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86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
#include "devoptab_fs.h"
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ssize_t
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__wut_fs_read(struct _reent *r,
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void *fd,
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char *ptr,
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size_t len)
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{
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FSStatus status = 0;
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FSCmdBlock cmd;
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uint8_t *alignedReadBuffer;
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uint32_t bytes, bytesRead;
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__wut_fs_file_t *file;
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if (!fd || !ptr) {
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r->_errno = EINVAL;
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return -1;
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}
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FSInitCmdBlock(&cmd);
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file = (__wut_fs_file_t *)fd;
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bytesRead = 0;
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// Check that the file was opened with read access
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if ((file->flags & O_ACCMODE) == O_WRONLY) {
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r->_errno = EBADF;
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return -1;
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}
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if((((uintptr_t) ptr) & 0x3F) == 0){
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status = FSReadFile(__wut_devoptab_fs_client, &cmd, (uint8_t *) ptr, 1,
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len, file->fd, 0, FS_ERROR_FLAG_ALL);
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if(status > 0){
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bytesRead = (uint32_t) status;
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file->offset += bytesRead;
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}
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} else {
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// Copy to internal buffer due to alignment requirement and read in chunks.
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// Using a buffer smaller than 128KiB takes a performance hit.
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int buffer_size = len < 128*1024 ? len : 128*1024;
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alignedReadBuffer = memalign(0x40, buffer_size);
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if(!alignedReadBuffer){
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r->_errno = ENOMEM;
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return -1;
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}
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while (len > 0) {
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size_t toRead = len > buffer_size ? buffer_size : len;
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// Write the data
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status = FSReadFile(__wut_devoptab_fs_client, &cmd, alignedReadBuffer, 1,
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toRead, file->fd, 0, FS_ERROR_FLAG_ALL);
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if (status <= 0) {
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break;
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}
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// Copy to internal buffer
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bytes = (uint32_t)status;
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memcpy(ptr, alignedReadBuffer, bytes);
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file->offset += bytes;
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bytesRead += bytes;
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ptr += bytes;
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len -= bytes;
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if (bytes < toRead) {
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// If we did not read the full requested toRead bytes then we reached
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// the end of the file.
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break;
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}
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}
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free(alignedReadBuffer);
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}
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// Return partial read
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if (bytesRead > 0) {
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return bytesRead;
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}
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if (status < 0) {
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r->_errno = __wut_fs_translate_error(status);
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return -1;
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}
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return 0;
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}
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