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| MODULE FILE LICENSE: src/decompile/zlib zlib License |
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165 changes: 165 additions & 0 deletions
165
Ghidra/Features/Decompiler/src/decompile/cpp/compression.cc
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| /* ### | ||
| * IP: GHIDRA | ||
| * | ||
| * 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 "compression.hh" | ||
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| namespace ghidra { | ||
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| /// The compression \b level ranges from 1-9 from faster/least compression to slower/most compression. | ||
| /// Use a \b level of 0 for no compression and -1 for the \e default compression level. | ||
| /// \param level is the compression level | ||
| Compress::Compress(int4 level) | ||
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| { | ||
| compStream.zalloc = Z_NULL; | ||
| compStream.zfree = Z_NULL; | ||
| compStream.opaque = Z_NULL; | ||
| int4 ret = deflateInit(&compStream, level); | ||
| if (ret != Z_OK) | ||
| throw LowlevelError("Could not initialize deflate stream state"); | ||
| } | ||
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| Compress::~Compress(void) | ||
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| { | ||
| deflateEnd(&compStream); | ||
| } | ||
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| /// Return the number of bytes of output space still available. Output may be limited by the amount | ||
| /// of space in the output buffer or the amount of data available in the current input buffer. | ||
| /// \param buffer is where compressed bytes are stored | ||
| /// \param sz is the size, in bytes, of the buffer | ||
| /// \param finish is set to \b true if this is the final buffer to add to the stream | ||
| /// \return the number of output bytes still available | ||
| int4 Compress::deflate(uint1 *buffer,int4 sz,bool finish) | ||
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| { | ||
| int flush = finish ? Z_FINISH : Z_NO_FLUSH; | ||
| compStream.avail_out = sz; | ||
| compStream.next_out = buffer; | ||
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| int ret = ::deflate(&compStream, flush); | ||
| if (ret == Z_STREAM_ERROR) | ||
| throw LowlevelError("Error compressing stream"); | ||
| return compStream.avail_out; | ||
| } | ||
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| Decompress::Decompress(void) | ||
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| { | ||
| streamFinished = false; | ||
| compStream.zalloc = Z_NULL; | ||
| compStream.zfree = Z_NULL; | ||
| compStream.opaque = Z_NULL; | ||
| compStream.avail_in = 0; | ||
| compStream.next_in = Z_NULL; | ||
| int ret = inflateInit(&compStream); | ||
| if (ret != Z_OK) | ||
| throw LowlevelError("Could not initialize inflate stream state"); | ||
| } | ||
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| /// Return the number of bytes of output space still available. Output may be limited by the amount | ||
| /// of space in the output buffer or the amount of data available in the current input buffer. | ||
| /// \param buffer is where uncompressed bytes are stored | ||
| /// \param sz is the size, in bytes, of the buffer | ||
| /// \return the number of output bytes still available | ||
| int4 Decompress::inflate(uint1 *buffer,int4 sz) | ||
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| { | ||
| compStream.avail_out = sz; | ||
| compStream.next_out = buffer; | ||
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| int ret = ::inflate(&compStream, Z_NO_FLUSH); | ||
| switch (ret) { | ||
| case Z_NEED_DICT: | ||
| case Z_DATA_ERROR: | ||
| case Z_MEM_ERROR: | ||
| case Z_STREAM_ERROR: | ||
| throw LowlevelError("Error decompressing stream"); | ||
| case Z_STREAM_END: | ||
| streamFinished = true; | ||
| break; | ||
| default: | ||
| break; | ||
| } | ||
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| return compStream.avail_out; | ||
| } | ||
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| Decompress::~Decompress(void) | ||
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| { | ||
| inflateEnd(&compStream); | ||
| } | ||
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| const int4 CompressBuffer::IN_BUFFER_SIZE = 4096; | ||
| const int4 CompressBuffer::OUT_BUFFER_SIZE = 4096; | ||
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| /// \param s is the backing output stream | ||
| /// \param level is the level of compression | ||
| CompressBuffer::CompressBuffer(ostream &s,int4 level) | ||
| : outStream(s), compressor(level) | ||
| { | ||
| inBuffer = new uint1[IN_BUFFER_SIZE]; | ||
| outBuffer = new uint1[OUT_BUFFER_SIZE]; | ||
| setp((char *)inBuffer,(char *)inBuffer + IN_BUFFER_SIZE-1); | ||
| } | ||
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| CompressBuffer::~CompressBuffer(void) | ||
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| { | ||
| delete [] inBuffer; | ||
| delete [] outBuffer; | ||
| } | ||
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| /// The compressor is called repeatedly and its output is written to the backing stream | ||
| /// until the compressor can no longer fill the \e output buffer. | ||
| /// \param lastBuffer is \b true if this is the final set of bytes to add to the compressed stream | ||
| void CompressBuffer::flushInput(bool lastBuffer) | ||
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| { | ||
| int len = pptr() - pbase(); | ||
| compressor.input((uint1 *)pbase(),len); | ||
| int4 outAvail; | ||
| do { | ||
| outAvail = OUT_BUFFER_SIZE; | ||
| outAvail = compressor.deflate(outBuffer,outAvail,lastBuffer); | ||
| outStream.write((char *)outBuffer,OUT_BUFFER_SIZE-outAvail); | ||
| } while(outAvail == 0); | ||
| pbump(-len); | ||
| } | ||
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| /// \param c is the final character filling the buffer | ||
| /// \return the written character | ||
| int CompressBuffer::overflow(int c) | ||
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| { | ||
| if (c != EOF) { | ||
| *pptr() = c; | ||
| pbump(1); | ||
| } | ||
| flushInput(false); | ||
| return c; | ||
| } | ||
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| /// \return 0 for success | ||
| int CompressBuffer::sync(void) | ||
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| { | ||
| flushInput(true); | ||
| return 0; | ||
| } | ||
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| } |
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