CMSZipCodec Class Reference

#include <mszip.h>

Inheritance diagram for CMSZipCodec:

Collaboration diagram for CMSZipCodec:

Public Member Functions
	CMSZipCodec ()
virtual	~CMSZipCodec ()
virtual ULONG	Compress (void *OutputBuffer, void *InputBuffer, ULONG InputLength, PULONG OutputLength) override
virtual ULONG	Uncompress (void *OutputBuffer, void *InputBuffer, ULONG InputLength, PULONG OutputLength) override
Public Member Functions inherited from CCABCodec
	CCABCodec ()
virtual	~CCABCodec ()
virtual ULONG	Compress (void *OutputBuffer, void *InputBuffer, ULONG InputLength, PULONG OutputLength)=0
virtual ULONG	Uncompress (void *OutputBuffer, void *InputBuffer, ULONG InputLength, PULONG OutputLength)=0

Private Attributes
int	Status
z_stream	ZStream

Detailed Description

Definition at line 18 of file mszip.h.

Constructor & Destructor Documentation

CMSZipCodec()

CMSZipCodec::CMSZipCodec

(

)

Definition at line 36 of file mszip.cxx.

{
    ZStream.zalloc = MSZipAlloc;
    ZStream.zfree  = MSZipFree;
    ZStream.opaque = (voidpf)0;
}

~CMSZipCodec()

CMSZipCodec::~CMSZipCodec ( )

virtual

Definition at line 47 of file mszip.cxx.

{
}

Member Function Documentation

Compress()

ULONG CMSZipCodec::Compress ( void *  OutputBuffer, void *  InputBuffer, ULONG  InputLength, PULONG  OutputLength  )

overridevirtual

Implements CCABCodec.

Definition at line 55 of file mszip.cxx.

{
    PUSHORT Magic;
 
    DPRINT(MAX_TRACE, ("InputLength (%u).\n", (UINT)InputLength));
 
    Magic  = (PUSHORT)OutputBuffer;
    *Magic = MSZIP_MAGIC;
 
    ZStream.next_in   = (unsigned char*)InputBuffer;
    ZStream.avail_in  = InputLength;
    ZStream.next_out  = ((unsigned char *)OutputBuffer + 2);
    ZStream.avail_out = CAB_BLOCKSIZE + 12;
 
    /* WindowBits is passed < 0 to tell that there is no zlib header */
    Status = deflateInit2(&ZStream,
                          Z_DEFAULT_COMPRESSION,
                          Z_DEFLATED,
                          -MAX_WBITS,
                          8, /* memLevel */
                          Z_DEFAULT_STRATEGY);
    if (Status != Z_OK)
    {
        DPRINT(MIN_TRACE, ("deflateInit() returned (%d).\n", Status));
        return CS_NOMEMORY;
    }
 
    Status = deflate(&ZStream, Z_FINISH);
    if ((Status != Z_OK) && (Status != Z_STREAM_END))
    {
        DPRINT(MIN_TRACE, ("deflate() returned (%d) (%s).\n", Status, ZStream.msg));
        if (Status == Z_MEM_ERROR)
            return CS_NOMEMORY;
        return CS_BADSTREAM;
    }
 
    *OutputLength = ZStream.total_out + 2;
 
    Status = deflateEnd(&ZStream);
    if (Status != Z_OK)
    {
        DPRINT(MIN_TRACE, ("deflateEnd() returned (%d).\n", Status));
        return CS_BADSTREAM;
    }
 
    return CS_SUCCESS;
}

Uncompress()

ULONG CMSZipCodec::Uncompress ( void *  OutputBuffer, void *  InputBuffer, ULONG  InputLength, PULONG  OutputLength  )

overridevirtual

Implements CCABCodec.

Definition at line 115 of file mszip.cxx.

{
    USHORT Magic;
 
    DPRINT(MAX_TRACE, ("InputLength (%u).\n", (UINT)InputLength));
 
    Magic = *((PUSHORT)InputBuffer);
 
    if (Magic != MSZIP_MAGIC)
    {
        DPRINT(MID_TRACE, ("Bad MSZIP block header magic (0x%X)\n", Magic));
        return CS_BADSTREAM;
    }
 
    ZStream.next_in   = ((unsigned char*)InputBuffer + 2);
    ZStream.avail_in  = InputLength - 2;
    ZStream.next_out  = (unsigned char*)OutputBuffer;
    ZStream.avail_out = CAB_BLOCKSIZE + 12;
 
    /* WindowBits is passed < 0 to tell that there is no zlib header.
     * Note that in this case inflate *requires* an extra "dummy" byte
     * after the compressed stream in order to complete decompression and
     * return Z_STREAM_END.
     */
    Status = inflateInit2(&ZStream, -MAX_WBITS);
    if (Status != Z_OK)
    {
        DPRINT(MIN_TRACE, ("inflateInit2() returned (%d).\n", Status));
        return CS_BADSTREAM;
    }
 
    while ((ZStream.total_out < CAB_BLOCKSIZE + 12) &&
        (ZStream.total_in < InputLength - 2))
    {
        Status = inflate(&ZStream, Z_NO_FLUSH);
        if (Status == Z_STREAM_END) break;
        if (Status != Z_OK)
        {
            DPRINT(MIN_TRACE, ("inflate() returned (%d) (%s).\n", Status, ZStream.msg));
            if (Status == Z_MEM_ERROR)
                return CS_NOMEMORY;
            return CS_BADSTREAM;
        }
    }
 
    *OutputLength = ZStream.total_out;
 
    Status = inflateEnd(&ZStream);
    if (Status != Z_OK)
    {
        DPRINT(MIN_TRACE, ("inflateEnd() returned (%d).\n", Status));
        return CS_BADSTREAM;
    }
    return CS_SUCCESS;
}

Member Data Documentation

Status

int CMSZipCodec::Status

private

Definition at line 36 of file mszip.h.

ZStream

z_stream CMSZipCodec::ZStream

private

Definition at line 37 of file mszip.h.

Referenced by CMSZipCodec(), Compress(), and Uncompress().

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The documentation for this class was generated from the following files:

• sdk/tools/cabman/mszip.h
• sdk/tools/cabman/mszip.cxx