From 0d63f9a814f14717a5d9e0f51d79714fc0438417 Mon Sep 17 00:00:00 2001 From: PJ Fanning Date: Mon, 25 Nov 2024 19:33:17 +0000 Subject: [PATCH] [github-731] Fix the mini-stream size in the root property. This closes #731 git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1922094 13f79535-47bb-0310-9956-ffa450edef68 --- .../poi/poifs/filesystem/POIFSMiniStore.java | 29 ++++++--- .../poifs/filesystem/TestPOIFSMiniStore.java | 65 +++++++++++++++++++ 2 files changed, 86 insertions(+), 8 deletions(-) diff --git a/poi/src/main/java/org/apache/poi/poifs/filesystem/POIFSMiniStore.java b/poi/src/main/java/org/apache/poi/poifs/filesystem/POIFSMiniStore.java index 18cdfd58f7..cb1929d0d6 100644 --- a/poi/src/main/java/org/apache/poi/poifs/filesystem/POIFSMiniStore.java +++ b/poi/src/main/java/org/apache/poi/poifs/filesystem/POIFSMiniStore.java @@ -247,20 +247,33 @@ public class POIFSMiniStore extends BlockStore { * based on full blocks used, not the data within the streams */ void syncWithDataSource() throws IOException { - int blocksUsed = 0; for (BATBlock sbat : _sbat_blocks) { ByteBuffer block = _filesystem.getBlockAt(sbat.getOurBlockIndex()); sbat.writeData(block); - - if (!sbat.hasFreeSectors()) { - blocksUsed += _filesystem.getBigBlockSizeDetails().getBATEntriesPerBlock(); - } else { - blocksUsed += sbat.getOccupiedSize(); - } } + // Set the size on the root in terms of the number of SBAT blocks // RootProperty.setSize does the sbat -> bytes conversion for us - _filesystem._get_property_table().getRoot().setSize(blocksUsed); + _filesystem._get_property_table().getRoot().setSize(computeSize()); + } + + /** + * Computes the size of the mini-stream (in number of mini blocks). The trailing + * unallocated mini blocks are ignored, the others are counted as allocated. This + * behaviour was checked with MSI files signed with signtool. + */ + private int computeSize() { + int entriesPerBlock = _filesystem.getBigBlockSizeDetails().getBATEntriesPerBlock(); + for (int sbatIndex = _sbat_blocks.size() - 1; sbatIndex >= 0; sbatIndex--) { + BATBlock sbat = _sbat_blocks.get(sbatIndex); + for (int miniBlockIndex = entriesPerBlock - 1; miniBlockIndex >= 0; miniBlockIndex--) { + if (sbat.getValueAt(miniBlockIndex) != POIFSConstants.UNUSED_BLOCK) { + return (sbatIndex * entriesPerBlock) + miniBlockIndex + 1; + } + } + } + + return 0; } @Override diff --git a/poi/src/test/java/org/apache/poi/poifs/filesystem/TestPOIFSMiniStore.java b/poi/src/test/java/org/apache/poi/poifs/filesystem/TestPOIFSMiniStore.java index 8d24e9f87b..6b85326a90 100644 --- a/poi/src/test/java/org/apache/poi/poifs/filesystem/TestPOIFSMiniStore.java +++ b/poi/src/test/java/org/apache/poi/poifs/filesystem/TestPOIFSMiniStore.java @@ -28,7 +28,9 @@ import java.nio.ByteBuffer; import java.util.Iterator; import java.util.NoSuchElementException; +import org.apache.commons.io.output.NullOutputStream; import org.apache.poi.POIDataSamples; +import org.apache.poi.hpsf.ClassID; import org.apache.poi.poifs.common.POIFSConstants; import org.apache.poi.util.IOUtils; import org.junit.jupiter.api.Test; @@ -470,4 +472,67 @@ final class TestPOIFSMiniStore { assertArrayEquals(data2B, r2); fs.close(); } + + /** + * Check the computation of the mini stream size when the mini FAT sectors contain unallocated mini sectors. + * https://github.com/apache/poi/pull/182 + */ + @Test + void testComputeSize() throws Exception { + try (POIFSFileSystem fs = new POIFSFileSystem()) { + fs.getPropertyTable().getRoot().setStorageClsid(new ClassID("000C108400000000C000000000000046")); // MSI storage class + + // create 8 mini FAT sectors fully allocated + for (int i = 0; i < 8 * 128; i++) { + fs.getRoot().createDocument("Entry " + i, new ByteArrayInputStream(new byte[64])); + } + + // Mini FAT Sector #1: Unallocate all the mini sectors + for (int i = 0; i < 128; i++) { + fs.getRoot().getEntry("Entry " + i).delete(); + } + + // Mini FAT Sector #2: Unallocate 8 mini sectors at the beginning + for (int i = 128; i < 128 + 8; i++) { + fs.getRoot().getEntry("Entry " + i).delete(); + } + + // Mini FAT Sector #3: Unallocate 4 mini sectors in the middle + for (int i = 2 * 128 + 64; i < 2 * 128 + 64 + 4; i++) { + fs.getRoot().getEntry("Entry " + i).delete(); + } + + // Mini FAT Sector #4: Unallocate all the mini sectors + for (int i = 3 * 128; i < 4 * 128; i++) { + fs.getRoot().getEntry("Entry " + i).delete(); + } + + // Mini FAT Sector #5: Unallocate 32 mini sectors at the end + for (int i = 5 * 128 - 32; i < 5 * 128; i++) { + fs.getRoot().getEntry("Entry " + i).delete(); + } + + // Mini FAT Sector #6: Unallocate 64 mini sectors at the beginning and 16 mini sectors at the end + for (int i = 5 * 128; i < 5 * 128 + 64; i++) { + fs.getRoot().getEntry("Entry " + i).delete(); + } + for (int i = 6 * 128 - 16; i < 6 * 128; i++) { + fs.getRoot().getEntry("Entry " + i).delete(); + } + + // Mini FAT Sector #7: Unallocate all the mini sectors + for (int i = 6 * 128; i < 7 * 128; i++) { + fs.getRoot().getEntry("Entry " + i).delete(); + } + + // Mini FAT Sector #8: Unallocate all the mini sectors + for (int i = 7 * 128; i < 8 * 128; i++) { + fs.getRoot().getEntry("Entry " + i).delete(); + } + + fs.writeFilesystem(NullOutputStream.INSTANCE); + + assertEquals(48128, fs.getPropertyTable().getRoot().getSize(), "mini stream size"); + } + } }