Add source code

Author: koshkokoshka

README.md

@@ -1,2 +1,3 @@
-# c-fbx-parser
-Compact .FBX parser written in C language
+# Compact .FBX parser
+
+Compact .FBX parser written in C language

a.fbx

@@ -0,0 +1,292 @@
+#include "fbx.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+FBXNodeList *FBXNodeList_Create(size_t initial_capacity)
+{
+    FBXNodeList *list = malloc(sizeof(FBXNodeList));
+    if (list == NULL) {
+        return NULL;
+    }
+
+    list->length = 0;
+    list->capacity = initial_capacity;
+
+    if (initial_capacity > 0) {
+        list->nodes = malloc(sizeof(FBXNode) * initial_capacity);
+        if (list->nodes == NULL) {
+            free(list);
+            return NULL;
+        }
+    } else {
+        list->nodes = NULL;
+    }
+
+    return list;
+}
+
+bool FBXNodeList_Resize(FBXNodeList *list, size_t capacity)
+{
+    void *memory_address;
+    if (list->nodes == NULL) {
+        memory_address = malloc(sizeof(FBXNode));
+    } else {
+        memory_address = realloc(list->nodes, sizeof(FBXNode) * capacity);
+    }
+    if (memory_address == NULL) {
+        return false;
+    }
+    list->nodes = memory_address;
+    list->capacity = capacity;
+    return true;
+}
+
+bool FBXNodeList_Truncate(FBXNodeList *list)
+{
+    if (list->length == list->capacity) {
+        return true;
+    }
+    return FBXNodeList_Resize(list, list->length);
+}
+
+bool FBXNodeList_Insert(FBXNodeList *list, FBXNode *node)
+{
+    size_t new_length = list->length + 1;
+    if (new_length > list->capacity) {
+
+        size_t new_capacity = list->capacity + list->capacity; // grow capacity
+        if (new_capacity == 0) {
+            new_capacity = 1;
+        }
+
+        if (FBXNodeList_Resize(list, new_capacity) == false) {
+            return false;
+        }
+    }
+
+    memcpy(&list->nodes[list->length], node, sizeof(FBXNode));
+    list->length = new_length;
+
+    return true;
+}
+
+bool FBX_ParseNodeProperty(FILE *file, FBXNodeProperty *property)
+{
+    // Read property type
+    fread(&property->type, sizeof(uint8_t), 1, file);
+
+    // Read property value
+    switch (property->type) {
+        case 'Y': { /* i16 */
+            fread(&property->Y.value, sizeof(int16_t), 1, file);
+            break;
+        }
+        case 'C': { /* u8 (bool) */
+            fread(&property->C.value, sizeof(bool), 1, file);
+            break;
+        }
+        case 'I': { /* i32 */
+            fread(&property->I.value, sizeof(int32_t), 1, file);
+            break;
+        }
+        case 'F': { /* f32 */
+            fread(&property->F.value, sizeof(float), 1, file);
+            break;
+        }
+        case 'D': { /* f64 */
+            fread(&property->D.value, sizeof(double), 1, file);
+            break;
+        }
+        case 'L': { /* i64 */
+            fread(&property->L.value, sizeof(int64_t), 1, file);
+            break;
+        }
+        case 'f': { /* f32[] */
+            fread(&property->f.length, sizeof(uint32_t), 1, file);
+            fread(&property->f.encoding, sizeof(uint32_t), 1, file);
+            fread(&property->f.compressed_length, sizeof(uint32_t), 1, file);
+            if (property->f.encoding == 0) {
+                fseek(file, sizeof(float) * property->f.length, SEEK_CUR);
+            } else {
+                fseek(file, property->f.compressed_length, SEEK_CUR);
+            }
+            break;
+        }
+        case 'd': { /* f64[] */
+            fread(&property->d.length, sizeof(uint32_t), 1, file);
+            fread(&property->d.encoding, sizeof(uint32_t), 1, file);
+            fread(&property->d.compressed_length, sizeof(uint32_t), 1, file);
+            if (property->d.encoding == 0) {
+                fseek(file, sizeof(double ) * property->d.length, SEEK_CUR);
+            } else {
+                fseek(file, property->d.compressed_length, SEEK_CUR);
+            }
+            break;
+        }
+        case 'l': { /* i64[] */
+            fread(&property->l.length, sizeof(uint32_t), 1, file);
+            fread(&property->l.encoding, sizeof(uint32_t), 1, file);
+            fread(&property->l.compressed_length, sizeof(uint32_t), 1, file);
+            if (property->l.encoding == 0) {
+                fseek(file, sizeof(int64_t) * property->l.length, SEEK_CUR);
+            } else {
+                fseek(file, property->l.compressed_length, SEEK_CUR);
+            }
+            break;
+        }
+        case 'i': { /* i32[] */
+            fread(&property->i.length, sizeof(uint32_t), 1, file);
+            fread(&property->i.encoding, sizeof(uint32_t), 1, file);
+            fread(&property->i.compressed_length, sizeof(uint32_t), 1, file);
+            if (property->i.encoding == 0) {
+                fseek(file, sizeof(int32_t) * property->i.length, SEEK_CUR);
+            } else {
+                fseek(file, property->i.compressed_length, SEEK_CUR);
+            }
+            break;
+        }
+        case 'b': { /* u8[] (bool[]) */
+            fread(&property->b.length, sizeof(uint32_t), 1, file);
+            fread(&property->b.encoding, sizeof(uint32_t), 1, file);
+            fread(&property->b.compressed_length, sizeof(uint32_t), 1, file);
+            if (property->b.encoding == 0) {
+                fseek(file, sizeof(bool) * property->b.length, SEEK_CUR);
+            } else {
+                fseek(file, property->b.compressed_length, SEEK_CUR);
+            }
+            break;
+        }
+        case 'S': { /* raw string */
+            fread(&property->S.length, sizeof(uint32_t), 1, file);
+            fseek(file, property->S.length, SEEK_CUR);
+            break;
+        }
+        case 'R': { /* raw binary */
+            fread(&property->R.length, sizeof(uint32_t), 1, file);
+            fseek(file, property->R.length, SEEK_CUR);
+            break;
+        }
+        default: {
+            return false; // invalid property type
+        }
+    }
+
+    return true;
+}
+
+bool FBX_ParseNode(FILE *file, FBXNode *node)
+{
+    // Read node record
+    fread(&node->end_offset, sizeof(uint32_t), 1, file);
+    if (ferror(file) != 0) {
+        return false;
+    }
+    fread(&node->properties_count, sizeof(uint32_t), 1, file);
+    if (ferror(file) != 0) {
+        return false;
+    }
+    fread(&node->properties_list_length, sizeof(uint32_t), 1, file);
+    if (ferror(file) != 0) {
+        return false;
+    }
+    fread(&node->name_length, sizeof(uint8_t), 1, file);
+    if (ferror(file) != 0) {
+        return false; // failed to read a node
+    }
+
+    // Read node name
+    fread(node->name, 1, node->name_length, file);
+    if (ferror(file) != 0) {
+        return false; // failed to read a node name
+    }
+    node->name[node->name_length] = '\0'; // end string with the '\0' character
+//    fseek(file, node->name_length, SEEK_CUR);
+
+    // Read node properties
+    FBXNodeProperty property;
+    for (int i = 0; i < node->properties_count; ++i) {
+        if (!FBX_ParseNodeProperty(file, &property)) {
+            return false;
+        }
+    }
+//    fseek(file, node->properties_list_length, SEEK_CUR);
+
+    return true;
+}
+
+FBXNodeList *FBX_ParseNodes(FILE *file)
+{
+    FBXNodeList *list = FBXNodeList_Create(0);
+    if (list == NULL) {
+        return NULL;
+    }
+
+    while (1) {
+        FBXNode node;
+        memset(&node, 0, sizeof(FBXNode));
+        if (FBX_ParseNode(file, &node) == false) {
+            break;
+        }
+        if (node.end_offset == 0) {
+            break; // no more list
+        }
+
+        if (ftell(file) != node.end_offset) {
+            // Recursive parse subnodes
+            node.subnodes = FBX_ParseNodes(file);
+
+            // Skip to the next node
+            if (fseek(file, node.end_offset, SEEK_SET) != 0) {
+                break;
+            }
+        }
+
+        if (FBXNodeList_Insert(list, &node) == false) {
+            break;
+        }
+    }
+
+    FBXNodeList_Truncate(list);
+
+    return list;
+}
+
+FBXNodeList *FBX_Parse(const char *path)
+{
+    FBXNodeList *nodes = NULL;
+
+    // Open file handle
+    FILE *file = NULL;
+    if (fopen_s(&file, path, "rb") != 0) {
+        goto FUNCTION_END;
+    }
+
+    // Check file signature
+    char buffer[21];
+    fread(buffer, 21, 1, file);
+    if (ferror(file) != 0) {
+        goto FUNCTION_END;
+    }
+    const char *FBX_SIGNATURE = "Kaydara FBX Binary  ";
+    if (strncmp(buffer, FBX_SIGNATURE, 20) != 0) {
+        goto FUNCTION_END;
+    }
+
+    // Skip to the beginning of the first node
+    if (fseek(file, 27, SEEK_SET) != 0) {
+        goto FUNCTION_END;
+    }
+
+    // Read nodes
+    nodes = FBX_ParseNodes(file);
+
+    // Cleanup and exit
+FUNCTION_END:
+    if (file != NULL) {
+        fclose(file);
+    }
+
+    return nodes;
+}

fbx.c

@@ -0,0 +1,54 @@
+#ifndef FBX_H
+#define FBX_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#define FBX_NODE_NAME_MAX 0xFF
+
+struct FBXNode;
+struct FBXNodeProperty;
+struct FBXNodeList;
+
+typedef struct FBXNode FBXNode;
+typedef struct FBXNodeProperty FBXNodeProperty;
+typedef struct FBXNodeList FBXNodeList;
+
+struct FBXNodeList {
+    size_t length;
+    size_t capacity;
+    struct FBXNode *nodes;
+};
+
+struct FBXNode {
+    uint32_t end_offset;
+    uint32_t properties_count;
+    uint32_t properties_list_length;
+    uint8_t name_length;
+    char name[FBX_NODE_NAME_MAX];
+    struct FBXNodeList *subnodes;
+};
+
+struct FBXNodeProperty {
+    uint8_t type;
+    union {
+        struct { int16_t value; } Y; // i16
+        struct { bool value; } C; // u8
+        struct { int32_t value; } I; // i32
+        struct { float value; } F; // f32
+        struct { double value; } D; // f64
+        struct { int64_t value; } L; // i64
+        struct { int length; int encoding; int compressed_length; float *value; } f; // f32[]
+        struct { int length; int encoding; int compressed_length; double *value; } d; // f64[]
+        struct { int length; int encoding; int compressed_length; int64_t *value; } l; // i64[]
+        struct { int length; int encoding; int compressed_length; int32_t *value; } i; // i32[]
+        struct { int length; int encoding; int compressed_length; bool *value; } b; // u8[]
+        struct { int length; char *value; } S; // string
+        struct { int length; uint8_t *value; } R; // raw
+        void *value;
+    };
+};
+
+FBXNodeList *FBX_Parse(const char *path);
+
+#endif