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#include "uwsgi.h"
char gzheader[10] = { 0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 3 };
extern struct uwsgi_server uwsgi;
char *uwsgi_gzip_chunk(z_stream *z, uint32_t *crc32, char *buf, size_t len, size_t *dlen) {
uwsgi_crc32(crc32, buf, len);
return uwsgi_deflate(z, buf, len, dlen);
}
struct uwsgi_buffer *uwsgi_gzip(char *buf, size_t len) {
z_stream z;
struct uwsgi_buffer *ub = NULL;
uint32_t gzip_crc32 = 0;
char *gzipped = NULL;
char *gzipped0 = NULL;
size_t dlen = 0;
size_t dlen0 = 0;
uwsgi_crc32(&gzip_crc32, NULL, 0);
if (uwsgi_deflate_init(&z, NULL, 0)) return NULL;
uwsgi_crc32(&gzip_crc32, buf, len);
gzipped = uwsgi_deflate(&z, buf, len, &dlen);
if (!gzipped) goto end;
gzipped0 = uwsgi_deflate(&z, NULL, 0, &dlen0);
if (!gzipped0) goto end;
ub = uwsgi_buffer_new(10 + dlen + dlen0 + 8);
if (uwsgi_buffer_append(ub, gzheader, 10)) goto end;
if (uwsgi_buffer_append(ub, gzipped, dlen)) goto end;
if (uwsgi_buffer_append(ub, gzipped0, dlen0)) goto end;
if (uwsgi_buffer_u32le(ub, gzip_crc32)) goto end;
if (uwsgi_buffer_u32le(ub, len)) goto end;
end:
if (gzipped) free(gzipped);
if (gzipped0) free(gzipped0);
deflateEnd(&z);
return ub;
}
struct uwsgi_buffer *uwsgi_zlib_decompress(char *buf, size_t len) {
z_stream z;
z.zalloc = Z_NULL;
z.zfree = Z_NULL;
z.opaque = Z_NULL;
if (inflateInit(&z) != Z_OK) {
return NULL;
}
struct uwsgi_buffer *ub = uwsgi_buffer_new(uwsgi.page_size);
unsigned char out[8192];
z.next_in = (unsigned char *)buf;
z.avail_in = len;
z.next_out = out;
do {
z.avail_out = 8192;
z.next_out = out;
int ret = inflate(&z, Z_NO_FLUSH);
if (ret == Z_STREAM_ERROR || ret == Z_NEED_DICT || ret == Z_DATA_ERROR || ret == Z_MEM_ERROR) {
uwsgi_buffer_destroy(ub);
ub = NULL;
goto end;
}
if (uwsgi_buffer_append(ub, (char *)out, 8192 - z.avail_out)) {
uwsgi_buffer_destroy(ub);
ub = NULL;
goto end;
}
}
while (z.avail_out == 0);
end:
inflateEnd(&z);
return ub;
}
int uwsgi_deflate_init(z_stream *z, char *dict, size_t dict_len) {
z->zalloc = Z_NULL;
z->zfree = Z_NULL;
z->opaque = Z_NULL;
if (deflateInit2(z, Z_DEFAULT_COMPRESSION, Z_DEFLATED, -15, 9, Z_DEFAULT_STRATEGY) != Z_OK) {
//if (deflateInit(z, Z_DEFAULT_COMPRESSION)) {
return -1;
}
if (dict && dict_len) {
if (deflateSetDictionary(z, (Bytef *) dict, dict_len) != Z_OK) {
return -1;
}
}
return 0;
}
int uwsgi_inflate_init(z_stream *z, char *dict, size_t dict_len) {
z->zalloc = Z_NULL;
z->zfree = Z_NULL;
z->opaque = Z_NULL;
if (inflateInit2(z, 16+MAX_WBITS) != Z_OK) {
return -1;
}
if (dict && dict_len) {
if (inflateSetDictionary(z, (Bytef *) dict, dict_len) != Z_OK) {
return -1;
}
}
return 0;
}
int uwsgi_gzip_prepare(z_stream *z, char *dict, size_t dict_len, uint32_t *crc32) {
uwsgi_crc32(crc32, NULL, 0);
if (uwsgi_deflate_init(z, NULL, 0)) return -1;
return 0;
}
// fix and free a gzip stream
int uwsgi_gzip_fix(z_stream *z, uint32_t crc32, struct uwsgi_buffer *ub, size_t len) {
size_t dlen0 = 0;
char *gzipped0 = uwsgi_deflate(z, NULL, 0, &dlen0);
if (!gzipped0) goto end;
if (uwsgi_buffer_append(ub, gzipped0, dlen0)) goto end;
free(gzipped0);
if (uwsgi_buffer_u32le(ub, crc32)) goto end2;
if (uwsgi_buffer_u32le(ub, len)) goto end2;
deflateEnd(z);
return 0;
end:
if (gzipped0) free(gzipped0);
end2:
deflateEnd(z);
return -1;
}
char *uwsgi_deflate(z_stream *z, char *buf, size_t len, size_t *dlen) {
// calculate the amount of bytes needed for output (+30 should be enough)
Bytef *dbuf = uwsgi_malloc(len+30);
z->avail_in = len;
z->next_in = (Bytef *) buf;
z->avail_out = len+30;
z->next_out = dbuf;
if (len > 0) {
if (deflate(z, Z_SYNC_FLUSH) != Z_OK) {
free(dbuf);
return NULL;
}
}
else {
if (deflate(z, Z_FINISH) != Z_STREAM_END) {
free(dbuf);
return NULL;
}
deflateEnd(z);
}
*dlen = (z->next_out - dbuf);
return (char *) dbuf;
}
void uwsgi_crc32(uint32_t *ctx, char *buf, size_t len) {
if (!buf) {
*ctx = crc32(*ctx, Z_NULL, 0);
}
else {
*ctx = crc32(*ctx, (const Bytef *) buf, len);
}
}
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