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471 lines
13 KiB
C
471 lines
13 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file test_lzip_decoder.c
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/// \brief Tests decoding lzip data
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//
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// Author: Jia Tan
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "tests.h"
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#ifdef HAVE_LZIP_DECODER
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// Memlimit large enough to pass all of the test files
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#define MEMLIMIT (1U << 20)
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#define DECODE_CHUNK_SIZE 1024
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// Avoiding using data buffers so we don't have to store the data buffers
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// as large hex strings. Instead, store the CRC32 value of the expected data.
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// CRC32 value of "Hello\nWorld\n"
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static const uint32_t hello_world_crc = 0x15A2A343;
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// CRC32 value of "Trailing garbage\n"
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static const uint32_t trailing_garbage_crc = 0x87081A60;
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// Helper function to decode a good file with no flags and plenty high memlimit
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static void
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basic_lzip_decode(const char *src, const uint32_t expected_crc) {
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size_t file_size;
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uint8_t *data = tuktest_file_from_srcdir(src, &file_size);
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uint32_t checksum = 0;
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lzma_stream strm = LZMA_STREAM_INIT;
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT, 0), LZMA_OK);
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uint8_t *output_buffer = tuktest_malloc(DECODE_CHUNK_SIZE);
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strm.next_in = data;
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strm.next_out = output_buffer;
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strm.avail_out = DECODE_CHUNK_SIZE;
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// Feed 1 byte at a time to the decoder to look for any bugs
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// when switching between decoding sequences
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lzma_ret ret = LZMA_OK;
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while (ret == LZMA_OK) {
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strm.avail_in = 1;
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ret = lzma_code(&strm, LZMA_RUN);
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if (strm.avail_out == 0) {
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checksum = lzma_crc32(output_buffer,
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strm.next_out - output_buffer,
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checksum);
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// No need to free output_buffer because it will
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// automatically be freed at the end of the test by
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// tuktest.
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output_buffer = tuktest_malloc(DECODE_CHUNK_SIZE);
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strm.next_out = output_buffer;
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strm.avail_out = DECODE_CHUNK_SIZE;
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}
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}
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assert_lzma_ret(ret, LZMA_STREAM_END);
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assert_uint_eq(strm.total_in, file_size);
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checksum = lzma_crc32(output_buffer, strm.next_out - output_buffer,
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checksum);
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assert_uint_eq(checksum, expected_crc);
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lzma_end(&strm);
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}
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static void
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test_options(void)
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{
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// Test NULL stream
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assert_lzma_ret(lzma_lzip_decoder(NULL, MEMLIMIT, 0),
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LZMA_PROG_ERROR);
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// Test invalid flags
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lzma_stream strm = LZMA_STREAM_INIT;
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT, UINT32_MAX),
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LZMA_OPTIONS_ERROR);
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// Memlimit tests are done elsewhere
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}
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static void
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test_v0_decode(void) {
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// This tests if liblzma can decode lzip version 0 files.
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// lzip 1.17 and older can decompress this, but lzip 1.18
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// and newer can no longer decode these files.
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basic_lzip_decode("files/good-1-v0.lz", hello_world_crc);
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}
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static void
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test_v1_decode(void) {
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// This tests decoding a basic lzip v1 file
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basic_lzip_decode("files/good-1-v1.lz", hello_world_crc);
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}
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// Helper function to decode a good file with trailing bytes after
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// the lzip stream
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static void
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trailing_helper(const char *src, const uint32_t expected_data_checksum,
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const uint32_t expected_trailing_checksum) {
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size_t file_size;
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uint32_t checksum = 0;
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uint8_t *data = tuktest_file_from_srcdir(src, &file_size);
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lzma_stream strm = LZMA_STREAM_INIT;
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT,
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LZMA_CONCATENATED), LZMA_OK);
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uint8_t *output_buffer = tuktest_malloc(DECODE_CHUNK_SIZE);
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strm.next_in = data;
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strm.next_out = output_buffer;
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strm.avail_in = file_size;
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strm.avail_out = DECODE_CHUNK_SIZE;
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lzma_ret ret = LZMA_OK;
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while (ret == LZMA_OK) {
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ret = lzma_code(&strm, LZMA_RUN);
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if (strm.avail_out == 0) {
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checksum = lzma_crc32(output_buffer,
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strm.next_out - output_buffer,
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checksum);
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// No need to free output_buffer because it will
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// automatically be freed at the end of the test by
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// tuktest.
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output_buffer = tuktest_malloc(DECODE_CHUNK_SIZE);
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strm.next_out = output_buffer;
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strm.avail_out = DECODE_CHUNK_SIZE;
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}
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}
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assert_lzma_ret(ret, LZMA_STREAM_END);
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assert_uint(strm.total_in, <, file_size);
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checksum = lzma_crc32(output_buffer,
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strm.next_out - output_buffer,
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checksum);
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assert_uint_eq(checksum, expected_data_checksum);
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// Trailing data should be readable from strm.next_in
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checksum = lzma_crc32(strm.next_in, strm.avail_in, 0);
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assert_uint_eq(checksum, expected_trailing_checksum);
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lzma_end(&strm);
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}
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// Helper function to decode a bad file and compare to returned error to
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// what the caller expects
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static void
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decode_expect_error(const char *src, lzma_ret expected_error)
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{
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lzma_stream strm = LZMA_STREAM_INIT;
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size_t file_size;
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uint8_t *data = tuktest_file_from_srcdir(src, &file_size);
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT,
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LZMA_CONCATENATED), LZMA_OK);
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uint8_t output_buffer[DECODE_CHUNK_SIZE];
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strm.avail_in = file_size;
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strm.next_in = data;
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strm.avail_out = DECODE_CHUNK_SIZE;
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strm.next_out = output_buffer;
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lzma_ret ret = LZMA_OK;
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while (ret == LZMA_OK) {
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// Discard output since we are only looking for errors
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strm.next_out = output_buffer;
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strm.avail_out = DECODE_CHUNK_SIZE;
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if (strm.avail_in == 0)
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ret = lzma_code(&strm, LZMA_FINISH);
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else
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ret = lzma_code(&strm, LZMA_RUN);
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}
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assert_lzma_ret(ret, expected_error);
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lzma_end(&strm);
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}
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static void
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test_v0_trailing(void) {
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trailing_helper("files/good-1-v0-trailing-1.lz", hello_world_crc,
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trailing_garbage_crc);
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}
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static void
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test_v1_trailing(void) {
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trailing_helper("files/good-1-v1-trailing-1.lz", hello_world_crc,
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trailing_garbage_crc);
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// The second files/good-1-v1-trailing-2.lz will have the same
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// expected output and trailing output as
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// files/good-1-v1-trailing-1.lz, but this tests if the prefix
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// to the trailing data contains lzip magic bytes.
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// When this happens, the expected behavior is to silently ignore
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// the magic byte prefix and consume it from the input file.
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trailing_helper("files/good-1-v1-trailing-2.lz", hello_world_crc,
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trailing_garbage_crc);
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// Expect LZMA_BUF error if a file ends with the lzip magic bytes
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// but does not contain any data after
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decode_expect_error("files/bad-1-v1-trailing-magic.lz",
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LZMA_BUF_ERROR);
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}
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static void
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test_concatentated(void)
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{
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// First test a file with one v0 member and one v1 member
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// The first member should contain "Hello\n" and
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// the second member should contain "World!\n"
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lzma_stream strm = LZMA_STREAM_INIT;
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size_t file_size;
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uint8_t *v0_v1 = tuktest_file_from_srcdir("files/good-2-v0-v1.lz",
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&file_size);
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT,
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LZMA_CONCATENATED), LZMA_OK);
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uint8_t output_buffer[DECODE_CHUNK_SIZE];
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strm.avail_in = file_size;
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strm.next_in = v0_v1;
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strm.avail_out = DECODE_CHUNK_SIZE;
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strm.next_out = output_buffer;
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assert_lzma_ret(lzma_code(&strm, LZMA_FINISH), LZMA_STREAM_END);
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assert_uint_eq(strm.total_in, file_size);
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uint32_t checksum = lzma_crc32(output_buffer, strm.total_out, 0);
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assert_uint_eq(checksum, hello_world_crc);
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// The second file contains one v1 member and one v2 member
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uint8_t *v1_v0 = tuktest_file_from_srcdir("files/good-2-v1-v0.lz",
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&file_size);
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT,
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LZMA_CONCATENATED), LZMA_OK);
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strm.avail_in = file_size;
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strm.next_in = v1_v0;
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strm.avail_out = DECODE_CHUNK_SIZE;
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strm.next_out = output_buffer;
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assert_lzma_ret(lzma_code(&strm, LZMA_FINISH), LZMA_STREAM_END);
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assert_uint_eq(strm.total_in, file_size);
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checksum = lzma_crc32(output_buffer, strm.total_out, 0);
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assert_uint_eq(checksum, hello_world_crc);
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// The third file contains 2 v1 members
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uint8_t *v1_v1 = tuktest_file_from_srcdir("files/good-2-v1-v1.lz",
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&file_size);
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT,
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LZMA_CONCATENATED), LZMA_OK);
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strm.avail_in = file_size;
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strm.next_in = v1_v1;
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strm.avail_out = DECODE_CHUNK_SIZE;
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strm.next_out = output_buffer;
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assert_lzma_ret(lzma_code(&strm, LZMA_FINISH), LZMA_STREAM_END);
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assert_uint_eq(strm.total_in, file_size);
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checksum = lzma_crc32(output_buffer, strm.total_out, 0);
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assert_uint_eq(checksum, hello_world_crc);
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lzma_end(&strm);
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}
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static void
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test_crc(void) {
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// Test invalid checksum
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lzma_stream strm = LZMA_STREAM_INIT;
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size_t file_size;
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uint8_t *data = tuktest_file_from_srcdir("files/bad-1-v1-crc32.lz",
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&file_size);
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT,
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LZMA_CONCATENATED), LZMA_OK);
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uint8_t output_buffer[DECODE_CHUNK_SIZE];
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strm.avail_in = file_size;
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strm.next_in = data;
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strm.avail_out = DECODE_CHUNK_SIZE;
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strm.next_out = output_buffer;
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assert_lzma_ret(lzma_code(&strm, LZMA_FINISH), LZMA_DATA_ERROR);
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// Test ignoring the checksum value - should decode successfully
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT,
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LZMA_CONCATENATED | LZMA_IGNORE_CHECK), LZMA_OK);
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strm.avail_in = file_size;
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strm.next_in = data;
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strm.avail_out = DECODE_CHUNK_SIZE;
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strm.next_out = output_buffer;
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assert_lzma_ret(lzma_code(&strm, LZMA_FINISH), LZMA_STREAM_END);
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assert_uint_eq(strm.total_in, file_size);
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// Test tell check
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT,
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LZMA_CONCATENATED | LZMA_TELL_ANY_CHECK), LZMA_OK);
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strm.avail_in = file_size;
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strm.next_in = data;
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strm.avail_out = DECODE_CHUNK_SIZE;
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strm.next_out = output_buffer;
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assert_lzma_ret(lzma_code(&strm, LZMA_FINISH), LZMA_GET_CHECK);
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assert_uint_eq(lzma_get_check(&strm), LZMA_CHECK_CRC32);
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assert_lzma_ret(lzma_code(&strm, LZMA_FINISH), LZMA_DATA_ERROR);
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lzma_end(&strm);
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}
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static void
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test_invalid_magic_bytes(void) {
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uint8_t lzip_id_string[] = { 0x4C, 0x5A, 0x49, 0x50 };
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lzma_stream strm = LZMA_STREAM_INIT;
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for (uint32_t i = 0; i < ARRAY_SIZE(lzip_id_string); i++) {
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// Corrupt magic bytes
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lzip_id_string[i] ^= 1;
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uint8_t output_buffer[DECODE_CHUNK_SIZE];
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assert_lzma_ret(lzma_lzip_decoder(&strm, MEMLIMIT, 0),
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LZMA_OK);
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strm.next_in = lzip_id_string;
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strm.avail_in = sizeof(lzip_id_string);
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strm.next_out = output_buffer;
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strm.avail_out = DECODE_CHUNK_SIZE;
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assert_lzma_ret(lzma_code(&strm, LZMA_RUN),
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LZMA_FORMAT_ERROR);
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// Reset magic bytes
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lzip_id_string[i] ^= 1;
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}
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lzma_end(&strm);
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}
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static void
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test_invalid_version(void)
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{
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// The file contains a version number that is not 0 or 1,
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// so it should cause an error
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decode_expect_error("files/unsupported-1-v234.lz",
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LZMA_OPTIONS_ERROR);
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}
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static void
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test_invalid_dictionary_size(void) {
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// First file has too small dictionary size field
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decode_expect_error("files/bad-1-v1-dict-1.lz", LZMA_DATA_ERROR);
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// Second file has too large dictionary size field
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decode_expect_error("files/bad-1-v1-dict-2.lz", LZMA_DATA_ERROR);
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}
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static void
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test_invalid_uncomp_size(void) {
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// Test invalid v0 lzip file uncomp size
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decode_expect_error("files/bad-1-v0-uncomp-size.lz",
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LZMA_DATA_ERROR);
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// Test invalid v1 lzip file uncomp size
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decode_expect_error("files/bad-1-v1-uncomp-size.lz",
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LZMA_DATA_ERROR);
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}
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static void
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test_invalid_member_size(void) {
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decode_expect_error("files/bad-1-v1-member-size.lz",
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LZMA_DATA_ERROR);
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}
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static void
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test_invalid_memlimit(void) {
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// A very low memlimit should prevent decoding.
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// Should be able to update the memlimit after failing
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size_t file_size;
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uint8_t *data = tuktest_file_from_srcdir("files/good-1-v1.lz",
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&file_size);
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uint8_t output_buffer[DECODE_CHUNK_SIZE];
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lzma_stream strm = LZMA_STREAM_INIT;
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assert_lzma_ret(lzma_lzip_decoder(&strm, 1, 0), LZMA_OK);
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strm.next_in = data;
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strm.avail_in = file_size;
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strm.next_out = output_buffer;
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strm.avail_out = DECODE_CHUNK_SIZE;
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assert_lzma_ret(lzma_code(&strm, LZMA_FINISH), LZMA_MEMLIMIT_ERROR);
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// Up the memlimit so decoding can continue.
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// First only increase by a small amount and expect an error
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assert_lzma_ret(lzma_memlimit_set(&strm, 100), LZMA_MEMLIMIT_ERROR);
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assert_lzma_ret(lzma_memlimit_set(&strm, MEMLIMIT), LZMA_OK);
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// Finish decoding
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assert_lzma_ret(lzma_code(&strm, LZMA_FINISH), LZMA_STREAM_END);
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assert_uint_eq(strm.total_in, file_size);
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uint32_t checksum = lzma_crc32(output_buffer, strm.total_out, 0);
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assert_uint_eq(checksum, hello_world_crc);
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lzma_end(&strm);
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}
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#endif
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extern int
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main(int argc, char **argv)
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{
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tuktest_start(argc, argv);
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#ifndef HAVE_LZIP_DECODER
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tuktest_early_skip("lzip decoder disabled");
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#else
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tuktest_run(test_options);
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tuktest_run(test_v0_decode);
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tuktest_run(test_v1_decode);
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tuktest_run(test_v0_trailing);
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tuktest_run(test_v1_trailing);
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tuktest_run(test_concatentated);
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tuktest_run(test_crc);
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tuktest_run(test_invalid_magic_bytes);
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tuktest_run(test_invalid_version);
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tuktest_run(test_invalid_dictionary_size);
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tuktest_run(test_invalid_uncomp_size);
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tuktest_run(test_invalid_member_size);
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tuktest_run(test_invalid_memlimit);
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return tuktest_end();
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#endif
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}
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