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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.
- #include <stdlib.h>
- #include <algorithm>
- #include <cstdio>
- #include "third_party/ijar/common.h"
- #include "third_party/ijar/zlib_client.h"
- #include <zlib.h>
- namespace devtools_ijar {
- u4 ComputeCrcChecksum(u1 *buf, size_t length) {
- return crc32(0, buf, length);
- }
- size_t TryDeflate(u1 *buf, size_t length) {
- u1 *outbuf = reinterpret_cast<u1 *>(malloc(length));
- z_stream stream;
- // Initialize the z_stream strcut for reading from buf and wrinting in outbuf.
- stream.zalloc = Z_NULL;
- stream.zfree = Z_NULL;
- stream.opaque = Z_NULL;
- stream.total_in = length;
- stream.avail_in = length;
- stream.total_out = length;
- stream.avail_out = length;
- stream.next_in = buf;
- stream.next_out = outbuf;
- // deflateInit2 negative windows size prevent the zlib wrapper to be used.
- if (deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -MAX_WBITS, 8,
- Z_DEFAULT_STRATEGY) != Z_OK) {
- // Failure to compress => return the buffer uncompressed
- free(outbuf);
- return length;
- }
- if (deflate(&stream, Z_FINISH) == Z_STREAM_END) {
- // Compression successful and fits in outbuf, let's copy the result in buf.
- length = stream.total_out;
- memcpy(buf, outbuf, length);
- }
- deflateEnd(&stream);
- free(outbuf);
- // Return the length of the resulting buffer
- return length;
- }
- Decompressor::Decompressor() {
- uncompressed_data_allocated_ = INITIAL_BUFFER_SIZE;
- uncompressed_data_ =
- reinterpret_cast<u1 *>(malloc(uncompressed_data_allocated_));
- }
- Decompressor::~Decompressor() { free(uncompressed_data_); }
- DecompressedFile *Decompressor::UncompressFile(const u1 *buffer,
- size_t bytes_avail) {
- z_stream stream;
- stream.zalloc = Z_NULL;
- stream.zfree = Z_NULL;
- stream.opaque = Z_NULL;
- stream.avail_in = bytes_avail;
- stream.next_in = const_cast<Bytef*>(reinterpret_cast<const Bytef*>(buffer));
- int ret = inflateInit2(&stream, -MAX_WBITS);
- if (ret != Z_OK) {
- error("inflateInit: %d\n", ret);
- return NULL;
- }
- int uncompressed_until_now = 0;
- while (true) {
- stream.avail_out = uncompressed_data_allocated_ - uncompressed_until_now;
- stream.next_out = uncompressed_data_ + uncompressed_until_now;
- int old_avail_out = stream.avail_out;
- ret = inflate(&stream, Z_SYNC_FLUSH);
- int uncompressed_now = old_avail_out - stream.avail_out;
- uncompressed_until_now += uncompressed_now;
- switch (ret) {
- case Z_STREAM_END: {
- struct DecompressedFile *decompressedFile =
- reinterpret_cast<DecompressedFile *>(
- malloc(sizeof(DecompressedFile)));
- // zlib said that there is no more data to decompress.
- u1 *new_p = reinterpret_cast<u1 *>(stream.next_in);
- decompressedFile->compressed_size = new_p - buffer;
- decompressedFile->uncompressed_size = uncompressed_until_now;
- decompressedFile->uncompressed_data = uncompressed_data_;
- inflateEnd(&stream);
- return decompressedFile;
- }
- case Z_OK: {
- // zlib said that there is no more room in the buffer allocated for
- // the decompressed data. Enlarge that buffer and try again.
- if (uncompressed_data_allocated_ == MAX_BUFFER_SIZE) {
- error(
- "ijar does not support decompressing files "
- "larger than %dMB.\n",
- static_cast<int>((MAX_BUFFER_SIZE / (1024 * 1024))));
- return NULL;
- }
- uncompressed_data_allocated_ *= 2;
- if (uncompressed_data_allocated_ > MAX_BUFFER_SIZE) {
- uncompressed_data_allocated_ = MAX_BUFFER_SIZE;
- }
- uncompressed_data_ = reinterpret_cast<u1 *>(
- realloc(uncompressed_data_, uncompressed_data_allocated_));
- break;
- }
- case Z_DATA_ERROR:
- case Z_BUF_ERROR:
- case Z_STREAM_ERROR:
- case Z_NEED_DICT:
- default: {
- error("zlib returned error code %d during inflate.\n", ret);
- return NULL;
- }
- }
- }
- }
- char *Decompressor::GetError() {
- if (errmsg[0] == 0) {
- return NULL;
- }
- return errmsg;
- }
- int Decompressor::error(const char *fmt, ...) {
- va_list ap;
- va_start(ap, fmt);
- vsnprintf(errmsg, 4 * PATH_MAX, fmt, ap);
- va_end(ap);
- return -1;
- }
- } // namespace devtools_ijar
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