CWE-ou-minkata/Sources/Plasma/CoreLib/plFileSystem.cpp

/*==LICENSE==*

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*==LICENSE==*/

#include "plFileSystem.h"

#if HS_BUILD_FOR_WIN32
#   include "hsWindows.h"
#   include <shlobj.h>
#else
#   include <limits.h>
#   include <unistd.h>
#   include <sys/types.h>
#   include <cstdlib>
#   include <functional>
#   include <memory>
#endif
#include <sys/stat.h>
#include "plProduct.h"

/* NOTE For this file:  Windows uses UTF-16 filenames, and does not support
 * the use of UTF-8 in their ANSI API.  In order to ensure proper unicode
 * support, we convert the UTF-8 format stored in plString to UTF-16 before
 * passing them along to Windows.
 */

plString plFileName::GetFileName() const
{
    int end = fName.FindLast('/');
    if (end < 0)
        end = fName.FindLast('\\');
    if (end < 0)
        return fName;

    return fName.Substr(end + 1);
}

plString plFileName::GetFileExt() const
{
    int dot = fName.FindLast('.');

    // Be sure not to get a dot in the directory!
    int end = fName.FindLast('/');
    if (end < 0)
        end = fName.FindLast('\\');

    if (dot > end)
        return fName.Substr(dot + 1);

    return plString::Null;
}

plString plFileName::GetFileNameNoExt() const
{
    int dot = fName.FindLast('.');

    int end = fName.FindLast('/');
    if (end < 0)
        end = fName.FindLast('\\');

    // Be sure not to get a dot in the directory!
    if (dot > end)
        return fName.Substr(end + 1, dot - end - 1);
    return fName.Substr(end + 1);
}

plFileName plFileName::StripFileName() const
{
    int end = fName.FindLast('/');
    if (end < 0)
        end = fName.FindLast('\\');
    if (end < 0)
        return "";

    return fName.Left(end);
}

plFileName plFileName::StripFileExt() const
{
    int dot = fName.FindLast('.');

    // Be sure not to get a dot in the directory!
    int end = fName.FindLast('/');
    if (end < 0)
        end = fName.FindLast('\\');

    if (dot > end)
        return fName.Left(dot);

    return *this;
}

plFileName plFileName::Normalize(char slash) const
{
    plStringBuffer<char> norm;
    char *norm_p = norm.CreateWritableBuffer(fName.GetSize());
    for (const char *p = fName.c_str(); *p; ++p) {
        if (*p == '/' || *p == '\\')
            *norm_p++ = slash;
        else
            *norm_p++ = *p;
    }
    *norm_p = 0;
    return plString(norm);
}

plFileName plFileName::AbsolutePath() const
{
    if (!IsValid())
        return *this;

    plFileName path = Normalize();

#if HS_BUILD_FOR_WIN32
    plStringBuffer<wchar_t> wideName = path.fName.ToWchar();
    wchar_t path_sm[MAX_PATH];
    uint32_t path_length = GetFullPathNameW(wideName, MAX_PATH, path_sm, nullptr);
    if (path_length >= MAX_PATH) {
        // Buffer not big enough
        wchar_t *path_lg = new wchar_t[path_length];
        GetFullPathNameW(wideName, path_length, path_lg, nullptr);
        path = plString::FromWchar(path_lg);
        delete [] path_lg;
    } else {
        path = plString::FromWchar(path_sm);
    }
#else
    char *path_a = realpath(path.fName.c_str(), nullptr);
    hsAssert(path_a, "Failure to get absolute path (unsupported libc?)");
    path = path_a;
    free(path_a);
#endif

    return path;
}

plFileName plFileName::Join(const plFileName &base, const plFileName &path)
{
    if (!base.IsValid())
        return path;
    if (!path.IsValid())
        return base;

    char last = base.fName.CharAt(base.GetSize() - 1);
    char first = path.fName.CharAt(0);
    if (last != '/' && last != '\\') {
        if (first != '/' && first != '\\') {
            return plString::Format("%s" PATH_SEPARATOR_STR "%s",
                                    base.fName.c_str(), path.fName.c_str());
        }
        return base.fName + path.fName;
    } else if (first != '/' && first != '\\') {
        return base.fName + path.fName;
    }
    // Both have a slash, but we only need one
    return base.fName + path.fName.Substr(1);
}


/* plFileInfo */
plFileInfo::plFileInfo(const plFileName &filename)
    : fFileSize(-1), fCreateTime(), fModifyTime(), fFlags()
{
    if (!filename.IsValid())
        return;

#if HS_BUILD_FOR_WIN32
    struct __stat64 info;
    if (!_wstat64(filename.AsString().ToWchar(), &info) == 0)
        return;
#else
    struct stat info;
    if (!stat(filename.AsString().c_str(), &info) == 0)
        return;
#endif

    fFlags |= kEntryExists;
    fFileSize = info.st_size;
    fCreateTime = info.st_ctime;
    fModifyTime = info.st_mtime;
    if (info.st_mode & S_IFDIR)
        fFlags |= kIsDirectory;
    if (info.st_mode & S_IFREG)
        fFlags |= kIsNormalFile;
}


/* plFileSystem */
plFileName plFileSystem::GetCWD()
{
    plFileName cwd;

#if HS_BUILD_FOR_WIN32
    wchar_t cwd_sm[MAX_PATH];
    uint32_t cwd_length = GetCurrentDirectoryW(MAX_PATH, cwd_sm);
    if (cwd_length >= MAX_PATH) {
        // Buffer not big enough
        wchar_t *cwd_lg = new wchar_t[cwd_length];
        GetCurrentDirectoryW(cwd_length, cwd_lg);
        cwd = plString::FromWchar(cwd_lg);
        delete [] cwd_lg;
    } else {
        cwd = plString::FromWchar(cwd_sm);
    }
#else
    char *cwd_a = getcwd(nullptr, 0);
    hsAssert(cwd_a, "Failure to get working directory (unsupported libc?)");
    cwd = cwd_a;
    free(cwd_a);
#endif

    return cwd;
}

FILE *plFileSystem::Open(const plFileName &filename, const char *mode)
{
#if HS_BUILD_FOR_WIN32
    wchar_t wmode[8];
    size_t mlen = strlen(mode);
    hsAssert(mlen < arrsize(wmode), "Mode string too long");

    // Quick and dirty, because mode should only ever be ANSI chars
    for (size_t i = 0; i < mlen; ++i) {
        hsAssert(!(mode[i] & 0x80), "I SAID mode should ONLY ever be ANSI chars!");
        wmode[i] = static_cast<wchar_t>(mode[i]);
    }
    wmode[mlen] = 0;

    return _wfopen(filename.AsString().ToWchar(), wmode);
#else
    return fopen(filename.AsString().c_str(), mode);
#endif
}

bool plFileSystem::Unlink(const plFileName &filename)
{
#if HS_BUILD_FOR_WIN32
    return _wunlink(filename.AsString().ToWchar()) == 0;
#else
    return unlink(filename.AsString().c_str()) == 0;
#endif
}

bool plFileSystem::Move(const plFileName &from, const plFileName &to)
{
#if HS_BUILD_FOR_WIN32
    return MoveFileW(from.AsString().ToWchar(), to.AsString().ToWchar());
#else
    if (!Copy(from, to))
        return false;
    return Unlink(from);
#endif
}

bool plFileSystem::Copy(const plFileName &from, const plFileName &to)
{
#if HS_BUILD_FOR_WIN32
    return CopyFileW(from.AsString().ToWchar(), to.AsString().ToWchar(), FALSE);
#else
    typedef std::unique_ptr<FILE, std::function<int (FILE *)>> _FileRef;

    _FileRef ffrom(Open(from, "rb"), fclose);
    _FileRef fto(Open(to, "wb"), fclose);
    if (!ffrom.get() || !fto.get())
        return false;

    size_t count;
    uint8_t buffer[4096];
    while (!feof(ffrom.get())) {
        count = fread(buffer, sizeof(uint8_t), arrsize(buffer), ffrom.get());
        if (ferror(ffrom.get()))
            return false;
        fwrite(buffer, sizeof(uint8_t), count, fto.get());
    }

    return true;
#endif
}

bool plFileSystem::CreateDir(const plFileName &dir, bool checkParents)
{
    if (checkParents) {
        plFileName parent = dir.StripFileName();
        if (parent.IsValid() && !plFileInfo(parent).Exists() && !CreateDir(parent, true))
            return false;
    }

    if (plFileInfo(dir).Exists())
        return true;

#if HS_BUILD_FOR_WIN32
    return CreateDirectoryW(dir.AsString().ToWchar(), nullptr);
#else
    return (mkdir(dir.AsString().c_str(), 0755) == 0);
#endif
}

plFileName plFileSystem::GetUserDataPath()
{
    static plFileName _userData;

    if (!_userData.IsValid()) {
#if HS_BUILD_FOR_WIN32
        wchar_t path[MAX_PATH];
        if (!SHGetSpecialFolderPathW(NULL, path, CSIDL_LOCAL_APPDATA, TRUE))
            return "";

        _userData = plFileName::Join(plString::FromWchar(path), plProduct::LongName());
#else
        _userData = plFileName::Join(getenv("HOME"), "." + plProduct::LongName());
#endif
        plFileSystem::CreateDir(_userData);
    }

    return _userData;
}

plFileName plFileSystem::GetInitPath()
{
    static plFileName _initPath = plFileName::Join(GetUserDataPath(), "Init");
    plFileSystem::CreateDir(_initPath);
    return _initPath;
}

plFileName plFileSystem::GetLogPath()
{
    static plFileName _logPath = plFileName::Join(GetUserDataPath(), "Log");
    plFileSystem::CreateDir(_logPath);
    return _logPath;
}