Libhexa: first commit.
commit
84024fb05a
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zig-out
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.zig-cache
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const std = @import("std");
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const VERSION = "0.1.0";
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// Although this function looks imperative, note that its job is to
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// declaratively construct a build graph that will be executed by an external
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// runner.
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pub fn build(b: *std.Build) void {
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// Standard target options allows the person running `zig build` to choose
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// what target to build for. Here we do not override the defaults, which
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// means any target is allowed, and the default is native. Other options
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// for restricting supported target set are available.
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const target = b.standardTargetOptions(.{});
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// Standard optimization options allow the person running `zig build` to select
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// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
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// set a preferred release mode, allowing the user to decide how to optimize.
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const optimize = b.standardOptimizeOption(.{});
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const static_lib = b.addStaticLibrary(.{
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.name = "hexa",
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// In this case the main source file is merely a path, however, in more
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// complicated build scripts, this could be a generated file.
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.root_source_file = b.path("src/bindings.zig"),
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.target = target,
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.optimize = optimize,
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});
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// This declares intent for the library to be installed into the standard
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// location when the user invokes the "install" step (the default step when
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// running `zig build`).
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b.installArtifact(static_lib);
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const shared_lib = b.addSharedLibrary(.{
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.name = "hexa",
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.root_source_file = .{ .cwd_relative = "src/bindings.zig" },
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.version = comptime (try std.SemanticVersion.parse(VERSION)),
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.target = target,
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.optimize = optimize,
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});
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shared_lib.linkLibC();
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b.installArtifact(shared_lib);
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const exe = b.addExecutable(.{
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.name = "hexa",
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.root_source_file = b.path("src/application.zig"),
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.target = target,
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.optimize = optimize,
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});
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// This declares intent for the executable to be installed into the
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// standard location when the user invokes the "install" step (the default
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// step when running `zig build`).
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b.installArtifact(exe);
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// This *creates* a Run step in the build graph, to be executed when another
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// step is evaluated that depends on it. The next line below will establish
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// such a dependency.
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const run_cmd = b.addRunArtifact(exe);
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// By making the run step depend on the install step, it will be run from the
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// installation directory rather than directly from within the cache directory.
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// This is not necessary, however, if the application depends on other installed
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// files, this ensures they will be present and in the expected location.
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run_cmd.step.dependOn(b.getInstallStep());
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// This allows the user to pass arguments to the application in the build
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// command itself, like this: `zig build run -- arg1 arg2 etc`
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if (b.args) |args| {
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run_cmd.addArgs(args);
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}
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// This creates a build step. It will be visible in the `zig build --help` menu,
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// and can be selected like this: `zig build run`
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// This will evaluate the `run` step rather than the default, which is "install".
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const run_step = b.step("run", "Run the app");
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run_step.dependOn(&run_cmd.step);
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// Creates a step for unit testing. This only builds the test executable
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// but does not run it.
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const lib_unit_tests = b.addTest(.{
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.root_source_file = b.path("src/root.zig"),
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.target = target,
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.optimize = optimize,
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});
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const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
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const exe_unit_tests = b.addTest(.{
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.root_source_file = b.path("src/main.zig"),
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.target = target,
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.optimize = optimize,
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});
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const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
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// Similar to creating the run step earlier, this exposes a `test` step to
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// the `zig build --help` menu, providing a way for the user to request
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// running the unit tests.
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const test_step = b.step("test", "Run unit tests");
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test_step.dependOn(&run_lib_unit_tests.step);
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test_step.dependOn(&run_exe_unit_tests.step);
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const install_static_lib = b.addInstallArtifact(static_lib, .{});
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const static_lib_step = b.step("static", "Compile LibIPC as a static library.");
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static_lib_step.dependOn(&install_static_lib.step);
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const install_shared_lib = b.addInstallArtifact(shared_lib, .{});
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// b.getInstallStep().dependOn(&install_shared_lib.step);
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const shared_lib_step = b.step("shared", "Compile LibIPC as a shared library.");
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shared_lib_step.dependOn(&install_shared_lib.step);
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}
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.{
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// This is the default name used by packages depending on this one. For
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// example, when a user runs `zig fetch --save <url>`, this field is used
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// as the key in the `dependencies` table. Although the user can choose a
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// different name, most users will stick with this provided value.
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//
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// It is redundant to include "zig" in this name because it is already
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// within the Zig package namespace.
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.name = "libhexa",
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// This is a [Semantic Version](https://semver.org/).
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// In a future version of Zig it will be used for package deduplication.
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.version = "0.0.0",
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// This field is optional.
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// This is currently advisory only; Zig does not yet do anything
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// with this value.
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//.minimum_zig_version = "0.11.0",
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// This field is optional.
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// Each dependency must either provide a `url` and `hash`, or a `path`.
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// `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
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// Once all dependencies are fetched, `zig build` no longer requires
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// internet connectivity.
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.dependencies = .{
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// See `zig fetch --save <url>` for a command-line interface for adding dependencies.
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//.example = .{
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// // When updating this field to a new URL, be sure to delete the corresponding
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// // `hash`, otherwise you are communicating that you expect to find the old hash at
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// // the new URL.
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// .url = "https://example.com/foo.tar.gz",
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//
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// // This is computed from the file contents of the directory of files that is
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// // obtained after fetching `url` and applying the inclusion rules given by
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// // `paths`.
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// //
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// // This field is the source of truth; packages do not come from a `url`; they
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// // come from a `hash`. `url` is just one of many possible mirrors for how to
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// // obtain a package matching this `hash`.
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// //
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// // Uses the [multihash](https://multiformats.io/multihash/) format.
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// .hash = "...",
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//
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// // When this is provided, the package is found in a directory relative to the
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// // build root. In this case the package's hash is irrelevant and therefore not
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// // computed. This field and `url` are mutually exclusive.
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// .path = "foo",
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// // When this is set to `true`, a package is declared to be lazily
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// // fetched. This makes the dependency only get fetched if it is
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// // actually used.
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// .lazy = false,
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//},
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},
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// Specifies the set of files and directories that are included in this package.
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// Only files and directories listed here are included in the `hash` that
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// is computed for this package. Only files listed here will remain on disk
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// when using the zig package manager. As a rule of thumb, one should list
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// files required for compilation plus any license(s).
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// Paths are relative to the build root. Use the empty string (`""`) to refer to
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// the build root itself.
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// A directory listed here means that all files within, recursively, are included.
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.paths = .{
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"build.zig",
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"build.zig.zon",
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"src",
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// For example...
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//"LICENSE",
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//"README.md",
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},
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}
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#include "../libhexa.h"
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#include <stdio.h>
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#include <string.h>
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#define BUFFER_SIZE 2000
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int main(void)
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{
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char buffer[BUFFER_SIZE];
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char inp[] = "hello this is me, how are you?";
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char title[] = "this is my title";
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uint32_t bufsize = BUFFER_SIZE;
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uint32_t *bufsizep = &bufsize;
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const int ret = hexdump(title, strlen(title), inp, strlen(inp), buffer, bufsizep);
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if(ret != 0) {
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printf("something bad happened\n");
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return 1;
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}
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printf("%.*s", bufsize, buffer);
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return 0;
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}
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#ifndef __LIBHEXA__
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#define __LIBHEXA__
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#include <stdint.h>
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// Write an hexadecimal dump of input data in the output buffer.
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// A title can be given to the dump, center-aligned on the first line.
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// In case the title is empty, this line won't be written at all.
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int32_t hexdump(char* title, uint32_t title_len
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, char* input_buffer, uint32_t input_buffer_len
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, char* output_buffer, unsigned int* output_buffer_len);
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#endif
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all: build
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build:
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zig build
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build-test: build
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gcc -o example c-example/example.c -L ./zig-out/lib/ -lhexa
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run-test: build
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LD_LIBRARY_PATH=./zig-out/lib/ ./example
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const std = @import("std");
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const hexa = @import("./libhexa.zig");
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const stdin = std.io.getStdIn().reader();
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const stdout = std.io.getStdOut().writer();
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const line_size = 16;
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const nlines = 32;
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/// Print some bytes' hexdump on standard output.
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pub fn print_hex(title: []const u8, buffer : []const u8) !void
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{
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var hexbuf: [line_size*nlines*10]u8 = undefined;
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var hexfbs = std.io.fixedBufferStream(&hexbuf);
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const hexwriter = hexfbs.writer();
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try hexa.hexdump(hexwriter, title, buffer);
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try stdout.print("{s}", .{hexfbs.getWritten()});
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}
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/// The program is simple: print an hexadecimal dump of input.
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/// Provided parameter will be shown as a title.
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pub fn main() !void
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{
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var title : []const u8 = "";
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const args = try std.process.argsAlloc(std.heap.page_allocator);
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if (args.len > 2) {
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try stdout.print("usage: {s} [title]\n", .{args[0]});
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try stdout.print("example: {s} 'debug hexdump of blah'\n", .{args[0]});
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return;
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}
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if (args.len == 2) { title = args[1]; }
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var input_buffer: [line_size*nlines]u8 = undefined;
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var n : u64 = undefined;
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n = try stdin.read(&input_buffer);
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while(n > 0)
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{
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try print_hex(title, input_buffer[0..n]);
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n = try stdin.read(&input_buffer);
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}
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}
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const std = @import("std");
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const hexa = @import("./libhexa.zig");
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const log = std.log.scoped(.libhexa);
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const stdout = std.io.getStdOut().writer();
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/// Write an hexdump of input data in an output buffer.
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export fn hexdump(title: [*]const u8, title_len: u32,
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input_buffer: [*]const u8, input_buffer_len: u32,
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output_buffer: [*]u8, output_buffer_len: *u32) callconv(.C) i32
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{
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var hexfbs = std.io.fixedBufferStream(output_buffer[0..output_buffer_len.*]);
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const writer_output = hexfbs.writer();
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hexa.hexdump(writer_output, title[0..title_len], input_buffer[0..input_buffer_len]) catch |err| {
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switch(err) {
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error.DiskQuota => log.warn("error.DiskQuota", .{}),
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error.FileTooBig => log.warn("error.FileTooBig", .{}),
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error.InputOutput => log.warn("error.InputOutput", .{}),
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error.NoSpaceLeft => log.warn("error.NoSpaceLeft", .{}),
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error.DeviceBusy => log.warn("error.DeviceBusy", .{}),
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error.InvalidArgument => log.warn("error.InvalidArgument", .{}),
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error.AccessDenied => log.warn("error.AccessDenied", .{}),
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error.BrokenPipe => log.warn("error.BrokenPipe", .{}),
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error.SystemResources => log.warn("error.SystemResources", .{}),
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error.OperationAborted => log.warn("error.OperationAborted", .{}),
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error.NotOpenForWriting => log.warn("error.NotOpenForWriting", .{}),
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error.LockViolation => log.warn("error.LockViolation", .{}),
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error.WouldBlock => log.warn("error.WouldBlock", .{}),
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error.ConnectionResetByPeer => log.warn("error.ConnectionResetByPeer", .{}),
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error.Unexpected => log.warn("error.Unexpected", .{}),
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}
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return -1;
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};
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output_buffer_len.* = @intCast(hexfbs.pos);
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return 0;
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}
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const std = @import("std");
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pub fn hexdump(stream: anytype, header: []const u8, buffer: []const u8) std.posix.WriteError!void
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{
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// Print a header.
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if (header.len > 0) {
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var hdr: [64]u8 = undefined;
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const offset: usize = (hdr.len / 2) - ((header.len / 2) - 1);
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@memset(hdr[0..hdr.len], ' ');
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std.mem.copyForwards(u8, hdr[offset..hdr.len], header);
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try stream.writeAll(hdr[0..hdr.len]);
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try stream.writeAll("\n");
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}
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var hexb: u32 = 0;
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var ascii: [16]u8 = undefined;
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// First line, first left side (simple number).
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try stream.print(" {d:0>4}: ", .{hexb});
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// Loop on all values in the buffer (i from 0 to buffer.len).
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var i: u32 = 0;
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while (i < buffer.len) : (i += 1) {
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// Print actual hexadecimal value.
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try stream.print("{X:0>2} ", .{buffer[i]});
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// What to print (simple ascii text, right side).
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if (buffer[i] >= ' ' and buffer[i] <= '~') {
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ascii[(i % 16)] = buffer[i];
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} else {
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ascii[(i % 16)] = '.';
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}
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// Next input is a multiple of 8 = extra space.
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if ((i + 1) % 8 == 0) {
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try stream.writeAll(" ");
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}
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// No next input: print the right amount of spaces.
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if ((i + 1) == buffer.len) {
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// Each line is 16 bytes to print, each byte takes 3 characters.
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var missing_spaces = 3 * (15 - (i % 16));
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// Missing an extra space if the current index % 16 is less than 7.
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if ((i % 16) < 7) {
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missing_spaces += 1;
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}
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while (missing_spaces > 0) : (missing_spaces -= 1) {
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try stream.writeAll(" ");
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}
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}
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// Every 16 bytes: print ascii text and line return.
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// Case 1: it's been 16 bytes AND it's the last byte to print.
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if ((i + 1) % 16 == 0 and (i + 1) == buffer.len) {
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try stream.print("{s}\n", .{ascii[0..ascii.len]});
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}
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// Case 2: it's been 16 bytes but it's not the end of the buffer.
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else if ((i + 1) % 16 == 0 and (i + 1) != buffer.len) {
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try stream.print("{s}\n", .{ascii[0..ascii.len]});
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hexb += 16;
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try stream.print(" {d:0>4}: ", .{hexb});
|
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}
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||||
// 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) {
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try stream.print(" {s}\n", .{ascii[0..((i + 1) % 16)]});
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||||
}
|
||||
// Case 4: not the end of the 16 bytes row and not the end of the buffer.
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||||
// Do nothing.
|
||||
}
|
||||
}
|
||||
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