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Shortcut JSBigFileString in when no offset is used

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Reviewed By: mhorowitz

Differential Revision: D5227225

fbshipit-source-id: a50688c8b873bf08ea10fafaa143df130f59dfaa
This commit is contained in:
Pieter De Baets 2017-09-05 03:07:16 -07:00 committed by Facebook Github Bot
parent eb6ba0b041
commit 8497ec297c
1 changed files with 13 additions and 8 deletions
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21
ReactCommon/cxxreact/JSBigString.h
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@ -112,20 +112,25 @@ public:
: m_fd {-1} : m_fd {-1}
, m_data {nullptr} , m_data {nullptr}
{ {
folly::checkUnixError( folly::checkUnixError(m_fd = dup(fd),
m_fd = dup(fd), "Could not duplicate file descriptor");
"Could not duplicate file descriptor");
// Offsets given to mmap must be page aligend. We abstract away that // Offsets given to mmap must be page aligend. We abstract away that
// restriction by sending a page aligned offset to mmap, and keeping track // restriction by sending a page aligned offset to mmap, and keeping track
// of the offset within the page that we must alter the mmap pointer by to // of the offset within the page that we must alter the mmap pointer by to
// get the final desired offset. // get the final desired offset.
auto ps = getpagesize(); if (offset != 0) {
auto d = lldiv(offset, ps); const static auto ps = getpagesize();
auto d = lldiv(offset, ps);
m_mapOff = d.quot; m_mapOff = d.quot;
m_pageOff = d.rem; m_pageOff = d.rem;
m_size = size + m_pageOff; m_size = size + m_pageOff;
} else {
m_mapOff = 0;
m_pageOff = 0;
m_size = size;
}
} }
~JSBigFileString() { ~JSBigFileString() {