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I originally removed these in 402f967ed5339fa3d828b7fe1d57cdb5bf38dbf2.
I allowed them to be added back in #15299 because they were smuggled in
alongside a bug fix, however, I wasn't kidding when I said that I wanted
to take the design of std.http in a different direction than using this
data structure.
Instead, some headers are provided via explicit field names populated
while parsing the HTTP request/response, and some are provided via
new fields that support passing extra, arbitrary headers.
This resulted in simplification of logic in many places, as well as
elimination of the possibility of failure in many places. There is
less deinitialization code happening now.
Furthermore, it made it no longer necessary to clone the headers data
structure in order to handle redirects.
http_proxy and https_proxy fields are now pointers since it is common
for them to be unpopulated.
loadDefaultProxies is changed into initDefaultProxies to communicate
that it does not actually load anything from disk or from the network.
The function now is leaky; the API user must pass an already
instantiated arena allocator. Removes the need to deinitialize proxies.
Before, proxies stored arbitrary sets of headers. Now they only store
the authorization value.
Removed the duplicated code between https_proxy and http_proxy. Finally,
parsing failures of the environment variables result in errors being
emitted rather than silently ignoring the proxy.
error.CompressionNotSupported is renamed to
error.CompressionUnsupported, matching the naming convention from all
the other errors in the same set.
Removed documentation comments that were redundant with field and type
names.
Disabling zstd decompression in the server for now; see #18937.
I found some apparently dead code in src/Package/Fetch/git.zig. I want
to check with Ian about this.
I discovered that test/standalone/http.zig is dead code, it is only
being compiled but not being run. Furthermore it hangs at the end if you
run it manually. The previous commits in this branch were written under
the assumption that this test was being run with
`zig build test-standalone`.
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Zig deflate compression/decompression implementation. It supports compression and decompression of gzip, zlib and raw deflate format.
Fixes #18062.
This PR replaces current compress/gzip and compress/zlib packages. Deflate package is renamed to flate. Flate is common name for deflate/inflate where deflate is compression and inflate decompression.
There are breaking change. Methods signatures are changed because of removal of the allocator, and I also unified API for all three namespaces (flate, gzip, zlib).
Currently I put old packages under v1 namespace they are still available as compress/v1/gzip, compress/v1/zlib, compress/v1/deflate. Idea is to give users of the current API little time to postpone analyzing what they had to change. Although that rises question when it is safe to remove that v1 namespace.
Here is current API in the compress package:
```Zig
// deflate
fn compressor(allocator, writer, options) !Compressor(@TypeOf(writer))
fn Compressor(comptime WriterType) type
fn decompressor(allocator, reader, null) !Decompressor(@TypeOf(reader))
fn Decompressor(comptime ReaderType: type) type
// gzip
fn compress(allocator, writer, options) !Compress(@TypeOf(writer))
fn Compress(comptime WriterType: type) type
fn decompress(allocator, reader) !Decompress(@TypeOf(reader))
fn Decompress(comptime ReaderType: type) type
// zlib
fn compressStream(allocator, writer, options) !CompressStream(@TypeOf(writer))
fn CompressStream(comptime WriterType: type) type
fn decompressStream(allocator, reader) !DecompressStream(@TypeOf(reader))
fn DecompressStream(comptime ReaderType: type) type
// xz
fn decompress(allocator: Allocator, reader: anytype) !Decompress(@TypeOf(reader))
fn Decompress(comptime ReaderType: type) type
// lzma
fn decompress(allocator, reader) !Decompress(@TypeOf(reader))
fn Decompress(comptime ReaderType: type) type
// lzma2
fn decompress(allocator, reader, writer !void
// zstandard:
fn DecompressStream(ReaderType, options) type
fn decompressStream(allocator, reader) DecompressStream(@TypeOf(reader), .{})
struct decompress
```
The proposed naming convention:
- Compressor/Decompressor for functions which return type, like Reader/Writer/GeneralPurposeAllocator
- compressor/compressor for functions which are initializers for that type, like reader/writer/allocator
- compress/decompress for one shot operations, accepts reader/writer pair, like read/write/alloc
```Zig
/// Compress from reader and write compressed data to the writer.
fn compress(reader: anytype, writer: anytype, options: Options) !void
/// Create Compressor which outputs the writer.
fn compressor(writer: anytype, options: Options) !Compressor(@TypeOf(writer))
/// Compressor type
fn Compressor(comptime WriterType: type) type
/// Decompress from reader and write plain data to the writer.
fn decompress(reader: anytype, writer: anytype) !void
/// Create Decompressor which reads from reader.
fn decompressor(reader: anytype) Decompressor(@TypeOf(reader)
/// Decompressor type
fn Decompressor(comptime ReaderType: type) type
```
Comparing this implementation with the one we currently have in Zig's standard library (std).
Std is roughly 1.2-1.4 times slower in decompression, and 1.1-1.2 times slower in compression. Compressed sizes are pretty much same in both cases.
More resutls in [this](https://github.com/ianic/flate) repo.
This library uses static allocations for all structures, doesn't require allocator. That makes sense especially for deflate where all structures, internal buffers are allocated to the full size. Little less for inflate where we std version uses less memory by not preallocating to theoretical max size array which are usually not fully used.
For deflate this library allocates 395K while std 779K.
For inflate this library allocates 74.5K while std around 36K.
Inflate difference is because we here use 64K history instead of 32K in std.
If merged existing usage of compress gzip/zlib/deflate need some changes. Here is example with necessary changes in comments:
```Zig
const std = @import("std");
// To get this file:
// wget -nc -O war_and_peace.txt https://www.gutenberg.org/ebooks/2600.txt.utf-8
const data = @embedFile("war_and_peace.txt");
pub fn main() !void {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer std.debug.assert(gpa.deinit() == .ok);
const allocator = gpa.allocator();
try oldDeflate(allocator);
try new(std.compress.flate, allocator);
try oldZlib(allocator);
try new(std.compress.zlib, allocator);
try oldGzip(allocator);
try new(std.compress.gzip, allocator);
}
pub fn new(comptime pkg: type, allocator: std.mem.Allocator) !void {
var buf = std.ArrayList(u8).init(allocator);
defer buf.deinit();
// Compressor
var cmp = try pkg.compressor(buf.writer(), .{});
_ = try cmp.write(data);
try cmp.finish();
var fbs = std.io.fixedBufferStream(buf.items);
// Decompressor
var dcp = pkg.decompressor(fbs.reader());
const plain = try dcp.reader().readAllAlloc(allocator, std.math.maxInt(usize));
defer allocator.free(plain);
try std.testing.expectEqualSlices(u8, data, plain);
}
pub fn oldDeflate(allocator: std.mem.Allocator) !void {
const deflate = std.compress.v1.deflate;
// Compressor
var buf = std.ArrayList(u8).init(allocator);
defer buf.deinit();
// Remove allocator
// Rename deflate -> flate
var cmp = try deflate.compressor(allocator, buf.writer(), .{});
_ = try cmp.write(data);
try cmp.close(); // Rename to finish
cmp.deinit(); // Remove
// Decompressor
var fbs = std.io.fixedBufferStream(buf.items);
// Remove allocator and last param
// Rename deflate -> flate
// Remove try
var dcp = try deflate.decompressor(allocator, fbs.reader(), null);
defer dcp.deinit(); // Remove
const plain = try dcp.reader().readAllAlloc(allocator, std.math.maxInt(usize));
defer allocator.free(plain);
try std.testing.expectEqualSlices(u8, data, plain);
}
pub fn oldZlib(allocator: std.mem.Allocator) !void {
const zlib = std.compress.v1.zlib;
var buf = std.ArrayList(u8).init(allocator);
defer buf.deinit();
// Compressor
// Rename compressStream => compressor
// Remove allocator
var cmp = try zlib.compressStream(allocator, buf.writer(), .{});
_ = try cmp.write(data);
try cmp.finish();
cmp.deinit(); // Remove
var fbs = std.io.fixedBufferStream(buf.items);
// Decompressor
// decompressStream => decompressor
// Remove allocator
// Remove try
var dcp = try zlib.decompressStream(allocator, fbs.reader());
defer dcp.deinit(); // Remove
const plain = try dcp.reader().readAllAlloc(allocator, std.math.maxInt(usize));
defer allocator.free(plain);
try std.testing.expectEqualSlices(u8, data, plain);
}
pub fn oldGzip(allocator: std.mem.Allocator) !void {
const gzip = std.compress.v1.gzip;
var buf = std.ArrayList(u8).init(allocator);
defer buf.deinit();
// Compressor
// Rename compress => compressor
// Remove allocator
var cmp = try gzip.compress(allocator, buf.writer(), .{});
_ = try cmp.write(data);
try cmp.close(); // Rename to finisho
cmp.deinit(); // Remove
var fbs = std.io.fixedBufferStream(buf.items);
// Decompressor
// Rename decompress => decompressor
// Remove allocator
// Remove try
var dcp = try gzip.decompress(allocator, fbs.reader());
defer dcp.deinit(); // Remove
const plain = try dcp.reader().readAllAlloc(allocator, std.math.maxInt(usize));
defer allocator.free(plain);
try std.testing.expectEqualSlices(u8, data, plain);
}
```
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