block/dmg.c

/*
 * QEMU Block driver for DMG 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/block_int.h"
#include "qemu/bswap.h"
#include "qemu/module.h"
#include <zlib.h>

enum {
    /* Limit chunk sizes to prevent unreasonable amounts of memory being used
     * or truncating when converting to 32-bit types
     */
    DMG_LENGTHS_MAX = 64 * 1024 * 1024, /* 64 MB */
    DMG_SECTORCOUNTS_MAX = DMG_LENGTHS_MAX / 512,
};

typedef struct BDRVDMGState {
    CoMutex lock;
    /* each chunk contains a certain number of sectors,
     * offsets[i] is the offset in the .dmg file,
     * lengths[i] is the length of the compressed chunk,
     * sectors[i] is the sector beginning at offsets[i],
     * sectorcounts[i] is the number of sectors in that chunk,
     * the sectors array is ordered
     * 0<=i<n_chunks */

    uint32_t n_chunks;
    uint32_t* types;
    uint64_t* offsets;
    uint64_t* lengths;
    uint64_t* sectors;
    uint64_t* sectorcounts;
    uint32_t current_chunk;
    uint8_t *compressed_chunk;
    uint8_t *uncompressed_chunk;
    z_stream zstream;
} BDRVDMGState;

static int dmg_probe(const uint8_t *buf, int buf_size, const char *filename)
{
    int len;

    if (!filename) {
        return 0;
    }

    len = strlen(filename);
    if (len > 4 && !strcmp(filename + len - 4, ".dmg")) {
        return 2;
    }
    return 0;
}

static int read_uint64(BlockDriverState *bs, int64_t offset, uint64_t *result)
{
    uint64_t buffer;
    int ret;

    ret = bdrv_pread(bs->file, offset, &buffer, 8);
    if (ret < 0) {
        return ret;
    }

    *result = be64_to_cpu(buffer);
    return 0;
}

static int read_uint32(BlockDriverState *bs, int64_t offset, uint32_t *result)
{
    uint32_t buffer;
    int ret;

    ret = bdrv_pread(bs->file, offset, &buffer, 4);
    if (ret < 0) {
        return ret;
    }

    *result = be32_to_cpu(buffer);
    return 0;
}

/* Increase max chunk sizes, if necessary.  This function is used to calculate
 * the buffer sizes needed for compressed/uncompressed chunk I/O.
 */
static void update_max_chunk_size(BDRVDMGState *s, uint32_t chunk,
                                  uint32_t *max_compressed_size,
                                  uint32_t *max_sectors_per_chunk)
{
    uint32_t compressed_size = 0;
    uint32_t uncompressed_sectors = 0;

    switch (s->types[chunk]) {
    case 0x80000005: /* zlib compressed */
        compressed_size = s->lengths[chunk];
        uncompressed_sectors = s->sectorcounts[chunk];
        break;
    case 1: /* copy */
        uncompressed_sectors = (s->lengths[chunk] + 511) / 512;
        break;
    case 2: /* zero */
        uncompressed_sectors = s->sectorcounts[chunk];
        break;
    }

    if (compressed_size > *max_compressed_size) {
        *max_compressed_size = compressed_size;
    }
    if (uncompressed_sectors > *max_sectors_per_chunk) {
        *max_sectors_per_chunk = uncompressed_sectors;
    }
}

static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
                    Error **errp)
{
    BDRVDMGState *s = bs->opaque;
    uint64_t info_begin, info_end, last_in_offset, last_out_offset;
    uint32_t count, tmp;
    uint32_t max_compressed_size = 1, max_sectors_per_chunk = 1, i;
    int64_t offset;
    int ret;

    bs->read_only = 1;
    s->n_chunks = 0;
    s->offsets = s->lengths = s->sectors = s->sectorcounts = NULL;

    /* read offset of info blocks */
    offset = bdrv_getlength(bs->file);
    if (offset < 0) {
        ret = offset;
        goto fail;
    }
    offset -= 0x1d8;

    ret = read_uint64(bs, offset, &info_begin);
    if (ret < 0) {
        goto fail;
    } else if (info_begin == 0) {
        ret = -EINVAL;
        goto fail;
    }

    ret = read_uint32(bs, info_begin, &tmp);
    if (ret < 0) {
        goto fail;
    } else if (tmp != 0x100) {
        ret = -EINVAL;
        goto fail;
    }

    ret = read_uint32(bs, info_begin + 4, &count);
    if (ret < 0) {
        goto fail;
    } else if (count == 0) {
        ret = -EINVAL;
        goto fail;
    }
    info_end = info_begin + count;

    offset = info_begin + 0x100;

    /* read offsets */
    last_in_offset = last_out_offset = 0;
    while (offset < info_end) {
        uint32_t type;

        ret = read_uint32(bs, offset, &count);
        if (ret < 0) {
            goto fail;
        } else if (count == 0) {
            ret = -EINVAL;
            goto fail;
        }
        offset += 4;

        ret = read_uint32(bs, offset, &type);
        if (ret < 0) {
            goto fail;
        }

        if (type == 0x6d697368 && count >= 244) {
            size_t new_size;
            uint32_t chunk_count;

            offset += 4;
            offset += 200;

            chunk_count = (count - 204) / 40;
            new_size = sizeof(uint64_t) * (s->n_chunks + chunk_count);
            s->types = g_realloc(s->types, new_size / 2);
            s->offsets = g_realloc(s->offsets, new_size);
            s->lengths = g_realloc(s->lengths, new_size);
            s->sectors = g_realloc(s->sectors, new_size);
            s->sectorcounts = g_realloc(s->sectorcounts, new_size);

            for (i = s->n_chunks; i < s->n_chunks + chunk_count; i++) {
                ret = read_uint32(bs, offset, &s->types[i]);
                if (ret < 0) {
                    goto fail;
                }
                offset += 4;
                if (s->types[i] != 0x80000005 && s->types[i] != 1 &&
                    s->types[i] != 2) {
                    if (s->types[i] == 0xffffffff && i > 0) {
                        last_in_offset = s->offsets[i - 1] + s->lengths[i - 1];
                        last_out_offset = s->sectors[i - 1] +
                                          s->sectorcounts[i - 1];
                    }
                    chunk_count--;
                    i--;
                    offset += 36;
                    continue;
                }
                offset += 4;

                ret = read_uint64(bs, offset, &s->sectors[i]);
                if (ret < 0) {
                    goto fail;
                }
                s->sectors[i] += last_out_offset;
                offset += 8;

                ret = read_uint64(bs, offset, &s->sectorcounts[i]);
                if (ret < 0) {
                    goto fail;
                }
                offset += 8;

                if (s->sectorcounts[i] > DMG_SECTORCOUNTS_MAX) {
                    error_report("sector count %" PRIu64 " for chunk %" PRIu32
                                 " is larger than max (%u)",
                                 s->sectorcounts[i], i, DMG_SECTORCOUNTS_MAX);
                    ret = -EINVAL;
                    goto fail;
                }

                ret = read_uint64(bs, offset, &s->offsets[i]);
                if (ret < 0) {
                    goto fail;
                }
                s->offsets[i] += last_in_offset;
                offset += 8;

                ret = read_uint64(bs, offset, &s->lengths[i]);
                if (ret < 0) {
                    goto fail;
                }
                offset += 8;

                if (s->lengths[i] > DMG_LENGTHS_MAX) {
                    error_report("length %" PRIu64 " for chunk %" PRIu32
                                 " is larger than max (%u)",
                                 s->lengths[i], i, DMG_LENGTHS_MAX);
                    ret = -EINVAL;
                    goto fail;
                }

                update_max_chunk_size(s, i, &max_compressed_size,
                                      &max_sectors_per_chunk);
            }
            s->n_chunks += chunk_count;
        }
    }

    /* initialize zlib engine */
    s->compressed_chunk = g_malloc(max_compressed_size + 1);
    s->uncompressed_chunk = g_malloc(512 * max_sectors_per_chunk);
    if (inflateInit(&s->zstream) != Z_OK) {
        ret = -EINVAL;
        goto fail;
    }

    s->current_chunk = s->n_chunks;

    qemu_co_mutex_init(&s->lock);
    return 0;

fail:
    g_free(s->types);
    g_free(s->offsets);
    g_free(s->lengths);
    g_free(s->sectors);
    g_free(s->sectorcounts);
    g_free(s->compressed_chunk);
    g_free(s->uncompressed_chunk);
    return ret;
}

static inline int is_sector_in_chunk(BDRVDMGState* s,
                uint32_t chunk_num, uint64_t sector_num)
{
    if (chunk_num >= s->n_chunks || s->sectors[chunk_num] > sector_num ||
            s->sectors[chunk_num] + s->sectorcounts[chunk_num] <= sector_num) {
        return 0;
    } else {
        return -1;
    }
}

static inline uint32_t search_chunk(BDRVDMGState *s, uint64_t sector_num)
{
    /* binary search */
    uint32_t chunk1 = 0, chunk2 = s->n_chunks, chunk3;
    while (chunk1 != chunk2) {
        chunk3 = (chunk1 + chunk2) / 2;
        if (s->sectors[chunk3] > sector_num) {
            chunk2 = chunk3;
        } else if (s->sectors[chunk3] + s->sectorcounts[chunk3] > sector_num) {
            return chunk3;
        } else {
            chunk1 = chunk3;
        }
    }
    return s->n_chunks; /* error */
}

static inline int dmg_read_chunk(BlockDriverState *bs, uint64_t sector_num)
{
    BDRVDMGState *s = bs->opaque;

    if (!is_sector_in_chunk(s, s->current_chunk, sector_num)) {
        int ret;
        uint32_t chunk = search_chunk(s, sector_num);

        if (chunk >= s->n_chunks) {
            return -1;
        }

        s->current_chunk = s->n_chunks;
        switch (s->types[chunk]) {
        case 0x80000005: { /* zlib compressed */
            /* we need to buffer, because only the chunk as whole can be
             * inflated. */
            ret = bdrv_pread(bs->file, s->offsets[chunk],
                             s->compressed_chunk, s->lengths[chunk]);
            if (ret != s->lengths[chunk]) {
                return -1;
            }

            s->zstream.next_in = s->compressed_chunk;
            s->zstream.avail_in = s->lengths[chunk];
            s->zstream.next_out = s->uncompressed_chunk;
            s->zstream.avail_out = 512 * s->sectorcounts[chunk];
            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 != 512 * s->sectorcounts[chunk]) {
                return -1;
            }
            break; }
        case 1: /* copy */
            ret = bdrv_pread(bs->file, s->offsets[chunk],
                             s->uncompressed_chunk, s->lengths[chunk]);
            if (ret != s->lengths[chunk]) {
                return -1;
            }
            break;
        case 2: /* zero */
            memset(s->uncompressed_chunk, 0, 512 * s->sectorcounts[chunk]);
            break;
        }
        s->current_chunk = chunk;
    }
    return 0;
}

static int dmg_read(BlockDriverState *bs, int64_t sector_num,
                    uint8_t *buf, int nb_sectors)
{
    BDRVDMGState *s = bs->opaque;
    int i;

    for (i = 0; i < nb_sectors; i++) {
        uint32_t sector_offset_in_chunk;
        if (dmg_read_chunk(bs, sector_num + i) != 0) {
            return -1;
        }
        sector_offset_in_chunk = sector_num + i - s->sectors[s->current_chunk];
        memcpy(buf + i * 512,
               s->uncompressed_chunk + sector_offset_in_chunk * 512, 512);
    }
    return 0;
}

static coroutine_fn int dmg_co_read(BlockDriverState *bs, int64_t sector_num,
                                    uint8_t *buf, int nb_sectors)
{
    int ret;
    BDRVDMGState *s = bs->opaque;
    qemu_co_mutex_lock(&s->lock);
    ret = dmg_read(bs, sector_num, buf, nb_sectors);
    qemu_co_mutex_unlock(&s->lock);
    return ret;
}

static void dmg_close(BlockDriverState *bs)
{
    BDRVDMGState *s = bs->opaque;

    g_free(s->types);
    g_free(s->offsets);
    g_free(s->lengths);
    g_free(s->sectors);
    g_free(s->sectorcounts);
    g_free(s->compressed_chunk);
    g_free(s->uncompressed_chunk);

    inflateEnd(&s->zstream);
}

static BlockDriver bdrv_dmg = {
    .format_name    = "dmg",
    .instance_size  = sizeof(BDRVDMGState),
    .bdrv_probe     = dmg_probe,
    .bdrv_open      = dmg_open,
    .bdrv_read      = dmg_co_read,
    .bdrv_close     = dmg_close,
};

static void bdrv_dmg_init(void)
{
    bdrv_register(&bdrv_dmg);
}

block_init(bdrv_dmg_init);