Squashed 'external/toxcore/c-toxcore/' content from commit 67badf69

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 67badf69416a74e74f6d7eb51dd96f37282b8455

toxcore/state.c

@@ -0,0 +1,154 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later
+ * Copyright © 2016-2020 The TokTok team.
+ * Copyright © 2014 Tox project.
+ */
+#include "state.h"
+
+#include <string.h>
+
+#include "ccompat.h"
+
+/** state load/save */
+int state_load(const Logger *log, state_load_cb *state_load_callback, void *outer,
+               const uint8_t *data, uint32_t length, uint16_t cookie_inner)
+{
+    if (state_load_callback == nullptr || data == nullptr) {
+        LOGGER_ERROR(log, "state_load() called with invalid args.");
+        return -1;
+    }
+
+
+    const uint32_t size_head = sizeof(uint32_t) * 2;
+
+    while (length >= size_head) {
+        uint32_t length_sub;
+        lendian_bytes_to_host32(&length_sub, data);
+
+        uint32_t cookie_type;
+        lendian_bytes_to_host32(&cookie_type, data + sizeof(uint32_t));
+
+        data += size_head;
+        length -= size_head;
+
+        if (length < length_sub) {
+            /* file truncated */
+            LOGGER_ERROR(log, "state file too short: %u < %u", length, length_sub);
+            return -1;
+        }
+
+        if (lendian_to_host16(cookie_type >> 16) != cookie_inner) {
+            /* something is not matching up in a bad way, give up */
+            LOGGER_ERROR(log, "state file garbled: %04x != %04x", cookie_type >> 16, cookie_inner);
+            return -1;
+        }
+
+        const uint16_t type = lendian_to_host16(cookie_type & 0xFFFF);
+
+        switch (state_load_callback(outer, data, length_sub, type)) {
+            case STATE_LOAD_STATUS_CONTINUE: {
+                data += length_sub;
+                length -= length_sub;
+                break;
+            }
+
+            case STATE_LOAD_STATUS_ERROR: {
+                LOGGER_ERROR(log, "Error occcured in state file (type: %u).", type);
+                return -1;
+            }
+
+            case STATE_LOAD_STATUS_END: {
+                return 0;
+            }
+        }
+    }
+
+    if (length != 0) {
+        LOGGER_ERROR(log, "unparsed data in state file of length %u", length);
+        return -1;
+    }
+
+    return 0;
+}
+
+uint8_t *state_write_section_header(uint8_t *data, uint16_t cookie_type, uint32_t len, uint32_t section_type)
+{
+    host_to_lendian_bytes32(data, len);
+    data += sizeof(uint32_t);
+    host_to_lendian_bytes32(data, (host_to_lendian16(cookie_type) << 16) | host_to_lendian16(section_type));
+    data += sizeof(uint32_t);
+    return data;
+}
+
+uint16_t lendian_to_host16(uint16_t lendian)
+{
+#ifdef WORDS_BIGENDIAN
+    return (lendian << 8) | (lendian >> 8);
+#else
+    return lendian;
+#endif
+}
+
+uint16_t host_to_lendian16(uint16_t host)
+{
+    return lendian_to_host16(host);
+}
+
+void host_to_lendian_bytes64(uint8_t *dest, uint64_t num)
+{
+#ifdef WORDS_BIGENDIAN
+    num = ((num << 8) & 0xFF00FF00FF00FF00) | ((num >> 8) & 0xFF00FF00FF00FF);
+    num = ((num << 16) & 0xFFFF0000FFFF0000) | ((num >> 16) & 0xFFFF0000FFFF);
+    num = (num << 32) | (num >> 32);
+#endif
+    memcpy(dest, &num, sizeof(uint64_t));
+}
+
+void lendian_bytes_to_host64(uint64_t *dest, const uint8_t *lendian)
+{
+    uint64_t d;
+    memcpy(&d, lendian, sizeof(uint64_t));
+#ifdef WORDS_BIGENDIAN
+    d = ((d << 8) & 0xFF00FF00FF00FF00) | ((d >> 8) & 0xFF00FF00FF00FF);
+    d = ((d << 16) & 0xFFFF0000FFFF0000) | ((d >> 16) & 0xFFFF0000FFFF);
+    d = (d << 32) | (d >> 32);
+#endif
+    *dest = d;
+}
+
+void host_to_lendian_bytes32(uint8_t *dest, uint32_t num)
+{
+#ifdef WORDS_BIGENDIAN
+    num = ((num << 8) & 0xFF00FF00) | ((num >> 8) & 0xFF00FF);
+    num = (num << 16) | (num >> 16);
+#endif
+    memcpy(dest, &num, sizeof(uint32_t));
+}
+
+void lendian_bytes_to_host32(uint32_t *dest, const uint8_t *lendian)
+{
+    uint32_t d;
+    memcpy(&d, lendian, sizeof(uint32_t));
+#ifdef WORDS_BIGENDIAN
+    d = ((d << 8) & 0xFF00FF00) | ((d >> 8) & 0xFF00FF);
+    d = (d << 16) | (d >> 16);
+#endif
+    *dest = d;
+}
+
+void host_to_lendian_bytes16(uint8_t *dest, uint16_t num)
+{
+#ifdef WORDS_BIGENDIAN
+    num = (num << 8) | (num >> 8);
+#endif
+    memcpy(dest, &num, sizeof(uint16_t));
+}
+
+void lendian_bytes_to_host16(uint16_t *dest, const uint8_t *lendian)
+{
+    uint16_t d;
+    memcpy(&d, lendian, sizeof(uint16_t));
+#ifdef WORDS_BIGENDIAN
+    d = (d << 8) | (d >> 8);
+#endif
+    *dest = d;
+}