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+ GNU GENERAL PUBLIC LICENSE
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+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
--- /dev/null
+// Copyright (C) 2011 Michael McMaster <michael@codesrc.com>
+//
+// This file is part of libzipper.
+//
+// libzipper is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// libzipper is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with libzipper. If not, see <http://www.gnu.org/licenses/>.
+
+#include "zipper.hh"
+
+#include <zlib.h>
+
+#include <algorithm>
+#include <cassert>
+#include <iostream>
+
+using namespace zipper;
+
+namespace
+{
+ uint32_t
+ read32(const std::vector<uint8_t>& zipData, size_t pos)
+ {
+ // Read 4 bytes in little-endian order.
+ // Return results in host-endian.
+ return uint32_t(
+ zipData[pos] |
+ (uint32_t(zipData[pos+1]) << 8) |
+ (uint32_t(zipData[pos+2]) << 16) |
+ (uint32_t(zipData[pos+3]) << 24)
+ );
+ }
+
+ uint16_t
+ read16(const std::vector<uint8_t>& zipData, size_t pos)
+ {
+ // Read 2 bytes in little-endian order.
+ // Return results in host-endian.
+ return uint16_t(
+ zipData[pos] |
+ (uint16_t(zipData[pos+1]) << 8)
+ );
+ }
+
+ struct InflateDeleter
+ {
+ public:
+ InflateDeleter(z_stream* stream) : m_stream(stream) {}
+ ~InflateDeleter()
+ {
+ inflateEnd(m_stream);
+
+ }
+ private:
+ z_stream* m_stream;
+ };
+
+ class FileEntry : public CompressedFile
+ {
+ public:
+ FileEntry(
+ ProviderPtr provider,
+ uint16_t versionNeeded,
+ uint16_t gpFlag,
+ uint16_t compressionMethod,
+ uint16_t lastModTime,
+ uint16_t lastModDate,
+ uint32_t crc32,
+ uint32_t compressedSize,
+ uint32_t uncompressedSize,
+ uint32_t localHeaderOffset,
+ std::string fileName,
+ std::string extra,
+ std::string comment
+ ) :
+ m_provider(provider),
+ m_versionNeeded(versionNeeded),
+ m_gpFlag(gpFlag),
+ m_compressionMethod(compressionMethod),
+ m_lastModTime(lastModTime),
+ m_lastModDate(lastModDate),
+ m_crc32(crc32),
+ m_compressedSize(compressedSize),
+ m_uncompressedSize(uncompressedSize),
+ m_localHeaderOffset(localHeaderOffset),
+ m_fileName(fileName),
+ m_extra(extra),
+ m_comment(comment)
+ {
+ }
+
+ virtual bool isValid() const
+ {
+ return ((m_versionNeeded & 0xf) <= 20) &&
+ ((m_gpFlag & 0x1) == 0) && // Not encrypted
+ (m_compressionMethod <= 8);
+ }
+
+ virtual void uncompress(Consumer& consumer)
+ {
+ enum
+ {
+ Signature = 0x04034b50,
+ MinRecordBytes = 30,
+ ChunkSize = 64*1024,
+ WindowBits = 15
+ };
+
+ std::vector<uint8_t> localRecord(MinRecordBytes);
+ m_provider->zip_readData(
+ m_localHeaderOffset, MinRecordBytes, &localRecord[0]
+ );
+ if (read32(localRecord, 0) != Signature)
+ {
+ throw ZipFormatException("Invalid local ZIP record");
+ }
+
+ // Don't trust the lengths for filename and extra content read from
+ // the central records. At least for extra, these DO differ for
+ // unknown reasons
+ size_t filenameLength(read16(localRecord, 26));
+ size_t extraLength(read16(localRecord, 28));
+
+ zoff64_t startCompressedBytes(
+ m_localHeaderOffset +
+ MinRecordBytes +
+ filenameLength +
+ extraLength
+ );
+
+ zoff64_t endCompressedBytes(
+ startCompressedBytes + m_compressedSize
+ );
+
+ if (endCompressedBytes > m_provider->zip_getSize())
+ {
+ throw ZipFormatException("Compressed file size is too long");
+ }
+
+ switch (m_compressionMethod)
+ {
+ case 0: // No compression
+ {
+ for (zoff64_t pos(startCompressedBytes);
+ pos < endCompressedBytes;
+ pos += ChunkSize
+ )
+ {
+ uint8_t buf[ChunkSize];
+ size_t bytes(
+ std::min(zoff64_t(ChunkSize), endCompressedBytes - pos)
+ );
+ m_provider->zip_readData(pos, bytes, &buf[0]);
+ consumer.zip_writeData(bytes, &buf[0]);
+ }
+ }; break;
+
+ case 8: // Deflate
+ {
+ uint8_t inChunk[ChunkSize];
+ uint8_t outChunk[ChunkSize];
+
+ z_stream stream;
+ stream.zalloc = NULL;
+ stream.zfree = NULL;
+ stream.opaque = NULL;
+ int zlibErr(inflateInit2(&stream, -WindowBits));
+ assert(zlibErr == Z_OK);
+ InflateDeleter deleter(&stream);
+ stream.next_in = NULL;
+ stream.avail_in = 0;
+
+ for (zoff64_t pos(startCompressedBytes);
+ pos < endCompressedBytes;
+ pos += ChunkSize
+ )
+ {
+ if (stream.avail_in == 0)
+ {
+ stream.avail_in =
+ std::min(
+ zoff64_t(ChunkSize),
+ endCompressedBytes - pos
+ );
+ m_provider->zip_readData(
+ pos, stream.avail_in, &inChunk[0]
+ );
+ stream.next_in = reinterpret_cast<Bytef*>(&inChunk);
+ }
+
+ stream.next_out = reinterpret_cast<Bytef*>(&outChunk);
+ stream.avail_out = sizeof(outChunk);
+
+ zlibErr = inflate(&stream, Z_SYNC_FLUSH);
+
+ bool finished(false);
+ if (zlibErr == Z_STREAM_END)
+ {
+ finished = true;
+ }
+ else if (zlibErr != Z_OK)
+ {
+ throw ZipFormatException("Corrupt Data");
+ }
+
+ consumer.zip_writeData(
+ sizeof(outChunk) - stream.avail_out,
+ &outChunk[0]
+ );
+
+ if (finished) break;
+ }
+ }; break;
+
+ default:
+ throw ZipUnsupportedException("Unsupported compression scheme");
+ };
+ }
+
+ private:
+ ProviderPtr m_provider;
+ uint16_t m_versionNeeded;
+ uint16_t m_gpFlag;
+ uint16_t m_compressionMethod;
+ uint16_t m_lastModTime;
+ uint16_t m_lastModDate;
+ uint32_t m_crc32;
+ uint32_t m_compressedSize;
+ uint32_t m_uncompressedSize;
+ uint32_t m_localHeaderOffset;
+ std::string m_fileName;
+ std::string m_extra;
+ std::string m_comment;
+ };
+}
+
+class Unzip::UnzipImpl
+{
+public:
+ UnzipImpl(const ProviderPtr& provider) :
+ m_provider(provider)
+ {
+ readCentralDirectory();
+ }
+
+ std::vector<CompressedFilePtr>
+ getEntries() const
+ {
+ return m_entries;
+ }
+
+private:
+ ProviderPtr m_provider;
+ std::vector<CompressedFilePtr> m_entries;
+
+ struct EndCentralDirectory
+ {
+ size_t centralDirectoryBytes;
+ size_t centralDirectoryOffset;
+ size_t centralDirectoryEntries;
+ std::string zipFileComment;
+ };
+ EndCentralDirectory m_endCentralDirectory;
+
+ void readCentralDirectory()
+ {
+ enum
+ {
+ MinRecordBytes = 46,
+ Signature = 0x02014b50
+ };
+
+ readEndCentralDirectory();
+
+ std::vector<uint8_t> buffer(
+ m_endCentralDirectory.centralDirectoryBytes
+ );
+ m_provider->zip_readData(
+ m_endCentralDirectory.centralDirectoryOffset,
+ m_endCentralDirectory.centralDirectoryBytes,
+ &buffer[0]
+ );
+
+ size_t pos(0);
+ while ((pos + MinRecordBytes) < buffer.size())
+ {
+ if (read32(buffer, pos) != Signature)
+ {
+ // Unknown record type.
+ pos += 1;
+ continue;
+ }
+
+ uint16_t versionNeeded(read16(buffer, pos + 6));
+ uint16_t gpFlag(read16(buffer, pos + 8));
+ uint16_t compressionMethod(read16(buffer, pos + 10));
+ uint16_t lastModTime(read16(buffer, pos + 12));
+ uint16_t lastModDate(read16(buffer, pos + 14));
+ uint32_t crc32(read32(buffer, pos + 16));
+ uint32_t compressedSize(read32(buffer, pos + 20));
+ uint32_t uncompressedSize(read32(buffer, pos + 24));
+ size_t fileNameLen(read16(buffer, pos + 28));
+ size_t extraLen(read16(buffer, pos + 30));
+ size_t commentLen(read16(buffer, pos + 32));
+ uint32_t localHeaderOffset(read32(buffer, pos + 42));
+
+ if ((fileNameLen + extraLen + commentLen + MinRecordBytes + pos) >
+ buffer.size()
+ )
+ {
+ throw ZipFormatException("File comments are too long");
+ }
+
+ std::string fileName(
+ &buffer[pos + MinRecordBytes],
+ &buffer[pos + MinRecordBytes + fileNameLen]
+ );
+
+ std::string extra(
+ &buffer[pos+MinRecordBytes+fileNameLen],
+ &buffer[pos+MinRecordBytes+fileNameLen+extraLen]
+ );
+
+ std::string comment(
+ &buffer[pos+MinRecordBytes+fileNameLen+extraLen],
+ &buffer[pos+MinRecordBytes+fileNameLen+extraLen+commentLen]
+ );
+
+ m_entries.push_back(
+ CompressedFilePtr(
+ new FileEntry(
+ m_provider,
+ versionNeeded,
+ gpFlag,
+ compressionMethod,
+ lastModTime,
+ lastModDate,
+ crc32,
+ compressedSize,
+ uncompressedSize,
+ localHeaderOffset,
+ fileName,
+ extra,
+ comment
+ )
+ )
+ );
+
+ pos += MinRecordBytes + fileNameLen + extraLen + commentLen;
+ }
+ }
+
+ void readEndCentralDirectory()
+ {
+ // Read the end of central directory record. This
+ // record enables us to find the remainding
+ // records without searching for record signatures.
+
+ // TODO does not consider the Zip64 entries.
+
+ enum
+ {
+ MinRecordBytes = 22, // Minimum size with no comment
+ MaxCommentBytes = 65535, // 2 bytes to store comment length
+ Signature = 0x06054b50
+ };
+
+ zoff64_t providerSize(m_provider->zip_getSize());
+ if (providerSize < MinRecordBytes)
+ {
+ throw ZipFormatException("Too small");
+ }
+
+ size_t bufSize(
+ std::min(zoff64_t(MinRecordBytes + MaxCommentBytes), providerSize)
+ );
+ std::vector<uint8_t> buffer(bufSize);
+ m_provider->zip_readData(providerSize - bufSize, bufSize, &buffer[0]);
+
+ // Need to search for this record, as it ends in a variable-length
+ // comment field. Search backwards, with the assumption that the
+ // comment doesn't exist, or is much smaller than the maximum
+ // length
+
+ bool recordFound(false);
+ ssize_t pos(bufSize - MinRecordBytes);
+ for (; pos >= 0; --pos)
+ {
+ recordFound = (read32(buffer, pos) == Signature);
+ break;
+ }
+
+ if (!recordFound)
+ {
+ throw ZipFormatException("ZIP directory records not found");
+ }
+
+ if (read16(buffer, pos + 4) != 0)
+ {
+ throw ZipUnsupportedException("Spanned disks not supported");
+ }
+
+ m_endCentralDirectory.centralDirectoryBytes = read32(buffer, pos + 12);
+ m_endCentralDirectory.centralDirectoryOffset =
+ read32(buffer, pos + 16);
+ m_endCentralDirectory.centralDirectoryEntries =
+ read16(buffer, pos + 10);
+
+ size_t commentLength(read16(buffer, pos + 20));
+ size_t commentStart(pos + MinRecordBytes);
+ if (commentStart + commentLength > bufSize)
+ {
+ throw ZipFormatException("ZIP comment is too long");
+ }
+ m_endCentralDirectory.zipFileComment =
+ std::string(
+ &buffer[commentStart],
+ &buffer[commentStart + commentLength]
+ );
+ }
+
+};
+
+Unzip::Unzip(const ProviderPtr& provider) :
+ m_unzipper(new UnzipImpl(provider))
+{
+}
+
+Unzip::~Unzip()
+{
+ delete m_unzipper;
+}
+
+std::vector<CompressedFilePtr>
+Unzip::getEntries() const
+{
+ return m_unzipper->getEntries();
+}
+
projects / libzipper.git / commitdiff