Work some more on C StringsBuffer

src/Client/Platform.h

@@ -8,71 +8,44 @@
    Copyright 2017 ClassicalSharp | Licensed under BSD-3
 */
 
-/* Newline for text */
-extern UInt8* Platform_NewLine;
+extern UInt8* Platform_NewLine; /* Newline for text */
 extern UInt8 Platform_DirectorySeparator;
 extern ReturnCode ReturnCode_FileShareViolation;
 
-/* Initalises required state for this platform. */
 void Platform_Init(void);
-/* Releases the resources allocated for the required state. */
 void Platform_Free(void);
 
-/* Allocates a block of memory, returning NULL on failure. */
 void* Platform_MemAlloc(UInt32 numBytes);
-/* Frees a previously allocated block of memory. */
+void* Platform_MemRealloc(void* mem, UInt32 numBytes);
 void Platform_MemFree(void* mem);
-/* Sets a block of memory to the given byte value. */
 void Platform_MemSet(void* dst, UInt8 value, UInt32 numBytes);
-/* Copies a block of non-overlapping memory. */
 void Platform_MemCpy(void* dst, void* src, UInt32 numBytes);
 
-/* Logs a message to console (if attached). Implictly puts each entry on a newline. */
 void Platform_Log(STRING_PURE String* message);
-/* Gets the current time, in UTC timezone. */
 DateTime Platform_CurrentUTCTime(void);
-/* Gets the current time, in user's local timezone. */
 DateTime Platform_CurrentLocalTime(void);
 
-/* Returns whether a directory with the given name exists. */
 bool Platform_DirectoryExists(STRING_PURE String* path);
-/* Creates a new directory. */
 ReturnCode Platform_DirectoryCreate(STRING_PURE String* path);
-/* Returns whether a file with the given name exists. */
 bool Platform_FileExists(STRING_PURE String* path);
 
-/* Creates or overwrites an existing file. */
 ReturnCode Platform_FileCreate(void** file, STRING_PURE String* path);
-/* Opens an existing file. */
 ReturnCode Platform_FileOpen(void** file, STRING_PURE String* path, bool readOnly);
-/* Reads a block of bytes from the given file, returning a platform-specific return code. */
 ReturnCode Platform_FileRead(void* file, UInt8* buffer, UInt32 count, UInt32* bytesRead);
-/* Writes a block of bytes to the given file, returning a platform-specific return code. */
 ReturnCode Platform_FileWrite(void* file, UInt8* buffer, UInt32 count, UInt32* bytesWritten);
-/* Closes the given file. */
 ReturnCode Platform_FileClose(void* file);
-/* Seeks / adjusts position within the file. */
 ReturnCode Platform_FileSeek(void* file, Int32 offset, Int32 seekType);
-/* Returns current position/offset within the file. */
 UInt32 Platform_FilePosition(void* file);
-/* Returns the length of the given file. */
 UInt32 Platform_FileLength(void* file);
 
-/* Blocks the calling thread for given number of milliseconds. */
 void Platform_ThreadSleep(UInt32 milliseconds);
 
 struct DrawTextArgs_;
 struct Bitmap_;
-/* Allocates handle for the given font. */
 void Platform_MakeFont(FontDesc* desc, STRING_PURE String* fontName);
-/* Frees handle for the given font. */
 void Platform_FreeFont(FontDesc* desc);
-/* Measures size of given text.*/
 Size2D Platform_MeasureText(struct DrawTextArgs_* args);
-/* Draws text onto the actively selected bitmap. */
 void Platform_DrawText(struct DrawTextArgs_* args, Int32 x, Int32 y);
-/* Sets the bitmap used for text drawing. */
 void Platform_SetBitmap(struct Bitmap_* bmp);
-/* Releases the bitmap that was used for text drawing.*/
 void Platform_ReleaseBitmap(void);
 #endif

src/Client/String.c

@@ -1,6 +1,7 @@
 #include "String.h"
 #include "Funcs.h"
 #include "ErrorHandler.h"
+#include "Platform.h"
 
 String String_Init(STRING_REF UInt8* buffer, UInt16 length, UInt16 capacity) {
 	String str;
@@ -384,6 +385,23 @@ bool Convert_TryParseBool(STRING_PURE String* str, bool* value) {
 
 #define STRINGSBUFFER_LEN_SHIFT 10
 #define STRINGSBUFFER_LEN_MASK  0x3FFUL
+void StringBuffers_Init(StringsBuffer* buffer) {
+	buffer->Count = 0;
+	buffer->TextBuffer  = buffer->DefaultBuffer;
+	buffer->FlagsBuffer = buffer->DefaultFlags;
+	buffer->TextBufferSize   = STRINGSBUFFER_DEF_BUFFER_SIZE;
+	buffer->FlagsBufferElems = STRINGSBUFFER_DEF_FLAGS_ELEMS;
+}
+
+void StringsBuffer_Free(StringsBuffer* buffer) {
+	if (buffer->TextBufferSize > STRINGSBUFFER_DEF_BUFFER_SIZE) {
+		Platform_MemFree(buffer->TextBuffer);
+	}
+	if (buffer->FlagsBufferElems > STRINGSBUFFER_DEF_FLAGS_ELEMS) {
+		Platform_MemFree(buffer->FlagsBuffer);
+	}
+}
+
 void StringsBuffer_Get(StringsBuffer* buffer, UInt32 index, STRING_TRANSIENT String* text) {
 	String raw = StringsBuffer_UNSAFE_Get(buffer, index);
 	String_Clear(text);
@@ -393,8 +411,32 @@ void StringsBuffer_Get(StringsBuffer* buffer, UInt32 index, STRING_TRANSIENT Str
 String StringsBuffer_UNSAFE_Get(StringsBuffer* buffer, UInt32 index) {
 	if (index >= buffer->Count) ErrorHandler_Fail("Tried to get String past StringsBuffer end");
 
-	UInt32 flags = buffer->FlagsBuffer[index];
+	UInt32 flags  = buffer->FlagsBuffer[index];
 	UInt32 offset = flags >> STRINGSBUFFER_LEN_SHIFT;
 	UInt32 len    = flags  & STRINGSBUFFER_LEN_MASK;
 	return String_Init(&buffer->TextBuffer[offset], (UInt16)len, (UInt16)len);
+}
+
+void StringsBuffer_Remove(StringsBuffer* buffer, UInt32 index) {
+	if (index >= buffer->Count) ErrorHandler_Fail("Tried to remove String past StringsBuffer end");
+
+	UInt32 flags  = buffer->FlagsBuffer[index];
+	UInt32 offset = flags >> STRINGSBUFFER_LEN_SHIFT;
+	UInt32 len    = flags  & STRINGSBUFFER_LEN_MASK;
+
+	UInt32 lastFlags  = buffer->FlagsBuffer[buffer->Count - 1];
+	UInt32 lastOffset = lastFlags >> STRINGSBUFFER_LEN_SHIFT;
+	UInt32 lastLen    = lastFlags  & STRINGSBUFFER_LEN_MASK;
+
+	/* Imagine buffer is this: XXYYYYZZZ, and want to delete X */
+	/* Start points to first character of Y */
+	/* End points to last character of Z */
+	UInt32 i, start = offset + len, end = lastOffset + lastLen;
+	for (i = start; i < end; i++) { 
+		buffer->TextBuffer[i - len] = buffer->TextBuffer[i]; 
+	}
+	for (i = index; i < buffer->Count; i++) {
+		buffer->FlagsBuffer[i] = buffer->FlagsBuffer[i + 1];
+	}
+	buffer->Count--;
 }

src/Client/String.h

@@ -72,14 +72,16 @@ bool Convert_TryParseUInt16(STRING_PURE String* str, UInt16* value);
 bool Convert_TryParseReal32(STRING_PURE String* str, Real32* value);
 bool Convert_TryParseBool(STRING_PURE String* str, bool* value);
 
-/* todo use a single byte array for all strings, each 'string' is 22 bits offsrt, 10 bits length into this array. */
-/* means resizing is expensive tho*/
+#define STRINGSBUFFER_DEF_BUFFER_SIZE 4096
+#define STRINGSBUFFER_DEF_FLAGS_ELEMS 256
 typedef struct StringsBuffer_ {
 	UInt8* TextBuffer;
 	UInt32 TextBufferSize;
 	UInt32* FlagsBuffer;
-	UInt32 FlagsBufferSize;
+	UInt32 FlagsBufferElems;
 	UInt32 Count;
+	UInt8 DefaultBuffer[STRINGSBUFFER_DEF_BUFFER_SIZE];
+	UInt32 DefaultFlags[STRINGSBUFFER_DEF_FLAGS_ELEMS];
 } StringsBuffer;
 
 void StringBuffers_Init(StringsBuffer* buffer);

src/Client/WinPlatform.c

@@ -61,6 +61,10 @@ void* Platform_MemAlloc(UInt32 numBytes) {
 	return HeapAlloc(heap, 0, numBytes);
 }
 
+void* Platform_MemRealloc(void* mem, UInt32 numBytes) {
+	return HeapReAlloc(heap, 0, mem, numBytes);
+}
+
 void Platform_MemFree(void* mem) {
 	HeapFree(heap, 0, mem);
 }
@@ -188,13 +192,15 @@ void Platform_ThreadSleep(UInt32 milliseconds) {
 }
 
 
-void Platform_MakeFont(FontDesc* desc) {
+void Platform_MakeFont(FontDesc* desc, STRING_PURE String* fontName) {
 	LOGFONTA font = { 0 };
 	font.lfHeight    = -Math_Ceil(desc->Size * GetDeviceCaps(hdc, LOGPIXELSY) / 72.0f);
 	font.lfUnderline = desc->Style == FONT_STYLE_UNDERLINE;
 	font.lfWeight    = desc->Style == FONT_STYLE_BOLD ? FW_BOLD : FW_NORMAL;
 	font.lfQuality   = ANTIALIASED_QUALITY;
 
+	String dstName = String_Init(font.lfFaceName, 0, LF_FACESIZE);
+	String_AppendString(&dstName, fontName);
 	desc->Handle = CreateFontIndirectA(&font);
 	if (desc->Handle == NULL) ErrorHandler_Fail("Creating font handle failed");
 }
@@ -204,6 +210,7 @@ void Platform_FreeFont(FontDesc* desc) {
 	desc->Handle = NULL;
 }
 
+/* TODO: Associate Font with device */
 Size2D Platform_MeasureText(struct DrawTextArgs_* args) {
 	HDC hDC = GetDC(NULL);
 	RECT r = { 0 };