Example usage for org.apache.commons.compress.archivers.zip UnrecognizedExtraField UnrecognizedExtraField

Introduction

In this page you can find the example usage for org.apache.commons.compress.archivers.zip UnrecognizedExtraField UnrecognizedExtraField.

Prototype

UnrecognizedExtraField

Source Link

Usage

From source file:cz.muni.fi.xklinec.zipstream.Mallory.java

/**
 * Adds given number of bytes as a null padding to extra field.
 * Minimal padding is 8B. Maximal padding is PAD_BLOCK_MAX.
 * //  w  w w .j ava 2  s  .  c  o m
 * @param ze
 * @param padlen 
 */
public void addExtraPadding(ZipArchiveEntry ze, int padlen) {
    if (padlen < EXTRA_FIELD_SIZE) {
        throw new IllegalArgumentException(
                "Cannot add padding less than 8 B (due to compulsory extra field structure). Given size "
                        + padlen);
    }

    if (padlen > PAD_BLOCK_MAX) {
        throw new IllegalArgumentException(
                "Specified padding is too big, maximal size is " + PAD_BLOCK_MAX + " given size is " + padlen);
    }

    byte[] paddBuff = new byte[padlen - EXTRA_FIELD_SIZE];
    UnrecognizedExtraField zextra = new UnrecognizedExtraField();
    zextra.setHeaderId(new ZipShort(PAD_SIGNATURE));
    zextra.setLocalFileDataData(new byte[0]);
    zextra.setCentralDirectoryData(paddBuff);

    ze.addExtraField(zextra);
}

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