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const bun = @import("root").bun;
const std = @import("std");
const zlib = @import("./zlib.zig");
const brotli = bun.brotli;
const String = bun.String;
pub const Error = struct {
// To workaround a zig compiler bug, we avoid using String here.
code: []const u8,
message: []const u8,
};
pub const Ownership = enum { transfer, must_copy };
pub const Completion = enum { last, not_last };
pub const Controller = struct {
ctx: *anyopaque,
max_to_receive: ?*usize = null,
closed: *bool,
receive_data_fn: *const fn (*anyopaque, []const u8, Ownership, Completion) void,
receive_error_fn: *const fn (*anyopaque, Error) void,
pull_fn: *const fn (*anyopaque) void,
pub fn enqueue(this: *const Controller, data: []const u8, ownership: Ownership, completion: Completion) void {
this.receive_data_fn(this.ctx, data, ownership, completion);
}
pub fn fail(this: *const Controller, err: Error) void {
this.receive_error_fn(this.ctx, err);
}
pub fn pull(this: *const Controller) void {
this.pull_fn(this.ctx);
}
pub fn init(comptime ContextType: type, context: ContextType) Controller {
const Context = std.meta.Child(ContextType);
return Controller{
.ctx = @ptrCast(*anyopaque, context),
.closed = @ptrCast(*bool, &context.closed),
.receive_data_fn = @ptrCast(*const fn (*anyopaque, []const u8, Ownership, Completion) void, &Context.onData),
.receive_error_fn = @ptrCast(*const fn (*anyopaque, Error) void, &Context.onError),
.pull_fn = @ptrCast(*const fn (*anyopaque) void, &Context.onPull),
};
}
};
pub const Compressor = union(enum) {
BrotliEncoder: Brotli.Encoder,
BrotliDecoder: Brotli.Decoder,
pub fn write(this: *Compressor, data: []const u8, controller: Controller) void {
switch (this.*) {
.BrotliEncoder => {
this.BrotliEncoder.write(data, controller);
},
.BrotliDecoder => {
this.BrotliDecoder.write(data, controller);
},
}
}
pub fn end(this: *Compressor, controller: Controller) void {
switch (this.*) {
.BrotliEncoder => {
this.BrotliEncoder.end(controller);
},
.BrotliDecoder => {
this.BrotliDecoder.end(controller);
},
}
}
pub fn initWithType(comptime Type: type, value: Type) !*Compressor {
var compressor = try bun.default_allocator.create(Compressor);
compressor.* = switch (comptime Type) {
Brotli.Encoder => .{ .BrotliEncoder = value },
Brotli.Decoder => .{ .BrotliDecoder = value },
else => @compileError("unsupported compressor type"),
};
return compressor;
}
pub fn init(compressor: anytype) !*Compressor {
return initWithType(@TypeOf(compressor), compressor);
}
};
pub const Brotli = struct {
pub const Encoder = struct {
state: ?*brotli.BrotliEncoderState,
pub fn initWithoutOptions() Encoder {
return Encoder{
.state = brotli.BrotliEncoderState.init(),
};
}
pub fn write(this: *Encoder, data: []const u8, controller: Controller) void {
var state = this.state orelse return;
var input = data;
consume(state, controller);
std.debug.assert(state.write(&input, null, null));
std.debug.assert(state.flush(null, null, null));
consume(state, controller);
}
fn consume(state: *brotli.BrotliEncoderState, controller: Controller) void {
while (!controller.closed.*) {
const to_receive = if (controller.max_to_receive) |max| max.* else 0;
if (isFull(to_receive)) break;
const taken = state.take(to_receive);
if (taken.len == 0)
break;
controller.enqueue(
taken,
.must_copy,
.not_last,
);
if (!state.hasMoreOutput())
break;
}
}
pub fn end(this: *Encoder, controller: Controller) void {
var state = this.state orelse return;
this.state = null;
std.debug.assert(state.finish(null, null, null));
consume(state, controller);
state.deinit();
}
};
pub const Decoder = struct {
state: ?*brotli.BrotliDecoderState,
pub fn initWithoutOptions() Decoder {
return Decoder{
.state = brotli.BrotliDecoderState.init(),
};
}
pub fn write(this: *Decoder, data: []const u8, controller: Controller) void {
var state = this.state orelse return;
var input = data;
while (!controller.closed.* and !state.isFinished()) {
switch (state.write(&input, null, null)) {
.success => {
consume(state, controller, true);
return;
},
.@"error" => {
const code = state.getErrorCode();
controller.fail(Error{
.code = code.code(),
.message = code.message(),
});
return;
},
.needs_more_input => {
controller.pull();
return;
},
.needs_more_output => {
consume(state, controller, false);
},
}
}
}
fn consume(state: *brotli.BrotliDecoderState, controller: Controller, is_last: bool) void {
while (!controller.closed.*) {
const to_receive = if (controller.max_to_receive) |max| max.* else 0;
if (isFull(to_receive)) break;
const taken = state.take(to_receive);
if (taken.len == 0)
break;
controller.enqueue(
taken,
.must_copy,
if (!state.hasMoreOutput() and is_last) .last else .not_last,
);
if (!state.hasMoreOutput())
break;
}
}
pub fn end(this: *Decoder, controller: Controller) void {
var state = this.state orelse return;
this.state = null;
consume(state, controller, true);
state.deinit();
}
};
};
fn isFull(size: usize) bool {
return size == std.math.maxInt(usize);
}
|
