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hexdump library

master
Philippe Pittoli 2022-12-23 00:53:25 +01:00
parent 9321158a22
commit 9d1fef34a6
1 changed files with 79 additions and 0 deletions

79
zig-impl/src/hexdump.zig Normal file
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const std = @import("std");
const print = std.debug.print;
pub fn hexdump(stream: anytype, header: [] const u8, buffer: [] const u8) std.os.WriteError!void {
// pub fn hexdump(_: anytype, _: [] const u8, _: [] const u8) !void {
try stream.writeAll("\n");
if (header.len > 0) {
var hdr: [64] u8 = undefined;
var offset: usize = (hdr.len / 2) - ((header.len / 2) - 1);
std.mem.set(u8, hdr[0..hdr.len], ' ');
std.mem.copy(u8, hdr[offset..hdr.len], header);
try stream.writeAll(hdr[0..hdr.len]);
try stream.writeAll("\n");
}
var hexb: u32 = 0;
var ascii: [16] u8 = undefined;
try stream.print("\n {d:0>4}: ", .{ hexb });
var i: u32 = 0;
while (i < buffer.len) : (i += 1) {
try stream.print("{X:0>2} ", .{ buffer[i] });
if (buffer[i] >= ' ' and buffer[i] <= '~') {
ascii[(i % 16)] = buffer[i];
} else {
ascii[(i % 16)] = '.';
}
if ((i + 1) % 8 == 0 or (i + 1) == buffer.len) {
try stream.writeAll(" ");
if ((i + 1) % 16 == 0) {
hexb += 16;
if ((i + 1) != buffer.len) {
try stream.print("{s}\n {d:0>4}: ", .{ ascii[0..ascii.len], hexb });
} else {
try stream.print("{s}\n", .{ ascii[0..ascii.len] });
}
} else if ((i + 1) == buffer.len) {
var x: u32 = (i + 1) % 16;
while (x < 16) : (x += 1) {
try stream.writeAll(" ");
}
try stream.print("{s}\n", .{ ascii[0..(i % 16)] });
}
}
}
try stream.writeAll("\n");
}
// test "simple hexdump test" {
// var buffer: [5]u8 = undefined;
// buffer[0] = 1;
// buffer[1] = 2;
// buffer[2] = 4;
// buffer[3] = 8;
// buffer[4] = 16;
//
// print("\n\nLet's print the full hexdump\n\n", .{});
// var hexbuf: [2000]u8 = undefined;
// var hexfbs = std.io.fixedBufferStream(&hexbuf);
// var hexwriter = hexfbs.writer();
//
// // try hexdump(hexfbs.writer(), "this is the header", buffer);
// // try hexdump(std.io.getStdOut().writer()
// // , "Hello World", &buffer);
// try hexdump(hexwriter, "Hello World", &buffer);
//
// print("\nPRINTING\n", .{});
// print("{s}\n", .{hexfbs.getWritten()});
// }