static void decd_siz(ub4 *csize, ub4 *usize, ub2 *fnlen, ub2 *eflen, ub2 *flags, ub2 *method, ub1 *file_header) {
*csize = UNPACK_UB4(file_header, LOC_CSIZE);
#ifdef DEBUG
printf("Compressed size is %u\n", *csize);
#endif
*usize = UNPACK_UB4(file_header, LOC_USIZE);
#ifdef DEBUG
printf("Uncompressed size is %u\n", *usize);
#endif
*fnlen = UNPACK_UB2(file_header, LOC_FNLEN);
#ifdef DEBUG
printf("Filename length is %hu\n", *fnlen);
#endif
*eflen = UNPACK_UB2(file_header, LOC_EFLEN);
#ifdef DEBUG
printf("Extra field length is %hu\n", *eflen);
#endif
*flags = UNPACK_UB2(file_header, LOC_EXTRA);
#ifdef DEBUG
printf("Flags are %#hx\n", *flags);
#endif
*method = UNPACK_UB2(file_header, LOC_COMP);
#ifdef DEBUG
printf("Compression method is %#hx\n", *method);
#endif
}
GByteArray *JarFile::get_next_file_contents()
{
guint8 *bytes;
GByteArray *gba = g_byte_array_new();
read_signature();
//get compressed size
bytes = (guint8 *)g_malloc(sizeof(guint8) * 30);
if (!read(bytes+4, 26)) {
g_free(bytes);
return NULL;
}
guint32 compressed_size = UNPACK_UB4(bytes, LOC_CSIZE);
guint16 filename_length = UNPACK_UB2(bytes, LOC_FNLEN);
guint16 eflen = UNPACK_UB2(bytes, LOC_EFLEN);
guint16 flags = UNPACK_UB2(bytes, LOC_EXTRA);
guint16 method = UNPACK_UB2(bytes, LOC_COMP);
if (filename_length == 0) {
g_byte_array_free(gba, TRUE);
if (_last_filename != NULL)
g_free(_last_filename);
_last_filename = NULL;
g_free(bytes);
return NULL;
}
#ifdef DEBUG
std::printf("Compressed size is %u\n", compressed_size);
std::printf("Filename length is %hu\n", filename_length);
std::printf("Extra field length is %hu\n", eflen);
std::printf("Flags are %#hx\n", flags);
std::printf("Compression method is %#hx\n", method);
#endif
guint32 crc = get_crc(bytes, flags);
gchar *filename = (gchar *)read_filename(filename_length);
g_free(bytes);
if (filename == NULL)
return NULL;
if (_last_filename != NULL)
g_free(_last_filename);
_last_filename = filename;
//check if this is a directory and skip
char *c_ptr;
if ((c_ptr = std::strrchr(filename, '/')) != NULL) {
if (*(++c_ptr) == '\0') {
return NULL;
}
}
if (!check_compression_method(method, flags)) {
std::fprintf(stderr, "error in jar file\n");
return NULL;
}
if (method == 8 || flags & 0x0008) {
unsigned int file_length = 0;//uncompressed file length
lseek(fd, eflen, SEEK_CUR);
guint8 *file_data = get_compressed_file(compressed_size, file_length,
crc, flags);
if (file_data == NULL) {
g_byte_array_free(gba, FALSE);
return NULL;
}
g_byte_array_append(gba, file_data, file_length);
} else if (method == 0) {
guint8 *file_data = get_uncompressed_file(compressed_size, crc,
eflen, flags);
if (file_data == NULL) {
g_byte_array_free(gba, TRUE);
return NULL;
}
g_byte_array_append(gba, file_data, compressed_size);
} else {
lseek(fd, compressed_size+eflen, SEEK_CUR);
g_byte_array_free(gba, FALSE);
return NULL;
}
return gba;
}
