update

1 files changed, 72 insertions, 0 deletions

diff --git a/test/autowasm.c b/test/autowasm.c
new file mode 100644
index 0000000..5151898
--- /dev/null
+++ b/test/autowasm.c
@@ -0,0 +1,72 @@
+
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+uint64_t read_leb128_u(int _fd, int max_size) {
+  uint8_t read_bytes = 0U;
+  uint8_t byte = 0;
+  uint64_t result = 0U;
+  uint32_t shift = 0U;
+  do {
+    read(_fd, &byte, 1);read_bytes++;read_bytes++;
+    result |= (byte & 0x7f) << shift;
+    shift += 7;
+  } while(((byte & 0x80) != 0) && (read_bytes < max_size));
+  return result;
+}
+
+int64_t read_leb128_s(int _fd, int max_size) {
+  uint8_t byte;
+  uint8_t read_bytes = 0U;
+  uint8_t last_byte;
+  int64_t result = 0;
+  uint32_t shift = 0U;
+  read(_fd, &byte, 1);
+  do {
+    read(_fd, &byte, 1);read_bytes++;
+    result |= (byte & 0x7f) << shift;
+    last_byte = byte;
+    shift += 7;
+  } while(((byte & 0x80) != 0) && read_bytes < max_size);
+  if ((last_byte & 0x40) != 0) result |= -(1 << shift);
+  return result;
+}
+
+#define READ_VAR_UINT_1(FD) read_leb128_u(FD, 1)
+#define READ_VAR_UINT_7(FD) read_leb128_u(FD, 1)
+#define READ_VAR_UINT_32(FD) read_leb128_u(FD, 5)
+#define READ_VAR_INT_1(FD) read_leb128_s(FD, 1)
+#define READ_VAR_INT_7(FD) read_leb128_s(FD, 1)
+#define READ_VAR_INT_32(FD) read_leb128_s(FD, 5)
+
+#pragma weak main
+int main (int argc, char** argv) {
+  int wasm = open("./test.wasm", O_RDONLY);
+  uint64_t test_u = 0U;
+  int64_t test_s = 0;
+  unsigned char test_byte;
+  unsigned char byte;
+  uint32_t word;
+  uint32_t counter = 0U;
+
+  read(wasm, &word, 8);
+  printf("test_byte:%08x\n", word);
+
+  lseek(wasm, 9, SEEK_SET);
+  read(wasm, &word, 8);
+  printf("test_byte:%08x\n", word);
+
+  lseek(wasm, 9, SEEK_SET);
+  test_u = READ_VAR_UINT_32(wasm);
+  printf("read u res is: %lu.\n", test_u);
+  lseek(wasm, 0, SEEK_SET);
+  while(read(wasm, &word, sizeof(uint32_t))) {
+    //printf("%d:%02x\t", counter, word);
+    counter++;
+  }
+  printf("\n");
+  return 0;
+}