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-rw-r--r--LibOVR/Src/Kernel/OVR_UTF8Util.cpp556
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diff --git a/LibOVR/Src/Kernel/OVR_UTF8Util.cpp b/LibOVR/Src/Kernel/OVR_UTF8Util.cpp
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-/**************************************************************************
-
-Filename : OVR_UTF8Util.cpp
-Content : UTF8 Unicode character encoding/decoding support
-Created : September 19, 2012
-Notes :
-Notes : Much useful info at "UTF-8 and Unicode FAQ"
- http://www.cl.cam.ac.uk/~mgk25/unicode.html
-
-Copyright : Copyright 2014 Oculus VR, LLC All Rights reserved.
-
-Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License");
-you may not use the Oculus VR Rift SDK except in compliance with the License,
-which is provided at the time of installation or download, or which
-otherwise accompanies this software in either electronic or hard copy form.
-
-You may obtain a copy of the License at
-
-http://www.oculusvr.com/licenses/LICENSE-3.2
-
-Unless required by applicable law or agreed to in writing, the Oculus VR SDK
-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 "OVR_UTF8Util.h"
-
-namespace OVR { namespace UTF8Util {
-
-intptr_t OVR_STDCALL GetLength(const char* buf, intptr_t buflen)
-{
- const char* p = buf;
- intptr_t length = 0;
-
- if (buflen != -1)
- {
- while (p - buf < buflen)
- {
- // We should be able to have ASStrings with 0 in the middle.
- UTF8Util::DecodeNextChar_Advance0(&p);
- length++;
- }
- }
- else
- {
- while (UTF8Util::DecodeNextChar_Advance0(&p))
- length++;
- }
-
- return length;
-}
-
-uint32_t OVR_STDCALL GetCharAt(intptr_t index, const char* putf8str, intptr_t length)
-{
- const char* buf = putf8str;
- uint32_t c = 0;
-
- if (length != -1)
- {
- while (buf - putf8str < length)
- {
- c = UTF8Util::DecodeNextChar_Advance0(&buf);
- if (index == 0)
- return c;
- index--;
- }
-
- return c;
- }
-
- do
- {
- c = UTF8Util::DecodeNextChar_Advance0(&buf);
- index--;
-
- if (c == 0)
- {
- // We've hit the end of the string; don't go further.
- OVR_ASSERT(index == 0);
- return c;
- }
- } while (index >= 0);
-
- return c;
-}
-
-intptr_t OVR_STDCALL GetByteIndex(intptr_t index, const char *putf8str, intptr_t length)
-{
- const char* buf = putf8str;
-
- if (length != -1)
- {
- while ((buf - putf8str) < length && index > 0)
- {
- UTF8Util::DecodeNextChar_Advance0(&buf);
- index--;
- }
-
- return buf-putf8str;
- }
-
- while (index > 0)
- {
- uint32_t c = UTF8Util::DecodeNextChar_Advance0(&buf);
- index--;
-
- if (c == 0)
- return buf-putf8str;
- };
-
- return buf-putf8str;
-}
-
-int OVR_STDCALL GetEncodeCharSize(uint32_t ucs_character)
-{
- if (ucs_character <= 0x7F)
- return 1;
- else if (ucs_character <= 0x7FF)
- return 2;
- else if (ucs_character <= 0xFFFF)
- return 3;
- else if (ucs_character <= 0x1FFFFF)
- return 4;
- else if (ucs_character <= 0x3FFFFFF)
- return 5;
- else if (ucs_character <= 0x7FFFFFFF)
- return 6;
- else
- return 0;
-}
-
-uint32_t OVR_STDCALL DecodeNextChar_Advance0(const char** putf8Buffer)
-{
- uint32_t uc;
- char c;
-
- // Security considerations:
- //
- // Changed, this is now only the case for DecodeNextChar:
- // - If we hit a zero byte, we want to return 0 without stepping
- // the buffer pointer past the 0. th
- //
- // If we hit an "overlong sequence"; i.e. a character encoded
- // in a longer multibyte string than is necessary, then we
- // need to discard the character. This is so attackers can't
- // disguise dangerous characters or character sequences --
- // there is only one valid encoding for each character.
- //
- // If we decode characters { 0xD800 .. 0xDFFF } or { 0xFFFE,
- // 0xFFFF } then we ignore them; they are not valid in UTF-8.
-
- // This isn't actually an invalid character; it's a valid char that
- // looks like an inverted question mark.
-#define INVALID_CHAR 0x0FFFD
-
-#define FIRST_BYTE(mask, shift) \
- uc = (c & (mask)) << (shift);
-
-#define NEXT_BYTE(shift) \
- c = **putf8Buffer; \
- if (c == 0) return 0; /* end of buffer, do not advance */ \
- if ((c & 0xC0) != 0x80) return INVALID_CHAR; /* standard check */ \
- (*putf8Buffer)++; \
- uc |= (c & 0x3F) << shift;
-
- c = **putf8Buffer;
- (*putf8Buffer)++;
- if (c == 0)
- return 0; // End of buffer.
-
- if ((c & 0x80) == 0) return (uint32_t) c; // Conventional 7-bit ASCII.
-
- // Multi-byte sequences.
- if ((c & 0xE0) == 0xC0)
- {
- // Two-byte sequence.
- FIRST_BYTE(0x1F, 6);
- NEXT_BYTE(0);
- if (uc < 0x80) return INVALID_CHAR; // overlong
- return uc;
- }
- else if ((c & 0xF0) == 0xE0)
- {
- // Three-byte sequence.
- FIRST_BYTE(0x0F, 12);
- NEXT_BYTE(6);
- NEXT_BYTE(0);
- if (uc < 0x800) return INVALID_CHAR; // overlong
- // Not valid ISO 10646, but Flash requires these to work
- // see AS3 test e15_5_3_2_3 for String.fromCharCode().charCodeAt(0)
- // if (uc >= 0x0D800 && uc <= 0x0DFFF) return INVALID_CHAR;
- // if (uc == 0x0FFFE || uc == 0x0FFFF) return INVALID_CHAR; // not valid ISO 10646
- return uc;
- }
- else if ((c & 0xF8) == 0xF0)
- {
- // Four-byte sequence.
- FIRST_BYTE(0x07, 18);
- NEXT_BYTE(12);
- NEXT_BYTE(6);
- NEXT_BYTE(0);
- if (uc < 0x010000) return INVALID_CHAR; // overlong
- return uc;
- }
- else if ((c & 0xFC) == 0xF8)
- {
- // Five-byte sequence.
- FIRST_BYTE(0x03, 24);
- NEXT_BYTE(18);
- NEXT_BYTE(12);
- NEXT_BYTE(6);
- NEXT_BYTE(0);
- if (uc < 0x0200000) return INVALID_CHAR; // overlong
- return uc;
- }
- else if ((c & 0xFE) == 0xFC)
- {
- // Six-byte sequence.
- FIRST_BYTE(0x01, 30);
- NEXT_BYTE(24);
- NEXT_BYTE(18);
- NEXT_BYTE(12);
- NEXT_BYTE(6);
- NEXT_BYTE(0);
- if (uc < 0x04000000) return INVALID_CHAR; // overlong
- return uc;
- }
- else
- {
- // Invalid.
- return INVALID_CHAR;
- }
-}
-
-
-void OVR_STDCALL EncodeChar(char* pbuffer, intptr_t* pindex, uint32_t ucs_character)
-{
- if (ucs_character <= 0x7F)
- {
- // Plain single-byte ASCII.
- pbuffer[(*pindex)++] = (char) ucs_character;
- }
- else if (ucs_character <= 0x7FF)
- {
- // Two bytes.
- pbuffer[(*pindex)++] = 0xC0 | (char)(ucs_character >> 6);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 0) & 0x3F);
- }
- else if (ucs_character <= 0xFFFF)
- {
- // Three bytes.
- pbuffer[(*pindex)++] = 0xE0 | (char)(ucs_character >> 12);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 6) & 0x3F);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 0) & 0x3F);
- }
- else if (ucs_character <= 0x1FFFFF)
- {
- // Four bytes.
- pbuffer[(*pindex)++] = 0xF0 | (char)(ucs_character >> 18);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 12) & 0x3F);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 6) & 0x3F);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 0) & 0x3F);
- }
- else if (ucs_character <= 0x3FFFFFF)
- {
- // Five bytes.
- pbuffer[(*pindex)++] = 0xF8 | (char)(ucs_character >> 24);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 18) & 0x3F);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 12) & 0x3F);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 6) & 0x3F);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 0) & 0x3F);
- }
- else if (ucs_character <= 0x7FFFFFFF)
- {
- // Six bytes.
- pbuffer[(*pindex)++] = 0xFC | (char)(ucs_character >> 30);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 24) & 0x3F);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 18) & 0x3F);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 12) & 0x3F);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 6) & 0x3F);
- pbuffer[(*pindex)++] = 0x80 | (char)((ucs_character >> 0) & 0x3F);
- }
- else
- {
- // Invalid char; don't encode anything.
- }
-}
-
-intptr_t OVR_STDCALL GetEncodeStringSize(const wchar_t* pchar, intptr_t length)
-{
- intptr_t len = 0;
- if (length != -1)
- for (int i = 0; i < length; i++)
- {
- len += GetEncodeCharSize(pchar[i]);
- }
- else
- for (int i = 0;; i++)
- {
- if (pchar[i] == 0)
- return len;
- len += GetEncodeCharSize(pchar[i]);
- }
- return len;
-}
-
-void OVR_STDCALL EncodeString(char *pbuff, const wchar_t* pchar, intptr_t length)
-{
- intptr_t ofs = 0;
- if (length != -1)
- {
- for (int i = 0; i < length; i++)
- {
- EncodeChar(pbuff, &ofs, pchar[i]);
- }
- }
- else
- {
- for (int i = 0;; i++)
- {
- if (pchar[i] == 0)
- break;
- EncodeChar(pbuff, &ofs, pchar[i]);
- }
- }
- pbuff[ofs] = 0;
-}
-
-size_t OVR_STDCALL DecodeString(wchar_t *pbuff, const char* putf8str, intptr_t bytesLen)
-{
- wchar_t *pbegin = pbuff;
- if (bytesLen == -1)
- {
- while (1)
- {
- uint32_t ch = DecodeNextChar_Advance0(&putf8str);
- if (ch == 0)
- break;
- else if (ch >= 0xFFFF)
- ch = 0xFFFD;
- *pbuff++ = wchar_t(ch);
- }
- }
- else
- {
- const char* p = putf8str;
- while ((p - putf8str) < bytesLen)
- {
- uint32_t ch = DecodeNextChar_Advance0(&p);
- if (ch >= 0xFFFF)
- ch = 0xFFFD;
- *pbuff++ = wchar_t(ch);
- }
- }
-
- *pbuff = 0;
- return pbuff - pbegin;
-}
-
-
-#ifdef UTF8_UNIT_TEST
-
-// Compile this test case with something like:
-//
-// gcc utf8.cpp -g -I.. -DUTF8_UNIT_TEST -lstdc++ -o utf8_test
-//
-// or
-//
-// cl utf8.cpp -Zi -Od -DUTF8_UNIT_TEST -I..
-//
-// If possible, try running the test program with the first arg
-// pointing at the file:
-//
-// http://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-test.txt
-//
-// and examine the results by eye to make sure they are acceptable to
-// you.
-
-
-#include "base/utility.h"
-#include <stdio.h>
-
-
-bool check_equal(const char* utf8_in, const uint32_t* ucs_in)
-{
- for (;;)
- {
- uint32_t next_ucs = *ucs_in++;
- uint32_t next_ucs_from_utf8 = utf8::decode_next_unicode_character(&utf8_in);
- if (next_ucs != next_ucs_from_utf8)
- {
- return false;
- }
- if (next_ucs == 0)
- {
- OVR_ASSERT(next_ucs_from_utf8 == 0);
- break;
- }
- }
-
- return true;
-}
-
-
-void log_ascii(const char* line)
-{
- for (;;)
- {
- unsigned char c = (unsigned char) *line++;
- if (c == 0)
- {
- // End of line.
- return;
- }
- else if (c != '\n'
- && (c < 32 || c > 127))
- {
- // Non-printable as plain ASCII.
- printf("<0x%02X>", (int) c);
- }
- else
- {
- printf("%c", c);
- }
- }
-}
-
-
-void log_ucs(const uint32_t* line)
-{
- for (;;)
- {
- uint32_t uc = *line++;
- if (uc == 0)
- {
- // End of line.
- return;
- }
- else if (uc != '\n'
- && (uc < 32 || uc > 127))
- {
- // Non-printable as plain ASCII.
- printf("<U-%04X>", uc);
- }
- else
- {
- printf("%c", (char) uc);
- }
- }
-}
-
-
-// Simple canned test.
-int main(int argc, const char* argv[])
-{
- {
- const char* test8 = "Ignacio Castaño";
- const uint32_t test32[] =
- {
- 0x49, 0x67, 0x6E, 0x61, 0x63,
- 0x69, 0x6F, 0x20, 0x43, 0x61,
- 0x73, 0x74, 0x61, 0xF1, 0x6F,
- 0x00
- };
-
- OVR_ASSERT(check_equal(test8, test32));
- }
-
- // If user passed an arg, try reading the file as UTF-8 encoded text.
- if (argc > 1)
- {
- const char* filename = argv[1];
- FILE* fp = fopen(filename, "rb");
- if (fp == NULL)
- {
- printf("Can't open file '%s'\n", filename);
- return 1;
- }
-
- // Read lines from the file, encode/decode them, and highlight discrepancies.
- const int LINE_SIZE = 200; // max line size
- char line_buffer_utf8[LINE_SIZE];
- char reencoded_utf8[6 * LINE_SIZE];
- uint32_t line_buffer_ucs[LINE_SIZE];
-
- int byte_counter = 0;
- for (;;)
- {
- int c = fgetc(fp);
- if (c == EOF)
- {
- // Done.
- break;
- }
- line_buffer_utf8[byte_counter++] = c;
- if (c == '\n' || byte_counter >= LINE_SIZE - 2)
- {
- // End of line. Process the line.
- line_buffer_utf8[byte_counter++] = 0; // terminate.
-
- // Decode into UCS.
- const char* p = line_buffer_utf8;
- uint32_t* q = line_buffer_ucs;
- for (;;)
- {
- uint32_t uc = UTF8Util::DecodeNextChar(&p);
- *q++ = uc;
-
- OVR_ASSERT(q < line_buffer_ucs + LINE_SIZE);
- OVR_ASSERT(p < line_buffer_utf8 + LINE_SIZE);
-
- if (uc == 0) break;
- }
-
- // Encode back into UTF-8.
- q = line_buffer_ucs;
- int index = 0;
- for (;;)
- {
- uint32_t uc = *q++;
- OVR_ASSERT(index < LINE_SIZE * 6 - 6);
- int last_index = index;
- UTF8Util::EncodeChar(reencoded_utf8, &index, uc);
- OVR_ASSERT(index <= last_index + 6);
- if (uc == 0) break;
- }
-
- // This can be useful for debugging.
-#if 0
- // Show the UCS and the re-encoded UTF-8.
- log_ucs(line_buffer_ucs);
- log_ascii(reencoded_utf8);
-#endif // 0
-
- OVR_ASSERT(check_equal(line_buffer_utf8, line_buffer_ucs));
- OVR_ASSERT(check_equal(reencoded_utf8, line_buffer_ucs));
-
- // Start next line.
- byte_counter = 0;
- }
- }
-
- fclose(fp);
- }
-
- return 0;
-}
-
-
-#endif // UTF8_UNIT_TEST
-
-}} // namespace UTF8Util::OVR
-
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