190 lines
7.5 KiB
Plaintext
190 lines
7.5 KiB
Plaintext
@c -*- mode: texinfo -*-
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@deftypefn Extension {simple_object_read *} simple_object_open_read @
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(int @var{descriptor}, off_t @var{offset}, const char *{segment_name}, @
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const char **@var{errmsg}, int *@var{err})
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Opens an object file for reading. Creates and returns an
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@code{simple_object_read} pointer which may be passed to other
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functions to extract data from the object file.
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@var{descriptor} holds a file descriptor which permits reading.
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@var{offset} is the offset into the file; this will be @code{0} in the
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normal case, but may be a different value when reading an object file
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in an archive file.
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@var{segment_name} is only used with the Mach-O file format used on
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Darwin aka Mac OS X. It is required on that platform, and means to
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only look at sections within the segment with that name. The
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parameter is ignored on other systems.
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If an error occurs, this functions returns @code{NULL} and sets
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@code{*@var{errmsg}} to an error string and sets @code{*@var{err}} to
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an errno value or @code{0} if there is no relevant errno.
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@end deftypefn
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@deftypefn Extension {const char *} simple_object_find_sections @
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(simple_object_read *@var{simple_object}, int (*@var{pfn}) (void *@var{data}, @
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const char *@var{name}, off_t @var{offset}, off_t @var{length}), @
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void *@var{data}, int *@var{err})
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This function calls @var{pfn} for each section in @var{simple_object}.
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It calls @var{pfn} with the section name, the offset within the file
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of the section contents, and the length of the section contents. The
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offset within the file is relative to the offset passed to
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@code{simple_object_open_read}. The @var{data} argument to this
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function is passed along to @var{pfn}.
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If @var{pfn} returns @code{0}, the loop over the sections stops and
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@code{simple_object_find_sections} returns. If @var{pfn} returns some
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other value, the loop continues.
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On success @code{simple_object_find_sections} returns. On error it
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returns an error string, and sets @code{*@var{err}} to an errno value
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or @code{0} if there is no relevant errno.
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@end deftypefn
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@deftypefn Extension {int} simple_object_find_section @
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(simple_object_read *@var{simple_object} off_t *@var{offset}, @
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off_t *@var{length}, const char **@var{errmsg}, int *@var{err})
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Look for the section @var{name} in @var{simple_object}. This returns
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information for the first section with that name.
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If found, return 1 and set @code{*@var{offset}} to the offset in the
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file of the section contents and set @code{*@var{length}} to the
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length of the section contents. The value in @code{*@var{offset}}
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will be relative to the offset passed to
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@code{simple_object_open_read}.
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If the section is not found, and no error occurs,
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@code{simple_object_find_section} returns @code{0} and set
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@code{*@var{errmsg}} to @code{NULL}.
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If an error occurs, @code{simple_object_find_section} returns
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@code{0}, sets @code{*@var{errmsg}} to an error message, and sets
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@code{*@var{err}} to an errno value or @code{0} if there is no
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relevant errno.
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@end deftypefn
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@deftypefn Extension {void} simple_object_release_read @
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(simple_object_read *@var{simple_object})
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Release all resources associated with @var{simple_object}. This does
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not close the file descriptor.
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@end deftypefn
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@deftypefn Extension {simple_object_attributes *} simple_object_fetch_attributes @
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(simple_object_read *@var{simple_object}, const char **@var{errmsg}, int *@var{err})
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Fetch the attributes of @var{simple_object}. The attributes are
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internal information such as the format of the object file, or the
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architecture it was compiled for. This information will persist until
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@code{simple_object_attributes_release} is called, even if
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@var{simple_object} itself is released.
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On error this returns @code{NULL}, sets @code{*@var{errmsg}} to an
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error message, and sets @code{*@var{err}} to an errno value or
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@code{0} if there is no relevant errno.
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@end deftypefn
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@deftypefn Extension {const char *} simple_object_attributes_compare @
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(simple_object_attributes *@var{attrs1}, simple_object_attributes *@var{attrs2}, @
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int *@var{err})
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Compare @var{attrs1} and @var{attrs2}. If they could be linked
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together without error, return @code{NULL}. Otherwise, return an
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error message and set @code{*@var{err}} to an errno value or @code{0}
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if there is no relevant errno.
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@end deftypefn
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@deftypefn Extension {void} simple_object_release_attributes @
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(simple_object_attributes *@var{attrs})
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Release all resources associated with @var{attrs}.
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@end deftypefn
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@deftypefn Extension {simple_object_write *} simple_object_start_write @
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(simple_object_attributes @var{attrs}, const char *@var{segment_name}, @
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const char **@var{errmsg}, int *@var{err})
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Start creating a new object file using the object file format
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described in @var{attrs}. You must fetch attribute information from
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an existing object file before you can create a new one. There is
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currently no support for creating an object file de novo.
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@var{segment_name} is only used with Mach-O as found on Darwin aka Mac
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OS X. The parameter is required on that target. It means that all
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sections are created within the named segment. It is ignored for
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other object file formats.
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On error @code{simple_object_start_write} returns @code{NULL}, sets
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@code{*@var{ERRMSG}} to an error message, and sets @code{*@var{err}}
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to an errno value or @code{0} if there is no relevant errno.
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@end deftypefn
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@deftypefn Extension {simple_object_write_section *} simple_object_write_create_section @
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(simple_object_write *@var{simple_object}, const char *@var{name}, @
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unsigned int @var{align}, const char **@var{errmsg}, int *@var{err})
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Add a section to @var{simple_object}. @var{name} is the name of the
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new section. @var{align} is the required alignment expressed as the
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number of required low-order 0 bits (e.g., 2 for alignment to a 32-bit
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boundary).
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The section is created as containing data, readable, not writable, not
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executable, not loaded at runtime. The section is not written to the
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file until @code{simple_object_write_to_file} is called.
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On error this returns @code{NULL}, sets @code{*@var{errmsg}} to an
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error message, and sets @code{*@var{err}} to an errno value or
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@code{0} if there is no relevant errno.
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@end deftypefn
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@deftypefn Extension {const char *} simple_object_write_add_data @
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(simple_object_write *@var{simple_object}, @
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simple_object_write_section *@var{section}, const void *@var{buffer}, @
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size_t @var{size}, int @var{copy}, int *@var{err})
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Add data @var{buffer}/@var{size} to @var{section} in
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@var{simple_object}. If @var{copy} is non-zero, the data will be
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copied into memory if necessary. If @var{copy} is zero, @var{buffer}
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must persist until @code{simple_object_write_to_file} is called. is
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released.
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On success this returns @code{NULL}. On error this returns an error
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message, and sets @code{*@var{err}} to an errno value or 0 if there is
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no relevant erro.
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@end deftypefn
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@deftypefn Extension {const char *} simple_object_write_to_file @
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(simple_object_write *@var{simple_object}, int @var{descriptor}, int *@var{err})
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Write the complete object file to @var{descriptor}, an open file
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descriptor. This writes out all the data accumulated by calls to
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@code{simple_object_write_create_section} and
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@var{simple_object_write_add_data}.
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This returns @code{NULL} on success. On error this returns an error
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message and sets @code{*@var{err}} to an errno value or @code{0} if
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there is no relevant errno.
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@end deftypefn
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@deftypefn Extension {void} simple_object_release_write @
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(simple_object_write *@var{simple_object})
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Release all resources associated with @var{simple_object}.
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@end deftypefn
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