From 2c2c46f481ea93cc8292319b13fc7ad0ea08232f Mon Sep 17 00:00:00 2001 From: bloodstalker Date: Sat, 21 Jul 2018 16:11:40 +0430 Subject: update --- test/autowasm.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 test/autowasm.c (limited to 'test') 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 +#include +#include +#include +#include + +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; +} -- cgit v1.2.3