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https://github.com/Mercury-Language/mercury.git
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db05403325
Add predicates for writing 16- and 32-bit integers to binary file streams in
native, little and big endian byte order to the standard library.
library/io.m:
Add the new predicates.
library/uint16.m:
library/uint32.m:
Add a functions for casting from the signed to unsigned versions
of these types.
runtime/mercury_int.h:
New header intended to hold things related to the implementation
of the integer types in C grades. Currently it contains the
macros defining the byte reverse operations for 16- and 32-bit
types. (It will eventually contain macros for (un)boxing 64-bit
integer types on 32-bit platforms as well.)
runtime/mercury_imp.h:
runtime/Mmakefile:
Add the new header.
tests/hard_coded/Mmakefile:
tests/write_binary_multibyte_int.{m,exp}:
Add a test for the new predicates.
101 lines
3.2 KiB
Mathematica
101 lines
3.2 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ft=mercury ts=4 sw=4 et
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%---------------------------------------------------------------------------%
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%
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% Test writing of int16, uint16, in32 and uint32 to binary file streams.
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:- module write_binary_multibyte_int.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module list.
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:- import_module string.
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main(!IO) :-
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io.make_temp_file(MakeTempResult, !IO),
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(
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MakeTempResult = ok(TempFileName),
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main_2(TempFileName, !IO)
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;
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MakeTempResult = error(Msg),
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io.print_line(Msg, !IO),
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io.set_exit_status(1, !IO)
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).
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:- pred main_2(string::in, io::di, io::uo) is det.
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main_2(FileName, !IO) :-
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io.open_binary_output(FileName, OpenOutputResult, !IO),
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(
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OpenOutputResult = ok(OutputFile),
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io.write_binary_int16_le(OutputFile, 0x0b0a_i16, !IO),
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io.write_binary_int16_be(OutputFile, 0x0b0a_i16, !IO),
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io.write_binary_uint16_le(OutputFile, 0xbbaa_u16, !IO),
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io.write_binary_uint16_be(OutputFile, 0xbbaa_u16, !IO),
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io.write_binary_int32_le(OutputFile, 0x0d0c0b0a_i32, !IO),
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io.write_binary_int32_be(OutputFile, 0x0d0c0b0a_i32, !IO),
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io.write_binary_uint32_le(OutputFile, 0xddccbbaa_u32, !IO),
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io.write_binary_uint32_be(OutputFile, 0xddccbbaa_u32, !IO),
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io.close_binary_output(OutputFile, !IO),
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io.open_binary_input(FileName, OpenInputResult, !IO),
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(
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OpenInputResult = ok(InputFile),
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read_bytes(InputFile, [], ReadResult, !IO),
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(
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ReadResult = ok(Bytes),
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io.close_binary_input(InputFile, !IO),
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io.write_list(Bytes, " ", print_byte, !IO),
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io.nl(!IO)
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;
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ReadResult = error(IO_Error),
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io.error_message(IO_Error, Msg),
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io.print_line(Msg, !IO)
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)
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;
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OpenInputResult = error(IO_Error),
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io.error_message(IO_Error, Msg),
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io.print_line(Msg, !IO)
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)
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;
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OpenOutputResult = error(IO_Error),
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io.error_message(IO_Error, Msg),
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io.print_line(Msg, !IO)
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),
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io.remove_file(FileName, _, !IO).
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:- pred print_byte(int::in, io::di, io::uo) is det.
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print_byte(Byte, !IO) :-
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io.format("0x%0.2x", [i(Byte)], !IO).
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:- pred read_bytes(io.binary_input_stream::in,
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list(int)::in, io.res(list(int))::out, io::di, io::uo) is det.
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read_bytes(InputFile, !.Bytes, Result, !IO) :-
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io.read_byte(InputFile, ReadResult, !IO),
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(
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ReadResult = ok(Byte),
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!:Bytes = [Byte | !.Bytes],
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read_bytes(InputFile, !.Bytes, Result, !IO)
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;
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ReadResult = eof,
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list.reverse(!Bytes),
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Result = ok(!.Bytes)
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;
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ReadResult = error(IO_Error),
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Result = error(IO_Error)
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).
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%---------------------------------------------------------------------------%
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:- end_module write_binary_multibyte_int.
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%---------------------------------------------------------------------------%
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