Version v0.3.26 - Change .state file to plain text instead of binary

otp

@@ -0,0 +1 @@
+./build/otp-x86_64

src/pads.c

@@ -89,7 +89,10 @@ int generate_pad(uint64_t size_bytes, int display_progress) {
     const char* pads_dir = get_current_pads_dir();
     struct statvfs stat;
     if (statvfs(pads_dir, &stat) == 0) {
-        uint64_t available_bytes = stat.f_bavail * stat.f_frsize;
+        // Use f_bfree (total free blocks) instead of f_bavail (available to non-root)
+        // This gives the actual free space on the filesystem, which is more accurate
+        // for removable media and user-owned directories
+        uint64_t available_bytes = stat.f_bfree * stat.f_frsize;
         double available_gb = (double)available_bytes / (1024.0 * 1024.0 * 1024.0);
         double required_gb = (double)size_bytes / (1024.0 * 1024.0 * 1024.0);
         
@@ -233,7 +236,25 @@ int read_state_offset(const char* pad_chksum, uint64_t* offset) {
     const char* pads_dir = get_current_pads_dir();
     snprintf(state_filename, sizeof(state_filename), "%s/%s.state", pads_dir, pad_chksum);
 
-    FILE* state_file = fopen(state_filename, "rb");
+    FILE* state_file = fopen(state_filename, "r");
+    if (!state_file) {
+        *offset = 0;
+        return 0;
+    }
+
+    // Try to read as text format first (new format)
+    char line[128];
+    if (fgets(line, sizeof(line), state_file)) {
+        // Check if it's text format (starts with "offset=")
+        if (strncmp(line, "offset=", 7) == 0) {
+            *offset = strtoull(line + 7, NULL, 10);
+            fclose(state_file);
+            return 0;
+        }
+        
+        // Not text format, try binary format (legacy)
+        fclose(state_file);
+        state_file = fopen(state_filename, "rb");
         if (!state_file) {
             *offset = 0;
             return 0;
@@ -244,8 +265,12 @@ int read_state_offset(const char* pad_chksum, uint64_t* offset) {
             *offset = 0;
             return 0;
         }
+        fclose(state_file);
+        return 0;
+    }
 
     fclose(state_file);
+    *offset = 0;
     return 0;
 }
 
@@ -254,12 +279,13 @@ int write_state_offset(const char* pad_chksum, uint64_t offset) {
     const char* pads_dir = get_current_pads_dir();
     snprintf(state_filename, sizeof(state_filename), "%s/%s.state", pads_dir, pad_chksum);
 
-    FILE* state_file = fopen(state_filename, "wb");
+    FILE* state_file = fopen(state_filename, "w");
     if (!state_file) {
         return 1;
     }
 
-    if (fwrite(&offset, sizeof(uint64_t), 1, state_file) != 1) {
+    // Write in text format for human readability
+    if (fprintf(state_file, "offset=%lu\n", offset) < 0) {
         fclose(state_file);
         return 1;
     }