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/*
* Copyright 2009 CrossWire Bible Society (http://www.crosswire.org)
* CrossWire Bible Society
* P. O. Box 2528
* Tempe, AZ 85280-2528
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
*/
#include <entriesblk.h>
#include <stdlib.h>
#include <string.h>
SWORD_NAMESPACE_START
const int EntriesBlock::METAHEADERSIZE = 4;
// count(4);
const int EntriesBlock::METAENTRYSIZE = 8;
// offset(4); size(4);
EntriesBlock::EntriesBlock(const char *iBlock, unsigned long size) {
if (size) {
block = (char *)calloc(1, size);
memcpy(block, iBlock, size);
}
else {
block = (char *)calloc(1, sizeof(__u32));
}
}
EntriesBlock::EntriesBlock() {
block = (char *)calloc(1, sizeof(__u32));
}
EntriesBlock::~EntriesBlock() {
free(block);
}
void EntriesBlock::setCount(int count) {
__u32 rawCount = archtosword32(count);
memcpy(block, &rawCount, sizeof(__u32));
}
int EntriesBlock::getCount() {
__u32 count = 0;
memcpy(&count, block, sizeof(__u32));
count = swordtoarch32(count);
return count;
}
void EntriesBlock::getMetaEntry(int index, unsigned long *offset, unsigned long *size) {
__u32 rawOffset = 0;
__u32 rawSize = 0;
*offset = 0;
*size = 0;
if (index >= getCount()) // assert index < count
return;
// first 4 bytes is count, each 6 bytes after is each meta entry
memcpy(&rawOffset, block + METAHEADERSIZE + (index * METAENTRYSIZE), sizeof(rawOffset));
memcpy(&rawSize, block + METAHEADERSIZE + (index * METAENTRYSIZE) + sizeof(rawOffset), sizeof(rawSize));
*offset = (unsigned long)swordtoarch32(rawOffset);
*size = (unsigned long)swordtoarch32(rawSize);
}
void EntriesBlock::setMetaEntry(int index, unsigned long offset, unsigned long size) {
__u32 rawOffset = archtosword32(offset);
__u32 rawSize = archtosword32(size);
if (index >= getCount()) // assert index < count
return;
// first 4 bytes is count, each 6 bytes after is each meta entry
memcpy(block + METAHEADERSIZE + (index * METAENTRYSIZE), &rawOffset, sizeof(rawOffset));
memcpy(block + METAHEADERSIZE + (index * METAENTRYSIZE) + sizeof(rawOffset), &rawSize, sizeof(rawSize));
}
const char *EntriesBlock::getRawData(unsigned long *retSize) {
unsigned long max = 4;
int loop;
unsigned long offset;
unsigned long size;
for (loop = 0; loop < getCount(); loop++) {
getMetaEntry(loop, &offset, &size);
max = ((offset + size) > max) ? (offset + size) : max;
}
*retSize = max;
return block;
}
int EntriesBlock::addEntry(const char *entry) {
unsigned long dataSize;
getRawData(&dataSize);
unsigned long len = strlen(entry);
unsigned long offset;
unsigned long size;
int count = getCount();
unsigned long dataStart = METAHEADERSIZE + (count * METAENTRYSIZE);
// new meta entry + new data size + 1 because null
block = (char *)realloc(block, dataSize + METAENTRYSIZE + len + 1);
// shift right to make room for new meta entry
memmove(block + dataStart + METAENTRYSIZE, block + dataStart, dataSize - dataStart);
for (int loop = 0; loop < count; loop++) {
getMetaEntry(loop, &offset, &size);
if (offset) { // if not a deleted entry
offset += METAENTRYSIZE;
setMetaEntry(loop, offset, size);
}
}
offset = dataSize; // original dataSize before realloc
size = len + 1;
// add our text to the end
memcpy(block + offset + METAENTRYSIZE, entry, size);
// increment count
setCount(count + 1);
// add our meta entry
setMetaEntry(count, offset + METAENTRYSIZE, size);
// return index of our new entry
return count;
}
const char *EntriesBlock::getEntry(int entryIndex) {
unsigned long offset;
unsigned long size;
static const char *empty = "";
getMetaEntry(entryIndex, &offset, &size);
return (offset) ? block+offset : empty;
}
unsigned long EntriesBlock::getEntrySize(int entryIndex) {
unsigned long offset;
unsigned long size;
getMetaEntry(entryIndex, &offset, &size);
return (offset) ? size : 0;
}
void EntriesBlock::removeEntry(int entryIndex) {
unsigned long offset;
unsigned long size, size2;
unsigned long dataSize;
getRawData(&dataSize);
getMetaEntry(entryIndex, &offset, &size);
int count = getCount();
if (!offset) // already deleted
return;
// shift left to retrieve space used for old entry
memmove(block + offset, block + offset + size, dataSize - (offset + size));
// fix offset for all entries after our entry that were shifted left
for (int loop = entryIndex + 1; loop < count; loop++) {
getMetaEntry(loop, &offset, &size2);
if (offset) { // if not a deleted entry
offset -= size;
setMetaEntry(loop, offset, size2);
}
}
// zero out our meta entry
setMetaEntry(entryIndex, 0L, 0);
}
SWORD_NAMESPACE_END
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