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node_buffer.h
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65 lines (50 loc) · 2.22 KB
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#ifndef SRC_NODE_BUFFER_H_
#define SRC_NODE_BUFFER_H_
#include "node.h"
#include "v8.h"
namespace node {
namespace Buffer {
static const unsigned int kMaxLength =
sizeof(int32_t) == sizeof(intptr_t) ? 0x3fffffff : 0x7fffffff;
NODE_EXTERN typedef void (*FreeCallback)(char* data, void* hint);
NODE_EXTERN bool HasInstance(v8::Local<v8::Value> val);
NODE_EXTERN bool HasInstance(v8::Local<v8::Object> val);
NODE_EXTERN char* Data(v8::Local<v8::Value> val);
NODE_EXTERN char* Data(v8::Local<v8::Object> val);
NODE_EXTERN size_t Length(v8::Local<v8::Value> val);
NODE_EXTERN size_t Length(v8::Local<v8::Object> val);
// public constructor - data is copied
NODE_EXTERN v8::MaybeLocal<v8::Object> Copy(v8::Isolate* isolate,
const char* data,
size_t len);
// public constructor
NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate, size_t length);
// public constructor from string
NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate,
v8::Local<v8::String> string,
enum encoding enc = UTF8);
// public constructor - data is used, callback is passed data on object gc
NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate,
char* data,
size_t length,
FreeCallback callback,
void* hint);
// public constructor - data is used.
NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate,
char* data,
size_t len);
// This is verbose to be explicit with inline commenting
static inline bool IsWithinBounds(size_t off, size_t len, size_t max) {
// Asking to seek too far into the buffer
// check to avoid wrapping in subsequent subtraction
if (off > max)
return false;
// Asking for more than is left over in the buffer
if (max - off < len)
return false;
// Otherwise we're in bounds
return true;
}
} // namespace Buffer
} // namespace node
#endif // SRC_NODE_BUFFER_H_