lpnf
/
lovr
mirror of https://github.com/bjornbytes/lovr.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

glTF: Add support for base64 buffer data;

This commit is contained in:
bjorn 2019-05-26 21:13:59 -07:00
parent 56f4c812ce
commit 4221c547d7
1 changed files with 59 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

66
src/modules/data/modelData_gltf.c
View File

@ -81,6 +81,53 @@ static int nomValue(const char* data, jsmntok_t* token, int count, int sum) {
}
}
static void* decodeBase64(char* str, size_t length, size_t decodedSize) {
str = memchr(str, ',', length);
if (!str) {
return NULL;
} else {
str++;
}
uint8_t* data = malloc(decodedSize);
if (!data) {
return NULL;
}
uint32_t num = 0;
uint32_t bits = 0;
for (size_t i = 0; i < decodedSize; i++) {
while (bits < 8) {
char c = *str++;
uint32_t n;
if (c >= 'A' && c <= 'Z') {
n = c - 'A';
} else if (c >= 'a' && c <= 'z') {
n = c - 'a' + 26;
} else if (c >= '0' && c <= '9') {
n = c - '0' + 52;
} else if (c == '+') {
n = 62;
} else if (c == '/') {
n = 63;
} else {
free(data);
return NULL;
}
num <<= 6;
num |= n;
bits += 6;
}
data[i] = num >> (bits - 8);
bits -= 8;
}
return data;
}
// Kinda like count += sum(map(arr, obj => #obj[key]))
static jsmntok_t* aggregate(const char* json, jsmntok_t* token, const char* target, uint32_t* count) {
for (int i = (token++)->size; i > 0; i--) {
@ -425,12 +472,17 @@ ModelData* lovrModelDataInitGltf(ModelData* model, Blob* source) {
if (uri.data) {
size_t bytesRead;
lovrAssert(uri.length < 5 || strncmp("data:", uri.data, 5), "Base64 URIs aren't supported yet");
lovrAssert(uri.length < maxPathLength, "Buffer filename is too long");
strncat(filename, uri.data, uri.length);
*blob = lovrBlobCreate(lovrFilesystemRead(filename, -1, &bytesRead), size, NULL);
lovrAssert((*blob)->data && bytesRead == size, "Unable to read %s", filename);
*root = '\0';
if (uri.length >= 5 && !strncmp("data:", uri.data, 5)) {
void* bufferData = decodeBase64(uri.data, uri.length, size);
lovrAssert(bufferData, "Could not decode base64 buffer");
*blob = lovrBlobCreate(bufferData, size, NULL);
} else {
lovrAssert(uri.length < maxPathLength, "Buffer filename is too long");
strncat(filename, uri.data, uri.length);
*blob = lovrBlobCreate(lovrFilesystemRead(filename, -1, &bytesRead), size, NULL);
lovrAssert((*blob)->data && bytesRead == size, "Unable to read %s", filename);
*root = '\0';
}
} else {
lovrAssert(glb, "Buffer is missing URI");
lovrRetain(source);
@ -606,7 +658,7 @@ ModelData* lovrModelDataInitGltf(ModelData* model, Blob* source) {
} else if (STR_EQ(key, "uri")) {
size_t size = 0;
gltfString uri = NOM_STR(json, token);
lovrAssert(uri.length < 5 || strncmp("data:", uri.data, 5), "Base64 URIs aren't supported yet");
lovrAssert(uri.length < 5 || strncmp("data:", uri.data, 5), "Base64 images aren't supported yet");
lovrAssert(uri.length < maxPathLength, "Image filename is too long");
strncat(filename, uri.data, uri.length);
void* data = lovrFilesystemRead(filename, -1, &size);