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/*
* Written in 2009 by Lloyd Hilaiel
*
* License
*
* All the cruft you find here is public domain. You don't have to credit
* anyone to use this code, but my personal request is that you mention
* Igor Pavlov for his hard, high quality work.
*
* simple.c - a wrapper around easylzma to compress/decompress to memory
*/
#include "simple.h"
#include <string.h>
#include <assert.h>
struct dataStream
{
const unsigned char *inData;
size_t inLen;
unsigned char *outData;
size_t outLen;
};
static int inputCallback(void *ctx, void *buf, size_t *size)
{
size_t rd = 0;
struct dataStream *ds = (struct dataStream *)ctx;
assert(ds != NULL);
rd = (ds->inLen < *size) ? ds->inLen : *size;
if (rd > 0)
{
memcpy(buf, (void *)ds->inData, rd);
ds->inData += rd;
ds->inLen -= rd;
}
*size = rd;
return 0;
}
static size_t outputCallback(void *ctx, const void *buf, size_t size)
{
struct dataStream *ds = (struct dataStream *)ctx;
assert(ds != NULL);
if (size > 0)
{
ds->outData = realloc(ds->outData, ds->outLen + size);
memcpy((void *)(ds->outData + ds->outLen), buf, size);
ds->outLen += size;
}
return size;
}
int simpleCompress(elzma_file_format format, const unsigned char *inData, size_t inLen,
unsigned char **outData, size_t *outLen)
{
int rc;
elzma_compress_handle hand;
/* allocate compression handle */
hand = elzma_compress_alloc();
assert(hand != NULL);
rc = elzma_compress_config(hand, ELZMA_LC_DEFAULT, ELZMA_LP_DEFAULT, ELZMA_PB_DEFAULT, 5,
(1 << 20) /* 1mb */, format, inLen);
if (rc != ELZMA_E_OK)
{
elzma_compress_free(&hand);
return rc;
}
/* now run the compression */
{
struct dataStream ds;
ds.inData = inData;
ds.inLen = inLen;
ds.outData = NULL;
ds.outLen = 0;
rc = elzma_compress_run(hand, inputCallback, (void *)&ds, outputCallback, (void *)&ds,
NULL, NULL);
if (rc != ELZMA_E_OK)
{
if (ds.outData != NULL)
free(ds.outData);
elzma_compress_free(&hand);
return rc;
}
*outData = ds.outData;
*outLen = ds.outLen;
}
return rc;
}
int simpleDecompress(elzma_file_format format, const unsigned char *inData, size_t inLen,
unsigned char **outData, size_t *outLen)
{
int rc;
elzma_decompress_handle hand;
hand = elzma_decompress_alloc();
/* now run the compression */
{
struct dataStream ds;
ds.inData = inData;
ds.inLen = inLen;
ds.outData = NULL;
ds.outLen = 0;
rc = elzma_decompress_run(hand, inputCallback, (void *)&ds, outputCallback, (void *)&ds,
format);
if (rc != ELZMA_E_OK)
{
if (ds.outData != NULL)
free(ds.outData);
elzma_decompress_free(&hand);
return rc;
}
*outData = ds.outData;
*outLen = ds.outLen;
}
return rc;
}
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