zstd/decompress/zstd_decompress.c

44  *  (defined as: no byte read from input, and no byte flushed to output)
872             /* We are decompressing in-place. Limit the output pointer so that we
874              * fail decompression if the input & output pointers aren't spaced
879              * literals in the output buffer, after the block it is decompressing.
1069  * output, and avoid copying the input.
1776     /* space is needed to store the litbuffer after the output of a given block without stomping the extDict of a previous run, as well as to cover both windows against wildcopy*/
1826 /* Checks that the output buffer hasn't changed if ZSTD_obm_stable is used. */
1827 static size_t ZSTD_checkOutBuffer(ZSTD_DStream const* zds, ZSTD_outBuffer const* output)
1839     if (expect.dst == output->dst && expect.pos == output->pos && expect.size == output->size)
1841     RETURN_ERROR(dstBuffer_wrong, "ZSTD_d_stableOutBuffer enabled but output differs!");
1845  * and updates the stage and the output buffer state. This call is extracted so it can be
1865         /* Write directly into the output buffer */
1878 size_t ZSTD_decompressStream(ZSTD_DStream* zds, ZSTD_outBuffer* output, ZSTD_inBuffer* input)
1884     char* const dst = (char*)output->dst;
1885     char* const ostart = output->pos != 0 ? dst + output->pos : dst;
1886     char* const oend = output->size != 0 ? dst + output->size : dst;
1897         output->pos > output->size,
1900         (U32)output->pos, (U32)output->size);
1902     FORWARD_IF_ERROR(ZSTD_checkOutBuffer(zds, output), "");
1912             zds->expectedOutBuffer = *output;
1960             /* Check output buffer is large enough for ZSTD_odm_stable. */
2097     output->pos = (size_t)(op - (char*)(output->dst));
2099     /* Update the expected output buffer for ZSTD_obm_stable. */
2100     zds->expectedOutBuffer = *output;
2114             if (zds->outEnd == zds->outStart) {  /* output fully flushed */
2125             if (!zds->hostageByte) { /* output not fully flushed; keep last byte as hostage; will be released when all output is flushed */
2143     ZSTD_outBuffer output = { dst, dstCapacity, *dstPos };
2146     size_t const cErr = ZSTD_decompressStream(dctx, &output, &input);
2147     *dstPos = output.pos;