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 pos;
pos.QuadPart = offset;
if (!MySetFilePointerEx(hFile, pos, NULL, FILE_CURRENT)) {
DWORD dwErr = GetLastError();
((WIN32FILE_IOWIN *)stream) -> error = (int)dwErr;
ret = -1;
} else {
ret = 0;
}
}
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 pos;
pos.QuadPart = 0;
if (!MySetFilePointerEx(hFile, pos, &pos, FILE_CURRENT)) {
DWORD dwErr = GetLastError();
((WIN32FILE_IOWIN *)stream) -> error = (int)dwErr;
ret = (ZPOS64_T) - 1;
} else {
ret = pos.QuadPart;
}
}
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)
{
LARGE_INTEGER pos;
pos.QuadPart = 0;
if (!MySetFilePointerEx(hFile, pos, &pos, FILE_CURRENT))
{
DWORD dwErr = GetLastError();
((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
ret = -1;
}
else
ret=(long)pos.LowPart;
}
return ret;
}
