See src/README for the README that ships with snappy. Mozilla does not modify the actual snappy source with the exception of the 'snappy-stubs-public.h' header and one small patch to resolve implicit constructor warnings. We have replaced its build system with our own. Snappy comes from: https://github.com/google/snappy We are currently using revision: 1.2.0 To upgrade to a newer version: 1. Check out the new code using git. 2. Update 'snappy-stubs-public.h' in this directory with any changes that were made to 'snappy-stubs-public.h.in' in the new source. Note that we don't bother trying to detect the availability of sys/uio.h and unconditionally define the iovec type instead for all platforms. 3. Copy the major/minor/patch versions from 'CMakeLists.txt' into 'snappy-stubs-public.h'. 4. Copy all source files from the new version into the src subdirectory. The following are not needed: - 'CMakeLists.txt', 'snappy_benchmark.cc', 'snappy_test_data.cc', 'snappy_test_data.h', and 'snappy_test_tool.cc' files - 'cmake' subdirectory - 'docs' subdirectory - 'testdata' subdirectory - 'third_party' subdirectory 5. Update the revision stamp in this file. 6. Apply 01-explicit.patch.