AnimTestbed/3rdparty/ozz-animation/extern/glfw/lib/stream.c

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2021-11-11 21:22:24 +01:00
//========================================================================
// GLFW - An OpenGL framework
// Platform: Any
// API version: 2.7
// WWW: http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
#include "internal.h"
//========================================================================
// Opens a GLFW stream with a file
//========================================================================
int _glfwOpenFileStream( _GLFWstream *stream, const char* name, const char* mode )
{
memset( stream, 0, sizeof(_GLFWstream) );
stream->file = fopen( name, mode );
if( stream->file == NULL )
{
return GL_FALSE;
}
return GL_TRUE;
}
//========================================================================
// Opens a GLFW stream with a memory block
//========================================================================
int _glfwOpenBufferStream( _GLFWstream *stream, void *data, long size )
{
memset( stream, 0, sizeof(_GLFWstream) );
stream->data = data;
stream->size = size;
return GL_TRUE;
}
//========================================================================
// Reads data from a GLFW stream
//========================================================================
long _glfwReadStream( _GLFWstream *stream, void *data, long size )
{
if( stream->file != NULL )
{
return (long) fread( data, 1, size, stream->file );
}
if( stream->data != NULL )
{
// Check for EOF
if( stream->position == stream->size )
{
return 0;
}
// Clamp read size to available data
if( stream->position + size > stream->size )
{
size = stream->size - stream->position;
}
// Perform data read
memcpy( data, (unsigned char*) stream->data + stream->position, size );
stream->position += size;
return size;
}
return 0;
}
//========================================================================
// Returns the current position of a GLFW stream
//========================================================================
long _glfwTellStream( _GLFWstream *stream )
{
if( stream->file != NULL )
{
return ftell( stream->file );
}
if( stream->data != NULL )
{
return stream->position;
}
return 0;
}
//========================================================================
// Sets the current position of a GLFW stream
//========================================================================
int _glfwSeekStream( _GLFWstream *stream, long offset, int whence )
{
long position;
if( stream->file != NULL )
{
if( fseek( stream->file, offset, whence ) != 0 )
{
return GL_FALSE;
}
return GL_TRUE;
}
if( stream->data != NULL )
{
position = offset;
// Handle whence parameter
if( whence == SEEK_CUR )
{
position += stream->position;
}
else if( whence == SEEK_END )
{
position += stream->size;
}
else if( whence != SEEK_SET )
{
return GL_FALSE;
}
// Clamp offset to buffer bounds and apply it
if( position > stream->size )
{
stream->position = stream->size;
}
else if( position < 0 )
{
stream->position = 0;
}
else
{
stream->position = position;
}
return GL_TRUE;
}
return GL_FALSE;
}
//========================================================================
// Closes a GLFW stream
//========================================================================
void _glfwCloseStream( _GLFWstream *stream )
{
if( stream->file != NULL )
{
fclose( stream->file );
}
// Nothing to be done about (user allocated) memory blocks
memset( stream, 0, sizeof(_GLFWstream) );
}