initial commit

1 files changed, 54 insertions, 0 deletions

diff --git a/src/memory/memory.cc b/src/memory/memory.cc
new file mode 100644
index 0000000..59fb50f
--- /dev/null
+++ b/src/memory/memory.cc
@@ -0,0 +1,54 @@
+#include "memory/memory.hh"
+
+namespace memory {
+
+buffer_t read_buffer(const std::size_t num_bytes, const pid_t& pid,
+                     const void* const address) {
+    buffer_t buffer{num_bytes};
+    const struct iovec local {
+        .iov_base = std::data(buffer), .iov_len = std::size(buffer)
+    };
+    const struct iovec remote {
+        .iov_base = const_cast<void* const>(address), .iov_len = num_bytes
+    };
+
+    if (const auto read = process_vm_readv(pid, &local, 1, &remote, 1, 0);
+        static_cast<unsigned long>(read) != num_bytes) {
+
+        if (read == -1) {
+            throw std::runtime_error{"read fail - " +
+                                     std::string{strerror(errno)}};
+        }
+        throw std::runtime_error("read fail - not enough bytes read (" +
+                                 std::to_string(num_bytes) + " wanted, " +
+                                 std::to_string(read) + " read)");
+    }
+
+    return buffer;
+}
+
+void write_buffer(const buffer_t& buffer, const pid_t& pid,
+                  const void* const address) {
+    const struct iovec local {
+        .iov_base = (void*)std::data(buffer), .iov_len = std::size(buffer)
+    };
+    const struct iovec remote {
+        .iov_base = const_cast<void* const>(address),
+        .iov_len = std::size(buffer)
+    };
+
+    if (const auto written = process_vm_writev(pid, &local, 1, &remote, 1, 0);
+        static_cast<unsigned long>(written) != std::size(buffer)) {
+
+        if (written == -1) {
+            throw std::runtime_error{"write fail - " +
+                                     std::string{strerror(errno)}};
+        }
+        throw std::runtime_error("read fail - not enough bytes written (" +
+                                 std::to_string(std::size(buffer)) +
+                                 " wanted, " + std::to_string(written) +
+                                 " written)");
+    }
+}
+
+} // namespace memory