Updated documentation

pull/154/head
Jeffrey Walton 2016-04-05 22:12:56 -04:00
parent 2f34169149
commit 8c5bc0e532
2 changed files with 80 additions and 13 deletions

33
gzip.h
View File

@ -1,3 +1,8 @@
// gzip.h - written and placed in the public domain by Wei Dai
//! \file gzip.h
//! \brief GZIP compression and decompression (RFC 1952)
#ifndef CRYPTOPP_GZIP_H
#define CRYPTOPP_GZIP_H
@ -8,12 +13,25 @@
NAMESPACE_BEGIN(CryptoPP)
/// GZIP Compression (RFC 1952)
//! \class Gzip
//! \brief GZIP Compression (RFC 1952)
class Gzip : public Deflator
{
public:
//! \brief Construct a Gzip compressor
//! \param attachment an attached transformation
//! \param deflateLevel the deflate level
//! \param log2WindowSize the window size
//! \param detectUncompressible flag to detect if data is compressible
//! \details detectUncompressible makes it faster to process uncompressible files, but
//! if a file has both compressible and uncompressible parts, it may fail to compress
//! some of the compressible parts.
Gzip(BufferedTransformation *attachment=NULL, unsigned int deflateLevel=DEFAULT_DEFLATE_LEVEL, unsigned int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true)
: Deflator(attachment, deflateLevel, log2WindowSize, detectUncompressible), m_totalLen(0) {}
//! \brief Construct a Gzip compressor
//! \param parameters a set of NameValuePairs to initialize this object
//! \param attachment an attached transformation
//! \details Possible parameter names: Log2WindowSize, DeflateLevel, DetectUncompressible
Gzip(const NameValuePairs &parameters, BufferedTransformation *attachment=NULL)
: Deflator(parameters, attachment), m_totalLen(0) {}
@ -35,13 +53,22 @@ class Gunzip : public Inflator
{
public:
typedef Inflator::Err Err;
//! \class HeaderErr
//! \brief Exception thrown when a header decoding error occurs
class HeaderErr : public Err {public: HeaderErr() : Err(INVALID_DATA_FORMAT, "Gunzip: header decoding error") {}};
//! \class TailErr
//! \brief Exception thrown when the tail is too short
class TailErr : public Err {public: TailErr() : Err(INVALID_DATA_FORMAT, "Gunzip: tail too short") {}};
//! \class CrcErr
//! \brief Exception thrown when a CRC error occurs
class CrcErr : public Err {public: CrcErr() : Err(DATA_INTEGRITY_CHECK_FAILED, "Gunzip: CRC check error") {}};
//! \class LengthErr
//! \brief Exception thrown when a length error occurs
class LengthErr : public Err {public: LengthErr() : Err(DATA_INTEGRITY_CHECK_FAILED, "Gunzip: length check error") {}};
//! \brief Construct a Gunzip
//! \param attachment a \ BufferedTransformation to attach to this object
//! \brief Construct a Gunzip decompressor
//! \param attachment an attached transformation
//! \param repeat decompress multiple compressed streams in series
//! \param autoSignalPropagation 0 to turn off MessageEnd signal
Gunzip(BufferedTransformation *attachment = NULL, bool repeat = false, int autoSignalPropagation = -1);

View File

@ -1,3 +1,8 @@
// zdeflate.h - written and placed in the public domain by Wei Dai
//! \file zdeflate.h
//! \brief DEFLATE compression and decompression (RFC 1951)
#ifndef CRYPTOPP_ZDEFLATE_H
#define CRYPTOPP_ZDEFLATE_H
@ -7,11 +12,14 @@
NAMESPACE_BEGIN(CryptoPP)
//! _
//! \brief Encoding table writer
class LowFirstBitWriter : public Filter
{
public:
//! \brief Construct a LowFirstBitWriter
//! \param attachment an attached transformation
LowFirstBitWriter(BufferedTransformation *attachment);
void PutBits(unsigned long value, unsigned int length);
void FlushBitBuffer();
void ClearBitBuffer();
@ -60,23 +68,55 @@ public:
SecBlock<Code> m_valueToCode;
};
//! DEFLATE (RFC 1951) compressor
//! \class Deflator
//! \brief DEFLATE compressor (RFC 1951)
class Deflator : public LowFirstBitWriter
{
public:
enum {MIN_DEFLATE_LEVEL = 0, DEFAULT_DEFLATE_LEVEL = 6, MAX_DEFLATE_LEVEL = 9};
enum {MIN_LOG2_WINDOW_SIZE = 9, DEFAULT_LOG2_WINDOW_SIZE = 15, MAX_LOG2_WINDOW_SIZE = 15};
/*! \note detectUncompressible makes it faster to process uncompressible files, but
if a file has both compressible and uncompressible parts, it may fail to compress some of the
compressible parts. */
//! \brief Deflate level as enumerated values.
enum {
//! \brief Minimum deflation level, fastest speed (0)
MIN_DEFLATE_LEVEL = 0,
//! \brief Default deflation level, compromise between speed (6)
DEFAULT_DEFLATE_LEVEL = 6,
//! \brief Minimum deflation level, slowest speed (9)
MAX_DEFLATE_LEVEL = 9};
//! \brief Windows size as enumerated values.
enum {
//! \brief Minimum window size, smallest table (9)
MIN_LOG2_WINDOW_SIZE = 9,
//! \brief Default window size (15)
DEFAULT_LOG2_WINDOW_SIZE = 15,
//! \brief Maximum window size, largest table (15)
MAX_LOG2_WINDOW_SIZE = 15};
//! \brief Construct a Deflator compressor
//! \param attachment an attached transformation
//! \param deflateLevel the deflate level
//! \param log2WindowSize the window size
//! \param detectUncompressible flag to detect if data is compressible
//! \details detectUncompressible makes it faster to process uncompressible files, but
//! if a file has both compressible and uncompressible parts, it may fail to compress
//! some of the compressible parts.
Deflator(BufferedTransformation *attachment=NULL, int deflateLevel=DEFAULT_DEFLATE_LEVEL, int log2WindowSize=DEFAULT_LOG2_WINDOW_SIZE, bool detectUncompressible=true);
//! possible parameter names: Log2WindowSize, DeflateLevel, DetectUncompressible
//! \brief Construct a Deflator compressor
//! \param parameters a set of NameValuePairs to initialize this object
//! \param attachment an attached transformation
//! \details Possible parameter names: Log2WindowSize, DeflateLevel, DetectUncompressible
Deflator(const NameValuePairs &parameters, BufferedTransformation *attachment=NULL);
//! this function can be used to set the deflate level in the middle of compression
//! \brief Sets the deflation level
//! \param deflateLevel the level of deflation
//! \details SetDeflateLevel can be used to set the deflate level in the middle of compression
void SetDeflateLevel(int deflateLevel);
//! \brief Retrieves the deflation level
//! \returns the level of deflation
int GetDeflateLevel() const {return m_deflateLevel;}
//! \brief Retrieves the window size
//! \returns the windows size
int GetLog2WindowSize() const {return m_log2WindowSize;}
void IsolatedInitialize(const NameValuePairs &parameters);