101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
|
// Copyright 2004-present Facebook. All Rights Reserved.
|
||
|
|
|
||
|
|
#include "JSIndexedRAMBundle.h"
|
||
|
|
|
||
|
|
#include <folly/Memory.h>
|
||
|
|
|
||
|
|
#include "oss-compat-util.h"
|
||
|
|
|
||
|
|
namespace facebook {
|
||
|
|
namespace react {
|
||
|
|
|
||
|
|
std::function<std::unique_ptr<JSModulesUnbundle>(std::string)> JSIndexedRAMBundle::buildFactory() {
|
||
|
|
return [](const std::string& bundlePath){
|
||
|
|
return folly::make_unique<JSIndexedRAMBundle>(bundlePath.c_str());
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
JSIndexedRAMBundle::JSIndexedRAMBundle(const char *sourcePath) :
|
||
|
|
m_bundle (sourcePath, std::ios_base::in) {
|
||
|
|
if (!m_bundle) {
|
||
|
|
throw std::ios_base::failure(
|
||
|
|
toString("Bundle ", sourcePath,
|
||
|
|
"cannot be opened: ", m_bundle.rdstate()));
|
||
|
|
}
|
||
|
|
|
||
|
|
// read in magic header, number of entries, and length of the startup section
|
||
|
|
uint32_t header[3];
|
||
|
|
static_assert(
|
||
|
|
sizeof(header) == 12,
|
||
|
|
"header size must exactly match the input file format");
|
||
|
|
|
||
|
|
readBundle(reinterpret_cast<char *>(header), sizeof(header));
|
||
|
|
const size_t numTableEntries = littleEndianToHost(header[1]);
|
||
|
|
const size_t startupCodeSize = littleEndianToHost(header[2]);
|
||
|
|
|
||
|
|
// allocate memory for meta data and lookup table.
|
||
|
|
m_table = ModuleTable(numTableEntries);
|
||
|
|
m_baseOffset = sizeof(header) + m_table.byteLength();
|
||
|
|
|
||
|
|
// read the lookup table from the file
|
||
|
|
readBundle(
|
||
|
|
reinterpret_cast<char *>(m_table.data.get()), m_table.byteLength());
|
||
|
|
|
||
|
|
// read the startup code
|
||
|
|
m_startupCode = std::unique_ptr<JSBigBufferString>(new JSBigBufferString{startupCodeSize - 1});
|
||
|
|
|
||
|
|
readBundle(m_startupCode->data(), startupCodeSize - 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
JSIndexedRAMBundle::Module JSIndexedRAMBundle::getModule(uint32_t moduleId) const {
|
||
|
|
Module ret;
|
||
|
|
ret.name = toString(moduleId, ".js");
|
||
|
|
ret.code = getModuleCode(moduleId);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
std::unique_ptr<const JSBigString> JSIndexedRAMBundle::getStartupCode() {
|
||
|
|
CHECK(m_startupCode) << "startup code for a RAM Bundle can only be retrieved once";
|
||
|
|
return std::move(m_startupCode);
|
||
|
|
}
|
||
|
|
|
||
|
|
std::string JSIndexedRAMBundle::getModuleCode(const uint32_t id) const {
|
||
|
|
const auto moduleData = id < m_table.numEntries ? &m_table.data[id] : nullptr;
|
||
|
|
|
||
|
|
// entries without associated code have offset = 0 and length = 0
|
||
|
|
const uint32_t length = moduleData ? littleEndianToHost(moduleData->length) : 0;
|
||
|
|
if (length == 0) {
|
||
|
|
throw std::ios_base::failure(
|
||
|
|
toString("Error loading module", id, "from RAM Bundle"));
|
||
|
|
}
|
||
|
|
|
||
|
|
std::string ret(length - 1, '\0');
|
||
|
|
readBundle(&ret.front(), length - 1, m_baseOffset + littleEndianToHost(moduleData->offset));
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
void JSIndexedRAMBundle::readBundle(char *buffer, const std::streamsize bytes) const {
|
||
|
|
if (!m_bundle.read(buffer, bytes)) {
|
||
|
|
if (m_bundle.rdstate() & std::ios::eofbit) {
|
||
|
|
throw std::ios_base::failure("Unexpected end of RAM Bundle file");
|
||
|
|
}
|
||
|
|
throw std::ios_base::failure(
|
||
|
|
toString("Error reading RAM Bundle: ", m_bundle.rdstate()));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void JSIndexedRAMBundle::readBundle(
|
||
|
|
char *buffer,
|
||
|
|
const std::streamsize bytes,
|
||
|
|
const std::ifstream::pos_type position) const {
|
||
|
|
|
||
|
|
if (!m_bundle.seekg(position)) {
|
||
|
|
throw std::ios_base::failure(
|
||
|
|
toString("Error reading RAM Bundle: ", m_bundle.rdstate()));
|
||
|
|
}
|
||
|
|
readBundle(buffer, bytes);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace react
|
||
|
|
} // namespace facebook
|