/* ************************************************************************************************************ * * function * * name : * * parmeters : * * return : * * note : 返回hash值 * * ************************************************************************************************************ */ unsigned int HashString( unsigned char *str, unsigned int dwHashType, unsigned int length ) { // unsigned char *key = (unsigned char *)str; // int ch; // // while( length > 0 ) // { // ch = *key++; // seed1 = cryptTable[(dwHashType << 8) + ch] ^ (seed1 + seed2); // seed2 = ch + seed1 + seed2 + (seed2 << 5) + 3; // length --; // } // // return seed1; key += verify_sum((void *)str, length); return (unsigned int)key; }
/* ************************************************************************************************************ * * DRAM_Write * * 函数名称: * * 参数列表: * * 返回值 : * * 说明 : * * ************************************************************************************************************ */ int unsparse_direct_write(void *pbuf, int length) { int unenough_length; int this_rest_size; int tmp_down_size; char *tmp_buf, *tmp_dest_buf; chunk_header_t *chunk; //首先计算传进的数据的校验和 android_format_checksum += verify_sum(pbuf, length); this_rest_size = last_rest_size + length; tmp_buf = (char *)pbuf - last_rest_size; last_rest_size = 0; while(this_rest_size > 0) { switch(sparse_format_type) { case SPARSE_FORMAT_TYPE_TOTAL_HEAD: { memcpy(&globl_header, tmp_buf, sizeof(sparse_header_t)); this_rest_size -= sizeof(sparse_header_t); tmp_buf += sizeof(sparse_header_t); sparse_format_type = SPARSE_FORMAT_TYPE_CHUNK_HEAD; break; } case SPARSE_FORMAT_TYPE_CHUNK_HEAD: { if(this_rest_size < sizeof(chunk_header_t)) { __inf("sparse: chunk head data is not enough\n"); last_rest_size = this_rest_size; tmp_dest_buf = (char *)pbuf - this_rest_size; memcpy(tmp_dest_buf, tmp_buf, this_rest_size); this_rest_size = 0; break; } chunk = (chunk_header_t *)tmp_buf; /* move to next chunk */ tmp_buf += sizeof(chunk_header_t); //此时tmp_buf已经指向下一个chunk或者data起始地址 this_rest_size -= sizeof(chunk_header_t); //剩余的数据长度 chunk_length = chunk->chunk_sz * globl_header.blk_sz; //当前数据块需要写入的数据长度 //__inf("chunk index = %d\n", chunk_count ++); switch (chunk->chunk_type) { case CHUNK_TYPE_RAW: if (chunk->total_sz != (chunk_length + sizeof(chunk_header_t))) { __inf("sparse: bad chunk size for chunk %d, type Raw\n", chunk_count); return -1; } //这里不处理数据部分,转到下一个状态 sparse_format_type = SPARSE_FORMAT_TYPE_CHUNK_DATA; break; case CHUNK_TYPE_DONT_CARE: if (chunk->total_sz != sizeof(chunk_header_t)) { __inf("sparse: bogus DONT CARE chunk\n"); return -1; } flash_start += (chunk_length>>9); sparse_format_type = SPARSE_FORMAT_TYPE_CHUNK_HEAD; break; default: __inf("sparse: unknown chunk ID %x\n", chunk->chunk_type); return -1; } break; } case SPARSE_FORMAT_TYPE_CHUNK_DATA: { //首先判断数据是否足够当前chunk所需,如果不足,则计算出还需要的数据长度 unenough_length = (chunk_length >= this_rest_size)? (chunk_length - this_rest_size):0; if(!unenough_length) { //数据足够,直接写入 if(sprite_flash_write(flash_start, chunk_length>>9, tmp_buf)) { __inf("sparse: flash write failed\n"); return -1; } if(chunk_length & 511) { __inf("data is not sector align 0\n"); return -1; } flash_start += (chunk_length>>9); tmp_buf += chunk_length; this_rest_size -= chunk_length; chunk_length = 0; sparse_format_type = SPARSE_FORMAT_TYPE_CHUNK_HEAD; } else //存在缺失数据的情况 { if(this_rest_size < 8 * 1024) //先看已有数据是否不足8k { //当不足时,把这笔数据放到下一笔数据的前部,等待下一次处理 tmp_dest_buf = (char *)pbuf - this_rest_size; memcpy(tmp_dest_buf, tmp_buf, this_rest_size); last_rest_size = this_rest_size; this_rest_size = 0; break; } //当已有数据超过16k时 //当缺失数据长度不足4k时,可能只缺几十个字节 if(unenough_length < 4 * 1024) { //采用拼接方法,先烧写部分已有数据,然后在下一次把未烧写的已有数据和缺失数据一起烧录 tmp_down_size = this_rest_size + unenough_length - 4 * 1024; } else //这里处理缺失数据超过8k(包含)的情况,同时已有数据也超过16k { //直接烧录当前全部数据; tmp_down_size = this_rest_size & (~(512 -1)); //扇区对齐 } if(sprite_flash_write(flash_start, tmp_down_size>>9, tmp_buf)) { __inf("sparse: flash write failed\n"); return -1; } if(tmp_down_size & 511) { __inf("data is not sector align 1\n"); return -1; } tmp_buf += tmp_down_size; flash_start += (tmp_down_size>>9); chunk_length -= tmp_down_size; this_rest_size -= tmp_down_size; tmp_dest_buf = (char *)pbuf - this_rest_size; memcpy(tmp_dest_buf, tmp_buf, this_rest_size); last_rest_size = this_rest_size; this_rest_size = 0; sparse_format_type = SPARSE_FORMAT_TYPE_CHUNK_DATA; } break; } default: { __inf("sparse: unknown status\n"); return -1; } } }