diff --git a/ip_cores/parsing/src/rtl/file_to_axi.sv b/ip_cores/parsing/src/rtl/file_to_axi.sv
new file mode 100644
index 0000000..f7ad9d8
--- /dev/null
+++ b/ip_cores/parsing/src/rtl/file_to_axi.sv
@@ -0,0 +1,67 @@
+/*
+  This reads a binary or ASCII file and creates an AXI stream,
+  used for testbench purposes. Can optionally add in random flow control.
+  
+  Only binary is supported at this moment.
+  
+  Copyright (C) 2019  Benjamin Devlin and Zcash Foundation
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+module file_to_axi #(
+    parameter        HDR_BYTS,
+    parameter        DAT_BYTS,
+    parameter        BINARY,      // 0 for ASCII, 1 for binary
+    parameter string FILE = "",   // Path to file
+    parameter        FP = 0       // Forward pressure, if this is non-zero then this is the % of cycles o_axi.val will be low
+) (
+  input i_clk, i_rst,
+  if_axi_stream.source   o_axi
+);
+  
+  
+logic [DAT_BYTS*8-1:0] data_temp;
+integer                fp, r;
+logic                  sop_l;
+
+initial begin
+  o_axi.reset_source();
+  sop_l = 0;
+  fp = $fopen(FILE, BINARY ? "rb" : "r");
+  if (fp==0) $fatal(1, "%m %t ERROR: file_to_axi could not open file %s", $time, FILE);
+  
+  if (BINARY == 0) begin
+    $fatal(1, "%m %t ERROR: file_to_axi BINARY == 0 not supported", $time);
+  end else begin
+    while(!$feof(fp)) begin            
+      r = $fread(o_axi.dat, fp);
+      o_axi.val = 1; // TODO
+      o_axi.sop = ~sop_l;
+      sop_l = 1;
+      o_axi.eop = $feof(fp);
+      o_axi.mod = $feof(fp) ? r : 0;
+      
+      @(posedge o_axi.clk);
+      while (!(o_axi.val && o_axi.rdy)) @(posedge o_axi.clk);
+    end
+  end
+  
+
+  o_axi.reset_source();
+  $display("%m %t INFO: file_to_axi finished reading file %s", $time, FILE);
+  $fclose(fp);
+end
+
+endmodule
\ No newline at end of file
diff --git a/ip_cores/parsing/src/rtl/header_adder.sv b/ip_cores/parsing/src/rtl/header_adder.sv
new file mode 100644
index 0000000..bcbc391
--- /dev/null
+++ b/ip_cores/parsing/src/rtl/header_adder.sv
@@ -0,0 +1,67 @@
+/*
+  This takes in a AXI stream, appends a header, and outputs the resulting stream.
+  
+  Copyright (C) 2019  Benjamin Devlin and Zcash Foundation
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+module header_adder #(
+    parameter HDR_BYTS,
+    parameter DAT_BYTS
+) (
+  input i_clk, i_rst,
+  
+  input [HDR_BYTS*8-1:0] i_header,  // Must be valid during i_axi.val
+  if_axi_stream.sink     i_axi,
+  if_axi_stream.source   o_axi
+);
+  
+logic [(DAT_BYTS+(HDR_BYTS % DAT_BYTS))*8-1:0] dat_buff;
+logic sop_l;
+logic [$clog2(HDR_BYTS)-1:0] hdr_cnt;
+
+always_comb begin
+  i_axi.dat = dat_buff[HDR_BYTS*8 +: DAT_BYTS*8];
+end
+
+always_ff @ (posedge i_clk) begin
+  if (i_rst) begin
+    dat_buff <= 0;
+    hdr_cnt <= 0;
+    i_axi.rdy <= 0;
+    sop_l <= 0;
+    o_axi.reset_source();
+  end else begin
+    i_axi.rdy <= o_axi.rdy && (hdr_cnt + DAT_BYTS >= HDR_BYTS);
+    if (~o_axi.val || (~o_axi.val && o_axi.rdy)) begin
+      o_axi.sop <= ~sop_l;
+      o_axi.val <= i_axi.val;
+      o_axi.err <= i_axi.err;
+      o_axi.ctl <= i_axi.ctl;
+      o_axi.mod <= (i_axi.mod + HDR_BYTS) % DAT_BYTS;
+      o_axi.eop <= i_axi.eop;
+      hdr_cnt <= (hdr_cnt + DAT_BYTS >= HDR_BYTS) ? hdr_cnt : hdr_cnt + DAT_BYTS;
+      sop_l <= i_axi.sop;
+      //TODO
+      dat_buff <= {dat_buff[0 +: (HDR_BYTS % DAT_BYTS)*8], i_axi.dat};
+      
+      
+      if (i_axi.eop) hdr_cnt <= 0;
+      
+    end
+  end
+end
+  
+endmodule
\ No newline at end of file