more readme, some renaming

README

@@ -1 +1,24 @@
 noisebox -- a FUSE filesystem that contains predictable PRNG output.
+
+
+Requirements
+---
+
+Pretty light.  Tested to compile on Fedora and Ubuntu.  Requires a
+compiler and associated toolchain.
+
+Required packages:
+
+ * libfuse-devel
+
+Required non-packages (as of this writing):
+
+ * pcg-c [https://github.com/imneme/pcg-c]
+
+
+ TODO
+ ---
+
+ * Add some unit tests.
+ * Fix mersenne output.
+ * Profile memory usage.  I suspect there are leaks.

fuse.c

@@ -196,10 +196,12 @@ static int do_open(const char* path, struct fuse_file_info* fi) {
     }
 
     // check if file is already opened.
-    get_file_state(path, fi);
+    // never mind, we want to support multiple concurrent reads from
-    if(fi->fh) {
+    // the same file.
-        return 0;
+    // get_file_state(path, fi);
-    }
+    // if(fi->fh) {
+    //     return 0;
+    // }
 
     if(n->do_open) {
         ret = n->do_open(path, fi);

mersenne.c

@@ -34,17 +34,17 @@ enum {
 
 
 // state for single generator.
-struct mt_state {
+typedef struct mt_random_t {
     uint32_t mt[N];
     int index;
     off_t begin;
     size_t consumed;
     char overflow[4];
     int overflow_len;
-};
+} mt_random_t;
 
 
-static void twist(struct mt_state *state) {
+static void twist(mt_random_t *state) {
     uint32_t i, x, xA;
     uint32_t *mt = state->mt;
 
@@ -60,7 +60,7 @@ static void twist(struct mt_state *state) {
     state->index = 0;
 }
 
-static void mt_init(struct mt_state *state, const uint32_t seed) {
+static void mt_init(mt_random_t *state, const uint32_t seed) {
     uint32_t i;
     uint32_t *mt = state->mt;
     mt[0] = seed;
@@ -72,7 +72,7 @@ static void mt_init(struct mt_state *state, const uint32_t seed) {
     twist(state);
 }
 
-static uint32_t extract_u32(struct mt_state *state) {
+static uint32_t extract_u32(mt_random_t *state) {
     uint32_t y;
 
     if(state->index >= N) {
@@ -111,7 +111,7 @@ static int get_noise(size_t n, off_t offset, char* buf,
     printf("getting random bits: %i@%i (%i)\n", n, offset, n*sizeof(char));
 
     // FIXME this is wrong.
-    struct mt_state *state = (struct mt_state *)(fi->fh);
+    mt_random_t *state = (mt_random_t *)(fi->fh);
     float buf_ratio = (float)sizeof(char)/(float)sizeof(uint32_t);
     if(offset != state->consumed * buf_ratio) {
         printf("wrong offset, discarding state\n");

pcg.c

@@ -39,7 +39,7 @@ static int do_open(const char *path, struct fuse_file_info *fi) {
 }
 
 static int do_release(const char *path, struct fuse_file_info *fi) {
-    free((void *)fi->fh);
+    free((void *)(fi->fh));
     return 0;
 }