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e0ab505a97
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Joe Tsai e0ab505a97 archive/tar: implement Writer support for sparse files 
This CL is the second step (of two; part1 is CL/56771) for adding
sparse file support to the Writer.

There are no new identifiers exported in this CL, but this does make
use of Header.SparseHoles added in part1. If the Typeflag is set to
TypeGNUSparse or len(SparseHoles) > 0, then the Writer will emit an
sparse file, where the holes must be written by the user as zeros.

If TypeGNUSparse is set, then the output file must use the GNU format.
Otherwise, it must use the PAX format (with GNU-defined PAX keys).

A future CL may export Reader.Discard and Writer.FillZeros,
but those methods are currently unexported, and only used by the
tests for efficiency reasons.
Calling Discard or FillZeros on a hole 10GiB in size does take
time, even if it is essentially a memcopy.

Updates #13548

Change-Id: Id586d9178c227c0577f796f731ae2cbb72355601
Reviewed-on: https://go-review.googlesource.com/57212
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2017-08-23 22:38:45 +00:00
.github .github: update ISSUE_TEMPLATE to be closer to 'go bug' 2017-08-19 04:06:10 +00:00
api doc, api: add syscall.SysProcAttr.AmbientCaps change to 1.9 notes, API 2017-06-29 03:29:46 +00:00
doc doc/go1.9: fix typo in Moved GOROOT 2017-08-21 04:41:20 +00:00
lib/time time: vendor tzdata-2017b and update test 2017-06-07 21:23:58 +00:00
misc misc/ios: add support for device ids to the exec wrapper 2017-08-21 21:08:17 +00:00
src archive/tar: implement Writer support for sparse files 2017-08-23 22:38:45 +00:00
test cmd/compile: generate makemap calls with int arguments 2017-08-22 20:28:21 +00:00
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.gitignore .gitignore: include only Go project artifiacts 2017-08-15 21:37:05 +00:00
AUTHORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
CONTRIBUTING.md .github: recommend 'go bug' when filing an issue 2017-07-24 17:18:34 +00:00
CONTRIBUTORS A+C: final updates for Go 1.9 2017-07-18 01:47:54 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
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README.md readme: add attribution for the Gopher image 2017-02-03 19:39:41 +00:00
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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