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Merge \"libutils/Unicode.cpp: Correct length computation and add checks for utf16->utf8\" into nyc-dev

Browse source 
am: 757f4ef340

Change-Id: I29dfaa3968597fc3b0cdadd140b5790c1e61008d
This commit is contained in:
Sergio Giro 2016-07-14 18:08:00 +00:00 committed by android-build-merger
commit 71d9f83fa9
4 changed files with 45 additions and 18 deletions
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4
include/utils/Unicode.h
View file

@ -88,7 +88,7 @@ ssize_t utf32_to_utf8_length(const char32_t *src, size_t src_len);
* "dst" becomes \xE3\x81\x82\xE3\x81\x84
* (note that "dst" is NOT null-terminated, like strncpy)
*/
void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst);
void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst, size_t dst_len);
/**
* Returns the unicode value at "index".
@ -110,7 +110,7 @@ ssize_t utf16_to_utf8_length(const char16_t *src, size_t src_len);
* enough to fit the UTF-16 as measured by utf16_to_utf8_length with an added
* NULL terminator.
*/
void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst);
void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst, size_t dst_len);
/**
* Returns the length of "src" when "src" is valid UTF-8 string.

25
libutils/String8.cpp
View file

@ -104,20 +104,21 @@ 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) {
// Allow for closing '\0'
const ssize_t resultStrLen = utf16_to_utf8_length(in, len) + 1;
if (resultStrLen < 1) {
return getEmptyString();
}
SharedBuffer* buf = SharedBuffer::alloc(bytes+1);
SharedBuffer* buf = SharedBuffer::alloc(resultStrLen);
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;
char* resultStr = (char*)buf->data();
utf16_to_utf8(in, len, resultStr, resultStrLen);
return resultStr;
}
static char* allocFromUTF32(const char32_t* in, size_t len)
@ -126,21 +127,21 @@ static char* allocFromUTF32(const char32_t* in, size_t len)
return getEmptyString();
}
const ssize_t bytes = utf32_to_utf8_length(in, len);
if (bytes < 0) {
const ssize_t resultStrLen = utf32_to_utf8_length(in, len) + 1;
if (resultStrLen < 1) {
return getEmptyString();
}
SharedBuffer* buf = SharedBuffer::alloc(bytes+1);
SharedBuffer* buf = SharedBuffer::alloc(resultStrLen);
ALOG_ASSERT(buf, "Unable to allocate shared buffer");
if (!buf) {
return getEmptyString();
}
char* str = (char*) buf->data();
utf32_to_utf8(in, len, str);
char* resultStr = (char*) buf->data();
utf32_to_utf8(in, len, resultStr, resultStrLen);
return str;
return resultStr;
}
// ---------------------------------------------------------------------------

15
libutils/Unicode.cpp
View file

@ -14,6 +14,7 @@
* limitations under the License.
*/
#include <log/log.h>
#include <utils/Unicode.h>
#include <stddef.h>
@ -182,7 +183,7 @@ ssize_t utf32_to_utf8_length(const char32_t *src, size_t src_len)
return ret;
}
void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst)
void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst, size_t dst_len)
{
if (src == NULL || src_len == 0 || dst == NULL) {
return;
@ -193,9 +194,12 @@ void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst)
char *cur = dst;
while (cur_utf32 < end_utf32) {
size_t len = utf32_codepoint_utf8_length(*cur_utf32);
LOG_ALWAYS_FATAL_IF(dst_len < len, "%zu < %zu", dst_len, len);
utf32_codepoint_to_utf8((uint8_t *)cur, *cur_utf32++, len);
cur += len;
dst_len -= len;
}
LOG_ALWAYS_FATAL_IF(dst_len < 1, "dst_len < 1: %zu < 1", dst_len);
*cur = '\0';
}
@ -348,7 +352,7 @@ int strzcmp16_h_n(const char16_t *s1H, size_t n1, const char16_t *s2N, size_t n2
: 0);
}
void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst)
void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst, size_t dst_len)
{
if (src == NULL || src_len == 0 || dst == NULL) {
return;
@ -369,9 +373,12 @@ void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst)
utf32 = (char32_t) *cur_utf16++;
}
const size_t len = utf32_codepoint_utf8_length(utf32);
LOG_ALWAYS_FATAL_IF(dst_len < len, "%zu < %zu", dst_len, len);
utf32_codepoint_to_utf8((uint8_t*)cur, utf32, len);
cur += len;
dst_len -= len;
}
LOG_ALWAYS_FATAL_IF(dst_len < 1, "%zu < 1", dst_len);
*cur = '\0';
}
@ -432,10 +439,10 @@ ssize_t utf16_to_utf8_length(const char16_t *src, size_t src_len)
const char16_t* const end = src + src_len;
while (src < end) {
if ((*src & 0xFC00) == 0xD800 && (src + 1) < end
&& (*++src & 0xFC00) == 0xDC00) {
&& (*(src + 1) & 0xFC00) == 0xDC00) {
// surrogate pairs are always 4 bytes.
ret += 4;
src++;
src += 2;
} else {
ret += utf32_codepoint_utf8_length((char32_t) *src++);
}

19
libutils/tests/String8_test.cpp
View file

@ -17,6 +17,7 @@
#define LOG_TAG "String8_test"
#include <utils/Log.h>
#include <utils/String8.h>
#include <utils/String16.h>
#include <gtest/gtest.h>
@ -77,4 +78,22 @@ TEST_F(String8Test, SetToSizeMaxReturnsNoMemory) {
EXPECT_EQ(NO_MEMORY, String8("").setTo(in, SIZE_MAX));
}
// http://b/29250543
TEST_F(String8Test, CorrectInvalidSurrogate) {
// d841d8 is an invalid start for a surrogate pair. Make sure this is handled by ignoring the
// first character in the pair and handling the rest correctly.
String16 string16(u"\xd841\xd841\xdc41\x0000");
String8 string8(string16);
EXPECT_EQ(4U, string8.length());
}
TEST_F(String8Test, CheckUtf32Conversion) {
// Since bound checks were added, check the conversion can be done without fatal errors.
// The utf8 lengths of these are chars are 1 + 2 + 3 + 4 = 10.
const char32_t string32[] = U"\x0000007f\x000007ff\x0000911\x0010fffe";
String8 string8(string32);
EXPECT_EQ(10U, string8.length());
}
}