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std.Io: delete ChangeDetectionStream

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dead code
This commit is contained in:
Andrew Kelley 2025-07-20 17:13:23 -07:00
parent d9a5a3e8c5
commit 03a6892189
2 changed files with 0 additions and 58 deletions
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3
lib/std/Io.zig
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@ -462,9 +462,6 @@ pub const bitReader = @import("Io/bit_reader.zig").bitReader;
pub const BitWriter = @import("Io/bit_writer.zig").BitWriter;
pub const bitWriter = @import("Io/bit_writer.zig").bitWriter;
pub const ChangeDetectionStream = @import("Io/change_detection_stream.zig").ChangeDetectionStream;
pub const changeDetectionStream = @import("Io/change_detection_stream.zig").changeDetectionStream;
pub const FindByteWriter = @import("Io/find_byte_writer.zig").FindByteWriter;
pub const findByteWriter = @import("Io/find_byte_writer.zig").findByteWriter;

55
lib/std/Io/change_detection_stream.zig
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@ -1,55 +0,0 @@
const std = @import("../std.zig");
const io = std.io;
const mem = std.mem;
const assert = std.debug.assert;
/// Used to detect if the data written to a stream differs from a source buffer
pub fn ChangeDetectionStream(comptime WriterType: type) type {
return struct {
const Self = @This();
pub const Error = WriterType.Error;
pub const Writer = io.GenericWriter(*Self, Error, write);
anything_changed: bool,
underlying_writer: WriterType,
source_index: usize,
source: []const u8,
pub fn writer(self: *Self) Writer {
return .{ .context = self };
}
fn write(self: *Self, bytes: []const u8) Error!usize {
if (!self.anything_changed) {
const end = self.source_index + bytes.len;
if (end > self.source.len) {
self.anything_changed = true;
} else {
const src_slice = self.source[self.source_index..end];
self.source_index += bytes.len;
if (!mem.eql(u8, bytes, src_slice)) {
self.anything_changed = true;
}
}
}
return self.underlying_writer.write(bytes);
}
pub fn changeDetected(self: *Self) bool {
return self.anything_changed or (self.source_index != self.source.len);
}
};
}
pub fn changeDetectionStream(
source: []const u8,
underlying_writer: anytype,
) ChangeDetectionStream(@TypeOf(underlying_writer)) {
return ChangeDetectionStream(@TypeOf(underlying_writer)){
.anything_changed = false,
.underlying_writer = underlying_writer,
.source_index = 0,
.source = source,
};
}