Support for building and running external apps (#112)

TactilityCore/Source/file/File.cpp

@@ -0,0 +1,82 @@
+#include "File.h"
+
+namespace tt::file {
+
+#define TAG "file"
+
+long getSize(FILE* file) {
+    long original_offset = ftell(file);
+
+    if (fseek(file, 0, SEEK_END) != 0) {
+        TT_LOG_E(TAG, "fseek failed");
+        return -1;
+    }
+
+    long file_size = ftell(file);
+    if (file_size == -1) {
+        TT_LOG_E(TAG, "Could not get file length");
+        return -1;
+    }
+
+    if (fseek(file, original_offset, SEEK_SET) != 0) {
+        TT_LOG_E(TAG, "fseek Failed");
+        return -1;
+    }
+
+    return file_size;
+}
+
+static std::unique_ptr<uint8_t[]> readBinaryInternal(const char* filepath, size_t& outSize, size_t sizePadding = 0) {
+    FILE* file = fopen(filepath, "rb");
+
+    if (file == nullptr) {
+        TT_LOG_E(TAG, "Failed to open %s", filepath);
+        return nullptr;
+    }
+
+    long content_length = getSize(file);
+    if (content_length == -1) {
+        TT_LOG_E(TAG, "Failed to determine content length for %s", filepath);
+        return nullptr;
+    }
+
+    auto data = std::make_unique<uint8_t[]>(content_length + sizePadding);
+    if (data == nullptr) {
+        TT_LOG_E(TAG, "Insufficient memory. Failed to allocate %ldl bytes.", content_length);
+        return nullptr;
+    }
+
+    size_t buffer_offset = 0;
+    while (buffer_offset < content_length) {
+        size_t bytes_read = fread(&data.get()[buffer_offset], 1, content_length - buffer_offset, file);
+        TT_LOG_I(TAG, "Read %d bytes", bytes_read);
+        if (bytes_read > 0) {
+            buffer_offset += bytes_read;
+        } else { // Something went wrong?
+            data = nullptr;
+            break;
+        }
+    }
+
+    outSize = buffer_offset;
+
+    fclose(file);
+    return data;
+}
+
+std::unique_ptr<uint8_t[]> readBinary(const char* filepath, size_t& outSize) {
+    return readBinaryInternal(filepath, outSize);
+}
+
+std::unique_ptr<uint8_t[]> readString(const char* filepath) {
+    size_t size = 0;
+    auto data = readBinaryInternal(filepath, size, 1);
+    if (size > 0) {
+        data.get()[size] = 0; // Append null terminator
+        return data;
+    } else {
+        return nullptr;
+    }
+}
+
+}