[v6.x] fs: fix createReadStream(…, {end: n}) for non-seekable fds
#19411
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82bdf8f fixed an issue by silently modifying the `start` option for the case when only `end` is passed, in order to perform reads from a specified range in the file. However, that approach does not work for non-seekable files, since a numeric `start` option means that positioned reads will be used to read data from the file. This patch fixes that, and instead ends reading after a specified size by adjusting the read buffer size. This way we avoid re-introducing the bug that 82bdf8f fixed, and align behaviour with the native file stream mechanism introduced in nodejs#18936 as well. PR-URL: nodejs#19329 Fixes: nodejs#19240 Refs: nodejs#18121 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Chen Gang <gangc.cxy@foxmail.com>
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MylesBorins
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Mar 20, 2018
82bdf8f fixed an issue by silently modifying the `start` option for the case when only `end` is passed, in order to perform reads from a specified range in the file. However, that approach does not work for non-seekable files, since a numeric `start` option means that positioned reads will be used to read data from the file. This patch fixes that, and instead ends reading after a specified size by adjusting the read buffer size. This way we avoid re-introducing the bug that 82bdf8f fixed, and align behaviour with the native file stream mechanism introduced in #18936 as well. Backport-PR-URL: #19411 PR-URL: #19329 Fixes: #19240 Refs: #18121 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Chen Gang <gangc.cxy@foxmail.com>
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MylesBorins
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Mar 28, 2018
82bdf8f fixed an issue by silently modifying the `start` option for the case when only `end` is passed, in order to perform reads from a specified range in the file. However, that approach does not work for non-seekable files, since a numeric `start` option means that positioned reads will be used to read data from the file. This patch fixes that, and instead ends reading after a specified size by adjusting the read buffer size. This way we avoid re-introducing the bug that 82bdf8f fixed, and align behaviour with the native file stream mechanism introduced in #18936 as well. Backport-PR-URL: #19411 PR-URL: #19329 Fixes: #19240 Refs: #18121 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Chen Gang <gangc.cxy@foxmail.com>
MylesBorins
pushed a commit
that referenced
this pull request
Mar 30, 2018
82bdf8f fixed an issue by silently modifying the `start` option for the case when only `end` is passed, in order to perform reads from a specified range in the file. However, that approach does not work for non-seekable files, since a numeric `start` option means that positioned reads will be used to read data from the file. This patch fixes that, and instead ends reading after a specified size by adjusting the read buffer size. This way we avoid re-introducing the bug that 82bdf8f fixed, and align behaviour with the native file stream mechanism introduced in #18936 as well. Backport-PR-URL: #19411 PR-URL: #19329 Fixes: #19240 Refs: #18121 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Chen Gang <gangc.cxy@foxmail.com>
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Backport #19329 to v6.x
The test file needed to be updated & has merge conflicts from neighbouring tests resolved.
Fixes: #19240