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b68351fbc3
TEST=build Change-Id: Ie3be570c274b0275a995a0f54b5e6ccdfc77ccd3 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292287 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Brian Quinlan <bquinlan@google.com>
89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "bin/gzip.h"
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#include "platform/allocation.h"
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#include "platform/assert.h"
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#include "platform/globals.h"
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#include "zlib/zlib.h"
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namespace dart {
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namespace bin {
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void Decompress(const uint8_t* input,
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intptr_t input_len,
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uint8_t** output,
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intptr_t* output_length) {
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ASSERT(input != nullptr);
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ASSERT(input_len > 0);
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ASSERT(output != nullptr);
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ASSERT(output_length != nullptr);
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const intptr_t kChunkSize = 256 * 1024;
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// Initialize output.
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intptr_t output_capacity = input_len * 2;
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if (output_capacity < kChunkSize) {
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output_capacity = kChunkSize;
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}
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*output = reinterpret_cast<uint8_t*>(malloc(output_capacity));
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uint8_t* chunk_out = reinterpret_cast<uint8_t*>(malloc(kChunkSize));
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z_stream strm;
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strm.zalloc = Z_NULL;
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strm.zfree = Z_NULL;
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strm.opaque = Z_NULL;
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strm.avail_in = 0;
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strm.next_in = Z_NULL;
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int ret = inflateInit2(&strm, 32 + MAX_WBITS);
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ASSERT(ret == Z_OK);
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intptr_t input_cursor = 0;
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intptr_t output_cursor = 0;
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do {
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// Setup input.
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intptr_t size_in = input_len - input_cursor;
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if (size_in > kChunkSize) {
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size_in = kChunkSize;
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}
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strm.avail_in = size_in;
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strm.next_in = const_cast<uint8_t*>(&input[input_cursor]);
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// Inflate until we've exhausted the current input chunk.
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do {
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// Setup output.
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strm.avail_out = kChunkSize;
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strm.next_out = &chunk_out[0];
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// Inflate.
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ret = inflate(&strm, Z_SYNC_FLUSH);
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// We either hit the end of the stream or made forward progress.
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ASSERT((ret == Z_STREAM_END) || (ret == Z_OK));
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// Grow output buffer size.
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intptr_t size_out = kChunkSize - strm.avail_out;
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if (size_out > (output_capacity - output_cursor)) {
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output_capacity *= 2;
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ASSERT(size_out <= (output_capacity - output_cursor));
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*output = reinterpret_cast<uint8_t*>(realloc(*output, output_capacity));
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}
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// Copy output.
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memmove(&((*output)[output_cursor]), &chunk_out[0], size_out);
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output_cursor += size_out;
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} while (strm.avail_out == 0);
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// We've processed size_in bytes.
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input_cursor += size_in;
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// We're finished decompressing when zlib tells us.
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} while (ret != Z_STREAM_END);
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inflateEnd(&strm);
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*output_length = output_cursor;
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free(chunk_out);
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}
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} // namespace bin
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} // namespace dart
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