C++ SeekableReadStream::pos方法代码示例

void printDataHex(SeekableReadStream &stream, size_t size) {
	size_t pos = stream.pos();

	size = MIN<size_t>(stream.size() - pos, size);

	if (size == 0)
		return;

	uint32 offset = 0;
	byte rowData[16];

	while (size > 0) {
		// At max 16 bytes printed per row
		uint32 n = MIN<size_t>(size, 16);
		if (stream.read(rowData, n) != n)
			throw Exception(kReadError);

		// Print an offset
		std::fprintf(stderr, "%08X  ", offset);

		// 2 "blobs" of each 8 bytes per row
		for (uint32 i = 0; i < 2; i++) {
			for (uint32 j = 0; j < 8; j++) {
				uint32 m = i * 8 + j;

				if (m < n)
					// Print the data
					std::fprintf(stderr, "%02X ", rowData[m]);
				else
					// Last row, data count not aligned to 16
					std::fprintf(stderr, "   ");
			}

			// Separate the blobs by an extra space
			std::fprintf(stderr, " ");
		}

		std::fprintf(stderr, "|");

		// If the data byte is a printable character, print it. If not, substitute a '.'
		for (uint32 i = 0; i < n; i++)
			std::fprintf(stderr, "%c", std::isprint(rowData[i]) ? rowData[i] : '.');

		std::fprintf(stderr, "|\n");

		size   -= n;
		offset += n;
	}

	// Seek back
	stream.seek(pos);
}

void StreamTokenizer::nextChunk(SeekableReadStream &stream) {
	skipChunk(stream);

	byte c = stream.readByte();

	if (stream.eos() || stream.err())
		return;

	if (!isIn(c, _chunkEnds))
		stream.seek(-1, SEEK_CUR);
	else
		if (stream.pos() == stream.size())
			// This actually the last character, read one more byte to properly set the EOS state
			stream.readByte();
}

String NEResources::getResourceString(SeekableReadStream &exe, uint32 offset) {
    uint32 curPos = exe.pos();

    if (!exe.seek(offset)) {
        exe.seek(curPos);
        return "";
    }

    uint8 length = exe.readByte();

    String string;
    for (uint16 i = 0; i < length; i++)
        string += (char)exe.readByte();

    exe.seek(curPos);
    return string;
}