diff options
Diffstat (limited to 'lib/Support/Compressor.cpp')
| -rw-r--r-- | lib/Support/Compressor.cpp | 54 |
1 files changed, 27 insertions, 27 deletions
diff --git a/lib/Support/Compressor.cpp b/lib/Support/Compressor.cpp index 49088b8..7396d4a 100644 --- a/lib/Support/Compressor.cpp +++ b/lib/Support/Compressor.cpp @@ -1,10 +1,10 @@ //===- lib/Support/Compressor.cpp -------------------------------*- C++ -*-===// -// +// // The LLVM Compiler Infrastructure // -// This file was developed by Reid Spencer and is distributed under the +// This file was developed by Reid Spencer and is distributed under the // University of Illinois Open Source License. See LICENSE.TXT for details. -// +// //===----------------------------------------------------------------------===// // // This file implements the llvm::Compressor class, an abstraction for memory @@ -26,7 +26,7 @@ enum CompressionTypes { COMP_TYPE_BZIP2 = '2', }; -static int getdata(char*& buffer, size_t &size, +static int getdata(char*& buffer, size_t &size, llvm::Compressor::OutputDataCallback* cb, void* context) { buffer = 0; size = 0; @@ -36,7 +36,7 @@ static int getdata(char*& buffer, size_t &size, return result; } -static int getdata_uns(char*& buffer, unsigned &size, +static int getdata_uns(char*& buffer, unsigned &size, llvm::Compressor::OutputDataCallback* cb, void* context) { size_t SizeOut; int Res = getdata(buffer, SizeOut, cb, context); @@ -45,7 +45,7 @@ static int getdata_uns(char*& buffer, unsigned &size, } //===----------------------------------------------------------------------===// -//=== NULLCOMP - a compression like set of routines that just copies data +//=== NULLCOMP - a compression like set of routines that just copies data //=== without doing any compression. This is provided so that if the //=== configured environment doesn't have a compression library the //=== program can still work, albeit using more data/memory. @@ -121,26 +121,26 @@ namespace { /// This structure is only used when a bytecode file is compressed. /// As bytecode is being decompressed, the memory buffer might need -/// to be reallocated. The buffer allocation is handled in a callback +/// to be reallocated. The buffer allocation is handled in a callback /// and this structure is needed to retain information across calls /// to the callback. /// @brief An internal buffer object used for handling decompression struct BufferContext { char* buff; size_t size; - BufferContext(size_t compressedSize) { + BufferContext(size_t compressedSize) { // Null to indicate malloc of a new block - buff = 0; + buff = 0; // Compute the initial length of the uncompression buffer. Note that this // is twice the length of the compressed buffer and will be doubled again - // in the callback for an initial allocation of 4x compressedSize. This - // calculation is based on the typical compression ratio of bzip2 on LLVM - // bytecode files which typically ranges in the 50%-75% range. Since we - // typically get at least 50%, doubling is insufficient. By using a 4x + // in the callback for an initial allocation of 4x compressedSize. This + // calculation is based on the typical compression ratio of bzip2 on LLVM + // bytecode files which typically ranges in the 50%-75% range. Since we + // typically get at least 50%, doubling is insufficient. By using a 4x // multiplier on the first allocation, we minimize the impact of having to // copy the buffer on reallocation. - size = compressedSize*2; + size = compressedSize*2; } /// trimTo - Reduce the size of the buffer down to the specified amount. This @@ -154,7 +154,7 @@ struct BufferContext { /// This function handles allocation of the buffer used for decompression of /// compressed bytecode files. It is called by Compressor::decompress which is - /// called by BytecodeReader::ParseBytecode. + /// called by BytecodeReader::ParseBytecode. static size_t callback(char*&buff, size_t &sz, void* ctxt){ // Case the context variable to our BufferContext BufferContext* bc = reinterpret_cast<BufferContext*>(ctxt); @@ -168,9 +168,9 @@ struct BufferContext { // Figure out what to return to the Compressor. If this is the first call, // then bc->buff will be null. In this case we want to return the entire // buffer because there was no previous allocation. Otherwise, when the - // buffer is reallocated, we save the new base pointer in the - // BufferContext.buff field but return the address of only the extension, - // mid-way through the buffer (since its size was doubled). Furthermore, + // buffer is reallocated, we save the new base pointer in the + // BufferContext.buff field but return the address of only the extension, + // mid-way through the buffer (since its size was doubled). Furthermore, // the sz result must be 1/2 the total size of the buffer. if (bc->buff == 0 ) { buff = bc->buff = new_buff; @@ -189,18 +189,18 @@ struct BufferContext { } }; -} // end anonymous namespace +} // end anonymous namespace namespace { // This structure retains the context when compressing the bytecode file. The // WriteCompressedData function below uses it to keep track of the previously -// filled chunk of memory (which it writes) and how many bytes have been +// filled chunk of memory (which it writes) and how many bytes have been // written. struct WriterContext { // Initialize the context - WriterContext(std::ostream*OS, size_t CS) + WriterContext(std::ostream*OS, size_t CS) : chunk(0), sz(0), written(0), compSize(CS), Out(OS) {} // Make sure we clean up memory @@ -219,10 +219,10 @@ struct WriterContext { sz = 0; } - // This function is a callback used by the Compressor::compress function to + // This function is a callback used by the Compressor::compress function to // allocate memory for the compression buffer. This function fulfills that // responsibility but also writes the previous (now filled) buffer out to the - // stream. + // stream. static size_t callback(char*& buffer, size_t &size, void* context) { // Cast the context to the structure it must point to. WriterContext* ctxt = reinterpret_cast<WriterContext*>(context); @@ -259,7 +259,7 @@ struct WriterContext { } // end anonymous namespace // Compress in one of three ways -size_t Compressor::compress(const char* in, size_t size, +size_t Compressor::compress(const char* in, size_t size, OutputDataCallback* cb, void* context) { assert(in && "Can't compress null buffer"); assert(size && "Can't compress empty buffer"); @@ -355,7 +355,7 @@ size_t Compressor::compressToNewBuffer(const char* in, size_t size, char*&out) { return result; } -size_t +size_t Compressor::compressToStream(const char*in, size_t size, std::ostream& out) { // Set up the context and writer WriterContext ctxt(&out, size / 2); @@ -460,7 +460,7 @@ size_t Compressor::decompress(const char *in, size_t size, return result; } -size_t +size_t Compressor::decompressToNewBuffer(const char* in, size_t size, char*&out) { BufferContext bc(size); size_t result = decompress(in,size,BufferContext::callback,(void*)&bc); @@ -468,7 +468,7 @@ Compressor::decompressToNewBuffer(const char* in, size_t size, char*&out) { return result; } -size_t +size_t Compressor::decompressToStream(const char*in, size_t size, std::ostream& out){ // Set up the context and writer WriterContext ctxt(&out,size / 2); |