static int sc_decompress_zlib_alloc(u8** out, size_t* outLen, const u8* in, size_t inLen, int gzip) {
/* Since uncompress does not offer a way to make it uncompress gzip... manually set it up */
z_stream gz;
int err;
int window_size = 15;
const int startSize = inLen < 1024 ? 2048 : inLen * 2;
const int blockSize = inLen < 1024 ? 512 : inLen / 2;
int bufferSize = startSize;
if(gzip)
window_size += 0x20;
memset(&gz, 0, sizeof(gz));
gz.next_in = (u8*)in;
gz.avail_in = inLen;
err = inflateInit2(&gz, window_size);
if(err != Z_OK) return zerr_to_opensc(err);
*outLen = 0;
while(1) {
/* Setup buffer... */
int num;
u8* buf = realloc(*out, bufferSize);
if(!buf) {
if(*out)
free(*out);
*out = NULL;
return Z_MEM_ERROR;
}
*out = buf;
gz.next_out = buf + *outLen;
gz.avail_out = bufferSize - *outLen;
err = inflate(&gz, Z_FULL_FLUSH);
if(err != Z_STREAM_END && err != Z_OK) {
if(*out)
free(*out);
*out = NULL;
break;
}
num = bufferSize - *outLen - gz.avail_out;
if(num > 0) {
*outLen += num;
bufferSize += num + blockSize;
}
if(err == Z_STREAM_END) {
buf = realloc(buf, *outLen); /* Shrink it down, if it fails, just use old data */
if(buf) {
*out = buf;
}
break;
}
}
inflateEnd(&gz);
return zerr_to_opensc(err);
}
static int sc_decompress_gzip(u8* out, size_t* outLen, const u8* in, size_t inLen) {
/* Since uncompress does not offer a way to make it uncompress gzip... manually set it up */
z_stream gz;
int err;
int window_size = 15 + 0x20;
memset(&gz, 0, sizeof(gz));
gz.next_in = (u8*)in;
gz.avail_in = inLen;
gz.next_out = out;
gz.avail_out = *outLen;
err = inflateInit2(&gz, window_size);
if(err != Z_OK) return zerr_to_opensc(err);
err = inflate(&gz, Z_FINISH);
if(err != Z_STREAM_END) {
inflateEnd(&gz);
return zerr_to_opensc(err);
}
*outLen = gz.total_out;
err = inflateEnd(&gz);
return zerr_to_opensc(err);
}
static int sc_compress_gzip(u8* out, size_t* outLen, const u8* in, size_t inLen) {
/* Since compress does not offer a way to make it compress gzip... manually set it up */
z_stream gz;
int err;
int window_size = 15 + 0x10;
memset(&gz, 0, sizeof(gz));
gz.next_in = (u8*)in;
gz.avail_in = inLen;
gz.next_out = out;
gz.avail_out = *outLen;
err = deflateInit2(&gz, Z_BEST_COMPRESSION, Z_DEFLATED, window_size, 9, Z_DEFAULT_STRATEGY);
if(err != Z_OK) return zerr_to_opensc(err);
err = deflate(&gz, Z_FINISH);
if(err != Z_STREAM_END) {
deflateEnd(&gz);
return zerr_to_opensc(err);
}
*outLen = gz.total_out;
err = deflateEnd(&gz);
return zerr_to_opensc(err);
}
int sc_compress(u8* out, size_t* outLen, const u8* in, size_t inLen, int method) {
unsigned long zlib_outlen;
int rc;
switch(method) {
case COMPRESSION_ZLIB:
zlib_outlen = *outLen;
rc = zerr_to_opensc(compress(out, &zlib_outlen, in, inLen));
*outLen = zlib_outlen;
return rc;
case COMPRESSION_GZIP:
return sc_compress_gzip(out, outLen, in, inLen);
default:
return SC_ERROR_INVALID_ARGUMENTS;
}
}
int sc_decompress(u8* out, size_t* outLen, const u8* in, size_t inLen, int method) {
unsigned long zlib_outlen;
int rc;
if(method == COMPRESSION_AUTO) {
method = detect_method(in, inLen);
if(method == COMPRESSION_UNKNOWN) {
return SC_ERROR_UNKNOWN_DATA_RECEIVED;
}
}
switch(method) {
case COMPRESSION_ZLIB:
zlib_outlen = *outLen;
rc = zerr_to_opensc(uncompress(out, &zlib_outlen, in, inLen));
*outLen = zlib_outlen;
return rc;
case COMPRESSION_GZIP:
return sc_decompress_gzip(out, outLen, in, inLen);
default:
return SC_ERROR_INVALID_ARGUMENTS;
}
}
