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-rw-r--r--block-vpc.c239
1 files changed, 0 insertions, 239 deletions
diff --git a/block-vpc.c b/block-vpc.c
deleted file mode 100644
index f76c451..0000000
--- a/block-vpc.c
+++ /dev/null
@@ -1,239 +0,0 @@
-/*
- * Block driver for Conectix/Microsoft Virtual PC images
- *
- * Copyright (c) 2005 Alex Beregszaszi
- *
- * 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"
-
-/**************************************************************/
-
-#define HEADER_SIZE 512
-
-//#define CACHE
-
-// always big-endian
-struct vpc_subheader {
- char magic[8]; // "conectix" / "cxsparse"
- union {
- struct {
- uint32_t unk1[2];
- uint32_t unk2; // always zero?
- uint32_t subheader_offset;
- uint32_t unk3; // some size?
- char creator[4]; // "vpc "
- uint16_t major;
- uint16_t minor;
- char guest[4]; // "Wi2k"
- uint32_t unk4[7];
- uint8_t vnet_id[16]; // virtual network id, purpose unknown
- // next 16 longs are used, but dunno the purpose
- // next 6 longs unknown, following 7 long maybe a serial
- char padding[HEADER_SIZE - 84];
- } main;
- struct {
- uint32_t unk1[2]; // all bits set
- uint32_t unk2; // always zero?
- uint32_t pagetable_offset;
- uint32_t unk3;
- uint32_t pagetable_entries; // 32bit/entry
- uint32_t pageentry_size; // 512*8*512
- uint32_t nb_sectors;
- char padding[HEADER_SIZE - 40];
- } sparse;
- char padding[HEADER_SIZE - 8];
- } type;
-};
-
-typedef struct BDRVVPCState {
- int fd;
-
- int pagetable_entries;
- uint32_t *pagetable;
-
- uint32_t pageentry_size;
-#ifdef CACHE
- uint8_t *pageentry_u8;
- uint32_t *pageentry_u32;
- uint16_t *pageentry_u16;
-
- uint64_t last_bitmap;
-#endif
-} BDRVVPCState;
-
-static int vpc_probe(const uint8_t *buf, int buf_size, const char *filename)
-{
- if (buf_size >= 8 && !strncmp((char *)buf, "conectix", 8))
- return 100;
- return 0;
-}
-
-static int vpc_open(BlockDriverState *bs, const char *filename, int flags)
-{
- BDRVVPCState *s = bs->opaque;
- int fd, i;
- struct vpc_subheader header;
-
- fd = open(filename, O_RDONLY | O_BINARY);
- if (fd < 0)
- return -1;
-
- bs->read_only = 1; // no write support yet
-
- s->fd = fd;
-
- if (read(fd, &header, HEADER_SIZE) != HEADER_SIZE)
- goto fail;
-
- if (strncmp(header.magic, "conectix", 8))
- goto fail;
- lseek(s->fd, be32_to_cpu(header.type.main.subheader_offset), SEEK_SET);
-
- if (read(fd, &header, HEADER_SIZE) != HEADER_SIZE)
- goto fail;
-
- if (strncmp(header.magic, "cxsparse", 8))
- goto fail;
-
- bs->total_sectors = ((uint64_t)be32_to_cpu(header.type.sparse.pagetable_entries) *
- be32_to_cpu(header.type.sparse.pageentry_size)) / 512;
-
- lseek(s->fd, be32_to_cpu(header.type.sparse.pagetable_offset), SEEK_SET);
-
- s->pagetable_entries = be32_to_cpu(header.type.sparse.pagetable_entries);
- s->pagetable = qemu_malloc(s->pagetable_entries * 4);
- if (!s->pagetable)
- goto fail;
- if (read(s->fd, s->pagetable, s->pagetable_entries * 4) !=
- s->pagetable_entries * 4)
- goto fail;
- for (i = 0; i < s->pagetable_entries; i++)
- be32_to_cpus(&s->pagetable[i]);
-
- s->pageentry_size = be32_to_cpu(header.type.sparse.pageentry_size);
-#ifdef CACHE
- s->pageentry_u8 = qemu_malloc(512);
- if (!s->pageentry_u8)
- goto fail;
- s->pageentry_u32 = s->pageentry_u8;
- s->pageentry_u16 = s->pageentry_u8;
- s->last_pagetable = -1;
-#endif
-
- return 0;
- fail:
- close(fd);
- return -1;
-}
-
-static inline int seek_to_sector(BlockDriverState *bs, int64_t sector_num)
-{
- BDRVVPCState *s = bs->opaque;
- uint64_t offset = sector_num * 512;
- uint64_t bitmap_offset, block_offset;
- uint32_t pagetable_index, pageentry_index;
-
- pagetable_index = offset / s->pageentry_size;
- pageentry_index = (offset % s->pageentry_size) / 512;
-
- if (pagetable_index > s->pagetable_entries || s->pagetable[pagetable_index] == 0xffffffff)
- return -1; // not allocated
-
- bitmap_offset = 512 * s->pagetable[pagetable_index];
- block_offset = bitmap_offset + 512 + (512 * pageentry_index);
-
-// printf("sector: %" PRIx64 ", index: %x, offset: %x, bioff: %" PRIx64 ", bloff: %" PRIx64 "\n",
-// sector_num, pagetable_index, pageentry_index,
-// bitmap_offset, block_offset);
-
-// disabled by reason
-#if 0
-#ifdef CACHE
- if (bitmap_offset != s->last_bitmap)
- {
- lseek(s->fd, bitmap_offset, SEEK_SET);
-
- s->last_bitmap = bitmap_offset;
-
- // Scary! Bitmap is stored as big endian 32bit entries,
- // while we used to look it up byte by byte
- read(s->fd, s->pageentry_u8, 512);
- for (i = 0; i < 128; i++)
- be32_to_cpus(&s->pageentry_u32[i]);
- }
-
- if ((s->pageentry_u8[pageentry_index / 8] >> (pageentry_index % 8)) & 1)
- return -1;
-#else
- lseek(s->fd, bitmap_offset + (pageentry_index / 8), SEEK_SET);
-
- read(s->fd, &bitmap_entry, 1);
-
- if ((bitmap_entry >> (pageentry_index % 8)) & 1)
- return -1; // not allocated
-#endif
-#endif
- lseek(s->fd, block_offset, SEEK_SET);
-
- return 0;
-}
-
-static int vpc_read(BlockDriverState *bs, int64_t sector_num,
- uint8_t *buf, int nb_sectors)
-{
- BDRVVPCState *s = bs->opaque;
- int ret;
-
- while (nb_sectors > 0) {
- if (!seek_to_sector(bs, sector_num))
- {
- ret = read(s->fd, buf, 512);
- if (ret != 512)
- return -1;
- }
- else
- memset(buf, 0, 512);
- nb_sectors--;
- sector_num++;
- buf += 512;
- }
- return 0;
-}
-
-static void vpc_close(BlockDriverState *bs)
-{
- BDRVVPCState *s = bs->opaque;
- qemu_free(s->pagetable);
-#ifdef CACHE
- qemu_free(s->pageentry_u8);
-#endif
- close(s->fd);
-}
-
-BlockDriver bdrv_vpc = {
- "vpc",
- sizeof(BDRVVPCState),
- vpc_probe,
- vpc_open,
- vpc_read,
- NULL,
- vpc_close,
-};
generated by cgit v1.1 at 2025-08-04 23:32:25 +0000