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-/*
- * Copyright (c) 2012, Chris Johns <chrisj@rtems.org>
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-/**
- * @file
- *
- * @ingroup rtems-ld
- *
- * @brief RTEMS Linker compression handles compressed images.
- *
- */
-
-#if !defined (_RLD_COMPRESSION_H_)
-#define _RLD_COMPRESSION_H_
-
-#include <rld-files.h>
-
-namespace rld
-{
- namespace compress
- {
- /**
- * A compressor.
- */
- class compressor
- {
- public:
- /**
- * Construct the compressor for the given image.
- *
- * @param image The image to read or write to.
- * @param size The size of the input and output buffers.
- * @param out The compressor is compressing.
- * @param compress Set to false to disable compression.
- */
- compressor (files::image& image,
- size_t size,
- bool out = true,
- bool compress = true);
-
- /**
- * Destruct the compressor.
- */
- ~compressor ();
-
- /**
- * Write the data to the output buffer and once the image buffer is full
- * compress and write the compressed data to the image.
- *
- * @param data The data to write to the image compressed
- * @param length The mount of data in bytes to write.
- */
- void write (const void* data, size_t length);
-
- /**
- * Write the section of the input image file to the output buffer and
- * once the image buffer is full compress and write the compressed data
- * to the image.
- *
- * @param input The input image.
- * @param offset The input image offset to read from.
- * @param length The mount of data in bytes to write.
- */
- void write (files::image& input, off_t offset, size_t length);
-
- /**
- * Flush the output buffer is data is present.
- */
- void flush ();
-
- /**
- * Read the compressed data into the input buffer and return the section
- * requested.
- *
- * @param data Write the decompressed data here.
- * @param length The mount of data in bytes to read.
- * @return size_t The amount of data read.
- */
- size_t read (void* data, size_t length);
-
- /**
- * Read the decompressed data writing it to the image.
- *
- * @param output_ The output image.
- * @param offset The output image offset to write from.
- * @param length The mount of data in bytes to read.
- * @return size_t The amount of data read.
- */
- size_t read (files::image& output_, off_t offset, size_t length);
-
- /**
- * Read the decompressed data writing it to the image.
- *
- * @param output_ The output image.
- * @param length The mount of data in bytes to read.
- * @return size_t The amount of data read.
- */
- size_t read (files::image& output_, size_t length);
-
- /**
- * The amount of uncompressed data transferred.
- *
- * @return size_t The amount of data tranferred.
- */
- size_t transferred () const;
-
- /**
- * The amount of compressed data transferred.
- *
- * @return size_t The amount of compressed data tranferred.
- */
- size_t compressed () const;
-
- /**
- * The current offset in the stream.
- *
- * @return off_t The current uncompressed offset.
- */
- off_t offset () const;
-
- private:
-
- /**
- * Output the block of data to the output file with the block header.
- *
- * @param forced If true output the buffer.
- */
- void output (bool forced = false);
-
- /**
- * Input a block of compressed data and decompress it.
- */
- void input ();
-
- files::image& image; //< The image to read or write to or from.
- size_t size; //< The size of the buffer.
- bool out; //< If true the it is compression.
- bool compress; //< If true compress the data.
- uint8_t* buffer; //< The decompressed buffer
- uint8_t* io; //< The I/O buffer.
- size_t level; //< The amount of data in the buffer.
- size_t total; //< The amount of uncompressed data
- // transferred.
- size_t total_compressed; //< The amount of compressed data
- // transferred.
- };
-
- /**
- * Compressor template function for writing data to the compressor.
- */
- template < typename T >
- void write (compressor& comp, const T value)
- {
- uint8_t bytes[sizeof (T)];
- T v = value;
- int b = sizeof (T) - 1;
- while (b >= 0)
- {
- bytes[b--] = (uint8_t) v;
- v >>= 8;
- }
- comp.write (bytes, sizeof (T));
- }
-
- /**
- * Compressor template function for reading data from the compressor.
- */
- template < typename T >
- T read (compressor& comp)
- {
- uint8_t bytes[sizeof (T)];
- T v = 0;
- uint32_t b = 0;
- if (comp.read (bytes, sizeof (T)) != sizeof (T))
- throw rld::error ("Reading of value failed", "compression");
- while (b < sizeof (T))
- {
- v = (v << 8) | ((T) bytes[b++]);
- }
- return v;
- }
-
- }
-}
-
-static inline rld::compress::compressor& operator<< (rld::compress::compressor& comp,
- const uint64_t value) {
- rld::compress::write < uint64_t > (comp, value);
- return comp;
-}
-
-static inline rld::compress::compressor& operator<< (rld::compress::compressor& comp,
- const uint32_t value) {
- rld::compress::write < uint32_t > (comp, value);
- return comp;
-}
-
-static inline rld::compress::compressor& operator<< (rld::compress::compressor& comp,
- const std::string& str) {
- comp.write (str.c_str (), str.size ());
- return comp;
-}
-
-static inline rld::compress::compressor& operator>> (rld::compress::compressor& comp,
- uint64_t& value) {
- value = rld::compress::read < uint64_t > (comp);
- return comp;
-}
-
-static inline rld::compress::compressor& operator>> (rld::compress::compressor& comp,
- uint32_t& value) {
- value = rld::compress::read < uint32_t > (comp);
- return comp;
-}
-
-#endif
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