[qemu.git] / 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>

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=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;
}

static int dmg_open(BlockDriverState *bs, int flags)
{
    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) {
	    int new_size, 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) {
			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;

                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]>max_compressed_size)
		    max_compressed_size = s->lengths[i];
		if(s->sectorcounts[i]>max_sectors_per_chunk)
		    max_sectors_per_chunk = s->sectorcounts[i];
	    }
	    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,int 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,int 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, int 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 */
	    int i;

	    /* we need to buffer, because only the chunk as whole can be
	     * inflated. */
	    i=0;
	    do {
                ret = bdrv_pread(bs->file, s->offsets[chunk] + i,
                                 s->compressed_chunk+i, s->lengths[chunk]-i);
		if(ret<0 && errno==EINTR)
		    ret=0;
		i+=ret;
	    } while(ret>=0 && ret+i<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);
Commit	Line	Data
585d0ed9 FB	1	/*
585d0ed9 FB	2	* QEMU Block driver for DMG images
5fafdf24	3	*
585d0ed9	4	* Copyright (c) 2004 Johannes E. Schindelin
5fafdf24	5	*
585d0ed9 FB	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
faf07963	24	#include "qemu-common.h"
737e150e	25	#include "block/block_int.h"
1de7afc9 PB	26	#include "qemu/bswap.h"
1de7afc9 PB	27	#include "qemu/module.h"
585d0ed9 FB	28	#include <zlib.h>
	29
	30	typedef struct BDRVDMGState {
848c66e8	31	CoMutex lock;
585d0ed9 FB	32	/* each chunk contains a certain number of sectors,
	33	* offsets[i] is the offset in the .dmg file,
	34	* lengths[i] is the length of the compressed chunk,
	35	* sectors[i] is the sector beginning at offsets[i],
	36	* sectorcounts[i] is the number of sectors in that chunk,
	37	* the sectors array is ordered
	38	* 0<=i<n_chunks */
	39
	40	uint32_t n_chunks;
	41	uint32_t* types;
	42	uint64_t* offsets;
	43	uint64_t* lengths;
	44	uint64_t* sectors;
	45	uint64_t* sectorcounts;
	46	uint32_t current_chunk;
28a5c9c8 FB	47	uint8_t *compressed_chunk;
28a5c9c8 FB	48	uint8_t *uncompressed_chunk;
585d0ed9 FB	49	z_stream zstream;
	50	} BDRVDMGState;
	51
	52	static int dmg_probe(const uint8_t buf, int buf_size, const char filename)
	53	{
	54	int len=strlen(filename);
	55	if(len>4 && !strcmp(filename+len-4,".dmg"))
	56	return 2;
	57	return 0;
	58	}
	59
69d34a36	60	static int read_uint64(BlockDriverState bs, int64_t offset, uint64_t result)
585d0ed9	61	{
69d34a36 KW	62	uint64_t buffer;
	63	int ret;
	64
	65	ret = bdrv_pread(bs->file, offset, &buffer, 8);
	66	if (ret < 0) {
	67	return ret;
	68	}
	69
	70	*result = be64_to_cpu(buffer);
	71	return 0;
585d0ed9 FB	72	}
585d0ed9 FB	73
69d34a36	74	static int read_uint32(BlockDriverState bs, int64_t offset, uint32_t result)
585d0ed9	75	{
69d34a36 KW	76	uint32_t buffer;
	77	int ret;
	78
	79	ret = bdrv_pread(bs->file, offset, &buffer, 4);
	80	if (ret < 0) {
	81	return ret;
	82	}
	83
	84	*result = be32_to_cpu(buffer);
	85	return 0;
585d0ed9 FB	86	}
585d0ed9 FB	87
64a31d5c	88	static int dmg_open(BlockDriverState *bs, int flags)
585d0ed9 FB	89	{
585d0ed9 FB	90	BDRVDMGState *s = bs->opaque;
69d34a36 KW	91	uint64_t info_begin,info_end,last_in_offset,last_out_offset;
69d34a36 KW	92	uint32_t count, tmp;
585d0ed9	93	uint32_t max_compressed_size=1,max_sectors_per_chunk=1,i;
16cdf7ce	94	int64_t offset;
69d34a36	95	int ret;
585d0ed9	96
585d0ed9 FB	97	bs->read_only = 1;
585d0ed9 FB	98	s->n_chunks = 0;
511d2b14	99	s->offsets = s->lengths = s->sectors = s->sectorcounts = NULL;
3b46e624	100
585d0ed9	101	/* read offset of info blocks */
64a31d5c	102	offset = bdrv_getlength(bs->file);
16cdf7ce	103	if (offset < 0) {
69d34a36	104	ret = offset;
1559ca00	105	goto fail;
585d0ed9	106	}
64a31d5c	107	offset -= 0x1d8;
1559ca00	108
69d34a36 KW	109	ret = read_uint64(bs, offset, &info_begin);
	110	if (ret < 0) {
	111	goto fail;
	112	} else if (info_begin == 0) {
	113	ret = -EINVAL;
	114	goto fail;
16cdf7ce CH	115	}
16cdf7ce CH	116
69d34a36 KW	117	ret = read_uint32(bs, info_begin, &tmp);
	118	if (ret < 0) {
	119	goto fail;
	120	} else if (tmp != 0x100) {
	121	ret = -EINVAL;
16cdf7ce CH	122	goto fail;
	123	}
	124
69d34a36 KW	125	ret = read_uint32(bs, info_begin + 4, &count);
	126	if (ret < 0) {
	127	goto fail;
	128	} else if (count == 0) {
	129	ret = -EINVAL;
16cdf7ce CH	130	goto fail;
	131	}
	132	info_end = info_begin + count;
	133
	134	offset = info_begin + 0x100;
585d0ed9 FB	135
	136	/* read offsets */
	137	last_in_offset = last_out_offset = 0;
16cdf7ce	138	while (offset < info_end) {
995179f1 FB	139	uint32_t type;
995179f1 FB	140
69d34a36 KW	141	ret = read_uint32(bs, offset, &count);
	142	if (ret < 0) {
	143	goto fail;
	144	} else if (count == 0) {
	145	ret = -EINVAL;
	146	goto fail;
	147	}
16cdf7ce CH	148	offset += 4;
16cdf7ce CH	149
69d34a36 KW	150	ret = read_uint32(bs, offset, &type);
	151	if (ret < 0) {
	152	goto fail;
	153	}
	154
16cdf7ce	155	if (type == 0x6d697368 && count >= 244) {
585d0ed9	156	int new_size, chunk_count;
16cdf7ce CH	157
	158	offset += 4;
	159	offset += 200;
	160
585d0ed9 FB	161	chunk_count = (count-204)/40;
585d0ed9 FB	162	new_size = sizeof(uint64_t) * (s->n_chunks + chunk_count);
7267c094 AL	163	s->types = g_realloc(s->types, new_size/2);
	164	s->offsets = g_realloc(s->offsets, new_size);
	165	s->lengths = g_realloc(s->lengths, new_size);
	166	s->sectors = g_realloc(s->sectors, new_size);
	167	s->sectorcounts = g_realloc(s->sectorcounts, new_size);
585d0ed9	168
69d34a36 KW	169	for (i = s->n_chunks; i < s->n_chunks + chunk_count; i++) {
	170	ret = read_uint32(bs, offset, &s->types[i]);
	171	if (ret < 0) {
	172	goto fail;
	173	}
16cdf7ce	174	offset += 4;
585d0ed9 FB	175	if(s->types[i]!=0x80000005 && s->types[i]!=1 && s->types[i]!=2) {
	176	if(s->types[i]==0xffffffff) {
	177	last_in_offset = s->offsets[i-1]+s->lengths[i-1];
	178	last_out_offset = s->sectors[i-1]+s->sectorcounts[i-1];
	179	}
	180	chunk_count--;
	181	i--;
16cdf7ce	182	offset += 36;
585d0ed9 FB	183	continue;
585d0ed9 FB	184	}
16cdf7ce CH	185	offset += 4;
16cdf7ce CH	186
69d34a36 KW	187	ret = read_uint64(bs, offset, &s->sectors[i]);
	188	if (ret < 0) {
	189	goto fail;
	190	}
	191	s->sectors[i] += last_out_offset;
	192	offset += 8;
16cdf7ce	193
69d34a36 KW	194	ret = read_uint64(bs, offset, &s->sectorcounts[i]);
	195	if (ret < 0) {
	196	goto fail;
	197	}
	198	offset += 8;
16cdf7ce	199
69d34a36 KW	200	ret = read_uint64(bs, offset, &s->offsets[i]);
	201	if (ret < 0) {
	202	goto fail;
	203	}
	204	s->offsets[i] += last_in_offset;
	205	offset += 8;
16cdf7ce	206
69d34a36 KW	207	ret = read_uint64(bs, offset, &s->lengths[i]);
	208	if (ret < 0) {
	209	goto fail;
	210	}
	211	offset += 8;
16cdf7ce	212
585d0ed9 FB	213	if(s->lengths[i]>max_compressed_size)
	214	max_compressed_size = s->lengths[i];
	215	if(s->sectorcounts[i]>max_sectors_per_chunk)
	216	max_sectors_per_chunk = s->sectorcounts[i];
	217	}
	218	s->n_chunks+=chunk_count;
	219	}
	220	}
	221
	222	/* initialize zlib engine */
7267c094 AL	223	s->compressed_chunk = g_malloc(max_compressed_size+1);
7267c094 AL	224	s->uncompressed_chunk = g_malloc(512*max_sectors_per_chunk);
69d34a36 KW	225	if(inflateInit(&s->zstream) != Z_OK) {
	226	ret = -EINVAL;
	227	goto fail;
	228	}
585d0ed9 FB	229
585d0ed9 FB	230	s->current_chunk = s->n_chunks;
3b46e624	231
848c66e8	232	qemu_co_mutex_init(&s->lock);
585d0ed9	233	return 0;
69d34a36	234
1559ca00	235	fail:
69d34a36 KW	236	g_free(s->types);
	237	g_free(s->offsets);
	238	g_free(s->lengths);
	239	g_free(s->sectors);
	240	g_free(s->sectorcounts);
	241	g_free(s->compressed_chunk);
	242	g_free(s->uncompressed_chunk);
	243	return ret;
585d0ed9 FB	244	}
	245
	246	static inline int is_sector_in_chunk(BDRVDMGState* s,
	247	uint32_t chunk_num,int sector_num)
	248	{
	249	if(chunk_num>=s->n_chunks \|\| s->sectors[chunk_num]>sector_num \|\|
	250	s->sectors[chunk_num]+s->sectorcounts[chunk_num]<=sector_num)
	251	return 0;
	252	else
	253	return -1;
	254	}
	255
	256	static inline uint32_t search_chunk(BDRVDMGState* s,int sector_num)
	257	{
	258	/* binary search */
	259	uint32_t chunk1=0,chunk2=s->n_chunks,chunk3;
	260	while(chunk1!=chunk2) {
	261	chunk3 = (chunk1+chunk2)/2;
	262	if(s->sectors[chunk3]>sector_num)
	263	chunk2 = chunk3;
	264	else if(s->sectors[chunk3]+s->sectorcounts[chunk3]>sector_num)
	265	return chunk3;
	266	else
	267	chunk1 = chunk3;
	268	}
	269	return s->n_chunks; /* error */
	270	}
	271
64a31d5c	272	static inline int dmg_read_chunk(BlockDriverState *bs, int sector_num)
585d0ed9	273	{
64a31d5c CH	274	BDRVDMGState *s = bs->opaque;
64a31d5c CH	275
585d0ed9 FB	276	if(!is_sector_in_chunk(s,s->current_chunk,sector_num)) {
	277	int ret;
	278	uint32_t chunk = search_chunk(s,sector_num);
	279
	280	if(chunk>=s->n_chunks)
	281	return -1;
	282
	283	s->current_chunk = s->n_chunks;
	284	switch(s->types[chunk]) {
	285	case 0x80000005: { /* zlib compressed */
	286	int i;
	287
585d0ed9 FB	288	/* we need to buffer, because only the chunk as whole can be
	289	* inflated. */
	290	i=0;
	291	do {
64a31d5c CH	292	ret = bdrv_pread(bs->file, s->offsets[chunk] + i,
64a31d5c CH	293	s->compressed_chunk+i, s->lengths[chunk]-i);
585d0ed9 FB	294	if(ret<0 && errno==EINTR)
	295	ret=0;
	296	i+=ret;
	297	} while(ret>=0 && ret+i<s->lengths[chunk]);
	298
	299	if (ret != s->lengths[chunk])
	300	return -1;
5fafdf24	301
585d0ed9 FB	302	s->zstream.next_in = s->compressed_chunk;
	303	s->zstream.avail_in = s->lengths[chunk];
	304	s->zstream.next_out = s->uncompressed_chunk;
	305	s->zstream.avail_out = 512*s->sectorcounts[chunk];
	306	ret = inflateReset(&s->zstream);
	307	if(ret != Z_OK)
	308	return -1;
	309	ret = inflate(&s->zstream, Z_FINISH);
	310	if(ret != Z_STREAM_END \|\| s->zstream.total_out != 512*s->sectorcounts[chunk])
	311	return -1;
	312	break; }
	313	case 1: /* copy */
64a31d5c CH	314	ret = bdrv_pread(bs->file, s->offsets[chunk],
64a31d5c CH	315	s->uncompressed_chunk, s->lengths[chunk]);
585d0ed9 FB	316	if (ret != s->lengths[chunk])
	317	return -1;
	318	break;
	319	case 2: /* zero */
	320	memset(s->uncompressed_chunk, 0, 512*s->sectorcounts[chunk]);
	321	break;
	322	}
	323	s->current_chunk = chunk;
	324	}
	325	return 0;
	326	}
	327
5fafdf24	328	static int dmg_read(BlockDriverState *bs, int64_t sector_num,
585d0ed9 FB	329	uint8_t *buf, int nb_sectors)
	330	{
	331	BDRVDMGState *s = bs->opaque;
	332	int i;
	333
	334	for(i=0;i<nb_sectors;i++) {
	335	uint32_t sector_offset_in_chunk;
64a31d5c	336	if(dmg_read_chunk(bs, sector_num+i) != 0)
585d0ed9 FB	337	return -1;
	338	sector_offset_in_chunk = sector_num+i-s->sectors[s->current_chunk];
	339	memcpy(buf+i512,s->uncompressed_chunk+sector_offset_in_chunk512,512);
	340	}
	341	return 0;
	342	}
	343
2914caa0 PB	344	static coroutine_fn int dmg_co_read(BlockDriverState *bs, int64_t sector_num,
	345	uint8_t *buf, int nb_sectors)
	346	{
	347	int ret;
	348	BDRVDMGState *s = bs->opaque;
	349	qemu_co_mutex_lock(&s->lock);
	350	ret = dmg_read(bs, sector_num, buf, nb_sectors);
	351	qemu_co_mutex_unlock(&s->lock);
	352	return ret;
	353	}
	354
585d0ed9 FB	355	static void dmg_close(BlockDriverState *bs)
	356	{
	357	BDRVDMGState *s = bs->opaque;
4f8aa2e1 KW	358
	359	g_free(s->types);
	360	g_free(s->offsets);
	361	g_free(s->lengths);
	362	g_free(s->sectors);
	363	g_free(s->sectorcounts);
	364	g_free(s->compressed_chunk);
	365	g_free(s->uncompressed_chunk);
	366
585d0ed9 FB	367	inflateEnd(&s->zstream);
	368	}
	369
5efa9d5a	370	static BlockDriver bdrv_dmg = {
e60f469c AJ	371	.format_name = "dmg",
	372	.instance_size = sizeof(BDRVDMGState),
	373	.bdrv_probe = dmg_probe,
64a31d5c	374	.bdrv_open = dmg_open,
2914caa0	375	.bdrv_read = dmg_co_read,
e60f469c	376	.bdrv_close = dmg_close,
585d0ed9	377	};
5efa9d5a AL	378
	379	static void bdrv_dmg_init(void)
	380	{
	381	bdrv_register(&bdrv_dmg);
	382	}
	383
	384	block_init(bdrv_dmg_init);