/src/assimp/code/AssetLib/FBX/FBXParser.cpp

Source
/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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All rights reserved.

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* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
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  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the assimp team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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*/

/** @file  FBXParser.cpp
 *  @brief Implementation of the FBX parser and the rudimentary DOM that we use
 */

#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER

#include "Common/Compression.h"

#include "FBXTokenizer.h"
#include "FBXParser.h"
#include "FBXUtil.h"

#include <assimp/ParsingUtils.h>
#include <assimp/fast_atof.h>
#include <assimp/ByteSwapper.h>
#include <assimp/DefaultLogger.hpp>

#include <iostream>

using namespace Assimp;
using namespace Assimp::FBX;

namespace {

    // ------------------------------------------------------------------------------------------------
    // signal parse error, this is always unrecoverable. Throws DeadlyImportError.
    AI_WONT_RETURN void ParseError(const std::string& message, const Token& token) AI_WONT_RETURN_SUFFIX;
    AI_WONT_RETURN void ParseError(const std::string& message, const Token& token)
    {
        throw DeadlyImportError("FBX-Parser", Util::GetTokenText(&token), message);
    }

    // ------------------------------------------------------------------------------------------------
    AI_WONT_RETURN void ParseError(const std::string &message, const Element *element = nullptr) AI_WONT_RETURN_SUFFIX;
    AI_WONT_RETURN void ParseError(const std::string& message, const Element* element)
    {
        if(element) {
            ParseError(message,element->KeyToken());
        }
        throw DeadlyImportError("FBX-Parser ", message);
    }


    // ------------------------------------------------------------------------------------------------
    AI_WONT_RETURN void ParseError(const std::string& message, TokenPtr token) AI_WONT_RETURN_SUFFIX;
    void ParseError(const std::string& message, TokenPtr token)
    {
        if(token) {
            ParseError(message, *token);
        }
        ParseError(message);
    }

    // Initially, we did reinterpret_cast, breaking strict aliasing rules.
    // This actually caused trouble on Android, so let's be safe this time.
    // https://github.com/assimp/assimp/issues/24
    template <typename T>
    T SafeParse(const char* data, const char* end) {
        // Actual size validation happens during Tokenization so
        // this is valid as an assertion.
        (void)(end);
        ai_assert(static_cast<size_t>(end - data) >= sizeof(T));
        T result = static_cast<T>(0);
        ::memcpy(&result, data, sizeof(T));
        return result;
    }
}

namespace Assimp {
namespace FBX {

// ------------------------------------------------------------------------------------------------
Element::Element(const Token& key_token, Parser& parser) :
    key_token(key_token), compound(nullptr)
{
    TokenPtr n = nullptr;
    StackAllocator &allocator = parser.GetAllocator();
    do {
        n = parser.AdvanceToNextToken();
        if(!n) {
            ParseError("unexpected end of file, expected closing bracket",parser.LastToken());
        }

        if (n->Type() == TokenType_DATA) {
            tokens.push_back(n);
      TokenPtr prev = n;
            n = parser.AdvanceToNextToken();
            if(!n) {
                ParseError("unexpected end of file, expected bracket, comma or key",parser.LastToken());
            }

      const TokenType ty = n->Type();

      // some exporters are missing a comma on the next line
      if (ty == TokenType_DATA && prev->Type() == TokenType_DATA && (n->Line() == prev->Line() + 1)) {
        tokens.push_back(n);
        continue;
      }

            if (ty != TokenType_OPEN_BRACKET && ty != TokenType_CLOSE_BRACKET && ty != TokenType_COMMA && ty != TokenType_KEY) {
                ParseError("unexpected token; expected bracket, comma or key",n);
            }
        }

        if (n->Type() == TokenType_OPEN_BRACKET) {
            compound = new_Scope(parser);

            // current token should be a TOK_CLOSE_BRACKET
            n = parser.CurrentToken();
            ai_assert(n);

            if (n->Type() != TokenType_CLOSE_BRACKET) {
                ParseError("expected closing bracket",n);
            }

            parser.AdvanceToNextToken();
            return;
        }
    }
    while(n->Type() != TokenType_KEY && n->Type() != TokenType_CLOSE_BRACKET);
}

// ------------------------------------------------------------------------------------------------
Element::~Element()
{
    if (compound) {
        delete_Scope(compound);
    }

     // no need to delete tokens, they are owned by the parser
}

Scope::Scope(Parser& parser,bool topLevel)
{
    if(!topLevel) {
        TokenPtr t = parser.CurrentToken();
        if (t->Type() != TokenType_OPEN_BRACKET) {
            ParseError("expected open bracket",t);
        }
    }

    StackAllocator &allocator = parser.GetAllocator();
    TokenPtr n = parser.AdvanceToNextToken();
    if (n == nullptr) {
        ParseError("unexpected end of file");
    }

    // note: empty scopes are allowed
    while(n->Type() != TokenType_CLOSE_BRACKET) {
        if (n->Type() != TokenType_KEY) {
            ParseError("unexpected token, expected TOK_KEY",n);
        }

        const std::string& str = n->StringContents();
        if (str.empty()) {
            ParseError("unexpected content: empty string.");
        }

        auto *element = new_Element(*n, parser);

        // Element() should stop at the next Key token (or right after a Close token)
        n = parser.CurrentToken();
        if (n == nullptr) {
            if (topLevel) {
                elements.insert(ElementMap::value_type(str, element));
                return;
            }
            delete_Element(element);
            ParseError("unexpected end of file",parser.LastToken());
        } else {
            elements.insert(ElementMap::value_type(str, element));
        }
    }
}

// ------------------------------------------------------------------------------------------------
Scope::~Scope()
{
  // This collection does not own the memory for the elements, but we need to call their d'tor:

    for (ElementMap::value_type &v : elements) {
        delete_Element(v.second);
    }
}

// ------------------------------------------------------------------------------------------------
Parser::Parser(const TokenList &tokens, StackAllocator &allocator, bool is_binary) :
        tokens(tokens), allocator(allocator), last(), current(), cursor(tokens.begin()), is_binary(is_binary)
{
    ASSIMP_LOG_DEBUG("Parsing FBX tokens");
    root = new_Scope(*this, true);
}

// ------------------------------------------------------------------------------------------------
Parser::~Parser()
{
    delete_Scope(root);
}

// ------------------------------------------------------------------------------------------------
TokenPtr Parser::AdvanceToNextToken()
{
    last = current;
    if (cursor == tokens.end()) {
        current = nullptr;
    } else {
        current = *cursor++;
    }
    return current;
}

// ------------------------------------------------------------------------------------------------
TokenPtr Parser::CurrentToken() const
{
    return current;
}

// ------------------------------------------------------------------------------------------------
TokenPtr Parser::LastToken() const
{
    return last;
}

// ------------------------------------------------------------------------------------------------
uint64_t ParseTokenAsID(const Token& t, const char*& err_out)
{
    err_out = nullptr;

    if (t.Type() != TokenType_DATA) {
        err_out = "expected TOK_DATA token";
        return 0L;
    }

    if(t.IsBinary())
    {
        const char* data = t.begin();
        if (data[0] != 'L') {
            err_out = "failed to parse ID, unexpected data type, expected L(ong) (binary)";
            return 0L;
        }

        BE_NCONST uint64_t id = SafeParse<uint64_t>(data+1, t.end());
        AI_SWAP8(id);
        return id;
    }

    // XXX: should use size_t here
    unsigned int length = static_cast<unsigned int>(t.end() - t.begin());
    ai_assert(length > 0);

    const char* out = nullptr;
    const uint64_t id = strtoul10_64(t.begin(),&out,&length);
    if (out > t.end()) {
        err_out = "failed to parse ID (text)";
        return 0L;
    }

    return id;
}

// ------------------------------------------------------------------------------------------------
size_t ParseTokenAsDim(const Token& t, const char*& err_out)
{
    // same as ID parsing, except there is a trailing asterisk
    err_out = nullptr;

    if (t.Type() != TokenType_DATA) {
        err_out = "expected TOK_DATA token";
        return 0;
    }

    if(t.IsBinary())
    {
        const char* data = t.begin();
        if (data[0] != 'L') {
            err_out = "failed to parse ID, unexpected data type, expected L(ong) (binary)";
            return 0;
        }

        BE_NCONST uint64_t id = SafeParse<uint64_t>(data+1, t.end());
        AI_SWAP8(id);
        return static_cast<size_t>(id);
    }

    if(*t.begin() != '*') {
        err_out = "expected asterisk before array dimension";
        return 0;
    }

    // XXX: should use size_t here
    unsigned int length = static_cast<unsigned int>(t.end() - t.begin());
    if(length == 0) {
        err_out = "expected valid integer number after asterisk";
        return 0;
    }

    const char* out = nullptr;
    const size_t id = static_cast<size_t>(strtoul10_64(t.begin() + 1,&out,&length));
    if (out > t.end()) {
        err_out = "failed to parse ID";
        return 0;
    }

    return id;
}


// ------------------------------------------------------------------------------------------------
float ParseTokenAsFloat(const Token& t, const char*& err_out)
{
    err_out = nullptr;

    if (t.Type() != TokenType_DATA) {
        err_out = "expected TOK_DATA token";
        return 0.0f;
    }

    if(t.IsBinary())
    {
        const char* data = t.begin();
        if (data[0] != 'F' && data[0] != 'D') {
            err_out = "failed to parse F(loat) or D(ouble), unexpected data type (binary)";
            return 0.0f;
        }

        if (data[0] == 'F') {
            BE_NCONST float id = SafeParse<float>(data+1, t.end());
            AI_SWAP4(id);
            return id;
        }
        else {
            BE_NCONST double id = SafeParse<double>(data+1, t.end());
            AI_SWAP8(id);
            return static_cast<float>(id);
        }
    }

    // need to copy the input string to a temporary buffer
    // first - next in the fbx token stream comes ',',
    // which fast_atof could interpret as decimal point.
#define MAX_FLOAT_LENGTH 31
    const size_t length = static_cast<size_t>(t.end()-t.begin());
    if (length > MAX_FLOAT_LENGTH) {
        return 0.f;
    }

    char temp[MAX_FLOAT_LENGTH + 1];
    std::copy(t.begin(), t.end(), temp);
    temp[std::min(static_cast<size_t>(MAX_FLOAT_LENGTH),length)] = '\0';

    return fast_atof(temp);
}


// ------------------------------------------------------------------------------------------------
int ParseTokenAsInt(const Token& t, const char*& err_out)
{
    err_out = nullptr;

    if (t.Type() != TokenType_DATA) {
        err_out = "expected TOK_DATA token";
        return 0;
    }

    if(t.IsBinary())
    {
        const char* data = t.begin();
        if (data[0] != 'I') {
            err_out = "failed to parse I(nt), unexpected data type (binary)";
            return 0;
        }

        BE_NCONST int32_t ival = SafeParse<int32_t>(data+1, t.end());
        AI_SWAP4(ival);
        return static_cast<int>(ival);
    }

    ai_assert(static_cast<size_t>(t.end() - t.begin()) > 0);

    const char* out;
    const int intval = strtol10(t.begin(),&out);
    if (out != t.end()) {
        err_out = "failed to parse ID";
        return 0;
    }

    return intval;
}


// ------------------------------------------------------------------------------------------------
int64_t ParseTokenAsInt64(const Token& t, const char*& err_out)
{
    err_out = nullptr;

    if (t.Type() != TokenType_DATA) {
        err_out = "expected TOK_DATA token";
        return 0L;
    }

    if (t.IsBinary())
    {
        const char* data = t.begin();
        if (data[0] != 'L') {
            err_out = "failed to parse Int64, unexpected data type";
            return 0L;
        }

        BE_NCONST int64_t id = SafeParse<int64_t>(data + 1, t.end());
        AI_SWAP8(id);
        return id;
    }

    // XXX: should use size_t here
    unsigned int length = static_cast<unsigned int>(t.end() - t.begin());
    ai_assert(length > 0);

    const char* out = nullptr;
    const int64_t id = strtol10_64(t.begin(), &out, &length);
    if (out > t.end()) {
        err_out = "failed to parse Int64 (text)";
        return 0L;
    }

    return id;
}

// ------------------------------------------------------------------------------------------------
std::string ParseTokenAsString(const Token& t, const char*& err_out)
{
    err_out = nullptr;

    if (t.Type() != TokenType_DATA) {
        err_out = "expected TOK_DATA token";
        return std::string();
    }

    if(t.IsBinary())
    {
        const char* data = t.begin();
        if (data[0] != 'S') {
            err_out = "failed to parse S(tring), unexpected data type (binary)";
            return std::string();
        }

        // read string length
        BE_NCONST int32_t len = SafeParse<int32_t>(data+1, t.end());
        AI_SWAP4(len);

        ai_assert(t.end() - data == 5 + len);
        return std::string(data + 5, len);
    }

    const size_t length = static_cast<size_t>(t.end() - t.begin());
    if(length < 2) {
        err_out = "token is too short to hold a string";
        return std::string();
    }

    const char* s = t.begin(), *e = t.end() - 1;
    if (*s != '\"' || *e != '\"') {
        err_out = "expected double quoted string";
        return std::string();
    }

    return std::string(s+1,length-2);
}


namespace {

// ------------------------------------------------------------------------------------------------
// read the type code and element count of a binary data array and stop there
void ReadBinaryDataArrayHead(const char*& data, const char* end, char& type, uint32_t& count,
    const Element& el)
{
    if (static_cast<size_t>(end-data) < 5) {
        ParseError("binary data array is too short, need five (5) bytes for type signature and element count",&el);
    }

    // data type
    type = *data;

    // read number of elements
    BE_NCONST uint32_t len = SafeParse<uint32_t>(data+1, end);
    AI_SWAP4(len);

    count = len;
    data += 5;
}


// ------------------------------------------------------------------------------------------------
// read binary data array, assume cursor points to the 'compression mode' field (i.e. behind the header)
void ReadBinaryDataArray(char type, uint32_t count, const char*& data, const char* end,
        std::vector<char>& buff, const Element& /*el*/) {
    BE_NCONST uint32_t encmode = SafeParse<uint32_t>(data, end);
    AI_SWAP4(encmode);
    data += 4;

    // next comes the compressed length
    BE_NCONST uint32_t comp_len = SafeParse<uint32_t>(data, end);
    AI_SWAP4(comp_len);
    data += 4;

    ai_assert(data + comp_len == end);

    // determine the length of the uncompressed data by looking at the type signature
    uint32_t stride = 0;
    switch(type)
    {
        case 'f':
        case 'i':
            stride = 4;
            break;

        case 'd':
        case 'l':
            stride = 8;
            break;

        default:
            ai_assert(false);
    };

    const uint32_t full_length = stride * count;
    buff.resize(full_length);

    if(encmode == 0) {
        ai_assert(full_length == comp_len);

        // plain data, no compression
        std::copy(data, end, buff.begin());
    }
    else if(encmode == 1) {
        // zlib/deflate, next comes ZIP head (0x78 0x01)
        // see http://www.ietf.org/rfc/rfc1950.txt
         Compression compress;
        if (compress.open(Compression::Format::Binary, Compression::FlushMode::Finish, 0)) {
            compress.decompress(data, comp_len, buff);
            compress.close();
        }
    }
#ifdef ASSIMP_BUILD_DEBUG
    else {
        // runtime check for this happens at tokenization stage
        ai_assert(false);
    }
#endif

    data += comp_len;
    ai_assert(data == end);
}

} // !anon


// ------------------------------------------------------------------------------------------------
// read an array of float3 tuples
void ParseVectorDataArray(std::vector<aiVector3D>& out, const Element& el)
{
    out.resize( 0 );

    const TokenList& tok = el.Tokens();
    if(tok.empty()) {
        ParseError("unexpected empty element",&el);
    }

    if(tok[0]->IsBinary()) {
        const char* data = tok[0]->begin(), *end = tok[0]->end();

        char type;
        uint32_t count;
        ReadBinaryDataArrayHead(data, end, type, count, el);

        if(count % 3 != 0) {
            ParseError("number of floats is not a multiple of three (3) (binary)",&el);
        }

        if(!count) {
            return;
        }

        if (type != 'd' && type != 'f') {
            ParseError("expected float or double array (binary)",&el);
        }

        std::vector<char> buff;
        ReadBinaryDataArray(type, count, data, end, buff, el);

        ai_assert(data == end);
        uint64_t dataToRead = static_cast<uint64_t>(count) * (type == 'd' ? 8 : 4);
        if (dataToRead != buff.size()) {
            ParseError("Invalid read size (binary)",&el);
        }

        const uint32_t count3 = count / 3;
        out.reserve(count3);

        if (type == 'd') {
            const double* d = reinterpret_cast<const double*>(&buff[0]);
            for (unsigned int i = 0; i < count3; ++i, d += 3) {
                BE_NCONST double val1 = d[0];
                BE_NCONST double val2 = d[1];
                BE_NCONST double val3 = d[2];
                AI_SWAP8(val1);
                AI_SWAP8(val2);
                AI_SWAP8(val3);
                out.emplace_back(static_cast<ai_real>(val1),
                    static_cast<ai_real>(val2),
                    static_cast<ai_real>(val3));
            }
            // for debugging
            /*for ( size_t i = 0; i < out.size(); i++ ) {
                aiVector3D vec3( out[ i ] );
                std::stringstream stream;
                stream << " vec3.x = " << vec3.x << " vec3.y = " << vec3.y << " vec3.z = " << vec3.z << std::endl;
                DefaultLogger::get()->info( stream.str() );
            }*/
        }
        else if (type == 'f') {
            const float* f = reinterpret_cast<const float*>(&buff[0]);
            for (unsigned int i = 0; i < count3; ++i, f += 3) {
                BE_NCONST float val1 = f[0];
                BE_NCONST float val2 = f[1];
                BE_NCONST float val3 = f[2];
                AI_SWAP4(val1);
                AI_SWAP4(val2);
                AI_SWAP4(val3);
                out.emplace_back(val1,val2,val3);
            }
        }

        return;
    }

    const size_t dim = ParseTokenAsDim(*tok[0]);

    // may throw bad_alloc if the input is rubbish, but this need
    // not to be prevented - importing would fail but we wouldn't
    // crash since assimp handles this case properly.
    out.reserve(dim);

    const Scope& scope = GetRequiredScope(el);
    const Element& a = GetRequiredElement(scope,"a",&el);

    if (a.Tokens().size() % 3 != 0) {
        ParseError("number of floats is not a multiple of three (3)",&el);
    }
    for (TokenList::const_iterator it = a.Tokens().begin(), end = a.Tokens().end(); it != end; ) {
        aiVector3D v;
        v.x = ParseTokenAsFloat(**it++);
        v.y = ParseTokenAsFloat(**it++);
        v.z = ParseTokenAsFloat(**it++);

        out.push_back(v);
    }
}

// ------------------------------------------------------------------------------------------------
// read an array of color4 tuples
void ParseVectorDataArray(std::vector<aiColor4D>& out, const Element& el)
{
    out.resize( 0 );
    const TokenList& tok = el.Tokens();
    if(tok.empty()) {
        ParseError("unexpected empty element",&el);
    }

    if(tok[0]->IsBinary()) {
        const char* data = tok[0]->begin(), *end = tok[0]->end();

        char type;
        uint32_t count;
        ReadBinaryDataArrayHead(data, end, type, count, el);

        if(count % 4 != 0) {
            ParseError("number of floats is not a multiple of four (4) (binary)",&el);
        }

        if(!count) {
            return;
        }

        if (type != 'd' && type != 'f') {
            ParseError("expected float or double array (binary)",&el);
        }

        std::vector<char> buff;
        ReadBinaryDataArray(type, count, data, end, buff, el);

        ai_assert(data == end);
        uint64_t dataToRead = static_cast<uint64_t>(count) * (type == 'd' ? 8 : 4);
        if (dataToRead != buff.size()) {
            ParseError("Invalid read size (binary)",&el);
        }

        const uint32_t count4 = count / 4;
        out.reserve(count4);

        if (type == 'd') {
            const double* d = reinterpret_cast<const double*>(&buff[0]);
            for (unsigned int i = 0; i < count4; ++i, d += 4) {
                BE_NCONST double val1 = d[0];
                BE_NCONST double val2 = d[1];
                BE_NCONST double val3 = d[2];
                BE_NCONST double val4 = d[3];
                AI_SWAP8(val1);
                AI_SWAP8(val2);
                AI_SWAP8(val3);
                AI_SWAP8(val4);
                out.emplace_back(static_cast<float>(val1),
                    static_cast<float>(val2),
                    static_cast<float>(val3),
                    static_cast<float>(val4));
            }
        }
        else if (type == 'f') {
            const float* f = reinterpret_cast<const float*>(&buff[0]);
            for (unsigned int i = 0; i < count4; ++i, f += 4) {
                BE_NCONST float val1 = f[0];
                BE_NCONST float val2 = f[1];
                BE_NCONST float val3 = f[2];
                BE_NCONST float val4 = f[3];
                AI_SWAP4(val1);
                AI_SWAP4(val2);
                AI_SWAP4(val3);
                AI_SWAP4(val4);
                out.emplace_back(val1,val2,val3,val4);
            }
        }
        return;
    }

    const size_t dim = ParseTokenAsDim(*tok[0]);

    //  see notes in ParseVectorDataArray() above
    out.reserve(dim);

    const Scope& scope = GetRequiredScope(el);
    const Element& a = GetRequiredElement(scope,"a",&el);

    if (a.Tokens().size() % 4 != 0) {
        ParseError("number of floats is not a multiple of four (4)",&el);
    }
    for (TokenList::const_iterator it = a.Tokens().begin(), end = a.Tokens().end(); it != end; ) {
        aiColor4D v;
        v.r = ParseTokenAsFloat(**it++);
        v.g = ParseTokenAsFloat(**it++);
        v.b = ParseTokenAsFloat(**it++);
        v.a = ParseTokenAsFloat(**it++);

        out.push_back(v);
    }
}


// ------------------------------------------------------------------------------------------------
// read an array of float2 tuples
void ParseVectorDataArray(std::vector<aiVector2D>& out, const Element& el) {
    out.resize( 0 );
    const TokenList& tok = el.Tokens();
    if(tok.empty()) {
        ParseError("unexpected empty element",&el);
    }

    if(tok[0]->IsBinary()) {
        const char* data = tok[0]->begin(), *end = tok[0]->end();

        char type;
        uint32_t count;
        ReadBinaryDataArrayHead(data, end, type, count, el);

        if(count % 2 != 0) {
            ParseError("number of floats is not a multiple of two (2) (binary)",&el);
        }

        if(!count) {
            return;
        }

        if (type != 'd' && type != 'f') {
            ParseError("expected float or double array (binary)",&el);
        }

        std::vector<char> buff;
        ReadBinaryDataArray(type, count, data, end, buff, el);

        ai_assert(data == end);
        uint64_t dataToRead = static_cast<uint64_t>(count) * (type == 'd' ? 8 : 4);
        if (dataToRead != buff.size()) {
            ParseError("Invalid read size (binary)",&el);
        }

        const uint32_t count2 = count / 2;
        out.reserve(count2);

        if (type == 'd') {
            const double* d = reinterpret_cast<const double*>(&buff[0]);
            for (unsigned int i = 0; i < count2; ++i, d += 2) {
                BE_NCONST double val1 = d[0];
                BE_NCONST double val2 = d[1];
                AI_SWAP8(val1);
                AI_SWAP8(val2);
                out.emplace_back(static_cast<float>(val1),
                    static_cast<float>(val2));
            }
        } else if (type == 'f') {
            const float* f = reinterpret_cast<const float*>(&buff[0]);
            for (unsigned int i = 0; i < count2; ++i, f += 2) {
                BE_NCONST float val1 = f[0];
                BE_NCONST float val2 = f[1];
                AI_SWAP4(val1);
                AI_SWAP4(val2);
                out.emplace_back(val1,val2);
            }
        }

        return;
    }

    const size_t dim = ParseTokenAsDim(*tok[0]);

    // see notes in ParseVectorDataArray() above
    out.reserve(dim);

    const Scope& scope = GetRequiredScope(el);
    const Element& a = GetRequiredElement(scope,"a",&el);

    if (a.Tokens().size() % 2 != 0) {
        ParseError("number of floats is not a multiple of two (2)",&el);
    }
    for (TokenList::const_iterator it = a.Tokens().begin(), end = a.Tokens().end(); it != end; ) {
        aiVector2D v;
        v.x = ParseTokenAsFloat(**it++);
        v.y = ParseTokenAsFloat(**it++);

        out.push_back(v);
    }
}


// ------------------------------------------------------------------------------------------------
// read an array of ints
void ParseVectorDataArray(std::vector<int>& out, const Element& el) {
    out.resize( 0 );
    const TokenList& tok = el.Tokens();
    if(tok.empty()) {
        ParseError("unexpected empty element",&el);
    }

    if(tok[0]->IsBinary()) {
        const char* data = tok[0]->begin(), *end = tok[0]->end();

        char type;
        uint32_t count;
        ReadBinaryDataArrayHead(data, end, type, count, el);

        if(!count) {
            return;
        }

        if (type != 'i') {
            ParseError("expected int array (binary)",&el);
        }

        std::vector<char> buff;
        ReadBinaryDataArray(type, count, data, end, buff, el);

        ai_assert(data == end);
        uint64_t dataToRead = static_cast<uint64_t>(count) * 4;
        if (dataToRead != buff.size()) {
            ParseError("Invalid read size (binary)",&el);
        }

        out.reserve(count);

        const int32_t* ip = reinterpret_cast<const int32_t*>(&buff[0]);
        for (unsigned int i = 0; i < count; ++i, ++ip) {
            BE_NCONST int32_t val = *ip;
            AI_SWAP4(val);
            out.push_back(val);
        }

        return;
    }

    const size_t dim = ParseTokenAsDim(*tok[0]);

    // see notes in ParseVectorDataArray()
    out.reserve(dim);

    const Scope& scope = GetRequiredScope(el);
    const Element& a = GetRequiredElement(scope,"a",&el);

    for (TokenList::const_iterator it = a.Tokens().begin(), end = a.Tokens().end(); it != end; ) {
        const int ival = ParseTokenAsInt(**it++);
        out.push_back(ival);
    }
}


// ------------------------------------------------------------------------------------------------
// read an array of floats
void ParseVectorDataArray(std::vector<float>& out, const Element& el)
{
    out.resize( 0 );
    const TokenList& tok = el.Tokens();
    if(tok.empty()) {
        ParseError("unexpected empty element",&el);
    }

    if(tok[0]->IsBinary()) {
        const char* data = tok[0]->begin(), *end = tok[0]->end();

        char type;
        uint32_t count;
        ReadBinaryDataArrayHead(data, end, type, count, el);

        if(!count) {
            return;
        }

        if (type != 'd' && type != 'f') {
            ParseError("expected float or double array (binary)",&el);
        }

        std::vector<char> buff;
        ReadBinaryDataArray(type, count, data, end, buff, el);

        ai_assert(data == end);
        uint64_t dataToRead = static_cast<uint64_t>(count) * (type == 'd' ? 8 : 4);
        if (dataToRead != buff.size()) {
            ParseError("Invalid read size (binary)",&el);
        }

        if (type == 'd') {
            const double* d = reinterpret_cast<const double*>(&buff[0]);
            for (unsigned int i = 0; i < count; ++i, ++d) {
                BE_NCONST double val = *d;
                AI_SWAP8(val);
                out.push_back(static_cast<float>(val));
            }
        }
        else if (type == 'f') {
            const float* f = reinterpret_cast<const float*>(&buff[0]);
            for (unsigned int i = 0; i < count; ++i, ++f) {
                BE_NCONST float val = *f;
                AI_SWAP4(val);
                out.push_back(val);
            }
        }

        return;
    }

    const size_t dim = ParseTokenAsDim(*tok[0]);

    // see notes in ParseVectorDataArray()
    out.reserve(dim);

    const Scope& scope = GetRequiredScope(el);
    const Element& a = GetRequiredElement(scope,"a",&el);

    for (TokenList::const_iterator it = a.Tokens().begin(), end = a.Tokens().end(); it != end; ) {
        const float ival = ParseTokenAsFloat(**it++);
        out.push_back(ival);
    }
}

// ------------------------------------------------------------------------------------------------
// read an array of uints
void ParseVectorDataArray(std::vector<unsigned int>& out, const Element& el) {
    out.resize( 0 );
    const TokenList& tok = el.Tokens();
    if(tok.empty()) {
        ParseError("unexpected empty element",&el);
    }

    if(tok[0]->IsBinary()) {
        const char* data = tok[0]->begin(), *end = tok[0]->end();

        char type;
        uint32_t count;
        ReadBinaryDataArrayHead(data, end, type, count, el);

        if(!count) {
            return;
        }

        if (type != 'i') {
            ParseError("expected (u)int array (binary)",&el);
        }

        std::vector<char> buff;
        ReadBinaryDataArray(type, count, data, end, buff, el);

        ai_assert(data == end);
        uint64_t dataToRead = static_cast<uint64_t>(count) * 4;
        if (dataToRead != buff.size()) {
            ParseError("Invalid read size (binary)",&el);
        }

        out.reserve(count);

        const int32_t* ip = reinterpret_cast<const int32_t*>(&buff[0]);
        for (unsigned int i = 0; i < count; ++i, ++ip) {
            BE_NCONST int32_t val = *ip;
            if(val < 0) {
                ParseError("encountered negative integer index (binary)");
            }

            AI_SWAP4(val);
            out.push_back(val);
        }

        return;
    }

    const size_t dim = ParseTokenAsDim(*tok[0]);

    // see notes in ParseVectorDataArray()
    out.reserve(dim);

    const Scope& scope = GetRequiredScope(el);
    const Element& a = GetRequiredElement(scope,"a",&el);

    for (TokenList::const_iterator it = a.Tokens().begin(), end = a.Tokens().end(); it != end; ) {
        const int ival = ParseTokenAsInt(**it++);
        if(ival < 0) {
            ParseError("encountered negative integer index");
        }
        out.push_back(static_cast<unsigned int>(ival));
    }
}


// ------------------------------------------------------------------------------------------------
// read an array of uint64_ts
void ParseVectorDataArray(std::vector<uint64_t>& out, const Element& el)
{
    out.resize( 0 );
    const TokenList& tok = el.Tokens();
    if(tok.empty()) {
        ParseError("unexpected empty element",&el);
    }

    if(tok[0]->IsBinary()) {
        const char* data = tok[0]->begin(), *end = tok[0]->end();

        char type;
        uint32_t count;
        ReadBinaryDataArrayHead(data, end, type, count, el);

        if(!count) {
            return;
        }

        if (type != 'l') {
            ParseError("expected long array (binary)",&el);
        }

        std::vector<char> buff;
        ReadBinaryDataArray(type, count, data, end, buff, el);

        ai_assert(data == end);
        uint64_t dataToRead = static_cast<uint64_t>(count) * 8;
        if (dataToRead != buff.size()) {
            ParseError("Invalid read size (binary)",&el);
        }

        out.reserve(count);

        const uint64_t* ip = reinterpret_cast<const uint64_t*>(&buff[0]);
        for (unsigned int i = 0; i < count; ++i, ++ip) {
            BE_NCONST uint64_t val = *ip;
            AI_SWAP8(val);
            out.push_back(val);
        }

        return;
    }

    const size_t dim = ParseTokenAsDim(*tok[0]);

    // see notes in ParseVectorDataArray()
    out.reserve(dim);

    const Scope& scope = GetRequiredScope(el);
    const Element& a = GetRequiredElement(scope,"a",&el);

    for (TokenList::const_iterator it = a.Tokens().begin(), end = a.Tokens().end(); it != end; ) {
        const uint64_t ival = ParseTokenAsID(**it++);

        out.push_back(ival);
    }
}

// ------------------------------------------------------------------------------------------------
// read an array of int64_ts
void ParseVectorDataArray(std::vector<int64_t>& out, const Element& el)
{
    out.resize( 0 );
    const TokenList& tok = el.Tokens();
    if (tok.empty()) {
        ParseError("unexpected empty element", &el);
    }

    if (tok[0]->IsBinary()) {
        const char* data = tok[0]->begin(), *end = tok[0]->end();

        char type;
        uint32_t count;
        ReadBinaryDataArrayHead(data, end, type, count, el);

        if (!count) {
            return;
        }

        if (type != 'l') {
            ParseError("expected long array (binary)", &el);
        }

        std::vector<char> buff;
        ReadBinaryDataArray(type, count, data, end, buff, el);

        ai_assert(data == end);
        uint64_t dataToRead = static_cast<uint64_t>(count) * 8;
        if (dataToRead != buff.size()) {
            ParseError("Invalid read size (binary)",&el);
        }

        out.reserve(count);

        const int64_t* ip = reinterpret_cast<const int64_t*>(&buff[0]);
        for (unsigned int i = 0; i < count; ++i, ++ip) {
            BE_NCONST int64_t val = *ip;
            AI_SWAP8(val);
            out.push_back(val);
        }

        return;
    }

    const size_t dim = ParseTokenAsDim(*tok[0]);

    // see notes in ParseVectorDataArray()
    out.reserve(dim);

    const Scope& scope = GetRequiredScope(el);
    const Element& a = GetRequiredElement(scope, "a", &el);

    for (TokenList::const_iterator it = a.Tokens().begin(), end = a.Tokens().end(); it != end;) {
        const int64_t ival = ParseTokenAsInt64(**it++);

        out.push_back(ival);
    }
}

// ------------------------------------------------------------------------------------------------
aiMatrix4x4 ReadMatrix(const Element& element)
{
    std::vector<float> values;
    ParseVectorDataArray(values,element);

    if(values.size() != 16) {
        ParseError("expected 16 matrix elements");
    }

    aiMatrix4x4 result;


    result.a1 = values[0];
    result.a2 = values[1];
    result.a3 = values[2];
    result.a4 = values[3];

    result.b1 = values[4];
    result.b2 = values[5];
    result.b3 = values[6];
    result.b4 = values[7];

    result.c1 = values[8];
    result.c2 = values[9];
    result.c3 = values[10];
    result.c4 = values[11];

    result.d1 = values[12];
    result.d2 = values[13];
    result.d3 = values[14];
    result.d4 = values[15];

    result.Transpose();
    return result;
}

// ------------------------------------------------------------------------------------------------
// wrapper around ParseTokenAsString() with ParseError handling
std::string ParseTokenAsString(const Token& t)
{
    const char* err;
    const std::string& i = ParseTokenAsString(t,err);
    if(err) {
        ParseError(err,t);
    }
    return i;
}

bool HasElement( const Scope& sc, const std::string& index ) {
    const Element* el = sc[ index ];
    if ( nullptr == el ) {
        return false;
    }

    return true;
}

// ------------------------------------------------------------------------------------------------
// extract a required element from a scope, abort if the element cannot be found
const Element& GetRequiredElement(const Scope& sc, const std::string& index, const Element* element /*= nullptr*/)
{
    const Element* el = sc[index];
    if(!el) {
        ParseError("did not find required element \"" + index + "\"",element);
    }
    return *el;
}


// ------------------------------------------------------------------------------------------------
// extract required compound scope
const Scope& GetRequiredScope(const Element& el)
{
    const Scope* const s = el.Compound();
    if(!s) {
        ParseError("expected compound scope",&el);
    }

    return *s;
}


// ------------------------------------------------------------------------------------------------
// get token at a particular index
const Token& GetRequiredToken(const Element& el, unsigned int index)
{
    const TokenList& t = el.Tokens();
    if(index >= t.size()) {
        ParseError(Formatter::format( "missing token at index " ) << index,&el);
    }

    return *t[index];
}


// ------------------------------------------------------------------------------------------------
// wrapper around ParseTokenAsID() with ParseError handling
uint64_t ParseTokenAsID(const Token& t)
{
    const char* err;
    const uint64_t i = ParseTokenAsID(t,err);
    if(err) {
        ParseError(err,t);
    }
    return i;
}


// ------------------------------------------------------------------------------------------------
// wrapper around ParseTokenAsDim() with ParseError handling
size_t ParseTokenAsDim(const Token& t)
{
    const char* err;
    const size_t i = ParseTokenAsDim(t,err);
    if(err) {
        ParseError(err,t);
    }
    return i;
}


// ------------------------------------------------------------------------------------------------
// wrapper around ParseTokenAsFloat() with ParseError handling
float ParseTokenAsFloat(const Token& t)
{
    const char* err;
    const float i = ParseTokenAsFloat(t,err);
    if(err) {
        ParseError(err,t);
    }
    return i;
}

// ------------------------------------------------------------------------------------------------
// wrapper around ParseTokenAsInt() with ParseError handling
int ParseTokenAsInt(const Token& t)
{
    const char* err;
    const int i = ParseTokenAsInt(t,err);
    if(err) {
        ParseError(err,t);
    }
    return i;
}

// ------------------------------------------------------------------------------------------------
// wrapper around ParseTokenAsInt64() with ParseError handling
int64_t ParseTokenAsInt64(const Token& t)
{
    const char* err;
    const int64_t i = ParseTokenAsInt64(t, err);
    if (err) {
        ParseError(err, t);
    }
    return i;
}

} // !FBX
} // !Assimp

#endif

Coverage Report

Created: 2025-11-11 06:59