Initial commit

app/src/main/cpp/Woff2Converter.cpp

@@ -0,0 +1,56 @@
+#include <jni.h>
+#include <string>
+#include <vector>
+
+// This is the correct header for the public API
+#include <woff2/decode.h>
+
+extern "C" JNIEXPORT jbyteArray JNICALL
+Java_com_aryan_reader_paginatedreader_Woff2Converter_convertWoff2ToTtf(
+        JNIEnv *env,
+        jobject /* this */,
+        jbyteArray woff2_data) {
+
+    // Get the input WOFF2 data from the jbyteArray
+    jbyte* woff2_bytes = env->GetByteArrayElements(woff2_data, nullptr);
+    jsize woff2_size = env->GetArrayLength(woff2_data);
+    const uint8_t* woff2_input = reinterpret_cast<const uint8_t*>(woff2_bytes);
+
+    // Calculate the required size using the correct function name from your header
+    size_t ttf_size = woff2::ComputeWOFF2FinalSize(woff2_input, woff2_size);
+    if (ttf_size == 0) {
+        // This indicates an error in the input font data
+        env->ReleaseByteArrayElements(woff2_data, woff2_bytes, JNI_ABORT);
+        return nullptr;
+    }
+
+    // Create the output buffer
+    std::vector<uint8_t> ttf_output(ttf_size);
+
+    // Perform the conversion using the deprecated function signature that matches your header
+    bool success = woff2::ConvertWOFF2ToTTF(
+            ttf_output.data(), ttf_size,
+            woff2_input, woff2_size
+    );
+
+    // Release the input byte array
+    env->ReleaseByteArrayElements(woff2_data, woff2_bytes, JNI_ABORT);
+
+    // If conversion failed, return null
+    if (!success) {
+        return nullptr;
+    }
+
+    // Create a new Java byte array for the result
+    jbyteArray ttf_data = env->NewByteArray(ttf_size);
+    if (ttf_data == nullptr) {
+        // Out of memory error
+        return nullptr;
+    }
+
+    // Copy the converted data to the Java byte array
+    env->SetByteArrayRegion(ttf_data, 0, ttf_size,
+                            reinterpret_cast<const jbyte*>(ttf_output.data()));
+
+    return ttf_data;
+}