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compress.xz: make reader loop little more readable

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No need to do same error check on two places. First return all
uncompressed data then on last read check error.
This commit is contained in:
Igor Anić 2024-03-13 18:41:20 +01:00
parent a21f9b6d8b
commit 54f882c4aa
1 changed files with 7 additions and 13 deletions
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20
lib/std/compress/xz/block.zig
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@ -59,24 +59,18 @@ pub fn Decoder(comptime ReaderType: type) type {
pub fn read(self: *Self, output: []u8) Error!usize {
while (true) {
const input = self.to_read.items[self.read_pos..];
if (input.len > 0) {
const n = @min(input.len, output.len);
@memcpy(output[0..n], input[0..n]);
const unread_len = self.to_read.items.len - self.read_pos;
if (unread_len > 0) {
const n = @min(unread_len, output.len);
@memcpy(output[0..n], self.to_read.items[self.read_pos..][0..n]);
self.read_pos += n;
if (self.read_pos == self.to_read.items.len and self.err != null) {
if (self.err.? == DecodeError.EndOfStreamWithNoError) {
return n;
}
return self.err.?;
}
return n;
}
if (self.err != null) {
if (self.err.? == DecodeError.EndOfStreamWithNoError) {
if (self.err) |e| {
if (e == DecodeError.EndOfStreamWithNoError) {
return 0;
}
return self.err.?;
return e;
}
if (self.read_pos > 0) {
self.to_read.shrinkRetainingCapacity(0);