text: /*
   * Copyright (C) 2010 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /* dsixda patch */
  #if defined(__CYGWIN__)
  #  define lseek64 lseek
  #  define ftruncate64 ftruncate
  #endif
  
  #include "ext4_utils.h"
  #include "sparse_format.h"
  #include "sparse_crc32.h"
  
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <sys/types.h>
  #include <sys/mman.h>
  #include <unistd.h>
  #include <fcntl.h>
  #include <stdio.h>
  
  #define COPY_BUF_SIZE (1024*1024)
  u8 *copybuf;
  
  /* This will be malloc'ed with the size of blk_sz from the sparse file header */
  u8* zerobuf;
  
  #define SPARSE_HEADER_MAJOR_VER 1
  #define SPARSE_HEADER_LEN       (sizeof(sparse_header_t))
  #define CHUNK_HEADER_LEN (sizeof(chunk_header_t))
  
  void usage()
  {
    fprintf(stderr, "Usage: simg2img <sparse_image_file> <raw_image_file>\n");
  }
  
  static int read_all(int fd, void *buf, size_t len)
  {
  	size_t total = 0;
  	int ret;
  	char *ptr = buf;
  
  	while (total < len) {
  		ret = read(fd, ptr, len - total);
  
  		if (ret < 0)
  			return ret;
  
  		if (ret == 0)
  			return total;
  
  		ptr += ret;
  		total += ret;
  	}
  
  	return total;
  }
  
  static int write_all(int fd, void *buf, size_t len)
  {
  	size_t total = 0;
  	int ret;
  	char *ptr = buf;
  
  	while (total < len) {
  		ret = write(fd, ptr, len - total);
  
  		if (ret < 0)
  			return ret;
  
  		if (ret == 0)
  			return total;
  
  		ptr += ret;
  		total += ret;
  	}
  
  	return total;
  }
  
  int process_raw_chunk(int in, int out, u32 blocks, u32 blk_sz, u32 *crc32)
  {
  	u64 len = (u64)blocks * blk_sz;
  	int ret;
  	int chunk;
  
  	while (len) {
  		chunk = (len > COPY_BUF_SIZE) ? COPY_BUF_SIZE : len;
  		ret = read_all(in, copybuf, chunk);
  		if (ret != chunk) {
  			fprintf(stderr, "read returned an error copying a raw chunk: %d %d\n",
  					ret, chunk);
  			exit(-1);
  		}
  		*crc32 = sparse_crc32(*crc32, copybuf, chunk);
  		ret = write_all(out, copybuf, chunk);
  		if (ret != chunk) {
  			fprintf(stderr, "write returned an error copying a raw chunk\n");
  			exit(-1);
  		}
  		len -= chunk;
  	}
  
  	return blocks;
  }
  
  
  int process_fill_chunk(int in, int out, u32 blocks, u32 blk_sz, u32 *crc32)
  {
  	u64 len = (u64)blocks * blk_sz;
  	int ret;
  	int chunk;
  	u32 fill_val;
  	u32 *fillbuf;
  	unsigned int i;
  
  	/* Fill copy_buf with the fill value */
  	ret = read_all(in, &fill_val, sizeof(fill_val));
  	fillbuf = (u32 *)copybuf;
  	for (i = 0; i < (COPY_BUF_SIZE / sizeof(fill_val)); i++) {
  		fillbuf[i] = fill_val;
  	}
  
  	while (len) {
  		chunk = (len > COPY_BUF_SIZE) ? COPY_BUF_SIZE : len;
  		*crc32 = sparse_crc32(*crc32, copybuf, chunk);
  		ret = write_all(out, copybuf, chunk);
  		if (ret != chunk) {
  			fprintf(stderr, "write returned an error copying a raw chunk\n");
  			exit(-1);
  		}
  		len -= chunk;
  	}
  
  	return blocks;
  }
  
  int process_skip_chunk(int out, u32 blocks, u32 blk_sz, u32 *crc32)
  {
  	/* len needs to be 64 bits, as the sparse file specifies the skip amount
  	 * as a 32 bit value of blocks.
  	 */
  	u64 len = (u64)blocks * blk_sz;
  
  	lseek64(out, len, SEEK_CUR);
  
  	return blocks;
  }
  
  int process_crc32_chunk(int in, u32 crc32)
  {
  	u32 file_crc32;
  	int ret;
  
  	ret = read_all(in, &file_crc32, 4);
  	if (ret != 4) {
  		fprintf(stderr, "read returned an error copying a crc32 chunk\n");
  		exit(-1);
  	}
  
  	if (file_crc32 != crc32) {
  		fprintf(stderr, "computed crc32 of 0x%8.8x, expected 0x%8.8x\n",
  			 crc32, file_crc32);
  		exit(-1);
  	}
  
  	return 0;
  }
  
  int main(int argc, char *argv[])
  {
  	int in;
  	int out;
  	unsigned int i;
  	sparse_header_t sparse_header;
  	chunk_header_t chunk_header;
  	u32 crc32 = 0;
  	u32 total_blocks = 0;
  	int ret;
  
  	if (argc != 3) {
  		usage();
  		exit(-1);
  	}
  
  	if ( (copybuf = malloc(COPY_BUF_SIZE)) == 0) {
  		fprintf(stderr, "Cannot malloc copy buf\n");
  		exit(-1);
  	}
  
  	if (strcmp(argv[1], "-") == 0) {
  		in = STDIN_FILENO;
  	} else {
  		if ((in = open(argv[1], O_RDONLY)) == 0) {
  			fprintf(stderr, "Cannot open input file %s\n", argv[1]);
  			exit(-1);
  		}
  	}
  
  	if (strcmp(argv[2], "-") == 0) {
  		out = STDOUT_FILENO;
  	} else {
  		if ((out = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0666)) == 0) {
  			fprintf(stderr, "Cannot open output file %s\n", argv[2]);
  			exit(-1);
  		}
  	}
  
  	ret = read_all(in, &sparse_header, sizeof(sparse_header));
  	if (ret != sizeof(sparse_header)) {
  		fprintf(stderr, "Error reading sparse file header\n");
  		exit(-1);
  	}
  
  	if (sparse_header.magic != SPARSE_HEADER_MAGIC) {
  		fprintf(stderr, "Bad magic\n");
  		exit(-1);
  	}
  
  	if (sparse_header.major_version != SPARSE_HEADER_MAJOR_VER) {
  		fprintf(stderr, "Unknown major version number\n");
  		exit(-1);
  	}
  
  	if (sparse_header.file_hdr_sz > SPARSE_HEADER_LEN) {
  		/* Skip the remaining bytes in a header that is longer than
  		 * we expected.
  		 */
  		lseek64(in, sparse_header.file_hdr_sz - SPARSE_HEADER_LEN, SEEK_CUR);
  	}
  
  	if ( (zerobuf = malloc(sparse_header.blk_sz)) == 0) {
  		fprintf(stderr, "Cannot malloc zero buf\n");
  		exit(-1);
  	}
  
  	for (i=0; i<sparse_header.total_chunks; i++) {
  		ret = read_all(in, &chunk_header, sizeof(chunk_header));
  		if (ret != sizeof(chunk_header)) {
  			fprintf(stderr, "Error reading chunk header\n");
  			exit(-1);
  		}
  
  		if (sparse_header.chunk_hdr_sz > CHUNK_HEADER_LEN) {
  			/* Skip the remaining bytes in a header that is longer than
  			 * we expected.
  			 */
  			lseek64(in, sparse_header.chunk_hdr_sz - CHUNK_HEADER_LEN, SEEK_CUR);
  		}
  
  		switch (chunk_header.chunk_type) {
  		    case CHUNK_TYPE_RAW:
  			if (chunk_header.total_sz != (sparse_header.chunk_hdr_sz +
  				 (chunk_header.chunk_sz * sparse_header.blk_sz)) ) {
  				fprintf(stderr, "Bogus chunk size for chunk %d, type Raw\n", i);
  				exit(-1);
  			}
  			total_blocks += process_raw_chunk(in, out,
  					 chunk_header.chunk_sz, sparse_header.blk_sz, &crc32);
  			break;
  		    case CHUNK_TYPE_FILL:
  			if (chunk_header.total_sz != (sparse_header.chunk_hdr_sz + sizeof(u32)) ) {
  				fprintf(stderr, "Bogus chunk size for chunk %d, type Fill\n", i);
  				exit(-1);
  			}
  			total_blocks += process_fill_chunk(in, out,
  					 chunk_header.chunk_sz, sparse_header.blk_sz, &crc32);
  			break;
  		    case CHUNK_TYPE_DONT_CARE:
  			if (chunk_header.total_sz != sparse_header.chunk_hdr_sz) {
  				fprintf(stderr, "Bogus chunk size for chunk %d, type Dont Care\n", i);
  				exit(-1);
  			}
  			total_blocks += process_skip_chunk(out,
  					 chunk_header.chunk_sz, sparse_header.blk_sz, &crc32);
  			break;
  		    case CHUNK_TYPE_CRC32:
  			process_crc32_chunk(in, crc32);
  			break;
  		    default:
  			fprintf(stderr, "Unknown chunk type 0x%4.4x\n", chunk_header.chunk_type);
  		}
  
  	}
  
  	/* If the last chunk was a skip, then the code just did a seek, but
  	 * no write, and the file won't actually be the correct size.  This
  	 * will make the file the correct size.  Make sure the offset is
  	 * computed in 64 bits, and the function called can handle 64 bits.
  	 */
  	if (ftruncate64(out, (u64)total_blocks * sparse_header.blk_sz)) {
  		fprintf(stderr, "Error calling ftruncate() to set the image size\n");
  		exit(-1);
  	}
  
  	close(in);
  	close(out);
  
  	if (sparse_header.total_blks != total_blocks) {
  		fprintf(stderr, "Wrote %d blocks, expected to write %d blocks\n",
  			 total_blocks, sparse_header.total_blks);
  		exit(-1);
  	}
  
  	exit(0);
  }
  
  