refactor source tree organization, switch to meson

src/api-impl-jni/android_content_res_AssetManager.c

@@ -0,0 +1,101 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "defines.h"
+#include "util.h"
+#include "generated_headers/android_content_res_AssetManager.h"
+
+#define ASSET_DIR "data/assets/"
+
+JNIEXPORT jint JNICALL Java_android_content_res_AssetManager_openAsset(JNIEnv *env, jobject this, jstring _file_name, jint mode)
+{
+	const char *file_name = _CSTRING(_file_name);
+	char *path = malloc(strlen(file_name) + strlen(ASSET_DIR) + 1);
+	int fd;
+
+	strcpy(path, ASSET_DIR);
+	strcat(path, file_name);
+
+	printf("openning asset with filename: %s\n", _CSTRING(_file_name));
+
+	printf("openning asset at path: %s\n", path);
+
+	fd = open(path, O_CLOEXEC | O_RDWR);
+
+	free(path);
+
+	return fd;
+}
+
+JNIEXPORT jlong JNICALL Java_android_content_res_AssetManager_getAssetLength(JNIEnv *env, jobject this, jint fd)
+{
+	int ret;
+	struct stat statbuf;
+
+	ret = fstat(fd, &statbuf);
+	if(ret)
+		printf("oopsie, fstat failed on fd: %d with errno: %d\n", fd, errno);
+
+	return statbuf.st_size;
+}
+
+JNIEXPORT jlong JNICALL Java_android_content_res_AssetManager_getAssetRemainingLength(JNIEnv *env, jobject this, jint fd)
+{
+	jlong file_size = Java_android_content_res_AssetManager_getAssetLength(env, this, fd);
+	off_t offset = lseek(fd, 0, SEEK_CUR);
+
+	return file_size - offset;
+}
+
+JNIEXPORT jint JNICALL Java_android_content_res_AssetManager_readAsset(JNIEnv *env, jobject this, jint fd, jbyteArray b, jint off, jint len)
+{
+	int ret;
+	int err;
+
+	jbyte *array = _GET_BYTE_ARRAY_ELEMENTS(b);
+	ret = read(fd, &array[off], len);
+	_RELEASE_BYTE_ARRAY_ELEMENTS(b, array);
+
+	if(ret < 0) {
+		err = errno;
+		printf("oopsie, read failed on fd: %d with errno: %d\n", fd, err);
+		exit(err);
+	} else if (ret == 0) { //EOF
+		return -1;
+	} else {
+		return ret;
+	}
+}
+
+JNIEXPORT jint JNICALL Java_android_content_res_AssetManager_readAssetChar(JNIEnv *env, jobject this, jint fd)
+{
+	int ret;
+	int err;
+	unsigned char byte;
+
+	ret = read(fd, &byte, 1);
+	if(ret == 1)
+		return byte;
+	else if(ret == 0)
+		return -1;
+	else {
+		err = errno;
+		printf("oopsie, read failed on fd: %d with errno: %d\n", fd, err);
+		exit(err);
+	}
+}
+
+JNIEXPORT jlong JNICALL Java_android_content_res_AssetManager_seekAsset(JNIEnv *env, jobject this, jint fd, jlong off, jint whence)
+{
+	return lseek(fd, off, (whence > 0) ? SEEK_END : (whence < 0 ? SEEK_SET : SEEK_CUR));
+}
+
+JNIEXPORT void JNICALL Java_android_content_res_AssetManager_destroyAsset(JNIEnv *env, jobject this, jint fd)
+{
+	printf("closing asset with fd: %d\n", fd);
+	close(fd);
+}