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Full Discussion: Parsing Binary
Top Forums Shell Programming and Scripting Parsing Binary Post 302170474 by xgringo on Monday 25th of February 2008 05:13:16 PM
Old 02-25-2008
Parsing Binary
I have a binary file a particular format.
It contains the Length Bytes and the Type bytes i.e the first four bytes if the file indicate the length of the Type which is to follow.

for eg, if the int value of the first four bytes is 80, then it means that the length of the following "Type" is 80. after i read the 80 bytes, the next four bytes again refer to the length of the next "Type"

I need to open the binary file, read the first four bytes, and then get the obtain the the bytes equaling the length obtained and keep doing this till the end of the file.

The problem i am having is that sometime the length of the file that it detects it wrong and that throws off the entire reading of the file

This is how i am reading the 4 bytes for length and then getting the long value

fread (Len, 1, 4, fp_bin);
long Length =(((((Len[0] << 8) + Len[1]) << 8) + Len[2]) << 8) + Len[3];
where Len is the char array containing the 4 bytes

this is how i am reading in the next 'Length' number of bytes
read(Data, 1, Length, fp_bin);
 

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LEARN ABOUT DEBIAN

glgetprogrambinary

GLGETPROGRAMBINARY(3G)						  [FIXME: manual]					    GLGETPROGRAMBINARY(3G)

NAME

       glGetProgramBinary - return a binary representation of a program object's compiled and linked executable source

C SPECIFICATION

       void glGetProgramBinary(GLuint program, GLsizei bufsize, GLsizei *length, GLenum *binaryFormat, void *binary);

PARAMETERS

       program
	   Specifies the name of a program object whose binary representation to retrieve.

       bufSize
	   Specifies the size of the buffer whose address is given by binary.

       length
	   Specifies the address of a variable to receive the number of bytes written into binary.

       binaryFormat
	   Specifies the address of a variable to receive a token indicating the format of the binary data returned by the GL.

       binary
	   Specifies the address an array into which the GL will return program's binary representation.

DESCRIPTION

       glGetProgramBinary returns a binary representation of the compiled and linked executable for program into the array of bytes whose address
       is specified in binary. The maximum number of bytes that may be written into binary is specified by bufSize. If the program binary is
       greater in size than bufSize bytes, then an error is generated, otherwise the actual number of bytes written into binary is returned in the
       variable whose address is given by length. If length is NULL, then no length is returned.

       The format of the program binary written into binary is returned in the variable whose address is given by binaryFormat, and may be
       implementation dependent. The binary produced by the GL may subsequently be returned to the GL by calling glProgramBinary(), with
       binaryFormat and length set to the values returned by glGetProgramBinary, and passing the returned binary data in the binary parameter.

ERRORS

       GL_INVALID_OPERATION is generated if bufSize is less than the size of GL_PROGRAM_BINARY_LENGTH for program.

       GL_INVALID_OPERATION is generated if GL_LINK_STATUS for the program object is false.

ASSOCIATED GETS

       glGetProgram() with argument GL_PROGRAM_BINARY_LENGTH

SEE ALSO

       glGetProgram(), glProgramBinary()

COPYRIGHT

       Copyright (C) 2010 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/.

[FIXME: source] 						    05/30/2012						    GLGETPROGRAMBINARY(3G)
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