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int16

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This commit is contained in:
源文雨
2022-05-03 01:29:08 +08:00
parent e24f761f34
commit bd6ce1d778
11 changed files with 636 additions and 35 deletions
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39
src/page.c
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@@ -14,8 +14,13 @@ static const uint8_t nullpage[PAGESZ];
void* alloc_page(int fd, void* page) {
uint64_t ptr = 8, prev_ptr = 0, prev_prev_ptr = 0;
uint8_t buf[8];
if(page == NULL) return NULL;
// 对于 page，只关心位于第一页 8~15 字节的 ptr of unused blk
while(ptr) {
if(unlikely(ptr == prev_ptr)) { // 文件损坏
errno = ESPIPE;
return NULL;
}
if(!(ptr%PAGESZ)) { // 找到符合要求的页
if(lseek(fd, ptr, SEEK_SET) < 0) return NULL;
if(read(fd, buf, 8) != 8) return NULL;
@@ -46,7 +51,7 @@ void* alloc_page(int fd, void* page) {
readle64(fd, ptr);
}
ptr = lseek(fd, 0, SEEK_END);
if(ptr < 0) return NULL;
if((int)ptr < 0) return NULL;
if(ptr%PAGESZ) { // 文件没有页对齐
errno = ESPIPE;
return NULL;
@@ -57,6 +62,7 @@ void* alloc_page(int fd, void* page) {
}
void* get_page(int fd, uint64_t ptr, void* page) {
if(page == NULL) return NULL;
if(ptr%PAGESZ) return NULL;
if(lseek(fd, ptr, SEEK_SET) < 0) return NULL;
putle64(page, ptr);
@@ -66,16 +72,21 @@ void* get_page(int fd, uint64_t ptr, void* page) {
}
int sync_page(int fd, void* page) {
if(page == NULL) return EOF;
uint64_t ptr = le64(page-8);
if(lseek(fd, ptr, SEEK_SET) < 0) return EOF;
return write(fd, page, PAGESZ) != PAGESZ;
}
int free_page(int fd, void* page) {
if(page == NULL) return EOF;
uint64_t ptr = 8, prev_ptr = 0, prev_prev_ptr = 0, page_ptr = le64(page-8);
uint8_t buf[8];
while(ptr && ptr < page_ptr) {
if(prev_ptr == ptr) return EOF;
if(unlikely(ptr == prev_ptr)) { // 文件损坏
errno = ESPIPE;
return EOF;
}
if(prev_prev_ptr && ptr < prev_ptr) { // 不符合顺序，进行一次调整
lseek(fd, prev_prev_ptr, SEEK_SET);
putle64(buf, ptr);
@@ -110,11 +121,16 @@ void* alloc_block(int fd, uint16_t size, void* blk) {
uint8_t buf[8];
uint16_t blksz;
if(blk == NULL) return NULL;
if(size > PAGESZ) return NULL;
// 对于 page，只关心位于第一页 8~15 字节的 ptr of unused blk
while(ptr) {
if(lseek(fd, ptr, SEEK_SET) < 0) return NULL;
if(read(fd, buf, 8) != 8) return NULL;
if(unlikely(lseek(fd, ptr, SEEK_SET) < 0)) return NULL;
if(unlikely(read(fd, buf, 8) != 8)) return NULL;
if(unlikely(ptr == prev_ptr)) { // 文件损坏
errno = ESPIPE;
return NULL;
}
readle16(fd, blksz);
if(blksz >= size) { // 找到符合要求的块
if(blksz - size > 10) { // 分裂块
@@ -153,7 +169,7 @@ void* alloc_block(int fd, uint16_t size, void* blk) {
readle64(fd, ptr);
}
ptr = lseek(fd, 0, SEEK_END);
if(ptr < 0) return NULL;
if((int)ptr < 0) return NULL;
if(ptr%PAGESZ) { // 文件没有页对齐
errno = ESPIPE;
return NULL;
@@ -173,6 +189,7 @@ void* alloc_block(int fd, uint16_t size, void* blk) {
}
void* get_block(int fd, uint16_t size, uint64_t ptr, void* blk) {
if(blk == NULL) return NULL;
if(lseek(fd, ptr, SEEK_SET) < 0) return NULL;
putle64(blk, ptr);
putle16(blk+8, size);
@@ -182,6 +199,7 @@ void* get_block(int fd, uint16_t size, uint64_t ptr, void* blk) {
}
int sync_block(int fd, void* blk) {
if(blk == NULL) return EOF;
uint64_t off = le64(blk-10);
uint16_t size = le16(blk-2);
if(size > PAGESZ) {
@@ -193,11 +211,15 @@ int sync_block(int fd, void* blk) {
}
int free_block(int fd, void* blk) {
if(blk == NULL) return EOF;
uint64_t ptr = 8, prev_ptr = 0, prev_prev_ptr = 0, off = le64(blk-10);
uint8_t buf[8];
uint16_t size = le16(blk-2), sz;
while(ptr && ptr < off) {
if(prev_ptr == ptr) return EOF;
if(unlikely(ptr == prev_ptr)) { // 文件损坏
errno = ESPIPE;
return EOF;
}
if(prev_prev_ptr && ptr < prev_ptr) { // 不符合顺序，进行一次调整
lseek(fd, prev_prev_ptr, SEEK_SET);
putle64(buf, ptr);
@@ -247,7 +269,10 @@ int add_block(int fd, uint16_t size, uint64_t off) {
uint8_t buf[8];
uint16_t sz;
while(ptr && ptr < off) {
if(prev_ptr == ptr) return EOF;
if(unlikely(ptr == prev_ptr)) { // 文件损坏
errno = ESPIPE;
return EOF;
}
if(prev_prev_ptr && ptr < prev_ptr) { // 不符合顺序，进行一次调整
lseek(fd, prev_prev_ptr, SEEK_SET);
putle64(buf, ptr);