add reading and writing binaries to C API (#443)

2 files changed, 28 insertions, 0 deletions

diff --git a/src/binaryen-c.cpp b/src/binaryen-c.cpp
index a876c998b..d46125bb3 100644
--- a/src/binaryen-c.cpp
+++ b/src/binaryen-c.cpp
@@ -21,6 +21,7 @@
 #include "binaryen-c.h"
 #include "pass.h"
 #include "wasm.h"
+#include "wasm-binary.h"
 #include "wasm-builder.h"
 #include "wasm-printing.h"
 #include "wasm-validator.h"
@@ -398,6 +399,26 @@ void BinaryenModuleOptimize(BinaryenModuleRef module) {
   passRunner.run();
 }
 
+size_t BinaryenModuleWrite(BinaryenModuleRef module, char* output, size_t outputSize) {
+  Module* wasm = (Module*)module;
+  BufferWithRandomAccess buffer(false);
+  WasmBinaryWriter writer(wasm, buffer, false);
+  writer.write();
+  size_t bytes = std::min(buffer.size(), outputSize);
+  std::copy_n(buffer.begin(), bytes, output);
+  return bytes;
+}
+
+BinaryenModuleRef BinaryenModuleRead(char* input, size_t inputSize) {
+  auto* wasm = new Module;
+  std::vector<char> buffer(false);
+  buffer.resize(inputSize);
+  std::copy_n(input, inputSize, buffer.begin());
+  WasmBinaryBuilder parser(*wasm, buffer, false);
+  parser.read();
+  return wasm;
+}
+
 //
 // ========== CFG / Relooper ==========
 //
diff --git a/src/binaryen-c.h b/src/binaryen-c.h
index 9319de209..da445dfb2 100644
--- a/src/binaryen-c.h
+++ b/src/binaryen-c.h
@@ -273,6 +273,13 @@ int BinaryenModuleValidate(BinaryenModuleRef module);
 // Run the standard optimization passes on the module.
 void BinaryenModuleOptimize(BinaryenModuleRef module);
 
+// Serialize a module into binary form.
+// @return how many bytes were written. This will be less than or equal to bufferSize
+size_t BinaryenModuleWrite(BinaryenModuleRef module, char* output, size_t outputSize);
+
+// Deserialize a module from binary form.
+BinaryenModuleRef BinaryenModuleRead(char* input, size_t inputSize);
+
 //
 // ========== CFG / Relooper ==========
 //