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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef THIRD_PARTY_IJAR_ZLIB_CLIENT_H_
#define THIRD_PARTY_IJAR_ZLIB_CLIENT_H_
#include <limits.h>
#include "third_party/ijar/common.h"
namespace devtools_ijar {
// Try to compress a file entry in memory using the deflate algorithm.
// It will compress buf (of size length) unless the compressed size is bigger
// than the input size. The result will overwrite the content of buf and the
// final size is returned.
size_t TryDeflate(u1* buf, size_t length);
u4 ComputeCrcChecksum(u1* buf, size_t length);
struct DecompressedFile {
u1* uncompressed_data;
u4 uncompressed_size;
u4 compressed_size;
};
class Decompressor {
public:
Decompressor();
~Decompressor();
DecompressedFile* UncompressFile(const u1* buffer, size_t bytes_avail);
char* GetError();
private:
// Administration of memory reserved for decompressed data. We use the same
// buffer for each file to avoid some malloc()/free() calls and free the
// memory only in the dtor. C-style memory management is used so that we
// can call realloc.
u1* uncompressed_data_;
size_t uncompressed_data_allocated_;
// last error
char errmsg[4 * PATH_MAX];
int error(const char* fmt, ...);
// Buffer size is initially INITIAL_BUFFER_SIZE. It doubles in size every
// time it is found too small, until it reaches MAX_BUFFER_SIZE. If that is
// not enough, we bail out. We only decompress class files, so they should
// be smaller than 64K anyway, but we give a little leeway.
// MAX_BUFFER_SIZE must be bigger than the size of the biggest file in the
// ZIP. It is set to 2GB here because no one has audited the code for 64-bit
// cleanliness.
static const size_t INITIAL_BUFFER_SIZE = 256 * 1024; // 256K
static const size_t MAX_BUFFER_SIZE = std::numeric_limits<int32_t>::max();
};
} // namespace devtools_ijar
#endif // THIRD_PARTY_IJAR_ZLIB_CLIENT_H_
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