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/* Nujel - Copyright (C) 2020-2022 - Benjamin Vincent Schulenburg
* This project uses the MIT license, a copy should be included under /LICENSE */
#ifndef NUJEL_AMALGAMATION
#include "nujel-private.h"
#endif
#include <stdlib.h>
#include <string.h>
const void *lBufferData (lBuffer *v){
return v == NULL ? NULL : v->buf;
}
void *lBufferDataMutable(lBuffer *v){
if(v->flags & BUFFER_IMMUTABLE){return NULL;}
return v == NULL ? NULL : v->buf;
}
const char *lStringData(const lString *v){
return v == NULL ? NULL : v->data;
}
size_t lBufferLength(const lBuffer *v){
return v == NULL ? 0 : v->length;
}
const void *lBufferViewData(lBufferView *v){
if(unlikely(v == NULL)){return NULL;}
if(unlikely(v->buf->flags & BUFFER_IMMUTABLE)){return NULL;}
return &((u8 *)v->buf->buf)[v->offset * lBufferViewTypeSize(v->type)];
}
void *lBufferViewDataMutable(lBufferView *v){
return &((u8 *)v->buf->buf)[v->offset * lBufferViewTypeSize(v->type)];
}
size_t lBufferViewLength(const lBufferView *v){
return v->length * lBufferViewTypeSize(v->type);
}
static lVal lnfBufferAllocate(lClosure *c, lVal v) {
(void)c;
lVal car = requireNaturalInt(lCar(v));
if(unlikely(car.type == ltException)){
return car;
}
const i64 size = car.vInt;
lBuffer *buf = lBufferAlloc(size, false);
return lValAlloc(ltBuffer, buf);
}
static lVal lnfBufferLengthGet(lClosure *c, lVal v){
(void)c;
lVal car = lCar(v);
switch(car.type){
default:
return lValException("type-error", "Expected a buffer or something compatible", car);
case ltString:
case ltBuffer:
return lValInt(car.vBuffer->length);
case ltBufferView:
return lValInt(car.vBufferView->length);
}
}
static lVal lnfBufferLengthSet(lClosure *c, lVal v){
(void)c;
lVal bufv = requireMutableBuffer(lCar(v));
if(unlikely(bufv.type == ltException)){
return bufv;
}
lBuffer *buf = bufv.vBuffer;
lVal lenVal = requireNaturalInt(lCadr(v));
if(unlikely(lenVal.type == ltException)){
return lenVal;
}
const int length = lenVal.vInt;
if(length < buf->length){
return lValException("error", "Buffers can only grow, not shrink.", v);
}
void *nBuf = realloc(buf->buf, length);
if (unlikely(nBuf == NULL)) {
return lValException("out-of-memory", "(buffer/length!) couldn't allocate its buffer", v);
}
memset(&((u8 *)nBuf)[buf->length], 0, length - buf->length);
buf->buf = nBuf;
buf->length = length;
return bufv;
}
static lVal lnfBufferImmutableGet(lClosure *c, lVal v){
(void)c;
lVal car = lCar(v);
switch(car.type){
case ltBufferView:
return lValBool(car.vBufferView->flags & BUFFER_VIEW_IMMUTABLE);
case ltString:
return lValBool(true);
case ltBuffer:
return lValBool(car.vBuffer->flags & BUFFER_IMMUTABLE);
default:
return lValException("type-error", "Can't get immutability info from that: ", car);
}
}
static lVal bufferFromPointer(lClosure *c, bool immutable, const void *data, size_t length){
(void)c;
lBuffer *retBuf = lBufferAllocRaw();
retBuf->length = length;
retBuf->flags = immutable ? BUFFER_IMMUTABLE : 0;
retBuf->buf = malloc(length);
if (unlikely(retBuf->buf == NULL)) {
return lValException("out-of-memory", "(buffer/length!) couldn't allocate a buffer", NIL);
}
memcpy(retBuf->buf, data, length);
return lValAlloc(ltBuffer, retBuf);
}
static lVal lnfBufferDup(lClosure *c, lVal v){
lVal vBuf = requireBuffer(lCar(v));
if(unlikely(vBuf.type == ltException)){
return vBuf;
}
lBuffer *buf = vBuf.vBuffer;
return bufferFromPointer(c, castToBool(lCadr(v)), buf->buf, buf->length);
}
static lVal lnfBufferCopy(lClosure *c, lVal v){
(void)c;
lVal car = requireMutableBuffer(lCar(v));
if(unlikely(car.type == ltException)){
return car;
}
lBuffer *dest = car.vBuffer;
lVal vSrc = lCadr(v);
lVal offV = requireNaturalInt(lCaddr(v));
if(unlikely(offV.type == ltException)){
return offV;
}
const int destOffset = offV.vInt;
const void *buf = NULL;
int length = 0;
switch(vSrc.type){
case ltString:
case ltBuffer:
buf = vSrc.vBuffer->data;
length = castToInt(lCadddr(v), vSrc.vBuffer->length);
break;
}
if(unlikely((buf == NULL) || (length < 0))){
return lValException("type-error", "Can't copy from that", vSrc);
}
if(unlikely(((length + destOffset) > dest->length) || (length > vSrc.vBuffer->length))){
return lValException("out-of-bounds", "Can't fit everything in that buffer", v);
}
memcpy(&((u8*)dest->buf)[destOffset], buf, length);
return car;
}
static lVal lnfStringToBuffer(lClosure *c, lVal v){
lVal car = requireString(lCar(v));
if(unlikely(car.type == ltException)){
return car;
}
lString *str = car.vString;
return bufferFromPointer(c, castToBool(lCadr(v)), str->data, str->length);
}
static lVal lnfBufferToString(lClosure *c, lVal v){
(void)c;
lVal car = requireBuffer(lCar(v));
if(unlikely(car.type == ltException)){
return car;
}
lBuffer *buf = car.vBuffer;
const i64 length = castToInt(lCadr(v), buf->length);
if(unlikely(length < 0)){
return lValException("type-error", "Length has to be greater than 0", lCadr(v));
}
return lValStringLen(buf->buf, length);
}
static lVal bufferView(lClosure *c, lVal v, lBufferViewType T){
(void)c;
lVal car = requireBuffer(lCar(v));
if(unlikely(car.type == ltException)){
return car;
}
lBuffer *buf = car.vBuffer;
const bool immutable = lCdr(v).type != ltNil ? castToBool(lCadr(v)) : buf->flags & BUFFER_IMMUTABLE;
if(unlikely(!immutable && (buf->flags & BUFFER_IMMUTABLE))){
return lValException("type-error", "Can't create a mutable view for an immutable buffer", v);
}
const size_t length = buf->length / lBufferViewTypeSize(T);
lBufferView *bufView = lBufferViewAlloc(buf, T, 0, length, immutable);
return lValAlloc(ltBufferView, bufView);
}
static lVal lnfBufferViewU8(lClosure *c, lVal v){ return bufferView(c, v, lbvtU8); }
static lVal lnfBufferViewS8(lClosure *c, lVal v){ return bufferView(c, v, lbvtS8); }
static lVal lnfBufferViewU16(lClosure *c, lVal v){ return bufferView(c, v, lbvtU16); }
static lVal lnfBufferViewS16(lClosure *c, lVal v){ return bufferView(c, v, lbvtS16); }
static lVal lnfBufferViewU32(lClosure *c, lVal v){ return bufferView(c, v, lbvtU32); }
static lVal lnfBufferViewS32(lClosure *c, lVal v){ return bufferView(c, v, lbvtS32); }
static lVal lnfBufferViewF32(lClosure *c, lVal v){ return bufferView(c, v, lbvtF32); }
static lVal lnfBufferViewS64(lClosure *c, lVal v){ return bufferView(c, v, lbvtS64); }
static lVal lnfBufferViewF64(lClosure *c, lVal v){ return bufferView(c, v, lbvtF64); }
static lVal lnfBufferViewBuffer(lClosure *c, lVal v){
(void)c;
lVal car = requireBufferView(lCar(v));
if(unlikely(car.type == ltException)){
return car;
}
lBufferView *view = car.vBufferView;
return lValAlloc(ltBuffer, view->buf);
}
void lOperationsBuffer(lClosure *c){
lAddNativeFunc(c, "buffer/allocate", "(length)", "Allocate a new buffer of LENGTH", lnfBufferAllocate);
lAddNativeFunc(c, "buffer/length!", "(buf new-length)", "Set the size of BUF to NEW-LENGTH", lnfBufferLengthSet);
lAddNativeFunc(c, "buffer/dup", "(buf immutable?)", "Return a copy of BUF that might be IMMUTABLE", lnfBufferDup);
lAddNativeFunc(c, "buffer/copy", "(dest src dest-offset length)","Return a copy of BUF that might be IMMUTABLE", lnfBufferCopy);
lAddNativeFunc(c, "string->buffer", "(str immutable?)", "Copy STR into a buffer and return it", lnfStringToBuffer);
lAddNativeFunc(c, "buffer->string", "(buf length)", "Turn BUF into a string of LENGTH which defaults to the size of BUF", lnfBufferToString);
lAddNativeFunc(c, "buffer/u8*", "(buf immutable?)", "Create a new view for BUF spanning the entire area", lnfBufferViewU8);
lAddNativeFunc(c, "buffer/s8*", "(buf immutable?)", "Create a new view for BUF spanning the entire area", lnfBufferViewS8);
lAddNativeFunc(c, "buffer/u16*", "(buf immutable?)", "Create a new view for BUF spanning the entire area", lnfBufferViewU16);
lAddNativeFunc(c, "buffer/s16*", "(buf immutable?)", "Create a new view for BUF spanning the entire area", lnfBufferViewS16);
lAddNativeFunc(c, "buffer/u32*", "(buf immutable?)", "Create a new view for BUF spanning the entire area", lnfBufferViewU32);
lAddNativeFunc(c, "buffer/s32*", "(buf immutable?)", "Create a new view for BUF spanning the entire area", lnfBufferViewS32);
lAddNativeFunc(c, "buffer/f32*", "(buf immutable?)", "Create a new view for BUF spanning the entire area", lnfBufferViewF32);
lAddNativeFunc(c, "buffer/s64*", "(buf immutable?)", "Create a new view for BUF spanning the entire area", lnfBufferViewS64);
lAddNativeFunc(c, "buffer/f64*", "(buf immutable?)", "Create a new view for BUF spanning the entire area", lnfBufferViewF64);
lAddNativeFunc(c, "buffer-view->buffer", "(view)", "Return the buffer of VIEW", lnfBufferViewBuffer);
lAddNativeFunc(c, "buffer/length", "(buf)", "Return the size of BUF in bytes", lnfBufferLengthGet);
lAddNativeFunc(c, "buffer/immutable?", "(buf)", "Return #t if BUF is immutable", lnfBufferImmutableGet);
}
