Merge branch 'master' of github.com:redpony/cdec

1 files changed, 77 insertions, 0 deletions

diff --git a/python/src/sa/float_list.pxi b/python/src/sa/float_list.pxi
new file mode 100644
index 00000000..88ffd5fc
--- /dev/null
+++ b/python/src/sa/float_list.pxi
@@ -0,0 +1,77 @@
+# defines int arrays in C, with some convenience methods
+# for reading arrays directly as globs directly from disk.
+# Adam Lopez <alopez@cs.umd.edu>
+
+from libc.stdio cimport FILE, fopen, fread, fwrite, fclose
+from libc.stdlib cimport malloc, realloc, free
+from libc.string cimport memset, strcpy, strlen
+
+cdef class FloatList:
+    cdef int size
+    cdef int increment
+    cdef int len
+    cdef float* arr
+
+    def __cinit__(self, int size=0, int increment=1, int initial_len=0):
+        if initial_len > size:
+            size = initial_len
+        self.size = size
+        self.increment = increment
+        self.len = initial_len
+        self.arr = <float*> malloc(size*sizeof(float))
+        memset(self.arr, 0, initial_len*sizeof(float))
+
+    def __dealloc__(self):
+        free(self.arr)
+
+    def __getitem__(self, i):
+        j = i
+        if i<0: 
+            j = self.len + i
+        if j<0 or j>=self.len:
+            raise IndexError("Requested index %d of %d-length FloatList" % (i, self.len))
+        return self.arr[j]
+
+    cdef void set(self, int i, float v):
+        j = i
+        if i<0: 
+            j = self.len + i
+        if j<0 or j>=self.len:
+            raise IndexError("Requested index %d of %d-length FloatList" % (i, self.len))
+        self.arr[j] = v
+    
+    def __setitem__(self, i, val):
+        self.set(i, val)
+
+    def __len__(self):
+        return self.len
+
+    def append(self, float val):
+        if self.len == self.size:
+            self.size = self.size + self.increment
+            self.arr = <float*> realloc(self.arr, self.size*sizeof(float))
+        self.arr[self.len] = val
+        self.len = self.len + 1
+
+    cdef void write_handle(self, FILE* f):
+        fwrite(&(self.len), sizeof(float), 1, f)
+        fwrite(self.arr, sizeof(float), self.len, f)
+
+    def write(self, char* filename):
+        cdef FILE* f
+        f = fopen(filename, "w")
+        self.write_handle(f)
+        fclose(f)
+
+    cdef void read_handle(self, FILE* f):
+        free(self.arr)
+        fread(&(self.len), sizeof(float), 1, f)
+        self.arr = <float*> malloc(self.len * sizeof(float))
+        self.size = self.len
+        fread(self.arr, sizeof(float), self.len, f)
+
+    def read(self, char* filename):
+        cdef FILE* f
+        f = fopen(filename, "r")
+        self.read_handle(f)
+        fclose(f)