Java BufferIterator类代码示例

import libcore.io.BufferIterator; //导入依赖的package包/类
public static ZoneInfo makeTimeZone(String id, BufferIterator it) {
    // Variable names beginning tzh_ correspond to those in "tzfile.h".
    // Check tzh_magic.
    if (it.readInt() != 0x545a6966) { // "TZif"
        return null;
    }
    // Skip the uninteresting part of the header.
    it.skip(28);
    // Read the sizes of the arrays we're about to read.
    int tzh_timecnt = it.readInt();
    int tzh_typecnt = it.readInt();
    it.skip(4); // Skip tzh_charcnt.
    int[] transitions = new int[tzh_timecnt];
    it.readIntArray(transitions, 0, transitions.length);
    byte[] type = new byte[tzh_timecnt];
    it.readByteArray(type, 0, type.length);
    int[] gmtOffsets = new int[tzh_typecnt];
    byte[] isDsts = new byte[tzh_typecnt];
    for (int i = 0; i < tzh_typecnt; ++i) {
        gmtOffsets[i] = it.readInt();
        isDsts[i] = it.readByte();
        // We skip the abbreviation index. This would let us provide historically-accurate
        // time zone abbreviations (such as "AHST", "YST", and "AKST" for standard time in
        // America/Anchorage in 1982, 1983, and 1984 respectively). ICU only knows the current
        // names, though, so even if we did use this data to provide the correct abbreviations
        // for en_US, we wouldn't be able to provide correct abbreviations for other locales,
        // nor would we be able to provide correct long forms (such as "Yukon Standard Time")
        // for any locale. (The RI doesn't do any better than us here either.)
        it.skip(1);
    }
    return new ZoneInfo(id, transitions, type, gmtOffsets, isDsts);
}
 

import libcore.io.BufferIterator; //导入依赖的package包/类
ZipEntry(byte[] cdeHdrBuf, InputStream cdStream) throws IOException {
    Streams.readFully(cdStream, cdeHdrBuf, 0, cdeHdrBuf.length);

    BufferIterator it = HeapBufferIterator.iterator(cdeHdrBuf, 0, cdeHdrBuf.length,
            ByteOrder.LITTLE_ENDIAN);

    int sig = it.readInt();
    if (sig != CENSIG) {
        ZipFile.throwZipException("Central Directory Entry", sig);
    }

    it.seek(8);
    int gpbf = it.readShort() & 0xffff;

    if ((gpbf & ZipFile.GPBF_UNSUPPORTED_MASK) != 0) {
        throw new ZipException("Invalid General Purpose Bit Flag: " + gpbf);
    }

    compressionMethod = it.readShort() & 0xffff;
    time = it.readShort() & 0xffff;
    modDate = it.readShort() & 0xffff;

    // These are 32-bit values in the file, but 64-bit fields in this object.
    crc = ((long) it.readInt()) & 0xffffffffL;
    compressedSize = ((long) it.readInt()) & 0xffffffffL;
    size = ((long) it.readInt()) & 0xffffffffL;

    nameLength = it.readShort() & 0xffff;
    int extraLength = it.readShort() & 0xffff;
    int commentByteCount = it.readShort() & 0xffff;

    // This is a 32-bit value in the file, but a 64-bit field in this object.
    it.seek(42);
    localHeaderRelOffset = ((long) it.readInt()) & 0xffffffffL;

    byte[] nameBytes = new byte[nameLength];
    Streams.readFully(cdStream, nameBytes, 0, nameBytes.length);
    if (containsNulByte(nameBytes)) {
        throw new ZipException("Filename contains NUL byte: " + Arrays.toString(nameBytes));
    }
    name = new String(nameBytes, 0, nameBytes.length, StandardCharsets.UTF_8);

    if (extraLength > 0) {
        extra = new byte[extraLength];
        Streams.readFully(cdStream, extra, 0, extraLength);
    }

    // The RI has always assumed UTF-8. (If GPBF_UTF8_FLAG isn't set, the encoding is
    // actually IBM-437.)
    if (commentByteCount > 0) {
        byte[] commentBytes = new byte[commentByteCount];
        Streams.readFully(cdStream, commentBytes, 0, commentByteCount);
        comment = new String(commentBytes, 0, commentBytes.length, StandardCharsets.UTF_8);
    }
}
 

import libcore.io.BufferIterator; //导入依赖的package包/类
ZipEntry(byte[] hdrBuf, InputStream in) throws IOException {
    Streams.readFully(in, hdrBuf, 0, hdrBuf.length);

    BufferIterator it = HeapBufferIterator.iterator(hdrBuf, 0, hdrBuf.length, ByteOrder.LITTLE_ENDIAN);

    int sig = it.readInt();
    if (sig != CENSIG) {
         throw new ZipException("Central Directory Entry not found");
    }

    it.seek(8);
    int gpbf = it.readShort() & 0xffff;

    if ((gpbf & ZipFile.GPBF_UNSUPPORTED_MASK) != 0) {
        throw new ZipException("Invalid General Purpose Bit Flag: " + gpbf);
    }

    compressionMethod = it.readShort() & 0xffff;
    time = it.readShort() & 0xffff;
    modDate = it.readShort() & 0xffff;

    // These are 32-bit values in the file, but 64-bit fields in this object.
    crc = ((long) it.readInt()) & 0xffffffffL;
    compressedSize = ((long) it.readInt()) & 0xffffffffL;
    size = ((long) it.readInt()) & 0xffffffffL;

    nameLength = it.readShort() & 0xffff;
    int extraLength = it.readShort() & 0xffff;
    int commentByteCount = it.readShort() & 0xffff;

    // This is a 32-bit value in the file, but a 64-bit field in this object.
    it.seek(42);
    localHeaderRelOffset = ((long) it.readInt()) & 0xffffffffL;

    byte[] nameBytes = new byte[nameLength];
    Streams.readFully(in, nameBytes, 0, nameBytes.length);
    if (containsNulByte(nameBytes)) {
       throw new ZipException("Filename contains NUL byte: " + Arrays.toString(nameBytes));
    }
    name = new String(nameBytes, 0, nameBytes.length, StandardCharsets.UTF_8);

    if (extraLength > 0) {
        extra = new byte[extraLength];
        Streams.readFully(in, extra, 0, extraLength);
    }

    // The RI has always assumed UTF-8. (If GPBF_UTF8_FLAG isn't set, the encoding is
    // actually IBM-437.)
    if (commentByteCount > 0) {
        byte[] commentBytes = new byte[commentByteCount];
        Streams.readFully(in, commentBytes, 0, commentByteCount);
        comment = new String(commentBytes, 0, commentBytes.length, StandardCharsets.UTF_8);
    }
}