Remove binary files from the released crates.io version (#138)

This commit removes the `well_known_types.bin` file from the crates.io
release. Instead of bundling and parsing this file at runtime this
commit hard codes the parsed data structure as rust code. This hopefully
makes it easier to inspect the generated code.

prost-reflect/Cargo.toml

@@ -15,8 +15,10 @@ exclude = [
     "**/tests.rs",
     "proptest-regressions",
     "src/file_descriptor_set.bin",
+    "src/well_known_types.bin",
     "src/doctest.proto",
-    "tests"
+    "tests",
+    "doc/*.bin",
 ]
 
 [[test]]

prost-reflect/src/descriptor/build/mod.rs

@@ -101,7 +101,7 @@ impl DescriptorPoolOffsets {
 }
 
 impl DescriptorPool {
-    pub(super) fn build_files<I>(&mut self, files: I) -> Result<(), DescriptorError>
+    pub(crate) fn build_files<I>(&mut self, files: I) -> Result<(), DescriptorError>
     where
         I: IntoIterator<Item = FileDescriptorProto>,
     {

prost-reflect/src/descriptor/global.rs

@@ -4,10 +4,10 @@ use once_cell::sync::Lazy;
 use prost::bytes::Buf;
 use prost_types::FileDescriptorProto;
 
-use crate::{reflect::WELL_KNOWN_TYPES_BYTES, DescriptorError, DescriptorPool};
+use crate::{DescriptorError, DescriptorPool};
 
 static INSTANCE: Lazy<Mutex<DescriptorPool>> =
-    Lazy::new(|| Mutex::new(DescriptorPool::decode(WELL_KNOWN_TYPES_BYTES).unwrap()));
+    Lazy::new(|| Mutex::new(crate::reflect::make_wkt_descriptor_pool().unwrap()));
 
 impl DescriptorPool {
     /// Gets a copy of the global descriptor pool. By default, this just contains the google well-known types.

prost-reflect/src/descriptor/mod.rs

@@ -5,7 +5,7 @@ mod global;
 mod tag;
 #[cfg(test)]
 mod tests;
-mod types;
+pub(crate) mod types;
 
 pub use self::error::DescriptorError;
 use self::types::{DescriptorProto, EnumDescriptorProto};

prost-reflect/src/descriptor/types.rs

@@ -498,7 +498,7 @@ impl<T> Options<T>
 where
     T: Message + Clone,
 {
-    fn from_prost(options: T) -> Self {
+    pub(crate) fn from_prost(options: T) -> Self {
         Options {
             encoded: options.encode_to_vec(),
             value: options,

prost-reflect/src/reflect/mod.rs

@@ -1,6 +1,6 @@
 mod wkt;
 
-pub(crate) use wkt::WELL_KNOWN_TYPES_BYTES;
+pub(crate) use wkt::make_wkt_descriptor_pool;
 
 use prost::Message;