132 lines
3.6 KiB
Diff
132 lines
3.6 KiB
Diff
From 4a7d31c87bf41c1de21cb725176d5b34c2a95720 Mon Sep 17 00:00:00 2001
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From: Tsuda Kageyu <tsuda.kageyu@gmail.com>
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Date: Thu, 14 Nov 2013 14:05:32 +0900
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Subject: [PATCH 3/6] Rewrote ByteVector::replace() simpler
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---
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taglib/toolkit/tbytevector.cpp | 77 +++++++++++++++---------------------------
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tests/test_bytevector.cpp | 5 +++
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2 files changed, 33 insertions(+), 49 deletions(-)
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diff --git a/taglib/toolkit/tbytevector.cpp b/taglib/toolkit/tbytevector.cpp
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index b658246..566a20f 100644
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--- a/taglib/toolkit/tbytevector.cpp
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+++ b/taglib/toolkit/tbytevector.cpp
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@@ -31,6 +31,7 @@
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#include <iostream>
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#include <cstdio>
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#include <cstring>
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+#include <cstddef>
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#include <tstring.h>
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#include <tdebug.h>
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@@ -508,62 +509,40 @@ ByteVector &ByteVector::replace(const ByteVector &pattern, const ByteVector &wit
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if(pattern.size() == 0 || pattern.size() > size())
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return *this;
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- const uint withSize = with.size();
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- const uint patternSize = pattern.size();
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- int offset = 0;
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+ const size_t withSize = with.size();
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+ const size_t patternSize = pattern.size();
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+ const ptrdiff_t diff = withSize - patternSize;
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+
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+ size_t offset = 0;
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+ while (true)
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+ {
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+ offset = find(pattern, offset);
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+ if(offset == static_cast<size_t>(-1)) // Use npos in taglib2.
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+ break;
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- if(withSize == patternSize) {
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- // I think this case might be common enough to optimize it
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detach();
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- offset = find(pattern);
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- while(offset >= 0) {
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- ::memcpy(data() + offset, with.data(), withSize);
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- offset = find(pattern, offset + withSize);
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- }
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- return *this;
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- }
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- // calculate new size:
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- uint newSize = 0;
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- for(;;) {
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- int next = find(pattern, offset);
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- if(next < 0) {
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- if(offset == 0)
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- // pattern not found, do nothing:
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- return *this;
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- newSize += size() - offset;
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- break;
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+ if(diff < 0) {
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+ ::memmove(
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+ data() + offset + withSize,
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+ data() + offset + patternSize,
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+ size() - offset - patternSize);
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+ resize(size() + diff);
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}
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- newSize += (next - offset) + withSize;
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- offset = next + patternSize;
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- }
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-
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- // new private data of appropriate size:
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- ByteVectorPrivate *newData = new ByteVectorPrivate(newSize, 0);
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- char *target = DATA(newData);
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- const char *source = data();
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-
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- // copy modified data into new private data:
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- offset = 0;
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- for(;;) {
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- int next = find(pattern, offset);
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- if(next < 0) {
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- ::memcpy(target, source + offset, size() - offset);
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- break;
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+ else if(diff > 0) {
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+ resize(size() + diff);
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+ ::memmove(
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+ data() + offset + withSize,
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+ data() + offset + patternSize,
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+ size() - diff - offset - patternSize);
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}
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- int chunkSize = next - offset;
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- ::memcpy(target, source + offset, chunkSize);
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- target += chunkSize;
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- ::memcpy(target, with.data(), withSize);
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- target += withSize;
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- offset += chunkSize + patternSize;
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- }
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- // replace private data:
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- if(d->deref())
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- delete d;
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+ ::memcpy(data() + offset, with.data(), with.size());
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- d = newData;
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+ offset += withSize;
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+ if(offset > size() - patternSize)
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+ break;
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+ }
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return *this;
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}
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diff --git a/tests/test_bytevector.cpp b/tests/test_bytevector.cpp
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index 9efd23a..eca74f8 100644
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--- a/tests/test_bytevector.cpp
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+++ b/tests/test_bytevector.cpp
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@@ -239,6 +239,11 @@ public:
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a.replace(ByteVector("ab"), ByteVector());
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CPPUNIT_ASSERT_EQUAL(ByteVector("cdf"), a);
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}
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+ {
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+ ByteVector a("abcdabf");
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+ a.replace(ByteVector("bf"), ByteVector("x"));
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+ CPPUNIT_ASSERT_EQUAL(ByteVector("abcdax"), a);
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+ }
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}
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};
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--
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1.8.4.2
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