first commit

platform.h

@@ -0,0 +1,157 @@
+#pragma once
+
+#if defined(_WIN32) || defined(_WIN64)
+#define PLATFORM_WINDOWS 1
+#include <stdatomic.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include <aclapi.h>
+#include <fcntl.h>
+#include <io.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <windows.h>
+#else
+#include <stdatomic.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <pwd.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#endif
+
+#define XXH_VECTOR XXH_AVX2 //don't compile with gcc see xxhash.h line 4082
+#define XXH_INLINE_ALL
+#include "xxhash.c"
+#include "xxhash.h"
+
+// ----------------------------- Config -------------------------------------
+#define FILE_LIST_TXT "file_list.txt"
+#define FILE_HASHES_TXT "file_hashes.txt"
+#define HASH_STRLEN 33 // 128-bit hex (32 chars) + null
+#define MAX_PATHLEN 4096
+#define READ_BLOCK (64 * 1024) // 64KB blocks
+
+// ----------------------------- Data types ---------------------------------
+typedef struct FileEntry {
+  char *path;
+
+  uint64_t size_bytes;
+  uint64_t created_time;  // epoch
+  uint64_t modified_time; // epoch seconds
+  char owner[128];        // resolved owner name
+} FileEntry;
+
+/* File path and metadata */
+static void normalize_path(char *p) {
+  char *src = p;
+  char *dst = p;
+  int prev_slash = 0;
+
+  while (*src) {
+    char c = *src++;
+
+    if (c == '\\' || c == '/') {
+      if (!prev_slash) {
+        *dst++ = '/';
+        prev_slash = 1;
+      }
+    } else {
+      *dst++ = c;
+      prev_slash = 0;
+    }
+  }
+
+  *dst = '\0';
+}
+
+void platform_get_file_times(const char *path, uint64_t *out_created,
+                             uint64_t *out_modified);
+void platform_get_file_owner(const char *path, char *out_owner,
+                             size_t out_owner_size);
+
+/* scan folder timer*/
+typedef struct {
+  LARGE_INTEGER start;
+  LARGE_INTEGER end;
+} HiResTimer;
+
+static LARGE_INTEGER g_qpc_freq;
+
+static void timer_init(void) { QueryPerformanceFrequency(&g_qpc_freq); }
+
+static void timer_start(HiResTimer *t) { QueryPerformanceCounter(&t->start); }
+
+static double timer_stop(HiResTimer *t) {
+  QueryPerformanceCounter(&t->end);
+  return (double)(t->end.QuadPart - t->start.QuadPart) /
+         (double)g_qpc_freq.QuadPart;
+}
+
+/* Scan folders */
+typedef struct EntryBuffer {
+  FileEntry *entries;
+  size_t count;
+  size_t capacity;
+} EntryBuffer;
+
+typedef struct DirQueue DirQueue;
+
+void scan_folder_windows_parallel(const char *base, DirQueue *q,
+                                  EntryBuffer *buf);
+void scan_folder_posix_parallel(const char *base, DirQueue *q);
+
+typedef struct DirJob {
+  char *path;
+  struct DirJob *next;
+} DirJob;
+
+typedef struct DirQueue {
+  char **items;
+  size_t count;
+  size_t cap;
+  size_t active;
+
+  int stop;
+
+#if PLATFORM_WINDOWS
+  CRITICAL_SECTION cs;
+  CONDITION_VARIABLE cv;
+#else
+  pthread_mutex_t mutex;
+  pthread_cond_t cond;
+#endif
+} DirQueue;
+
+/* Hashing */
+typedef struct Job {
+  FileEntry *file;
+  struct Job *next;
+} Job;
+
+typedef struct {
+  Job *head;
+  Job *tail;
+  CRITICAL_SECTION cs;
+  CONDITION_VARIABLE cv;
+  atomic_size_t count; // queued jobs
+  int stop;
+} JobQueue;
+
+typedef struct {
+  JobQueue *queue;
+  atomic_size_t *done_counter;
+  size_t total_jobs;
+  atomic_int *live_workers;
+} WorkerArg;