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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ContentRange.h"
#include "nsContentUtils.h"
mozilla::net::ContentRange::ContentRange(const nsACString& aRangeHeader,
uint64_t aSize)
: mStart(0), mEnd(0), mSize(0) {
auto parsed = nsContentUtils::ParseSingleRangeRequest(aRangeHeader, true);
// https://fetch.spec.whatwg.org/#ref-for-simple-range-header-value%E2%91%A1
// If rangeValue is failure, then return a network error.
if (!parsed) {
return;
}
// Sanity check: ParseSingleRangeRequest should handle these two cases.
// If rangeEndValue and rangeStartValue are null, then return failure.
MOZ_ASSERT(parsed->Start().isSome() || parsed->End().isSome());
// If rangeStartValue and rangeEndValue are numbers, and rangeStartValue
// is greater than rangeEndValue, then return failure.
MOZ_ASSERT(parsed->Start().isNothing() || parsed->End().isNothing() ||
*parsed->Start() <= *parsed->End());
// https://fetch.spec.whatwg.org/#ref-for-simple-range-header-value%E2%91%A1
// If rangeStart is null:
if (parsed->Start().isNothing()) {
// Set rangeStart to fullLength − rangeEnd.
mStart = aSize - *parsed->End();
// Set rangeEnd to rangeStart + rangeEnd − 1.
mEnd = mStart + *parsed->End() - 1;
// Otherwise:
} else {
// If rangeStart is greater than or equal to fullLength, then return a
// network error.
if (*parsed->Start() >= aSize) {
return;
}
mStart = *parsed->Start();
// If rangeEnd is null or rangeEnd is greater than or equal to fullLength,
// then set rangeEnd to fullLength − 1.
if (parsed->End().isNothing() || *parsed->End() >= aSize) {
mEnd = aSize - 1;
} else {
mEnd = *parsed->End();
}
}
mSize = aSize;
}
void mozilla::net::ContentRange::AsHeader(nsACString& aOutString) const {
aOutString.Assign("bytes "_ns);
aOutString.AppendInt(mStart);
aOutString.AppendLiteral("-");
aOutString.AppendInt(mEnd);
aOutString.AppendLiteral("/");
aOutString.AppendInt(mSize);
}
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