ipmsg365src 问题修复

在src\recvdlg.cpp文件里，函数BOOL TRcvDlg::RecvDirFile(void)中存在一个bug，该bug导致自动接收时，接收文件体积大小的门限值乘积产生溢出，不对过大的文件进行接收；需要做如下修改：

BOOL TRecvDlg::RecvDirFile(void)
{
#define PEEK_SIZE   8

if (fileObj->status == FS_DIRFILESTART || fileObj->status == FS_TRANSINFO) {
int     size;
if (fileObj->infoLen == 0) {
if ((size = ::recv(fileObj->conInfo->sd, fileObj->info + (int)fileObj->offset,
PEEK_SIZE - (int)fileObj->offset, 0)) <= 0) {
return  FALSE;
}
if (fileObj->aes.IsKeySet()) {
fileObj->aes.DecryptCTR((const BYTE *)fileObj->info + (int)fileObj->offset,
(BYTE *)fileObj->info + (int)fileObj->offset, size);
}
if ((fileObj->offset += size) < PEEK_SIZE) {
return  TRUE;
}
fileObj->info[fileObj->offset] = 0;
fileObj->infoLen = strtoul(fileObj->info, 0, 16);
if (fileObj->infoLen >= sizeof(fileObj->info) -1 || fileObj->infoLen <= 0) {
return  FALSE;  // too big or small
}
}
if (fileObj->offset < fileObj->infoLen) {
if ((size = ::recv(fileObj->conInfo->sd, fileObj->info + (int)fileObj->offset,
fileObj->infoLen - (int)fileObj->offset, 0)) <= 0) {
return  FALSE;
}
if (fileObj->aes.IsKeySet()) {
fileObj->aes.DecryptCTR((const BYTE *)fileObj->info + (int)fileObj->offset,
(BYTE *)fileObj->info + (int)fileObj->offset, size);
}
fileObj->offset += size;
}
if (fileObj->offset == fileObj->infoLen) {
fileObj->info[fileObj->infoLen] = 0;
if (!DecodeDirEntry(fileObj->info, &fileObj->curFileInfo,
fileObj->isDir ? fileObj->u8fname : NULL)) {
return  FALSE;  // Illegal entry
}
if (isAutoSave) {
if (fileObj->totalTrans + fileObj->curFileInfo.Size() >
(int64)cfg->autoSaveMax * 1000 * 1000) return FALSE;    // 添加(int64)
}

fileObj->offset = fileObj->infoLen = 0; // 初期化
DWORD   attr = fileObj->curFileInfo.Attr();

if (GET_MODE(attr) == IPMSG_FILE_DIR) {
char    buf[MAX_BUF];
const char *fname = (fileObj->dirCnt == 0) ?
fileObj->fileInfo->Fname() : fileObj->curFileInfo.Fname();

if (!fileObj->isDir) return FALSE;

if (MakePath(buf, fileObj->path, fname) >= MAX_PATH_U8) {
MessageBoxU8(buf, GetLoadStrU8(IDS_PATHTOOLONG));
return  FALSE;
}
if (!IsSafePath(buf, fname)) {
return  FALSE;
}
if (!CreateDirectoryU8(buf, NULL)) {
return  FALSE;
}
strncpyz(fileObj->path, buf, MAX_PATH_U8);
fileObj->dirCnt++;
}
else if (GET_MODE(attr) == IPMSG_FILE_RETPARENT) {
if (!fileObj->isDir) return FALSE;

if (fileObj->curFileInfo.Mtime()) { // directory の time stamp をあわせる(NT系のみ)
FILETIME    ft;
HANDLE      hFile;
UnixTime2FileTime(fileObj->curFileInfo.Mtime(), &ft);
if ((hFile = CreateFileU8(fileObj->path, GENERIC_WRITE, FILE_SHARE_READ, 0,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0)) != INVALID_HANDLE_VALUE) {
::SetFileTime(hFile, NULL, NULL, &ft);
::CloseHandle(hFile);
}
}
if (fileObj->curFileInfo.Attr() & IPMSG_FILE_RONLYOPT) {
SetFileAttributesU8(fileObj->path, FILE_ATTRIBUTE_READONLY);
}
if (--fileObj->dirCnt <= 0) {
fileObj->status = FS_COMPLETE;
return  TRUE;
}
if (!GetParentDirU8(fileObj->path, fileObj->path)) {
return  FALSE;
}
}
else {
if (fileObj->isDir && fileObj->dirCnt == 0) {
return  FALSE;
}
if (fileObj->curFileInfo.Size() == 0) { // 0byte file
if (OpenRecvFile()) {   // 0byteの場合は作成失敗を無視
CloseRecvFile(TRUE);
}
if (!fileObj->isDir) {
fileObj->status = FS_COMPLETE;
return TRUE;
}
}
fileObj->status = fileObj->curFileInfo.Size() ? FS_TRANSFILE : FS_TRANSINFO;
}
return  TRUE;
}
}

if (fileObj->status == FS_TRANSFILE) {
if (!RecvFile()) {
CloseRecvFile();
return  FALSE;
}
if (fileObj->status == FS_ENDFILE || fileObj->status == FS_COMPLETE) {
CloseRecvFile(TRUE);
if (!fileObj->isDir) return TRUE;
fileObj->status = FS_TRANSINFO;
}
}

return  TRUE;
}