mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-12-02 20:36:50 -05:00
459 lines
11 KiB
C++
459 lines
11 KiB
C++
// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
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#include "nvcore.h"
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#include "stream.h"
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#include "array.h"
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#include <stdio.h> // fopen
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#include <string.h> // memcpy
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namespace nv
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{
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// Portable version of fopen.
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inline FILE * fileOpen(const char * fileName, const char * mode)
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{
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nvCheck(fileName != NULL);
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#if NV_CC_MSVC && _MSC_VER >= 1400
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FILE * fp;
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if (fopen_s(&fp, fileName, mode) == 0) {
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return fp;
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}
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return NULL;
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#else
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return fopen(fileName, mode);
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#endif
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}
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/// Base stdio stream.
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class NVCORE_CLASS StdStream : public Stream
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{
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NV_FORBID_COPY(StdStream);
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public:
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/// Ctor.
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StdStream( FILE * fp, bool autoclose ) : m_fp(fp), m_autoclose(autoclose) { }
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/// Dtor.
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virtual ~StdStream()
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{
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if( m_fp != NULL && m_autoclose ) {
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#if NV_OS_WIN32
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_fclose_nolock( m_fp );
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#else
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fclose( m_fp );
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#endif
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}
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}
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/** @name Stream implementation. */
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//@{
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virtual void seek( uint pos )
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{
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nvDebugCheck(m_fp != NULL);
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nvDebugCheck(pos <= size());
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#if NV_OS_WIN32
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_fseek_nolock(m_fp, pos, SEEK_SET);
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#else
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fseek(m_fp, pos, SEEK_SET);
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#endif
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}
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virtual uint tell() const
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{
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nvDebugCheck(m_fp != NULL);
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#if NV_OS_WIN32
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return _ftell_nolock(m_fp);
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#else
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return (uint)ftell(m_fp);
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#endif
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}
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virtual uint size() const
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{
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nvDebugCheck(m_fp != NULL);
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#if NV_OS_WIN32
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uint pos = _ftell_nolock(m_fp);
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_fseek_nolock(m_fp, 0, SEEK_END);
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uint end = _ftell_nolock(m_fp);
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_fseek_nolock(m_fp, pos, SEEK_SET);
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#else
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uint pos = (uint)ftell(m_fp);
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fseek(m_fp, 0, SEEK_END);
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uint end = (uint)ftell(m_fp);
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fseek(m_fp, pos, SEEK_SET);
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#endif
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return end;
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}
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virtual bool isError() const
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{
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return m_fp == NULL || ferror( m_fp ) != 0;
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}
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virtual void clearError()
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{
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nvDebugCheck(m_fp != NULL);
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clearerr(m_fp);
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}
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// @@ The original implementation uses feof, which only returns true when we attempt to read *past* the end of the stream.
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// That is, if we read the last byte of a file, then isAtEnd would still return false, even though the stream pointer is at the file end. This is not the intent and was inconsistent with the implementation of the MemoryStream, a better
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// implementation uses use ftell and fseek to determine our location within the file.
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virtual bool isAtEnd() const
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{
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if (m_fp == NULL) return true;
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//nvDebugCheck(m_fp != NULL);
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//return feof( m_fp ) != 0;
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#if NV_OS_WIN32
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uint pos = _ftell_nolock(m_fp);
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_fseek_nolock(m_fp, 0, SEEK_END);
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uint end = _ftell_nolock(m_fp);
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_fseek_nolock(m_fp, pos, SEEK_SET);
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#else
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uint pos = (uint)ftell(m_fp);
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fseek(m_fp, 0, SEEK_END);
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uint end = (uint)ftell(m_fp);
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fseek(m_fp, pos, SEEK_SET);
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#endif
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return pos == end;
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}
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/// Always true.
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virtual bool isSeekable() const { return true; }
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//@}
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protected:
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FILE * m_fp;
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bool m_autoclose;
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};
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/// Standard output stream.
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class NVCORE_CLASS StdOutputStream : public StdStream
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{
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NV_FORBID_COPY(StdOutputStream);
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public:
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/// Construct stream by file name.
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StdOutputStream( const char * name ) : StdStream(fileOpen(name, "wb"), /*autoclose=*/true) { }
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/// Construct stream by file handle.
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StdOutputStream( FILE * fp, bool autoclose ) : StdStream(fp, autoclose)
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{
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}
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/** @name Stream implementation. */
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//@{
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/// Write data.
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virtual uint serialize( void * data, uint len )
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{
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nvDebugCheck(data != NULL);
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nvDebugCheck(m_fp != NULL);
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#if NV_OS_WIN32
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return (uint)_fwrite_nolock(data, 1, len, m_fp);
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#elif NV_OS_LINUX
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return (uint)fwrite_unlocked(data, 1, len, m_fp);
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#elif NV_OS_DARWIN
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// @@ No error checking, always returns len.
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for (uint i = 0; i < len; i++) {
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putc_unlocked(((char *)data)[i], m_fp);
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}
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return len;
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#else
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return (uint)fwrite(data, 1, len, m_fp);
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#endif
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}
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virtual bool isLoading() const
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{
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return false;
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}
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virtual bool isSaving() const
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{
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return true;
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}
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//@}
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};
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/// Standard input stream.
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class NVCORE_CLASS StdInputStream : public StdStream
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{
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NV_FORBID_COPY(StdInputStream);
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public:
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/// Construct stream by file name.
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StdInputStream( const char * name ) : StdStream(fileOpen(name, "rb"), /*autoclose=*/true) { }
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/// Construct stream by file handle.
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StdInputStream( FILE * fp, bool autoclose=true ) : StdStream(fp, autoclose)
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{
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}
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/** @name Stream implementation. */
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//@{
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/// Read data.
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virtual uint serialize( void * data, uint len )
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{
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nvDebugCheck(data != NULL);
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nvDebugCheck(m_fp != NULL);
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#if NV_OS_WIN32
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return (uint)_fread_nolock(data, 1, len, m_fp);
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#elif NV_OS_LINUX
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return (uint)fread_unlocked(data, 1, len, m_fp);
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#elif NV_OS_DARWIN
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// @@ No error checking, always returns len.
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for (uint i = 0; i < len; i++) {
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((char *)data)[i] = getc_unlocked(m_fp);
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}
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return len;
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#else
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return (uint)fread(data, 1, len, m_fp);
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#endif
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}
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virtual bool isLoading() const
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{
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return true;
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}
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virtual bool isSaving() const
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{
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return false;
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}
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//@}
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};
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/// Memory input stream.
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class NVCORE_CLASS MemoryInputStream : public Stream
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{
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NV_FORBID_COPY(MemoryInputStream);
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public:
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/// Ctor.
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MemoryInputStream( const uint8 * mem, uint size ) : m_mem(mem), m_ptr(mem), m_size(size) { }
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/** @name Stream implementation. */
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//@{
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/// Read data.
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virtual uint serialize( void * data, uint len )
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{
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nvDebugCheck(data != NULL);
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nvDebugCheck(!isError());
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uint left = m_size - tell();
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if (len > left) len = left;
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memcpy( data, m_ptr, len );
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m_ptr += len;
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return len;
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}
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virtual void seek( uint pos )
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{
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nvDebugCheck(!isError());
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m_ptr = m_mem + pos;
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nvDebugCheck(!isError());
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}
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virtual uint tell() const
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{
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nvDebugCheck(m_ptr >= m_mem);
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return uint(m_ptr - m_mem);
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}
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virtual uint size() const
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{
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return m_size;
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}
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virtual bool isError() const
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{
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return m_mem == NULL || m_ptr > m_mem + m_size || m_ptr < m_mem;
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}
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virtual void clearError()
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{
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// Nothing to do.
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}
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virtual bool isAtEnd() const
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{
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return m_ptr == m_mem + m_size;
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}
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/// Always true.
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virtual bool isSeekable() const
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{
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return true;
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}
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virtual bool isLoading() const
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{
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return true;
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}
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virtual bool isSaving() const
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{
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return false;
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}
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//@}
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const uint8 * ptr() const { return m_ptr; }
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private:
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const uint8 * m_mem;
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const uint8 * m_ptr;
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uint m_size;
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};
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/// Buffer output stream.
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class NVCORE_CLASS BufferOutputStream : public Stream
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{
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NV_FORBID_COPY(BufferOutputStream);
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public:
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BufferOutputStream(Array<uint8> & buffer) : m_buffer(buffer) { }
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virtual uint serialize( void * data, uint len )
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{
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nvDebugCheck(data != NULL);
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m_buffer.append((uint8 *)data, len);
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return len;
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}
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virtual void seek( uint /*pos*/ ) { /*Not implemented*/ }
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virtual uint tell() const { return m_buffer.size(); }
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virtual uint size() const { return m_buffer.size(); }
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virtual bool isError() const { return false; }
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virtual void clearError() {}
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virtual bool isAtEnd() const { return true; }
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virtual bool isSeekable() const { return false; }
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virtual bool isLoading() const { return false; }
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virtual bool isSaving() const { return true; }
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private:
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Array<uint8> & m_buffer;
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};
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/// Protected input stream.
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class NVCORE_CLASS ProtectedStream : public Stream
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{
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NV_FORBID_COPY(ProtectedStream);
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public:
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/// Ctor.
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ProtectedStream( Stream & s ) : m_s(&s), m_autodelete(false)
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{
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}
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/// Ctor.
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ProtectedStream( Stream * s, bool autodelete = true ) :
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m_s(s), m_autodelete(autodelete)
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{
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nvDebugCheck(m_s != NULL);
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}
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/// Dtor.
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virtual ~ProtectedStream()
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{
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if( m_autodelete ) {
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delete m_s;
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}
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}
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/** @name Stream implementation. */
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//@{
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/// Read data.
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virtual uint serialize( void * data, uint len )
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{
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nvDebugCheck(data != NULL);
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len = m_s->serialize( data, len );
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if( m_s->isError() ) {
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throw;
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}
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return len;
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}
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virtual void seek( uint pos )
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{
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m_s->seek( pos );
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if( m_s->isError() ) {
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throw;
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}
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}
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virtual uint tell() const
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{
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return m_s->tell();
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}
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virtual uint size() const
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{
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return m_s->size();
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}
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virtual bool isError() const
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{
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return m_s->isError();
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}
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virtual void clearError()
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{
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m_s->clearError();
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}
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virtual bool isAtEnd() const
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{
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return m_s->isAtEnd();
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}
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virtual bool isSeekable() const
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{
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return m_s->isSeekable();
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}
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virtual bool isLoading() const
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{
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return m_s->isLoading();
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}
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virtual bool isSaving() const
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{
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return m_s->isSaving();
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}
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//@}
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private:
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Stream * const m_s;
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bool const m_autodelete;
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};
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} // nv namespace
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//#endif // NV_CORE_STDSTREAM_H
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