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ZipFile : Add support for Zip64 (Compressed file over 4GB) #1271

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ZipFile : Add support for Zip64 (Compressed file over 4GB) #1271

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Add support for zip64 format
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@flyingrub
flyingrub committed Sep 7, 2022
commit b849feb33dbcec795fee91c3d4dd88af2c41cd86
22 changes: 22 additions & 0 deletions modules/juce_core/zip/juce_ZipFile.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,28 @@ struct ZipFile::ZipEntryHolder
entry.isSymbolicLink = (fileType == 0xA);

entry.filename = String::fromUTF8 (buffer + 46, fileNameLen);

auto const extraFieldLength = ByteOrder::littleEndianShort(buffer + 30);
if (extraFieldLength != 0)
{
auto extraFieldOffset = 0;
auto* extraHeaderPtr = buffer + 46 + fileNameLen;
auto* extraSectionPtr = extraHeaderPtr;
while (extraFieldOffset < extraFieldLength) {
auto extraHeaderTag = ByteOrder::littleEndianShort(extraSectionPtr);
auto extraFieldSectionLength = ByteOrder::littleEndianShort(extraSectionPtr + 2);
if (extraHeaderTag == 0x0001) // Zip64 Tag
{
entry.uncompressedSize = (int64)ByteOrder::littleEndianInt64(extraSectionPtr + 4);
if (extraFieldSectionLength > 8)
compressedSize = (int64)ByteOrder::littleEndianInt64(extraHeaderPtr + 12);
if (extraFieldSectionLength > 16)
streamOffset = (int64)ByteOrder::littleEndianInt64(extraHeaderPtr + 20);
}
extraFieldOffset += extraFieldSectionLength + 4;
extraSectionPtr = extraHeaderPtr + extraFieldOffset;
}
}
}

static Time parseFileTime (uint32 time, uint32 date) noexcept
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