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#!/usr/bin/python
# -*- coding: utf-8 -*-
# Tool to embed file into objects
__author__ = __maintainer__ = "Jérôme Carretero <cJ-waf@zougloub.eu>"
__copyright__ = "Jérôme Carretero, 2014"
"""
This tool allows to embed file contents in object files (.o).
It is not exactly portable, and the file contents are reachable
using various non-portable fashions.
The goal here is to provide a functional interface to the embedding
of file data in objects.
See the ``playground/embedded_resources`` example for an example.
Usage::
bld(
name='pipeline',
# ^ Reference this in use="..." for things using the generated code
features='file_to_object',
source='some.file',
# ^ Name of the file to embed in binary section.
)
Known issues:
- Destination is named like source, with extension renamed to .o
eg. some.file -> some.o
"""
import os, sys
from waflib import Task, TaskGen, Errors
def filename_c_escape(x):
return x.replace("\\", "\\\\")
class file_to_object_s(Task.Task):
color = 'CYAN'
vars = ['DEST_CPU', 'DEST_BINFMT']
def run(self):
name = []
for i, x in enumerate(self.inputs[0].name):
if x.isalnum():
name.append(x)
else:
name.append('_')
file = self.inputs[0].abspath()
size = os.path.getsize(file)
if self.env.DEST_CPU in ('x86_64', 'ia', 'aarch64'):
unit = 'quad'
align = 8
elif self.env.DEST_CPU in ('x86','arm', 'thumb', 'm68k'):
unit = 'long'
align = 4
else:
raise Errors.WafError("Unsupported DEST_CPU, please report bug!")
file = filename_c_escape(file)
name = "_binary_" + "".join(name)
rodata = ".section .rodata"
if self.env.DEST_BINFMT == "mac-o":
name = "_" + name
rodata = ".section __TEXT,__const"
with open(self.outputs[0].abspath(), 'w') as f:
f.write(\
"""
.global %(name)s_start
.global %(name)s_end
.global %(name)s_size
%(rodata)s
%(name)s_start:
.incbin "%(file)s"
%(name)s_end:
.align %(align)d
%(name)s_size:
.%(unit)s 0x%(size)x
""" % locals())
class file_to_object_c(Task.Task):
color = 'CYAN'
def run(self):
name = []
for i, x in enumerate(self.inputs[0].name):
if x.isalnum():
name.append(x)
else:
name.append('_')
file = self.inputs[0].abspath()
size = os.path.getsize(file)
name = "_binary_" + "".join(name)
def char_to_num(ch):
if sys.version_info[0] < 3:
return ord(ch)
return ch
data = self.inputs[0].read('rb')
lines, line = [], []
for idx_byte, byte in enumerate(data):
line.append(byte)
if len(line) > 15 or idx_byte == size-1:
lines.append(", ".join(("0x%02x" % char_to_num(x)) for x in line))
line = []
data = ",\n ".join(lines)
self.outputs[0].write(\
"""
unsigned long %(name)s_size = %(size)dL;
char const %(name)s_start[] = {
%(data)s
};
char const %(name)s_end[] = {};
""" % locals())
@TaskGen.feature('file_to_object')
@TaskGen.before_method('process_source')
def tg_file_to_object(self):
bld = self.bld
sources = self.to_nodes(self.source)
targets = []
for src in sources:
if bld.env.F2O_METHOD == ["asm"]:
tgt = src.parent.find_or_declare(src.name + '.f2o.s')
tsk = self.create_task('file_to_object_s', src, tgt)
tsk.cwd = src.parent.abspath() # verify
else:
tgt = src.parent.find_or_declare(src.name + '.f2o.c')
tsk = self.create_task('file_to_object_c', src, tgt)
tsk.cwd = src.parent.abspath() # verify
targets.append(tgt)
self.source = targets
def configure(conf):
conf.load('gas')
conf.env.F2O_METHOD = ["c"]
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