#!/usr/bin/python
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'''
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Copyright 2015 Google Inc.
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Use of this source code is governed by a BSD-style license that can be
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found in the LICENSE file.
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'''
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import argparse
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def bytes_from_file(f, chunksize=8192):
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while True:
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chunk = f.read(chunksize)
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if chunk:
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for b in chunk:
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yield ord(b)
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else:
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break
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def main():
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parser = argparse.ArgumentParser(
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formatter_class=argparse.RawDescriptionHelpFormatter,
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description='Convert resource files to embedded read only data.',
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epilog='''The output (when compiled and linked) can be used as:
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struct SkEmbeddedResource {const uint8_t* data; const size_t size;};
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struct SkEmbeddedHeader {const SkEmbeddedResource* entries; const int count;};
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extern "C" SkEmbeddedHeader const NAME;''')
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parser.add_argument('--align', default=1, type=int,
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help='minimum alignment (in bytes) of resource data')
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parser.add_argument('--name', default='_resource', type=str,
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help='the name of the c identifier to export')
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parser.add_argument('--input', required=True, type=argparse.FileType('rb'),
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nargs='+', help='list of resource files to embed')
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parser.add_argument('--output', required=True, type=argparse.FileType('w'),
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help='the name of the cpp file to output')
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args = parser.parse_args()
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out = args.output.write;
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out('#include "SkTypes.h"\n')
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# Write the resources.
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index = 0
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for f in args.input:
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out('alignas({1:d}) static const uint8_t resource{0:d}[] = {{\n'
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.format(index, args.align))
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bytes_written = 0
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bytes_on_line = 0
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for b in bytes_from_file(f):
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out(hex(b) + ',')
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bytes_written += 1
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bytes_on_line += 1
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if bytes_on_line >= 32:
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out('\n')
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bytes_on_line = 0
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out('};\n')
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out('static const size_t resource{0:d}_size = {1:d};\n'
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.format(index, bytes_written))
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index += 1
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# Write the resource entries.
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out('struct SkEmbeddedResource { const uint8_t* d; const size_t s; };\n')
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out('static const SkEmbeddedResource header[] = {\n')
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index = 0
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for f in args.input:
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out(' {{ resource{0:d}, resource{0:d}_size }},\n'.format(index))
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index += 1
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out('};\n')
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out('static const int header_count = {0:d};\n'.format(index))
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# Export the resource header.
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out('struct SkEmbeddedHeader {const SkEmbeddedResource* e; const int c;};\n')
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out('extern "C" const SkEmbeddedHeader {0:s} = {{ header, header_count }};\n'
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.format(args.name))
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if __name__ == "__main__":
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main()
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