1 files changed, 646 insertions, 0 deletions
diff --git a/media/libstagefright/system/core/libutils/String8.cpp b/media/libstagefright/system/core/libutils/String8.cpp
new file mode 100644
index 000000000..3d4b28569
--- /dev/null
+++ b/media/libstagefright/system/core/libutils/String8.cpp
@@ -0,0 +1,646 @@
+/*
+ * 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.
+ */
+
+#include <utils/String8.h>
+
+#include <utils/Log.h>
+#include <utils/Unicode.h>
+#include <utils/SharedBuffer.h>
+#include <utils/String16.h>
+#include <utils/threads.h>
+
+#include <ctype.h>
+
+/*
+ * Functions outside android is below the namespace stagefright, since they use
+ * functions and constants in android namespace.
+ */
+
+// ---------------------------------------------------------------------------
+
+namespace stagefright {
+
+// Separator used by resource paths. This is not platform dependent contrary
+// to OS_PATH_SEPARATOR.
+#define RES_PATH_SEPARATOR '/'
+
+static SharedBuffer* gEmptyStringBuf = NULL;
+static char* gEmptyString = NULL;
+
+extern int gDarwinCantLoadAllObjects;
+int gDarwinIsReallyAnnoying;
+
+void initialize_string8();
+
+static inline char* getEmptyString()
+{
+    gEmptyStringBuf->acquire();
+    return gEmptyString;
+}
+
+void initialize_string8()
+{
+    // HACK: This dummy dependency forces linking libutils Static.cpp,
+    // which is needed to initialize String8/String16 classes.
+    // These variables are named for Darwin, but are needed elsewhere too,
+    // including static linking on any platform.
+    gDarwinIsReallyAnnoying = gDarwinCantLoadAllObjects;
+
+    SharedBuffer* buf = SharedBuffer::alloc(1);
+    char* str = (char*)buf->data();
+    *str = 0;
+    gEmptyStringBuf = buf;
+    gEmptyString = str;
+}
+
+void terminate_string8()
+{
+    SharedBuffer::bufferFromData(gEmptyString)->release();
+    gEmptyStringBuf = NULL;
+    gEmptyString = NULL;
+}
+
+// ---------------------------------------------------------------------------
+
+static char* allocFromUTF8(const char* in, size_t len)
+{
+    if (len > 0) {
+        SharedBuffer* buf = SharedBuffer::alloc(len+1);
+        ALOG_ASSERT(buf, "Unable to allocate shared buffer");
+        if (buf) {
+            char* str = (char*)buf->data();
+            memcpy(str, in, len);
+            str[len] = 0;
+            return str;
+        }
+        return NULL;
+    }
+
+    return getEmptyString();
+}
+
+static char* allocFromUTF16(const char16_t* in, size_t len)
+{
+    if (len == 0) return getEmptyString();
+
+    const ssize_t bytes = utf16_to_utf8_length(in, len);
+    if (bytes < 0) {
+        return getEmptyString();
+    }
+
+    SharedBuffer* buf = SharedBuffer::alloc(bytes+1);
+    ALOG_ASSERT(buf, "Unable to allocate shared buffer");
+    if (!buf) {
+        return getEmptyString();
+    }
+
+    char* str = (char*)buf->data();
+    utf16_to_utf8(in, len, str);
+    return str;
+}
+
+static char* allocFromUTF32(const char32_t* in, size_t len)
+{
+    if (len == 0) {
+        return getEmptyString();
+    }
+
+    const ssize_t bytes = utf32_to_utf8_length(in, len);
+    if (bytes < 0) {
+        return getEmptyString();
+    }
+
+    SharedBuffer* buf = SharedBuffer::alloc(bytes+1);
+    ALOG_ASSERT(buf, "Unable to allocate shared buffer");
+    if (!buf) {
+        return getEmptyString();
+    }
+
+    char* str = (char*) buf->data();
+    utf32_to_utf8(in, len, str);
+
+    return str;
+}
+
+// ---------------------------------------------------------------------------
+
+String8::String8()
+    : mString(0)
+{
+    char* data = static_cast<char*>(
+            SharedBuffer::alloc(sizeof(char))->data());
+    data[0] = 0;
+    mString = data;
+}
+
+String8::String8(const String8& o)
+    : mString(o.mString)
+{
+    SharedBuffer::bufferFromData(mString)->acquire();
+}
+
+String8::String8(const char* o)
+    : mString(allocFromUTF8(o, strlen(o)))
+{
+    if (mString == NULL) {
+        mString = getEmptyString();
+    }
+}
+
+String8::String8(const char* o, size_t len)
+    : mString(allocFromUTF8(o, len))
+{
+    if (mString == NULL) {
+        mString = getEmptyString();
+    }
+}
+
+String8::String8(const String16& o)
+    : mString(allocFromUTF16(o.string(), o.size()))
+{
+}
+
+String8::String8(const char16_t* o)
+    : mString(allocFromUTF16(o, strlen16(o)))
+{
+}
+
+String8::String8(const char16_t* o, size_t len)
+    : mString(allocFromUTF16(o, len))
+{
+}
+
+String8::String8(const char32_t* o)
+    : mString(allocFromUTF32(o, strlen32(o)))
+{
+}
+
+String8::String8(const char32_t* o, size_t len)
+    : mString(allocFromUTF32(o, len))
+{
+}
+
+String8::~String8()
+{
+    SharedBuffer::bufferFromData(mString)->release();
+}
+
+String8 String8::format(const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+
+    String8 result(formatV(fmt, args));
+
+    va_end(args);
+    return result;
+}
+
+String8 String8::formatV(const char* fmt, va_list args)
+{
+    String8 result;
+    result.appendFormatV(fmt, args);
+    return result;
+}
+
+void String8::clear() {
+    SharedBuffer::bufferFromData(mString)->release();
+    mString = getEmptyString();
+}
+
+void String8::setTo(const String8& other)
+{
+    SharedBuffer::bufferFromData(other.mString)->acquire();
+    SharedBuffer::bufferFromData(mString)->release();
+    mString = other.mString;
+}
+
+status_t String8::setTo(const char* other)
+{
+    const char *newString = allocFromUTF8(other, strlen(other));
+    SharedBuffer::bufferFromData(mString)->release();
+    mString = newString;
+    if (mString) return NO_ERROR;
+
+    mString = getEmptyString();
+    return NO_MEMORY;
+}
+
+status_t String8::setTo(const char* other, size_t len)
+{
+    const char *newString = allocFromUTF8(other, len);
+    SharedBuffer::bufferFromData(mString)->release();
+    mString = newString;
+    if (mString) return NO_ERROR;
+
+    mString = getEmptyString();
+    return NO_MEMORY;
+}
+
+status_t String8::setTo(const char16_t* other, size_t len)
+{
+    const char *newString = allocFromUTF16(other, len);
+    SharedBuffer::bufferFromData(mString)->release();
+    mString = newString;
+    if (mString) return NO_ERROR;
+
+    mString = getEmptyString();
+    return NO_MEMORY;
+}
+
+status_t String8::setTo(const char32_t* other, size_t len)
+{
+    const char *newString = allocFromUTF32(other, len);
+    SharedBuffer::bufferFromData(mString)->release();
+    mString = newString;
+    if (mString) return NO_ERROR;
+
+    mString = getEmptyString();
+    return NO_MEMORY;
+}
+
+status_t String8::append(const String8& other)
+{
+    const size_t otherLen = other.bytes();
+    if (bytes() == 0) {
+        setTo(other);
+        return NO_ERROR;
+    } else if (otherLen == 0) {
+        return NO_ERROR;
+    }
+
+    return real_append(other.string(), otherLen);
+}
+
+status_t String8::append(const char* other)
+{
+    return append(other, strlen(other));
+}
+
+status_t String8::append(const char* other, size_t otherLen)
+{
+    if (bytes() == 0) {
+        return setTo(other, otherLen);
+    } else if (otherLen == 0) {
+        return NO_ERROR;
+    }
+
+    return real_append(other, otherLen);
+}
+
+status_t String8::appendFormat(const char* fmt, ...)
+{
+    va_list args;
+    va_start(args, fmt);
+
+    status_t result = appendFormatV(fmt, args);
+
+    va_end(args);
+    return result;
+}
+
+status_t String8::appendFormatV(const char* fmt, va_list args)
+{
+    int result = NO_ERROR;
+#ifndef _MSC_VER
+    va_list o;
+    va_copy(o, args);
+#endif
+    int n = vsnprintf(NULL, 0, fmt, args);
+    if (n != 0) {
+        size_t oldLength = length();
+        char* buf = lockBuffer(oldLength + n);
+        if (buf) {
+#ifdef _MSC_VER
+            vsnprintf(buf + oldLength, n + 1, fmt, args);
+#else
+            vsnprintf(buf + oldLength, n + 1, fmt, o);
+#endif
+        } else {
+            result = NO_MEMORY;
+        }
+    }
+#ifndef _MSC_VER
+    va_end(o);
+#endif
+    return result;
+}
+
+status_t String8::real_append(const char* other, size_t otherLen)
+{
+    const size_t myLen = bytes();
+    
+    SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
+        ->editResize(myLen+otherLen+1);
+    if (buf) {
+        char* str = (char*)buf->data();
+        mString = str;
+        str += myLen;
+        memcpy(str, other, otherLen);
+        str[otherLen] = '\0';
+        return NO_ERROR;
+    }
+    return NO_MEMORY;
+}
+
+char* String8::lockBuffer(size_t size)
+{
+    SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
+        ->editResize(size+1);
+    if (buf) {
+        char* str = (char*)buf->data();
+        mString = str;
+        return str;
+    }
+    return NULL;
+}
+
+void String8::unlockBuffer()
+{
+    unlockBuffer(strlen(mString));
+}
+
+status_t String8::unlockBuffer(size_t size)
+{
+    if (size != this->size()) {
+        SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
+            ->editResize(size+1);
+        if (! buf) {
+            return NO_MEMORY;
+        }
+
+        char* str = (char*)buf->data();
+        str[size] = 0;
+        mString = str;
+    }
+
+    return NO_ERROR;
+}
+
+ssize_t String8::find(const char* other, size_t start) const
+{
+    size_t len = size();
+    if (start >= len) {
+        return -1;
+    }
+    const char* s = mString+start;
+    const char* p = strstr(s, other);
+    return p ? p-mString : -1;
+}
+
+void String8::toLower()
+{
+    toLower(0, size());
+}
+
+void String8::toLower(size_t start, size_t length)
+{
+    const size_t len = size();
+    if (start >= len) {
+        return;
+    }
+    if (start+length > len) {
+        length = len-start;
+    }
+    char* buf = lockBuffer(len);
+    buf += start;
+    while (length > 0) {
+        *buf = tolower(*buf);
+        buf++;
+        length--;
+    }
+    unlockBuffer(len);
+}
+
+void String8::toUpper()
+{
+    toUpper(0, size());
+}
+
+void String8::toUpper(size_t start, size_t length)
+{
+    const size_t len = size();
+    if (start >= len) {
+        return;
+    }
+    if (start+length > len) {
+        length = len-start;
+    }
+    char* buf = lockBuffer(len);
+    buf += start;
+    while (length > 0) {
+        *buf = toupper(*buf);
+        buf++;
+        length--;
+    }
+    unlockBuffer(len);
+}
+
+size_t String8::getUtf32Length() const
+{
+    return utf8_to_utf32_length(mString, length());
+}
+
+int32_t String8::getUtf32At(size_t index, size_t *next_index) const
+{
+    return utf32_from_utf8_at(mString, length(), index, next_index);
+}
+
+void String8::getUtf32(char32_t* dst) const
+{
+    utf8_to_utf32(mString, length(), dst);
+}
+
+// ---------------------------------------------------------------------------
+// Path functions
+
+#if 0
+
+void String8::setPathName(const char* name)
+{
+    setPathName(name, strlen(name));
+}
+
+void String8::setPathName(const char* name, size_t len)
+{
+    char* buf = lockBuffer(len);
+
+    memcpy(buf, name, len);
+
+    // remove trailing path separator, if present
+    if (len > 0 && buf[len-1] == OS_PATH_SEPARATOR)
+        len--;
+
+    buf[len] = '\0';
+
+    unlockBuffer(len);
+}
+
+String8 String8::getPathLeaf(void) const
+{
+    const char* cp;
+    const char*const buf = mString;
+
+    cp = strrchr(buf, OS_PATH_SEPARATOR);
+    if (cp == NULL)
+        return String8(*this);
+    else
+        return String8(cp+1);
+}
+
+String8 String8::getPathDir(void) const
+{
+    const char* cp;
+    const char*const str = mString;
+
+    cp = strrchr(str, OS_PATH_SEPARATOR);
+    if (cp == NULL)
+        return String8("");
+    else
+        return String8(str, cp - str);
+}
+
+String8 String8::walkPath(String8* outRemains) const
+{
+    const char* cp;
+    const char*const str = mString;
+    const char* buf = str;
+
+    cp = strchr(buf, OS_PATH_SEPARATOR);
+    if (cp == buf) {
+        // don't include a leading '/'.
+        buf = buf+1;
+        cp = strchr(buf, OS_PATH_SEPARATOR);
+    }
+
+    if (cp == NULL) {
+        String8 res = buf != str ? String8(buf) : *this;
+        if (outRemains) *outRemains = String8("");
+        return res;
+    }
+
+    String8 res(buf, cp-buf);
+    if (outRemains) *outRemains = String8(cp+1);
+    return res;
+}
+
+/*
+ * Helper function for finding the start of an extension in a pathname.
+ *
+ * Returns a pointer inside mString, or NULL if no extension was found.
+ */
+char* String8::find_extension(void) const
+{
+    const char* lastSlash;
+    const char* lastDot;
+    int extLen;
+    const char* const str = mString;
+
+    // only look at the filename
+    lastSlash = strrchr(str, OS_PATH_SEPARATOR);
+    if (lastSlash == NULL)
+        lastSlash = str;
+    else
+        lastSlash++;
+
+    // find the last dot
+    lastDot = strrchr(lastSlash, '.');
+    if (lastDot == NULL)
+        return NULL;
+
+    // looks good, ship it
+    return const_cast<char*>(lastDot);
+}
+
+String8 String8::getPathExtension(void) const
+{
+    char* ext;
+
+    ext = find_extension();
+    if (ext != NULL)
+        return String8(ext);
+    else
+        return String8("");
+}
+
+String8 String8::getBasePath(void) const
+{
+    char* ext;
+    const char* const str = mString;
+
+    ext = find_extension();
+    if (ext == NULL)
+        return String8(*this);
+    else
+        return String8(str, ext - str);
+}
+
+String8& String8::appendPath(const char* name)
+{
+    // TODO: The test below will fail for Win32 paths. Fix later or ignore.
+    if (name[0] != OS_PATH_SEPARATOR) {
+        if (*name == '\0') {
+            // nothing to do
+            return *this;
+        }
+
+        size_t len = length();
+        if (len == 0) {
+            // no existing filename, just use the new one
+            setPathName(name);
+            return *this;
+        }
+
+        // make room for oldPath + '/' + newPath
+        int newlen = strlen(name);
+
+        char* buf = lockBuffer(len+1+newlen);
+
+        // insert a '/' if needed
+        if (buf[len-1] != OS_PATH_SEPARATOR)
+            buf[len++] = OS_PATH_SEPARATOR;
+
+        memcpy(buf+len, name, newlen+1);
+        len += newlen;
+
+        unlockBuffer(len);
+
+        return *this;
+    } else {
+        setPathName(name);
+        return *this;
+    }
+}
+
+String8& String8::convertToResPath()
+{
+#if OS_PATH_SEPARATOR != RES_PATH_SEPARATOR
+    size_t len = length();
+    if (len > 0) {
+        char * buf = lockBuffer(len);
+        for (char * end = buf + len; buf < end; ++buf) {
+            if (*buf == OS_PATH_SEPARATOR)
+                *buf = RES_PATH_SEPARATOR;
+        }
+        unlockBuffer(len);
+    }
+#endif
+    return *this;
+}
+
+#endif
+
+}; // namespace stagefright