fix for current codebase

include/xrpl/hook/guard_checker.cpp

@@ -0,0 +1,93 @@
+#include "Guard.h"
+#include <fcntl.h>
+#include <iostream>
+#include <optional>
+#include <ostream>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <string_view>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <vector>
+
+int
+main(int argc, char** argv)
+{
+    const char* fin = 0;
+
+    if (argc > 2)
+        return fprintf(
+            stderr, "Guard Checker\n\tUsage: %s somefile.wasm\n", argv[0]);
+    else if (argc == 1)
+        fin = "-";
+    else
+        fin = argv[1];
+
+    int fd = 0;
+    if (strcmp(fin, "-") != 0)
+        fd = open(fin, O_RDONLY);
+
+    if (fd < 0)
+        return fprintf(stderr, "Could not open file for reading:`%s`\n", fin);
+
+    off_t len = fd == 0 ? 0 : lseek(fd, 0, SEEK_END);
+
+    if (fd != 0)
+        lseek(fd, 0, SEEK_SET);
+
+    int length_known = len > 0;
+
+    uint8_t hook_data[0x100000U];
+
+    uint8_t* ptr = hook_data;
+
+    size_t upto = 0;
+
+    fcntl(fd, F_SETFL, fcntl(0, F_GETFL) & ~O_NONBLOCK);
+
+    while (ptr - hook_data < sizeof(hook_data))
+    {
+        if (length_known)
+        {
+            if (upto >= len)
+                break;
+        }
+        else
+            len = upto + 1;
+
+        size_t bytes_read = read(fd, ptr + upto, len - upto);
+
+        if (!length_known && bytes_read == 0)
+            break;
+
+        if (bytes_read < 0)
+            return fprintf(
+                stderr,
+                "Error reading file `%s`, only %ld bytes could be read\n",
+                fin,
+                upto);
+
+        upto += bytes_read;
+    }
+
+    std::vector<uint8_t> hook(upto);
+    memcpy(hook.data(), hook_data, upto);
+
+    printf("Read %ld bytes from `%s` successfully...\n", upto, fin);
+
+    close(fd);
+
+    auto result = validateGuards(hook, std::cout, "", 3);
+
+    if (!result)
+    {
+        printf("Hook validation failed.\n");
+        return 1;
+    }
+
+    printf("\nHook validation successful!\n");
+
+    return 0;
+}