diff --git a/conf/common.rmk b/conf/common.rmk index 7db0b2a..3d3cd8a 100644 --- a/conf/common.rmk +++ b/conf/common.rmk @@ -382,7 +382,7 @@ crc_mod_CFLAGS = $(COMMON_CFLAGS) crc_mod_LDFLAGS = $(COMMON_LDFLAGS) # Misc. -pkglib_MODULES += gzio.mod elf.mod +pkglib_MODULES += gzio.mod bufio.mod elf.mod # For elf.mod. elf_mod_SOURCES = kern/elf.c @@ -393,3 +393,8 @@ elf_mod_LDFLAGS = $(COMMON_LDFLAGS) gzio_mod_SOURCES = io/gzio.c gzio_mod_CFLAGS = $(COMMON_CFLAGS) gzio_mod_LDFLAGS = $(COMMON_LDFLAGS) + +# For bufio.mod. +bufio_mod_SOURCES = io/bufio.c +bufio_mod_CFLAGS = $(COMMON_CFLAGS) +bufio_mod_LDFLAGS = $(COMMON_LDFLAGS) diff --git a/font/manager.c b/font/manager.c index 80d8d07..887a4a3 100644 --- a/font/manager.c +++ b/font/manager.c @@ -23,6 +23,7 @@ #include #include #include +#include struct entry { @@ -69,7 +70,7 @@ add_font (const char *filename) grub_uint32_t num, i; struct font *font = 0; - file = grub_file_open (filename); + file = grub_buffile_open (filename, 0); if (! file) goto fail; diff --git a/include/grub/bufio.h b/include/grub/bufio.h new file mode 100644 index 0000000..9a2294c --- /dev/null +++ b/include/grub/bufio.h @@ -0,0 +1,28 @@ +/* bufio.h - prototypes for bufio */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2008 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see . + */ + +#ifndef GRUB_BUFIO_H +#define GRUB_BUFIO_H 1 + +#include + +grub_file_t grub_bufio_open (grub_file_t io, int size); +grub_file_t grub_buffile_open (const char *name, int size); + +#endif /* ! GRUB_BUFIO_H */ diff --git a/io/bufio.c b/io/bufio.c new file mode 100644 index 0000000..40ed89b --- /dev/null +++ b/io/bufio.c @@ -0,0 +1,205 @@ +/* bufio.c - buffered io access */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2008 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see . + */ + +#include +#include +#include +#include +#include +#include + +#define GRUB_BUFIO_DEF_SIZE 8192 +#define GRUB_BUFIO_MAX_SIZE 1048576 + +struct grub_bufio +{ + grub_file_t file; + grub_size_t block_size; + grub_size_t buffer_len; + char buffer[0]; +}; +typedef struct grub_bufio *grub_bufio_t; + +static struct grub_fs grub_bufio_fs; + +grub_file_t +grub_bufio_open (grub_file_t io, int size) +{ + grub_file_t file; + grub_bufio_t bufio = 0; + + file = (grub_file_t) grub_malloc (sizeof (*file)); + if (! file) + return 0; + + if (size == 0) + size = GRUB_BUFIO_DEF_SIZE; + else if (size > GRUB_BUFIO_MAX_SIZE) + size = GRUB_BUFIO_MAX_SIZE; + + if ((size < 0) || ((unsigned) size > io->size)) + size = ((io->size > GRUB_BUFIO_MAX_SIZE) ? GRUB_BUFIO_MAX_SIZE : + io->size); + + bufio = grub_malloc (sizeof (struct grub_bufio) + size); + if (! bufio) + { + grub_free (file); + return 0; + } + + bufio->file = io; + bufio->block_size = size; + bufio->buffer_len = 0; + + file->device = io->device; + file->offset = 0; + file->size = io->size; + file->data = bufio; + file->read_hook = 0; + file->fs = &grub_bufio_fs; + + return file; +} + +grub_file_t +grub_buffile_open (const char *name, int size) +{ + grub_file_t io, file; + + io = grub_file_open (name); + if (! io) + return 0; + + file = grub_bufio_open (io, size); + if (! file) + { + grub_file_close (io); + return 0; + } + + return file; +} + +static grub_ssize_t +grub_bufio_read (grub_file_t file, char *buf, grub_size_t len) +{ + grub_size_t res = len; + grub_bufio_t bufio = file->data; + grub_uint32_t pos; + + if ((file->offset >= bufio->file->offset) && + (file->offset < bufio->file->offset + bufio->buffer_len)) + { + grub_size_t n; + + pos = file->offset - bufio->file->offset; + n = bufio->buffer_len - pos; + if (n > len) + n = len; + + grub_memcpy (buf, &bufio->buffer[pos], n); + len -= n; + if (! len) + return res; + + buf += n; + bufio->file->offset += bufio->buffer_len; + pos = 0; + } + else + { + bufio->file->offset = grub_divmod64 (file->offset, bufio->block_size, + &pos); + bufio->file->offset *= bufio->block_size; + } + + if (pos + len >= bufio->block_size) + { + if (pos) + { + grub_size_t n; + + bufio->file->fs->read (bufio->file, bufio->buffer, + bufio->block_size); + if (grub_errno) + return -1; + + n = bufio->block_size - pos; + grub_memcpy (buf, &bufio->buffer[pos], n); + len -= n; + buf += n; + bufio->file->offset += bufio->block_size; + pos = 0; + } + + while (len >= bufio->block_size) + { + bufio->file->fs->read (bufio->file, buf, bufio->block_size); + if (grub_errno) + return -1; + + len -= bufio->block_size; + buf += bufio->block_size; + bufio->file->offset += bufio->block_size; + } + + if (! len) + { + bufio->buffer_len = 0; + return res; + } + } + + bufio->buffer_len = bufio->file->size - bufio->file->offset; + if (bufio->buffer_len > bufio->block_size) + bufio->buffer_len = bufio->block_size; + + bufio->file->fs->read (bufio->file, bufio->buffer, bufio->buffer_len); + if (grub_errno) + return -1; + + grub_memcpy (buf, &bufio->buffer[pos], len); + + return res; +} + +static grub_err_t +grub_bufio_close (grub_file_t file) +{ + grub_bufio_t bufio = file->data; + + grub_file_close (bufio->file); + grub_free (bufio); + + file->device = 0; + + return grub_errno; +} + +static struct grub_fs grub_bufio_fs = + { + .name = "bufio", + .dir = 0, + .open = 0, + .read = grub_bufio_read, + .close = grub_bufio_close, + .label = 0, + .next = 0 + }; diff --git a/video/readers/jpeg.c b/video/readers/jpeg.c index 8a4f803..03f3a94 100644 --- a/video/readers/jpeg.c +++ b/video/readers/jpeg.c @@ -23,7 +23,7 @@ #include #include #include -#include +#include /* Uncomment following define to enable JPEG debug. */ //#define JPEG_DEBUG @@ -664,7 +664,7 @@ grub_video_reader_jpeg (struct grub_video_bitmap **bitmap, grub_file_t file; struct grub_jpeg_data *data; - file = grub_file_open (filename); + file = grub_buffile_open (filename, 0); if (!file) return grub_errno; diff --git a/video/readers/png.c b/video/readers/png.c index 9dac4b6..ceb77e7 100644 --- a/video/readers/png.c +++ b/video/readers/png.c @@ -23,7 +23,7 @@ #include #include #include -#include +#include /* Uncomment following define to enable PNG debug. */ //#define PNG_DEBUG @@ -840,7 +840,7 @@ grub_video_reader_png (struct grub_video_bitmap **bitmap, grub_file_t file; struct grub_png_data *data; - file = grub_file_open (filename); + file = grub_buffile_open (filename, 0); if (!file) return grub_errno; diff --git a/video/readers/tga.c b/video/readers/tga.c index 7b944b0..e5f3834 100644 --- a/video/readers/tga.c +++ b/video/readers/tga.c @@ -23,7 +23,7 @@ #include #include #include -#include +#include /* Uncomment following define to enable TGA debug. */ //#define TGA_DEBUG @@ -319,7 +319,7 @@ grub_video_reader_tga (struct grub_video_bitmap **bitmap, struct grub_tga_header header; int has_alpha; - file = grub_file_open (filename); + file = grub_buffile_open (filename, 0); if (! file) return grub_errno;