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/* |
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* |
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* Copyright (c) 1997 |
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* Christian Michelsen Research AS |
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* Advanced Computing |
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* Fantoftvegen 38, 5036 BERGEN, Norway |
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* |
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* Permission to use, copy, modify, distribute and sell this software |
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* and its documentation for any purpose is hereby granted without fee, |
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* provided that the above copyright notice appear in all copies and |
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* that both that copyright notice and this permission notice appear |
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* in supporting documentation. Christian Michelsen Research AS makes no |
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* representations about the suitability of this software for any |
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* purpose. It is provided "as is" without express or implied warranty. |
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* |
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*/ |
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#ifndef ZSTREAM__H |
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#define ZSTREAM__H |
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/* |
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* zstream.h - C++ interface to the 'zlib' general purpose compression library |
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* $Id: zstream.h 1.1 1997-06-25 12:00:56+02 tyge Exp tyge $ |
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*/ |
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#include <strstream.h> |
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#include <string.h> |
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#include <stdio.h> |
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#include "zlib.h" |
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#if defined(_WIN32) |
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# include <fcntl.h> |
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# include <io.h> |
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# define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) |
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#else |
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# define SET_BINARY_MODE(file) |
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#endif |
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class zstringlen { |
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public: |
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zstringlen(class izstream&); |
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zstringlen(class ozstream&, const char*); |
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size_t value() const { return val.word; } |
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private: |
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struct Val { unsigned char byte; size_t word; } val; |
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}; |
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// ----------------------------- izstream ----------------------------- |
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class izstream |
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{ |
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public: |
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izstream() : m_fp(0) {} |
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izstream(FILE* fp) : m_fp(0) { open(fp); } |
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izstream(const char* name) : m_fp(0) { open(name); } |
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~izstream() { close(); } |
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/* Opens a gzip (.gz) file for reading. |
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* open() can be used to read a file which is not in gzip format; |
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* in this case read() will directly read from the file without |
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* decompression. errno can be checked to distinguish two error |
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* cases (if errno is zero, the zlib error is Z_MEM_ERROR). |
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*/ |
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void open(const char* name) { |
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if (m_fp) close(); |
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m_fp = ::gzopen(name, "rb"); |
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} |
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void open(FILE* fp) { |
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SET_BINARY_MODE(fp); |
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if (m_fp) close(); |
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m_fp = ::gzdopen(fileno(fp), "rb"); |
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} |
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/* Flushes all pending input if necessary, closes the compressed file |
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* and deallocates all the (de)compression state. The return value is |
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* the zlib error number (see function error() below). |
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*/ |
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int close() { |
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int r = ::gzclose(m_fp); |
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m_fp = 0; return r; |
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} |
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/* Binary read the given number of bytes from the compressed file. |
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*/ |
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int read(void* buf, size_t len) { |
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return ::gzread(m_fp, buf, len); |
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} |
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/* Returns the error message for the last error which occurred on the |
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* given compressed file. errnum is set to zlib error number. If an |
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* error occurred in the file system and not in the compression library, |
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* errnum is set to Z_ERRNO and the application may consult errno |
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* to get the exact error code. |
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*/ |
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const char* error(int* errnum) { |
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return ::gzerror(m_fp, errnum); |
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} |
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gzFile fp() { return m_fp; } |
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private: |
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gzFile m_fp; |
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}; |
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/* |
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* Binary read the given (array of) object(s) from the compressed file. |
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* If the input file was not in gzip format, read() copies the objects number |
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* of bytes into the buffer. |
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* returns the number of uncompressed bytes actually read |
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* (0 for end of file, -1 for error). |
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*/ |
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template <class T, class Items> |
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inline int read(izstream& zs, T* x, Items items) { |
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return ::gzread(zs.fp(), x, items*sizeof(T)); |
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} |
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/* |
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* Binary input with the '>' operator. |
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*/ |
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template <class T> |
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inline izstream& operator>(izstream& zs, T& x) { |
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::gzread(zs.fp(), &x, sizeof(T)); |
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return zs; |
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} |
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inline zstringlen::zstringlen(izstream& zs) { |
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zs > val.byte; |
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if (val.byte == 255) zs > val.word; |
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else val.word = val.byte; |
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} |
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/* |
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* Read length of string + the string with the '>' operator. |
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*/ |
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inline izstream& operator>(izstream& zs, char* x) { |
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zstringlen len(zs); |
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::gzread(zs.fp(), x, len.value()); |
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x[len.value()] = '\0'; |
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return zs; |
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} |
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inline char* read_string(izstream& zs) { |
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zstringlen len(zs); |
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char* x = new char[len.value()+1]; |
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::gzread(zs.fp(), x, len.value()); |
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x[len.value()] = '\0'; |
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return x; |
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} |
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// ----------------------------- ozstream ----------------------------- |
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class ozstream |
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{ |
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public: |
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ozstream() : m_fp(0), m_os(0) { |
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} |
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ozstream(FILE* fp, int level = Z_DEFAULT_COMPRESSION) |
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: m_fp(0), m_os(0) { |
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open(fp, level); |
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} |
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ozstream(const char* name, int level = Z_DEFAULT_COMPRESSION) |
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: m_fp(0), m_os(0) { |
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open(name, level); |
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} |
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~ozstream() { |
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close(); |
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} |
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/* Opens a gzip (.gz) file for writing. |
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* The compression level parameter should be in 0..9 |
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* errno can be checked to distinguish two error cases |
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* (if errno is zero, the zlib error is Z_MEM_ERROR). |
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*/ |
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void open(const char* name, int level = Z_DEFAULT_COMPRESSION) { |
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char mode[4] = "wb\0"; |
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if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level; |
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if (m_fp) close(); |
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m_fp = ::gzopen(name, mode); |
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} |
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/* open from a FILE pointer. |
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*/ |
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void open(FILE* fp, int level = Z_DEFAULT_COMPRESSION) { |
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SET_BINARY_MODE(fp); |
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char mode[4] = "wb\0"; |
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if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level; |
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if (m_fp) close(); |
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m_fp = ::gzdopen(fileno(fp), mode); |
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} |
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/* Flushes all pending output if necessary, closes the compressed file |
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* and deallocates all the (de)compression state. The return value is |
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* the zlib error number (see function error() below). |
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*/ |
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int close() { |
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if (m_os) { |
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::gzwrite(m_fp, m_os->str(), m_os->pcount()); |
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delete[] m_os->str(); delete m_os; m_os = 0; |
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} |
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int r = ::gzclose(m_fp); m_fp = 0; return r; |
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} |
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/* Binary write the given number of bytes into the compressed file. |
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*/ |
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int write(const void* buf, size_t len) { |
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return ::gzwrite(m_fp, (voidp) buf, len); |
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} |
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/* Flushes all pending output into the compressed file. The parameter |
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* _flush is as in the deflate() function. The return value is the zlib |
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* error number (see function gzerror below). flush() returns Z_OK if |
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* the flush_ parameter is Z_FINISH and all output could be flushed. |
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* flush() should be called only when strictly necessary because it can |
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* degrade compression. |
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*/ |
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int flush(int _flush) { |
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os_flush(); |
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return ::gzflush(m_fp, _flush); |
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} |
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/* Returns the error message for the last error which occurred on the |
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* given compressed file. errnum is set to zlib error number. If an |
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* error occurred in the file system and not in the compression library, |
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* errnum is set to Z_ERRNO and the application may consult errno |
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* to get the exact error code. |
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*/ |
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const char* error(int* errnum) { |
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return ::gzerror(m_fp, errnum); |
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} |
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gzFile fp() { return m_fp; } |
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ostream& os() { |
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if (m_os == 0) m_os = new ostrstream; |
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return *m_os; |
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} |
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void os_flush() { |
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if (m_os && m_os->pcount()>0) { |
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ostrstream* oss = new ostrstream; |
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oss->fill(m_os->fill()); |
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oss->flags(m_os->flags()); |
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oss->precision(m_os->precision()); |
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oss->width(m_os->width()); |
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::gzwrite(m_fp, m_os->str(), m_os->pcount()); |
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delete[] m_os->str(); delete m_os; m_os = oss; |
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} |
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} |
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private: |
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gzFile m_fp; |
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ostrstream* m_os; |
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}; |
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/* |
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* Binary write the given (array of) object(s) into the compressed file. |
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* returns the number of uncompressed bytes actually written |
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* (0 in case of error). |
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*/ |
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template <class T, class Items> |
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inline int write(ozstream& zs, const T* x, Items items) { |
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return ::gzwrite(zs.fp(), (voidp) x, items*sizeof(T)); |
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} |
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/* |
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* Binary output with the '<' operator. |
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*/ |
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template <class T> |
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inline ozstream& operator<(ozstream& zs, const T& x) { |
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::gzwrite(zs.fp(), (voidp) &x, sizeof(T)); |
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return zs; |
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} |
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inline zstringlen::zstringlen(ozstream& zs, const char* x) { |
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val.byte = 255; val.word = ::strlen(x); |
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if (val.word < 255) zs < (val.byte = val.word); |
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else zs < val; |
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} |
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/* |
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* Write length of string + the string with the '<' operator. |
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*/ |
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inline ozstream& operator<(ozstream& zs, const char* x) { |
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zstringlen len(zs, x); |
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::gzwrite(zs.fp(), (voidp) x, len.value()); |
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return zs; |
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} |
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#ifdef _MSC_VER |
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inline ozstream& operator<(ozstream& zs, char* const& x) { |
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return zs < (const char*) x; |
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} |
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#endif |
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/* |
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* Ascii write with the << operator; |
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*/ |
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template <class T> |
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inline ostream& operator<<(ozstream& zs, const T& x) { |
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zs.os_flush(); |
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return zs.os() << x; |
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} |
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#endif |
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