471 lines
14 KiB
C++
471 lines
14 KiB
C++
/*
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* Copyright (C) 2005 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_STRING8_H
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#define ANDROID_STRING8_H
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#include <utils/Errors.h>
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// Need this for the char16_t type; String8.h should not
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// be depedent on the String16 class.
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#include <utils/String16.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/types.h>
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// ---------------------------------------------------------------------------
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extern "C" {
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typedef uint32_t char32_t;
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size_t strlen32(const char32_t *);
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size_t strnlen32(const char32_t *, size_t);
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/*
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* Returns the length of "src" when "src" is valid UTF-8 string.
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* Returns 0 if src is NULL, 0-length string or non UTF-8 string.
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* This function should be used to determine whether "src" is valid UTF-8
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* characters with valid unicode codepoints. "src" must be null-terminated.
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*
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* If you are going to use other GetUtf... functions defined in this header
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* with string which may not be valid UTF-8 with valid codepoint (form 0 to
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* 0x10FFFF), you should use this function before calling others, since the
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* other functions do not check whether the string is valid UTF-8 or not.
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*
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* If you do not care whether "src" is valid UTF-8 or not, you should use
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* strlen() as usual, which should be much faster.
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*/
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size_t utf8_length(const char *src);
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/*
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* Returns the UTF-32 length of "src".
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*/
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size_t utf32_length(const char *src, size_t src_len);
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/*
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* Returns the UTF-8 length of "src".
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*/
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size_t utf8_length_from_utf16(const char16_t *src, size_t src_len);
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/*
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* Returns the UTF-8 length of "src".
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*/
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size_t utf8_length_from_utf32(const char32_t *src, size_t src_len);
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/*
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* Returns the unicode value at "index".
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* Returns -1 when the index is invalid (equals to or more than "src_len").
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* If returned value is positive, it is able to be converted to char32_t, which
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* is unsigned. Then, if "next_index" is not NULL, the next index to be used is
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* stored in "next_index". "next_index" can be NULL.
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*/
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int32_t utf32_at(const char *src, size_t src_len,
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size_t index, size_t *next_index);
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/*
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* Stores a UTF-32 string converted from "src" in "dst", if "dst_length" is not
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* large enough to store the string, the part of the "src" string is stored
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* into "dst".
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* Returns the size actually used for storing the string.
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* "dst" is not null-terminated when dst_len is fully used (like strncpy).
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*/
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size_t utf8_to_utf32(const char* src, size_t src_len,
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char32_t* dst, size_t dst_len);
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/*
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* Stores a UTF-8 string converted from "src" in "dst", if "dst_length" is not
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* large enough to store the string, the part of the "src" string is stored
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* into "dst" as much as possible. See the examples for more detail.
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* Returns the size actually used for storing the string.
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* dst" is not null-terminated when dst_len is fully used (like strncpy).
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*
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* Example 1
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* "src" == \u3042\u3044 (\xE3\x81\x82\xE3\x81\x84)
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* "src_len" == 2
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* "dst_len" >= 7
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* ->
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* Returned value == 6
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* "dst" becomes \xE3\x81\x82\xE3\x81\x84\0
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* (note that "dst" is null-terminated)
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*
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* Example 2
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* "src" == \u3042\u3044 (\xE3\x81\x82\xE3\x81\x84)
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* "src_len" == 2
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* "dst_len" == 5
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* ->
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* Returned value == 3
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* "dst" becomes \xE3\x81\x82\0
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* (note that "dst" is null-terminated, but \u3044 is not stored in "dst"
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* since "dst" does not have enough size to store the character)
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*
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* Example 3
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* "src" == \u3042\u3044 (\xE3\x81\x82\xE3\x81\x84)
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* "src_len" == 2
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* "dst_len" == 6
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* ->
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* Returned value == 6
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* "dst" becomes \xE3\x81\x82\xE3\x81\x84
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* (note that "dst" is NOT null-terminated, like strncpy)
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*/
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size_t utf32_to_utf8(const char32_t* src, size_t src_len,
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char* dst, size_t dst_len);
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size_t utf16_to_utf8(const char16_t* src, size_t src_len,
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char* dst, size_t dst_len);
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}
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// ---------------------------------------------------------------------------
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namespace android {
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class TextOutput;
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//! This is a string holding UTF-8 characters. Does not allow the value more
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// than 0x10FFFF, which is not valid unicode codepoint.
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class String8
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{
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public:
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String8();
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String8(const String8& o);
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explicit String8(const char* o);
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explicit String8(const char* o, size_t numChars);
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explicit String8(const String16& o);
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explicit String8(const char16_t* o);
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explicit String8(const char16_t* o, size_t numChars);
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explicit String8(const char32_t* o);
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explicit String8(const char32_t* o, size_t numChars);
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~String8();
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inline const char* string() const;
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inline size_t size() const;
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inline size_t length() const;
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inline size_t bytes() const;
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inline const SharedBuffer* sharedBuffer() const;
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void setTo(const String8& other);
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status_t setTo(const char* other);
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status_t setTo(const char* other, size_t numChars);
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status_t setTo(const char16_t* other, size_t numChars);
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status_t setTo(const char32_t* other,
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size_t length);
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status_t append(const String8& other);
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status_t append(const char* other);
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status_t append(const char* other, size_t numChars);
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status_t appendFormat(const char* fmt, ...)
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__attribute__((format (printf, 2, 3)));
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// Note that this function takes O(N) time to calculate the value.
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// No cache value is stored.
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size_t getUtf32Length() const;
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int32_t getUtf32At(size_t index,
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size_t *next_index) const;
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size_t getUtf32(char32_t* dst, size_t dst_len) const;
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inline String8& operator=(const String8& other);
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inline String8& operator=(const char* other);
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inline String8& operator+=(const String8& other);
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inline String8 operator+(const String8& other) const;
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inline String8& operator+=(const char* other);
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inline String8 operator+(const char* other) const;
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inline int compare(const String8& other) const;
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inline bool operator<(const String8& other) const;
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inline bool operator<=(const String8& other) const;
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inline bool operator==(const String8& other) const;
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inline bool operator!=(const String8& other) const;
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inline bool operator>=(const String8& other) const;
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inline bool operator>(const String8& other) const;
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inline bool operator<(const char* other) const;
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inline bool operator<=(const char* other) const;
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inline bool operator==(const char* other) const;
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inline bool operator!=(const char* other) const;
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inline bool operator>=(const char* other) const;
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inline bool operator>(const char* other) const;
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inline operator const char*() const;
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char* lockBuffer(size_t size);
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void unlockBuffer();
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status_t unlockBuffer(size_t size);
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// return the index of the first byte of other in this at or after
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// start, or -1 if not found
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ssize_t find(const char* other, size_t start = 0) const;
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void toLower();
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void toLower(size_t start, size_t numChars);
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void toUpper();
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void toUpper(size_t start, size_t numChars);
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/*
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* These methods operate on the string as if it were a path name.
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*/
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/*
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* Set the filename field to a specific value.
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*
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* Normalizes the filename, removing a trailing '/' if present.
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*/
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void setPathName(const char* name);
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void setPathName(const char* name, size_t numChars);
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/*
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* Get just the filename component.
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*
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* "/tmp/foo/bar.c" --> "bar.c"
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*/
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String8 getPathLeaf(void) const;
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/*
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* Remove the last (file name) component, leaving just the directory
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* name.
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*
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* "/tmp/foo/bar.c" --> "/tmp/foo"
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* "/tmp" --> "" // ????? shouldn't this be "/" ???? XXX
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* "bar.c" --> ""
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*/
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String8 getPathDir(void) const;
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/*
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* Retrieve the front (root dir) component. Optionally also return the
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* remaining components.
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*
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* "/tmp/foo/bar.c" --> "tmp" (remain = "foo/bar.c")
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* "/tmp" --> "tmp" (remain = "")
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* "bar.c" --> "bar.c" (remain = "")
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*/
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String8 walkPath(String8* outRemains = NULL) const;
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/*
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* Return the filename extension. This is the last '.' and up to
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* four characters that follow it. The '.' is included in case we
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* decide to expand our definition of what constitutes an extension.
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*
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* "/tmp/foo/bar.c" --> ".c"
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* "/tmp" --> ""
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* "/tmp/foo.bar/baz" --> ""
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* "foo.jpeg" --> ".jpeg"
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* "foo." --> ""
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*/
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String8 getPathExtension(void) const;
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/*
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* Return the path without the extension. Rules for what constitutes
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* an extension are described in the comment for getPathExtension().
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*
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* "/tmp/foo/bar.c" --> "/tmp/foo/bar"
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*/
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String8 getBasePath(void) const;
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/*
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* Add a component to the pathname. We guarantee that there is
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* exactly one path separator between the old path and the new.
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* If there is no existing name, we just copy the new name in.
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*
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* If leaf is a fully qualified path (i.e. starts with '/', it
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* replaces whatever was there before.
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*/
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String8& appendPath(const char* leaf);
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String8& appendPath(const String8& leaf) { return appendPath(leaf.string()); }
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/*
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* Like appendPath(), but does not affect this string. Returns a new one instead.
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*/
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String8 appendPathCopy(const char* leaf) const
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{ String8 p(*this); p.appendPath(leaf); return p; }
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String8 appendPathCopy(const String8& leaf) const { return appendPathCopy(leaf.string()); }
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/*
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* Converts all separators in this string to /, the default path separator.
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*
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* If the default OS separator is backslash, this converts all
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* backslashes to slashes, in-place. Otherwise it does nothing.
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* Returns self.
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*/
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String8& convertToResPath();
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private:
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status_t real_append(const char* other, size_t numChars);
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char* find_extension(void) const;
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const char* mString;
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};
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TextOutput& operator<<(TextOutput& to, const String16& val);
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// ---------------------------------------------------------------------------
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// No user servicable parts below.
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inline int compare_type(const String8& lhs, const String8& rhs)
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{
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return lhs.compare(rhs);
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}
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inline int strictly_order_type(const String8& lhs, const String8& rhs)
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{
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return compare_type(lhs, rhs) < 0;
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}
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inline const char* String8::string() const
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{
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return mString;
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}
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inline size_t String8::length() const
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{
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return SharedBuffer::sizeFromData(mString)-1;
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}
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inline size_t String8::size() const
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{
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return length();
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}
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inline size_t String8::bytes() const
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{
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return SharedBuffer::sizeFromData(mString)-1;
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}
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inline const SharedBuffer* String8::sharedBuffer() const
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{
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return SharedBuffer::bufferFromData(mString);
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}
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inline String8& String8::operator=(const String8& other)
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{
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setTo(other);
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return *this;
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}
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inline String8& String8::operator=(const char* other)
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{
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setTo(other);
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return *this;
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}
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inline String8& String8::operator+=(const String8& other)
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{
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append(other);
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return *this;
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}
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inline String8 String8::operator+(const String8& other) const
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{
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String8 tmp(*this);
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tmp += other;
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return tmp;
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}
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inline String8& String8::operator+=(const char* other)
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{
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append(other);
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return *this;
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}
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inline String8 String8::operator+(const char* other) const
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{
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String8 tmp(*this);
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tmp += other;
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return tmp;
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}
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inline int String8::compare(const String8& other) const
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{
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return strcmp(mString, other.mString);
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}
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inline bool String8::operator<(const String8& other) const
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{
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return strcmp(mString, other.mString) < 0;
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}
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inline bool String8::operator<=(const String8& other) const
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{
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return strcmp(mString, other.mString) <= 0;
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}
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inline bool String8::operator==(const String8& other) const
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{
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return strcmp(mString, other.mString) == 0;
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}
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inline bool String8::operator!=(const String8& other) const
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{
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return strcmp(mString, other.mString) != 0;
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}
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inline bool String8::operator>=(const String8& other) const
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{
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return strcmp(mString, other.mString) >= 0;
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}
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inline bool String8::operator>(const String8& other) const
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{
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return strcmp(mString, other.mString) > 0;
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}
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inline bool String8::operator<(const char* other) const
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{
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return strcmp(mString, other) < 0;
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}
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inline bool String8::operator<=(const char* other) const
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{
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return strcmp(mString, other) <= 0;
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}
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inline bool String8::operator==(const char* other) const
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{
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return strcmp(mString, other) == 0;
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}
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inline bool String8::operator!=(const char* other) const
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{
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return strcmp(mString, other) != 0;
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}
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inline bool String8::operator>=(const char* other) const
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{
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return strcmp(mString, other) >= 0;
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}
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inline bool String8::operator>(const char* other) const
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{
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return strcmp(mString, other) > 0;
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}
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inline String8::operator const char*() const
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{
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return mString;
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}
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} // namespace android
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// ---------------------------------------------------------------------------
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#endif // ANDROID_STRING8_H
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