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#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include "../config.h"
#include "compression.h"
#include "logging.h"
static void
zlib_err(int status)
{
switch (status) {
case Z_OK:
case Z_STREAM_END:
break;
case Z_MEM_ERROR:
err(1, "zlib error: out of memory");
break;
case Z_VERSION_ERROR:
err(1, "zlib error: incompatible library version");
break;
case Z_STREAM_ERROR:
err(1, "zlib error: invalid stream");
break;
case Z_NEED_DICT:
err(1, "zlib error: need dictionary");
break;
case Z_DATA_ERROR:
err(1, "zlib error: corrupted data");
break;
case Z_BUF_ERROR:
err(1, "zlib error: buffer error");
break;
default:
err(1, "zlib error: unknown");
break;
}
}
void
decompress(char *src, size_t src_len, char *dest, size_t dest_len)
{
z_stream d_stream;
d_stream.zalloc = Z_NULL;
d_stream.zfree = Z_NULL;
d_stream.opaque = Z_NULL;
d_stream.next_in = (Bytef *) src;
d_stream.avail_in = src_len;
d_stream.next_out = (Bytef *) dest;
d_stream.avail_out = dest_len;
#ifdef DEBUG_COMPRESSION
debug("Initializing inflation stream...");
#endif
zlib_err(inflateInit2(&d_stream, 15 + 32));
#ifdef DEBUG_COMPRESSION
debug("Inflating %d bytes into up to %d bytes...", src_len, dest_len);
#endif
zlib_err(inflate(&d_stream, Z_NO_FLUSH));
#ifdef DEBUG_COMPRESSION
debug("Ending inflation stream...");
#endif
zlib_err(inflateEnd(&d_stream));
}
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