mirror of
https://github.com/d0k3/GodMode9.git
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63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
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#include <stddef.h>
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#include <stdint.h>
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#include "pcx.h"
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// Define __PCX_INVERT_RGB to have the buffer output in BGR24
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#define __PCX_INVERT_RGB
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static inline int PCX_Validate(const PCXHdr *hdr) {
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return (hdr != NULL &&
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hdr->manufacturer == 10 &&
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PCX_Encoding(hdr) == 1 &&
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PCX_PlaneCount(hdr) == 1 &&
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PCX_BitsPerPixel(hdr) == 8) ? 1 : 0;
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}
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int PCX_Decompress(u8 *out_buf, size_t out_maxlen, const u8 *pcx_data, size_t pcx_len) {
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const PCXHdr *pcx = (const PCXHdr*)pcx_data;
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const u8 *pcx_palette, *out_start, *out_end, *pcx_bitmap, *pcx_end;
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int mrk, palind;
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if (PCX_Validate(pcx) == 0 || (size_t) (PCX_BitmapSize(pcx) * 3) > out_maxlen)
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return -1;
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pcx_end = pcx_data + pcx_len - 769;
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out_end = out_buf + out_maxlen;
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out_start = out_buf;
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pcx_bitmap = PCX_Bitmap(pcx);
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pcx_palette = PCX_Palette(pcx, pcx_len);
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while (pcx_bitmap < pcx_end && out_buf < out_end) {
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mrk = *(pcx_bitmap++);
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if (mrk >= 0xC0) {
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mrk -= 0xC0;
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palind = *(pcx_bitmap++) * 3;
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if ((out_buf + mrk) > out_end) {
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// TODO: report the buffer overflow somehow
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return -1;
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}
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} else {
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palind = mrk * 3;
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mrk = 1;
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}
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while (mrk--) {
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#ifdef __PCX_INVERT_RGB
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*(out_buf++) = pcx_palette[palind + 2];
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*(out_buf++) = pcx_palette[palind + 1];
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*(out_buf++) = pcx_palette[palind + 0];
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#else
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*(out_buf++) = pcx_palette[palind + 0];
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*(out_buf++) = pcx_palette[palind + 1];
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*(out_buf++) = pcx_palette[palind + 2];
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#endif
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}
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}
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return (out_buf - out_start);
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}
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