--- /dev/null
+//-----------------------------------------------------------------------------
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Flasher frontend tool
+//-----------------------------------------------------------------------------
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "sleep.h"
+#include "proxmark3.h"
+#include "flash.h"
+#include "uart.h"
+#include "usb_cmd.h"
+
+#define MAX(a,b) ((a)>(b)?(a):(b))
+
+struct huffman_record {
+ int16_t symbol;
+ uint16_t count;
+ uint8_t code_size;
+ uint8_t code;
+ struct huffman_record *left;
+ struct huffman_record *right;
+ struct huffman_record *next;
+ };
+
+typedef struct huffman_record huffman_record_t;
+
+#define FPGA_CONFIG_SIZE 42175
+static uint8_t fpga_config[FPGA_CONFIG_SIZE];
+static huffman_record_t leaf_nodes[256];
+static uint8_t start_code[256];
+
+static void usage(char *argv0)
+{
+ fprintf(stderr, "Usage: %s [-d] <infile> <outfile>\n\n", argv0);
+ fprintf(stderr, "\t-d\tdecompress\n\n");
+}
+
+
+void add_to_heap(huffman_record_t **heap, huffman_record_t *new_record)
+{
+ huffman_record_t *succ = *heap;
+ huffman_record_t *pred = NULL;
+
+// fprintf(stderr, "Adding symbol %d, count %d\n", new_record->symbol, new_record->count);
+
+ while (succ != NULL && new_record->count > succ->count) {
+ pred = succ;
+ succ = succ->next;
+ }
+
+ // insert new record
+ new_record->next = succ;
+ if (pred == NULL) { // first record in heap
+ *heap = new_record;
+ } else {
+ pred->next = new_record;
+ }
+}
+
+
+uint16_t set_codesize(huffman_record_t *tree_ptr, uint8_t depth)
+{
+ uint16_t max_size = depth;
+ tree_ptr->code_size = depth;
+ if (tree_ptr->left != NULL) {
+ max_size = MAX(set_codesize(tree_ptr->left, depth+1), max_size);
+ }
+ if (tree_ptr->right != NULL) {
+ max_size = MAX(set_codesize(tree_ptr->right, depth+1), max_size);
+ }
+ return max_size;
+}
+
+int huffman_encode(FILE *infile, FILE *outfile)
+{
+ int i;
+
+ // init leaf_nodes:
+ for (i = 0; i < 256; i++) {
+ leaf_nodes[i].count = 0;
+ leaf_nodes[i].symbol = i;
+ leaf_nodes[i].left = NULL;
+ leaf_nodes[i].right = NULL;
+ leaf_nodes[i].next = NULL;
+ }
+
+ // read the input file into fpga_config[] and count occurrences of each symbol:
+ i = 0;
+ while(!feof(infile)) {
+ uint8_t c;
+ c = fgetc(infile);
+ fpga_config[i++] = c;
+ leaf_nodes[c].count++;
+ if (i > FPGA_CONFIG_SIZE+1) {
+ fprintf(stderr, "Input file too big (> %d bytes). This is probably not a PM3 FPGA config file.", FPGA_CONFIG_SIZE);
+ fclose(infile);
+ fclose(outfile);
+ return -1;
+ }
+ }
+
+ fprintf(stderr, "\nStatistics: (symbol: count)\n");
+ for (i = 0; i < 256; i++) {
+ fprintf(stderr, "%3d: %5d\n", i, leaf_nodes[i].count);
+ }
+
+ // build the Huffman tree:
+ huffman_record_t *heap_ptr = NULL;
+
+ for (i = 0; i < 256; i++) {
+ add_to_heap(&heap_ptr, &leaf_nodes[i]);
+ }
+
+ fprintf(stderr, "\nSorted statistics: (symbol: count)\n");
+ for (huffman_record_t *p = heap_ptr; p != NULL; p = p->next) {
+ fprintf(stderr, "%3d: %5d\n", p->symbol, p->count);
+ }
+
+ for (i = 0; i < 255; i++) {
+ // remove and combine the first two nodes
+ huffman_record_t *p1, *p2;
+ p1 = heap_ptr;
+ p2 = heap_ptr->next;
+ heap_ptr = p2->next;
+ huffman_record_t *new_node = malloc(sizeof(huffman_record_t));
+ new_node->left = p1;
+ new_node->right = p2;
+ new_node->count = p1->count + p2->count;
+ add_to_heap(&heap_ptr, new_node);
+ }
+
+ uint16_t max_codesize = set_codesize(heap_ptr, 0);
+
+ fprintf(stderr, "\nStatistics: (symbol: count, codesize)\n");
+ uint32_t compressed_size = 0;
+ for (i = 0; i < 256; i++) {
+ fprintf(stderr, "%3d: %5d, %d\n", leaf_nodes[i].symbol, leaf_nodes[i].count, leaf_nodes[i].code_size);
+ compressed_size += leaf_nodes[i].count * leaf_nodes[i].code_size;
+ }
+ fprintf(stderr, "Compressed size = %ld (%f% of original size)", (compressed_size+7)/8, (float)(compressed_size)/(FPGA_CONFIG_SIZE * 8) * 100);
+ fprintf(stderr, "Max Codesize = %d bits", max_codesize);
+
+ uint8_t code = 0;
+ for (i = max_codesize; i > 0; i--) {
+ code = (code + 1) >> 1;
+ start_code[i] = code;
+ for (uint16_t j = 0; j < 256; j++) {
+ if (leaf_nodes[j].code_size == i) {
+ leaf_nodes[j].code = code;
+ code++;
+ }
+ }
+ }
+
+
+ fprintf(stderr, "\nStatistics: (symbol: count, codesize, code)\n");
+ for (i = 0; i < 256; i++) {
+ fprintf(stderr, "%3d: %5d, %d, %02x\n", leaf_nodes[i].symbol, leaf_nodes[i].count, leaf_nodes[i].code_size, leaf_nodes[i].code);
+ }
+
+ fclose(infile);
+ fclose(outfile);
+
+ return 0;
+}
+
+int huffman_decode(FILE *infile, FILE *outfile)
+{
+ return 0;
+}
+
+
+int main(int argc, char **argv)
+{
+ bool decode = false;
+ char *infilename;
+ char *outfilename;
+
+ if (argc < 3) {
+ usage(argv[0]);
+ return -1;
+ }
+
+ if (argc > 3) {
+ if (!strcmp(argv[1], "-d")) {
+ decode = true;
+ infilename = argv[2];
+ outfilename = argv[3];
+ } else {
+ usage(argv[0]);
+ return -1;
+ }
+ } else {
+ infilename = argv[1];
+ outfilename = argv[2];
+ }
+
+ FILE *infile = fopen(infilename, "rb");
+ if (infile == NULL) {
+ fprintf(stderr, "Error. Cannot open input file %s", infilename);
+ return -1;
+ }
+
+ FILE *outfile = fopen(outfilename, "wb");
+ if (outfile == NULL) {
+ fprintf(stderr, "Error. Cannot open output file %s", outfilename);
+ fclose(infile);
+ return -1;
+ }
+
+ if (decode) {
+ return huffman_decode(infile, outfile);
+ } else {
+ return huffman_encode(infile, outfile);
+ }
+}
projects / proxmark3-svn / blobdiff