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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkTSearch_DEFINED
#define SkTSearch_DEFINED
#include "SkTypes.h"
template <typename T>
int SkTSearch(const T* base, int count, const T& target, size_t elemSize)
{
SkASSERT(count >= 0);
if (count <= 0)
return ~0;
SkASSERT(base != NULL); // base may be NULL if count is zero
int lo = 0;
int hi = count - 1;
while (lo < hi)
{
int mid = (hi + lo) >> 1;
const T* elem = (const T*)((const char*)base + mid * elemSize);
if (*elem < target)
lo = mid + 1;
else
hi = mid;
}
const T* elem = (const T*)((const char*)base + hi * elemSize);
if (*elem != target)
{
if (*elem < target)
hi += 1;
hi = ~hi;
}
return hi;
}
template <typename T>
int SkTSearch(const T* base, int count, const T& target, size_t elemSize,
int (*compare)(const T&, const T&))
{
SkASSERT(count >= 0);
if (count <= 0) {
return ~0;
}
SkASSERT(base != NULL); // base may be NULL if count is zero
int lo = 0;
int hi = count - 1;
while (lo < hi) {
int mid = (hi + lo) >> 1;
const T* elem = (const T*)((const char*)base + mid * elemSize);
if ((*compare)(*elem, target) < 0)
lo = mid + 1;
else
hi = mid;
}
const T* elem = (const T*)((const char*)base + hi * elemSize);
int pred = (*compare)(*elem, target);
if (pred != 0) {
if (pred < 0)
hi += 1;
hi = ~hi;
}
return hi;
}
template <typename T>
int SkTSearch(const T** base, int count, const T* target, size_t elemSize,
int (*compare)(const T*, const T*))
{
SkASSERT(count >= 0);
if (count <= 0)
return ~0;
SkASSERT(base != NULL); // base may be NULL if count is zero
int lo = 0;
int hi = count - 1;
while (lo < hi)
{
int mid = (hi + lo) >> 1;
const T* elem = *(const T**)((const char*)base + mid * elemSize);
if ((*compare)(elem, target) < 0)
lo = mid + 1;
else
hi = mid;
}
const T* elem = *(const T**)((const char*)base + hi * elemSize);
int pred = (*compare)(elem, target);
if (pred != 0)
{
if (pred < 0)
hi += 1;
hi = ~hi;
}
return hi;
}
int SkStrSearch(const char*const* base, int count, const char target[],
size_t target_len, size_t elemSize);
int SkStrSearch(const char*const* base, int count, const char target[],
size_t elemSize);
/** Like SkStrSearch, but treats target as if it were all lower-case. Assumes that
base points to a table of lower-case strings.
*/
int SkStrLCSearch(const char*const* base, int count, const char target[],
size_t target_len, size_t elemSize);
int SkStrLCSearch(const char*const* base, int count, const char target[],
size_t elemSize);
/** Helper class to convert a string to lower-case, but only modifying the ascii
characters. This makes the routine very fast and never changes the string
length, but it is not suitable for linguistic purposes. Normally this is
used for buiding and searching string tables.
*/
class SkAutoAsciiToLC {
public:
SkAutoAsciiToLC(const char str[], size_t len = (size_t)-1);
~SkAutoAsciiToLC();
const char* lc() const { return fLC; }
size_t length() const { return fLength; }
private:
char* fLC; // points to either the heap or fStorage
size_t fLength;
enum {
STORAGE = 64
};
char fStorage[STORAGE+1];
};
extern "C" {
typedef int (*SkQSortCompareProc)(const void*, const void*);
void SkQSort(void* base, size_t count, size_t elemSize, SkQSortCompareProc);
}
#endif
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