Move utils for pickling into a separate file

1 files changed, 164 insertions, 0 deletions

diff --git a/include/axolotl/pickle.hh b/include/axolotl/pickle.hh
new file mode 100644
index 0000000..a2de4f0
--- /dev/null
+++ b/include/axolotl/pickle.hh
@@ -0,0 +1,164 @@
+#ifndef AXOLOTL_PICKLE_HH_
+#define AXOLOTL_PICKLE_HH_
+
+#include "axolotl/list.hh"
+#include "axolotl/crypto.hh"
+
+#include <cstring>
+#include <cstdint>
+
+namespace axolotl {
+
+static std::size_t pickle_length(
+    const std::uint32_t & value
+) {
+    return 4;
+}
+
+
+static std::uint8_t * pickle(
+    std::uint8_t * pos,
+    std::uint32_t value
+) {
+    pos += 4;
+    for (unsigned i = 4; i--;) { *(--pos) = value; value >>= 8; }
+    return pos + 4;
+}
+
+
+static std::uint8_t const * unpickle(
+    std::uint8_t const * pos, std::uint8_t const * end,
+    std::uint32_t & value
+) {
+    value = 0;
+    if (end - pos < 4) return end;
+    for (unsigned i = 4; i--;) { value <<= 8; value |= *(pos++); }
+    return pos;
+}
+
+static std::size_t pickle_length(
+    const bool & value
+) {
+    return 1;
+}
+
+
+static std::uint8_t * pickle(
+    std::uint8_t * pos,
+    bool value
+) {
+    *(pos++) = value ? 1 : 0;
+    return pos;
+}
+
+
+static std::uint8_t const * unpickle(
+    std::uint8_t const * pos, std::uint8_t const * end,
+    bool & value
+) {
+    if (pos == end) return end;
+    value = *(pos++);
+    return pos;
+}
+
+
+
+template<typename T, std::size_t max_size>
+std::size_t pickle_length(
+    axolotl::List<T, max_size> const & list
+) {
+    std::size_t length = pickle_length(std::uint32_t(list.size()));
+    for (auto const & value : list) {
+        length += pickle_length(value);
+    }
+    return length;
+}
+
+
+template<typename T, std::size_t max_size>
+std::uint8_t * pickle(
+    std::uint8_t * pos,
+    axolotl::List<T, max_size> const & list
+) {
+    pos = pickle(pos, std::uint32_t(list.size()));
+    for (auto const & value : list) {
+        pos = pickle(pos, value);
+    }
+    return pos;
+}
+
+
+template<typename T, std::size_t max_size>
+std::uint8_t const * unpickle(
+    std::uint8_t const * pos, std::uint8_t const * end,
+    axolotl::List<T, max_size> & list
+) {
+    std::uint32_t size;
+    pos = unpickle(pos, end, size);
+    while (size--) {
+        T * value = list.insert(list.end());
+        pos = unpickle(pos, end, *value);
+    }
+    return pos;
+}
+
+
+static std::uint8_t * pickle_bytes(
+    std::uint8_t * pos,
+    std::uint8_t const * bytes, std::size_t bytes_length
+) {
+    std::memcpy(pos, bytes, bytes_length);
+    return pos + bytes_length;
+}
+
+
+static std::uint8_t const * unpickle_bytes(
+    std::uint8_t const * pos, std::uint8_t const * end,
+    std::uint8_t * bytes, std::size_t bytes_length
+) {
+    if (end - pos < bytes_length) return end;
+    std::memcpy(bytes, pos, bytes_length);
+    return pos + bytes_length;
+}
+
+
+std::size_t pickle_length(
+    const Curve25519PublicKey & value
+);
+
+
+std::uint8_t * pickle(
+    std::uint8_t * pos,
+    const Curve25519PublicKey & value
+);
+
+
+std::uint8_t const * unpickle(
+    std::uint8_t const * pos, std::uint8_t const * end,
+    Curve25519PublicKey & value
+);
+
+
+std::size_t pickle_length(
+    const Curve25519KeyPair & value
+);
+
+
+std::uint8_t * pickle(
+    std::uint8_t * pos,
+    const Curve25519KeyPair & value
+);
+
+
+std::uint8_t const * unpickle(
+    std::uint8_t const * pos, std::uint8_t const * end,
+    Curve25519KeyPair & value
+);
+
+
+} // namespace axolotl
+
+
+
+
+#endif /* AXOLOTL_PICKLE_HH */