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/*
 * << Haru Free PDF Library 2.0.6 >> -- hpdf.cs
 *
 * C# wrapper for libhpdf.dll
 *
 * Copyright (c) 1999-2006 Takeshi Kanno <takeshi_kanno@est.hi-ho.ne.jp>
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.
 * It is provided "as is" without express or implied warranty.
 *
 */

using System;
using System.Runtime.InteropServices;

namespace HPdf {

public enum HPdfPageLayout : uint {
    HPDF_PAGE_LAYOUT_SINGLE = 0,
    HPDF_PAGE_LAYOUT_ONE_COLUMN,
    HPDF_PAGE_LAYOUT_TWO_CLUMN_LEFT,
    HPDF_PAGE_LAYOUT_TWO_CLUMN_RIGHT,
    HPDF_PAGE_LAYOUT_EOF
};

public enum HPdfPageMode : uint {
    HPDF_PAGE_MODE_USE_NONE = 0,
    HPDF_PAGE_MODE_USE_OUTLINE,
    HPDF_PAGE_MODE_USE_THUMBS,
    HPDF_PAGE_MODE_FULL_SCREEN,
    HPDF_PAGE_MODE_EOF
};

public enum HPdfPageSizes : uint {
    HPDF_PAGE_SIZE_LETTER = 0,
    HPDF_PAGE_SIZE_LEGAL,
    HPDF_PAGE_SIZE_A3,
    HPDF_PAGE_SIZE_A4,
    HPDF_PAGE_SIZE_A5,
    HPDF_PAGE_SIZE_B4,
    HPDF_PAGE_SIZE_B5,
    HPDF_PAGE_SIZE_EXECUTIVE,
    HPDF_PAGE_SIZE_US4x6,
    HPDF_PAGE_SIZE_US4x8,
    HPDF_PAGE_SIZE_US5x7,
    HPDF_PAGE_SIZE_COMM10,
    HPDF_PAGE_SIZE_EOF
};

public enum HPdfPageDirection : uint {
    HPDF_PAGE_PORTRAIT = 0,
    HPDF_PAGE_LANDSCAPE
};

public enum HPdfPageNumStyle : uint {
    HPDF_PAGE_NUM_STYLE_DECIMAL = 0,
    HPDF_PAGE_NUM_STYLE_UPPER_ROMAN,
    HPDF_PAGE_NUM_STYLE_LOWER_ROMAN,
    HPDF_PAGE_NUM_STYLE_UPPER_LETTERS,
    HPDF_PAGE_NUM_STYLE_LOWER_LETTERS,
    HPDF_PAGE_NUM_STYLE_EOF
};

public enum HPdfWritingMode : uint {
    HPDF_WMODE_HORIZONTAL = 0,
    HPDF_WMODE_VERTICAL,
    HPDF_WMODE_EOF
};

public enum HPdfEncoderType : uint {
    HPDF_ENCODER_TYPE_SINGLE_BYTE = 0,
    HPDF_ENCODER_TYPE_DOUBLE_BYTE,
    HPDF_ENCODER_TYPE_UNINITIALIZED,
    HPDF_ENCODER_UNKNOWN
};

public enum HPdfByteType : uint {
    HPDF_BYTE_TYPE_SINGLE = 0,
    HPDF_BYTE_TYPE_LEAD,
    HPDF_BYTE_TYPE_TRIAL,
    HPDF_BYTE_TYPE_UNKNOWN
};

public enum HPdfAnnotHighlightMode : uint {
    HPDF_ANNOT_NO_HIGHTLIGHT = 0,
    HPDF_ANNOT_INVERT_BOX,
    HPDF_ANNOT_INVERT_BORDER,
    HPDF_ANNOT_DOWN_APPEARANCE,
    HPDF_ANNOT_HIGHTLIGHT_MODE_EOF
};

public enum HPdfAnnotIcon : uint {
    HPDF_ANNOT_ICON_COMMENT = 0,
    HPDF_ANNOT_ICON_KEY,
    HPDF_ANNOT_ICON_NOTE,
    HPDF_ANNOT_ICON_HELP,
    HPDF_ANNOT_ICON_NEW_PARAGRAPH,
    HPDF_ANNOT_ICON_PARAGRAPH,
    HPDF_ANNOT_ICON_INSERT,
    HPDF_ANNOT_ICON_EOF
};

public enum HPdfColorSpace : uint {
    HPDF_CS_DEVICE_GRAY = 0,
    HPDF_CS_DEVICE_RGB,
    HPDF_CS_DEVICE_CMYK,
    HPDF_CS_CAL_GRAY,
    HPDF_CS_CAL_RGB,
    HPDF_CS_LAB,
    HPDF_CS_ICC_BASED,
    HPDF_CS_SEPARATION,
    HPDF_CS_DEVICE_N,
    HPDF_CS_INDEXED,
    HPDF_CS_PATTERN,
    HPDF_CS_EOF
};

public enum HPdfInfoType : uint {
    /* date-time type parameters */
    HPDF_INFO_CREATION_DATE = 0,
    HPDF_INFO_MOD_DATE = 1,

/* string type parameters */
    HPDF_INFO_AUTHOR = 2,
    HPDF_INFO_CREATOR = 3,
    HPDF_INFO_PRODUCER = 4,
    HPDF_INFO_TITLE = 5,
    HPDF_INFO_SUBJECT = 6,
    HPDF_INFO_KEYWORDS = 7,
    HPDF_INFO_EOF = 8
};

public enum  HPdfEncryptMode: uint {
    HPDF_ENCRYPT_R2    = 2,
    HPDF_ENCRYPT_R3    = 3
};

public enum  HPdfTextRenderingMode: uint {
    HPDF_FILL = 0,
    HPDF_STROKE = 1,
    HPDF_FILL_THEN_STROKE = 2,
    HPDF_INVISIBLE = 3,
    HPDF_FILL_CLIPPING = 4,
    HPDF_STROKE_CLIPPING = 5,
    HPDF_FILL_STROKE_CLIPPING = 6,
    HPDF_CLIPPING = 7,
    HPDF_RENDERING_MODE_EOF = 8
};

public enum HPdfLineCap {
    HPDF_BUTT_END = 0,
    HPDF_ROUND_END = 1,
    HPDF_PROJECTING_SCUARE_END = 2,
    HPDF_LINECAP_EOF = 3
};

public enum HPdfLineJoin {
    HPDF_MITER_JOIN = 0,
    HPDF_ROUND_JOIN = 1,
    HPDF_BEVEL_JOIN = 2,
    HPDF_LINEJOIN_EOF = 3
};

public enum HPdfTextAlignment {
    HPDF_TALIGN_LEFT = 0,
    HPDF_TALIGN_RIGHT = 1,
    HPDF_TALIGN_CENTER = 2,
    HPDF_TALIGN_JUSTIFY = 3
};

public enum HPdfTransitionStyle {
    HPDF_TS_WIPE_RIGHT = 0,
    HPDF_TS_WIPE_UP,
    HPDF_TS_WIPE_LEFT,
    HPDF_TS_WIPE_DOWN,
    HPDF_TS_BARN_DOORS_HORIZONTAL_OUT,
    HPDF_TS_BARN_DOORS_HORIZONTAL_IN,
    HPDF_TS_BARN_DOORS_VERTICAL_OUT,
    HPDF_TS_BARN_DOORS_VERTICAL_IN,
    HPDF_TS_BOX_OUT,
    HPDF_TS_BOX_IN,
    HPDF_TS_BLINDS_HORIZONTAL,
    HPDF_TS_BLINDS_VERTICAL,
    HPDF_TS_DISSOLVE,
    HPDF_TS_GLITTER_RIGHT,
    HPDF_TS_GLITTER_DOWN,
    HPDF_TS_GLITTER_TOP_LEFT_TO_BOTTOM_RIGHT,
    HPDF_TS_REPLACE,
    HPDF_TS_EOF
};

public enum HPdfBlendMode {
    HPDF_BM_NORMAL = 0,
    HPDF_BM_MULTIPLY,
    HPDF_BM_SCREEN,
    HPDF_BM_OVERLAY,
    HPDF_BM_DARKEN,
    HPDF_BM_LIGHTEN,
    HPDF_BM_COLOR_DODGE,
    HPDF_BM_COLOR_BUM,
    HPDF_BM_HARD_LIGHT,
    HPDF_BM_SOFT_LIGHT,
    HPDF_BM_DIFFERENCE,
    HPDF_BM_EXCLUSHON,
    HPDF_BM_EOF
};

[StructLayout(LayoutKind.Sequential)]
public struct HPdfRect {
    public float left;
    public float  bottom;
    public float  right;
    public float  top;
}

[StructLayout(LayoutKind.Sequential)]
public struct HPdfBox {
    public float left;
    public float  bottom;
    public float  right;
    public float  top;
}

[StructLayout(LayoutKind.Sequential)]
public struct HPdfPoint {
    public float  x;
    public float  y;
}

[StructLayout(LayoutKind.Sequential)]
public struct HPdfDate {
    public int    year;
    public int    month;
    public int    day;
    public int    hour;
    public int    minutes;
    public int    seconds;
    public char   ind;
    public int    off_hour;
    public int    off_minutes;
};

[StructLayout(LayoutKind.Sequential)]
public struct HPdfTextWidth {
    public uint numchars;

/* don't use this value (it may be change in the feature).
       use numspace as alternated. */
    public uint numwords;

public uint width;
    public uint numspace;
}

[StructLayout(LayoutKind.Sequential)]
public struct HPdfTransMatrix {
    public float    a;
    public float    b;
    public float    c;
    public float    d;
    public float    x;
    public float    y;
};

[StructLayout(LayoutKind.Sequential)]
public struct HPdfDashMode_Internal {
    public ushort  ptn0;
    public ushort  ptn1;
    public ushort  ptn2;
    public ushort  ptn3;
    public ushort  ptn4;
    public ushort  ptn5;
    public ushort  ptn6;
    public ushort  ptn7;
    public uint    num_ptn;
    public uint    phase;
};

public struct HPdfDashMode {
    public ushort[]  ptn;
    public uint      phase;
};

[StructLayout(LayoutKind.Sequential)]
public struct HPdfRGBColor {
    public float   r;
    public float   g;
    public float   b;
};

[StructLayout(LayoutKind.Sequential)]
public struct HPdfCMYKColor {
    public float   c;
    public float   y;
    public float   m;
    public float   k;
};

/* error handler (call back function) */
public delegate void HPDF_ErrorHandler(uint error_no, uint detail_no,
        IntPtr user_data);

public class HPdfDoc: IDisposable {
    public const int HPDF_TRUE = 1;
    public const int HPDF_FALSE = 0;
    public const uint HPDF_COMP_NONE = 0;
    public const uint HPDF_COMP_TEXT = 1;
    public const uint HPDF_COMP_IMAGE = 2;
    public const uint HPDF_COMP_METADATA = 4;
    public const uint HPDF_COMP_ALL = 15;

public const uint HPDF_HIDE_TOOLBAR = 1;
    public const uint HPDF_HIDE_MENUBAR = 2;
    public const uint HPDF_HIDE_WINDOW_UI = 4;
    public const uint HPDF_FIT_WINDOW = 8;
    public const uint HPDF_CENTER_WINDOW = 16;

public const uint HPDF_ENABLE_READ = 0;
    public const uint HPDF_ENABLE_PRINT = 4;
    public const uint HPDF_ENABLE_EDIT_ALL = 8;
    public const uint HPDF_ENABLE_COPY = 16;
    public const uint HPDF_ENABLE_EDIT = 32;

[DllImport("libhpdf.dll")]
    private extern static string HPDF_GetVersion();

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_New(HPDF_ErrorHandler user_error_fn,
            IntPtr user_data);

[DllImport("libhpdf.dll")]
    private extern static void HPDF_Free(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_NewDoc(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_FreeDoc(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_FreeDocAll(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_HasDoc(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SaveToFile(IntPtr pdf, string file_name);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_GetError(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_GetErrorDetail(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static void HPDF_ResetError(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetPagesConfiguration(IntPtr pdf,
            uint page_per_pages);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_GetPageByIndex(IntPtr pdf,
            uint index);

[DllImport("libhpdf.dll")]
    private extern static HPdfPageLayout HPDF_GetPageLayout(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetPageLayout(IntPtr pdf,
            HPdfPageLayout layout);

[DllImport("libhpdf.dll")]
    private extern static HPdfPageMode HPDF_GetPageMode(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetPageMode(IntPtr pdf, HPdfPageMode mode);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetOpenAction(IntPtr pdf,
            IntPtr open_action);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_GetViewerPreference(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetViewerPreference(IntPtr pdf, uint value);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_GetCurrentPage(IntPtr  pdf);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_AddPage(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_InsertPage(IntPtr pdf,
                    IntPtr  page);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_GetFont(IntPtr pdf, string font_name,
                    string encoding_name);

[DllImport("libhpdf.dll")]
    private extern static string HPDF_LoadType1FontFromFile(IntPtr pdf,
                    string afmfilename, string pfmfilename);

[DllImport("libhpdf.dll")]
    private extern static string HPDF_LoadTTFontFromFile(IntPtr pdf,
                    string file_name, int embedding);

[DllImport("libhpdf.dll")]
    private extern static string HPDF_LoadTTFontFromFile2(IntPtr pdf,
                    string file_name, uint index, int embedding);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_AddPageLabel(IntPtr pdf, uint page_num,
                  HPdfPageNumStyle style, uint first_page, string prefix);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_UseJPFonts(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_UseKRFonts(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_UseCNSFonts(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_UseCNTFonts(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_CreateOutline(IntPtr pdf, IntPtr parent,
                    string title, IntPtr encoder);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_GetEncoder(IntPtr pdf,
                    string encoding_name);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_GetCurrentEncoder(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetCurrentEncoder(IntPtr pdf,
                    string encoding_name);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_UseJPEncodings(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_UseKREncodings(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_UseCNSEncodings(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_UseCNTEncodings(IntPtr pdf);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_LoadPngImageFromFile(IntPtr pdf,
                    string filename);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_LoadPngImageFromFile2(IntPtr pdf,
                    string filename);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_LoadJpegImageFromFile(IntPtr pdf,
                    string filename);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_LoadRawImageFromFile(IntPtr pdf,
                    string filename, uint width, uint height,
                    HPdfColorSpace color_space);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_LoadRawImageFromMem(IntPtr pdf,
                    byte[] data, int width, int height,
                    HPdfColorSpace color_space,
                    uint bits_per_component);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetInfoAttr(IntPtr pdf,
                    HPdfInfoType type, string value);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetInfoDateAttr(IntPtr pdf,
                    HPdfInfoType type, HPdfDate value);

[DllImport("libhpdf.dll")]
    private extern static string HPDF_GetInfoAttr(IntPtr pdf,
                    HPdfInfoType type);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetPassword(IntPtr pdf,
                    string owner_passwd, string user_passwd);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetPermission(IntPtr pdf,
                    uint permission);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetEncryptionMode(IntPtr pdf,
                    HPdfEncryptMode mode, uint key_len);

[DllImport("libhpdf.dll")]
    private extern static uint HPDF_SetCompressionMode(IntPtr pdf,
                    uint mode);

[DllImport("libhpdf.dll")]
    private extern static IntPtr HPDF_CreateExtGState(IntPtr pdf);

// handle to an instance of a HPdfDoc object.
    private IntPtr hpdf;

public HPdfDoc() {
        HPDF_ErrorHandler error_handler =
                new HPDF_ErrorHandler(HPdfDoc.ErrorProc);
        hpdf = HPDF_New(error_handler, IntPtr.Zero);
        if (hpdf == IntPtr.Zero) {
            throw new Exception("cannot create HPdfDoc object.");
        }
    }

void IDisposable.Dispose() {
        if (hpdf != IntPtr.Zero) {
            HPDF_Free(hpdf);
        }

hpdf = IntPtr.Zero;
    }

~HPdfDoc() {
        if (hpdf != IntPtr.Zero) {
            HPDF_Free(hpdf);
        }
    }

public static string HPdfGetVersion() {
        return HPDF_GetVersion();
    }

public static void ErrorProc(uint error_no, uint detail_no,
            IntPtr user_data) {
        string s = "error-code=0x" + error_no.ToString("X") + " detail-code=" + detail_no;
        throw new Exception(s);
    }

public void NewDoc() {
        HPDF_NewDoc(hpdf);
    }

public void FreeDoc() {
        HPDF_FreeDoc(hpdf);
    }

public void FreeDocAll() {
        HPDF_FreeDocAll(hpdf);
    }

public bool HasDoc() {
        return (HPDF_HasDoc(hpdf) != 0);
    }

public void SaveToFile(string file_name) {
        HPDF_SaveToFile(hpdf, file_name);
    }

public uint GetError() {
        return HPDF_GetError(hpdf);
    }

public uint GetErrorDetail() {
        return HPDF_GetErrorDetail(hpdf);
    }

public void ResetError() {
        HPDF_ResetError(hpdf);
    }

public void SetPagesConfiguration(uint page_per_pages) {
        HPDF_SetPagesConfiguration(hpdf, page_per_pages);
    }

public HPdfPage GetPageByIndex(uint index) {
        IntPtr hpage;

hpage = HPDF_GetPageByIndex(hpdf, index);
        return new HPdfPage(hpage);
    }

public HPdfPageLayout GetPageLayout() {
        return HPDF_GetPageLayout(hpdf);
    }

public void SetPageLayout(HPdfPageLayout layout) {
        HPDF_SetPageLayout(hpdf, layout);
    }

public HPdfPageMode GetPageMode() {
        return HPDF_GetPageMode(hpdf);
    }

public void SetPageMode(HPdfPageMode mode) {
        HPDF_SetPageMode(hpdf, mode);
    }

public void SetOpenAction(HPdfDestination open_action) {
        if (open_action == null) {
            // ERROR!!
        } else {
            HPDF_SetOpenAction(hpdf, open_action.GetHandle());
        }
    }

public uint GetViewerPreference() {
        return HPDF_GetViewerPreference(hpdf);
    }

public void SetViewerPreference(uint value) {
        HPDF_SetViewerPreference(hpdf, value);
    }

public HPdfPage GetCurrentPage() {
        IntPtr hpage;

hpage = HPDF_GetCurrentPage(hpdf);
        return new HPdfPage(hpage);
    }

public HPdfPage AddPage() {
        IntPtr hpage;

hpage = HPDF_AddPage(hpdf);
        return new HPdfPage(hpage);
    }

public HPdfPage InsertPage(HPdfPage page) {
        IntPtr hpage;

hpage = HPDF_InsertPage(hpdf, page.GetHandle());
        return new HPdfPage(hpage);
    }

public HPdfFont GetFont(string font_name, string encoding_name) {
        IntPtr hfont;

hfont = HPDF_GetFont(hpdf, font_name, encoding_name);
        return new HPdfFont(hfont);
    }

public string LoadType1FontFromFile(string afmfilename,
            string pfmfilename) {
        string font_name;

font_name = HPDF_LoadType1FontFromFile(hpdf, afmfilename, pfmfilename);
        return font_name;
    }

public string LoadTTFontFromFile(string file_name, bool embedding) {
        string font_name;
        int emb;

if (embedding)
            emb = HPDF_TRUE;
        else
            emb = HPDF_FALSE;

font_name = HPDF_LoadTTFontFromFile(hpdf, file_name, emb);
        return font_name;
    }

public string LoadTTFontFromFile2(string file_name, uint index,
            bool embedding) {
        string font_name;
        int emb;

if (embedding)
            emb = HPDF_TRUE;
        else
            emb = HPDF_FALSE;

font_name = HPDF_LoadTTFontFromFile2(hpdf, file_name, index, emb);
        return font_name;
    }

public void AddPageLabel(uint page_num, HPdfPageNumStyle style,
            uint first_page, string prefix) {
        HPDF_AddPageLabel(hpdf, page_num, style, first_page, prefix);
    }

public uint UseJPFonts() {
        return HPDF_UseJPFonts(hpdf);
    }

public uint UseKRFonts() {
        return HPDF_UseKRFonts(hpdf);
    }

public uint UseCNSFonts() {
        return HPDF_UseCNSFonts(hpdf);
    }

public uint UseCNTFonts() {
        return HPDF_UseCNTFonts(hpdf);
    }

public HPdfOutline CreateOutline(HPdfOutline parent, string title,
            HPdfEncoder encoder) {
        IntPtr hparent;
        IntPtr hencoder;
        IntPtr houtline;

if (encoder != null)
            hencoder = encoder.GetHandle();
        else
            hencoder = IntPtr.Zero;

if (parent != null)
            hparent = parent.GetHandle();
        else
            hparent = IntPtr.Zero;

houtline = HPDF_CreateOutline(hpdf, hparent, title, hencoder);
        return new HPdfOutline(houtline);
    }

public HPdfEncoder GetEncoder(string encoding_name) {
        IntPtr hencoder;

hencoder = HPDF_GetEncoder(hpdf, encoding_name);

return new HPdfEncoder(hencoder);
    }

public HPdfEncoder GetCurrentEncoder() {
        IntPtr hencoder;

hencoder = HPDF_GetCurrentEncoder(hpdf);

return new HPdfEncoder(hencoder);
    }

public void SetCurrentEncoder(string encoding_name) {
        HPDF_SetCurrentEncoder(hpdf, encoding_name);
    }

public uint UseJPEncodings() {
        return HPDF_UseJPEncodings(hpdf);
    }

public uint UseKREncodings() {
        return HPDF_UseKREncodings(hpdf);
    }

public uint UseCNSEncodings() {
        return HPDF_UseCNSEncodings(hpdf);
    }

public uint UseCNTEncodings() {
        return HPDF_UseCNTEncodings(hpdf);
    }

public HPdfImage LoadPngImageFromFile(string filename) {
        IntPtr hobj;

hobj = HPDF_LoadPngImageFromFile(hpdf, filename);