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

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

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*==LICENSE==*/
#include <ctype.h>
#include "hsStream.h"
#include "hsMemory.h"


#include "hsTemplates.h"

#if HS_BUILD_FOR_UNIX
#include <unistd.h>
#endif


#if HS_BUILD_FOR_WIN32
#include <io.h>
#endif

//////////////////////////////////////////////////////////////////////////////////

void hsStream::FastFwd()
{
    hsThrow("FastFwd unimplemented by subclass of stream");
}

uint32_t hsStream::GetPosition() const
{
    return fPosition;
}

void hsStream::SetPosition(uint32_t position)
{
    if (position == fPosition)
        return;
    Rewind();
    Skip(position);
}

void hsStream::Truncate()
{
    hsThrow("Truncate unimplemented by subclass of stream");
}

uint32_t hsStream::GetSizeLeft()
{
    uint32_t ret = 0;
    if (GetPosition() > GetEOF())
    {
        hsThrow("Position is beyond EOF");
    }
    else
    {
        ret = GetEOF() - GetPosition();
    }

    return ret;
}

//////////////////////////////////////////////////////////////////////////////////

uint32_t hsStream::GetEOF()
{
    hsThrow( "GetEOF() unimplemented by subclass of stream");
    return 0;
}

void hsStream::CopyToMem(void* mem)
{
    hsThrow( "CopyToMem unimplemented by subclass of stream");
}

//////////////////////////////////////////////////////////////////////////////////

uint32_t hsStream::WriteFmt(const char * fmt, ...)
{
    va_list av;
    va_start( av, fmt );
    uint32_t n = WriteFmtV( fmt, av );
    va_end( av );
    return n;
}

uint32_t hsStream::WriteFmtV(const char * fmt, va_list av)
{
    plString buf = plString::IFormat(fmt, av);
    return Write( buf.GetSize(), buf.c_str() );
}

uint32_t hsStream::WriteSafeStringLong(const plString &string)
{
    uint32_t len = string.GetSize();
    WriteLE32(len);
    if (len > 0)
    {   
        const char *buffp = string.c_str();
        uint32_t i;
        for (i = 0; i < len; i++)
        {
            WriteByte(~buffp[i]);
        }
        return i;
    }
    else
        return 0;
}

uint32_t hsStream::WriteSafeWStringLong(const plString &string)
{
    plStringBuffer<uint16_t> wbuff = string.ToUtf16();
    uint32_t len = wbuff.GetSize();
    WriteLE32(len);
    if (len > 0)
    {
        const uint16_t *buffp = wbuff.GetData();
        for (uint32_t i=0; i<len; i++)
        {
            WriteLE16(~buffp[i]);
        }
        WriteLE16(static_cast<uint16_t>(0));
    }
    return 0;
}

plString hsStream::ReadSafeStringLong_TEMP()
{
    plStringBuffer<char> name;
    uint32_t numChars = ReadLE32();
    if (numChars > 0 && numChars <= GetSizeLeft())
    {
        char *buff = name.CreateWritableBuffer(numChars);
        Read(numChars, buff);
        buff[numChars] = 0;

        // if the high bit is set, flip the bits. Otherwise it's a normal string, do nothing.
        if (buff[0] & 0x80)
        {
            for (int i = 0; i < numChars; i++)
                buff[i] = ~buff[i];
        }       
    }

    return name;
}

char *hsStream::ReadSafeStringLong()
{
    plString name = ReadSafeStringLong_TEMP();
    char *buff = new char[name.GetSize() + 1];
    memcpy(buff, name.c_str(), name.GetSize() + 1);
    return buff;
}

plString hsStream::ReadSafeWStringLong_TEMP()
{
    plStringBuffer<uint16_t> retVal;
    uint32_t numChars = ReadLE32();
    if (numChars > 0 && numChars <= (GetSizeLeft()/2)) // divide by two because each char is two bytes
    {
        uint16_t *buff = retVal.CreateWritableBuffer(numChars);
        for (int i=0; i<numChars; i++)
            buff[i] = ReadLE16();
        ReadLE16(); // we wrote the null out, read it back in
        buff[numChars] = 0; // But terminate it safely anyway

        if (buff[0]* 0x80)
        {
            for (int i=0; i<numChars; i++)
                buff[i] = ~buff[i];
        }
    }

    return plString::FromUtf16(retVal);
}

wchar_t *hsStream::ReadSafeWStringLong()
{
    // Horribly inefficient (convert to UTF-8 and then back to UTF-16), which
    // is why this should go away completely after plString has taken over
    // the world^H^H^H^H^HPlasma
    plStringBuffer<wchar_t> retVal = ReadSafeWStringLong_TEMP().ToWchar();
    wchar_t *buff = new wchar_t[retVal.GetSize() + 1];
    memcpy(buff, retVal.GetData(), retVal.GetSize() + 1);
    return buff;
}

uint32_t hsStream::WriteSafeString(const plString &string)
{
    int len = string.GetSize();
    hsAssert(len<0xf000, plString::Format("string len of %d is too long for WriteSafeString %s, use WriteSafeStringLong",
        len, string.c_str()).c_str() );

    WriteLE16(len | 0xf000);
    if (len > 0)
    {
        uint32_t i;
        const char *buffp = string.c_str();
        for (i = 0; i < len; i++)
        {
            WriteByte(~buffp[i]);
        }
        return i;
    }
    else
        return 0;
}

uint32_t hsStream::WriteSafeWString(const plString &string)
{
    plStringBuffer<uint16_t> wbuff = string.ToUtf16();
    uint32_t len = wbuff.GetSize();
    hsAssert(len<0xf000, plString::Format("string len of %d is too long for WriteSafeWString, use WriteSafeWStringLong",
        len).c_str() );

    WriteLE16(len | 0xf000);
    if (len > 0)
    {
        const uint16_t *buffp = wbuff.GetData();
        for (uint32_t i=0; i<len; i++)
        {
            WriteLE16(~buffp[i]);
        }
        WriteLE16(static_cast<uint16_t>(0));
    }
    return 0;
}

plString hsStream::ReadSafeString_TEMP()
{
    plStringBuffer<char> name;
    uint16_t numChars = ReadLE16();

#ifndef REMOVE_ME_SOON
    // Backward compat hack - remove in a week or so (from 6/30/03)
    bool oldFormat = !(numChars & 0xf000);
    if (oldFormat)
        ReadLE16();
#endif

    numChars &= ~0xf000;
    hsAssert(numChars <= GetSizeLeft(), "Bad string");
    if (numChars > 0 && numChars <= GetSizeLeft())
    {
        char *buff = name.CreateWritableBuffer(numChars);
        Read(numChars, buff);
        buff[numChars] = 0;

        // if the high bit is set, flip the bits. Otherwise it's a normal string, do nothing.
        if (buff[0] & 0x80)
        {
            int i;
            for (i = 0; i < numChars; i++)
                buff[i] = ~buff[i];
        }
    }

    return name;
}

char *hsStream::ReadSafeString()
{
    plString name = ReadSafeString_TEMP();
    char *buff = new char[name.GetSize() + 1];
    memcpy(buff, name.c_str(), name.GetSize() + 1);
    return buff;
}

plString hsStream::ReadSafeWString_TEMP()
{
    plStringBuffer<uint16_t> retVal;
    uint32_t numChars = ReadLE16();
    
    numChars &= ~0xf000;
    hsAssert(numChars <= GetSizeLeft()/2, "Bad string");
    if (numChars > 0 && numChars <= (GetSizeLeft()/2)) // divide by two because each char is two bytes
    {
        uint16_t *buff = retVal.CreateWritableBuffer(numChars);
        for (int i=0; i<numChars; i++)
            buff[i] = ReadLE16();
        ReadLE16(); // we wrote the null out, read it back in
        buff[numChars] = 0; // But terminate it safely anyway

        if (buff[0]* 0x80)
        {
            for (int i=0; i<numChars; i++)
                buff[i] = ~buff[i];
        }
    }

    return plString::FromUtf16(retVal);
}

wchar_t *hsStream::ReadSafeWString()
{
    // Horribly inefficient (convert to UTF-8 and then back to UTF-16), which
    // is why this should go away completely after plString has taken over
    // the world^H^H^H^H^HPlasma
    plStringBuffer<wchar_t> retVal = ReadSafeWString_TEMP().ToWchar();
    wchar_t *buff = new wchar_t[retVal.GetSize() + 1];
    memcpy(buff, retVal.GetData(), retVal.GetSize() + 1);
    return buff;
}

bool  hsStream::Read4Bytes(void *pv)  // Virtual, faster version in sub classes
{
    int knt = this->Read(sizeof(uint32_t), pv);
    if (knt != 4)
        return false;
    return true;
}

bool  hsStream::Read12Bytes(void *buffer) // Reads 12 bytes, return true if success
{
    int knt = this->Read(12,buffer);
    if (knt != 12)
        return false;
    return true;
}

bool  hsStream::Read8Bytes(void *buffer)  // Reads 12 bytes, return true if success
{
    int knt = this->Read(8,buffer);
    if (knt !=8)
        return false;
    return true;
}

bool hsStream::ReadBOOL()
{
    uint32_t val;
    this->Read(sizeof(uint32_t), &val);
    return val != 0;
}

bool hsStream::ReadBool() // Virtual, faster version in sub classes
{
    return (this->ReadByte() != 0);
}

void hsStream::ReadBool(int count, bool values[])
{
    this->Read(count, values);
}

uint8_t hsStream::ReadByte()
{
    uint8_t   value;

    this->Read(sizeof(uint8_t), &value);
    return value;
}

bool hsStream::AtEnd()
{
    hsAssert(0,"No hsStream::AtEnd() implemented for this stream class");
    return false;
}

bool hsStream::IsTokenSeparator(char c)
{
    return (isspace(c) || c==',' || c=='=');
}

bool hsStream::GetToken(char *s, uint32_t maxLen, const char beginComment, const char endComment)
{
    char c;
    char endCom;
        endCom = endComment;

    while( true )
    {
        while( !AtEnd() && IsTokenSeparator(c = ReadByte()) )
            c = c;
            ;
        if( AtEnd() )
            return false;

        if( beginComment != c )
            break;

        // skip to end of comment
        while( !AtEnd() && (endCom != (c = ReadByte())) )
            c= c;
            ;
    }

    s[0] = c;
    uint32_t k = 1;
    while( !AtEnd() && !IsTokenSeparator(c = ReadByte()) )
    {
        if( k < maxLen )
            s[k++] = c;
    }
    s[k] = 0;


    if( (k > 0)&&!stricmp(s, "skip") )
    {
        int depth = 1;
        while( depth && GetToken(s, maxLen, beginComment, endCom) )
        {
            if( !stricmp(s, "skip") )
                depth++;
            else
            if( !stricmp(s, "piks") )
                depth--;
        }
        return GetToken(s, maxLen, beginComment, endCom);
    }

    return true;
}

bool hsStream::ReadLn(char *s, uint32_t maxLen, const char beginComment, const char endComment)
{
    char c;
    char endCom;
        endCom = endComment;

    while( true )
    {
        while( !AtEnd() && strchr("\r\n",c = ReadByte()) )
            c = c;
            ;
        if( AtEnd() )
            return false;

        if( beginComment != c )
            break;

        // skip to end of comment
        while( !AtEnd() && (endCom != (c = ReadByte())) )
            c= c;
            ;
    }

    s[0] = c;
    uint32_t k = 1;
    while( !AtEnd() && !strchr("\r\n",c = ReadByte()) )
    {
        if( k < maxLen )
            s[k++] = c;
    }
    s[k] = 0;


    if( (k > 0)&&!stricmp(s, "skip") )
    {
        int depth = 1;
        while( depth && ReadLn(s, maxLen, beginComment, endCom) )
        {
            if( !stricmp(s, "skip") )
                depth++;
            else
            if( !stricmp(s, "piks") )
                depth--;
        }
        return ReadLn(s, maxLen, beginComment, endCom);
    }

    return true;
}

uint16_t hsStream::ReadLE16()
{
    uint16_t  value;
    this->Read(sizeof(uint16_t), &value);
    value = hsToLE16(value);
    return value;
}

void hsStream::ReadLE16(int count, uint16_t values[])
{
    this->Read(count * sizeof(uint16_t), values);
    for (int i = 0; i < count; i++)
        values[i] = hsToLE16(values[i]);
}

uint32_t hsStream::ReadLE32()
{
    uint32_t  value;
    Read4Bytes(&value);
    value = hsToLE32(value);
    return value;
}

void hsStream::ReadLE32(int count, uint32_t values[])
{
    this->Read(count * sizeof(uint32_t), values);
    for (int i = 0; i < count; i++)
        values[i] = hsToLE32(values[i]);
}

uint32_t hsStream::ReadBE32()
{
    uint32_t  value;
    Read4Bytes(&value);
    value = hsToBE32(value);
    return value;
}

double hsStream::ReadLEDouble()
{
    double  value;
    Read8Bytes(&value);
    value = hsToLEDouble(value);
    return value;
}

void hsStream::ReadLEDouble(int count, double values[])
{
    this->Read(count * sizeof(double), values);
    for (int i = 0; i < count; i++)
        values[i] = hsToLEDouble(values[i]);
}


float hsStream::ReadLEFloat()
{
    float   value;
    Read4Bytes(&value);
    value = hsToLEFloat(value);
    return value;
}

void hsStream::ReadLEFloat(int count, float values[])
{
    this->Read(count * sizeof(float), values);
    for (int i = 0; i < count; i++)
        values[i] = hsToLEFloat(values[i]);
}

float hsStream::ReadBEFloat()
{
    float   value;
    this->Read(sizeof(float), &value);
    value = hsToBEFloat(value);
    return value;
}


void hsStream::WriteBOOL(bool value)
{
    uint32_t dst = value != 0;
    this->Write(sizeof(uint32_t), &dst);
}

void hsStream::WriteBool(bool value)
{
    uint8_t dst = value != 0;
    this->Write(sizeof(uint8_t), &dst);
}

void hsStream::WriteBool(int count, const bool values[])
{
    this->Write(count, values);
}

void hsStream::WriteByte(uint8_t value)
{
    this->Write(sizeof(uint8_t), &value);
}

void  hsStream::WriteLE16(uint16_t value)
{
    value = hsToLE16(value);
    this->Write(sizeof(int16_t), &value);
}

void  hsStream::WriteLE16(int count, const uint16_t values[])
{
    for (int i = 0; i < count; i++)
        this->WriteLE16(values[i]);
}

void  hsStream::WriteLE32(uint32_t value)
{
    value = hsToLE32(value);
    this->Write(sizeof(int32_t), &value);
}

void  hsStream::WriteLE32(int count, const uint32_t values[])
{
    for (int i = 0; i < count; i++)
        this->WriteLE32(values[i]);
}

void hsStream::WriteBE32(uint32_t value)
{
    value = hsToBE32(value);
    this->Write(sizeof(int32_t), &value);
}

void hsStream::WriteLEDouble(double value)
{
    value = hsToLEDouble(value);
    this->Write(sizeof(double), &value);
}

void hsStream::WriteLEDouble(int count, const double values[])
{
    for (int i = 0; i < count; i++)
        this->WriteLEDouble(values[i]);
}

void hsStream::WriteLEFloat(float value)
{
    value = hsToLEFloat(value);
    this->Write(sizeof(float), &value);
}

void hsStream::WriteLEFloat(int count, const float values[])
{
    for (int i = 0; i < count; i++)
        this->WriteLEFloat(values[i]);
}

void hsStream::WriteBEFloat(float value)
{
    value = hsToBEFloat(value);
    this->Write(sizeof(float), &value);
}

void hsStream::WriteLEAtom(uint32_t tag, uint32_t size)
{
    this->WriteLE32(tag);
    this->WriteLE32(size);
}

uint32_t hsStream::ReadLEAtom(uint32_t* sizePtr)
{
    uint32_t  tag = this->ReadLE32();
    uint32_t  size = this->ReadLE32();

    if (sizePtr)
        *sizePtr = size;
    return tag;
}


//////////////////////////////////////////////////////////////////////////////////////


hsUNIXStream::~hsUNIXStream()
{
    // Don't Close here, because Sub classes Don't always want that behaviour!
}

bool hsUNIXStream::Open(const plFileName &name, const char *mode)
{
    fPosition = 0;
    fRef = plFileSystem::Open(name, mode);
    return (fRef) ? true : false;
}

bool hsUNIXStream::Close()
{
    int rtn = true;
    if (fRef)
        rtn = fclose(fRef);
    fRef = nil;
    delete [] fBuff;
    fBuff = nil;

    return !rtn;
}

uint32_t hsUNIXStream::Read(uint32_t bytes,  void* buffer)
{
    if (!fRef || !bytes)
        return 0;
    size_t numItems = ::fread(buffer, 1 /*size*/, bytes /*count*/, fRef);
    fBytesRead += numItems;
    fPosition += numItems;
    if (numItems < bytes)
    {
        if (!feof(fRef))
        {
            hsDebugMessage("Error on UNIX Read", ferror(fRef));
        }
    }
    return numItems;
}

bool  hsUNIXStream::AtEnd()
{
    if (!fRef)
        return 1;
    bool rVal;
    int x = getc(fRef);
    rVal = feof(fRef) != 0;
    ungetc(x, fRef);
    return rVal;
}

uint32_t hsUNIXStream::Write(uint32_t bytes, const void* buffer)
{
    if (!fRef)
        return 0;
    fPosition += bytes;
    return fwrite(buffer, bytes, 1, fRef);
}

void hsUNIXStream::SetPosition(uint32_t position)
{
    if (!fRef || (position == fPosition))
        return;
    fBytesRead = position;
    fPosition = position;
    (void)::fseek(fRef, position, SEEK_SET);
}

void hsUNIXStream::Skip(uint32_t delta)
{
    if (!fRef)
        return;
    fBytesRead += delta;
    fPosition += delta;
    (void)::fseek(fRef, delta, SEEK_CUR);
}

void hsUNIXStream::Rewind()
{
    if (!fRef)
        return;
    fBytesRead = 0;
    fPosition = 0;
    (void)::fseek(fRef, 0, SEEK_SET);
}

void hsUNIXStream::FastFwd()
{
    if (!fRef)
        return;
    (void)::fseek(fRef, 0, SEEK_END);
    fBytesRead = fPosition = ftell(fRef);
}

uint32_t  hsUNIXStream::GetEOF()
{
    if( !fRef )
        return 0;

    long oldPos = ftell( fRef );
    (void)::fseek( fRef, 0, SEEK_END );
    uint32_t end = (uint32_t)ftell( fRef );
    (void)::fseek( fRef, oldPos, SEEK_SET );

    return end;
}

void hsUNIXStream::Truncate()
{
    if (!fRef)
        return;
    int handle = fileno(fRef);
#if HS_BUILD_FOR_WIN32
    _chsize(handle, fPosition);
#else
    ftruncate(handle, fPosition);
#endif
}

void hsUNIXStream::Flush()
{
    if (!fRef)
        return;
    (void)::fflush(fRef);
}


//////////////////////////////////////////////////////////////////////////////////////

plReadOnlySubStream::~plReadOnlySubStream()
{
}

void    plReadOnlySubStream::Open( hsStream *base, uint32_t offset, uint32_t length )
{
    fBase = base;
    fOffset = offset;
    fLength = length;

    fBase->SetPosition( fOffset );
    IFixPosition();
}

void    plReadOnlySubStream::IFixPosition( void )
{
    fPosition = fBase->GetPosition() - fOffset;
}

bool  plReadOnlySubStream::AtEnd()
{
    if( fPosition >= fLength )
        return true;
    return false;
}

uint32_t  plReadOnlySubStream::Read(uint32_t byteCount, void* buffer)
{
    if( byteCount > GetSizeLeft() )
    {
        hsThrow("Attempting to read past end of stream");
        byteCount = GetSizeLeft();
    }

    uint32_t read = fBase->Read( byteCount, buffer );
    IFixPosition();
    return read;
}

uint32_t  plReadOnlySubStream::Write(uint32_t byteCount, const void* buffer)
{
    hsAssert( false, "Write not allowed on an plReadOnlySubStream" );
    return 0;
}

void    plReadOnlySubStream::Skip(uint32_t deltaByteCount)
{
    fBase->Skip( deltaByteCount );
    IFixPosition();
}

void    plReadOnlySubStream::Rewind()
{
    fBase->SetPosition( fOffset );
    IFixPosition();
}

void    plReadOnlySubStream::FastFwd()
{
    fBase->SetPosition( fOffset + fLength );
    IFixPosition();
}

void    plReadOnlySubStream::Truncate()
{
    hsAssert( false, "Can't truncate a read-only stream" );
}

uint32_t  plReadOnlySubStream::GetEOF()
{
    return fLength;
}

//////////////////////////////////////////////////////////////////////////////////////

#define kRAMStreamChunkSize     1024

hsRAMStream::hsRAMStream() : fAppender(1, kRAMStreamChunkSize)
{
    fIter.ResetToHead(&fAppender);
}

hsRAMStream::hsRAMStream(uint32_t chunkSize) : fAppender(1, chunkSize)
{
    fIter.ResetToHead(&fAppender);
}

hsRAMStream::~hsRAMStream()
{
}

void hsRAMStream::Reset()
{
    fBytesRead = 0;
    fPosition = 0;

    fAppender.Reset();
    fIter.ResetToHead(&fAppender);
}

bool hsRAMStream::AtEnd()
{
    return (fBytesRead >= fAppender.Count() * fAppender.ElemSize());
}

uint32_t hsRAMStream::Read(uint32_t byteCount, void * buffer)
{
    if (fBytesRead + byteCount > fAppender.Count() * fAppender.ElemSize())
        byteCount = (fAppender.Count() * fAppender.ElemSize()) - fBytesRead;

    fBytesRead += byteCount;
    fPosition += byteCount;

    fIter.Next(byteCount, buffer);

    return byteCount;
}

uint32_t hsRAMStream::Write(uint32_t byteCount, const void* buffer)
{
    fPosition += byteCount;

    fAppender.PushTail(byteCount, buffer);

    return byteCount;
}

void hsRAMStream::Skip(uint32_t deltaByteCount)
{
    fPosition += deltaByteCount;
    fIter.Next(deltaByteCount, nil);
}

void hsRAMStream::Rewind()
{
    fBytesRead = 0;
    fPosition = 0;
    fIter.ResetToHead(&fAppender);
}

void hsRAMStream::Truncate()
{
    Reset();
}

uint32_t hsRAMStream::GetEOF()
{
    return fAppender.Count() * fAppender.ElemSize();
}

void hsRAMStream::CopyToMem(void* mem)
{
    (void)fAppender.CopyInto(mem);
}

//////////////////////////////////////////////////////////////////////

uint32_t hsNullStream::Read(uint32_t byteCount, void * buffer)
{
    hsThrow("hsNullStream: Can't read from this stream!");
    return 0;
}

uint32_t hsNullStream::Write(uint32_t byteCount, const void* buffer)
{
    fBytesRead += byteCount;
    fPosition += byteCount;

    return byteCount;
}

void hsNullStream::Skip(uint32_t deltaByteCount)
{
    fBytesRead += deltaByteCount;
    fPosition += deltaByteCount;
}

void hsNullStream::Rewind()
{
    fBytesRead = 0;
    fPosition = 0;
}

void hsNullStream::Truncate()
{
}

/////////////////////////////////////////////////////////////////////////////////

bool hsReadOnlyStream::AtEnd()
{
    return fData >= fStop;
}

uint32_t hsReadOnlyStream::Read(uint32_t byteCount, void* buffer)
{
    if (fData + byteCount > fStop)
    {
        hsThrow("Attempting to read past end of stream");
        byteCount = GetSizeLeft();
    }

    HSMemory::BlockMove(fData, buffer, byteCount);
    fData += byteCount;
    fBytesRead += byteCount;
    fPosition += byteCount;
    return byteCount;
}

uint32_t hsReadOnlyStream::Write(uint32_t byteCount, const void* buffer)
{
    hsThrow( "can't write to a readonly stream");
    return 0;
}

void hsReadOnlyStream::Skip(uint32_t deltaByteCount)
{
    fBytesRead += deltaByteCount;
    fPosition += deltaByteCount;
    fData += deltaByteCount;
    if (fData > fStop)
        hsThrow( "Skip went past end of stream");
}

void hsReadOnlyStream::Rewind()
{
    fBytesRead = 0;
    fPosition = 0;
    fData = fStart;
}

void hsReadOnlyStream::Truncate()
{
    hsThrow( "can't write to a readonly stream");
}

void hsReadOnlyStream::CopyToMem(void* mem)
{
    if (fData < fStop)
        HSMemory::BlockMove(fData, mem, fStop-fData);
}


////////////////////////////////////////////////////////////////////////////////////
uint32_t hsWriteOnlyStream::Read(uint32_t byteCount, void* buffer)
{
    hsThrow( "can't read to a writeonly stream");
    return 0;
}

uint32_t hsWriteOnlyStream::Write(uint32_t byteCount, const void* buffer)
{
    if (fData + byteCount > fStop)
        hsThrow("Write past end of stream");
    HSMemory::BlockMove(buffer, fData, byteCount);
    fData += byteCount;
    fBytesRead += byteCount;
    fPosition += byteCount;
    return byteCount;
}


///////////////////////////////////////////////////////////////////////////////////

hsQueueStream::hsQueueStream(int32_t size) :
    fSize(size),
    fReadCursor(0),
    fWriteCursor(0)
{
    fQueue = new char[fSize];
}

hsQueueStream::~hsQueueStream()
{
    delete [] fQueue;
}

uint32_t hsQueueStream::Read(uint32_t byteCount, void * buffer)
{
    hsAssert(fWriteCursor >= 0 && fWriteCursor < fSize,"hsQueueStream: WriteCursor out of range.");
    hsAssert(fReadCursor >= 0 && fReadCursor < fSize,"hsQueueStream: ReadCursor out of range.");

    int32_t limit, length, total;
    
    limit = fWriteCursor >= fReadCursor ? fWriteCursor : fSize;
    length = hsMinimum(limit-fReadCursor,byteCount);
    HSMemory::BlockMove(fQueue+fReadCursor,buffer,length);
    fReadCursor += length;
    fReadCursor %= fSize;
    total = length;
        
    if (length < byteCount && limit != fWriteCursor)
    {
        limit = fWriteCursor;
        length = hsMinimum(limit,byteCount-length);
        HSMemory::BlockMove(fQueue,static_cast<char*>(buffer)+total,length);
        fReadCursor = length;
        total += length;
    }

    return total;
}

uint32_t hsQueueStream::Write(uint32_t byteCount, const void* buffer)
{
    hsAssert(fWriteCursor >= 0 && fWriteCursor < fSize,"hsQueueStream: WriteCursor out of range.");
    hsAssert(fReadCursor >= 0 && fReadCursor < fSize,"hsQueueStream: ReadCursor out of range.");

    int32_t length;

    length = hsMinimum(fSize-fWriteCursor,byteCount);
    HSMemory::BlockMove(buffer,fQueue+fWriteCursor,length);
    if (fReadCursor > fWriteCursor)
    {
#if 0
        if (fReadCursor < fWriteCursor+length+1)
            hsStatusMessage("ReadCursor wrapped\n");
#endif
        fReadCursor = hsMaximum(fReadCursor,fWriteCursor+length+1);
        fReadCursor %= fSize;
    }
    fWriteCursor += length;
    fWriteCursor %= fSize;

    if (length < byteCount)
    {
        Write(byteCount - length,static_cast<const char*>(buffer)+length);
    }

    return byteCount;
}

void hsQueueStream::Skip(uint32_t deltaByteCount)
{
    int32_t limit, length;
    
    limit = fWriteCursor >= fReadCursor ? fWriteCursor : fSize;
    length = hsMinimum(limit-fReadCursor,deltaByteCount);
    fReadCursor += length;

    if (length < deltaByteCount && limit != fWriteCursor)
    {
        limit = fWriteCursor;
        length = hsMinimum(limit,deltaByteCount-length);
        fReadCursor = length;
    }
    else
    {
        fReadCursor %= fSize;
}
}

void hsQueueStream::Rewind()
{
    fReadCursor = fWriteCursor+1;
    fReadCursor %= fSize;
}

void hsQueueStream::FastFwd()
{
    fReadCursor = fWriteCursor;
}

bool hsQueueStream::AtEnd()
{
    return fReadCursor == fWriteCursor;
}

///////////////////////////////////////////////////////////////////////////////
// hsBufferedStream
///////////////////////////////////////////////////////////////////////////////

inline void FastByteCopy(void* dest, const void* src, uint32_t bytes)
{
    // Don't use memcpy if the read is 4 bytes or less, it's faster to just do a
    // direct copy
    switch (bytes)
    {
    case 4:
        *((uint32_t*)dest) = *((const uint32_t*)src);
        break;
    case 2:
        *((uint16_t*)dest) = *((const uint16_t*)src);
        break;
    case 1:
        *((uint8_t*)dest) = *((const uint8_t*)src);
        break;
    default:
        memcpy(dest, src, bytes);
    }
}

//#define LOG_BUFFERED

hsBufferedStream::hsBufferedStream()
: fRef(nil)
, fFileSize(0)
, fBufferLen(0)
, fWriteBufferUsed(false)
#ifdef HS_DEBUGGING
, fBufferHits(0)
, fBufferMisses(0)
, fBufferReadIn(0)
, fBufferReadOut(0)
, fReadDirect(0)
, fLastReadPos(0)
, fCloseReason(nil)
#endif
{
}

bool hsBufferedStream::Open(const plFileName& name, const char* mode)
{
    hsAssert(!fRef, "hsBufferedStream:Open Stream already opened");
    fRef = plFileSystem::Open(name, mode);
    if (!fRef)
        return false;

    SetFileRef(fRef);

#ifdef LOG_BUFFERED
    fBufferHits = fBufferMisses = 0;
    fBufferReadIn = fBufferReadOut = fReadDirect = fLastReadPos = 0;
    fFilename = name;
    fCloseReason = nil;
#endif // LOG_BUFFERED

    return true;
}

bool hsBufferedStream::Close()
{
    int rtn = true;
    if (fRef)
        rtn = fclose(fRef);
    fRef = nil;

#ifdef LOG_BUFFERED
    hsUNIXStream s;
    static bool firstClose = true;
    if (firstClose)
    {
        firstClose = false;
        s.Open("log\\BufferedStream.csv", "wt");
        s.WriteString("File,Hits,Misses,Read In,Read Out,Read Direct,% Wasted,Reason\n");
    }
    else
        s.Open("log\\BufferedStream.csv", "at");

    int wasted = 100;
    if (fBufferReadIn + fReadDirect > 0)
        wasted -= int((float(fBufferReadOut+fReadDirect) / float(fBufferReadIn+fReadDirect)) * 100.f);

    s.WriteFmt("%s,%d,%d,%u,%u,%u,%d,%s\n",
        fFilename.c_str(), fBufferHits, fBufferMisses, fBufferReadIn, fBufferReadOut, fReadDirect,
        wasted,
        fCloseReason ? fCloseReason : "Unknown");

    s.Close();
#endif // LOG_BUFFERED

    return !rtn;
}

FILE* hsBufferedStream::GetFileRef()
{
    return fRef;
}

void hsBufferedStream::SetFileRef(FILE* ref)
{
    hsAssert(ref, "bad ref");
    fRef = ref;

    fseek(fRef, 0, SEEK_END);
    fFileSize = ftell(fRef);
    fseek(fRef, 0, SEEK_SET);

    fBufferLen = 0;
    fPosition = 0;
    fWriteBufferUsed = false;
}

uint32_t hsBufferedStream::Read(uint32_t bytes, void* buffer)
{
    hsAssert(fRef, "fRef uninitialized");
    if (!fRef || bytes == 0)
        return 0;

    uint32_t numReadBytes = 0;

    while (bytes > 0 && fPosition < fFileSize)
    {
        // First, see if we've got anything in the buffer
        if (fBufferLen > 0)
        {
            // Figure out how much we can copy out of the buffer
            uint32_t bufferPos = fPosition % kBufferSize;
            uint32_t bytesInBuffer = fBufferLen - bufferPos;
            uint32_t cachedReadSize = bytesInBuffer < bytes ? bytesInBuffer : bytes;

            FastByteCopy(buffer, &fBuffer[bufferPos], cachedReadSize);

            fPosition += cachedReadSize;
            numReadBytes += cachedReadSize;
            bytes -= cachedReadSize;
            buffer = (void*)(((char*)buffer) + cachedReadSize);

            // If we read all the data out of the buffer, set it to empty
            if ((bufferPos + cachedReadSize) == fBufferLen)
                fBufferLen = 0;

#ifdef HS_DEBUGGING
            fLastReadPos = fPosition;
            fBufferHits++;
            fBufferReadOut += cachedReadSize;
#endif
        }

        // Now see if the remaining read (if any) is the size of the buffer or larger.
        // If it is, read as many complete blocks as possible directly into the output buffer.
        if (bytes >= kBufferSize && fPosition % kBufferSize == 0)
        {
            uint32_t directReadSize = bytes - (bytes % kBufferSize);
            hsAssert(ftell(fRef) % kBufferSize == 0 , "read buffer is not in alignment.");
            int amtRead = ::fread(buffer, 1, directReadSize, fRef);
            fPosition += amtRead;
            numReadBytes += amtRead;
            bytes -= amtRead;
            buffer = (void*)(((char*)buffer) + amtRead);
#ifdef HS_DEBUGGING
            fLastReadPos = fPosition;
            fReadDirect += directReadSize;
#endif
        }

        // If we've got bytes left to read and we didn't pass the end of the file, buffer a new block
        if (bytes > 0 && fPosition < fFileSize)
        {
            hsAssert(ftell(fRef) % kBufferSize == 0 , "read buffer is not in alignment.");
            fBufferLen = ::fread(fBuffer, 1, kBufferSize, fRef);

#ifdef HS_DEBUGGING
            // If our last read wasn't at the start of the new buffer, it's a miss.
            if (fLastReadPos != fPosition)
            {
                fBufferMisses++;
                fBufferHits--;
            }

            fBufferReadIn += fBufferLen;
#endif
        }
    }

    return numReadBytes;
}

uint32_t hsBufferedStream::Write(uint32_t bytes, const void* buffer)
{
    hsAssert(fRef, "fRef uninitialized");
    fWriteBufferUsed = true;
    int amtWritten = fwrite((void*)buffer, 1, bytes, fRef);
    fPosition += amtWritten;
    return amtWritten;
}

bool hsBufferedStream::AtEnd()
{
    if (fWriteBufferUsed)
    {
        if (!fRef)
            return true;
        bool rVal;
        int x = getc(fRef);
        rVal = feof(fRef) != 0;
        ungetc(x, fRef);
        return rVal;
    }
    else
    {
        // buffered read
        return fPosition >= fFileSize;
    }
}

void hsBufferedStream::Skip(uint32_t delta)
{
    if (fWriteBufferUsed)
    {
        // buffered write not implemented yet.
        fseek(fRef, delta, SEEK_CUR);
    }
    else
    {
        uint32_t blockStart = ((fPosition + delta) / kBufferSize) * kBufferSize;

        // We've got data in the buffer, see if we can just skip in that
        if (fBufferLen > 0)
        {
            int32_t newBufferPos = int32_t(fPosition % kBufferSize) + int32_t(delta);

            // If we skipped outside of our buffer, invalidate it
            if (newBufferPos < 0 || uint32_t(newBufferPos) >= fBufferLen)
            {
                fBufferLen = 0;
                fseek(fRef, blockStart, SEEK_SET);
            }
        }
        else
            fseek(fRef, blockStart, SEEK_SET);
    }

    fPosition += delta;
}

void hsBufferedStream::Rewind()
{
    if (fWriteBufferUsed)
    {
        // buffered write not implemented yet.
        fseek(fRef, 0, SEEK_SET);
    }
    // If the currently buffered block isn't the first one, invalidate our buffer
    else if (fPosition >= kBufferSize)
        fBufferLen = 0;

    fPosition = 0;
}

uint32_t hsBufferedStream::GetEOF()
{
    if (fWriteBufferUsed)
    {
        if (!fRef)
            return 0;

        long oldPos = ftell(fRef);
        fseek(fRef, 0, SEEK_END);
        uint32_t end = (uint32_t)ftell(fRef);
        fseek(fRef, oldPos, SEEK_SET);

        return end;
    }
    else
        return fFileSize;
}

void hsBufferedStream::Truncate()
{
    hsAssert(0, "hsBufferedStream::Truncate unimplemented");
}