57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
#include "Precomp.h"
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#include "7zMemBuffer.h"
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#include <memory.h>
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WRes MemBuffer_Read(CSzMemBuffer* p, void* data, size_t* size)
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{
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size_t originalSize = *size;
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if (originalSize == 0)
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return 0;
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size_t length = (size_t)(p->pos + (Int64)(*size) > p->size ? p->size - p->pos - 1 : *size);
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memcpy(data, (char*)(p->buffer) + p->pos, length);
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p->pos += length;
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return 0;
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}
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WRes MemBuffer_Seek(CSzMemBuffer* p, Int64* pos, ESzSeek origin)
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{
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switch (origin)
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{
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case SZ_SEEK_SET: p->pos = 0 + *pos;
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break;
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case SZ_SEEK_CUR: p->pos += *pos;
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break;
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case SZ_SEEK_END: p->pos = p->size - *pos;
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break;
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default: return 1;
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}
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*pos = p->pos;
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return 0;
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}
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static SRes MemBufferInStream_Read(void* pp, void* buf, size_t* size)
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{
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CMemBufferInStream* p = (CMemBufferInStream*)pp;
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return (MemBuffer_Read(&p->buffer, buf, size) == 0) ? SZ_OK : SZ_ERROR_READ;
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}
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static SRes MemBufferInStream_Seek(void* pp, Int64* pos, ESzSeek origin)
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{
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CMemBufferInStream* p = (CMemBufferInStream*)pp;
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return MemBuffer_Seek(&p->buffer, pos, origin);
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}
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void MemBufferInit(CMemBufferInStream* memBuferStream, CLookToRead* lookStream, void* buffer, size_t size)
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{
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memBuferStream->buffer.buffer = buffer;
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memBuferStream->buffer.pos = 0;
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memBuferStream->buffer.size = size;
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memBuferStream->s.Read = MemBufferInStream_Read;
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memBuferStream->s.Seek = MemBufferInStream_Seek;
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LookToRead_CreateVTable(lookStream, False);
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lookStream->realStream = &memBuferStream->s;
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LookToRead_Init(lookStream);
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}
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