
-}
-
 // We currently return 0 for success and -1 for failure in cmd_buff[1].  -1 was chosen because it
 // puts all the sections of the http://3dbrew.org/wiki/Error_codes to something non-zero, to make
 // sure we don't mislead the application into thinking something worked.
@@ -103,22 +34,22 @@ void OpenFile(Service::Interface* self) {
     // TODO(Link Mauve): cmd_buff[2], aka archive handle lower word, isn't used according to
     // 3dmoo's or ctrulib's implementations.  Triple check if it's really the case.
     Handle archive_handle = static_cast<Handle>(cmd_buff[3]);
-    auto filename_type    = static_cast<FS_Path::LowPathType>(cmd_buff[4]);
+    auto filename_type    = static_cast<FileSys::LowPathType>(cmd_buff[4]);
     u32 filename_size     = cmd_buff[5];
     FileSys::Mode mode; mode.hex = cmd_buff[6];
     u32 attributes        = cmd_buff[7]; // TODO(Link Mauve): do something with those attributes.
     u32 filename_ptr      = cmd_buff[9];
 
-    FS_Path file_path(filename_type, filename_size, filename_ptr);
+    FileSys::Path file_path(filename_type, filename_size, filename_ptr);
     std::string file_string;
     switch (file_path.GetType()) {
-        case FS_Path::Char:
-        case FS_Path::Wchar:
-            file_string = file_path.AsString();
-            break;
-        default:
-            WARN_LOG(KERNEL, "file LowPath type is currently unsupported; returning archive handle instead");
-            return;
+    case FileSys::Char:
+    case FileSys::Wchar:
+        file_string = file_path.AsString();
+        break;
+    default:
+        WARN_LOG(KERNEL, "file LowPath type is currently unsupported; returning archive handle instead");
+        return;
     }
 
     DEBUG_LOG(KERNEL, "type=%d size=%d mode=%d attrs=%d data=%s",
@@ -141,9 +72,9 @@ void OpenFileDirectly(Service::Interface* self) {
     u32* cmd_buff = Service::GetCommandBuffer();
 
     auto archive_id       = static_cast<FileSys::Archive::IdCode>(cmd_buff[2]);
-    auto archivename_type = static_cast<FS_Path::LowPathType>(cmd_buff[3]);
+    auto archivename_type = static_cast<FileSys::LowPathType>(cmd_buff[3]);
     u32 archivename_size  = cmd_buff[4];
-    auto filename_type    = static_cast<FS_Path::LowPathType>(cmd_buff[5]);
+    auto filename_type    = static_cast<FileSys::LowPathType>(cmd_buff[5]);
     u32 filename_size     = cmd_buff[6];
     FileSys::Mode mode; mode.hex = cmd_buff[7];
     u32 attributes        = cmd_buff[8]; // TODO(Link Mauve): do something with those attributes.
@@ -153,7 +84,7 @@ void OpenFileDirectly(Service::Interface* self) {
     DEBUG_LOG(KERNEL, "archive_type=%d archive_size=%d file_type=%d file_size=%d file_mode=%d file_attrs=%d",
               archivename_type, archivename_size, filename_type, filename_size, mode, attributes);
 
-    if (archivename_type != FS_Path::Empty) {
+    if (archivename_type != FileSys::Empty) {
         ERROR_LOG(KERNEL, "archive LowPath type other than empty is currently unsupported");
         cmd_buff[1] = -1;
         return;
@@ -172,16 +103,16 @@ void OpenFileDirectly(Service::Interface* self) {
         return;
     }
 
-    FS_Path file_path(filename_type, filename_size, filename_ptr);
+    FileSys::Path file_path(filename_type, filename_size, filename_ptr);
     std::string file_string;
     switch (file_path.GetType()) {
-        case FS_Path::Char:
-        case FS_Path::Wchar:
-            file_string = file_path.AsString();
-            break;
-        default:
-            WARN_LOG(KERNEL, "file LowPath type is currently unsupported; returning archive handle instead");
-            return;
+    case FileSys::Char:
+    case FileSys::Wchar:
+        file_string = file_path.AsString();
+        break;
+    default:
+        WARN_LOG(KERNEL, "file LowPath type is currently unsupported; returning archive handle instead");
+        return;
     }
 
     Handle handle = Kernel::OpenFileFromArchive(archive_handle, file_string, mode);
@@ -214,20 +145,20 @@ void CreateDirectory(Service::Interface* self) {
     // TODO: cmd_buff[2], aka archive handle lower word, isn't used according to
     // 3dmoo's or ctrulib's implementations.  Triple check if it's really the case.
     Handle archive_handle = static_cast<Handle>(cmd_buff[3]);
-    auto dirname_type = static_cast<FS_Path::LowPathType>(cmd_buff[4]);
+    auto dirname_type = static_cast<FileSys::LowPathType>(cmd_buff[4]);
     u32 dirname_size = cmd_buff[5];
     u32 dirname_ptr = cmd_buff[8];
 
-    FS_Path dir_path(dirname_type, dirname_size, dirname_ptr);
+    FileSys::Path dir_path(dirname_type, dirname_size, dirname_ptr);
     std::string dir_string;
     switch (dir_path.GetType()) {
-        case FS_Path::Char:
-        case FS_Path::Wchar:
-            dir_string = dir_path.AsString();
-            break;
-        default:
-            cmd_buff[1] = -1;
-            return;
+    case FileSys::Char:
+    case FileSys::Wchar:
+        dir_string = dir_path.AsString();
+        break;
+    default:
+        cmd_buff[1] = -1;
+        return;
     }
 
     DEBUG_LOG(KERNEL, "type=%d size=%d data=%s", dirname_type, dirname_size, dir_string.c_str());
@@ -243,20 +174,20 @@ void OpenDirectory(Service::Interface* self) {
     // TODO(Link Mauve): cmd_buff[2], aka archive handle lower word, isn't used according to
     // 3dmoo's or ctrulib's implementations.  Triple check if it's really the case.
     Handle archive_handle = static_cast<Handle>(cmd_buff[2]);
-    auto dirname_type = static_cast<FS_Path::LowPathType>(cmd_buff[3]);
+    auto dirname_type = static_cast<FileSys::LowPathType>(cmd_buff[3]);
     u32 dirname_size = cmd_buff[4];
     u32 dirname_ptr = cmd_buff[6];
 
-    FS_Path dir_path(dirname_type, dirname_size, dirname_ptr);
+    FileSys::Path dir_path(dirname_type, dirname_size, dirname_ptr);
     std::string dir_string;
     switch (dir_path.GetType()) {
-        case FS_Path::Char:
-        case FS_Path::Wchar:
-            dir_string = dir_path.AsString();
-            break;
-        default:
-            cmd_buff[1] = -1;
-            return;
+    case FileSys::Char:
+    case FileSys::Wchar:
+        dir_string = dir_path.AsString();
+        break;
+    default:
+        cmd_buff[1] = -1;
+        return;
     }
 
     DEBUG_LOG(KERNEL, "type=%d size=%d data=%s", dirname_type, dirname_size, dir_string.c_str());
@@ -278,13 +209,13 @@ void OpenArchive(Service::Interface* self) {
     u32* cmd_buff = Service::GetCommandBuffer();
 
     auto archive_id = static_cast<FileSys::Archive::IdCode>(cmd_buff[1]);
-    auto archivename_type = static_cast<FS_Path::LowPathType>(cmd_buff[2]);
+    auto archivename_type = static_cast<FileSys::LowPathType>(cmd_buff[2]);
     u32 archivename_size = cmd_buff[3];
     u32 archivename_ptr = cmd_buff[5];
 
     DEBUG_LOG(KERNEL, "type=%d size=%d", archivename_type, archivename_size);
 
-    if (archivename_type != FS_Path::Empty) {
+    if (archivename_type != FileSys::Empty) {
         ERROR_LOG(KERNEL, "archive LowPath type other than empty is currently unsupported");
         cmd_buff[1] = -1;
         return;
diff --git a/src/core/hle/service/fs_user.h b/src/core/hle/service/fs_user.h
index 44f89ef4..00538254 100644
--- a/src/core/hle/service/fs_user.h
+++ b/src/core/hle/service/fs_user.h
@@ -11,35 +11,6 @@
 
 namespace FS_User {
 
-class FS_Path {
-public:
-    // Command to access archive file
-    enum LowPathType : u32 {
-        Invalid = 0,
-        Empty   = 1,
-        Binary  = 2,
-        Char    = 3,
-        Wchar   = 4
-    };
-
-    FS_Path(LowPathType type, u32 size, u32 pointer);
-
-    LowPathType GetType() const;
-
-    const std::vector<u8>& GetBinary() const;
-    const std::string& GetString() const;
-    const std::u16string& GetU16Str() const;
-
-    std::string AsString();
-    std::u16string AsU16Str();
-
-private:
-    LowPathType type;
-    std::vector<u8> binary;
-    std::string string;
-    std::u16string u16str;
-};
-
 /// Interface to "fs:USER" service
 class Interface : public Service::Interface {
 public: