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Provide basic non-owning memstream implementation for Kaitai parsers to use

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This commit is contained in:
Nikolaj Schlej 2022-09-13 08:11:28 +02:00 committed by Nikolaj Schlej
parent f514c60cba
commit 06653d024b
1 changed files with 44 additions and 5 deletions
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49
common/fitparser.cpp
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@ -29,6 +29,45 @@
#include "generated/intel_keym_v2.h"
#include "generated/intel_acm.h"
// TODO: put into separate H/CPP when we start using Kaitai for other parsers
// TODO: this implementation is certainly not a valid replacement to std::stringstream
// TODO: because it only supports getting through the buffer once
// TODO: however, we already do it this way, so it's enough for practical purposes of this file
class membuf : public std::streambuf {
public:
membuf(const char *p, size_t l) {
setg((char*)p, (char*)p, (char*)p + l);
}
pos_type seekoff(off_type off, std::ios_base::seekdir dir, std::ios_base::openmode which = std::ios_base::in) override
{
(void)which;
if (dir == std::ios_base::cur)
gbump((int)off);
else if (dir == std::ios_base::end)
setg(eback(), egptr() + off, egptr());
else if (dir == std::ios_base::beg)
setg(eback(), eback() + off, egptr());
return gptr() - eback();
}
pos_type seekpos(pos_type sp, std::ios_base::openmode which) override
{
return seekoff(sp - pos_type(off_type(0)), std::ios_base::beg, which);
}
};
class memstream : public std::istream {
public:
memstream(const char *p, size_t l) : std::istream(&buffer_),
buffer_(p, l) {
rdbuf(&buffer_);
}
private:
membuf buffer_;
};
USTATUS FitParser::parseFit(const UModelIndex & index)
{
// Reset parser state
@ -279,7 +318,7 @@ USTATUS FitParser::parseFitEntryMicrocode(const UByteArray & microcode, const UI
USTATUS FitParser::parseFitEntryAcm(const UByteArray & acm, const UINT32 localOffset, const UModelIndex & parent, UString & info, UINT32 &realSize)
{
try {
std::istringstream is(std::string(acm.constData(), acm.size()));
memstream is(acm.constData(), acm.size());
is.seekg(localOffset, is.beg);
kaitai::kstream ks(&is);
intel_acm_t parsed(&ks);
@ -396,7 +435,7 @@ USTATUS FitParser::parseFitEntryBootGuardKeyManifest(const UByteArray & keyManif
// v1
try {
std::istringstream is(std::string(keyManifest.constData(), keyManifest.size()));
memstream is(keyManifest.constData(), keyManifest.size());
is.seekg(localOffset, is.beg);
kaitai::kstream ks(&is);
intel_keym_v1_t parsed(&ks);
@ -465,7 +504,7 @@ USTATUS FitParser::parseFitEntryBootGuardKeyManifest(const UByteArray & keyManif
// v2
try {
std::istringstream is(std::string(keyManifest.constData(), keyManifest.size()));
memstream is(keyManifest.constData(), keyManifest.size());
is.seekg(localOffset, is.beg);
kaitai::kstream ks(&is);
intel_keym_v2_t parsed(&ks);
@ -563,7 +602,7 @@ USTATUS FitParser::parseFitEntryBootGuardBootPolicy(const UByteArray & bootPolic
// v1
try {
std::istringstream is(std::string(bootPolicy.constData(), bootPolicy.size()));
memstream is(bootPolicy.constData(), bootPolicy.size());
is.seekg(localOffset, is.beg);
kaitai::kstream ks(&is);
intel_acbp_v1_t parsed(&ks);
@ -821,7 +860,7 @@ USTATUS FitParser::parseFitEntryBootGuardBootPolicy(const UByteArray & bootPolic
// v2
try {
std::istringstream is(std::string(bootPolicy.constData(), bootPolicy.size()));
memstream is(bootPolicy.constData(), bootPolicy.size());
is.seekg(localOffset, is.beg);
kaitai::kstream ks(&is);
intel_acbp_v2_t parsed(&ks); // This already verified the version to be >= 0x20