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Abdelrahman Said 2025-07-06 21:43:35 +01:00
parent 9f5da3b3a7
commit 8b9ec5e47b
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75
base64/build.zig Normal file
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const std = @import("std");
// Although this function looks imperative, note that its job is to
// declaratively construct a build graph that will be executed by an external
// runner.
pub fn build(b: *std.Build) void {
// Standard target options allows the person running `zig build` to choose
// what target to build for. Here we do not override the defaults, which
// means any target is allowed, and the default is native. Other options
// for restricting supported target set are available.
const target = b.standardTargetOptions(.{});
// Standard optimization options allow the person running `zig build` to select
// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
// set a preferred release mode, allowing the user to decide how to optimize.
const optimize = b.standardOptimizeOption(.{});
// We will also create a module for our other entry point, 'main.zig'.
const exe_mod = b.createModule(.{
// `root_source_file` is the Zig "entry point" of the module. If a module
// only contains e.g. external object files, you can make this `null`.
// In this case the main source file is merely a path, however, in more
// complicated build scripts, this could be a generated file.
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
});
// This creates another `std.Build.Step.Compile`, but this one builds an executable
// rather than a static library.
const exe = b.addExecutable(.{
.name = "base64",
.root_module = exe_mod,
});
// This declares intent for the executable to be installed into the
// standard location when the user invokes the "install" step (the default
// step when running `zig build`).
b.installArtifact(exe);
// This *creates* a Run step in the build graph, to be executed when another
// step is evaluated that depends on it. The next line below will establish
// such a dependency.
const run_cmd = b.addRunArtifact(exe);
// By making the run step depend on the install step, it will be run from the
// installation directory rather than directly from within the cache directory.
// This is not necessary, however, if the application depends on other installed
// files, this ensures they will be present and in the expected location.
run_cmd.step.dependOn(b.getInstallStep());
// This allows the user to pass arguments to the application in the build
// command itself, like this: `zig build run -- arg1 arg2 etc`
if (b.args) |args| {
run_cmd.addArgs(args);
}
// This creates a build step. It will be visible in the `zig build --help` menu,
// and can be selected like this: `zig build run`
// This will evaluate the `run` step rather than the default, which is "install".
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
const exe_unit_tests = b.addTest(.{
.root_module = exe_mod,
});
const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
// Similar to creating the run step earlier, this exposes a `test` step to
// the `zig build --help` menu, providing a way for the user to request
// running the unit tests.
const test_step = b.step("test", "Run unit tests");
test_step.dependOn(&run_exe_unit_tests.step);
}

86
base64/build.zig.zon Normal file
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.{
// This is the default name used by packages depending on this one. For
// example, when a user runs `zig fetch --save <url>`, this field is used
// as the key in the `dependencies` table. Although the user can choose a
// different name, most users will stick with this provided value.
//
// It is redundant to include "zig" in this name because it is already
// within the Zig package namespace.
.name = .base64,
// This is a [Semantic Version](https://semver.org/).
// In a future version of Zig it will be used for package deduplication.
.version = "0.0.0",
// Together with name, this represents a globally unique package
// identifier. This field is generated by the Zig toolchain when the
// package is first created, and then *never changes*. This allows
// unambiguous detection of one package being an updated version of
// another.
//
// When forking a Zig project, this id should be regenerated (delete the
// field and run `zig build`) if the upstream project is still maintained.
// Otherwise, the fork is *hostile*, attempting to take control over the
// original project's identity. Thus it is recommended to leave the comment
// on the following line intact, so that it shows up in code reviews that
// modify the field.
.fingerprint = 0xcf92327682ca7f6d, // Changing this has security and trust implications.
// Tracks the earliest Zig version that the package considers to be a
// supported use case.
.minimum_zig_version = "0.14.1",
// This field is optional.
// Each dependency must either provide a `url` and `hash`, or a `path`.
// `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
// Once all dependencies are fetched, `zig build` no longer requires
// internet connectivity.
.dependencies = .{
// See `zig fetch --save <url>` for a command-line interface for adding dependencies.
//.example = .{
// // When updating this field to a new URL, be sure to delete the corresponding
// // `hash`, otherwise you are communicating that you expect to find the old hash at
// // the new URL. If the contents of a URL change this will result in a hash mismatch
// // which will prevent zig from using it.
// .url = "https://example.com/foo.tar.gz",
//
// // This is computed from the file contents of the directory of files that is
// // obtained after fetching `url` and applying the inclusion rules given by
// // `paths`.
// //
// // This field is the source of truth; packages do not come from a `url`; they
// // come from a `hash`. `url` is just one of many possible mirrors for how to
// // obtain a package matching this `hash`.
// //
// // Uses the [multihash](https://multiformats.io/multihash/) format.
// .hash = "...",
//
// // When this is provided, the package is found in a directory relative to the
// // build root. In this case the package's hash is irrelevant and therefore not
// // computed. This field and `url` are mutually exclusive.
// .path = "foo",
//
// // When this is set to `true`, a package is declared to be lazily
// // fetched. This makes the dependency only get fetched if it is
// // actually used.
// .lazy = false,
//},
},
// Specifies the set of files and directories that are included in this package.
// Only files and directories listed here are included in the `hash` that
// is computed for this package. Only files listed here will remain on disk
// when using the zig package manager. As a rule of thumb, one should list
// files required for compilation plus any license(s).
// Paths are relative to the build root. Use the empty string (`""`) to refer to
// the build root itself.
// A directory listed here means that all files within, recursively, are included.
.paths = .{
"build.zig",
"build.zig.zon",
"src",
// For example...
//"LICENSE",
//"README.md",
},
}

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base64/src/base64.zig Normal file
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const std = @import("std");
pub const Base64 = struct {
_table: *const [64]u8,
pub fn init() Base64 {
const upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const lower = "abcdefghijklmnopqrstuvwxyz";
const numsym = "0123456789+/";
return Base64 {
._table = upper ++ lower ++ numsym,
};
}
pub fn encode(self: Base64, allocator: std.mem.Allocator, input: [] const u8) ![]u8 {
if (input.len == 0) {
return "";
}
const n_out = try _calc_encode_length(input);
const out = try allocator.alloc(u8, n_out);
var buf = [3]u8{0, 0, 0};
var count: u8 = 0;
var iout: u64 = 0;
for (input, 0..) |_, i| {
buf[count] = input[i];
count += 1;
if (count == 3) {
out[iout] = self._char_at(buf[0] >> 2);
out[iout + 1] = self._char_at(((buf[0] & 0x03) << 4) + (buf[1] >> 4));
out[iout + 2] = self._char_at(((buf[1] & 0x0f) << 2) + (buf[2] >> 6));
out[iout + 3] = self._char_at(buf[2] & 0x3f);
iout += 4;
count = 0;
}
}
if (count == 1) {
out[iout] = self._char_at(buf[0] >> 2);
out[iout + 1] = self._char_at((buf[0] & 0x03) << 4);
out[iout + 2] = '=';
out[iout + 3] = '=';
}
if (count == 2) {
out[iout] = self._char_at(buf[0] >> 2);
out[iout + 1] = self._char_at(((buf[0] & 0x03) << 4) + (buf[1] >> 4));
out[iout + 2] = self._char_at((buf[1] & 0x0f) << 2);
out[iout + 3] = '=';
iout += 4;
}
return out;
}
pub fn decode(self: Base64, allocator: std.mem.Allocator, input: [] const u8) ![]u8 {
if (input.len == 0) {
return "";
}
const n_out = try _calc_decode_length(input);
const out = try allocator.alloc(u8, n_out);
var buf = [4]u8{0, 0, 0, 0};
var count: u8 = 0;
var iout: u64 = 0;
for (input, 0..) |_, i| {
buf[count] = self._char_index(input[i]);
count += 1;
if (count == 4) {
out[iout] = (buf[0] << 2) + (buf[1] >> 4);
if (buf[2] != 64) {
out[iout + 1] = (buf[1] << 4) + (buf[2] >> 2);
}
if (buf[3] != 64) {
out[iout + 2] = (buf[2] << 6) + buf[3];
}
iout += 3;
count = 0;
}
}
return out;
}
fn _char_at(self: Base64, index: usize) u8 {
return self._table[index];
}
fn _char_index(self: Base64, char: u8) u8 {
if (char == '=') {
return 64;
}
var index: u8 = 0;
for (0..63) |i| {
if (self._char_at(i) == char) {
break;
}
index += 1;
}
return index;
}
fn _calc_encode_length(input: [] const u8) !usize {
if (input.len < 3) {
return 4;
}
const n_groups = try std.math.divCeil(usize, input.len, 3);
return n_groups * 4;
}
fn _calc_decode_length(input: [] const u8) !usize {
if (input.len < 4) {
return 3;
}
const n_groups = try std.math.divFloor(usize, input.len, 4);
var groups: usize = n_groups * 3;
var i: usize = input.len - 1;
while (i > 0) : (i -= 1) {
if (input[i] == '=') {
groups -= 1;
}
}
return groups;
}
};

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base64/src/main.zig Normal file
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const std = @import("std");
const Base64 = @import("base64.zig").Base64;
pub fn main() !void {
const stdout = std.io.getStdOut().writer();
var memory_buffer: [1000]u8 = undefined;
var fba = std.heap.FixedBufferAllocator.init(
&memory_buffer
);
const allocator = fba.allocator();
const text = "Testing some more stuff";
const etext = "VGVzdGluZyBzb21lIG1vcmUgc3R1ZmY=";
const base64 = Base64.init();
const encoded_text = try base64.encode(allocator, text);
const decoded_text = try base64.decode(allocator, etext);
try stdout.print("Encoded text: {s}\n", .{encoded_text});
try stdout.print("Decoded text: {s}\n", .{decoded_text});
}