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 /*

  * Copyright (C) 2005 The Android Open Source Project

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *      http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 #ifndef ANDROID_STRING8_H

 #define ANDROID_STRING8_H

 #include <utils/Errors.h>

 // Need this for the char16_t type; String8.h should not

 // be depedent on the String16 class.

 #include <utils/String16.h>

 #include <stdint.h>

 #include <string.h>

 #include <sys/types.h>

 // ---------------------------------------------------------------------------

 extern "C" {

 #if !defined(__cplusplus) || __cplusplus == 199711L // C or C++98

 typedef uint32_t char32_t;

 #endif

 size_t strlen32(const char32_t *);

 size_t strnlen32(const char32_t *, size_t);

 /*

  * Returns the length of "src" when "src" is valid UTF-8 string.

  * Returns 0 if src is NULL, 0-length string or non UTF-8 string.

  * This function should be used to determine whether "src" is valid UTF-8

  * characters with valid unicode codepoints. "src" must be null-terminated.

  *

  * If you are going to use other GetUtf... functions defined in this header

  * with string which may not be valid UTF-8 with valid codepoint (form 0 to

  * 0x10FFFF), you should use this function before calling others, since the

  * other functions do not check whether the string is valid UTF-8 or not.

  *

  * If you do not care whether "src" is valid UTF-8 or not, you should use

  * strlen() as usual, which should be much faster.

  */

 size_t utf8_length(const char *src);

 /*

  * Returns the UTF-32 length of "src".

  */

 size_t utf32_length(const char *src, size_t src_len);

 /*

  * Returns the UTF-8 length of "src".

  */

 size_t utf8_length_from_utf16(const char16_t *src, size_t src_len);

 /*

  * Returns the UTF-8 length of "src".

  */

 size_t utf8_length_from_utf32(const char32_t *src, size_t src_len);

 /*

  * Returns the unicode value at "index".

  * Returns -1 when the index is invalid (equals to or more than "src_len").

  * If returned value is positive, it is able to be converted to char32_t, which

  * is unsigned. Then, if "next_index" is not NULL, the next index to be used is

  * stored in "next_index". "next_index" can be NULL.

  */

 int32_t utf32_at(const char *src, size_t src_len,

                  size_t index, size_t *next_index);

 /*

  * Stores a UTF-32 string converted from "src" in "dst", if "dst_length" is not

  * large enough to store the string, the part of the "src" string is stored

  * into "dst".

  * Returns the size actually used for storing the string.

  * "dst" is not null-terminated when dst_len is fully used (like strncpy).

  */

 size_t utf8_to_utf32(const char* src, size_t src_len,

                      char32_t* dst, size_t dst_len);

 /*

  * Stores a UTF-8 string converted from "src" in "dst", if "dst_length" is not

  * large enough to store the string, the part of the "src" string is stored

  * into "dst" as much as possible. See the examples for more detail.

  * Returns the size actually used for storing the string.

  * dst" is not null-terminated when dst_len is fully used (like strncpy).

  *

  * Example 1

  * "src" == \u3042\u3044 (\xE3\x81\x82\xE3\x81\x84)

  * "src_len" == 2

  * "dst_len" >= 7

  * ->

  * Returned value == 6

  * "dst" becomes \xE3\x81\x82\xE3\x81\x84\0

  * (note that "dst" is null-terminated)

  *

  * Example 2

  * "src" == \u3042\u3044 (\xE3\x81\x82\xE3\x81\x84)

  * "src_len" == 2

  * "dst_len" == 5

  * ->

  * Returned value == 3

  * "dst" becomes \xE3\x81\x82\0

  * (note that "dst" is null-terminated, but \u3044 is not stored in "dst"

  * since "dst" does not have enough size to store the character)

  *

  * Example 3

  * "src" == \u3042\u3044 (\xE3\x81\x82\xE3\x81\x84)

  * "src_len" == 2

  * "dst_len" == 6

  * ->

  * Returned value == 6

  * "dst" becomes \xE3\x81\x82\xE3\x81\x84

  * (note that "dst" is NOT null-terminated, like strncpy)

  */

 size_t utf32_to_utf8(const char32_t* src, size_t src_len,

                      char* dst, size_t dst_len);

 size_t utf16_to_utf8(const char16_t* src, size_t src_len,

                      char* dst, size_t dst_len);

 }

 // ---------------------------------------------------------------------------

 namespace android {

 class TextOutput;

 //! This is a string holding UTF-8 characters. Does not allow the value more

 // than 0x10FFFF, which is not valid unicode codepoint.

 class String8

 {

 public:

                                 String8();

                                 String8(const String8& o);

     explicit                    String8(const char* o);

     explicit                    String8(const char* o, size_t numChars);

     explicit                    String8(const String16& o);

     explicit                    String8(const char16_t* o);

     explicit                    String8(const char16_t* o, size_t numChars);

     explicit                    String8(const char32_t* o);

     explicit                    String8(const char32_t* o, size_t numChars);

                                 ~String8();

     inline  const char*         string() const;

     inline  size_t              size() const;

     inline  size_t              length() const;

     inline  size_t              bytes() const;

     inline  const SharedBuffer* sharedBuffer() const;

             void                setTo(const String8& other);

             status_t            setTo(const char* other);

             status_t            setTo(const char* other, size_t numChars);

             status_t            setTo(const char16_t* other, size_t numChars);

             status_t            setTo(const char32_t* other,

                                       size_t length);

             status_t            append(const String8& other);

             status_t            append(const char* other);

             status_t            append(const char* other, size_t numChars);

             // Note that this function takes O(N) time to calculate the value.

             // No cache value is stored.

             size_t              getUtf32Length() const;

             int32_t             getUtf32At(size_t index,

                                            size_t *next_index) const;

             size_t              getUtf32(char32_t* dst, size_t dst_len) const;

     inline  String8&            operator=(const String8& other);

     inline  String8&            operator=(const char* other);

     inline  String8&            operator+=(const String8& other);

     inline  String8             operator+(const String8& other) const;

     inline  String8&            operator+=(const char* other);

     inline  String8             operator+(const char* other) const;

     inline  int                 compare(const String8& other) const;

     inline  bool                operator<(const String8& other) const;

     inline  bool                operator<=(const String8& other) const;

     inline  bool                operator==(const String8& other) const;

     inline  bool                operator!=(const String8& other) const;

     inline  bool                operator>=(const String8& other) const;

     inline  bool                operator>(const String8& other) const;

     inline  bool                operator<(const char* other) const;

     inline  bool                operator<=(const char* other) const;

     inline  bool                operator==(const char* other) const;

     inline  bool                operator!=(const char* other) const;

     inline  bool                operator>=(const char* other) const;

     inline  bool                operator>(const char* other) const;

     inline                      operator const char*() const;

             char*               lockBuffer(size_t size);

             void                unlockBuffer();

             status_t            unlockBuffer(size_t size);

             // return the index of the first byte of other in this at or after

             // start, or -1 if not found

             ssize_t             find(const char* other, size_t start = 0) const;

             void                toLower();

             void                toLower(size_t start, size_t numChars);

             void                toUpper();

             void                toUpper(size_t start, size_t numChars);

     /*

      * These methods operate on the string as if it were a path name.

      */

     /*

      * Set the filename field to a specific value.

      *

      * Normalizes the filename, removing a trailing '/' if present.

      */

     void setPathName(const char* name);

     void setPathName(const char* name, size_t numChars);

     /*

      * Get just the filename component.

      *

      * "/tmp/foo/bar.c" --> "bar.c"

      */

     String8 getPathLeaf(void) const;

     /*

      * Remove the last (file name) component, leaving just the directory

      * name.

      *

      * "/tmp/foo/bar.c" --> "/tmp/foo"

      * "/tmp" --> "" // ????? shouldn't this be "/" ???? XXX

      * "bar.c" --> ""

      */

     String8 getPathDir(void) const;

     /*

      * Retrieve the front (root dir) component.  Optionally also return the

      * remaining components.

      *

      * "/tmp/foo/bar.c" --> "tmp" (remain = "foo/bar.c")

      * "/tmp" --> "tmp" (remain = "")

      * "bar.c" --> "bar.c" (remain = "")

      */

     String8 walkPath(String8* outRemains = NULL) const;

     /*

      * Return the filename extension.  This is the last '.' and up to

      * four characters that follow it.  The '.' is included in case we

      * decide to expand our definition of what constitutes an extension.

      *

      * "/tmp/foo/bar.c" --> ".c"

      * "/tmp" --> ""

      * "/tmp/foo.bar/baz" --> ""

      * "foo.jpeg" --> ".jpeg"

      * "foo." --> ""

      */

     String8 getPathExtension(void) const;

     /*

      * Return the path without the extension.  Rules for what constitutes

      * an extension are described in the comment for getPathExtension().

      *

      * "/tmp/foo/bar.c" --> "/tmp/foo/bar"

      */

     String8 getBasePath(void) const;

     /*

      * Add a component to the pathname.  We guarantee that there is

      * exactly one path separator between the old path and the new.

      * If there is no existing name, we just copy the new name in.

      *

      * If leaf is a fully qualified path (i.e. starts with '/', it

      * replaces whatever was there before.

      */

     String8& appendPath(const char* leaf);

     String8& appendPath(const String8& leaf)  { return appendPath(leaf.string()); }

     /*

      * Like appendPath(), but does not affect this string.  Returns a new one instead.

      */

     String8 appendPathCopy(const char* leaf) const

                                              { String8 p(*this); p.appendPath(leaf); return p; }

     String8 appendPathCopy(const String8& leaf) const { return appendPathCopy(leaf.string()); }

     /*

      * Converts all separators in this string to /, the default path separator.

      *

      * If the default OS separator is backslash, this converts all

      * backslashes to slashes, in-place. Otherwise it does nothing.

      * Returns self.

      */

     String8& convertToResPath();

 private:

             status_t            real_append(const char* other, size_t numChars);

             char*               find_extension(void) const;

             const char* mString;

 };

 TextOutput& operator<<(TextOutput& to, const String16& val);

 // ---------------------------------------------------------------------------

 // No user servicable parts below.

 inline int compare_type(const String8& lhs, const String8& rhs)

 {

     return lhs.compare(rhs);

 }

 inline int strictly_order_type(const String8& lhs, const String8& rhs)

 {

     return compare_type(lhs, rhs) < 0;

 }

 inline const char* String8::string() const

 {

     return mString;

 }

 inline size_t String8::length() const

 {

     return SharedBuffer::sizeFromData(mString)-1;

 }

 inline size_t String8::size() const

 {

     return length();

 }

 inline size_t String8::bytes() const

 {

     return SharedBuffer::sizeFromData(mString)-1;

 }

 inline const SharedBuffer* String8::sharedBuffer() const

 {

     return SharedBuffer::bufferFromData(mString);

 }

 inline String8& String8::operator=(const String8& other)

 {

     setTo(other);

     return *this;

 }

 inline String8& String8::operator=(const char* other)

 {

     setTo(other);

     return *this;

 }

 inline String8& String8::operator+=(const String8& other)

 {

     append(other);

     return *this;

 }

 inline String8 String8::operator+(const String8& other) const

 {

     String8 tmp;

     tmp += other;

     return tmp;

 }

 inline String8& String8::operator+=(const char* other)

 {

     append(other);

     return *this;

 }

 inline String8 String8::operator+(const char* other) const

 {

     String8 tmp;

     tmp += other;

     return tmp;

 }

 inline int String8::compare(const String8& other) const

 {

     return strcmp(mString, other.mString);

 }

 inline bool String8::operator<(const String8& other) const

 {

     return strcmp(mString, other.mString) < 0;

 }

 inline bool String8::operator<=(const String8& other) const

 {

     return strcmp(mString, other.mString) <= 0;

 }

 inline bool String8::operator==(const String8& other) const

 {

     return strcmp(mString, other.mString) == 0;

 }

 inline bool String8::operator!=(const String8& other) const

 {

     return strcmp(mString, other.mString) != 0;

 }

 inline bool String8::operator>=(const String8& other) const

 {

     return strcmp(mString, other.mString) >= 0;

 }

 inline bool String8::operator>(const String8& other) const

 {

     return strcmp(mString, other.mString) > 0;

 }

 inline bool String8::operator<(const char* other) const

 {

     return strcmp(mString, other) < 0;

 }

 inline bool String8::operator<=(const char* other) const

 {

     return strcmp(mString, other) <= 0;

 }

 inline bool String8::operator==(const char* other) const

 {

     return strcmp(mString, other) == 0;

 }

 inline bool String8::operator!=(const char* other) const

 {

     return strcmp(mString, other) != 0;

 }

 inline bool String8::operator>=(const char* other) const

 {

     return strcmp(mString, other) >= 0;

 }

 inline bool String8::operator>(const char* other) const

 {

     return strcmp(mString, other) > 0;

 }

 inline String8::operator const char*() const

 {

     return mString;

 }

 }  // namespace android

 // ---------------------------------------------------------------------------

 #endif // ANDROID_STRING8_H