split out the horrible unchecked buffer accessors

1 files changed, 264 insertions, 0 deletions

diff --git a/src/net/vomit.hpp b/src/net/vomit.hpp
new file mode 100644
index 0000000..3d3a07f
--- /dev/null
+++ b/src/net/vomit.hpp
@@ -0,0 +1,264 @@
+#ifndef TMWA_NET_VOMIT_HPP
+#define TMWA_NET_VOMIT_HPP
+//    vomit.hpp - sickening socket accessors
+//
+//    Copyright © ????-2004 Athena Dev Teams
+//    Copyright © 2004-2011 The Mana World Development Team
+//    Copyright © 2011-2014 Ben Longbons <b.r.longbons@gmail.com>
+//
+//    This file is part of The Mana World (Athena server)
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# include "fwd.hpp"
+
+# include "socket.hpp"
+
+template<class T>
+uint8_t *pod_addressof_m(T& structure)
+{
+    static_assert(is_trivially_copyable<T>::value, "Can only byte-copy POD-ish structs");
+    return &reinterpret_cast<uint8_t&>(structure);
+}
+
+template<class T>
+const uint8_t *pod_addressof_c(const T& structure)
+{
+    static_assert(is_trivially_copyable<T>::value, "Can only byte-copy POD-ish structs");
+    return &reinterpret_cast<const uint8_t&>(structure);
+}
+
+/// Read from the queue
+inline
+const void *RFIFOP(Session *s, size_t pos)
+{
+    return &s->rdata[s->rdata_pos + pos];
+}
+inline
+uint8_t RFIFOB(Session *s, size_t pos)
+{
+    return *static_cast<const uint8_t *>(RFIFOP(s, pos));
+}
+inline
+uint16_t RFIFOW(Session *s, size_t pos)
+{
+    return *static_cast<const uint16_t *>(RFIFOP(s, pos));
+}
+inline
+uint32_t RFIFOL(Session *s, size_t pos)
+{
+    return *static_cast<const uint32_t *>(RFIFOP(s, pos));
+}
+template<class T>
+void RFIFO_STRUCT(Session *s, size_t pos, T& structure)
+{
+    really_memcpy(pod_addressof_m(structure), static_cast<const uint8_t *>(RFIFOP(s, pos)), sizeof(T));
+}
+inline
+IP4Address RFIFOIP(Session *s, size_t pos)
+{
+    IP4Address o;
+    RFIFO_STRUCT(s, pos, o);
+    return o;
+}
+template<uint8_t len>
+inline
+VString<len-1> RFIFO_STRING(Session *s, size_t pos)
+{
+    const char *const begin = static_cast<const char *>(RFIFOP(s, pos));
+    const char *const end = begin + len-1;
+    const char *const mid = std::find(begin, end, '\0');
+    return XString(begin, mid, nullptr);
+}
+inline
+AString RFIFO_STRING(Session *s, size_t pos, size_t len)
+{
+    const char *const begin = static_cast<const char *>(RFIFOP(s, pos));
+    const char *const end = begin + len;
+    const char *const mid = std::find(begin, end, '\0');
+    return XString(begin, mid, nullptr);
+}
+inline
+void RFIFO_BUF_CLONE(Session *s, uint8_t *buf, size_t len)
+{
+    really_memcpy(buf, static_cast<const uint8_t *>(RFIFOP(s, 0)), len);
+}
+
+/// Read from an arbitrary buffer
+inline
+const void *RBUFP(const uint8_t *p, size_t pos)
+{
+    return p + pos;
+}
+inline
+uint8_t RBUFB(const uint8_t *p, size_t pos)
+{
+    return *static_cast<const uint8_t *>(RBUFP(p, pos));
+}
+inline
+uint16_t RBUFW(const uint8_t *p, size_t pos)
+{
+    return *static_cast<const uint16_t *>(RBUFP(p, pos));
+}
+inline
+uint32_t RBUFL(const uint8_t *p, size_t pos)
+{
+    return *static_cast<const uint32_t *>(RBUFP(p, pos));
+}
+template<class T>
+void RBUF_STRUCT(const uint8_t *p, size_t pos, T& structure)
+{
+    really_memcpy(pod_addressof_m(structure), p + pos, sizeof(T));
+}
+inline
+IP4Address RBUFIP(const uint8_t *p, size_t pos)
+{
+    IP4Address o;
+    RBUF_STRUCT(p, pos, o);
+    return o;
+}
+template<uint8_t len>
+inline
+VString<len-1> RBUF_STRING(const uint8_t *p, size_t pos)
+{
+    const char *const begin = static_cast<const char *>(RBUFP(p, pos));
+    const char *const end = begin + len-1;
+    const char *const mid = std::find(begin, end, '\0');
+    return XString(begin, mid, nullptr);
+}
+inline
+AString RBUF_STRING(const uint8_t *p, size_t pos, size_t len)
+{
+    const char *const begin = static_cast<const char *>(RBUFP(p, pos));
+    const char *const end = begin + len;
+    const char *const mid = std::find(begin, end, '\0');
+    return XString(begin, mid, nullptr);
+}
+
+
+/// Unused - check how much data can be written
+// the existence of this seems scary
+inline
+size_t WFIFOSPACE(Session *s)
+{
+    return s->max_wdata - s->wdata_size;
+}
+/// Write to the queue
+inline
+void *WFIFOP(Session *s, size_t pos)
+{
+    return &s->wdata[s->wdata_size + pos];
+}
+inline
+uint8_t& WFIFOB(Session *s, size_t pos)
+{
+    return *static_cast<uint8_t *>(WFIFOP(s, pos));
+}
+inline
+uint16_t& WFIFOW(Session *s, size_t pos)
+{
+    return *static_cast<uint16_t *>(WFIFOP(s, pos));
+}
+inline
+uint32_t& WFIFOL(Session *s, size_t pos)
+{
+    return *static_cast<uint32_t *>(WFIFOP(s, pos));
+}
+template<class T>
+void WFIFO_STRUCT(Session *s, size_t pos, T& structure)
+{
+    really_memcpy(static_cast<uint8_t *>(WFIFOP(s, pos)), pod_addressof_c(structure), sizeof(T));
+}
+inline
+IP4Address& WFIFOIP(Session *s, size_t pos)
+{
+    static_assert(is_trivially_copyable<IP4Address>::value, "That was the whole point");
+    return *static_cast<IP4Address *>(WFIFOP(s, pos));
+}
+inline
+void WFIFO_STRING(Session *s, size_t pos, XString str, size_t len)
+{
+    char *const begin = static_cast<char *>(WFIFOP(s, pos));
+    char *const end = begin + len;
+    char *const mid = std::copy(str.begin(), str.end(), begin);
+    std::fill(mid, end, '\0');
+}
+inline
+void WFIFO_ZERO(Session *s, size_t pos, size_t len)
+{
+    uint8_t *b = static_cast<uint8_t *>(WFIFOP(s, pos));
+    uint8_t *e = b + len;
+    std::fill(b, e, '\0');
+}
+inline
+void WFIFO_BUF_CLONE(Session *s, const uint8_t *buf, size_t len)
+{
+    really_memcpy(static_cast<uint8_t *>(WFIFOP(s, 0)), buf, len);
+}
+
+/// Write to an arbitrary buffer
+inline
+void *WBUFP(uint8_t *p, size_t pos)
+{
+    return p + pos;
+}
+inline
+uint8_t& WBUFB(uint8_t *p, size_t pos)
+{
+    return *static_cast<uint8_t *>(WBUFP(p, pos));
+}
+inline
+uint16_t& WBUFW(uint8_t *p, size_t pos)
+{
+    return *static_cast<uint16_t *>(WBUFP(p, pos));
+}
+inline
+uint32_t& WBUFL(uint8_t *p, size_t pos)
+{
+    return *static_cast<uint32_t *>(WBUFP(p, pos));
+}
+template<class T>
+void WBUF_STRUCT(uint8_t *p, size_t pos, T& structure)
+{
+    really_memcpy(p + pos, pod_addressof_c(structure), sizeof(T));
+}
+inline
+IP4Address& WBUFIP(uint8_t *p, size_t pos)
+{
+    return *static_cast<IP4Address *>(WBUFP(p, pos));
+}
+inline
+void WBUF_STRING(uint8_t *p, size_t pos, XString s, size_t len)
+{
+    char *const begin = static_cast<char *>(WBUFP(p, pos));
+    char *const end = begin + len;
+    char *const mid = std::copy(s.begin(), s.end(), begin);
+    std::fill(mid, end, '\0');
+}
+inline
+void WBUF_ZERO(uint8_t *p, size_t pos, size_t len)
+{
+    uint8_t *b = static_cast<uint8_t *>(WBUFP(p, pos));
+    uint8_t *e = b + len;
+    std::fill(b, e, '\0');
+}
+
+inline
+void RFIFO_WFIFO_CLONE(Session *rs, Session *ws, size_t len)
+{
+    really_memcpy(static_cast<uint8_t *>(WFIFOP(ws, 0)),
+            static_cast<const uint8_t *>(RFIFOP(rs, 0)), len);
+}
+
+#endif // TMWA_NET_VOMIT_HPP