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zif.cpp

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/** Implementation for gzip-like compression and uncompression interface */

#ifndef DISCARD_TEXT_COMPRESSION

#include <stdio.h>

#include "zlib/zlib.h"

#include "zif.h"

static char zif_error_buf[132];

const char* zif_error(void)

{

return zif_error_buf;

}

int zif_compress(struct zif_t* zs)

{

if (zs == nullptr) {

snprintf(zif_error_buf, sizeof(zif_error_buf),

"FATAL: zif: null zif_t in zif_compress");

return -1;

}

unsigned long cbl = (unsigned long) zs->compressed_buf_len;

int rv = compress((Bytef*) zs->compressed_buf,

&cbl,

(const Bytef*) zs->uncompressed_buf,

(unsigned long) zs->uncompressed_buf_len);

zs->compressed_buf_len = cbl;

if (rv == Z_OK) {

zif_error_buf[0] = '\0';

return 0;

}

else if (rv == Z_MEM_ERROR) {

snprintf(zif_error_buf, sizeof(zif_error_buf),

"FATAL: zif: not enough memory");

return -2;

}

else if (rv == Z_BUF_ERROR) {

snprintf(zif_error_buf, sizeof(zif_error_buf),

"FATAL: zif: output buf too small");

return -3;

}

else {

snprintf(zif_error_buf, sizeof(zif_error_buf),

"FATAL: zif: unexpected error in zif_compress %d", rv);

return -4;

}

}

int zif_uncompress(struct zif_t* zs)

{

if (zs == nullptr) {

snprintf(zif_error_buf, sizeof(zif_error_buf),

"FATAL: zif: null zif_t in zif_uncompress");

return -1;

}

if (zs->compressed_buf_len == 0) {

zs->uncompressed_buf_len = 0;

zs->uncompressed_buf[0] = '\0';

return 0;

}

size_t original_ulen = zs->uncompressed_buf_len;

unsigned long ubl = (unsigned long) zs->uncompressed_buf_len;

int rv = uncompress((Bytef*) zs->uncompressed_buf,

&ubl,

(const Bytef*) zs->compressed_buf,

(unsigned long) zs->compressed_buf_len);

zs->uncompressed_buf_len = ubl;

if (rv == Z_OK) {

zif_error_buf[0] = '\0'; // clear error message

// null terminate if there is space

if (zs->uncompressed_buf_len < original_ulen) {

((char*) zs->uncompressed_buf)[zs->uncompressed_buf_len] = '\0';

}

return 0;

}

else if (rv == Z_MEM_ERROR) {

snprintf(zif_error_buf, sizeof(zif_error_buf),

"FATAL: zif: not enough memory");

return -2;

}

else if (rv == Z_BUF_ERROR) {

snprintf(zif_error_buf, sizeof(zif_error_buf),

"FATAL: zif: output buf too small");

return -3;

}

else if (rv == Z_DATA_ERROR) {

snprintf(zif_error_buf, sizeof(zif_error_buf),

"FATAL: zif: corrupted data");

return -4;

}

else {

snprintf(zif_error_buf, sizeof(zif_error_buf),

"FATAL: zif: unexpected error in zif_uncompress %d", rv);

return -5;

}

}

#endif // DISCARD_TEXT_COMPRESSION