/* iowin32.c -- IO base function header for compress/uncompress .zip
     Version 1.1, January 7th, 2010
     part of the MiniZip project - ( http://www.winimage.com/zLibDll/minizip.html )

	 Copyright (C) 1998-2010 Gilles Vollant (minizip) ( http://www.winimage.com/zLibDll/minizip.html )

	 Modifications for Zip64 support
	 Copyright (C) 2009-2010 Mathias Svensson ( http://result42.com )

     For more info read MiniZip_info.txt

*/

#include <stdlib.h>

#include "zlib.h"
#include "ioapi.h"
#include "iowin32.h"

#ifndef INVALID_HANDLE_VALUE
#define INVALID_HANDLE_VALUE (0xFFFFFFFF)
#endif

#ifndef INVALID_SET_FILE_POINTER
#define INVALID_SET_FILE_POINTER ((DWORD)-1)
#endif

voidpf  ZCALLBACK win32_open_file_func  OF((voidpf opaque, const char* filename, int mode));
uLong   ZCALLBACK win32_read_file_func  OF((voidpf opaque, voidpf stream, void* buf, uLong size));
uLong   ZCALLBACK win32_write_file_func OF((voidpf opaque, voidpf stream, const void* buf, uLong size));
ZPOS64_T ZCALLBACK win32_tell64_file_func  OF((voidpf opaque, voidpf stream));
long    ZCALLBACK win32_seek64_file_func  OF((voidpf opaque, voidpf stream, ZPOS64_T offset, int origin));
int     ZCALLBACK win32_close_file_func OF((voidpf opaque, voidpf stream));
int     ZCALLBACK win32_error_file_func OF((voidpf opaque, voidpf stream));

typedef struct
{
    HANDLE hf;
    int error;
} WIN32FILE_IOWIN;


static void win32_translate_open_mode(int mode,
                                      DWORD* lpdwDesiredAccess,
                                      DWORD* lpdwCreationDisposition,
                                      DWORD* lpdwShareMode,
                                      DWORD* lpdwFlagsAndAttributes)
{
    *lpdwDesiredAccess = *lpdwShareMode = *lpdwFlagsAndAttributes = *lpdwCreationDisposition = 0;

    if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
    {
        *lpdwDesiredAccess = GENERIC_READ;
        *lpdwCreationDisposition = OPEN_EXISTING;
        *lpdwShareMode = FILE_SHARE_READ;
    }
    else if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
    {
        *lpdwDesiredAccess = GENERIC_WRITE | GENERIC_READ;
        *lpdwCreationDisposition = OPEN_EXISTING;
    }
    else if (mode & ZLIB_FILEFUNC_MODE_CREATE)
    {
        *lpdwDesiredAccess = GENERIC_WRITE | GENERIC_READ;
        *lpdwCreationDisposition = CREATE_ALWAYS;
    }
}

static voidpf win32_build_iowin(HANDLE hFile)
{
    voidpf ret=NULL;

    if ((hFile != NULL) && (hFile != INVALID_HANDLE_VALUE))
    {
        WIN32FILE_IOWIN w32fiow;
        w32fiow.hf = hFile;
        w32fiow.error = 0;
        ret = malloc(sizeof(WIN32FILE_IOWIN));

        if (ret==NULL)
            CloseHandle(hFile);
        else
            *((WIN32FILE_IOWIN*)ret) = w32fiow;
    }
    return ret;
}

voidpf ZCALLBACK win32_open64_file_func (voidpf opaque,const void* filename,int mode)
{
    const char* mode_fopen = NULL;
    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
    HANDLE hFile = NULL;

    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);

    if ((filename!=NULL) && (dwDesiredAccess != 0))
        hFile = CreateFile((LPCTSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);

    return win32_build_iowin(hFile);
}


voidpf ZCALLBACK win32_open64_file_funcA (voidpf opaque,const void* filename,int mode)
{
    const char* mode_fopen = NULL;
    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
    HANDLE hFile = NULL;

    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);

    if ((filename!=NULL) && (dwDesiredAccess != 0))
        hFile = CreateFileA((LPCSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);

    return win32_build_iowin(hFile);
}


voidpf ZCALLBACK win32_open64_file_funcW (voidpf opaque,const void* filename,int mode)
{
    const char* mode_fopen = NULL;
    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
    HANDLE hFile = NULL;

    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);

    if ((filename!=NULL) && (dwDesiredAccess != 0))
        hFile = CreateFileW((LPCWSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);

    return win32_build_iowin(hFile);
}


voidpf ZCALLBACK win32_open_file_func (voidpf opaque,const char* filename,int mode)
{
    const char* mode_fopen = NULL;
    DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
    HANDLE hFile = NULL;

    win32_translate_open_mode(mode,&dwDesiredAccess,&dwCreationDisposition,&dwShareMode,&dwFlagsAndAttributes);

    if ((filename!=NULL) && (dwDesiredAccess != 0))
        hFile = CreateFile((LPCTSTR)filename, dwDesiredAccess, dwShareMode, NULL, dwCreationDisposition, dwFlagsAndAttributes, NULL);

    return win32_build_iowin(hFile);
}


uLong ZCALLBACK win32_read_file_func (voidpf opaque, voidpf stream, void* buf,uLong size)
{
    uLong ret=0;
    HANDLE hFile = NULL;
    if (stream!=NULL)
        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;

    if (hFile != NULL)
    {
        if (!ReadFile(hFile, buf, size, &ret, NULL))
        {
            DWORD dwErr = GetLastError();
            if (dwErr == ERROR_HANDLE_EOF)
                dwErr = 0;
            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
        }
    }

    return ret;
}


uLong ZCALLBACK win32_write_file_func (voidpf opaque,voidpf stream,const void* buf,uLong size)
{
    uLong ret=0;
    HANDLE hFile = NULL;
    if (stream!=NULL)
        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;

    if (hFile != NULL)
    {
        if (!WriteFile(hFile, buf, size, &ret, NULL))
        {
            DWORD dwErr = GetLastError();
            if (dwErr == ERROR_HANDLE_EOF)
                dwErr = 0;
            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
        }
    }

    return ret;
}

long ZCALLBACK win32_tell_file_func (voidpf opaque,voidpf stream)
{
    long ret=-1;
    HANDLE hFile = NULL;
    if (stream!=NULL)
        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
    if (hFile != NULL)
    {
        DWORD dwSet = SetFilePointer(hFile, 0, NULL, FILE_CURRENT);
        if (dwSet == INVALID_SET_FILE_POINTER)
        {
            DWORD dwErr = GetLastError();
            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
            ret = -1;
        }
        else
            ret=(long)dwSet;
    }
    return ret;
}

ZPOS64_T ZCALLBACK win32_tell64_file_func (voidpf opaque, voidpf stream)
{
    ZPOS64_T ret= (ZPOS64_T)-1;
    HANDLE hFile = NULL;
    if (stream!=NULL)
        hFile = ((WIN32FILE_IOWIN*)stream)->hf;

    if (hFile)
    {
        LARGE_INTEGER li;
        li.QuadPart = 0;
        li.u.LowPart = SetFilePointer(hFile, li.u.LowPart, &li.u.HighPart, FILE_CURRENT);
        if ( (li.LowPart == 0xFFFFFFFF) && (GetLastError() != NO_ERROR))
        {
            DWORD dwErr = GetLastError();
            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
            ret = (ZPOS64_T)-1;
        }
        else
            ret=li.QuadPart;
    }
    return ret;
}


long ZCALLBACK win32_seek_file_func (voidpf opaque,voidpf stream,uLong offset,int origin)
{
    DWORD dwMoveMethod=0xFFFFFFFF;
    HANDLE hFile = NULL;

    long ret=-1;
    if (stream!=NULL)
        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
    switch (origin)
    {
    case ZLIB_FILEFUNC_SEEK_CUR :
        dwMoveMethod = FILE_CURRENT;
        break;
    case ZLIB_FILEFUNC_SEEK_END :
        dwMoveMethod = FILE_END;
        break;
    case ZLIB_FILEFUNC_SEEK_SET :
        dwMoveMethod = FILE_BEGIN;
        break;
    default: return -1;
    }

    if (hFile != NULL)
    {
        DWORD dwSet = SetFilePointer(hFile, offset, NULL, dwMoveMethod);
        if (dwSet == INVALID_SET_FILE_POINTER)
        {
            DWORD dwErr = GetLastError();
            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
            ret = -1;
        }
        else
            ret=0;
    }
    return ret;
}

long ZCALLBACK win32_seek64_file_func (voidpf opaque, voidpf stream,ZPOS64_T offset,int origin)
{
    DWORD dwMoveMethod=0xFFFFFFFF;
    HANDLE hFile = NULL;
    long ret=-1;

    if (stream!=NULL)
        hFile = ((WIN32FILE_IOWIN*)stream)->hf;

    switch (origin)
    {
        case ZLIB_FILEFUNC_SEEK_CUR :
            dwMoveMethod = FILE_CURRENT;
            break;
        case ZLIB_FILEFUNC_SEEK_END :
            dwMoveMethod = FILE_END;
            break;
        case ZLIB_FILEFUNC_SEEK_SET :
            dwMoveMethod = FILE_BEGIN;
            break;
        default: return -1;
    }

    if (hFile)
    {
        LARGE_INTEGER* li = (LARGE_INTEGER*)&offset;
        DWORD dwSet = SetFilePointer(hFile, li->u.LowPart, &li->u.HighPart, dwMoveMethod);
        if (dwSet == INVALID_SET_FILE_POINTER)
        {
            DWORD dwErr = GetLastError();
            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
            ret = -1;
        }
        else
            ret=0;
    }
    return ret;
}

int ZCALLBACK win32_close_file_func (voidpf opaque, voidpf stream)
{
    int ret=-1;

    if (stream!=NULL)
    {
        HANDLE hFile;
        hFile = ((WIN32FILE_IOWIN*)stream) -> hf;
        if (hFile != NULL)
        {
            CloseHandle(hFile);
            ret=0;
        }
        free(stream);
    }
    return ret;
}

int ZCALLBACK win32_error_file_func (voidpf opaque,voidpf stream)
{
    int ret=-1;
    if (stream!=NULL)
    {
        ret = ((WIN32FILE_IOWIN*)stream) -> error;
    }
    return ret;
}

void fill_win32_filefunc (zlib_filefunc_def* pzlib_filefunc_def)
{
    pzlib_filefunc_def->zopen_file = win32_open_file_func;
    pzlib_filefunc_def->zread_file = win32_read_file_func;
    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
    pzlib_filefunc_def->ztell_file = win32_tell_file_func;
    pzlib_filefunc_def->zseek_file = win32_seek_file_func;
    pzlib_filefunc_def->zclose_file = win32_close_file_func;
    pzlib_filefunc_def->zerror_file = win32_error_file_func;
    pzlib_filefunc_def->opaque = NULL;
}

void fill_win32_filefunc64(zlib_filefunc64_def* pzlib_filefunc_def)
{
    pzlib_filefunc_def->zopen64_file = win32_open64_file_func;
    pzlib_filefunc_def->zread_file = win32_read_file_func;
    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
    pzlib_filefunc_def->ztell64_file = win32_tell64_file_func;
    pzlib_filefunc_def->zseek64_file = win32_seek64_file_func;
    pzlib_filefunc_def->zclose_file = win32_close_file_func;
    pzlib_filefunc_def->zerror_file = win32_error_file_func;
    pzlib_filefunc_def->opaque = NULL;
}


void fill_win32_filefunc64A(zlib_filefunc64_def* pzlib_filefunc_def)
{
    pzlib_filefunc_def->zopen64_file = win32_open64_file_funcA;
    pzlib_filefunc_def->zread_file = win32_read_file_func;
    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
    pzlib_filefunc_def->ztell64_file = win32_tell64_file_func;
    pzlib_filefunc_def->zseek64_file = win32_seek64_file_func;
    pzlib_filefunc_def->zclose_file = win32_close_file_func;
    pzlib_filefunc_def->zerror_file = win32_error_file_func;
    pzlib_filefunc_def->opaque = NULL;
}


void fill_win32_filefunc64W(zlib_filefunc64_def* pzlib_filefunc_def)
{
    pzlib_filefunc_def->zopen64_file = win32_open64_file_funcW;
    pzlib_filefunc_def->zread_file = win32_read_file_func;
    pzlib_filefunc_def->zwrite_file = win32_write_file_func;
    pzlib_filefunc_def->ztell64_file = win32_tell64_file_func;
    pzlib_filefunc_def->zseek64_file = win32_seek64_file_func;
    pzlib_filefunc_def->zclose_file = win32_close_file_func;
    pzlib_filefunc_def->zerror_file = win32_error_file_func;
    pzlib_filefunc_def->opaque = NULL;
}