diff options
Diffstat (limited to 'block-cloop.c')
| -rw-r--r-- | block-cloop.c | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/block-cloop.c b/block-cloop.c deleted file mode 100644 index 43d3801..0000000 --- a/block-cloop.c +++ /dev/null @@ -1,169 +0,0 @@ -/* - * QEMU Block driver for CLOOP images - * - * Copyright (c) 2004 Johannes E. Schindelin - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ -#include "qemu-common.h" -#include "block_int.h" -#include <zlib.h> - -typedef struct BDRVCloopState { - int fd; - uint32_t block_size; - uint32_t n_blocks; - uint64_t* offsets; - uint32_t sectors_per_block; - uint32_t current_block; - uint8_t *compressed_block; - uint8_t *uncompressed_block; - z_stream zstream; -} BDRVCloopState; - -static int cloop_probe(const uint8_t *buf, int buf_size, const char *filename) -{ - const char* magic_version_2_0="#!/bin/sh\n" - "#V2.0 Format\n" - "modprobe cloop file=$0 && mount -r -t iso9660 /dev/cloop $1\n"; - int length=strlen(magic_version_2_0); - if(length>buf_size) - length=buf_size; - if(!memcmp(magic_version_2_0,buf,length)) - return 2; - return 0; -} - -static int cloop_open(BlockDriverState *bs, const char *filename, int flags) -{ - BDRVCloopState *s = bs->opaque; - uint32_t offsets_size,max_compressed_block_size=1,i; - - s->fd = open(filename, O_RDONLY | O_BINARY); - if (s->fd < 0) - return -errno; - bs->read_only = 1; - - /* read header */ - if(lseek(s->fd,128,SEEK_SET)<0) { -cloop_close: - close(s->fd); - return -1; - } - if(read(s->fd,&s->block_size,4)<4) - goto cloop_close; - s->block_size=be32_to_cpu(s->block_size); - if(read(s->fd,&s->n_blocks,4)<4) - goto cloop_close; - s->n_blocks=be32_to_cpu(s->n_blocks); - - /* read offsets */ - offsets_size=s->n_blocks*sizeof(uint64_t); - if(!(s->offsets=(uint64_t*)malloc(offsets_size))) - goto cloop_close; - if(read(s->fd,s->offsets,offsets_size)<offsets_size) - goto cloop_close; - for(i=0;i<s->n_blocks;i++) { - s->offsets[i]=be64_to_cpu(s->offsets[i]); - if(i>0) { - uint32_t size=s->offsets[i]-s->offsets[i-1]; - if(size>max_compressed_block_size) - max_compressed_block_size=size; - } - } - - /* initialize zlib engine */ - if(!(s->compressed_block = malloc(max_compressed_block_size+1))) - goto cloop_close; - if(!(s->uncompressed_block = malloc(s->block_size))) - goto cloop_close; - if(inflateInit(&s->zstream) != Z_OK) - goto cloop_close; - s->current_block=s->n_blocks; - - s->sectors_per_block = s->block_size/512; - bs->total_sectors = s->n_blocks*s->sectors_per_block; - return 0; -} - -static inline int cloop_read_block(BDRVCloopState *s,int block_num) -{ - if(s->current_block != block_num) { - int ret; - uint32_t bytes = s->offsets[block_num+1]-s->offsets[block_num]; - - lseek(s->fd, s->offsets[block_num], SEEK_SET); - ret = read(s->fd, s->compressed_block, bytes); - if (ret != bytes) - return -1; - - s->zstream.next_in = s->compressed_block; - s->zstream.avail_in = bytes; - s->zstream.next_out = s->uncompressed_block; - s->zstream.avail_out = s->block_size; - ret = inflateReset(&s->zstream); - if(ret != Z_OK) - return -1; - ret = inflate(&s->zstream, Z_FINISH); - if(ret != Z_STREAM_END || s->zstream.total_out != s->block_size) - return -1; - - s->current_block = block_num; - } - return 0; -} - -static int cloop_read(BlockDriverState *bs, int64_t sector_num, - uint8_t *buf, int nb_sectors) -{ - BDRVCloopState *s = bs->opaque; - int i; - - for(i=0;i<nb_sectors;i++) { - uint32_t sector_offset_in_block=((sector_num+i)%s->sectors_per_block), - block_num=(sector_num+i)/s->sectors_per_block; - if(cloop_read_block(s, block_num) != 0) - return -1; - memcpy(buf+i*512,s->uncompressed_block+sector_offset_in_block*512,512); - } - return 0; -} - -static void cloop_close(BlockDriverState *bs) -{ - BDRVCloopState *s = bs->opaque; - close(s->fd); - if(s->n_blocks>0) - free(s->offsets); - free(s->compressed_block); - free(s->uncompressed_block); - inflateEnd(&s->zstream); -} - -BlockDriver bdrv_cloop = { - "cloop", - sizeof(BDRVCloopState), - cloop_probe, - cloop_open, - cloop_read, - NULL, - cloop_close, -}; - - |