Extract part of an archive to a different file


 
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Old 09-10-2015
You don't need random access for your output file. You'll just be doing sequential writes to your output file. You'll also just doing sequential reads from your input file (once you seek to the proper starting position).
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GLINVALIDATEBUFFERSU(3G)					   OpenGL Manual					  GLINVALIDATEBUFFERSU(3G)

NAME
glInvalidateBufferSubData - invalidate a region of a buffer object's data store C SPECIFICATION
void glInvalidateBufferSubData(GLuint buffer, GLintptr offset, GLsizeiptr length); PARAMETERS
buffer The name of a buffer object, a subrange of whose data store to invalidate. offset The offset within the buffer's data store of the start of the range to be invalidated. length The length of the range within the buffer's data store to be invalidated. DESCRIPTION
glInvalidateBufferSubData invalidates all or part of the content of the data store of a buffer object. After invalidation, the content of the specified range of the buffer's data store becomes undefined. The start of the range is given by offset and its size is given by length, both measured in basic machine units. ERRORS
GL_INVALID_VALUE is generated if offset or length is negative, or if offset + length is greater than the value of GL_BUFFER_SIZE for buffer. GL_INVALID_VALUE is generated if buffer is not the name of an existing buffer object. GL_INVALID_OPERATION is generated if any part of buffer is currently mapped. ASSOCIATED GETS
glGetBufferParameter() with argument GL_BUFFER_SIZE SEE ALSO
glInvalidateTexSubImage(),, glInvalidateTexImage(), glInvalidateBufferData(), glInvalidateFramebuffer(), glInvalidateSubFramebuffer(). COPYRIGHT
Copyright (C) 2012 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/. AUTHORS
opengl.org opengl.org 06/10/2014 GLINVALIDATEBUFFERSU(3G)