libipc/src/hexdump.zig

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const std = @import("std");
pub fn hexdump(stream: anytype, header: [] const u8, buffer: [] const u8) std.os.WriteError!void {
// Print a header.
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;
// First line, first left side (simple number).
try stream.print("\n {d:0>4}: ", .{ hexb });
// Loop on all values in the buffer (i from 0 to buffer.len).
var i: u32 = 0;
while (i < buffer.len) : (i += 1) {
// Print actual hexadecimal value.
try stream.print("{X:0>2} ", .{ buffer[i] });
// What to print (simple ascii text, right side).
if (buffer[i] >= ' ' and buffer[i] <= '~') {
ascii[(i % 16)] = buffer[i];
} else {
ascii[(i % 16)] = '.';
}
// Next input is a multiple of 8 = extra space.
if ((i + 1) % 8 == 0) {
try stream.writeAll(" ");
}
// No next input: print the right amount of spaces.
if ((i + 1) == buffer.len) {
// Each line is 16 bytes to print, each byte takes 3 characters.
var missing_spaces = 3 * (15 - (i%16));
// Missing an extra space if the current index % 16 is less than 7.
if ((i%16) < 7) { missing_spaces += 1; }
while (missing_spaces > 0) : (missing_spaces -= 1) {
try stream.writeAll(" ");
}
}
// Every 16 bytes: print ascii text and line return.
// Case 1: it's been 16 bytes AND it's the last byte to print.
if ((i + 1) % 16 == 0 and (i + 1) == buffer.len) {
try stream.print("{s}\n", .{ ascii[0..ascii.len] });
}
// Case 2: it's been 16 bytes but it's not the end of the buffer.
else if ((i + 1) % 16 == 0 and (i + 1) != buffer.len) {
try stream.print("{s}\n", .{ ascii[0..ascii.len] });
hexb += 16;
try stream.print(" {d:0>4}: ", .{ hexb });
}
// Case 3: not the end of the 16 bytes row but it's the end of the buffer.
else if ((i + 1) % 16 != 0 and (i + 1) == buffer.len) {
try stream.print(" {s}\n", .{ ascii[0..((i+1) % 16)] });
}
// Case 4: not the end of the 16 bytes row and not the end of the buffer.
// Do nothing.
}
try stream.writeAll("\n");
}
const print = std.debug.print;
test "36-byte hexdump test" {
print("\nPrint hexdump, NO AUTOMATIC VERIFICATION, READ SOURCE CODE\n", .{});
var buffer = "hello this is a simple text to print";
var hexbuf: [2000]u8 = undefined;
var hexfbs = std.io.fixedBufferStream(&hexbuf);
var hexwriter = hexfbs.writer();
try hexdump(hexwriter, "Hello World", buffer);
print("{s}\n", .{hexfbs.getWritten()});
}
test "32-byte hexdump test" {
print("\nPrint hexdump, NO AUTOMATIC VERIFICATION, READ SOURCE CODE\n", .{});
var buffer = "THIS IS THE END, MY ONLY... END";
var hexbuf: [2000]u8 = undefined;
var hexfbs = std.io.fixedBufferStream(&hexbuf);
var hexwriter = hexfbs.writer();
try hexdump(hexwriter, "Hello World", buffer);
print("{s}\n", .{hexfbs.getWritten()});
}
test "26-byte hexdump test" {
print("\nPrint hexdump, NO AUTOMATIC VERIFICATION, READ SOURCE CODE\n", .{});
var buffer = "hello this is another text";
var hexbuf: [2000]u8 = undefined;
var hexfbs = std.io.fixedBufferStream(&hexbuf);
var hexwriter = hexfbs.writer();
try hexdump(hexwriter, "Hello World", buffer);
print("{s}\n", .{hexfbs.getWritten()});
}
test "1-byte hexdump test" {
print("\nPrint hexdump, NO AUTOMATIC VERIFICATION, READ SOURCE CODE\n", .{});
var buffer = "h";
var hexbuf: [2000]u8 = undefined;
var hexfbs = std.io.fixedBufferStream(&hexbuf);
var hexwriter = hexfbs.writer();
try hexdump(hexwriter, "Hello World", buffer);
print("{s}\n", .{hexfbs.getWritten()});
}
test "0-byte hexdump test" {
print("\nPrint hexdump, NO AUTOMATIC VERIFICATION, READ SOURCE CODE\n", .{});
var buffer = "";
var hexbuf: [2000]u8 = undefined;
var hexfbs = std.io.fixedBufferStream(&hexbuf);
var hexwriter = hexfbs.writer();
try hexdump(hexwriter, "Hello World", buffer);
print("{s}\n", .{hexfbs.getWritten()});
}