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/* iowin32.c -- IO base function header for compress/uncompress .zip
files using zlib + zip or unzip API
This IO API version uses the Win32 API (for Microsoft Windows)
Version 1.01e, February 12th, 2005
Copyright (C) 1998-2005 Gilles Vollant
*/
#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));
long ZCALLBACK win32_tell_file_func OF((
voidpf opaque,
voidpf stream));
long ZCALLBACK win32_seek_file_func OF((
voidpf opaque,
voidpf stream,
uLong 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;
voidpf ZCALLBACK win32_open_file_func (opaque, filename, mode)
voidpf opaque;
const char* filename;
int mode;
{
DWORD dwDesiredAccess,dwCreationDisposition,dwShareMode,dwFlagsAndAttributes ;
HANDLE hFile = 0;
voidpf ret=NULL;
dwDesiredAccess = dwShareMode = dwFlagsAndAttributes = 0;
if ((mode & ZLIB_FILEFUNC_MODE_READWRITEFILTER)==ZLIB_FILEFUNC_MODE_READ)
{
dwDesiredAccess = GENERIC_READ;
dwCreationDisposition = OPEN_EXISTING;
dwShareMode = FILE_SHARE_READ;
}
else
if (mode & ZLIB_FILEFUNC_MODE_EXISTING)
{
dwDesiredAccess = GENERIC_WRITE | GENERIC_READ;
dwCreationDisposition = OPEN_EXISTING;
}
else
if (mode & ZLIB_FILEFUNC_MODE_CREATE)
{
dwDesiredAccess = GENERIC_WRITE | GENERIC_READ;
dwCreationDisposition = CREATE_ALWAYS;
}
if ((filename!=NULL) && (dwDesiredAccess != 0))
hFile = CreateFile((LPCTSTR)filename, dwDesiredAccess, dwShareMode, NULL,
dwCreationDisposition, dwFlagsAndAttributes, NULL);
if (hFile == INVALID_HANDLE_VALUE)
hFile = NULL;
if (hFile != NULL)
{
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;
}
uLong ZCALLBACK win32_read_file_func (opaque, stream, buf, size)
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 (opaque, stream, buf, size)
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 (opaque, stream)
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;
}
long ZCALLBACK win32_seek_file_func (opaque, stream, offset, origin)
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;
}
int ZCALLBACK win32_close_file_func (opaque, stream)
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 (opaque, stream)
voidpf opaque;
voidpf stream;
{
int ret=-1;
if (stream!=NULL)
{
ret = ((WIN32FILE_IOWIN*)stream) -> error;
}
return ret;
}
void fill_win32_filefunc (pzlib_filefunc_def)
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;
}
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