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/*
* Copyright (C) 2002-2004 Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
ssize_t ngx_read_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
{
long high_offset;
u_long n;
ngx_err_t err;
OVERLAPPED ovlp, *povlp;
if (ngx_win32_version < NGX_WIN_NT) {
/*
* in Win9X the overlapped pointer must be NULL
* so we need to use SetFilePointer() to set the offset
*/
if (file->offset != offset) {
/*
* the maximum file size on FAT16 is 2G, but on FAT32
* the size is 4G so we need to use high_offset
* because a single offset is signed value
*/
high_offset = (long) (offset >> 32);
if (SetFilePointer(file->fd, (long) offset, &high_offset,
FILE_BEGIN) == INVALID_SET_FILE_POINTER)
{
/*
* INVALID_SET_FILE_POINTER is 0xffffffff and it can be valid
* value for large file so we need also to check GetLastError()
*/
err = ngx_errno;
if (err != NO_ERROR) {
ngx_log_error(NGX_LOG_ERR, file->log, err,
"SeekFilePointer() failed");
return NGX_ERROR;
}
}
}
povlp = NULL;
} else {
ovlp.Internal = 0;
ovlp.InternalHigh = 0;
ovlp.Offset = (u_long) offset;
ovlp.OffsetHigh = (u_long) (offset >> 32);
ovlp.hEvent = NULL;
povlp = &ovlp;
}
if (ReadFile(file->fd, buf, size, &n, povlp) == 0) {
ngx_log_error(NGX_LOG_ERR, file->log, ngx_errno, "ReadFile() failed");
return NGX_ERROR;
}
file->offset += n;
return n;
}
ssize_t ngx_write_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
{
long high_offset;
u_long n;
ngx_err_t err;
OVERLAPPED ovlp, *povlp;
if (ngx_win32_version < NGX_WIN_NT) {
/*
* in Win9X the overlapped pointer must be NULL
* so we need to use SetFilePointer() to set the offset
*/
if (file->offset != offset) {
/*
* the maximum file size on FAT16 is 2G, but on FAT32
* the size is 4G so we need to use high_offset
* because a single offset is signed value
*/
high_offset = (long) (offset >> 32);
if (SetFilePointer(file->fd, (long) offset, &high_offset,
FILE_BEGIN) == INVALID_SET_FILE_POINTER)
{
/*
* INVALID_SET_FILE_POINTER is 0xffffffff and it can be valid
* value for large file so we need also to check GetLastError()
*/
err = ngx_errno;
if (err != NO_ERROR) {
ngx_log_error(NGX_LOG_ERR, file->log, err,
"SeekFilePointer() failed");
return NGX_ERROR;
}
}
}
povlp = NULL;
} else {
ovlp.Internal = 0;
ovlp.InternalHigh = 0;
ovlp.Offset = (u_long) offset;
ovlp.OffsetHigh = (u_long) (offset >> 32);
ovlp.hEvent = NULL;
povlp = &ovlp;
}
if (WriteFile(file->fd, buf, size, &n, povlp) == 0) {
ngx_log_error(NGX_LOG_ERR, file->log, ngx_errno, "WriteFile() failed");
return NGX_ERROR;
}
file->offset += n;
return n;
}
ssize_t ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl,
off_t offset, ngx_pool_t *pool)
{
u_char *buf, *prev;
size_t size;
ssize_t total, n;
total = 0;
while (cl) {
buf = cl->buf->pos;
prev = buf;
size = 0;
/* coalesce the neighbouring bufs */
while (cl && prev == cl->buf->pos) {
size += cl->buf->last - cl->buf->pos;
prev = cl->buf->last;
cl = cl->next;
}
n = ngx_write_file(file, buf, size, offset);
if (n == NGX_ERROR) {
return NGX_ERROR;
}
total += n;
offset += n;
}
return total;
}
int ngx_win32_rename_file(ngx_str_t *from, ngx_str_t *to, ngx_pool_t *pool)
{
int rc, collision;
u_int num;
u_char *name;
if (!(name = ngx_palloc(pool, to->len + 1 + 10 + 1 + sizeof("DELETE")))) {
return NGX_ERROR;
}
ngx_memcpy(name, to->data, to->len);
collision = 0;
/* mutex_lock() (per cache or single ?) */
do {
num = ngx_next_temp_number(collision);
ngx_snprintf((char *) name + to->len, 1 + 10 + 1 + sizeof("DELETE"),
".%010u.DELETE", num);
if (MoveFile((const char *) to->data, (const char *) name) == 0) {
collision = 1;
ngx_log_error(NGX_LOG_ERR, pool->log, ngx_errno,
"MoveFile() failed");
}
} while (collision);
if (MoveFile((const char *) from->data, (const char *) to->data) == 0) {
rc = NGX_ERROR;
} else {
rc = NGX_OK;
}
if (ngx_win32_version >= NGX_WIN_NT) {
if (DeleteFile((const char *) name) == 0) {
ngx_log_error(NGX_LOG_ERR, pool->log, ngx_errno,
"DeleteFile() failed");
}
} else {
/* TODO: Win9X: update the open files table */
}
if (rc == NGX_ERROR) {
ngx_log_error(NGX_LOG_ERR, pool->log, ngx_errno, "MoveFile() failed");
}
/* mutex_unlock() */
return rc;
}
#if 0
int ngx_file_info(char *file, ngx_file_info_t *sb)
{
WIN32_FILE_ATTRIBUTE_DATA fa;
/* NT4 and Win98 */
if (GetFileAttributesEx(file, GetFileExInfoStandard, &fa) == 0) {
return NGX_ERROR;
}
sb->dwFileAttributes = fa.dwFileAttributes;
sb->ftCreationTime = fa.ftCreationTime;
sb->ftLastAccessTime = fa.ftLastAccessTime;
sb->ftLastWriteTime = fa.ftLastWriteTime;
sb->nFileSizeHigh = fa.nFileSizeHigh;
sb->nFileSizeLow = fa.nFileSizeLow;
return NGX_OK;
}
#endif
int ngx_file_info(u_char *file, ngx_file_info_t *sb)
{
/* Win95 */
sb->dwFileAttributes = GetFileAttributes((const char *) file);
if (sb->dwFileAttributes == INVALID_FILE_ATTRIBUTES) {
return NGX_ERROR;
}
return NGX_OK;
}
int ngx_open_dir(ngx_str_t *name, ngx_dir_t *dir)
{
ngx_cpystrn(name->data + name->len, NGX_DIR_MASK, NGX_DIR_MASK_LEN + 1);
dir->dir = FindFirstFile((const char *) name->data, &dir->fd);
if (dir->dir == INVALID_HANDLE_VALUE) {
return NGX_ERROR;
}
dir->info_valid = 1;
dir->ready = 1;
return NGX_OK;
}
int ngx_read_dir(ngx_dir_t *dir)
{
if (dir->ready) {
dir->ready = 0;
return NGX_OK;
}
if (FindNextFile(dir->dir, &dir->fd) == 0) {
return NGX_ERROR;
}
return NGX_OK;
}
int ngx_file_append_mode(ngx_fd_t fd)
{
if (SetFilePointer(fd, 0, NULL, FILE_END) == INVALID_SET_FILE_POINTER) {
if (ngx_errno != NO_ERROR) {
return NGX_ERROR;
}
}
return NGX_OK;
}
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