michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "vm/Xdr.h"
michael@0: 
michael@0: #include <string.h>
michael@0: 
michael@0: #include "jsapi.h"
michael@0: #include "jsscript.h"
michael@0: 
michael@0: #include "vm/Debugger.h"
michael@0: 
michael@0: using namespace js;
michael@0: 
michael@0: void
michael@0: XDRBuffer::freeBuffer()
michael@0: {
michael@0:     js_free(base);
michael@0: #ifdef DEBUG
michael@0:     memset(this, 0xe2, sizeof *this);
michael@0: #endif
michael@0: }
michael@0: 
michael@0: bool
michael@0: XDRBuffer::grow(size_t n)
michael@0: {
michael@0:     JS_ASSERT(n > size_t(limit - cursor));
michael@0: 
michael@0:     const size_t MEM_BLOCK = 8192;
michael@0:     size_t offset = cursor - base;
michael@0:     size_t newCapacity = JS_ROUNDUP(offset + n, MEM_BLOCK);
michael@0:     if (isUint32Overflow(newCapacity)) {
michael@0:         JS_ReportErrorNumber(cx(), js_GetErrorMessage, nullptr, JSMSG_TOO_BIG_TO_ENCODE);
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     void *data = js_realloc(base, newCapacity);
michael@0:     if (!data) {
michael@0:         js_ReportOutOfMemory(cx());
michael@0:         return false;
michael@0:     }
michael@0:     base = static_cast<uint8_t *>(data);
michael@0:     cursor = base + offset;
michael@0:     limit = base + newCapacity;
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: template<XDRMode mode>
michael@0: bool
michael@0: XDRState<mode>::codeChars(jschar *chars, size_t nchars)
michael@0: {
michael@0:     size_t nbytes = nchars * sizeof(jschar);
michael@0:     if (mode == XDR_ENCODE) {
michael@0:         uint8_t *ptr = buf.write(nbytes);
michael@0:         if (!ptr)
michael@0:             return false;
michael@0:         mozilla::NativeEndian::copyAndSwapToLittleEndian(ptr, chars, nchars);
michael@0:     } else {
michael@0:         const uint8_t *ptr = buf.read(nbytes);
michael@0:         mozilla::NativeEndian::copyAndSwapFromLittleEndian(chars, ptr, nchars);
michael@0:     }
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: template<XDRMode mode>
michael@0: static bool
michael@0: VersionCheck(XDRState<mode> *xdr)
michael@0: {
michael@0:     uint32_t bytecodeVer;
michael@0:     if (mode == XDR_ENCODE)
michael@0:         bytecodeVer = XDR_BYTECODE_VERSION;
michael@0: 
michael@0:     if (!xdr->codeUint32(&bytecodeVer))
michael@0:         return false;
michael@0: 
michael@0:     if (mode == XDR_DECODE && bytecodeVer != XDR_BYTECODE_VERSION) {
michael@0:         /* We do not provide binary compatibility with older scripts. */
michael@0:         JS_ReportErrorNumber(xdr->cx(), js_GetErrorMessage, nullptr, JSMSG_BAD_SCRIPT_MAGIC);
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: template<XDRMode mode>
michael@0: bool
michael@0: XDRState<mode>::codeFunction(MutableHandleObject objp)
michael@0: {
michael@0:     if (mode == XDR_DECODE)
michael@0:         objp.set(nullptr);
michael@0: 
michael@0:     if (!VersionCheck(this))
michael@0:         return false;
michael@0: 
michael@0:     return XDRInterpretedFunction(this, NullPtr(), NullPtr(), objp);
michael@0: }
michael@0: 
michael@0: template<XDRMode mode>
michael@0: bool
michael@0: XDRState<mode>::codeScript(MutableHandleScript scriptp)
michael@0: {
michael@0:     if (mode == XDR_DECODE)
michael@0:         scriptp.set(nullptr);
michael@0: 
michael@0:     if (!VersionCheck(this))
michael@0:         return false;
michael@0: 
michael@0:     if (!XDRScript(this, NullPtr(), NullPtr(), NullPtr(), scriptp))
michael@0:         return false;
michael@0: 
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: template<XDRMode mode>
michael@0: bool
michael@0: XDRState<mode>::codeConstValue(MutableHandleValue vp)
michael@0: {
michael@0:     return XDRScriptConst(this, vp);
michael@0: }
michael@0: 
michael@0: XDRDecoder::XDRDecoder(JSContext *cx, const void *data, uint32_t length,
michael@0:                        JSPrincipals *originPrincipals)
michael@0:   : XDRState<XDR_DECODE>(cx)
michael@0: {
michael@0:     buf.setData(data, length);
michael@0:     this->originPrincipals_ = originPrincipals;
michael@0: }
michael@0: 
michael@0: template class js::XDRState<XDR_ENCODE>;
michael@0: template class js::XDRState<XDR_DECODE>;