99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
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//Based on https://github.com/richgel999/miniz/blob/master/examples/example5.c (Public domain, April 11 2012, Rich Geldreich, richgel99@gmail.com)
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#include <stdbool.h>
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#include <stdio.h>
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//Include miniz, disabling what we don't need
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#define MINIZ_NO_STDIO
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#define MINIZ_NO_ARCHIVE_APIS
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#define MINIZ_NO_TIME
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#define MINIZ_NO_ZLIB_APIS
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#define MINIZ_NO_MALLOC
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#include "../lib/miniz/miniz.h"
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#include "inflate.h"
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//The compressed and uncompressed buffer arrays
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char* comprBuffer;
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char* uncomprBuffer;
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//Position of the inflater in the buffer arrays
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char* comprBufferNext;
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char* uncomprBufferNext;
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//Buffer lengths
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unsigned long uncomprBufferSize;
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unsigned long remainingInput;
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unsigned long spaceInOutput;
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//Internal variables used by miniz
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tinfl_decompressor inflator;
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tdefl_status status;
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size_t in_bytes, out_bytes;
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void inflateInit(char* comprBufferIn, char* uncomprBufferIn, unsigned long uncomprBufferSizeIn) {
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comprBuffer = comprBufferIn;
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uncomprBuffer = uncomprBufferIn;
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uncomprBufferSize = uncomprBufferSizeIn;
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tinfl_init(&inflator);
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}
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struct InflateOutput inflateInflate(unsigned long numInputBytes, bool hasMoreBytes) {
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if (numInputBytes == 0) {
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//continue in input buffer where we were before
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} else {
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//go back to beginning of input buffer
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remainingInput = numInputBytes;
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comprBufferNext = comprBuffer;
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}
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//output buffer has been emptied
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spaceInOutput = uncomprBufferSize;
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uncomprBufferNext = uncomprBuffer;
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struct InflateOutput out;
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while (remainingInput > 0 && spaceInOutput > 0) {
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in_bytes = remainingInput;
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out_bytes = spaceInOutput;
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//Call decompression
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status = tinfl_decompress(
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&inflator,
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(const mz_uint8 *)comprBufferNext,
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&in_bytes,
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uncomprBuffer,
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(mz_uint8 *)uncomprBufferNext,
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&out_bytes,
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(hasMoreBytes ? TINFL_FLAG_HAS_MORE_INPUT : 0)
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);
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//Adjust buffer positions by the amount of bytes processed
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comprBufferNext += in_bytes;
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remainingInput -= in_bytes;
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uncomprBufferNext += out_bytes;
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spaceInOutput -= out_bytes;
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//Check for errors
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if (status <= TINFL_STATUS_DONE) {
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if (status == TINFL_STATUS_DONE) {
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// Decompression completed successfully.
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break;
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} else {
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// Decompression failed.
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fprintf(stderr, "tinfl_decompress() failed with status %i!\n", status);
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exit(1);
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}
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}
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//If output buffer is filled
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if (spaceInOutput == 0) {
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break;
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}
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}
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//Return output
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if (remainingInput == 0) {
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out.needMoreInput = hasMoreBytes;
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}
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out.numBytesWrittenToOutput = uncomprBufferSize - spaceInOutput;
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return out;
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}
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