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///////////////////////////////////////////////////////////////////////////////
//
/// \file vli_encoder.c
/// \brief Encodes variable-length integers
//
// Copyright (C) 2007-2008 Lasse Collin
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
///////////////////////////////////////////////////////////////////////////////
#include "common.h"
extern LZMA_API lzma_ret
lzma_vli_encode(lzma_vli vli, size_t *restrict vli_pos,
uint8_t *restrict out, size_t *restrict out_pos,
size_t out_size)
{
// If we haven't been given vli_pos, work in single-call mode.
size_t vli_pos_internal = 0;
if (vli_pos == NULL)
vli_pos = &vli_pos_internal;
// Validate the arguments.
if (*vli_pos >= LZMA_VLI_BYTES_MAX || *out_pos >= out_size
|| vli > LZMA_VLI_VALUE_MAX)
return LZMA_PROG_ERROR;
// Write the non-last bytes in a loop.
while ((vli >> (*vli_pos * 7)) >= 0x80) {
out[*out_pos] = (uint8_t)(vli >> (*vli_pos * 7)) | 0x80;
++*vli_pos;
assert(*vli_pos < LZMA_VLI_BYTES_MAX);
if (++*out_pos == out_size)
return vli_pos == &vli_pos_internal
? LZMA_PROG_ERROR : LZMA_OK;
}
// Write the last byte.
out[*out_pos] = (uint8_t)(vli >> (*vli_pos * 7));
++*out_pos;
++*vli_pos;
return vli_pos == &vli_pos_internal ? LZMA_OK : LZMA_STREAM_END;
}
extern LZMA_API uint32_t
lzma_vli_size(lzma_vli vli)
{
if (vli > LZMA_VLI_VALUE_MAX)
return 0;
uint32_t i = 0;
do {
vli >>= 7;
++i;
} while (vli != 0);
assert(i <= LZMA_VLI_BYTES_MAX);
return i;
}
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