From bd6f48ebe79c5df764de616bec55dc284eb91210 Mon Sep 17 00:00:00 2001
From: Joel Klinghed <the_jk@yahoo.com>
Date: Wed, 9 Aug 2017 23:52:15 +0200
Subject: Break out tpp load and save methods

---
 src/packages.cc | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 src/packages.cc

(limited to 'src/packages.cc')

diff --git a/src/packages.cc b/src/packages.cc
new file mode 100644
index 0000000..0309df1
--- /dev/null
+++ b/src/packages.cc
@@ -0,0 +1,125 @@
+// -*- mode: c++; c-basic-offset: 2; -*-
+
+#include "common.hh"
+
+#include <istream>
+#include <memory>
+#include <ostream>
+#include <string.h>
+
+#include "data.hh"
+#include "packages.hh"
+
+namespace {
+
+class PackagesWriterImpl : public PackagesWriter {
+public:
+  PackagesWriterImpl(size_t count, std::ostream* out)
+    : count_(count), out_(out) {
+    uint8_t header[8];
+    memcpy(header, "TPP", 3);
+    header[3] = 0x1;  // Version
+    write_u32(header + 4, count_);  // Count
+    out->write(reinterpret_cast<char*>(header), 8);
+
+    if (count == 0) {
+      write_u64(header, 0);  // EOF
+      out_->write(reinterpret_cast<char*>(header), 8);
+    }
+  }
+
+  ~PackagesWriterImpl() {
+    assert(count_ == 0);
+  }
+
+  void write(Package const& package, std::string const& data) override {
+    if (count_ == 0) {
+      assert(false);
+      return;
+    }
+    uint8_t buf[8192];
+    std::unique_ptr<uint8_t[]> backup;
+    uint8_t* ptr = buf;
+    size_t need = write_package(package, buf, sizeof(buf));
+    if (need > sizeof(buf)) {
+      backup.reset(new uint8_t[need]);
+      ptr = backup.get();
+      write_package(package, ptr, need);
+    }
+    uint8_t size[8];
+    write_u64(size, need + data.size());
+    out_->write(reinterpret_cast<char*>(size), 8);
+    out_->write(reinterpret_cast<char*>(ptr), need);
+    backup.reset();
+    out_->write(data.data(), data.size());
+
+    if (--count_ == 0) {
+      write_u64(size, 0);  // EOF
+      out_->write(reinterpret_cast<char*>(size), 8);
+    }
+  }
+
+private:
+  size_t count_;
+  std::ostream* const out_;
+};
+
+}  // namespace
+
+// static
+PackagesWriter* PackagesWriter::create(size_t count, std::ostream* out) {
+  return new PackagesWriterImpl(count, out);
+}
+
+// static
+PackagesReader::Status PackagesReader::read(std::istream& in,
+                                            Delegate* delegate) {
+  uint8_t header[8];
+  in.read(reinterpret_cast<char*>(header), 8);
+  if (!in.good() || memcmp(header, "TPP", 3) || header[3] != 1) {
+    return INVALID;
+  }
+  auto count = read_u32(header + 4);
+  while (count--) {
+    in.read(reinterpret_cast<char*>(header), 8);
+    if (!in.good()) return IO_ERROR;
+    size_t size = read_u64(header);
+    if (size == 0) return INVALID;
+    uint8_t buf[8192];
+    size_t avail = std::min(size, sizeof(buf));
+    in.read(reinterpret_cast<char*>(buf), avail);
+    if (!in.good()) return IO_ERROR;
+    Package pkg;
+    auto pkg_size = read_package(&pkg, buf, avail);
+    if (pkg_size == 0) {
+      if (avail == size) return INVALID;
+      size_t need = std::min(static_cast<size_t>(1024) * 1024, size);
+      std::unique_ptr<uint8_t[]> mem(new uint8_t[need]);
+      memcpy(mem.get(), buf, avail);
+      in.read(reinterpret_cast<char*>(mem.get()) + avail, need - avail);
+      if (!in.good()) return IO_ERROR;
+      pkg_size = read_package(&pkg, mem.get(), need);
+      if (pkg_size == 0) return INVALID;
+      delegate->package(pkg);
+      delegate->data(pkg.id, reinterpret_cast<char*>(mem.get())
+                     + pkg_size, need - pkg_size, need == size);
+      size -= need;
+    } else {
+        delegate->package(pkg);
+        delegate->data(pkg.id, reinterpret_cast<char*>(buf) + pkg_size,
+                       avail - pkg_size, avail == size);
+        size -= avail;
+    }
+    while (size) {
+      avail = std::min(sizeof(buf), size);
+      in.read(reinterpret_cast<char*>(buf), avail);
+      if (!in.good()) return IO_ERROR;
+      delegate->data(pkg.id, reinterpret_cast<char*>(buf), avail,
+                     avail == size);
+      size -= avail;
+    }
+  }
+  in.read(reinterpret_cast<char*>(header), 8);
+  if (!in.good() || read_u64(header) != 0) return INVALID;
+  return GOOD;
+}
-- 
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