From: Mikko Rasa Date: Tue, 17 Mar 2009 11:58:07 +0000 (+0000) Subject: Add Memory class X-Git-Tag: io-1.1~1 X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=7c6c7369eb6a2e63c466e3823ea729c72d5c55d3;p=libs%2Fcore.git Add Memory class --- diff --git a/source/memory.cpp b/source/memory.cpp new file mode 100644 index 0000000..c44554a --- /dev/null +++ b/source/memory.cpp @@ -0,0 +1,134 @@ +/* $Id$ + +This file is part of libmspio +Copyright © 2009 Mikko Rasa, Mikkosoft Productions +Distributed under the LGPL +*/ + +#include +#include +#include "except.h" +#include "memory.h" + +using namespace std; + +namespace Msp { +namespace IO { + +Memory::Memory(char *d, unsigned s) +{ + init(d, d+s, M_RDWR); +} + +Memory::Memory(char *b, char *e) +{ + init(b, e, M_RDWR); +} + +Memory::Memory(const char *cd, unsigned s) +{ + char *d=const_cast(cd); + init(d, d+s, M_READ); +} + +Memory::Memory(const char *b, const char *e) +{ + init(const_cast(b), const_cast(e), M_READ); +} + +void Memory::init(char *b, char *e, Mode m) +{ + begin=b; + end=e; + pos=begin; + mode=m; +} + +unsigned Memory::put(char c) +{ + check_mode(M_WRITE); + *pos++=c; + return 1; +} + +bool Memory::getline(string &line) +{ + char *nl=find(pos, end, '\n'); + line.assign(pos, nl); + bool result=(nl!=pos); + pos=nl; + return result; +} + +int Memory::get() +{ + if(pos==end) + { + eof_flag=true; + return -1; + } + + return static_cast(*pos++); +} + +unsigned Memory::seek(int off, SeekType type) +{ + char *new_pos; + if(type==S_BEG) + new_pos=begin+off; + else if(type==S_CUR) + new_pos=pos+off; + else if(type==S_END) + new_pos=end+off; + else + throw InvalidParameterValue("Invalid seek type"); + + if(new_posend) + throw InvalidParameterValue("Invalid seek offset"); + + pos=new_pos; + return pos-begin; +} + +Handle Memory::get_event_handle() +{ + throw Exception("Memory doesn't support events"); +} + +unsigned Memory::do_write(const char *buf, unsigned size) +{ + check_mode(M_WRITE); + + size=min(size, end-pos); + memcpy(pos, buf, size); + pos+=size; + return size; +} + +unsigned Memory::do_read(char *buf, unsigned size) +{ + if(pos==end) + { + eof_flag=true; + return 0; + } + + size=min(size, end-pos); + memcpy(buf, pos, size); + pos+=size; + return size; +} + +void Memory::check_mode(Mode m) const +{ + if(m==M_WRITE) + { + if(!(mode&M_WRITE)) + throw InvalidState("Memory is not writable"); + if(pos==end) + throw InvalidState("Attempt to write past end of Memory"); + } +} + +} // namespace IO +} // namespace Msp diff --git a/source/memory.h b/source/memory.h new file mode 100644 index 0000000..7ff5316 --- /dev/null +++ b/source/memory.h @@ -0,0 +1,48 @@ +/* $Id$ + +This file is part of libmspio +Copyright © 2009 Mikko Rasa, Mikkosoft Productions +Distributed under the LGPL +*/ + +#ifndef MSP_IO_MEMORY_H_ +#define MSP_IO_MEMORY_H_ + +#include "base.h" +#include "seek.h" + +namespace Msp { +namespace IO { + +class Memory: public Base +{ +private: + char *begin; + char *end; + char *pos; + +public: + Memory(char *, unsigned); + Memory(char *, char *); + Memory(const char *, unsigned); + Memory(const char *, const char *); +private: + void init(char *, char *, Mode); + +public: + virtual unsigned put(char); + virtual bool getline(std::string &); + virtual int get(); + unsigned seek(int, SeekType); + unsigned tell() const { return pos-begin; } + virtual Handle get_event_handle(); +private: + virtual unsigned do_write(const char *, unsigned); + virtual unsigned do_read(char *, unsigned); + void check_mode(Mode) const; +}; + +} // namespace IO +} // namespace Msp + +#endif