> Add an API note to `InflaterInputStream::read(byte[] b, int off, int len)` to > highlight that it might write more bytes than the returned number of > inflated bytes into the buffer `b`. > > The superclass `java.io.InputStream` specifies that `read(byte[] b, int off, > int len)` will leave the content beyond the last read byte in the read buffer > `b` unaffected. However, the overridden `read` method in > `InflaterInputStream` passes the read buffer `b` to `Inflater::inflate(byte[] > b, int off, int len)` which doesn't provide this guarantee. Depending on > implementation details, `Inflater::inflate` might write more than the > returned number of inflated bytes into the buffer `b`. > > ### TL;DR > > `java.util.zip.Inflater` is the Java wrapper class for zlib's inflater > functionality. `Inflater::inflate(byte[] output, int off, int len)` currently > calls zlib's native `inflate(..)` function and passes the address of > `output[off]` and `len` to it via JNI. > > The specification of zlib's `inflate(..)` function (i.e. the [API > documentation in the original zlib > implementation](https://github.com/madler/zlib/blob/cacf7f1d4e3d44d871b605da3b647f07d718623f/zlib.h#L400)) > doesn't give any guarantees with regard to usage of the output buffer. It > only states that upon completion the function will return the number of bytes > that have been written (i.e. "inflated") into the output buffer. > > The original zlib implementation only wrote as many bytes into the output > buffer as it inflated. However, this is not a hard requirement and newer, > more performant implementations of the zlib library like > [zlib-chromium](https://chromium.googlesource.com/chromium/src/third_party/zlib/) > or [zlib-cloudflare](https://github.com/cloudflare/zlib) can use more bytes > of the output buffer than they actually inflate as a scratch buffer. See > https://github.com/simonis/zlib-chromium for a more detailed description of > their approach and its performance benefit. > > These new zlib versions can still be used transparently from Java (e.g. by > putting them into the `LD_LIBRARY_PATH` or by using `LD_PRELOAD`), because > they still fully comply to specification of `Inflater::inflate(..)`. However, > we might run into problems when using the `Inflater` functionality from the > `InflaterInputStream` class. `InflaterInputStream` is derived from from > `InputStream` and as such, its `read(byte[] b, int off, int len)` method is > quite constrained. It specifically specifies that if *k* bytes have been > read, then "these bytes will be stored in elements `b[off]` through > `b[off+`*k*`-1]`, leaving elements `b[off+`*k*`]` through `b[off+len-1]` > **unaffected**". But `InflaterInputStream::read(byte[] b, int off, int len)` > (which is constrained by `InputStream::read(..)`'s specification) calls > `Inflater::inflate(byte[] b, int off, int len)` and directly passes its > output buffer down to the native zlib `inflate(..)` method which is free to > change the bytes beyond `b[off+`* k*`]` (where *k* is the number of inflated bytes). > > From a practical point of view, I don't see this as a big problem, because > callers of `InflaterInputStream::read(byte[] b, int off, int len)` can never > know how many bytes will be written into the output buffer `b` (and in fact > its content can always be completely overwritten). It therefore makes no > sense to depend on any data there being untouched after the call. Also, > having used zlib-cloudflare productively for about two years, we haven't seen > real-world issues because of this behavior yet. However, from a specification > point of view it is easy to artificially construct a program which violates > `InflaterInputStream::read(..)`'s postcondition if using one of the > alterantive zlib implementations. A recently integrated JTreg test > (test/jdk/jdk/nio/zipfs/ZipFSOutputStreamTest.java) "unintentionally" fails > with zlib-chromium but can fixed easily to run with alternative > implementations as well (see > [JDK-8283756](https://bugs.openjdk.java.net/browse/JDK-8283756)).
Volker Simonis has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision: 8282648: Problems due to conflicting specification of Inflater::inflate(..) and InflaterInputStream::read(..) ------------- Changes: - all: https://git.openjdk.java.net/jdk/pull/7986/files - new: https://git.openjdk.java.net/jdk/pull/7986/files/128166ff..b55fc332 Webrevs: - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7986&range=01 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7986&range=00-01 Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod Patch: https://git.openjdk.java.net/jdk/pull/7986.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/7986/head:pull/7986 PR: https://git.openjdk.java.net/jdk/pull/7986
