add some testing scripts

hash_testing/new_testing/hash_funcs/jenkinsOAAT/bin_hash.c

@@ -0,0 +1,109 @@
+#include <inttypes.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define JOAAT_SEED UINT32_C(0x9e3779b9)
+
+static uint32_t jenkins_oaat(const unsigned char *data, size_t length)
+{
+    uint32_t hash = JOAAT_SEED;
+
+    for (size_t index = 0; index < length; ++index) {
+        hash += data[index];
+        hash += hash << 10;
+        hash ^= hash >> 6;
+    }
+
+    hash += hash << 3;
+    hash ^= hash >> 11;
+    hash += hash << 15;
+    return hash;
+}
+
+static int is_ascii_trailing_space(unsigned char character)
+{
+    return character == ' ' || character == '\t' || character == '\n' ||
+           character == '\r' || character == '\v' || character == '\f';
+}
+
+static int read_stdin(unsigned char **data, size_t *length)
+{
+    size_t capacity = 256;
+    unsigned char *buffer = malloc(capacity);
+
+    if (buffer == NULL) {
+        return -1;
+    }
+
+    *length = 0;
+    for (;;) {
+        size_t available = capacity - *length;
+        size_t bytes_read = fread(buffer + *length, 1, available, stdin);
+        *length += bytes_read;
+
+        if (bytes_read < available) {
+            if (ferror(stdin)) {
+                free(buffer);
+                return -1;
+            }
+            break;
+        }
+
+        if (capacity > SIZE_MAX / 2) {
+            free(buffer);
+            return -1;
+        }
+        capacity *= 2;
+
+        unsigned char *larger_buffer = realloc(buffer, capacity);
+        if (larger_buffer == NULL) {
+            free(buffer);
+            return -1;
+        }
+        buffer = larger_buffer;
+    }
+
+    *data = buffer;
+    return 0;
+}
+
+int main(int argc, char **argv)
+{
+    const unsigned char *word;
+    unsigned char *stdin_buffer = NULL;
+    size_t length;
+
+    if (argc > 2) {
+        fprintf(stderr, "usage: %s [ASCII_WORD]\n", argv[0]);
+        return EXIT_FAILURE;
+    }
+
+    if (argc == 2) {
+        word = (const unsigned char *)argv[1];
+        length = strlen(argv[1]);
+    } else {
+        if (read_stdin(&stdin_buffer, &length) != 0) {
+            fprintf(stderr, "failed to read input\n");
+            return EXIT_FAILURE;
+        }
+        word = stdin_buffer;
+    }
+
+    while (length > 0 && is_ascii_trailing_space(word[length - 1])) {
+        --length;
+    }
+
+    for (size_t index = 0; index < length; ++index) {
+        if (word[index] > 0x7f) {
+            fprintf(stderr, "input must contain ASCII characters only\n");
+            free(stdin_buffer);
+            return EXIT_FAILURE;
+        }
+    }
+
+    printf("%08" PRIx32 "\n", jenkins_oaat(word, length));
+    free(stdin_buffer);
+    return EXIT_SUCCESS;
+}

hash_testing/new_testing/hash_funcs/jenkinsOAAT/hash.c

@@ -0,0 +1,13 @@
+unsigned int hash(const char* str) {
+  unsigned int hash = 0x9e3779b9;
+  const unsigned char* p = (const unsigned char*)str;
+  while (*p) {
+    hash += *p++;
+    hash += (hash << 10);
+    hash ^= (hash >> 6);
+  }
+  hash += (hash << 3);
+  hash ^= (hash >> 11);
+  hash += (hash << 15);
+  return hash;
+}