Merge branch 'master' of https://github.com/Antidote/libzelda

Conflicts:
	src/SpriteFileReader.cpp

include/BinaryReader.hpp

@@ -18,6 +18,7 @@
 
 #include "Stream.hpp"
 #include <string>
+#include <functional>
 
 namespace zelda
 {
@@ -64,6 +65,12 @@ public:
      */
     std::string filepath() const;
 
+    bool readBit();
+    Int8 readByte();
+    Uint8 readUByte();
+    Int8* readBytes(Int64 length);
+    Uint8* readUBytes(Int64 length);
+
     /*! \brief Reads a Int16 and swaps to proper endianness depending on platform
      *  and Stream settings, and advances the current position
      *
@@ -163,7 +170,9 @@ public:
      */
     std::string readString();
 
+    void setProgressCallback(std::function<void(int)> cb);
 protected:
+    void loadData();
     /*! \brief Overload of isOpenForWriting in Stream
      *
      * \return false
@@ -180,6 +189,9 @@ protected:
      */
     void writeBytes(Int8*, Int64);
     std::string m_filepath; //!< Path to the target file
+    Uint32      m_currentLength;
+    FILE*       m_file;
+    std::function<void(int)> m_progressCallback;
 };
 }
 }

include/Compression.hpp

@@ -28,6 +28,9 @@ namespace Compression
     Int32 decompressZlib(Uint8* src, Uint32 srcLen, Uint8* dst, Uint32 dstLen);
     Int32 compressZlib(const Uint8* src, Uint32 srcLen, Uint8* dst, Uint32 dstLen);
 
+    // lzo compression
+    Int32 decompressLZO(Uint8* source, Int32 sourceSize, Uint8* dest, Int32& dstSize);
+
     // Yaz0 encoding
     Uint32 yaz0Decode(Uint8* src, Uint8* dst, Uint32 uncompressedSize);
     Uint32 yaz0Encode(Uint8* src, Uint32 srcSize, Uint8* data);

include/Exception.hpp

@@ -18,6 +18,10 @@
 
 #include <string>
 
+#define __STRX(x) #x
+#define __STR(x) __STRX(x)
+#define __LINE_STRING__ __STR(__LINE__)
+
 namespace zelda
 {
 namespace error
@@ -53,4 +57,10 @@ protected:
 
 } // error
 } // zelda
+#define THROW_EXCEPTION(msg) \
+    do  \
+    { \
+        throw zelda::error::Exception(__LINE_STRING__ " " __FILE__ " " msg); \
+    } while(0)
+
 #endif

include/IOException.hpp

@@ -40,7 +40,7 @@ public:
     /*! \brief The constructor for an IOException
      *  \param message The error message to throw
      */
-    IOException(const std::string& message) :
+    inline IOException(const std::string& message) :
         Exception("IOException: " + message)
     {}
 };

include/InvalidDataException.hpp

@@ -0,0 +1,37 @@
+#ifndef INVALIDDATAEXCEPTION_HPP
+#define INVALIDDATAEXCEPTION_HPP
+
+#include "Exception.hpp"
+#include <sstream>
+
+namespace zelda
+{
+namespace error
+{
+/*! \class InvalidDataException
+ *  \brief An exception thrown on Invalid Data calls.
+ *
+ *  This should only be thrown when the library tries to
+ *  e.g pass a NULL pointer to a function which requires a valid pointer.
+ *  <br />
+ *  It is <b>NOT</b> appropriate to use <b>throw new</b> so avoid doing so,
+ *  keeping things on the stack as much as possible is very important for speed.
+ */
+class InvalidDataException : public Exception
+{
+public:
+    inline InvalidDataException(const std::string& error)
+        : Exception(error)
+    {
+    }
+};
+
+}
+}
+
+#define THROW_INVALID_DATA(msg) \
+    do  \
+    { \
+        throw zelda::error::InvalidDataException(__LINE_STRING__ " " __FILE__ " " msg); \
+    } while(0)
+#endif // INVALIDDATAEXCEPTION_HPP

include/Stream.hpp

@@ -122,6 +122,14 @@ public:
      * \throw IOException
      */
     virtual Int8 readByte();
+
+    /*! \brief Reads a byte at the current position and advances the current position
+     *
+     * \return Uint8 The value at the current position
+     * \throw IOException
+     */
+    virtual Uint8 readUByte();
+
     /*! \brief Reads a byte at the current position and advances the current position.
      *
      * \return Uint8* The buffer at the current position from the given length.

include/lzo.h

@@ -0,0 +1,46 @@
+/*
+ * LZO 1x decompression
+ * copyright (c) 2006 Reimar Doeffinger
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _LZO_H
+#define LZO_H
+
+#include "Types.hpp"
+
+#define LZO_INPUT_DEPLETED 1
+#define LZO_OUTPUT_FULL 2
+#define LZO_INVALID_BACKPTR 4
+#define LZO_ERROR 8
+
+#define LZO_INPUT_PADDING 4
+#define LZO_OUTPUT_PADDING 12
+
+typedef unsigned char uint8_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int lzo1x_decode(Uint8 *out, Int32 *outlen, Uint8 *in, Int32 *inlen);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif

libzelda.pri

@@ -0,0 +1,100 @@
+INCLUDEPATH += $$PWD/include
+
+QMAKE_CXXFLAGS = -std=c++0x
+
+unix:LIBS += -lz
+win32:LIBS += -lzlib
+HEADERS += \
+    $$PWD/include/utility.hpp \
+    $$PWD/include/utf8.h \
+    $$PWD/include/utf8/unchecked.h \
+    $$PWD/include/utf8/core.h \
+    $$PWD/include/utf8/checked.h \
+    $$PWD/include/Types.hpp \
+    $$PWD/include/TextStream.hpp \
+    $$PWD/include/Stream.hpp \
+    $$PWD/include/Mainpage.hpp \
+    $$PWD/include/InvalidOperationException.hpp \
+    $$PWD/include/IOException.hpp \
+    $$PWD/include/FileNotFoundException.hpp \
+    $$PWD/include/Exception.hpp \
+    $$PWD/include/BinaryWriter.hpp \
+    $$PWD/include/BinaryReader.hpp \
+    $$PWD/include/WiiBanner.hpp \
+    $$PWD/include/WiiFile.hpp \
+    $$PWD/include/WiiSave.hpp \
+    $$PWD/include/WiiSaveReader.hpp \
+    $$PWD/include/WiiSaveWriter.hpp \
+    $$PWD/include/aes.h \
+    $$PWD/include/bn.h \
+    $$PWD/include/ec.h \
+    $$PWD/include/md5.h \
+    $$PWD/include/sha1.h \
+    $$PWD/include/ALTTPStructs.hpp \
+    $$PWD/include/ALTTPQuest.hpp \
+    $$PWD/include/ALTTPFileWriter.hpp \
+    $$PWD/include/ALTTPFileReader.hpp \
+    $$PWD/include/ALTTPFile.hpp \
+    $$PWD/include/ALTTPEnums.hpp \
+    $$PWD/include/MCFileReader.hpp \
+    $$PWD/include/MCFile.hpp \
+    $$PWD/include/MCFileWriter.hpp \
+    $$PWD/include/ZQuestFileWriter.hpp \
+    $$PWD/include/ZQuestFileReader.hpp \
+    $$PWD/include/Compression.hpp \
+	$$PWD/include/lzo.h \    
+	$$PWD/include/WiiImage.hpp \
+    $$PWD/include/ZQuestFile.hpp \
+    $$PWD/include/Checksums.hpp \
+    $$PWD/include/SkywardSwordFile.hpp \
+    $$PWD/include/SkywardSwordFileReader.hpp \
+    $$PWD/include/SkywardSwordFileWriter.hpp \
+    $$PWD/include/SkywardSwordQuest.hpp \
+    $$PWD/include/Sprite.hpp \
+    $$PWD/include/SpriteFile.hpp \
+    $$PWD/include/SpriteFileReader.hpp \
+    $$PWD/include/SpriteFileWriter.hpp \
+    $$PWD/include/SpriteFrame.hpp \
+    $$PWD/include/SpritePart.hpp \
+    ../libzelda/include/InvalidDataException.hpp
+
+SOURCES += \
+    $$PWD/src/utility.cpp \
+    $$PWD/src/TextStream.cpp \
+    $$PWD/src/Stream.cpp \
+    $$PWD/src/BinaryWriter.cpp \
+    $$PWD/src/BinaryReader.cpp \
+    $$PWD/src/WiiBanner.cpp \
+    $$PWD/src/WiiFile.cpp \
+    $$PWD/src/WiiSave.cpp \
+    $$PWD/src/WiiSaveReader.cpp \
+    $$PWD/src/WiiSaveWriter.cpp \
+    $$PWD/src/aes.c \
+    $$PWD/src/bn.cpp \
+    $$PWD/src/ec.cpp \
+    $$PWD/src/md5.cpp \
+    $$PWD/src/sha1.cpp \
+    $$PWD/src/ALTTPQuest.cpp \
+    $$PWD/src/ALTTPFileWriter.cpp \
+    $$PWD/src/ALTTPFileReader.cpp \
+    $$PWD/src/ALTTPFile.cpp \
+    $$PWD/src/MCFileReader.cpp \
+    $$PWD/src/MCFile.cpp \
+    $$PWD/src/MCFileWriter.cpp \
+    $$PWD/src/ZQuestFileWriter.cpp \
+    $$PWD/src/ZQuestFileReader.cpp \
+    $$PWD/src/Compression.cpp \
+	$$PWD/src/lzo.c \
+    $$PWD/src/WiiImage.cpp \
+    $$PWD/src/ZQuestFile.cpp \
+    $$PWD/src/Checksums.cpp \
+    $$PWD/src/SkywardSwordFile.cpp \
+    $$PWD/src/SkywardSwordFileReader.cpp \
+    $$PWD/src/SkywardSwordFileWriter.cpp \
+    $$PWD/src/SkywardSwordQuest.cpp \
+    $$PWD/src/Sprite.cpp \
+    $$PWD/src/SpriteFile.cpp \
+    $$PWD/src/SpriteFileReader.cpp \
+    $$PWD/src/SpriteFileWriter.cpp \
+    $$PWD/src/SpriteFrame.cpp \
+    $$PWD/src/SpritePart.cpp

libzelda.pro

@@ -68,6 +68,7 @@ HEADERS += \
     include/ZQuestFileWriter.hpp \
     include/ZQuestFileReader.hpp \
     include/Compression.hpp \
+    include/lzo.h \
     include/WiiImage.hpp \
     include/ZQuestFile.hpp \
     include/Checksums.hpp \
@@ -108,6 +109,7 @@ SOURCES += \
     src/ZQuestFileWriter.cpp \
     src/ZQuestFileReader.cpp \
     src/Compression.cpp \
+    src/lzo.c \
     src/WiiImage.cpp \
     src/ZQuestFile.cpp \
     src/Checksums.cpp \

src/BinaryReader.cpp

@@ -49,43 +49,46 @@ BinaryReader::BinaryReader(const std::string& filename)
     : m_filepath(filename)
 {
     Stream::setAutoResizing(false);
-    FILE* in;
+}
-    Uint32 length;
-    in = fopen(filename.c_str(), "rb");
 
-    if (!in)
+bool BinaryReader::readBit()
-        throw error::FileNotFoundException(filename);
+{
+    if (!m_data)
+        loadData();
 
-    fseek(in, 0, SEEK_END);
+    return Stream::readBit();
-    length = ftell(in);
+}
-    fseek(in, 0, SEEK_SET);
-#ifdef HW_RVL
-    m_data = (Uint8*)memalign(32, length);
-#else
-    m_data = new Uint8[length];
-#endif
 
-    Uint32 done = 0;
+Int8 BinaryReader::readByte()
-    Uint32 blocksize = BLOCKSZ;
+{
-    do
+    if (!m_data)
-    {
+        loadData();
-        if (blocksize > length - done)
-            blocksize = length - done;
 
-        Int32 ret = fread(m_data + done, 1, blocksize, in);
+    return Stream::readByte();
+}
 
-        if (ret < 0)
+Uint8 BinaryReader::readUByte()
-            throw error::IOException("BinaryReader::BinaryReader -> reading data from disk");
+{
-        else if (ret == 0)
+    if (!m_data)
-            break;
+        loadData();
 
-        done += blocksize;
+    return Stream::readUByte();
-    } while (done < length);
+}
 
-    fclose(in);
+Int8* BinaryReader::readBytes(Int64 length)
-    m_length = length;
+{
-    m_position = 0;
+    if (!m_data)
-    m_bitPosition = 0;
+        loadData();
+
+    return Stream::readBytes(length);
+}
+
+Uint8* BinaryReader::readUBytes(Int64 length)
+{
+    if (!m_data)
+        loadData();
+
+    return Stream::readUBytes(length);
 }
 
 void BinaryReader::writeByte(Int8)
@@ -100,6 +103,9 @@ void BinaryReader::writeBytes(Int8*, Int64)
 
 Int16 BinaryReader::readInt16()
 {
+    if (!m_data)
+        loadData();
+
     if (m_bitPosition > 0)
     {
         m_bitPosition = 0;
@@ -118,6 +124,9 @@ Int16 BinaryReader::readInt16()
 
 Uint16 BinaryReader::readUInt16()
 {
+    if (!m_data)
+        loadData();
+
     if (m_bitPosition > 0)
     {
         m_bitPosition = 0;
@@ -136,6 +145,9 @@ Uint16 BinaryReader::readUInt16()
 
 Int32 BinaryReader::readInt32()
 {
+    if (!m_data)
+        loadData();
+
     if (m_bitPosition > 0)
     {
         m_bitPosition = 0;
@@ -153,6 +165,9 @@ Int32 BinaryReader::readInt32()
 
 Uint32 BinaryReader::readUInt32()
 {
+    if (!m_data)
+        loadData();
+
     if (m_bitPosition > 0)
     {
         m_bitPosition = 0;
@@ -171,6 +186,9 @@ Uint32 BinaryReader::readUInt32()
 
 Int64 BinaryReader::readInt64()
 {
+    if (!m_data)
+        loadData();
+
     if (m_bitPosition > 0)
     {
         m_bitPosition = 0;
@@ -189,6 +207,9 @@ Int64 BinaryReader::readInt64()
 
 Uint64 BinaryReader::readUInt64()
 {
+    if (!m_data)
+        loadData();
+
     if (m_bitPosition > 0)
     {
         m_bitPosition = 0;
@@ -206,6 +227,9 @@ Uint64 BinaryReader::readUInt64()
 
 float BinaryReader::readFloat()
 {
+    if (!m_data)
+        loadData();
+
     if (m_bitPosition > 0)
     {
         m_bitPosition = 0;
@@ -224,6 +248,9 @@ float BinaryReader::readFloat()
 
 double BinaryReader::readDouble()
 {
+    if (!m_data)
+        loadData();
+
     if (m_bitPosition > 0)
     {
         m_bitPosition = 0;
@@ -243,6 +270,9 @@ double BinaryReader::readDouble()
 
 bool BinaryReader::readBool()
 {
+    if (!m_data)
+        loadData();
+
     if (m_bitPosition > 0)
     {
         m_bitPosition = 0;
@@ -258,6 +288,8 @@ bool BinaryReader::readBool()
 
 std::string BinaryReader::readUnicode()
 {
+    if (!m_data)
+        loadData();
     std::string ret;
     std::vector<short> tmp;
 
@@ -288,6 +320,56 @@ std::string BinaryReader::readString()
     return ret;
 }
 
+void BinaryReader::setProgressCallback(std::function<void (int)> cb)
+{
+    m_progressCallback = cb;
+}
+
+void BinaryReader::loadData()
+{
+    FILE* in;
+    Uint32 length;
+    in = fopen(m_filepath.c_str(), "rb");
+
+    if (!in)
+        throw error::FileNotFoundException(m_filepath);
+
+    fseek(in, 0, SEEK_END);
+    length = ftell(in);
+    fseek(in, 0, SEEK_SET);
+#ifdef HW_RVL
+    m_data = (Uint8*)memalign(32, length);
+#else
+    m_data = new Uint8[length];
+#endif
+
+    Uint32 done = 0;
+    Uint32 blocksize = BLOCKSZ;
+    do
+    {
+        if (blocksize > length - done)
+            blocksize = length - done;
+
+        Int32 ret = fread(m_data + done, 1, blocksize, in);
+
+        if (ret < 0)
+            throw error::IOException("BinaryReader::BinaryReader -> reading data from disk");
+        else if (ret == 0)
+            break;
+
+        done += ret;
+
+        if (m_progressCallback)
+            m_progressCallback((int)((float)(done* 100.f)/length));
+
+    } while (done < length);
+
+    fclose(in);
+    m_length = length;
+    m_position = 0;
+    m_bitPosition = 0;
+}
+
 bool BinaryReader::isOpenForWriting()
 {
     return false;

src/Compression.cpp

@@ -15,8 +15,8 @@
 
 #include "Compression.hpp"
 #include "Exception.hpp"
+#include "lzo.h"
 #include <iostream>
-
 #include <zlib.h>
 
 namespace zelda
@@ -103,6 +103,13 @@ Int32 compressZlib(const Uint8 *src, Uint32 srcLen, Uint8 *dst, Uint32 dstLen)
     return ret;
 }
 
+Int32 decompressLZO(Uint8* source, Int32 sourceSize, Uint8* dest, Int32& dstSize)
+{
+    int size = dstSize;
+    int result = lzo1x_decode(dest, &size, source, &sourceSize);
+    dstSize = size;
+    return result;
+}
 
 //src points to the yaz0 source data (to the "real" source data, not at the header!)
 //dst points to a buffer uncompressedSize bytes large (you get uncompressedSize from
@@ -317,6 +324,8 @@ Uint32 simpleEnc(Uint8* src, Int32 size, Int32 pos, Uint32 *pMatchPos)
     return numBytes;
 }
 
+
+
 } // Compression
 } // io
 } // zelda

src/SkywardSwordFileReader.cpp

@@ -24,6 +24,8 @@ SkywardSwordFileReader::SkywardSwordFileReader(const std::string& filename)
 SkywardSwordFile* SkywardSwordFileReader::read()
 {
     SkywardSwordFile* file = NULL;
+    try
+    {
         if (base::length() != 0xFBE0)
             throw zelda::error::InvalidOperationException("SSFileReader::read -> File not the expected size of 0xFBE0");
 
@@ -51,6 +53,13 @@ SkywardSwordFile* SkywardSwordFileReader::read()
             base::seek(pos, base::Beginning);
             file->addQuest(q);
         }
+    }
+    catch(...)
+    {
+        delete file;
+        file = NULL;
+        throw;
+    }
 
     return file;
 }

src/SpriteFileReader.cpp

@@ -24,6 +24,9 @@ SpriteFileReader::SpriteFileReader(const std::string& filepath)
 
 Sakura::SpriteFile* SpriteFileReader::readFile()
 {
+    Sakura::SpriteFile* ret = NULL;
+    try
+    {
         Uint32 magic = base::readUInt32();
 
         if (magic != Sakura::SpriteFile::Magic)
@@ -49,7 +52,7 @@ Sakura::SpriteFile* SpriteFileReader::readFile()
         Uint16 spriteCount  = base::readUInt16();
 
         // Lets go ahead and create or new container.
-    Sakura::SpriteFile* ret = new Sakura::SpriteFile(width, height, originX, originY);
+        ret = new Sakura::SpriteFile(width, height, originX, originY);
 
         // The next four bytes are reserved to keep the header 32 byte aligned.
         // This isn't necessary for most systems, but it's eventually planned
@@ -185,6 +188,13 @@ Sakura::SpriteFile* SpriteFileReader::readFile()
         }
 
         ret->setSprites(sprites);
+    }
+    catch(...)
+    {
+        delete ret;
+        ret = NULL;
+        throw;
+    }
 
     return ret;
 }

src/Stream.cpp

@@ -28,7 +28,7 @@ namespace zelda
 namespace io
 {
 
-const Uint32 Stream::BLOCKSZ = 512;
+const Uint32 Stream::BLOCKSZ = (32*1024);
 
 Stream::Stream() :
     m_bitPosition(0),
@@ -198,6 +198,19 @@ Int8 Stream::readByte()
     return *(Int8*)(m_data + m_position++);
 }
 
+Uint8 Stream::readUByte()
+{
+    if (m_bitPosition > 0)
+    {
+        m_bitPosition = 0;
+        m_position += sizeof(Uint8);
+    }
+    if (m_position + 1 > m_length)
+        throw error::IOException("Stream::readUByte -> Position passed stream bounds");
+
+    return *(Uint8*)(m_data + m_position++);
+}
+
 Uint8 *Stream::readUBytes(Int64 length)
 {
     return (Uint8*)readBytes(length);

src/WiiSaveReader.cpp

@@ -54,6 +54,8 @@ WiiSaveReader::WiiSaveReader(const std::string& filename)
 WiiSave* WiiSaveReader::readSave()
 {
     WiiSave* ret = new WiiSave;
+    try
+    {
         if (length() < 0xF0C0)
             throw error::InvalidOperationException("WiiSaveReader::readSave -> Not a valid WiiSave");
 
@@ -98,6 +100,14 @@ WiiSave* WiiSaveReader::readSave()
         ret->setFiles(files);
 
         readCerts(totalSize);
+    }
+    catch(...)
+    {
+        delete ret;
+        ret = NULL;
+        throw;
+    }
+
     return ret;
 }
 
@@ -154,7 +164,7 @@ WiiBanner* WiiSaveReader::readBanner()
     gameId = base::readUInt64();
     bannerSize = base::readUInt32();
     permissions = base::readByte();
-/*    unk =*/ base::readByte();
+    /*    unk =*/ base::readByte();
     base::seek(0x10);
     // skip padding
     base::seek(2);

src/lzo.c

@@ -0,0 +1,225 @@
+/*
+ * LZO 1x decompression
+ * Copyright (c) 2006 Reimar Doeffinger
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+//! avoid e.g. MPlayers fast_memcpy, it slows things down here
+
+#undef memcpy
+#include <string.h>
+#include "lzo.h"
+
+//! define if we may write up to 12 bytes beyond the output buffer
+//#define OUTBUF_PADDED 1
+//! define if we may read up to 4 bytes beyond the input buffer
+//#define INBUF_PADDED 1
+typedef struct LZOContext {
+    Uint8 *in, *in_end;
+    Uint8 *out_start, *out, *out_end;
+    int error;
+} LZOContext;
+
+/**
+ * \brief read one byte from input buffer, avoiding overrun
+ * \return byte read
+ */
+static int get_byte(LZOContext *c) {
+    if (c->in < c->in_end)
+        return *c->in++;
+    c->error |= LZO_INPUT_DEPLETED;
+    return 1;
+}
+
+/**
+ * \brief decode a length value in the coding used by lzo
+ * \param x previous byte value
+ * \param mask bits used from x
+ * \return decoded length value
+ */
+static int get_len(LZOContext *c, int x, int mask) {
+    int cnt = x & mask;
+    if (!cnt) {
+        while (!(x = get_byte(c))) cnt += 255;
+        cnt += mask + x;
+    }
+    return cnt;
+}
+
+/**
+ * \brief copy bytes from input to output buffer with checking
+ * \param cnt number of bytes to copy, must be > 0
+ */
+static void copy(LZOContext *c, int cnt) {
+    register uint8_t *src = c->in;
+    register uint8_t *dst = c->out;
+    if (src + cnt > c->in_end) {
+        cnt = c->in_end - src;
+        c->error |= LZO_INPUT_DEPLETED;
+    }
+    if (dst + cnt > c->out_end) {
+        cnt = c->out_end - dst;
+        c->error |= LZO_OUTPUT_FULL;
+    }
+#if defined(INBUF_PADDED) && defined(OUTBUF_PADDED)
+    dst[0] = src[0];
+    dst[1] = src[1];
+    dst[2] = src[2];
+    dst[3] = src[3];
+    src += 4;
+    dst += 4;
+    cnt -= 4;
+    if (cnt > 0)
+#endif
+        memcpy(dst, src, cnt);
+    c->in = src + cnt;
+    c->out = dst + cnt;
+}
+
+/**
+ * \brief copy previously decoded bytes to current position
+ * \param back how many bytes back we start
+ * \param cnt number of bytes to copy, must be > 0
+ *
+ * cnt > back is valid, this will copy the bytes we just copied,
+ * thus creating a repeating pattern with a period length of back.
+ */
+static void copy_backptr(LZOContext *c, int back, int cnt) {
+    register uint8_t *src = &c->out[-back];
+    register uint8_t *dst = c->out;
+    if (src < c->out_start) {
+        c->error |= LZO_INVALID_BACKPTR;
+        return;
+    }
+    if (dst + cnt > c->out_end) {
+        cnt = c->out_end - dst;
+        c->error |= LZO_OUTPUT_FULL;
+    }
+    if (back == 1) {
+        memset(dst, *src, cnt);
+        dst += cnt;
+    } else {
+#ifdef OUTBUF_PADDED
+        dst[0] = src[0];
+        dst[1] = src[1];
+        dst[2] = src[2];
+        dst[3] = src[3];
+        src += 4;
+        dst += 4;
+        cnt -= 4;
+        if (cnt > 0) {
+            dst[0] = src[0];
+            dst[1] = src[1];
+            dst[2] = src[2];
+            dst[3] = src[3];
+            dst[4] = src[4];
+            dst[5] = src[5];
+            dst[6] = src[6];
+            dst[7] = src[7];
+            src += 8;
+            dst += 8;
+            cnt -= 8;
+        }
+#endif
+        if (cnt > 0) {
+            int blocklen = back;
+            while (cnt > blocklen) {
+                memcpy(dst, src, blocklen);
+                dst += blocklen;
+                cnt -= blocklen;
+                blocklen <<= 1;
+            }
+            memcpy(dst, src, cnt);
+        }
+        dst += cnt;
+    }
+    c->out = dst;
+}
+
+/**
+ * \brief decode LZO 1x compressed data
+ * \param out output buffer
+ * \param outlen size of output buffer, number of bytes left are returned here
+ * \param in input buffer
+ * \param inlen size of input buffer, number of bytes left are returned here
+ * \return 0 on success, otherwise error flags, see lzo.h
+ *
+ * make sure all buffers are appropriately padded, in must provide
+ * LZO_INPUT_PADDING, out must provide LZO_OUTPUT_PADDING additional bytes
+ */
+int lzo1x_decode(Uint8 *out, Int32 *outlen, Uint8 *in, Int32 *inlen) {
+    enum {COPY, BACKPTR} state = COPY;
+    Int32 x;
+    LZOContext c;
+    c.in = in;
+    c.in_end = in + *inlen;
+    c.out = c.out_start = out;
+    c.out_end = out + * outlen;
+    c.error = 0;
+    x = get_byte(&c);
+    if (x > 17) {
+        copy(&c, x - 17);
+        x = get_byte(&c);
+        if (x < 16) c.error |= LZO_ERROR;
+    }
+    while (!c.error) {
+        int cnt, back;
+        if (x >> 4) {
+            if (x >> 6) {
+                cnt = (x >> 5) - 1;
+                back = (get_byte(&c) << 3) + ((x >> 2) & 7) + 1;
+            } else if (x >> 5) {
+                cnt = get_len(&c, x, 31);
+                x = get_byte(&c);
+                back = (get_byte(&c) << 6) + (x >> 2) + 1;
+            } else {
+                cnt = get_len(&c, x, 7);
+                back = (1 << 14) + ((x & 8) << 11);
+                x = get_byte(&c);
+                back += (get_byte(&c) << 6) + (x >> 2);
+                if (back == (1 << 14)) {
+                    if (cnt != 1)
+                        c.error |= LZO_ERROR;
+                    break;
+                }
+            }
+        } else
+        switch (state) {
+            case COPY:
+                cnt = get_len(&c, x, 15);
+                copy(&c, cnt + 3);
+                x = get_byte(&c);
+                if (x >> 4)
+                    continue;
+                cnt = 1;
+                back = (1 << 11) + (get_byte(&c) << 2) + (x >> 2) + 1;
+                break;
+            case BACKPTR:
+                cnt = 0;
+                back = (get_byte(&c) << 2) + (x >> 2) + 1;
+                break;
+        }
+        copy_backptr(&c, back, cnt + 2);
+        cnt = x & 3;
+        state = cnt ? BACKPTR : COPY;
+        if (cnt)
+            copy(&c, cnt);
+        x = get_byte(&c);
+    }
+    *inlen = c.in_end - c.in;
+    *outlen = c.out_end - c.out;
+    return c.error;
+}