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No commits in common. "1a28dc240488e531dca2937640bebd77d074a389" and "6769ea92afa0139506b5d8b00e2d9f09c93f69d1" have entirely different histories.
1a28dc2404
...
6769ea92af
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@ -15,7 +15,7 @@ fn run(app: *sys.AppContext, graphics: *sys.GraphicsContext) anyerror!void {
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defer _ = gpa.deinit();
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{
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var file_access = try app.data().open(try sys.Path.joined(&.{"ona.lua"}), .readonly);
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var file_access = try (try app.data().joinedPath(&.{"ona.lua"})).open(.readonly);
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defer file_access.close();
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@ -1,5 +1,3 @@
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const Archive = @import("./sys/Archive.zig");
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const ext = @cImport({
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@cInclude("SDL2/SDL.h");
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});
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@ -150,7 +148,7 @@ pub const AppContext = opaque {
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.user_path_prefix = user_path_prefix,
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.data_file_system = .{.archive = .{
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.index_cache = try Archive.IndexCache.init(allocator),
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.index_cache = try FileSystem.ArchiveIndexCache.init(allocator),
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.file_access = data_archive_file_access,
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}},
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@ -271,7 +269,40 @@ pub const AppContext = opaque {
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///
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pub const FileSystem = union(enum) {
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native: []const u8,
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archive: Archive,
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archive: struct {
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file_access: ona.io.FileAccess,
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index_cache: ArchiveIndexCache,
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entry_table: [max_open_entries]ArchiveEntry =
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std.mem.zeroes([max_open_entries]ArchiveEntry),
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const max_open_entries = 16;
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},
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///
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///
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///
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const ArchiveEntry = struct {
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owner: ?*ona.io.FileAccess,
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cursor: u64,
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header: oar.Entry,
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};
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///
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///
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///
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const ArchiveIndexCache = ona.table.Hashed(oar.Path, u64, .{
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.equals = oar.Path.equals,
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.hash = oar.Path.hash,
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});
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///
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/// Platform-agnostic mechanism for referencing files and directories on a [FileSystem].
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///
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pub const Path = struct {
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file_system: *FileSystem,
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path: oar.Path,
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///
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/// With files typically being backed by a block device, they can produce a variety of
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@ -296,11 +327,11 @@ pub const FileSystem = union(enum) {
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/// [OpenMode.readonly] indicates that an existing file is opened in a read-only state,
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/// disallowing write access.
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///
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/// [OpenMode.overwrite] indicates that an empty file has been created or an existing file has
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/// been completely overwritten into.
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/// [OpenMode.overwrite] indicates that an empty file has been created or an existing file
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/// has been completely overwritten into.
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///
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/// [OpenMode.append] indicates that an existing file that has been opened for reading from and
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/// writing to on the end of existing data.
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/// [OpenMode.append] indicates that an existing file that has been opened for reading from
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/// and writing to on the end of existing data.
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///
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pub const OpenMode = enum {
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readonly,
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@ -309,13 +340,38 @@ pub const FileSystem = union(enum) {
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};
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///
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/// Attempts to open the file identified by `path` with `mode` as the mode for opening the file.
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/// Returns `true` if the length of `path` is empty, otherwise `false`.
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///
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/// Returns a [FileAccess] reference that provides access to the file referenced by `path`or a
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/// [OpenError] if it failed.
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pub fn isEmpty(path: Path) bool {
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return (path.length == 0);
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}
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///
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pub fn open(file_system: *FileSystem, path: Path, mode: OpenMode) OpenError!ona.io.FileAccess {
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switch (file_system.*) {
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/// Returns `true` if `this` is equal to `that`, otherwise `false`.
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///
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pub fn equals(this: Path, that: Path) bool {
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return (this.file_system == that.file_system) and
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std.mem.eql(u8, this.buffer[0 .. this.length], that.buffer[0 .. that.length]);
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}
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///
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/// The maximum possible byte-length of a [Path].
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///
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/// Note that paths are encoded using UTF-8, meaning that a character may be bigger than one
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/// byte. Because of this, it is not safe to asume that a path may hold [max] individual
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/// characters.
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///
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pub const max = 255;
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///
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/// Attempts to open the file identified by `path` with `mode` as the mode for opening the
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/// file.
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///
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/// Returns a [FileAccess] reference that provides access to the file referenced by `path`
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/// or a [OpenError] if it failed.
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///
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pub fn open(path: Path, mode: OpenMode) OpenError!ona.io.FileAccess {
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switch (path.file_system.*) {
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.archive => |*archive| {
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if (mode != .readonly) return error.ModeUnsupported;
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@ -323,9 +379,9 @@ pub const FileSystem = union(enum) {
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for (archive.entry_table) |*entry| if (entry.owner == null) {
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const Implementation = struct {
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fn archiveEntryCast(context: *anyopaque) *Archive.Entry {
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return @ptrCast(*Archive.Entry, @alignCast(
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@alignOf(Archive.Entry), context));
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fn archiveEntryCast(context: *anyopaque) *ArchiveEntry {
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return @ptrCast(*ArchiveEntry, @alignCast(
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@alignOf(ArchiveEntry), context));
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}
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fn close(context: *anyopaque) void {
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@ -394,29 +450,24 @@ pub const FileSystem = union(enum) {
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}
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};
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const Header = oar.Entry;
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if (archive.index_cache.lookup(path)) |index| {
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if (archive.index_cache.lookup(path.path)) |index| {
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archive.file_access.seek(index) catch return error.FileNotFound;
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entry.* = .{
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.owner = &archive.file_access,
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.cursor = 0,
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.header = (Header.next(archive.file_access) catch
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return error.FileNotFound) orelse {
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.header = (oar.Entry.next(archive.file_access) catch return error.FileNotFound) orelse {
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// Remove cannot fail if lookup succeeded.
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std.debug.assert(archive.index_cache.remove(path) != null);
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std.debug.assert(archive.index_cache.remove(path.path) != null);
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return error.FileNotFound;
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},
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};
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} else {
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while (Header.next(archive.file_access) catch
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return error.FileNotFound) |entry_header| {
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if (entry.header.path.equals(path)) entry.* = .{
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while (oar.Entry.next(archive.file_access) catch return error.FileNotFound) |entry_header| {
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if (entry.header.path.equals(path.path))
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entry.* = .{
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.owner = &archive.file_access,
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.cursor = 0,
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.header = entry_header,
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@ -448,17 +499,19 @@ pub const FileSystem = union(enum) {
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if (native.len == 0) return error.FileNotFound;
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var path_buffer = std.mem.zeroes([4096]u8);
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const seperator_length = @boolToInt(native[native.len - 1] != oar.Path.seperator);
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const seperator_length = @boolToInt(native[native.len - 1] != seperator);
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if ((native.len + seperator_length + path.length) >=
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if ((native.len + seperator_length + path.path.length) >=
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path_buffer.len) return error.FileNotFound;
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std.mem.copy(u8, path_buffer[0 ..], native);
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if (seperator_length != 0) path_buffer[native.len] = oar.Path.seperator;
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if (seperator_length != 0) path_buffer[native.len] = seperator;
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std.mem.copy(u8, path_buffer[native.len .. path_buffer.
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len], path.buffer[0 .. path.length]);
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len], path.path.buffer[0 .. path.path.length]);
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ext.SDL_ClearError();
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const FileAccess = ona.io.FileAccess;
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@ -538,8 +591,6 @@ pub const FileSystem = union(enum) {
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}
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};
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ext.SDL_ClearError();
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return FileAccess{
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.context = ext.SDL_RWFromFile(&path_buffer, switch (mode) {
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.readonly => "rb",
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@ -560,6 +611,67 @@ pub const FileSystem = union(enum) {
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},
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}
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}
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pub const seperator = '/';
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};
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///
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/// [PathError.TooLong] occurs when creating a path that is greater than the maximum size **in
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/// bytes**.
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///
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pub const PathError = error {
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TooLong,
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};
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///
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/// Attempts to create a [Path] with `file_system` as the file-system root and the path
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/// components in `sequences` as a fully qualified path from the root.
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///
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/// A [Path] value is returned containing the fully qualified path from the file-system root or
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/// a [PathError] if it could not be created.
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///
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pub fn joinedPath(file_system: *FileSystem, sequences: []const []const u8) PathError!Path {
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var path = Path{
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.file_system = file_system,
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.path = oar.Path.empty,
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};
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if (sequences.len != 0) {
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const last_sequence_index = sequences.len - 1;
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for (sequences) |sequence, index| if (sequence.len != 0) {
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var components = ona.io.Spliterator(u8){
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.source = sequence,
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.delimiter = "/",
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};
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while (components.next()) |component| if (component.len != 0) {
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for (component) |byte| {
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if (path.path.length == Path.max) return error.TooLong;
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path.path.buffer[path.path.length] = byte;
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path.path.length += 1;
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}
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if (components.hasNext()) {
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if (path.path.length == Path.max) return error.TooLong;
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path.path.buffer[path.path.length] = '/';
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path.path.length += 1;
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}
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};
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if (index < last_sequence_index) {
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if (path.path.length == Path.max) return error.TooLong;
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path.path.buffer[path.path.length] = '/';
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path.path.length += 1;
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}
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};
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}
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return path;
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}
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};
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///
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@ -633,11 +745,6 @@ pub const Log = enum(u32) {
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}
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};
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///
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/// Path to a file on a [FileSystem].
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///
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pub const Path = oar.Path;
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///
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/// [RunError.InitFailure] occurs if a necessary resource fails to be acquired or allocated.
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///
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@ -691,7 +798,7 @@ pub fn runGraphics(comptime Error: anytype,
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defer ext.SDL_DestroyRenderer(renderer);
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var cwd_file_system = FileSystem{.native ="./"};
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var data_access = try cwd_file_system.open(try Path.joined(&.{"./data.oar"}), .readonly);
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var data_access = try (try cwd_file_system.joinedPath(&.{"./data.oar"})).open(.readonly);
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defer data_access.close();
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@ -1,29 +0,0 @@
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const oar = @import("oar");
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const ona = @import("ona");
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const std = @import("std");
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file_access: ona.io.FileAccess,
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index_cache: IndexCache,
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entry_table: [max_open_entries]Entry = std.mem.zeroes([max_open_entries]Entry),
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///
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/// Hard limit on the maximum number of entries open at once.
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///
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const max_open_entries = 16;
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///
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/// Stateful extension of an [oar.Entry].
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///
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pub const Entry = struct {
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owner: ?*ona.io.FileAccess,
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cursor: u64,
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header: oar.Entry,
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};
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///
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/// Table cache for associating [oar.Path] values with offsets to entries in a given file.
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///
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pub const IndexCache = ona.table.Hashed(oar.Path, u64, .{
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.equals = oar.Path.equals,
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.hash = oar.Path.hash,
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});
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@ -55,14 +55,6 @@ pub const Path = extern struct {
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buffer: [255]u8,
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length: u8,
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///
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/// [Error.TooLong] occurs when creating a path that is greater than the maximum path size **in
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/// bytes**.
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///
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pub const Error = error {
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TooLong,
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};
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///
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/// An empty [Path] with a length of `0`.
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///
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@ -82,63 +74,6 @@ pub const Path = extern struct {
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pub fn hash(path: Path) usize {
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return ona.io.hashBytes(path.buffer[0 .. path.length]);
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}
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///
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/// Attempts to create a [Path] with the path components in `sequences` as a fully qualified
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/// path from root.
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///
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/// A [Path] value is returned containing the fully qualified path from the file-system root or
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/// a [Error] if it could not be created.
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///
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pub fn joined(sequences: []const []const u8) Error!Path {
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var path = empty;
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if (sequences.len != 0) {
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const last_sequence_index = sequences.len - 1;
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for (sequences) |sequence, index| if (sequence.len != 0) {
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var components = ona.io.Spliterator(u8){
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.source = sequence,
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.delimiter = "/",
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};
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while (components.next()) |component| if (component.len != 0) {
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for (component) |byte| {
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if (path.length == max) return error.TooLong;
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path.buffer[path.length] = byte;
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path.length += 1;
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}
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if (components.hasNext()) {
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if (path.length == max) return error.TooLong;
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path.buffer[path.length] = '/';
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path.length += 1;
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}
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};
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if (index < last_sequence_index) {
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if (path.length == max) return error.TooLong;
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path.buffer[path.length] = '/';
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path.length += 1;
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}
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};
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}
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return path;
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}
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///
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/// Maximum number of **bytes** in a [Path].
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///
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pub const max = 255;
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///
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/// Textual separator between components of a [Path].
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///
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pub const seperator = '/';
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};
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///
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