add wav, bitmap, and generic extractor

bitmapdump.c

@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct bmp_header bmp_header;
+struct bmp_header {
+  uint8_t id[2];
+  uint8_t size[4];
+  uint8_t r1[2];
+  uint8_t r2[2];
+  uint8_t offset[4];
+};
+
+int32_t little_endian(uint8_t bytes[4]) {
+  int32_t le = bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24);
+  return le;
+}
+
+int main(int argc, char **argv) {
+  if (argc != 2) {
+    fprintf(stderr, "extractor [usage]: input_file");
+    return EXIT_FAILURE;
+  }
+  bmp_header header;
+  char search;
+  int count = 0;
+  char out_name[128] = {0};
+
+  char *in = argv[1];
+  FILE *fin = fopen(in, "r");
+  fseek(fin, 0, SEEK_SET);
+  while (fread(&search, sizeof(char), 1, fin) > 0) {
+    if (search != 'B')
+      continue;
+    if (fread(&search, sizeof(char), 1, fin) <= 0)
+      continue;
+    if (search != 'M')
+      continue;
+    fpos_t pos;
+    fseek(fin, -2 * sizeof(char), SEEK_CUR);
+    fgetpos(fin, &pos);
+    fread(&header, sizeof(bmp_header), 1, fin);
+    if (header.r1[0] == 0 && header.r1[1] == 0 && header.r2[0] == 0 &&
+        header.r2[1] == 0) {
+      fseek(fin, pos, SEEK_SET);
+      int32_t size = little_endian(header.size);
+      char *data = (char *)malloc((size + 1) * sizeof(char));
+      fread(data, sizeof(char), size, fin);
+      data[size + 1] = 0;
+      snprintf(out_name, sizeof out_name, "%s_%d.bmp", in, ++count);
+      FILE *fout = fopen(out_name, "w");
+      fwrite(data, sizeof(char), size, fout);
+      fclose(fout);
+      free(data);
+    }
+  }
+
+  fclose(fin);
+  return EXIT_SUCCESS;
+}

extract.c

@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int
+main(int argc, char** argv)
+{
+	if (argc != 5)
+	{
+		fprintf(stderr, "extractor [usage]: input_file output_file size offset");
+		return EXIT_FAILURE;
+	}
+
+	char* in = argv[1];
+	char* out = argv[2];
+	int size = atoi(argv[3]);
+	int offset = atoi(argv[4]);
+	char* data = (char*)malloc(size + 1 * sizeof(char));
+	FILE* fin = fopen(in, "r");
+	fseek(fin, offset, SEEK_SET);
+	fread(data, sizeof(char), size, fin);
+	data[size + 1] = 0;
+	fclose(fin);
+	FILE* fout = fopen(out, "w");
+	fwrite(data, sizeof(char), size, fout);
+	fclose(fout);
+	free(data);
+	return EXIT_SUCCESS;
+}

wavdump.c

@@ -0,0 +1,81 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct wav_header wav_header;
+struct wav_header {
+  uint8_t id[4];
+  uint8_t size[4];
+  char wave[4];
+  char fmt[4];
+  uint8_t fmt_data_len[4];
+  uint8_t type[2];
+  uint8_t channels[2];
+  uint8_t sample_rate[4];
+  uint8_t total_rate[4];
+  uint8_t audio_type[2];
+  uint8_t bbs[2];
+  char data_str[4];
+  uint8_t data_size[4];
+};
+
+int32_t little_endian(uint8_t bytes[4]) {
+  int32_t le = bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24);
+  return le;
+}
+
+int main(int argc, char **argv) {
+  if (argc != 2) {
+    fprintf(stderr, "extractor [usage]: input_file");
+    return EXIT_FAILURE;
+  }
+  wav_header header;
+  char search;
+  int count = 0;
+  char out_name[128] = {0};
+
+  char *in = argv[1];
+  FILE *fin = fopen(in, "r");
+  fseek(fin, 0, SEEK_SET);
+  while (fread(&search, sizeof(char), 1, fin) > 0) {
+    if (search != 'R')
+      continue;
+
+    if (fread(&search, sizeof(char), 1, fin) <= 0)
+      continue;
+
+    if (search != 'I')
+      continue;
+
+    if (fread(&search, sizeof(char), 1, fin) <= 0)
+      continue;
+
+    if (search != 'F')
+      continue;
+
+    if (fread(&search, sizeof(char), 1, fin) <= 0)
+      continue;
+
+    if (search != 'F')
+      continue;
+
+    fpos_t pos;
+    fseek(fin, -4 * sizeof(char), SEEK_CUR);
+    fgetpos(fin, &pos);
+    fread(&header, sizeof(wav_header), 1, fin);
+	
+    fseek(fin, pos, SEEK_SET);
+    int32_t size = little_endian(header.data_size);
+    char *data = (char *)malloc((size + 1) * sizeof(char));
+    fread(data, sizeof(char), size, fin);
+    data[size + 1] = 0;
+    snprintf(out_name, sizeof out_name, "%s_%d.wav", in, ++count);
+    FILE *fout = fopen(out_name, "w");
+    fwrite(data, sizeof(char), size, fout);
+    fclose(fout);
+    free(data);
+  }
+
+  fclose(fin);
+  return EXIT_SUCCESS;
+}