PackageDataInlineReader: Do not use fData before it has been set.

Spotted by Clang.

Switch package kit to BZlibCompressionAlgorithm

... and remove the Zlib{Compressor,Decompressor} API.

Move package kit Zlib* classes to support kit

Also move to B* namespace and no longer expose the zlib dependency in
the headers.

Remove BPackageKit::BDataOutput

Use BDataIO instead.

Revert "Move ZlibDecompressor to libshared"

This reverts commit 9af2105d36856be60528c361edf14a263f242338.

Conflicts:
src/kits/package/Jamfile

Revert "Fix more issues detected by gcc4 compiler:"

This reverts commit 19f3bae0716c4eb7dd2a5716778560580be68071.

Revert "Style fixes, no functional changes"

This reverts commit 916382a10f471ca31087dd71b8d3ece5de9cd421.

Fix gcc 4.9.0 build

Signed-off-by: Jérôme Duval <jerome.duval@gmail.com>

Style fixes, no functional changes

* Pointed out by Axel and Ingo.

Fix more issues detected by gcc4 compiler:

More ssize_t/status_t mixup.

Move ZlibDecompressor to libshared

* This will be used to implement compressed http streams
* Remove the custom BDataOutput class, and use BDataIO instead, for
easier integration with existing code.

hpkg format: compress the whole heap

Instead of handling compression for individual file/attribute data we
do now compress the whole heap where they are stored. This
significantly improves compression ratios. We still divide the
uncompressed data into 64 KiB chunks and use a chunk offset array for
the compressed chunks to allow for quick random access without too much
overhead. The tradeoff is a limited possible compression ratio -- i.e.
we won't be as good as tar.gz (though surprisingly with my test
archives we did better than zip).

The other package file sections (package attributes and TOC) are no
longer compressed individually. Their uncompressed data are simply
pushed onto the heap where the usual compression strategy applies. To
simplify things the repository format has been changed in the same
manner although it doesn't otherwise use the heap, since it only stores
meta data.

Due to the data compression having been exposed in public and private
API, this change touches a lot of package kit using code, including
packagefs and the boot loader packagefs support. The latter two haven't
been tested yet. Moreover packagefs needs a new kind of cache so we
avoid re-reading the same heap chunk for two different data items it
contains.

Rename BBlockBufferCache and friends to *Pool*

Also move BBlockBufferPoolNoLock into BHPKG namespace with the other
classes. Not sure why it wasn't there before.

package kit: internalize BPackageDataReader

It is no longer public (or even private) API. BPackageDataReaderFactory
returns a BAbstractBufferedDataReader instead. The advantage is that
the latter doesn't have hpkg format specific dependencies.

BPackageDataReader: Remove unused Size(), BlockSize()

Clone read support functionality for HPKG format version 1

It uses sub-namespace BPackage::BHPKG::V1. Unlike the one for the
current format version, the V1 version of BPackageInfoContentHandler
lives in BHPKG(::V1) sub-namespace and is private.

Switch package kit to BZlibCompressionAlgorithm

... and remove the Zlib{Compressor,Decompressor} API.

Move package kit Zlib* classes to support kit

Also move to B* namespace and no longer expose the zlib dependency in
the headers.

Remove BPackageKit::BDataOutput

Use BDataIO instead.

Revert "Move ZlibDecompressor to libshared"

This reverts commit 9af2105d36856be60528c361edf14a263f242338.

Conflicts:
src/kits/package/Jamfile

Revert "Fix more issues detected by gcc4 compiler:"

This reverts commit 19f3bae0716c4eb7dd2a5716778560580be68071.

Revert "Style fixes, no functional changes"

This reverts commit 916382a10f471ca31087dd71b8d3ece5de9cd421.

Fix gcc 4.9.0 build

Signed-off-by: Jérôme Duval <jerome.duval@gmail.com>

Style fixes, no functional changes

* Pointed out by Axel and Ingo.

Fix more issues detected by gcc4 compiler:

More ssize_t/status_t mixup.

Move ZlibDecompressor to libshared

* This will be used to implement compressed http streams
* Remove the custom BDataOutput class, and use BDataIO instead, for
easier integration with existing code.

hpkg format: compress the whole heap

Instead of handling compression for individual file/attribute data we
do now compress the whole heap where they are stored. This
significantly improves compression ratios. We still divide the
uncompressed data into 64 KiB chunks and use a chunk offset array for
the compressed chunks to allow for quick random access without too much
overhead. The tradeoff is a limited possible compression ratio -- i.e.
we won't be as good as tar.gz (though surprisingly with my test
archives we did better than zip).

The other package file sections (package attributes and TOC) are no
longer compressed individually. Their uncompressed data are simply
pushed onto the heap where the usual compression strategy applies. To
simplify things the repository format has been changed in the same
manner although it doesn't otherwise use the heap, since it only stores
meta data.

Due to the data compression having been exposed in public and private
API, this change touches a lot of package kit using code, including
packagefs and the boot loader packagefs support. The latter two haven't
been tested yet. Moreover packagefs needs a new kind of cache so we
avoid re-reading the same heap chunk for two different data items it
contains.

Rename BBlockBufferCache and friends to *Pool*

Also move BBlockBufferPoolNoLock into BHPKG namespace with the other
classes. Not sure why it wasn't there before.

package kit: internalize BPackageDataReader

It is no longer public (or even private) API. BPackageDataReaderFactory
returns a BAbstractBufferedDataReader instead. The advantage is that
the latter doesn't have hpkg format specific dependencies.

BPackageDataReader: Remove unused Size(), BlockSize()

Clone read support functionality for HPKG format version 1

It uses sub-namespace BPackage::BHPKG::V1. Unlike the one for the
current format version, the V1 version of BPackageInfoContentHandler
lives in BHPKG(::V1) sub-namespace and is private.