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Fix Unicode handling in Json, don't sign-extend bytes in Stream.

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This commit is contained in:
Jordan Bancino 2023-07-15 17:57:21 +00:00
parent a4330123b9
commit c96ac30f28
7 changed files with 99 additions and 33 deletions
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44
Cytoplasm/src/Json.c
View file

@ -26,6 +26,7 @@
#include <Memory.h>
#include <Str.h>
#include <Util.h>
#include <Int.h>
#include <stdio.h>
#include <stddef.h>
@ -401,7 +402,10 @@ JsonDecodeString(Stream * in)
int c;
char a[5];
unsigned long utf8;
UInt32 codepoint;
UInt16 high;
UInt16 low;
char *utf8Ptr;
len = 0;
@ -480,14 +484,46 @@ JsonDecodeString(Stream * in)
return NULL;
}
/* Interpret characters as a hex number */
if (sscanf(a, "%04lx", &utf8) != 1)
if (sscanf(a, "%04hx", &high) != 1)
{
/* Bad hex value */
Free(str);
return NULL;
}
if (utf8 == 0)
/* If this is a two-byte UTF-16 codepoint, grab
* the second byte */
if (high > 0xD7FF && high <= 0xDBFF)
{
if (StreamGetc(in) != '\\' || StreamGetc(in) != 'u')
{
Free(str);
return NULL;
}
/* Read 4 characters into a */
if (!StreamGets(in, a, sizeof(a)))
{
Free(str);
return NULL;
}
/* Interpret characters as a hex number */
if (sscanf(a, "%04hx", &low) != 1)
{
Free(str);
return NULL;
}
codepoint = StrUtf16Decode(high, low);
}
else
{
codepoint = high;
}
if (codepoint == 0)
{
/*
* We read in a 0000, null. There is no
@ -507,7 +543,7 @@ JsonDecodeString(Stream * in)
/* Encode the 4-byte UTF-8 buffer into a series
* of 1-byte characters */
utf8Ptr = StrUtf8Encode(utf8);
utf8Ptr = StrUtf8Encode(codepoint);
if (!utf8Ptr)
{
/* Mem error */

51
Cytoplasm/src/Str.c
View file

@ -26,6 +26,7 @@
#include <Memory.h>
#include <Util.h>
#include <Rand.h>
#include <Int.h>
#include <stdlib.h>
#include <string.h>
@ -34,8 +35,28 @@
#include <pthread.h>
#include <unistd.h>
UInt32
StrUtf16Decode(UInt16 high, UInt16 low)
{
if (high <= 0xD7FF)
{
return high;
}
else if (high <= 0xDBFF)
{
unsigned short hS = (high - 0xD800) * 0x400;
unsigned short lS = low - 0xDC00;
return (lS | hS) + 0x10000;
}
else
{
return 0;
}
}
char *
StrUtf8Encode(unsigned long utf8)
StrUtf8Encode(UInt32 codepoint)
{
char *str;
@ -45,30 +66,30 @@ StrUtf8Encode(unsigned long utf8)
return NULL;
}
if (utf8 <= 0x7F) /* Plain ASCII */
if (codepoint <= 0x7F && codepoint != 0) /* Plain ASCII */
{
str[0] = (char) utf8;
str[0] = (char) codepoint;
str[1] = '\0';
}
else if (utf8 <= 0x07FF) /* 2-byte */
else if (codepoint <= 0x07FF) /* 2-byte */
{
str[0] = (char) (((utf8 >> 6) & 0x1F) | 0xC0);
str[1] = (char) (((utf8 >> 0) & 0x3F) | 0x80);
str[0] = (char) (((codepoint >> 6) & 0x1F) | 0xC0);
str[1] = (char) (((codepoint >> 0) & 0x3F) | 0x80);
str[2] = '\0';
}
else if (utf8 <= 0xFFFF) /* 3-byte */
else if (codepoint <= 0xFFFF) /* 3-byte */
{
str[0] = (char) (((utf8 >> 12) & 0x0F) | 0xE0);
str[1] = (char) (((utf8 >> 6) & 0x3F) | 0x80);
str[2] = (char) (((utf8 >> 0) & 0x3F) | 0x80);
str[0] = (char) (((codepoint >> 12) & 0x0F) | 0xE0);
str[1] = (char) (((codepoint >> 6) & 0x3F) | 0x80);
str[2] = (char) (((codepoint >> 0) & 0x3F) | 0x80);
str[3] = '\0';
}
else if (utf8 <= 0x10FFFF) /* 4-byte */
else if (codepoint <= 0x10FFFF)/* 4-byte */
{
str[0] = (char) (((utf8 >> 18) & 0x07) | 0xF0);
str[1] = (char) (((utf8 >> 12) & 0x3F) | 0x80);
str[2] = (char) (((utf8 >> 6) & 0x3F) | 0x80);
str[3] = (char) (((utf8 >> 0) & 0x3F) | 0x80);
str[0] = (char) (((codepoint >> 18) & 0x07) | 0xF0);
str[1] = (char) (((codepoint >> 12) & 0x3F) | 0x80);
str[2] = (char) (((codepoint >> 6) & 0x3F) | 0x80);
str[3] = (char) (((codepoint >> 0) & 0x3F) | 0x80);
str[4] = '\0';
}
else

5
Cytoplasm/src/Stream.c
View file

@ -26,6 +26,7 @@
#include <Io.h>
#include <Memory.h>
#include <Util.h>
#include <Int.h>
#include <stdio.h>
#include <stdlib.h>
@ -49,11 +50,11 @@ struct Stream
{
Io *io;
char *rBuf;
UInt8 *rBuf;
size_t rLen;
size_t rOff;
char *wBuf;
UInt8 *wBuf;
size_t wLen;
char *ugBuf;

11
Cytoplasm/src/include/Str.h
View file

@ -39,14 +39,21 @@
* is a standard library header.
*/
#include <Int.h>
#include <stddef.h>
/**
* Take a UTF-8 codepoint and encode it into a string buffer containing
* Convert UTF-16 into a Unicode codepoint.
*/
extern UInt32 StrUtf16Decode(UInt16, UInt16);
/**
* Take a Unicode codepoint and encode it into a string buffer containing
* between 1 and 4 bytes. The string buffer is allocated on the heap,
* so it should be freed when it is no longer needed.
*/
extern char * StrUtf8Encode(unsigned long);
extern char * StrUtf8Encode(UInt32);
/**
* Duplicate a null-terminated string, returning a new string on the

12
src/Room.c
View file

@ -38,13 +38,13 @@ struct Room
};
Room *
RoomCreate(Db *db, HashMap *json)
RoomCreate(Db * db, HashMap * json)
{
return NULL;
}
Room *
RoomLock(Db *db, char *id)
RoomLock(Db * db, char *id)
{
DbRef *ref;
Room *room;
@ -76,7 +76,7 @@ RoomLock(Db *db, char *id)
}
int
RoomUnlock(Room *room)
RoomUnlock(Room * room)
{
Db *db;
DbRef *ref;
@ -96,19 +96,19 @@ RoomUnlock(Room *room)
}
char *
RoomIdGet(Room *room)
RoomIdGet(Room * room)
{
return room ? room->id : NULL;
}
int
RoomVersionGet(Room *room)
RoomVersionGet(Room * room)
{
return room ? room->version : 0;
}
HashMap *
RoomStateGet(Room *room)
RoomStateGet(Room * room)
{
if (!room)
{

6
src/State.c
View file

@ -31,19 +31,19 @@
#include <Event.h>
static HashMap *
StateResolveV1(Array *states)
StateResolveV1(Array * states)
{
return NULL;
}
static HashMap *
StateResolveV2(Array *states)
StateResolveV2(Array * states)
{
return NULL;
}
HashMap *
StateResolve(Room *room, HashMap *event)
StateResolve(Room * room, HashMap * event)
{
Array *states;
size_t i;

3
tools/src/json.c
View file

@ -256,7 +256,8 @@ Main(Array * args)
switch (flag)
{
case FLAG_SELECT:
query(input, json, canonical); /* This will implicitly free json */
query(input, json, canonical); /* This will implicitly
* free json */
break;
case FLAG_ENCODE:
encode(input, canonical);