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transmission/libtransmission/variant.cc

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// This file Copyright © 2008-2023 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <algorithm> // std::sort
#include <cstring>
#include <stack>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
#ifdef _WIN32
#include <share.h>
#endif
#include <fmt/core.h>
#define LIBTRANSMISSION_VARIANT_MODULE
#include "libtransmission/transmission.h"
#include "libtransmission/error.h"
#include "libtransmission/file.h"
#include "libtransmission/log.h"
#include "libtransmission/quark.h"
#include "libtransmission/tr-assert.h"
#include "libtransmission/utils.h"
#include "libtransmission/variant-common.h"
#include "libtransmission/variant.h"
using namespace std::literals;
namespace
{
constexpr bool tr_variantIsContainer(tr_variant const* v)
{
return tr_variantIsList(v) || tr_variantIsDict(v);
}
// ---
auto constexpr StringInit = tr_variant_string{
TR_STRING_TYPE_QUARK,
0,
{},
};
void tr_variant_string_clear(struct tr_variant_string* str)
{
if (str->type == TR_STRING_TYPE_HEAP)
{
delete[] const_cast<char*>(str->str.str);
}
*str = StringInit;
}
/* returns a const pointer to the variant's string */
constexpr char const* tr_variant_string_get_string(struct tr_variant_string const* str)
{
switch (str->type)
{
case TR_STRING_TYPE_BUF:
return str->str.buf;
case TR_STRING_TYPE_HEAP:
case TR_STRING_TYPE_QUARK:
case TR_STRING_TYPE_VIEW:
return str->str.str;
default:
return nullptr;
}
}
void tr_variant_string_set_quark(struct tr_variant_string* str, tr_quark quark)
{
tr_variant_string_clear(str);
str->type = TR_STRING_TYPE_QUARK;
auto const sv = tr_quark_get_string_view(quark);
str->str.str = std::data(sv);
str->len = std::size(sv);
}
void tr_variant_string_set_string(struct tr_variant_string* str, std::string_view in)
{
tr_variant_string_clear(str);
auto const* const bytes = std::data(in);
auto const len = std::size(in);
if (len < sizeof(str->str.buf))
{
str->type = TR_STRING_TYPE_BUF;
if (len > 0)
{
std::copy_n(bytes, len, str->str.buf);
}
str->str.buf[len] = '\0';
str->len = len;
}
else
{
auto* tmp = new char[len + 1];
std::copy_n(bytes, len, tmp);
tmp[len] = '\0';
str->type = TR_STRING_TYPE_HEAP;
str->str.str = tmp;
str->len = len;
}
}
// ---
constexpr char const* getStr(tr_variant const* v)
{
TR_ASSERT(tr_variantIsString(v));
return tr_variant_string_get_string(&v->val.s);
}
constexpr int dictIndexOf(tr_variant const* dict, tr_quark key)
{
if (tr_variantIsDict(dict))
{
for (size_t i = 0; i < dict->val.l.count; ++i)
{
if (dict->val.l.vals[i].key == key)
{
return (int)i;
}
}
}
return -1;
}
bool dictFindType(tr_variant* dict, tr_quark key, int type, tr_variant** setme)
{
*setme = tr_variantDictFind(dict, key);
return tr_variantIsType(*setme, type);
}
tr_variant* containerReserve(tr_variant* v, size_t count)
{
TR_ASSERT(tr_variantIsContainer(v));
if (size_t const needed = v->val.l.count + count; needed > v->val.l.alloc)
{
/* scale the alloc size in powers-of-2 */
size_t n = v->val.l.alloc != 0 ? v->val.l.alloc : 8;
while (n < needed)
{
n *= 2U;
}
auto* vals = new tr_variant[n];
std::copy_n(v->val.l.vals, v->val.l.count, vals);
delete[] v->val.l.vals;
v->val.l.vals = vals;
v->val.l.alloc = n;
}
return v->val.l.vals + v->val.l.count;
}
tr_variant* dictFindOrAdd(tr_variant* dict, tr_quark key, int type)
{
/* see if it already exists, and if so, try to reuse it */
tr_variant* child = tr_variantDictFind(dict, key);
if (child != nullptr)
{
if (!tr_variantIsType(child, type))
{
tr_variantDictRemove(dict, key);
child = nullptr;
}
else if (child->type == TR_VARIANT_TYPE_STR)
{
tr_variant_string_clear(&child->val.s);
}
}
/* if it doesn't exist, create it */
if (child == nullptr)
{
child = tr_variantDictAdd(dict, key);
}
return child;
}
} // namespace
tr_variant* tr_variantDictFind(tr_variant* dict, tr_quark key)
{
auto const i = dictIndexOf(dict, key);
return i < 0 ? nullptr : dict->val.l.vals + i;
}
tr_variant* tr_variantListChild(tr_variant* list, size_t pos)
{
if (tr_variantIsList(list) && pos < list->val.l.count)
{
return list->val.l.vals + pos;
}
return {};
}
bool tr_variantListRemove(tr_variant* list, size_t pos)
{
if (!tr_variantIsList(list) && pos < list->val.l.count)
{
return false;
}
auto& vals = list->val.l.vals;
auto& count = list->val.l.count;
tr_variantClear(&vals[pos]);
std::move(vals + pos + 1, vals + count, vals + pos);
--count;
vals[count] = {};
return true;
}
bool tr_variantGetInt(tr_variant const* v, int64_t* setme)
{
bool success = false;
if (tr_variantIsInt(v))
{
if (setme != nullptr)
{
*setme = v->val.i;
}
success = true;
}
if (!success && tr_variantIsBool(v))
{
if (setme != nullptr)
{
*setme = v->val.b ? 1 : 0;
}
success = true;
}
return success;
}
bool tr_variantGetStrView(tr_variant const* v, std::string_view* setme)
{
if (!tr_variantIsString(v))
{
return false;
}
char const* const str = tr_variant_string_get_string(&v->val.s);
size_t const len = v->val.s.len;
*setme = std::string_view{ str, len };
return true;
}
bool tr_variantGetRaw(tr_variant const* v, std::byte const** setme_raw, size_t* setme_len)
{
bool const success = tr_variantIsString(v);
if (success)
{
*setme_raw = reinterpret_cast<std::byte const*>(getStr(v));
*setme_len = v->val.s.len;
}
return success;
}
bool tr_variantGetRaw(tr_variant const* v, uint8_t const** setme_raw, size_t* setme_len)
{
bool const success = tr_variantIsString(v);
if (success)
{
*setme_raw = reinterpret_cast<uint8_t const*>(getStr(v));
*setme_len = v->val.s.len;
}
return success;
}
bool tr_variantGetBool(tr_variant const* v, bool* setme)
{
if (tr_variantIsBool(v))
{
*setme = v->val.b;
return true;
}
if (tr_variantIsInt(v) && (v->val.i == 0 || v->val.i == 1))
{
*setme = v->val.i != 0;
return true;
}
if (auto sv = std::string_view{}; tr_variantGetStrView(v, &sv))
{
if (sv == "true"sv)
{
*setme = true;
return true;
}
if (sv == "false"sv)
{
*setme = false;
return true;
}
}
return false;
}
bool tr_variantGetReal(tr_variant const* v, double* setme)
{
bool success = false;
if (tr_variantIsReal(v))
{
*setme = v->val.d;
success = true;
}
if (!success && tr_variantIsInt(v))
{
*setme = (double)v->val.i;
success = true;
}
if (!success && tr_variantIsString(v))
{
if (auto sv = std::string_view{}; tr_variantGetStrView(v, &sv))
{
if (auto d = tr_parseNum<double>(sv); d)
{
*setme = *d;
success = true;
}
}
}
return success;
}
bool tr_variantDictFindInt(tr_variant* dict, tr_quark key, int64_t* setme)
{
tr_variant const* child = tr_variantDictFind(dict, key);
return tr_variantGetInt(child, setme);
}
bool tr_variantDictFindBool(tr_variant* dict, tr_quark key, bool* setme)
{
tr_variant const* child = tr_variantDictFind(dict, key);
return tr_variantGetBool(child, setme);
}
bool tr_variantDictFindReal(tr_variant* dict, tr_quark key, double* setme)
{
tr_variant const* child = tr_variantDictFind(dict, key);
return tr_variantGetReal(child, setme);
}
bool tr_variantDictFindStrView(tr_variant* dict, tr_quark key, std::string_view* setme)
{
tr_variant const* const child = tr_variantDictFind(dict, key);
return tr_variantGetStrView(child, setme);
}
bool tr_variantDictFindList(tr_variant* dict, tr_quark key, tr_variant** setme)
{
return dictFindType(dict, key, TR_VARIANT_TYPE_LIST, setme);
}
bool tr_variantDictFindDict(tr_variant* dict, tr_quark key, tr_variant** setme)
{
return dictFindType(dict, key, TR_VARIANT_TYPE_DICT, setme);
}
bool tr_variantDictFindRaw(tr_variant* dict, tr_quark key, uint8_t const** setme_raw, size_t* setme_len)
{
auto const* child = tr_variantDictFind(dict, key);
return tr_variantGetRaw(child, setme_raw, setme_len);
}
bool tr_variantDictFindRaw(tr_variant* dict, tr_quark key, std::byte const** setme_raw, size_t* setme_len)
{
auto const* child = tr_variantDictFind(dict, key);
return tr_variantGetRaw(child, setme_raw, setme_len);
}
// ---
void tr_variantInitRaw(tr_variant* initme, void const* value, size_t value_len)
{
tr_variantInit(initme, TR_VARIANT_TYPE_STR);
tr_variant_string_set_string(&initme->val.s, { static_cast<char const*>(value), value_len });
}
void tr_variantInitQuark(tr_variant* initme, tr_quark value)
{
tr_variantInit(initme, TR_VARIANT_TYPE_STR);
tr_variant_string_set_quark(&initme->val.s, value);
}
void tr_variantInitStr(tr_variant* initme, std::string_view value)
{
tr_variantInit(initme, TR_VARIANT_TYPE_STR);
tr_variant_string_set_string(&initme->val.s, value);
}
void tr_variantInitList(tr_variant* initme, size_t reserve_count)
{
tr_variantInit(initme, TR_VARIANT_TYPE_LIST);
tr_variantListReserve(initme, reserve_count);
}
void tr_variantListReserve(tr_variant* list, size_t count)
{
TR_ASSERT(tr_variantIsList(list));
containerReserve(list, count);
}
void tr_variantInitDict(tr_variant* initme, size_t reserve_count)
{
tr_variantInit(initme, TR_VARIANT_TYPE_DICT);
tr_variantDictReserve(initme, reserve_count);
}
void tr_variantDictReserve(tr_variant* dict, size_t reserve_count)
{
TR_ASSERT(tr_variantIsDict(dict));
containerReserve(dict, reserve_count);
}
tr_variant* tr_variantListAdd(tr_variant* list)
{
TR_ASSERT(tr_variantIsList(list));
tr_variant* child = containerReserve(list, 1);
++list->val.l.count;
child->key = 0;
tr_variantInit(child, TR_VARIANT_TYPE_INT);
return child;
}
tr_variant* tr_variantListAddInt(tr_variant* list, int64_t value)
{
tr_variant* child = tr_variantListAdd(list);
tr_variantInitInt(child, value);
return child;
}
tr_variant* tr_variantListAddReal(tr_variant* list, double value)
{
tr_variant* child = tr_variantListAdd(list);
tr_variantInitReal(child, value);
return child;
}
tr_variant* tr_variantListAddBool(tr_variant* list, bool value)
{
tr_variant* child = tr_variantListAdd(list);
tr_variantInitBool(child, value);
return child;
}
tr_variant* tr_variantListAddStr(tr_variant* list, std::string_view value)
{
tr_variant* child = tr_variantListAdd(list);
tr_variantInitStr(child, value);
return child;
}
tr_variant* tr_variantListAddStrView(tr_variant* list, std::string_view value)
{
tr_variant* child = tr_variantListAdd(list);
tr_variantInitStrView(child, value);
return child;
}
tr_variant* tr_variantListAddQuark(tr_variant* list, tr_quark value)
{
tr_variant* child = tr_variantListAdd(list);
tr_variantInitQuark(child, value);
return child;
}
tr_variant* tr_variantListAddRaw(tr_variant* list, void const* value, size_t value_len)
{
tr_variant* child = tr_variantListAdd(list);
tr_variantInitRaw(child, value, value_len);
return child;
}
tr_variant* tr_variantListAddList(tr_variant* list, size_t reserve_count)
{
tr_variant* child = tr_variantListAdd(list);
tr_variantInitList(child, reserve_count);
return child;
}
tr_variant* tr_variantListAddDict(tr_variant* list, size_t reserve_count)
{
tr_variant* child = tr_variantListAdd(list);
tr_variantInitDict(child, reserve_count);
return child;
}
tr_variant* tr_variantDictAdd(tr_variant* dict, tr_quark key)
{
TR_ASSERT(tr_variantIsDict(dict));
tr_variant* val = containerReserve(dict, 1);
++dict->val.l.count;
val->key = key;
tr_variantInit(val, TR_VARIANT_TYPE_INT);
return val;
}
tr_variant* tr_variantDictAddInt(tr_variant* dict, tr_quark key, int64_t val)
{
tr_variant* child = dictFindOrAdd(dict, key, TR_VARIANT_TYPE_INT);
tr_variantInitInt(child, val);
return child;
}
tr_variant* tr_variantDictAddBool(tr_variant* dict, tr_quark key, bool val)
{
tr_variant* child = dictFindOrAdd(dict, key, TR_VARIANT_TYPE_BOOL);
tr_variantInitBool(child, val);
return child;
}
tr_variant* tr_variantDictAddReal(tr_variant* dict, tr_quark key, double val)
{
tr_variant* child = dictFindOrAdd(dict, key, TR_VARIANT_TYPE_REAL);
tr_variantInitReal(child, val);
return child;
}
tr_variant* tr_variantDictAddQuark(tr_variant* dict, tr_quark key, tr_quark const val)
{
tr_variant* child = dictFindOrAdd(dict, key, TR_VARIANT_TYPE_STR);
tr_variantInitQuark(child, val);
return child;
}
tr_variant* tr_variantDictAddStr(tr_variant* dict, tr_quark key, std::string_view val)
{
tr_variant* child = dictFindOrAdd(dict, key, TR_VARIANT_TYPE_STR);
tr_variantInitStr(child, val);
return child;
}
tr_variant* tr_variantDictAddStrView(tr_variant* dict, tr_quark key, std::string_view val)
{
tr_variant* child = dictFindOrAdd(dict, key, TR_VARIANT_TYPE_STR);
tr_variantInitStrView(child, val);
return child;
}
tr_variant* tr_variantDictAddRaw(tr_variant* dict, tr_quark key, void const* value, size_t len)
{
tr_variant* child = dictFindOrAdd(dict, key, TR_VARIANT_TYPE_STR);
tr_variantInitRaw(child, value, len);
return child;
}
tr_variant* tr_variantDictAddList(tr_variant* dict, tr_quark key, size_t reserve_count)
{
tr_variant* child = tr_variantDictAdd(dict, key);
tr_variantInitList(child, reserve_count);
return child;
}
tr_variant* tr_variantDictAddDict(tr_variant* dict, tr_quark key, size_t reserve_count)
{
tr_variant* child = tr_variantDictAdd(dict, key);
tr_variantInitDict(child, reserve_count);
return child;
}
tr_variant* tr_variantDictSteal(tr_variant* dict, tr_quark key, tr_variant* value)
{
tr_variant* child = tr_variantDictAdd(dict, key);
*child = *value;
child->key = key;
tr_variantInit(value, value->type);
return child;
}
bool tr_variantDictRemove(tr_variant* dict, tr_quark key)
{
bool removed = false;
if (int const i = dictIndexOf(dict, key); i >= 0)
{
int const last = (int)dict->val.l.count - 1;
tr_variantClear(&dict->val.l.vals[i]);
if (i != last)
{
dict->val.l.vals[i] = dict->val.l.vals[last];
}
--dict->val.l.count;
removed = true;
}
return removed;
}
// --- BENC WALKING
class WalkNode
{
public:
explicit WalkNode(tr_variant const* v_in)
{
assign(v_in);
}
tr_variant const* nextChild()
{
if (!tr_variantIsContainer(&v) || (child_index >= v.val.l.count))
{
return nullptr;
}
auto idx = child_index++;
if (!sorted.empty())
{
idx = sorted[idx];
}
return v.val.l.vals + idx;
}
bool is_visited = false;
// shallow bitwise copy of the variant passed to the constructor
tr_variant v = {};
protected:
friend class VariantWalker;
void assign(tr_variant const* v_in)
{
is_visited = false;
v = *v_in;
child_index = 0;
sorted.clear();
}
struct ByKey
{
std::string_view key;
size_t idx = {};
};
template<typename ByKeyContainer>
void sort(ByKeyContainer& sortbuf)
{
if (!tr_variantIsDict(&v))
{
return;
}
auto const n = v.val.l.count;
auto const* children = v.val.l.vals;
sortbuf.resize(n);
for (size_t i = 0; i < n; ++i)
{
sortbuf[i] = { tr_quark_get_string_view(children[i].key), i };
}
std::sort(std::begin(sortbuf), std::end(sortbuf), [](ByKey const& a, ByKey const& b) { return a.key < b.key; });
// keep the sorted indices
sorted.resize(n);
for (size_t i = 0; i < n; ++i)
{
sorted[i] = sortbuf[i].idx;
}
}
private:
// When walking `v`'s children, this is the index of the next child
size_t child_index = 0;
// When `v` is a dict, this is its children's indices sorted by key.
// Bencoded dicts must be sorted, so this is useful when writing benc.
std::vector<size_t> sorted;
};
class VariantWalker
{
public:
void emplace(tr_variant const* v_in, bool sort_dicts)
{
if (size == std::size(stack))
{
stack.emplace_back(v_in);
}
else
{
stack[size].assign(v_in);
}
++size;
if (sort_dicts)
{
top().sort(sortbuf);
}
}
void pop()
{
TR_ASSERT(size > 0);
if (size > 0)
{
--size;
}
}
[[nodiscard]] bool empty() const
{
return size == 0;
}
WalkNode& top()
{
TR_ASSERT(size > 0);
return stack[size - 1];
}
private:
size_t size = 0;
std::vector<WalkNode> stack;
std::vector<WalkNode::ByKey> sortbuf;
};
/**
* This function's previous recursive implementation was
* easier to read, but was vulnerable to a smash-stacking
* attack via maliciously-crafted data. (#667)
*/
void tr_variantWalk(tr_variant const* top, struct VariantWalkFuncs const* walk_funcs, void* user_data, bool sort_dicts)
{
auto stack = VariantWalker{};
stack.emplace(top, sort_dicts);
while (!stack.empty())
{
auto& node = stack.top();
tr_variant const* v = nullptr;
if (!node.is_visited)
{
v = &node.v;
node.is_visited = true;
}
else
{
v = node.nextChild();
if (v != nullptr)
{
if (tr_variantIsDict(&node.v))
{
auto tmp = tr_variant{};
tr_variantInitQuark(&tmp, v->key);
walk_funcs->stringFunc(&tmp, user_data);
}
}
else // finished with this node
{
if (tr_variantIsContainer(&node.v))
{
walk_funcs->containerEndFunc(&node.v, user_data);
}
stack.pop();
continue;
}
}
if (v != nullptr)
{
switch (v->type)
{
case TR_VARIANT_TYPE_INT:
walk_funcs->intFunc(v, user_data);
break;
case TR_VARIANT_TYPE_BOOL:
walk_funcs->boolFunc(v, user_data);
break;
case TR_VARIANT_TYPE_REAL:
walk_funcs->realFunc(v, user_data);
break;
case TR_VARIANT_TYPE_STR:
walk_funcs->stringFunc(v, user_data);
break;
case TR_VARIANT_TYPE_LIST:
if (v == &node.v)
{
walk_funcs->listBeginFunc(v, user_data);
}
else
{
stack.emplace(v, sort_dicts);
}
break;
case TR_VARIANT_TYPE_DICT:
if (v == &node.v)
{
walk_funcs->dictBeginFunc(v, user_data);
}
else
{
stack.emplace(v, sort_dicts);
}
break;
default:
/* did caller give us an uninitialized val? */
tr_logAddError(_("Invalid metadata"));
break;
}
}
}
}
// ---
namespace
{
namespace clear_helpers
{
void freeDummyFunc(tr_variant const* /*v*/, void* /*buf*/)
{
}
void freeStringFunc(tr_variant const* v, void* /*user_data*/)
{
tr_variant_string_clear(&const_cast<tr_variant*>(v)->val.s);
}
void freeContainerEndFunc(tr_variant const* v, void* /*user_data*/)
{
delete[] v->val.l.vals;
}
VariantWalkFuncs constexpr FreeWalkFuncs = {
freeDummyFunc, //
freeDummyFunc, //
freeDummyFunc, //
freeStringFunc, //
freeDummyFunc, //
freeDummyFunc, //
freeContainerEndFunc, //
};
} // namespace clear_helpers
} // namespace
void tr_variantClear(tr_variant* clearme)
{
using namespace clear_helpers;
if (!tr_variantIsEmpty(clearme))
{
tr_variantWalk(clearme, &FreeWalkFuncs, nullptr, false);
}
*clearme = {};
}
// ---
bool tr_variantDictChild(tr_variant* dict, size_t pos, tr_quark* key, tr_variant** setme_value)
{
TR_ASSERT(tr_variantIsDict(dict));
bool success = false;
if (tr_variantIsDict(dict) && pos < dict->val.l.count)
{
*key = dict->val.l.vals[pos].key;
*setme_value = dict->val.l.vals + pos;
success = true;
}
return success;
}
namespace
{
namespace merge_helpers
{
void tr_variantListCopy(tr_variant* target, tr_variant const* src)
{
for (size_t i = 0;; ++i)
{
auto const* const child = tr_variantListChild(const_cast<tr_variant*>(src), i);
if (child == nullptr)
{
break;
}
if (tr_variantIsBool(child))
{
auto val = bool{};
tr_variantGetBool(child, &val);
tr_variantListAddBool(target, val);
}
else if (tr_variantIsReal(child))
{
auto val = double{};
tr_variantGetReal(child, &val);
tr_variantListAddReal(target, val);
}
else if (tr_variantIsInt(child))
{
auto val = int64_t{};
tr_variantGetInt(child, &val);
tr_variantListAddInt(target, val);
}
else if (tr_variantIsString(child))
{
auto val = std::string_view{};
(void)tr_variantGetStrView(child, &val);
tr_variantListAddRaw(target, std::data(val), std::size(val));
}
else if (tr_variantIsDict(child))
{
tr_variantMergeDicts(tr_variantListAddDict(target, 0), child);
}
else if (tr_variantIsList(child))
{
tr_variantListCopy(tr_variantListAddList(target, 0), child);
}
else
{
tr_logAddWarn("tr_variantListCopy skipping item");
}
}
}
constexpr size_t tr_variantDictSize(tr_variant const* dict)
{
return tr_variantIsDict(dict) ? dict->val.l.count : 0;
}
} // namespace merge_helpers
} // namespace
void tr_variantMergeDicts(tr_variant* target, tr_variant const* source)
{
using namespace merge_helpers;
TR_ASSERT(tr_variantIsDict(target));
TR_ASSERT(tr_variantIsDict(source));
size_t const source_count = tr_variantDictSize(source);
tr_variantDictReserve(target, source_count + tr_variantDictSize(target));
for (size_t i = 0; i < source_count; ++i)
{
auto key = tr_quark{};
tr_variant* child = nullptr;
if (tr_variantDictChild(const_cast<tr_variant*>(source), i, &key, &child))
{
tr_variant* t = nullptr;
// if types differ, ensure that target will overwrite source
auto const* const target_child = tr_variantDictFind(target, key);
if ((target_child != nullptr) && !tr_variantIsType(target_child, child->type))
{
tr_variantDictRemove(target, key);
}
if (tr_variantIsBool(child))
{
auto val = bool{};
tr_variantGetBool(child, &val);
tr_variantDictAddBool(target, key, val);
}
else if (tr_variantIsReal(child))
{
auto val = double{};
tr_variantGetReal(child, &val);
tr_variantDictAddReal(target, key, val);
}
else if (tr_variantIsInt(child))
{
auto val = int64_t{};
tr_variantGetInt(child, &val);
tr_variantDictAddInt(target, key, val);
}
else if (tr_variantIsString(child))
{
auto val = std::string_view{};
(void)tr_variantGetStrView(child, &val);
tr_variantDictAddRaw(target, key, std::data(val), std::size(val));
}
else if (tr_variantIsDict(child) && tr_variantDictFindDict(target, key, &t))
{
tr_variantMergeDicts(t, child);
}
else if (tr_variantIsList(child))
{
if (tr_variantDictFind(target, key) == nullptr)
{
tr_variantListCopy(tr_variantDictAddList(target, key, tr_variantListSize(child)), child);
}
}
else if (tr_variantIsDict(child))
{
tr_variant* target_dict = tr_variantDictFind(target, key);
if (target_dict == nullptr)
{
target_dict = tr_variantDictAddDict(target, key, tr_variantDictSize(child));
}
if (tr_variantIsDict(target_dict))
{
tr_variantMergeDicts(target_dict, child);
}
}
else
{
tr_logAddDebug(fmt::format("tr_variantMergeDicts skipping '{}'", tr_quark_get_string_view(key)));
}
}
}
}
// ---
std::string tr_variantToStr(tr_variant const* v, tr_variant_fmt fmt)
{
switch (fmt)
{
case TR_VARIANT_FMT_JSON:
return tr_variantToStrJson(v, false);
case TR_VARIANT_FMT_JSON_LEAN:
return tr_variantToStrJson(v, true);
default: // TR_VARIANT_FMT_BENC:
return tr_variantToStrBenc(v);
}
}
int tr_variantToFile(tr_variant const* v, tr_variant_fmt fmt, std::string_view filename)
{
auto error_code = int{ 0 };
auto const contents = tr_variantToStr(v, fmt);
tr_error* error = nullptr;
tr_saveFile(filename, contents, &error);
if (error != nullptr)
{
tr_logAddError(fmt::format(
_("Couldn't save '{path}': {error} ({error_code})"),
fmt::arg("path", filename),
fmt::arg("error", error->message),
fmt::arg("error_code", error->code)));
error_code = error->code;
tr_error_clear(&error);
}
return error_code;
}
// ---
bool tr_variantFromBuf(tr_variant* setme, int opts, std::string_view buf, char const** setme_end, tr_error** error)
{
// supported formats: benc, json
TR_ASSERT((opts & (TR_VARIANT_PARSE_BENC | TR_VARIANT_PARSE_JSON)) != 0);
*setme = {};
auto const success = ((opts & TR_VARIANT_PARSE_BENC) != 0) ? tr_variantParseBenc(*setme, opts, buf, setme_end, error) :
tr_variantParseJson(*setme, opts, buf, setme_end, error);
if (!success)
{
tr_variantClear(setme);
}
return success;
}
bool tr_variantFromFile(tr_variant* setme, tr_variant_parse_opts opts, std::string_view filename, tr_error** error)
{
// can't do inplace when this function is allocating & freeing the memory...
TR_ASSERT((opts & TR_VARIANT_PARSE_INPLACE) == 0);
if (auto buf = std::vector<char>{}; tr_loadFile(filename, buf, error))
{
return tr_variantFromBuf(setme, opts, buf, nullptr, error);
}
return false;
}
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