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std.Io: delete LimitedReader

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Andrew Kelley 2025-08-01 00:24:35 -07:00
parent 499bf2a1c7
commit 4d4251c9f9
2 changed files with 0 additions and 49 deletions
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4
lib/std/Io.zig
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@ -431,10 +431,6 @@ pub const bufferedWriter = @import("Io/buffered_writer.zig").bufferedWriter;
pub const FixedBufferStream = @import("Io/fixed_buffer_stream.zig").FixedBufferStream; pub const FixedBufferStream = @import("Io/fixed_buffer_stream.zig").FixedBufferStream;
/// Deprecated in favor of `Reader`. /// Deprecated in favor of `Reader`.
pub const fixedBufferStream = @import("Io/fixed_buffer_stream.zig").fixedBufferStream; pub const fixedBufferStream = @import("Io/fixed_buffer_stream.zig").fixedBufferStream;
/// Deprecated in favor of `Reader.Limited`.
pub const LimitedReader = @import("Io/limited_reader.zig").LimitedReader;
/// Deprecated in favor of `Reader.Limited`.
pub const limitedReader = @import("Io/limited_reader.zig").limitedReader;
/// Deprecated with no replacement; inefficient pattern /// Deprecated with no replacement; inefficient pattern
pub const CountingWriter = @import("Io/counting_writer.zig").CountingWriter; pub const CountingWriter = @import("Io/counting_writer.zig").CountingWriter;
/// Deprecated with no replacement; inefficient pattern /// Deprecated with no replacement; inefficient pattern

45
lib/std/Io/limited_reader.zig
View file

@ -1,45 +0,0 @@
const std = @import("../std.zig");
const io = std.io;
const assert = std.debug.assert;
const testing = std.testing;
pub fn LimitedReader(comptime ReaderType: type) type {
return struct {
inner_reader: ReaderType,
bytes_left: u64,
pub const Error = ReaderType.Error;
pub const Reader = io.GenericReader(*Self, Error, read);
const Self = @This();
pub fn read(self: *Self, dest: []u8) Error!usize {
const max_read = @min(self.bytes_left, dest.len);
const n = try self.inner_reader.read(dest[0..max_read]);
self.bytes_left -= n;
return n;
}
pub fn reader(self: *Self) Reader {
return .{ .context = self };
}
};
}
/// Returns an initialised `LimitedReader`.
/// `bytes_left` is a `u64` to be able to take 64 bit file offsets
pub fn limitedReader(inner_reader: anytype, bytes_left: u64) LimitedReader(@TypeOf(inner_reader)) {
return .{ .inner_reader = inner_reader, .bytes_left = bytes_left };
}
test "basic usage" {
const data = "hello world";
var fbs = std.io.fixedBufferStream(data);
var early_stream = limitedReader(fbs.reader(), 3);
var buf: [5]u8 = undefined;
try testing.expectEqual(@as(usize, 3), try early_stream.reader().read(&buf));
try testing.expectEqualSlices(u8, data[0..3], buf[0..3]);
try testing.expectEqual(@as(usize, 0), try early_stream.reader().read(&buf));
try testing.expectError(error.EndOfStream, early_stream.reader().skipBytes(10, .{}));
}