C++ Istream类代码示例

Foam::autoPtr<Foam::entry> Foam::entry::New(Istream& is)
{
    is.fatalCheck("entry::New(Istream&)");

    keyType keyword;

    // Get the next keyword and if invalid return false
    if (!getKeyword(keyword, is))
    {
        return autoPtr<entry>(NULL);
    }
    else // Keyword starts entry ...
    {
        token nextToken(is);
        is.putBack(nextToken);

        if (nextToken == token::BEGIN_BLOCK)
        {
            return autoPtr<entry>
            (
                new dictionaryEntry(keyword, dictionary::null, is)
            );
        }
        else
        {
            return autoPtr<entry>
            (
                new primitiveEntry(keyword, is)
            );
        }
    }
}

void Foam::functionEntries::ifeqEntry::skipUntil
(
    DynamicList<filePos>& stack,
    const dictionary& parentDict,
    const word& endWord,
    Istream& is
)
{
    while (!is.eof())
    {
        token t;
        readToken(t, is);
        if (t.isWord())
        {
            if (t.wordToken() == "#if" || t.wordToken() == "#ifeq")
            {
                stack.append(filePos(is.name(), is.lineNumber()));
                skipUntil(stack, parentDict, "#endif", is);
                stack.remove();
            }
            else if (t.wordToken() == endWord)
            {
                return;
            }
        }
    }

    FatalIOErrorInFunction(parentDict)
        << "Did not find matching " << endWord << exit(FatalIOError);
}

// from Istream
blockDescriptor::blockDescriptor
(
    const pointField& blockMeshPoints,
    const curvedEdgeList& edges,
    Istream& is
)
    :
    blockMeshPoints_(blockMeshPoints),
    blockShape_(is),
    curvedEdges_(edges),
    edgePoints_(12),
    edgeWeights_(12),
    n_(),
    expand_(12),
    zoneName_()
{
    // Look at first token
    token t(is);
    is.putBack(t);

    // Optional zone name
    if (t.isWord())
    {
        zoneName_ = t.wordToken();

        // Consume zoneName token
        is >> t;

        // New look-ahead
        is >> t;
        is.putBack(t);
    }

void Foam::primitiveEntry::readEntry(const dictionary& dict, Istream& is)
{
    label keywordLineNumber = is.lineNumber();
    tokenIndex() = 0;

    if (read(dict, is))
    {
        setSize(tokenIndex());
        tokenIndex() = 0;
    }
    else
    {
        std::ostringstream os;
        os  << "ill defined primitiveEntry starting at keyword '"
            << keyword() << '\''
            << " on line " << keywordLineNumber
            << " and ending at line " << is.lineNumber();

        SafeFatalIOErrorIn
        (
            "primitiveEntry::readEntry(const dictionary&, Istream&)",
            is,
            os.str()
        );
    }
}

Foam::WetParcel<ParcelType>::WetParcel
(
    const polyMesh& mesh,
    Istream& is,
    bool readFields
)
:
    ParcelType(mesh, is, readFields),
    Vliq_(0.0)
{
    if (readFields)
    {
        if (is.format() == IOstream::ASCII)
        {
            Vliq_ = readScalar(is);
        }
        else
        {
            is.read
            (
                reinterpret_cast<char*>(&Vliq_),
                sizeof(Vliq_)
            );
        }
    }

    // Check state of Istream
    is.check
    (
        "WetParcel<ParcelType>::WetParcel"
        "(const polyMesh&, Istream&, bool)"
    );
}

bool Foam::functionEntries::codeStream::execute
(
    const dictionary& parentDict,
    primitiveEntry& entry,
    Istream& is
)
{
    Info<< "Using #codeStream at line " << is.lineNumber()
        << " in file " <<  parentDict.name() << endl;

    dynamicCode::checkSecurity
    (
        "functionEntries::codeStream::execute(..)",
        parentDict
    );

    // get code dictionary
    // must reference parent for stringOps::expand to work nicely
    dictionary codeDict("#codeStream", parentDict, is);

    streamingFunctionType function = getFunction(parentDict, codeDict);

    // use function to write stream
    OStringStream os(is.format());
    (*function)(os, parentDict);

    // get the entry from this stream
    IStringStream resultStream(os.str());
    entry.read(parentDict, resultStream);


    return true;
}

Foam::reactingParcelInjectionData::reactingParcelInjectionData(Istream& is)
:
    thermoParcelInjectionData(is)
{
    is.check("reading Y's");
    is >> Y_;

    is.check("reactingParcelInjectionData(Istream& is)");
}

Foam::thermoParcelInjectionData::thermoParcelInjectionData(Istream& is)
:
    kinematicParcelInjectionData(is)
{
    is.check("reading T");
    is >> T_;

    is.check("reading cp");
    is >> cp_;

    is.check("thermoParcelInjectionData(Istream& is)");
}

bool Foam::entry::getKeyword(keyType& keyword, Istream& is)
{
    token keywordToken;

    // Read the next valid token discarding spurious ';'s
    do
    {
        if
        (
            is.read(keywordToken).bad()
         || is.eof()
         || !keywordToken.good()
        )
        {
            return false;
        }
    }
    while (keywordToken == token::END_STATEMENT);

    // If the token is a valid keyword set 'keyword' return true...
    if (keywordToken.isWord())
    {
        keyword = keywordToken.wordToken();
        return true;
    }
    else if (keywordToken.isString())
    {
        // Enable wildcards
        keyword = keywordToken.stringToken();
        return true;
    }
    // If it is the end of the dictionary or file return false...
    else if (keywordToken == token::END_BLOCK || is.eof())
    {
        return false;
    }
    // Otherwise the token is invalid
    else
    {
        cerr<< "--> FOAM Warning : " << std::endl
            << "    From function "
            << "entry::getKeyword(keyType&, Istream&)" << std::endl
            << "    in file " << __FILE__
            << " at line " << __LINE__ << std::endl
            << "    Reading " << is.name().c_str() << std::endl
            << "    found " << keywordToken << std::endl
            << "    expected either " << token::END_BLOCK << " or EOF"
            << std::endl;

        return false;
    }
}

void Foam::dimensioned<Type>::initialize(Istream& is)
{
    token nextToken(is);
    is.putBack(nextToken);

    // Check if the original format is used in which the name is provided
    // and reset the name to that read
    if (nextToken.isWord())
    {
        is >> name_;
        is >> nextToken;
        is.putBack(nextToken);
    }

Foam::primitiveEntry::primitiveEntry(const keyType& key, Istream& is)
:
    entry(key),
    ITstream
    (
        is.name() + '.' + key,
        tokenList(10),
        is.format(),
        is.version()
    )
{
    readEntry(dictionary::null, is);
}

void Foam::HashPtrTable<T, Key, Hash>::read(Istream& is, const INew& inewt)
{
    is.fatalCheck("HashPtrTable<T, Key, Hash>::read(Istream&, const INew&)");

    token firstToken(is);

    is.fatalCheck
    (
        "HashPtrTable<T, Key, Hash>::read(Istream&, const INew&) : "
        "reading first token"
    );

    if (firstToken.isLabel())
    {
        label s = firstToken.labelToken();

        // Read beginning of contents
        char delimiter = is.readBeginList("HashPtrTable<T, Key, Hash>");

        if (s)
        {
            if (2*s > this->tableSize_)
            {
                this->resize(2*s);
            }

            if (delimiter == token::BEGIN_LIST)
            {
                for (label i=0; i<s; i++)
                {
                    Key key;
                    is >> key;
                    this->insert(key, inewt(key, is).ptr());

                    is.fatalCheck
                    (
                        "HashPtrTable<T, Key, Hash>::"
                        "read(Istream&, const INew&) : reading entry"
                    );
                }
            }
            else
            {
                FatalIOErrorIn
                (
                    "HashPtrTable<T, Key, Hash>::read(Istream&, const INew&)",
                    is
                )   << "incorrect first token, '(', found " << firstToken.info()
                    << exit(FatalIOError);
            }
        }

Foam::incompressible::incompressible(Istream& is)
:
    specie(is),
    rho_(readScalar(is))
{
    is.check("incompressible::incompressible(Istream& is)");
}

static void load_data_record(Istream& fin, const gcstring& table, int tran, int n)
	{
	try
		{
		if (n > loadbuf_size)
			{
			loadbuf_size = max(n, 2 * loadbuf_size);
			mem_release(loadbuf);
			loadbuf = (char*) mem_committed(loadbuf_size);
			verify(loadbuf);
			}
		fin.read(loadbuf, n);
		Record rec(loadbuf);
		if (rec.cursize() != n)
			except_err(table << ": rec size " << rec.cursize() << " not what was read " << n);
		if (table == "views")
			theDB()->add_any_record(tran, table, rec);
		else
			theDB()->add_record(tran, table, rec);
		}
	catch (const Except& e)
		{
		errlog("load: skipping corrupted record in: ", table.str(), e.str());
		alert("skipping corrupted record in: " << table << ": " << e);
		alerts = true;
		}
	}

unsigned char Foam::SHA1Digest::readHexDigit(Istream& is)
{
    // Takes into account that 'a' (or 'A') is 10
    static const int alphaOffset = toupper('A') - 10;
    // Takes into account that '0' is 0
    static const int zeroOffset = int('0');


    // silently ignore leading or intermediate '_'
    char c = 0;
    do
    {
        is.read(c);
    }
    while (c == '_');

    if (!isxdigit(c))
    {
        FatalIOErrorIn("SHA1Digest::readHexDigit(Istream&)", is)
            << "Illegal hex digit: '" << c << "'"
            << exit(FatalIOError);
    }

    if (isdigit(c))
    {
        return int(c) - zeroOffset;
    }
    else
    {
        return toupper(c) - alphaOffset;
    }
}