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GELF_XLATETOF(3)		   BSD Library Functions Manual 		 GELF_XLATETOF(3)

NAME
     elf32_xlate, elf64_xlate, gelf_xlate -- translate data between files and memory

LIBRARY
     library ``libelf''

SYNOPSIS
     #include <libelf.h>

     Elf_Data *
     elf32_xlatetof(Elf_Data *dst, Elf_Data *src, unsigned int encode);

     Elf_Data *
     elf32_xlatetom(Elf_Data *dst, Elf_Data *src, unsigned int encode);

     Elf_Data *
     elf64_xlatetof(Elf_Data *dst, Elf_Data *src, unsigned int encode);

     Elf_Data *
     elf64_xlatetom(Elf_Data *dst, Elf_Data *src, unsigned int encode);

     #include <gelf.h>

     Elf_Data *
     gelf_xlatetof(Elf *elf, Elf_Data *dst, Elf_Data *src, unsigned int encode);

     Elf_Data *
     gelf_xlatetom(Elf *elf, Elf_Data *dst, Elf_Data *src, unsigned int encode);

DESCRIPTION
     These functions translate between the file and memory representations of ELF data struc-
     tures.  The in-memory representation of an ELF data structure would confirm to the byte
     ordering and data alignment restrictions dictated by the host processor.  A file representa-
     tion of the same data structure could use a non-native byte ordering and in addition may be
     laid out differently with the file.

     Functions elf32_xlatetom(), elf64_xlatetom(), and gelf_xlatetom() translate data from file
     representations to native, in-memory representations.  Functions elf32_xlatetof(),
     elf64_xlatetof(), and gelf_xlatetof() translate data from in-memory representations to file
     representations.

     Argument src denotes an Elf_Data descriptor describing the source to be translated.  The
     following elements of the descriptor need to be set before invoking these functions:

	   d_buf   Set to a valid pointer value denoting the beginning of the data area to be
		   translated.

	   d_size  Set to the total size in bytes of the source data area to be translated.

	   d_type  Set to the type of the source data being translated.  This value is one of the
		   values defined in the Elf_Type enumeration.	The Elf_Type enumeration is
		   described in elf(3).

	   d_version Set to the version number of the ELF data structures being translated.  Cur-
		   rently only version EV_CURRENT is supported.

     Argument dst describes the destination buffer.  The following elements of the Elf_Data
     descriptor need to be set before invoking these functions:

	   d_buf   Set to a valid pointer value that denotes the start of the destination buffer
		   that will hold translated data.  This value may be the same as that of the
		   source buffer, in which case an in-place conversion will be attempted.

	   d_size  Set to the size of the destination buffer in bytes.	This value will be modi-
		   fied if the function call succeeds.

	   d_version Set to the desired version number of the destination.  Currently only ver-
		   sion EV_CURRENT is supported.

     These translations routines allow the source and destination buffers to coincide, in which
     case an in-place translation will be done if the destination is large enough to hold the
     translated data.  Other kinds of overlap between the source and destination buffers are not
     permitted.

     On successful completion of the translation request the following fields of the dst descrip-
     tor would be modified:

	   d_size  Set to the size in bytes of the translated data.

	   d_type  Set to the d_type value of the source data descriptor.

     Argument encode specifies the encoding in which the file objects are represented.	It must
     be one of:

	   ELFDATANONE File objects use the library's native byte ordering.

	   ELFDATA2LSB File objects use a little-endian ordering.

	   ELFDATA2MSB File objects use a big-endian ordering.

     The functions gelf_xlatetof() and gelf_xlatetom() select the appropriate 32 or 64 bit trans-
     lations based on the class of argument elf.

RETURN VALUES
     These functions return argument dst if successful, or NULL in case of an error.

EXAMPLES
     TODO

ERRORS
     These functions may fail with the following errors:

     [ELF_E_ARGUMENT]  One of arguments src, dst or elf was NULL.

     [ELF_E_ARGUMENT]  Arguments src and dst were equal.

     [ELF_E_ARGUMENT]  The desired encoding parameter was not one of ELFDATANONE, ELFDATA2LSB or
		       ELFDATA2MSB.

     [ELF_E_ARGUMENT]  The d_type field of argument src specified an unsupported type.

     [ELF_E_DATA]      The src argument specified a buffer size that was not an integral multiple
		       of its underlying type.

     [ELF_E_DATA]      The dst argument specified a buffer size that was too small.

     [ELF_E_DATA]      Argument dst specified a destination buffer that overlaps with the source
		       buffer.

     [ELF_E_DATA]      The destination buffer for a conversion to memory had an alignment inap-
		       propriate for the underlying ELF type.

     [ELF_E_DATA]      The source buffer for a conversion to file had an alignment inappropriate
		       for the underlying ELF type.

     [ELF_E_UNIMPL]    The version numbers for arguments dst and src were not identical.

     [ELF_E_UNIMPL]    The argument src requested conversion for a type which is not currently
		       supported.

     [ELF_E_VERSION]   Argument src specified an unsupported version number.

SEE ALSO
     elf(3), elf_getdata(3), gelf(3)

BSD					  July 24, 2006 				      BSD
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